Information
-
Patent Grant
-
6582555
-
Patent Number
6,582,555
-
Date Filed
Monday, November 5, 200122 years ago
-
Date Issued
Tuesday, June 24, 200321 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 162 112
- 162 111
- 162 101
- 162 135
- 427 243
- 427 244
- 427 294
- 427 420
- 118 410
- 118 413
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International Classifications
- B31F112
- D21H1100
- D21H1500
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Abstract
The present invention is a method for uniformly applying a foam to a wet tissue web is provided. Specifically, a foam is first formed from a liquid-based composition and a gas, such as air. Once formed, the foam is applied by a foam applicator to the wet tissue web. In one embodiment, for example, the foam applicator applies the foam with a flexible scraper contacting the wet tissue web during the application of the foam. When applied with the foam, the wet tissue web typically has a solids consistency less than about 95% by dry weight of the tissue web. In some embodiments, one or more vacuum slots may be utilized in conjunction with the foam applicator to facilitate uniform application of the foam to the wet tissue web.
Description
BACKGROUND OF THE INVENTION
Consumers use tissue products for a wide variety of applications. For example, various types of tissue products may be used, such as facial tissues, bath tissues, paper towels, napkins, wipes, etc. In many instances, various types of liquid-based compositions, such as softening compositions, lotions, friction reducing agents, adhesives, strength agents, etc., are also applied to one or tissue webs of the tissue product. For example, a tissue web is often softened through the application of a chemical additive (i.e., softener). However, one problem associated with some liquid-based compositions is the relative difficulty in uniformly applying the composition to the tissue web of the tissue product. Moreover, many application methods are relatively inefficient and thus may result in substantial waste of the composition being applied.
For instance, many softeners are made as an emulsion containing a particular solids content in solution. However, such liquid-based compositions are often difficult to adequately apply to a tissue web. In particular, when applying such a liquid-based composition, the tissue web can become undesirably saturated, thereby requiring the tissue web to be dried. Moreover, it is also difficult to uniformly spread the liquid-based composition on a tissue web in such a manner to provide adequate surface area coverage. In addition, some softeners contain components that cause the liquid-based composition to be formed as a solid or semi-solid. To facilitate application of these liquid-based compositions onto a tissue product, extensive heating may be required. Moreover, even after extensive heating, it may nevertheless be difficult to uniformly apply the composition to the tissue surface.
As such, a need currently exists for an improved method of applying a liquid-based composition to a tissue web.
SUMMARY OF THE INVENTION
In accordance with one embodiment of the present invention, a method is provided for a more uniform application of applying a liquid-based composition to a tissue web which may have a basis weight less than about 120 grams per square meter. The method comprises providing a papermaking furnish containing cellulosic fibers and forming a tissue web from the papermaking furnish.
In addition, the method also includes applying a foam formed from a liquid-based composition to the tissue web while the tissue web has a solids consistency equal to or less than about 100% by dry weight of the tissue web. In some embodiments, for example, the foam is applied to the tissue web while the tissue web has a solids consistency between about 60% to about 95% by dry weight of the tissue web, and more specifically, between about 80% to about 90% by dry weight of the tissue web. In other embodiments, the foam is applied to the tissue web while the tissue web has a solids consistency between about 10% to about 35% by dry weight of the tissue web, and more specifically, between about 15% to about 30% by dry weight of the tissue web.
In other embodiments, the foam is applied to the tissue web while the tissue web has a solids consistency between about 30% to about 70% by dry weight of the tissue web, more specifically, between about 35% to about 60% by dry weight of the tissue web, and most specifically, between about 40% to about 55% by dry weight of the tissue web. In some instances of the present invention, the foam is applied to a dry or over-dried tissue web having a solids consistency equal to or greater than about 95%, more specifically equal to or greater than about 97%, more specifically equal to or greater than about 98%, and more specifically equal to or greater than 99%.
The method also includes applying a foam to a wet tissue web using an extrusion head of a foam applicator wherein the extrusion head includes a flexible scraper. The flexible scraper assists in the provision of a more uniform distribution of the foam on the wet tissue web.
In other embodiments, the method also includes applying a foam to a dry tissue web using an extrusion head of a foam applicator wherein the extrusion head includes a flexible scraper. The flexible scraper assists in the provision of a more uniform distribution of the foam on the dry tissue web.
The foam may generally be applied to the tissue web in a variety of ways. For instance, in one embodiment, the foam may be drawn toward the tissue web with a vacuum slot. Further, in some embodiments, the tissue web may be supported on a first moving foraminous surface that defines a nip with a second moving foraminous surface such that the foam is applied to the tissue web at the nip.
Other features and aspects of the present invention are described in more detail below.
BRIEF DESCRIPTION OF THE DRAWINGS
A full and enabling disclosure of the present invention, including the best mode thereof to one of ordinary skill in the art, is set forth more particularly in the remainder of the specification, including reference to the accompanying figures in which:
FIG. 1
is a schematic flow diagram of one embodiment of the present invention for forming a tissue web.
FIG. 2
is a perspective view of a foam applicator that may be used to apply foam to a tissue web in accordance with one embodiment of the present invention.
FIG. 3
is a cross-section of a foam applicator that may be used to apply foam to a tissue web in accordance with one embodiment of the present invention.
FIG. 3
a
is a cross-section of a foam applicator that may be used to apply foam to a tissue web in accordance with another embodiment of the present invention.
FIG. 3
b
is a cross-section of a foam applicator that may be used to apply foam to a tissue web in accordance with another embodiment of the present invention.
FIG. 4
is a perspective view of one embodiment of top and bottom foam applicators used to foam a composition onto a tissue in accordance with the present invention.
Repeat use of reference characters in the present specification and drawings is intended to represent same or analogous features or elements of the present invention.
DETAILED DESCRIPTION OF REPRESENTATIVE EMBODIMENTS
Reference now will be made in detail to the embodiments of the invention, one or more examples of which are set forth below. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention cover such modifications and variations as come within the scope of the appended claims and their equivalents.
In general, the present invention is directed to a method for applying a liquid-based composition to a tissue web of a tissue product. In particular, the method of the present invention involves applying the liquid-based composition as a foam during the papermaking process to promote uniform application and to enhance efficiency. As used herein, the term “foam” generally refers to a porous matrix, which is an aggregate of hollow cells or bubbles, the walls of which contain liquid material. The cells may be interconnected to form channels or capillaries within the foam structure wherein such channels or capillaries facilitate liquid distribution within the foam.
A “liquid-based” composition may be foamed onto the tissue web. As used herein, a liquid-based composition generally refers to any composition that is capable of existing in a liquid state. In particular, a liquid-based composition may exist naturally in a liquid state, or may require liquid-enhancing aids, such as heating, foaming aids (e.g., surfactants), etc., to achieve such a liquid state. Moreover, a “liquid-based” composition also includes emulsions having a certain solids content. Some examples of liquid-based compositions that may be applied to a tissue web may include, but are not limited to, softening agents, wet-strength agents, binders, adhesives, friction-reducing agents, and the like.
Besides the components mentioned above, a variety of other materials may also be utilized in conjunction with a liquid-based composition that is foamed onto a tissue web in accordance with the present invention. In fact, any material may be added to the liquid-based composition as long as the material does not substantially affect the ability of the liquid-based composition to be formed into a foam. In particular, a liquid-based composition may often act as an effective carrier for various active ingredients desired to be applied to a tissue web.
For example, in one embodiment, a variety of foaming aids may be applied to the liquid-based composition. Foaming aids may be useful in facilitating the generation of foam. A foaming aid may also be useful in stabilizing existing foam. In general, any of a variety of foaming aids may be applied to the liquid-based composition. In particular, foaming aids that have a low critical miscelle concentration, are cationic and/or amphoteric, and have small bubble sizes are typically utilized. Some examples of suitable foaming aids include, but are not limited to, fatty acid amines, amides, and/or amine oxides; fatty acid quaternary compounds; electrolytes (to help achieve foam stability); and the like. Some commercially available foaming aids that are suitable in the present invention are Mackernium 516 and Mackam 2C made by McIntyre Group, Ltd. When utilized, the foaming aids are generally incorporated into the liquid-based composition in amounts up to about 20% by weight of the liquid-based composition, and in some embodiments, between about 2% by weight to about 15% by weight. Other suitable foaming aids are described in U.S. Pat. No. 4,581,254 issued to Cunningham et al., which is incorporated herein in its entirety by reference thereto for all purposes (hereinafter referred to as the “Cunningham et al. reference”).
