Patent Application
20210070520
The present invention relates generally to membrane peelable lids with an integrated two-stage tab system, containers comprising such membrane lids, and methods for making the same.
In an embodiment, the invention is directed to a resealable membrane lid for a container comprising: a peelable portion, the peelable portion comprising: a peelable upper layer having an upper surface and a lower surface, a peelable lower layer having an upper surface and a lower surface, and a pressure sensitive adhesive layer adjacent at least a portion of the lower surface of the peelable upper layer and at least a portion of the upper surface of the peelable lower layer, wherein the peelable portion further comprises a central portion and a first pull tab which extends radially from the central portion, and wherein the peelable portion comprises a plurality of score lines which extend at least substantially through the peelable lower layer but do not extend into the peelable upper layer, the score lines comprising: a first score line which is disposed interior of a perimeter of the central portion of the peelable portion, is at least partially circumferential, and defines a peripheral region between the first score line and an edge of the peelable portion, at least one second score line disposed along the perimeter of the central portion of the peelable portion, adjacent the first pull tab, and a third score line which forms the perimeter of a second pull tab; a removable portion, the removable portion comprising: a removable upper layer having an upper surface and a lower surface and a removable lower layer having an upper surface and a lower surface and having a fourth score line disposed circumferentially therethrough, wherein the upper surface of the removable lower layer is affixed to the lower surface of the removable upper layer and the lower surface of the removable lower layer is configured to be sealed to the rim of a container, and a permanent adhesive layer disposed: within the peripheral region, adjacent the removable upper layer and the peelable lower layer, and within at least a portion of the perimeter of the second pull tab, adjacent the removable upper layer and the peelable lower layer.
In another embodiment, the invention is directed to a container having a resealable membrane lid comprising: a container body comprising a bottom wall and at least one upwardly extending sidewall, wherein the at least one sidewall terminates in a rim and wherein the rim defines an open end of the container; and a membrane lid comprising: a peelable portion, the peelable portion comprising: a peelable upper layer having an upper surface and a lower surface, a peelable lower layer having an upper surface and a lower surface, and a pressure sensitive adhesive layer adjacent at least a portion of the lower surface of the peelable upper layer and at least a portion of the upper surface of the peelable lower layer, wherein the peelable portion further comprises a central portion and a first pull tab which extends radially from the central portion, and wherein the peelable portion comprises a plurality of score lines which extend at least substantially through the peelable lower layer but do not extend into the peelable upper layer, the score lines comprising: a first score line which is disposed interior of a perimeter of the central portion of the peelable portion, is at least partially circumferential, and defines a peripheral region between the first score line and an edge of the peelable portion, at least one second score line disposed along the perimeter of the central portion of the peelable portion, adjacent the first pull tab, and a third score line which forms the perimeter of a second pull tab; a removable portion, the removable portion comprising: a removable upper layer having an upper surface and a lower surface and a removable lower layer having an upper surface and a lower surface and having a fourth score line disposed circumferentially therethrough, wherein the lower surface of the removable lower layer is sealed to the rim of the container, wherein the upper surface of the removable lower layer is affixed to the lower surface of the removable upper layer, and a permanent adhesive layer disposed: within the peripheral region, adjacent the peelable lower layer and the removable upper layer, and within a portion of the perimeter of the second pull tab, adjacent the peelable lower layer and the removable upper layer.