Still other examples of suitable materials that may be added to a liquid-based composition for application to a tissue web are disclosed in U.S. Pat. No. 5,869,075 issued to Krzysik, which is incorporated herein in its entirety by reference for all purposes. For instance, some of such materials include, but are not limited to: anti-microbial agents; odor absorbers; masking fragrances; anti-septic actives; anti-oxidants; astringents—cosmetic (induce a tightening or tingling sensation on skin); astringent—drug (a drug product which checks oozing, discharge, or bleeding when applied to skin or mucous membrane and works by coagulating protein); biological additives (enhance the performance or consumer appeal of the product); colorants (impart color to the product); emollients (help to maintain the soft, smooth, and pliable appearance of the skin by their ability to remain on the skin surface or in the stratum corneum to act as lubricants, to reduce flaking, and to improve the skin's appearance); external analgesics (a topically applied drug that has a topical analgesic, anesthetic, or antipruritic effect by depressing cutaneous sensory receptors, of that has a topical counterirritant effect by stimulating cutaneous sensory receptors); film formers (to hold active ingredients on the skin by producing a continuous film on skin upon drying);humectants (increase the water content of the top layers of the skin); natural moisturizing agents (NMF) and other skin moisturizing ingredients known in the art; opacifiers (reduce the clarity or transparent appearance of the product); skin conditioning agents; skin exfoliating agents (ingredients that increase the rate of skin cell turnover such as alpha hydroxy acids and beta hydroxyacids); skin protectants (a drug product which protects injured or exposed skin or mucous membrane surface from harmful or annoying stimuli); and, the like.
In addition, the liquid-based composition may be formed into a foam according to any foam-forming technique known in the art. For instance, in one embodiment, a liquid-based composition may be metered to a foaming system where it may be combined with a gas, such as compressed air, in various proportions. For example, to ensure that the resulting foam is generally stable, the ratio of air volume to liquid volume in the foam (i.e., blow ratio) may be greater than about 3:1, and in some embodiments between about 5:1 to about 180:1. In some embodiments, a blow ratio between about 150:1 to about 180:1 is utilized, while in other embodiments, a blow ratio between about 15:1 to about 25:1 is utilized. For instance, in one embodiment, a blow ratio of about 30:1 may be obtained from a liquid flow rate of 113 grams per minute and an air flow rate of 3400 cubic centimeters per minute. In another embodiment, a blow ratio of about 20:1 may be obtained from a liquid flow rate of 240 grams per minute and an air flow rate of 4800 cubic centimeters per minute.
Within the foaming system, a foam generator may combine the air and the liquid-based composition at a certain energy so that a foam may form. In one embodiment, for example, the foam generator rotates at a certain speed so as to cause the liquid-based composition to pass through a series of edges, which allow trailing eddy currents of air to entrain into the liquid-based composition. In particular, the foam generator may operate at speeds from about 300 revolutions per minute (rpm) to about 700 rpm, and more particularly from about 400 rpm to about 600 rpm. For example, suitable foam generators are described in U.S. Pat. No. 4,237,818 issued to Clifford et al., which is incorporated herein in its entirety by reference thereto for all purposes (hereinafter referred to at the “Clifford et al. reference”). Moreover, one commercially available foam generator that may be utilized in the present invention may be obtained from Gaston Systems, located in Stanley, N.C.
The characteristics of the resulting foam may vary, depending on the parameters of the foam generator utilized, the ratio of the volume of gas to the volume of the liquid-based composition, etc. For instance, in some embodiments, the foam may have a “half-life” that allows the foam to travel from the foam generator to an applicator before degenerating. In some embodiments, a foam bubble may have a half-life of greater than about 3 minutes, more specifically, from about 3 minutes to about 30 minutes, and most specifically, from about 15 minutes to about 25 minutes.
The half-life of the foam may generally be determined in the following manner. A calibrated beaker is positioned on a scale and placed under a 500 cubic centimeter separator funnel. Approximately 50 grams of a foam sample is then collected into the separator funnel. As soon as all of the foam is placed in the funnel, a standard stop watch is started. When approximately 25 grams of liquid collects into the calibrated beaker, the time is stopped and recorded. This recorded time is the foam half-life.
In some instances, the average cell size, wall thickness, and/or density may also foster the stability of the foam. For instance, the foam may have a size, thickness, or density such as described in U.S. Pat. No. 4,099,913 issued to Walter et al. and U.S. Pat. No. 5,985,434 issued to Qin et al., which are both incorporated herein in their entirety by reference thereto for all purposes. For example, in one embodiment, the average cell size of the foam cell may be between about 10 microns to about 100 microns. Moreover, the average wall thickness of the foam cell may be between about 0.1 micron to about 30 microns.
After generation, the foam is then forced out of the foam generator, where it may travel via one or more conduits to a foam applicator to be applied to a tissue web. The diameter of the conduits, the length of the conduits, the pressure of the foam bubbles after exiting the foam generator, and the like, may all be controlled to vary the nature of foam application. For instance, in one embodiment, a conduit having an inner diameter between about 0.375 inches to about 1.5 inches may be utilized to process about 300 to about 3000 cubic centimeters of air per minute and about 20 to about 300 grams of liquid per minute. Moreover, in one embodiment, the length of the conduit may be about 50 feet in length. In addition, upon exiting the foam generator, the pressure of the foam bubbles may be from about 5 psi to about 90 psi, and more particularly from about 30 psi to about 60 psi.
As stated, once the foam exits the foam generator, it may then be supplied to a foam applicator. In general, any foam applicator that is capable of applying a foam, such as described above, onto a tissue web having a solids consistency that is equal to or less than about 100% by dry weight of the tissue web may be used in the present invention. Although not required, in some embodiments, due to the relative wetness of the tissue web being applied with foam, it is also desired that the foam applicator be capable of applying foam without substantially contacting the surface of the tissue web during foam application. For instance, in some instances, the foam applicator may be positioned less than about 2 inches from the upper surface of the tissue web, and in some instances, less than about 1 inch from the upper surface of the tissue web. The foam applicator may be positioned about ½ inch from the upper surface of the tissue web, more specifically about ¼ inch from the upper surface of the tissue web, and most specifically about ⅛ inch from the upper surface of the tissue web.
As used herein, the term ‘lower surface’ of the tissue web is understood to mean the fabric side of the tissue web, that is the side of the tissue web that is in contact with the forming fabric during the formation of the tissue web. As used herein, the term ‘upper surface’ of the tissue web is understood to mean the air side of the tissue web, that is the side of the tissue web that was not in contact with the forming fabric during the formation of the tissue web.
One particular example of a foam applicator
40
that may be used in the present invention is shown in FIG.
2
. As depicted, the foam applicator
40
includes a distribution chamber
42
and an extrusion head
44
. The distribution chamber
42
may generally have any desired shape, size, and/or dimension. For instance, the distribution chamber
42
shown in
FIG. 2
has a parabolic shape. Other examples of suitable distribution chambers are described in the Clifford et al. reference. Moreover, it should also be understood that any method or apparatus for applying a foam to a tissue web may be used in the present invention, and that the foam applicator
40
depicted and described herein is for illustrative purposes only.
As the foam enters the distribution chamber
42
from a conduit
46
, it is initially forced upward to assure that any decaying foam collects therein for automatic draining. Thereafter, it is forced downward, as indicated by the arrows in
FIG. 2
, through the distribution chamber
42
to the extrusion head
44
. In general, extrusion heads having any of a variety of shapes and sizes may be used in the present invention. In the preferred embodiment of the present invention, a “straight slot” extrusion head, such as described in the Clifford, et al. reference and the Cunnigham, et al. reference, is utilized. As used herein, the straight slot extrusion head generally refers to an extrusion head generally
44
having parallel nozzle bars
48
and
50
. In one embodiment, the straight slot extrusion head
44
includes two parallel nozzle bars, a first nozzle bar
48
and a second nozzle bar
50
, that form an extrusion slot
52
which is generally between about 0.025 inches to about 0.5625 inches in width, and in some embodiments, between about 0.050 inches to about 0.0626 inches in width. For instance, in one embodiment, the width of the extrusion slot
52
is about 0.13 inches. In another embodiment, the width of the extrusion slot
52
is about 0.05 inches.
Moreover, the length of the first and second nozzle bars
48
and
50
are typically such that the extrusion slot
52
has a length from about 0.125 inches to about 6 inches in the cross direction. The length of the extrusion slot
52
, however, may be varied as desired to adjust the tissue web handling land area. For example, in one embodiment, the length of the extrusion slot
52
may be about 0.187 inches.
The first nozzle bar
48
of the extrusion head
44
includes a flexible scraper
54
having a lower surface
69
adjacent the wet tissue web
15
(or in some cases, the dried tissue web
16
) and an opposing upper surface
68
. The first end
56
of the flexible scraper
54
may be attached to the outer surface
66
of the extrusion head
44
, to the inner surface
60
of the first nozzle bar
48
, or to the outer surface
62
of the first nozzle bar
48
. (See
FIGS. 3
,
3
a
, and
3
b
.) The second end
64
of the flexible scraper
54
extends beyond the first nozzle bar
48
. It is understood that the flexible scraper
54
may be attached to the extrusion head
44
in any configuration to achieve the positioning of the second end
64
as shown in
FIGS. 3
,
3
a
, and
3
b
. It is understood that the discussion relating to the treatment of the wet tissue web
15
is equally applicable to the treatment of the dried tissue web
16
.
The length of flexible scraper
54
extends beyond the first nozzle bar
48
by at least the distance equal to the distance between the extrusion head
44
and the wet tissue web
15
. Generally, the length of the flexible scraper
54
extending beyond the first nozzle bar
48
by a distance that is between about {fraction (1/16)} inch to about 1 inch longer than the distance between the extrusion head
44
and the upper surface of the wet tissue web
15
, and in some embodiments, between about ⅛ inch to 1 inch in length longer than the distance between the extrusion head
44
and the upper surface of the wet tissue web
15
. According to other embodiments of the present invention, the length of the flexible scraper
54
extending beyond the first nozzle bar
48
by a distance between about ⅛ inch to about ½ inch longer than the distance between the extrusion head
44
and the upper surface of the wet tissue web
15
, and more specifically between about ¼ inch to about ½ inch longer than the distance between the extrusion head
44
and the upper surface of the wet tissue web
15
.
For instance, in one embodiment, the length of the flexible scraper
54
extending beyond the extrusion head
44
is about ½ inch longer than the distance between the extrusion head
44
and the upper surface of the wet tissue web
15
. In another embodiment, the length of the flexible scraper
54
extending beyond the extrusion head
44
is about ¼ inch longer than the distance between the extrusion head
44
and the upper surface of the wet tissue web
15
. The distance between the extrusion head
44
and the moving wet tissue web
15
and the length of the flexible scraper
54
that extends beyond the first nozzle bar
48
may be adjusted to ensure an optimum benefit of the flexible scraper
54
.
The flexible scraper
54
may be made out of any of the following materials: mylar; plastic; rubber; metal; resin; teflon; and, any other material known in the art which is flexible, durable, and liquid impermeable. In various embodiments, the flexible scraper
54
has a thickness of between about 0.003 inch to about 0.015 inch, and in some embodiments, between about 0.005 inch to about 0.015 inch. According to another embodiment of the present invention, the flexible scraper
54
has a thickness of between about 0.005 inch to about 0.010 inch. For instance, in one embodiment, the thickness of the flexible scraper
54
is about 0.003 inch. In another embodiment, the thickness of the flexible scraper
54
is about 0.005 inch.
In accordance with this configuration, the second end
64
of the flexible scraper
54
is in contact with and, in some cases, deforms into a bent configuration by the higher points of the surface of the moving wet tissue web
15
. The foam flows down the lower surface
69
of the flexible scraper
54
where the foam is deposited onto the wet tissue web
15
(or in some cases, the dried tissue web
16
). The second end
64
causes the foam, thus the composition, to be more uniformly distributed over the surface of the wet tissue web
15
from the extrusion head
44
. The foam may be distributed into the lower points as well as the higher points of the surface of the moving wet tissue web
15
. The foam, using the teachings of the present invention, may be formulated and distributed so as to deposit the foam on the higher points of the moving wet web
15
. In other embodiments of the present invention, the foam may be distributed in the lower points of the moving wet web
15
.
Many factors may affect operation of the foam applicator
40
. The performance of the flexible scraper
54
may be enhanced by the optimization of these factors. For example, various attributes of the flexible scraper
54
, such as the thickness of the flexible scraper
54
, the length of the flexible scraper
54
, the materials making up the flexible scraper
54
, and/or the stiffness of the flexible scraper
54
, may be adjusted or otherwise chosen to affect the operation of the foam applicator
40
. The foam applicator
40
needs to be able to apply the foam to the wet tissue web
15
while the flexible scraper
54
applies with enough force to disrupt or disintegrate the foam and distribute the foam or liquid-based composition over the wet tissue web
15
without disturbing or damaging the wet tissue web
15
. At the same time, the foam applicator
40
must provide a uniform application of the foam onto the wet tissue web
15
.
The characteristics of the liquid-based composition, the foam, and/or the wet tissue web
15
may also affect the operation of the foam applicator
40
. It may be desirable to manipulate various attributes or the components of the liquid-based composition, the foam, and/or the wet tissue web
15
to enhance or otherwise alter the operation of the foam applicator
40
. Additionally, the speed of the papermaking machine, the flow rate of the foam, the topography of the wet tissue web
15
, the moisture content of the wet tissue web
15
, the integrity the wet tissue web
15
, the physical configuration of the extrusion head
44
or other portions of the foam applicator
40
may also be adjusted or otherwise chosen to affect the operation of the foam applicator
40
.
In situations where the chemical add-on of the liquid-based composition is not excessive, typically less than about 10% of the basis weight of the dried tissue web
16
, the application of the foam using standard foam applicators may have a tendency to contact, thereby coating, only a portion of the higher points, including such areas as the ridges or protuberances, in the surface of the wet tissue web
15
. This can result in little or no chemical treatment of the composition reaching the low points, including such areas as the valleys or recesses, in the surface of the wet tissue web
15
. In many instances, a uniform application of the foam to the higher points of the wet tissue web
15
is not achieved using standard foam applicators.
In some embodiments of the present invention, preferential treatment of the wet tissue web
15
may be accomplished using the extrusion head
44
, providing a dried tissue web
16
having the desired improved properties using a reduced amount of the liquid-based composition. The flexible scraper
54
may be adjusted so that the foam contacts only the high points of the surface of the wet tissue web
15
, providing a dried tissue web
16
having the desired improved properties while providing a more efficient use of composition. Such an application of the foam could be particularly advantageous in tissue products having multiple level surfaces such as rippled or embossed surfaces. It is understood that the discussion of the foam application via the applicator
40
pertaining to a wet tissue web
15
is equally applicable to a dried tissue web
16
.
In accordance with the present invention, as shown in
FIG. 3
, the foam applicator
40
, such as described above, may be positioned at a variety of locations within a papermaking process to apply foam to a wet tissue web
15
. However, although the location of the foam applicator
40
is not critical, it is typically desired that the foam applicator
40
be positioned such that foam is applied when the wet tissue web
15
has a solids consistency less than about 95% by dry weight of the wet tissue web
15
, and in some embodiments, less than about 90% by dry weight of the wet tissue web
15
.