In still another embodiment, the invention is directed to a method of manufacturing a flexible membrane lid for a container comprising: providing a peelable upper layer and a peelable lower layer in sheet form; applying a pressure sensitive adhesive to at least one of the peelable upper layer and the peelable lower layer; laminating the peelable upper layer to the peelable lower layer to form a first web; scoring the peelable lower layer of the first web to form a plurality of score lines comprising: a first score line which is disposed interior of a perimeter of the central portion of the peelable portion, is at least partially circumferential, and defines a peripheral region between the first score line and an edge of the peelable portion, at least one second score line disposed at least partially along the perimeter of the central portion of the lid, and a third score line which forms a perimeter of a first pull tab; pattern applying a permanent adhesive to the peelable lower layer within the peripheral region and within a portion of the perimeter of the first pull tab; providing a removable upper layer and a removable lower layer which are affixed to form a second web; laminating the peelable lower layer of the first web to the removable upper layer of the second web, via the permanent adhesive, to form a third web; scoring the removable lower layer of the second web to define: a perimeter of a removable portion of the lid, and a fourth score line which is disposed radially interior of first score line and is circumferential; cutting the third web through at least the peelable upper layer and peelable lower layer to form a perimeter of the peelable portion of the lid, wherein the perimeter of the peelable portion of the lid includes a second pull tab which: extends radially outwardly from a central portion of the lid, and is disposed adjacent the at least one second score line; providing a container comprising a container body which comprises a bottom wall and at least one upwardly extending sidewall, wherein the at least one sidewall terminates in a rim and wherein the rim defines an open end of the container; and sealing the membrane lid to the rim of the container, over the open end.
In an embodiment, the invention is directed to a container system comprising a resealable membrane lid sealed to a rim of a container, wherein the membrane lid comprises a peelable portion and a removable portion which are permanently adhered about their perimeters, permanently adhered in the location of an internal pull tab which is integral to the peelable portion, and other than in the locations of the permanent adhesive, adhesive-free between the peelable portion and the removable portion, wherein the peelable portion comprises an external pull tab and is at least partially peelable and resealable onto the rim of the container via a pressure sensitive adhesive layer, and wherein the removable portion is permanently adhered to the rim of the container and a portion of the removable portion, defined by score lines disposed therein, must be removed in order to access the contents of the container.
A full and enabling disclosure of the present invention, including the best mode thereof directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended drawings, in which:
Elements illustrated in the figures are not necessarily drawn to scale. Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the invention.
Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. 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 modifications and variations can be made in the present invention without departing from the scope or spirit thereof. 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 covers such modifications and variations as come within the scope of the appended claims and their equivalents.
Food and drink products, such as coffee, spices, sugar, cookies, crackers, snacks, as well as non-food items, such as powders, cleaners, and outdoor chemicals are often packaged in resealable containers, such that the component inside the container can be partially used and then the container can be resealed, using a pressure sensitive adhesive (“PSA”) or the like, until the next use. In some cases, however, due to the nature of the PSA seal and/or one or more score lines in or adjacent the PSA, the resealable lid may not provide a hermetic seal, may fail to hold a gas flush, or may not provide an oxygen barrier which meets industry requirements. For example, gasses may inadvertently pass through the PSA portions of the reseal.
In other cases, a flexible, peelable membrane may be adhered over an access point into a container, such as one of the container ends. Flexible, peelable membranes may provide a hermetic seal and may also provide a consumer with easy access to the products contained inside by peeling back the membrane. In many cases, the peelable membrane is peeled back and/or removed from the container by the user through use of a tab that is continuous with the membrane. The tab is pulled up or back to peel the membrane away from the rim of the container, revealing the container contents. However, in these embodiments, the membrane is not resealable.
In the present invention, through ingenuity and hard work, the inventor has developed a resealable, flexible membrane lid which also provides a hermetic seal, holds a gas flush, and/or provides an oxygen barrier which meets industry requirements. In an embodiment, the inventive membrane lid has a pull tab which enables a consumer to grasp and peel a peelable portion of the membrane lid at least partially away from the container. The peelable portion of the membrane lid may be resealable onto to the rim, flange, or edge of the container. In an embodiment, peeling away the peelable portion from the container does not provide access to the container contents. Rather, a separate layer may be disposed beneath the peelable portion, between the peelable portion and the container, which blocks access to the container interior. This separate lower layer may be referred to herein as a removable portion.