In embodiments where the wet tissue web
15
is not supported by a fabric, it may be desirable to provide an optional fabric that is more rigid than the wet tissue web
15
to carry the wet tissue web
15
at the time of the foam application. The optional fabric may ensure a more constant distance between the extrusion head
44
and the wet tissue web
15
, thereby providing a more consistent application of the foam. An optional web handling vacuum slot
32
may be utilized to more firmly hold the wet tissue web
15
on a fabric during the application of the foam to the wet tissue web
15
.
The optional web handling vacuum slot
32
may be positioned to extend across the full width of the wet tissue web
15
. In other embodiment so the present invention, the web handling vacuum slot
32
may be positioned along one or both edges of the wet tissue web
15
. The length of the web handling vacuum slot
32
positioned along each edge of the wet tissue web
15
is between about 3 inches and about 24 inches, more specifically of a length of between about 6 inches and about 18 inches, and most specifically of a length of between about 9 inches and about 18 inches. For instance, in one embodiment, the length of the web handling vacuum slot
32
positioned along at least one edge of the wet tissue web
15
is about 18 inches. In another embodiment, the length of the web handling vacuum slot
32
positioned along at least one edge of the wet tissue web
15
is about 12 inches.
The web handling vacuum slot
32
, as discussed below regarding the vacuum slot
28
, may generally be formed by a variety of devices that are capable of applying a negative pressure on the wet tissue web
15
, such as vacuum boxes, vacuum shoes, vacuum rolls, foils, or any other method known in the art. The web handling vacuum slot
32
may have a slot opening width between about 1 inch and about ⅛ inch, more specifically a width between about ¾ inch and about ¼ inch, and most specifically a width between about ¾ inch and about ½ inch. For instance, in one embodiment, the web handling vacuum slot
32
has a slot opening width of about ½ inch. In another embodiment, the web handling vacuum slot
32
has a slot opening width of about ¾ inch.
The web handling vacuum slot
32
may be utilized to reduce the “boundary air layer” surrounding the wet tissue web
15
. As used herein, a “boundary air layer” generally refers to a layer of air that is entrained by a moving fabric or tissue web supported on a fabric. Boundary air layers may be present at any speed at which a tissue machine is operated, including speeds of about 1,000 feet per minute, about 2,000 feet per minute, and 3,000 feet per minute or greater. For example, boundary air layers often occur at high linear speeds, such as at speeds above about 4,000 feet per minute, and in some embodiments, between about 4,000 feet per minute to about 6,000 feet per minute. Boundary air layers may sometimes disrupt foam application. As such, it is typically desired to minimize the boundary air layer to enhance the efficiency of foam application. In one embodiment, for example, the web handling vacuum slot
32
may be upstream from the foam applicator
40
to help minimize the boundary air layer. Further, various other mechanisms may also be utilized to minimize the boundary air layer, such as using deflecting mechanisms. Moreover, it should be understood that it may not be necessary to reduce the boundary air layer in all circumstances when applying a foam to a wet tissue web
15
in accordance with the present invention.
A vacuum slot
70
may be positioned to extend across the full width of the wet tissue web
15
in the cross direction of the wet tissue web
15
below the foam applicator
40
. It is understood that the vacuum slot
70
may be one continuous vacuum slot or made up of multiple vacuum slots positioned across the CD direction of the wet tissue web
15
. It is also understood that the length of the vacuum slot
70
in the CD direction may be of any value less than the CD width of the wet tissue web
15
. The vacuum slot
70
, as discussed above regarding the web handling vacuum slot
32
, may generally be formed by a variety of devices that are capable of applying a negative pressure on the wet tissue web
15
, such as vacuum boxes, vacuum shoes, vacuum rolls, foils, or any other method known in the art. The vacuum slot
70
may have a slot opening width between about 1 inch and about ⅛ inch, more specifically a width between about ¾ inch and about ¼ inch, and most specifically a width between about ¾ inch and about ½ inch. For instance, in one embodiment, the vacuum slot
70
has a slot opening width of about ½ inch. In another embodiment, the vacuum slot
70
has a slot opening width of about ¾ inch.
Although not required, the vacuum slot
70
may aid in drawing the foam toward or into the wet tissue web
15
. For instance, once formed, the foam bubbles generally remain under pressure until the instant of application to the wet tissue web
15
by the foam applicator
40
so that the liquid forming the bubbles may be blown onto the wet tissue web
15
by airlet(s) and/or nozzle(s) of the foam applicator
40
. As shown in
FIG. 3
, a vacuum slot
70
may draw these foam bubbles towards the wet tissue web
15
, thereby facilitating the application of the foam onto or into the wet tissue web
15
. It should be understood that other vacuum slot(s) located in various positions may be utilized in the present invention. Moreover, it should also be understood that a vacuum slot is not required to apply foam to the wet tissue web
15
.
The vacuum slot
70
may also be utilized to reduce the boundary air layer surrounding the wet tissue web
15
. In addition, the vacuum slot
70
assists with the deposition of the foam onto the wet tissue web
15
. The vacuum slot
70
also aids in the removal of the air that is entrained within the foam.
In some embodiments of the present invention, the vacuum slot
70
may be positioned such that the front edge
71
of the vacuum slot
70
extends beyond the second end
64
of the flexible scraper
54
in the machine direction where the second end
64
is positioned on the wet tissue web
15
. When placed in such a position, the vacuum slot
70
is able to also provide a cleaning function to the upper surface
68
of the flexible scraper
54
. During use of the flexible scraper
54
, dust and other matter may collect on the upper surface
68
of the flexible scraper
54
, thereby interfering with the operation of the flexible scraper
54
and the application of the foam to the wet tissue web
15
. The vacuum slot
70
with at least the front edge
71
positioned beyond the second end
64
of the flexible scraper
54
in the machine direction draws air from above the upper surface
68
of the flexible scraper
54
down over the upper surface
68
and through the wet tissue web
15
, thereby removing the matter that may have settled on the upper surface
68
. The front edge
71
of the vacuum slot
70
extends beyond the second end
64
of the flexible scraper
54
in the machine direction by a distance of between about 1 inch to about ⅛ inch, more specifically a distance of between about ¾ inch to about ¼ inch, and most specifically a distance of between about ¾ inch to about ½ inch. For instance, in one embodiment, the front edge
71
of the vacuum slot
70
extends beyond the second end
64
of the flexible scraper
54
in the machine direction by a distance of about ¾ inch. In another embodiment, the front edge
71
of the vacuum slot
70
extends beyond the second end
64
of the flexible scraper
54
in the machine direction by a distance of about ½ inch.
In some instances, the back edge
72
of the vacuum slot
70
is positioned within about 1 inch in front of to about 1 inch beyond (in the machine direction) the second end
64
of the flexible scraper
54
. The range of the distance of the back edge
72
of the vacuum slot
70
may be from about ¾ inch to about 0 inch in front of or beyond the second end
64
of the flexible scraper
54
, more specifically a distance of between about ¾ inch to about ⅛ inch, and most specifically a distance of between about ¾ inch to about ¼ inch. For instance, in one embodiment, the back edge
72
of the vacuum slot
70
may be adjusted to a distance of about ¾ inch in front of or beyond the second end
64
of the flexible scraper
54
. In another embodiment, the back edge
72
of the vacuum slot
70
may be adjusted to a distance of about ½ inch in front of or beyond the second end
64
of the flexible scraper
54
.
In general, any type of tissue construction can be applied with a foam composition in accordance with the present invention. For example, the tissue product can be a single or multi-ply tissue. Normally, the basis weight of a tissue product of the present invention is less than about 120 grams per square meter, particularly from about 5 grams per square meter to about 60 grams per square meter, particularly from about 10 grams per square meter to about 55 grams per square meter, and more particularly between about 10 grams per square meter to about 35 grams per square meter. In addition, one or more surfaces of the tissue can be provided with elevated regions (e.g., protrusions, impressions, or domes), such as described in more detail below.
A tissue web that can be used in the present invention can generally be formed by any of a variety of papermaking processes known in the art. In particular, it should be understood that the present invention is not limited to any particular papermaking process. In fact, any process capable of forming a paper or tissue web can be utilized in the present invention. For example, a papermaking process of the present invention can utilize creping, embossing, wet-pressing, through-drying, through-dry creping, uncreped through-drying, double creping, calendering, as well as other steps in forming the tissue product.
In this regard, one embodiment of a papermaking process, including some optional locations for one or more foam applicators
40
, is illustrated in
FIG. 1
as
30
,
36
,
38
,
84
,
90
,
92
, and
94
. It is understood that other locations may be used for foam application in accordance with the present invention as well. For simplicity, the various tensioning rolls schematically used to define the several fabric runs are shown but not numbered. In particular, the papermaking process depicted in
FIG. 1
utilizes an uncreped through-drying technique to form the tissue web. Examples of such a technique are disclosed in U.S. Pat. Nos. 5,048,589 issued to Cook et al.; 5,399,412 issued to Sudall et al.; 5,510,001 issued to Hermans et al.; 5,591,309 issued to Rugowski et al.; and, 6,017,417 issued to Wendt et al., which are incorporated herein in their entirety by reference thereto for all purposes. The U.S. Pat. No. 6,017,417 is hereinafter referred to at the “Wendt et al. reference”.
Uncreped through-drying generally involves the steps of: (1) forming a furnish of cellulosic fibers, water, and optionally, other additives; (2) depositing the furnish on a moving foraminous surface (e.g., belt, fabric, wire, etc.), thereby forming a tissue web on top of the moving foraminous surface; (3) subjecting the tissue web to through-drying to remove the water from the tissue web; and, (4) removing the dried tissue web from the moving foraminous surface. However, it should be understood that other variations of the embodiments described herein and other methods for forming a tissue web are equally suitable for use in the present invention. Moreover, it should also be understood that any other process known in the art for forming a tissue web may also be utilized in the present invention. For example, the papermaking process may utilize creping, embossing, wet-pressing, through-drying, through-dry creping, uncreped through-drying, double creping, calendering, as well as other known steps and/or papermaking devices (e.g., Yankee dryers) in forming the tissue web.
In this regard, referring again to
FIG. 1
, a papermaking headbox
10
may be used to inject or deposit a stream
11
of an aqueous suspension onto the forming fabric
12
. The aqueous suspension supplied by the headbox
10
may generally be formed from a variety of materials. In particular, a variety of natural and/or synthetic fibers may be used. For example, some suitable natural fibers may include, but are not limited to, nonwoody fibers, such as abaca, sabai grass, milkweed floss fibers, pineapple leaf fibers; softwood fibers, such as northern and southern softwood kraft fibers; and, hardwood fibers, such as eucalyptus, maple, birch, aspen, and the like. Illustrative examples of other suitable pulps include southern pines, red cedar, hemlock, and black spruce. Exemplary commercially available long pulp fibers suitable for the present invention include those available from Kimberly-Clark Corporation under the trade designations “Longlac-19”. In addition, furnishes including recycled fibers may also be utilized. Moreover, some suitable synthetic fibers may include, but are not limited to, hydrophilic synthetic fibers, such as rayon fibers and ethylene vinyl alcohol copolymer fibers, as well as hydrophobic synthetic fibers, such as polyolefin fibers.
The headbox
10
may be any papermaking headbox used in the art, such as a stratified headbox capable of producing a multilayered tissue web. For example, it may be desirable to provide relatively short or straight fibers in one layer of the tissue web to give a layer with high capillary pressure, while another layer contains relatively longer, bulkier, or more curled fibers for high permeability and high absorbent capacity and high pore volume. It may also be desirable to apply different chemical agents to separate layers of the tissue web to optimize dry and wet strength, pore space, wetting angle, appearance, or other properties of a tissue web. Further, multiple headboxes may be used to create a layered structure, as is known in the art.
As shown, with the aid of a roll
14
, the stream
11
is then transferred from the forming fabric
12
to a drainage fabric
13
, which serves to support and carry the newly-formed wet tissue web
15
downstream in the process as the wet tissue web
15
is partially dewatered to a solids consistency of about 10% by dry weight of the wet tissue web
15
. In some instances, additional dewatering of the wet tissue web
15
may be carried out, such as by a vacuum slot
28
, while the wet tissue web
15
is supported by the drainage fabric
13
.
In accordance with the present invention, a foam applicator
40
may be optionally positioned at a location
30
to supply foam to the wet tissue web
15
as it is carried on the drainage fabric
13
. For example, in some embodiments, the foam applicator
40
may be positioned less than about 2 inches from the upper surface of the wet tissue web
15
, and in some embodiments, less than about 1 inch from the wet tissue web
15
. In this embodiment, the consistency of the wet tissue web
15
being applied with foam is typically between about 10% to about 35%, and in some embodiments, between about 15% to about 30%. Due to the relatively high moisture content of the wet tissue web
15
, the foam applicator
40
may be configured to apply the foam in a manner such that it tends to migrate through the entire wet tissue web
15
. However, it should also be understood that the foam applicator
40
may also be configured to apply the foam primarily onto the surface of the wet tissue web
15
.
In some embodiments, a vacuum slot
28
formed, for example, by a vacuum roll, a vacuum box, and/or a vacuum shoe, may also be utilized in conjunction with the foam applicator
40
to aid in applying foam to the wet tissue web
15
. Although not required, vacuum slots
28
may aid in drawing the foam towards or into the wet tissue web
15
as described above regarding the vacuum slot
70
.
The vacuum slot
28
, as stated above, may generally be formed by a variety of devices that are capable of applying a negative pressure on the tissue web, such as vacuum boxes, vacuum shoes, vacuum rolls, foils, and any device know in the art. Moreover, the vacuum slot
28
formed by such devices may have any desired size, dimension, and/or shape desired. For example, in one embodiment, the vacuum slot
28
is formed by parallel bars that are spaced apart approximately 0.50 inches.
Besides being used to aid in foam application, vacuum slots may also be used for a variety of other purposes. For instance, the vacuum slot
28
may also be used to partially dewater the wet tissue web
15
, as is known in the art. However, it should be understood that one or more vacuum slots
28
may be positioned in a variety of other locations to assist in the reduction of a boundary air layer.
Referring again to
FIG. 1
, the wet tissue web
15
is then transferred from the drainage fabric
13
to a transfer fabric
17
that may travel at a slower speed than the drainage fabric
13
in order to impart increased stretch into the wet tissue web
15
. This is commonly referred to as “rush” transfer. One useful method of performing rush transfer is taught in U.S. Pat. No. 5,667,636 issued to Engel et al., which is incorporated herein in its entirety by reference thereto for all purposes. The relative speed difference between the drainage fabric
13
and the transfer fabric
17
may be from 0% to about 80%, in some embodiments from about 10% to about 60%, and in some embodiments, from about 10% to about 40%. The transfer may be carried out with the assistance of a vacuum shoe or roll such that the drainage fabric
13
and the transfer fabric
17
simultaneously converge and diverge at the leading edge of the vacuum slot of the vacuum shoe or roll.
Thereafter, the wet tissue web
15
is transferred from the transfer fabric
17
to a through-drying fabric
19
with the aid of a vacuum transfer roll or shoe. The through-drying fabric
19
may be traveling at about the same speed or a different speed relative to the transfer fabric
17
. For example, if desired, the through-drying fabric
19
may run at a slower speed to further enhance stretch. The vacuum transfer roll or shoe (negative pressure) may be supplemented or replaced by the use of positive pressure from the opposite side of the wet tissue web
15
to blow the wet tissue web
15
onto the next fabric.
In some embodiments, the through-drying fabric
19
may be a smoother fabric, such as Asten 934, 937, 939, 959 or Albany 94M. However, in other embodiments, it may be desired to form elevated regions and depressions into the wet tissue web
15
. To impart such elevated regions, in one embodiment, the through-drying fabric
19
may be a fabric having impression knuckles, such as described in the Wendt et al. reference. For example, when imprinted with elevations, the resulting tissue web can have between about 5 to about 300 protrusions per square inch. Moreover, the protrusions can have a height relative to the plane of the basesheet, as measured in the uncalendered state and uncreped state, of greater than about 0.1 mm, particularly greater than about 0.2 mm, more particularly greater than about 0.3 mm, and in most embodiments, from about 0.25 mm to about 0.6 mm.