In an embodiment, the membrane lid additionally comprises at least a second tab which enables the consumer to grasp and peel at least part of the separate removable portion away from the container. In an embodiment, the removable portion may be at least partially torn in removal from the container. The removable portion may be partially or entirely removable from the container. Once partially or entirely removed, the space previously occupied by the removable portion may provide access to the interior of the container. If entirely removed, the removable portion may then be discarded. In an embodiment, the peelable portion of the membrane lid may then be resealed onto the container, if desired. The reseal allows preservation of the container contents.
In an embodiment, the second tab may be disposed within the perimeter of the membrane lid. In an embodiment, the second tab is integral with the peelable portion of the membrane lid. That is, the second tab is part of, comprised of, and/or continuous with at least one layer of the peelable portion. The second tab, in an embodiment, is defined by score lines in at least one layer of the peelable portion.
In use, when the peelable portion is pulled back, the second tab, which is integral with the peelable portion but permanently adhered to the removable portion, may release or separate from the peelable portion and may remain affixed to the removable portion. The second tab, which is then separated from the peelable portion and affixed to the removable portion, may be grasped and pulled to remove at least part of the removable portion from the access point of the container.
The inventive membrane lid provides an integral solution which is easy to manufacture and easy for the consumer to use. In an embodiment, the lidding is hermetic and, once opened, is resealable. The lidding may hold a gas flush and may provide an oxygen barrier which meets industry requirements. Due to the specific layering, configuration, and die cut structure, diffusion of gases from the interior of the container to the exterior of the container may be significantly reduced or eliminated.
Referring now to the drawings, in
While the embodiment shown in
As shown in the figures, the peelable membrane lid 50 may include multiple layers. In some embodiments, the peelable membrane lid 50 may include a peelable portion 75 and a removable portion 80, each of which may comprise one or more layers. In an embodiment, the peelable portion 75 is disposed above the removable portion 80, with respect to the container. In an embodiment, the peelable portion 75 is an exterior layer and the removable portion 80 is an interior layer, with respect to the container. In an embodiment, the peelable portion 75 is adjacent and at least partially adhered to the removable portion 80. In an embodiment, the lower surface of the peelable portion 75 is adjacent and is at least partially adhered to the upper surface of the removable portion 80. In an embodiment, a permanent adhesive is disposed in a pattern between the interface of the lower surface of the peelable portion 75 and the upper surface of the removable portion 80. In an embodiment, the lower surface of the removable portion 80 is permanently adhered to the rim, flange, or edge of the container.
In an embodiment, the peelable portion 75, as shown in
In an embodiment, a second layer 74 may be disposed adjacent, and in some embodiments, below, the first layer 76, with respect to the container. The second layer 74 may be referred to herein as a lower layer of the peelable portion or a peelable lower layer. In an embodiment, the second layer 74 is part of the peelable portion 75 of the peelable membrane lid 50. In an embodiment, each of the first layer 74 and the second layer 76 has an upper surface and a lower surface. One or more additional layers may be disposed between the first layer 76 and the second layer 74, in certain embodiments.
In an embodiment, the first layer 76 and the second layer 74 of the peelable portion are adhered together, at least partially, via a PSA layer 72. In this embodiment, the first layer 76 and the second layer 74 may sandwich the PSA layer 72. In an embodiment, the lower surface of the upper layer 76 is at least partially adhered to the upper surface of the lower layer 74. In an embodiment, the PSA layer 72 comprises a pattern which is applied between the layers 74, 76 such that it is disposed at least in line with the rim 35 of the container to which the lid is to be applied. In another embodiment, the PSA layer 72 is applied about the circumference of the lid 50, at least in a peripheral region, between layers 74 and 76. In an embodiment, the peripheral region of the peelable portion corresponds to the location of the rim 35 of the container.