Thereafter, a through-dryer
21
may accomplish the removal of moisture from the wet tissue web
15
by passing air through the wet tissue web
15
without applying any mechanical pressure. The through-drying process may also increase the bulk and softness of the wet tissue web
15
. In one embodiment, for example, the through-dryer
21
may contain a rotatable, perforated cylinder and a hood (not shown) for receiving hot air blown through perforations of the cylinder as through-drying fabric
19
carries the wet tissue web
15
over the upper portion of the cylinder. The heated air is forced through the perforations in the cylinder of the through-dryer
21
and removes the remaining water from the wet tissue web
15
. The temperature of the air forced through the wet tissue web
15
by the through-dryer
21
may vary, but is typically from about 300° F. to about 400° F.
While supported by the through-drying fabric
19
, the wet tissue web
15
may then be partially dried by the through-dryer
21
, such as, for example, to a solids consistency of less than about 95% by dry weight of the wet tissue web
15
, in some embodiments to a solids consistency of between about 60% to about 95% by dry weight of the wet tissue web
15
, and in some embodiments, to a solids consistency of between about 80% to about 90% by dry weight of the wet tissue web
15
.
In accordance with the present invention, a foam applicator
40
may optionally be positioned at or near the nip
35
formed by the through-drying fabric
19
and a fabric
23
. For example, in some embodiments, the foam applicator
40
may be positioned less than about 2 inches from the nip
35
, and in some embodiments, less than about 1 inch from the nip
35
. In this embodiment, the solids consistency of the wet tissue web
15
being applied with foam is typically between about 60% to about 95% by dry weight of the wet tissue web
15
, and in some embodiments, between about 80% to about 90%. Due to the relatively high moisture content of the wet tissue web
15
, the foam applicator
40
may be configured to apply the foam in a manner such that it tends to migrate through the entire wet tissue web
15
. However, it should also be understood that the foam applicator
40
may also be configured to apply the foam primarily onto the surface of the wet tissue web
15
.
In some instances, applying foam at a nip formed between two or more moving foraminous surfaces, such as the nip
35
formed between the through-drying fabric
19
and the fabric
23
, may facilitate the uniform application of foam to the wet tissue web
15
. In particular, when two moving surfaces form a nip, such as the nip
35
shown in
FIG. 1
, the motion of the surfaces typically creates an area of suction just above the nip. Thus, by locating a foam applicator
40
near this area of suction, foam dispensed by the applicator
40
is naturally drawn to the nip
35
and onto the wet tissue web
15
passing therethrough. As such, in accordance with the present invention, foam applicators may optionally be located at or near any nip formed by two or more moving foraminous surfaces to facilitate foam application.
Moreover, to further aid in the application of foam to the wet tissue web
15
, a vacuum slot
34
, such as described above, may also be utilized. Besides being used to aid in foam application, vacuum slots may also be used to partially dewater the wet tissue web
15
, to reduce the boundary air layer, etc.
After being dried by the through-dryer
21
and optionally applied with foam at the nip
35
, the wet tissue web
15
is then sandwiched between the through-drying fabric
19
and the fabric
23
to further dewater the wet tissue web
15
. In some instances, another through-dryer
25
may substantially dry the wet tissue web
15
by passing air therethrough without applying any mechanical pressure. For example, in some embodiments, the wet tissue web
15
may be dried to a consistency of about 95% or greater by the through-dryer
21
, thereby forming a dried tissue web
16
. The dried tissue web
16
may be carried on additional fabrics, such as transfer fabrics
86
and
88
as shown in FIG.
1
.
Foam may be applied to the dried tissue web
16
at the location
90
, at location
92
, or at the location
94
. The dried tissue web
16
may then be transferred to a winding reel
96
, or to various off-line processing stations, such as subsequent off-line calendering to improve the smoothness and softness of the dried tissue web
16
. In some instances of the present invention, the foam is applied to a dry or over-dried tissue web
16
having a solids consistency equal to or greater than about 95%, more specifically equal to or greater than about 96%, more specifically equal to or greater than about 97%, more specifically equal to or greater than 98%, and more specifically equal to or greater than about 99%.
In some embodiments of the foam applications of the present invention, the is speed of the wet tissue web
15
and the dried tissue web
16
may be established such that the composition so applied does not dry or set before the dried tissue web
16
is wound on a parent roll or any other roll. The composition may then be partially transferred to the untreated surface of the dried tissue web
16
. A nip may be positioned to assist such a transfer.
Although the use of only one foam applicator
40
is described in detail herein, it should be understood that any number of foam applicators
40
may be used. For instance, as shown in
FIG. 4
, a first foam applicator
40
a
is shown as depositing a foam composition onto the top surface of the wet tissue web
15
, while a second applicator
40
b
is shown as depositing a foam composition on the bottom surface of the wet tissue web
15
. The second foam applicator
40
b
may be the same or different than the first foam applicator
40
a
. Moreover, although not required, it is typically desired that the first and second foam applicators
40
a
and
40
b
be positioned in a staggered configuration so that the wet tissue web
15
can be better deflected around the first and second foam applicators
40
a
and
40
b
. It should also be understood that additional foam applicators
40
may be utilized in conjunction with the first and second applicators
40
a
and
40
b
to deposit foam compositions onto the top and/or bottom surfaces of the wet tissue web
15
.
In other embodiments of the foam applications of the present invention, both surfaces of the wet tissue web
15
may be treated with the composition in accordance with method disclosed herein. Both surfaces of the wet tissue web
15
may be treated with the at substantially the same time or one surface of the wet tissue web
15
may be treated with the composition and then the other surface of the wet tissue web
15
subsequently treated with the composition. In other embodiments of the present invention, one surface of the wet tissue web
15
is treated with one composition and the other surface of the wet tissue web
15
is treated with another composition.
A tissue web formed in accordance with the present invention may generally be formed into a tissue product in a variety of ways. For instance, in some embodiments, the tissue web may be used alone to form the tissue product (i.e., single-ply tissue product). In other embodiments, the tissue web may be utilized in conjunction with one or more other tissue webs to form the tissue product (i.e., multi-ply tissue product). Moreover, a tissue web of an individual ply of a tissue product may contain more than one fibrous layer such that the tissue web is stratified. Normally, the basis weight of the resulting tissue product is less than about 120 grams per square meter, in some embodiments from about 5 grams per square meter to about 70 grams per square meter, and in some embodiments, between about 10 grams per square meter to about 60 grams per square meter.
While the invention has been described in detail with respect to the specific embodiments thereof, it will be appreciated that those skilled in the art, upon attaining an understanding of the foregoing, may readily conceive of alterations to, variations of, and equivalents to these embodiments. Accordingly, the scope of the present invention should be assessed as that of the appended claims and any equivalents thereto.
Claims
- 1. A method of uniformly applying a liquid-based composition to a wet tissue web made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:providing a papermaking furnish containing at least cellulosic fibers; forming a wet tissue web from the papermaking furnish; forming a foam from a liquid-based composition; applying the foam to the wet tissue web while the wet tissue web has a solids consistency less than about 95% by dry weight of the tissue web wherein the foam is applied by an extrusion head of a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the wet tissue web by the flexible scraper.
- 2. The method as defined in claim 1, wherein the foam is applied to the wet tissue web while the wet tissue web has a solids consistency between about 60% to about 95% by dry weight of the tissue web.
- 3. The method as defined in claim 1, wherein the flexible scraper applies sufficient force to the foam to disintegrate the foam.
- 4. The method as defined in claim 1, wherein the flexible scraper is made of materials selected from the group comprising: mylar; plastic; rubber; metal; resin; teflon; and, combinations thereof.
- 5. The method as defined in claim 1, wherein the flexible scraper has a thickness of between about 0.003 inch to about 0.015 inch.
- 6. The method as defined in claim 1, wherein the flexible scraper has a length extending beyond the extrusion head from between about 1 inch to about {fraction (1/16)} inch.
- 7. The method as defined in claim 1, wherein the foam is applied to the wet tissue web while the wet tissue web has a solids consistency between about 10% to about 30% by dry weight of the tissue web.
- 8. The method as defined in claim 1, further comprising drying the wet tissue web thereby forming a dried tissue web.
- 9. The method as defined in claim 8, wherein the drying is accomplished by at least one through-dryer.
- 10. The method as defined in claim 1, wherein the dried tissue web is converted into a tissue product has a basis weight between about 5 to about 70 grams per square meter.
- 11. The method as defined in claim 1, further comprising positioning a vacuum slot having a front edge and a second edge opposite the foam applicator with the wet tissue web therebetween so that the foam is drawn towards the wet tissue web when dispensed from the foam applicator.
- 12. The method as defined in claim 11, wherein the front edge of the vacuum slot extends beyond the second end of the flexible scraper by a distance of at least 1 inch.
- 13. The method as defined in claim 1, wherein a web handling vacuum slot is positioned opposite the foam applicator with the wet tissue web therebetween and upstream of the foam distribution.
- 14. The method as defined in claim 13, wherein the web handling vacuum slot extends across the CD width of the wet tissue web.
- 15. A method of applying a liquid-based composition to a wet tissue web capable of being made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:providing a papermaking furnish containing at least cellulosic fibers; forming a wet tissue web from the papermaking furnish, the wet tissue web having an upper surface and a lower surface opposing the upper surface; forming a foam from a liquid-based composition; positioning a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface adjacent to the upper surface of the wet tissue web wherein the flexible scraper has a first end and a second end and the lower surface of the flexible scraper is in contact with the upper surface of the wet tissue web; furnishing the foam applicator with the foam; dispensing the foam from an extrusion head of the foam applicator onto the wet tissue web while the wet tissue web has a solids consistency less than about 95% by dry weight of the tissue web wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the upper surface of the wet tissue web by the flexible scraper.
- 16. The method as defined in claim 15, wherein the foam is dispensed onto the tissue web while the wet tissue web has a solids consistency between about 60% to about 95% by dry weight of the wet tissue web.
- 17. The method as defined in claim 15, wherein the flexible scraper applies sufficient force to the foam to disintegrate the foam.
- 18. The method as defined in claim 15, wherein the flexible scraper is made of materials selected from the group comprising: mylar; plastic; rubber; metal; resin; teflon; and, combinations thereof.
- 19. The method as defined in claim 15, wherein the foam is dispensed onto the wet tissue web while the tissue web has a solids consistency between about 10% to about 35% by dry weight of the tissue web.
- 20. The method as defined in claim 15, wherein the flexible scraper has a length extending beyond the foam applicator from between about 1 inch to about {fraction (1/16)} inch greater than the distance from the extrusion head to the upper surface of the wet tissue web.
- 21. The method as defined in claim 15, further comprising positioning a vacuum slot adjacent to the lower surface of the wet tissue web so that the foam is drawn towards the wet tissue web when dispensed from the foam applicator wherein the vacuum slot has a front edge and a second edge.
- 22. The method as defined in claim 21, wherein the front edge of the vacuum slot extends beyond the second end of the flexible scraper by a distance of at least 1 inch.
- 23. The method as defined in claim 15, wherein a web handling vacuum slot is positioned opposite the foam applicator with the wet tissue web therebetween and upstream of the foam distribution.
- 24. The method as defined in claim 23, wherein the web handling vacuum slot extends across the CD width of the wet tissue web.
- 25. The method as defined in claim 15, wherein the tissue product has a basis weight between about 5 to about 70 grams per square meter.
- 26. The method as defined in claim 15, further comprising drying the wet tissue web thereby forming a dried tissue web.
- 27. The method as defined in claim 26, wherein the drying is accomplished by at least one through-dryer.
- 28. The method as defined in claim 15, further comprising dispensing foam from an extrusion head of a second foam applicator onto the lower surface of the tissue web.
- 29. A method of applying a liquid-based composition to a wet tissue web capable of being made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:depositing a papermaking furnish containing at least cellulosic fibers and water onto a moving fabric surface, thereby forming a wet tissue web on the moving fabric surface, the wet tissue web having an upper surface and a lower surface opposing the upper surface; forming a foam from a liquid-based composition; positioning a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface adjacent to the upper surface of the wet tissue web wherein the lower surface of the flexible scraper is in contact with the upper surface of the wet tissue web; furnishing the foam applicator with the foam; dispensing the foam from an extrusion head of the foam applicator onto the wet tissue web while the wet tissue web has a solids consistency less than about 95% by dry weight of the wet tissue web wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; distributing the foam on the upper surface of the wet tissue web by the flexible scraper; and, thereafter, drying the wet tissue web to remove water therefrom thereby forming a dried tissue web.
- 30. The method as defined in claim 29, wherein the foam is dispensed onto the wet tissue web while the wet tissue web has a solids consistency between about 60% to about 95% by dry weight of the tissue web.
- 31. The method as defined in claim 29, wherein the flexible scraper applies sufficient force to the foam to disintegrate the foam.
- 32. The method as defined in claim 29, wherein the flexible scraper is made of materials selected from the group comprising: mylar; plastic; rubber; metal; resin; teflon; and, combinations thereof.
- 33. The method as defined in claim 29, wherein the foam is dispensed onto the wet tissue web while the wet tissue web has a solids consistency between about 10% to about 35% by dry weight of the tissue web.
- 34. The method as defined in claim 29, wherein a web handling vacuum slot is positioned opposite the foam applicator with the wet tissue web therebetween and upstream of the foam distribution.
- 35. The method as defined in claim 34, wherein the web handling vacuum slot extends across the CD width of the wet tissue web.
- 36. The method as defined in claim 29, wherein the flexible scraper has a length extending beyond the foam applicator from between about 1 inch to about {fraction (1/16)} inch greater than the distance from the extrusion head to the upper surface of the wet tissue web.
- 37. The method as defined in claim 29, further comprising positioning a vacuum slot adjacent to the lower surface of the wet tissue web so that the foam is drawn towards the wet tissue web when dispensed from the foam applicator wherein the vacuum slot has a front edge and a second edge.
- 38. The method as defined in claim 37, wherein the front edge of the vacuum slot extends beyond the second end of the flexible scraper by a distance of at least 1 inch.
- 39. The method as defined in claim 29, wherein the drying is accomplished by at least one through-dryer.
- 40. The method as defined in claim 29, wherein the tissue product has a basis weight between about 5 to about 70 grams per square meter.
- 41. The method as defined in claim 29, further comprising dispensing foam from an extrusion head of a second foam applicator onto the lower surface of the wet tissue web.
- 42. A method of applying a liquid-based composition to a wet tissue web capable of being made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:providing a papermaking furnish containing at least cellulosic fibers; forming a wet tissue web from the papermaking furnish, the wet tissue web having an upper surface and a lower surface opposing the upper surface; forming a foam from a liquid-based composition; positioning a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface adjacent to the lower surface of the wet tissue web wherein the lower surface of the flexible scraper is in contact with the lower surface of the wet tissue web and has a first end and a second end, the foam applicator being furnished with the foam; dispensing the foam from an extrusion head of the foam applicator onto the wet tissue web while the wet tissue web has a solids consistency less than about 95% by dry weight of the tissue web wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the lower surface of the wet tissue web by the flexible scraper.
- 43. The method as defined in claim 42, further comprising dispensing foam from an extrusion head of a second foam applicator onto the upper surface of the wet tissue web.
- 44. A method of uniformly applying a liquid-based composition to a dried tissue web made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:providing a papermaking furnish containing at least cellulosic fibers; forming a wet tissue web from the papermaking furnish; drying the wet tissue web to remove water therefrom thereby forming a dried tissue web; forming a foam from a liquid-based composition; applying the foam to the dried tissue web while the tissue web has a solids consistency equal to or greater than about 95% by dry weight of the tissue web wherein the foam is applied by an extrusion head of a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the dried tissue web by the flexible scraper.
- 45. The method as defined in claim 44, wherein the foam is applied to the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 97% by dry weight of the dried tissue web.
- 46. The method as defined in claim 44, wherein the flexible scraper applies sufficient force to the foam to disintegrate the foam.
- 47. The method as defined in claim 44, wherein the flexible scraper is made of materials selected from the group comprising: mylar; plastic; rubber; metal; resin; teflon; and, combinations thereof.
- 48. The method as defined in claim 44, wherein the flexible scraper has a thickness of between about 0.003 inch to about 0.015 inch.
- 49. The method as defined in claim 44, wherein the flexible scraper has a length extending beyond the extrusion head from between about 1 inch to about {fraction (1/16)} inch.
- 50. The method as defined in claim 44, wherein a web handling vacuum slot is positioned opposite the foam applicator with the wet tissue web therebetween and upstream of the foam distribution.
- 51. The method as defined in claim 50, wherein the web handling vacuum slot extends across the CD width of the wet tissue web.
- 52. The method as defined in claim 44, wherein the foam is applied to the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 98% by dry weight of the wet tissue web.
- 53. The method as defined in claim 44, wherein the drying is accomplished by at least one through-dryer.
- 54. The method as defined in claim 44, wherein the dried tissue web is converted into a tissue product has a basis weight between about 5 to about 70 grams per square meter.
- 55. The method as defined in claim 44, further comprising positioning a vacuum slot having a front edge and a second edge opposite the foam applicator with the dried tissue web therebetween so that the foam is drawn towards the dried tissue web when dispensed from the foam applicator.
- 56. The method as defined in claim 55, wherein the front edge of the vacuum slot extends beyond the second end of the flexible scraper by a distance of at least 1 inch.
- 57. A method of applying a liquid-based composition to a dried tissue web capable of being made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:providing a papermaking furnish containing at least cellulosic fibers; forming a wet tissue web from the papermaking furnish, drying the wet tissue web to remove water therefrom, thereby forming a dried tissue web having an upper surface and a lower surface opposing the upper surface; forming a foam from a liquid-based composition; positioning a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface adjacent to the upper surface of the dried tissue web wherein the lower surface of the flexible scraper is in contact with the upper surface of the dried tissue web and the flexible scraper includes a first end and a second end; furnishing the foam applicator with the foam; dispensing the foam from an extrusion head of the foam applicator onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 95% by dry weight of the tissue web wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the upper surface of the dried tissue web by the flexible scraper.
- 58. The method as defined in claim 57, wherein the foam is dispensed onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 97% by dry weight of the tissue web.
- 59. The method as defined in claim 57, wherein the flexible scraper applies sufficient force to the foam to disintegrate the foam.
- 60. The method as defined in claim 57, wherein the flexible scraper is made of materials selected from the group comprising: mylar; plastic; rubber; metal; resin; teflon; and, combinations, thereof.
- 61. The method as defined in claim 57, wherein the foam is dispensed onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 98% by dry weight of the tissue web.
- 62. The method as defined in claim 57, wherein a web handling vacuum slot is positioned opposite the foam applicator with the wet tissue web therebetween and upstream of the foam distribution.
- 63. The method as defined in claim 62, wherein the web handling vacuum slot extends across the CD width of the wet tissue web.
- 64. The method as defined in claim 57, wherein the flexible scraper has a length extending beyond the foam applicator from between about 1 inch to about {fraction (1/16)} inch greater than the distance from the extrusion head to the upper surface of the dried tissue web.
- 65. The method as defined in claim 57, further comprising positioning a vacuum slot adjacent to the lower surface of the dried tissue web so that the foam is drawn towards the dried tissue web when dispensed from the foam applicator wherein the vacuum slot has a front edge and a second edge.
- 66. The method as defined in claim 65, wherein the front edge of the vacuum slot extends beyond the second end of the flexible scraper by a distance of at least 1 inch.
- 67. The method as defined in claim 57, wherein the tissue product has a basis weight between about 5 to about 70 grams per square meter.
- 68. The method as defined in claim 57, wherein the drying is accomplished by at least one through-dryer.
- 69. The method as defined in claim 57, further comprising dispensing foam from an extrusion head of a second foam applicator onto the lower surface of the dried tissue web.
- 70. A method of applying a liquid-based composition to a wet tissue web capable of being made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:depositing a papermaking furnish containing at least cellulosic fibers and water onto a moving fabric surface, thereby forming a wet tissue web on the moving fabric surface; drying the wet tissue web to remove water therefrom thereby forming a dried tissue web wherein the dried tissue web has an upper surface and a lower surface opposing the upper surface; forming a foam from a liquid-based composition; positioning a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface adjacent to the upper surface of the dried tissue web wherein the flexible scraper is in contact with the upper surface of the dried tissue web; furnishing the foam applicator with the foam; dispensing the foam from an extrusion head of the foam applicator onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 95% by dry weight of the tissue web wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the upper surface of the dried tissue web by the flexible scraper.
- 71. The method as defined in claim 70, wherein the foam is dispensed onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 97% by dry weight of the tissue web.
- 72. The method as defined in claim 70, wherein the flexible scraper applies sufficient force to the foam to disintegrate the foam.
- 73. The method as defined in claim 70, wherein the flexible scraper is made of materials selected from the group comprising: mylar; plastic; rubber; metal; resin; teflon; and, combinations thereof.
- 74. The method as defined in claim 70, wherein the foam is dispensed onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 98% by dry weight of the tissue web.
- 75. The method as defined in claim 70, wherein a web handling vacuum lot is positioned opposite the foam applicator with the wet tissue web therebetween and upstream of the foam distribution.
- 76. The method as defined in claim 75, wherein the web handling vacuum slot extends across the CD width of the wet tissue web.
- 77. The method as defined in claim 70, wherein the flexible scraper has a length extending beyond the foam applicator from between about 1 inch to about {fraction (1/16)} inch greater than the distance from the extrusion head to the upper surface of the dried tissue web.
- 78. The method as defined in claim 70, further comprising positioning a vacuum slot adjacent to the lower surface of the dried tissue web :so that the foam is drawn towards the dried tissue web when dispensed from the foam applicator wherein the vacuum slot has a front edge and a second edge.
- 79. The method as defined in claim 78, wherein the front edge of the vacuum slot extends beyond the second end of the flexible scraper by a distance of at least 1 inch.
- 80. The method as defined in claim 70, wherein the drying is accomplished by at least one through-dryer.
- 81. The method as defined in claim 70, wherein the tissue product has a basis weight between about 5 to about 70 grams per square meter.
- 82. The method as defined in claim 70, further comprising dispensing foam from an extrusion head of a second foam applicator onto the lower surface of the dried tissue web.
- 83. A method of applying a liquid-based composition to a wet tissue web capable of being made into a tissue product having a basis weight less than about 120 grams per square meter, the method comprising:providing a papermaking furnish containing at least cellulosic fibers; forming a wet tissue web from the papermaking furnish, the wet tissue web; drying the wet tissue web to remove water therefrom, thereby forming a dried tissue web having an upper surface and a lower surface opposing the upper surface; forming a foam from a liquid-based composition; positioning a foam applicator including a flexible scraper having a lower surface adjacent the wet tissue web and an opposing upper surface adjacent to the lower surface of the dried tissue web wherein the lower surface of the flexible scraper is in contact with the lower surface of the dried tissue web and has a first end and a second end; furnishing the foam applicator with the foam; dispensing the foam from an extrusion head of the foam applicator onto the dried tissue web while the dried tissue web has a solids consistency equal to or greater than about 95% by dry weight of the tissue web wherein the foam flows over the lower surface of the flexible scraper to the wet tissue web; and, distributing the foam on the lower surface of the dried tissue web by the flexible scraper.
- 84. The method as defined in claim 83, further comprising dispensing foam from an extrusion head of a second foam applicator onto the upper surface of the dried tissue web.
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