In an embodiment, the PSA layer 72 is also disposed between layers 74 and 76 in the location of a second pull tab, to be discussed in more detail below. In this embodiment, the second pull tab, which is integral with the peelable lower layer 76 and defined by certain score lines, is removably adhered to the peelable upper layer 74. In these embodiments, a stronger or permanent adhesive may be disposed between layers 74 and 76 other than in the areas wherein the PSA is disposed—for example in a central portion of the lid 50, inside the peripheral region and outside the second tab. In other embodiments, the PSA layer 72 is flood coated between the layers 74 and 76. That is, the PSA layer 72 may cover the entire surface of either or both layers 74 and 76, on the interface between the layers. The PSA layer 72 may comprise any PSA known in the art.
The second layer 74 of the lid 50 may comprise a flexible film, a paper, a metalized material, any combination of the same, or may be comprised of any other material known in the art. In an embodiment, the first and second layers 76, 74 of the lid 50 comprise the same materials and in other embodiments, the first and second layers 76, 74 of the lid 50 comprise different materials. For example, layer 76 may comprise paper and layer 74 may comprise a polymeric material, in an embodiment. In an embodiment, at least one of the peelable upper layer 76 and the peelable lower layer 74 comprises a polymeric film. In an embodiment, the first and second layers 76, 74 are coextensive with each other (i.e. they have substantially the same width, length, and/or other dimension) and extend at least to the perimeter of the rim 35 of the container.
In some embodiments, the peelable portion 75 may include a pull tab 32, which may be a radially extending portion of or protrusion from the peelable portion 75 that can be grasped by a user, as depicted in
In an embodiment, the peelable lower layer 74 of the peelable portion 75 may be scored or undercut in one or more positions. In an embodiment, the undercuts may extend through the second layer 74 and, optionally, into the PSA layer 72, but preferably not into the first layer 76. In an embodiment, the undercuts result in one or more cut lines in the second layer 74. In an embodiment, the peelable portion 75 comprises a plurality of score lines which extend at least substantially through the peelable lower layer 74 but do not extend into the peelable upper layer 76.
A first cut line 60 may be disposed in a position which aligns with, is adjacent with, or is slightly inside the interior edge (relative to the container) of the rim 35. The first cut line 60 may be disposed circumferentially or substantially circumferentially about the lid 50, sized and configured to substantially align with the interior edge of the rim 35. In an embodiment, the peelable portion 75 comprises a central portion and a first pull tab 32 which extends radially from the central portion. In an embodiment, the first cut line 60 is disposed interior of a perimeter 63 of the central portion of the peelable portion 75. In an embodiment, the first cut line 60 defines an affixed portion 64 of the second layer 74, between cut line 60 and the perimeter 63 of the central portion of the peelable portion 75, which remains affixed to the removable portion 80 and rim 35, while the remainder of the second layer 74 is lifted away from the removable portion 80 and rim 35. In an embodiment, the first cut line 60 is disposed radially interior of the circumferential permanent adhesive 89, discussed below. In an embodiment, the first cut line 60 is disposed radially exterior of the fourth cut line 87, also discussed below.
In an embodiment, the first cut line 60 may be at least partially circumferential. In an embodiment, the first cut line 60 is not fully circumferential (see
In another embodiment, however, the first cut line 60 may be fully circumferential (see
In an embodiment, the affixed portion 64 of the second layer 74 and the remainder of the second layer 74 (the central portion) are hingedly affixed and movable at the point of the hinge 62. The hinge 62 allows the peelable portion 75 to be peeled away from the container 10 without being fully removed from the container 10. In an embodiment, the affixed portion 64 of the second layer 74 is permanently adhered to at least a portion of the removeable portion 80, to be discussed in greater detail below. In an embodiment, the affixed portion 64 circumvents the perimeter of the rim 35. In an embodiment, the hinge 62 is disposed along the perimeter of the rim 35, opposite the tab 32. That is, the hinge 62 may be disposed on the opposite side of the container from the tab 32.
In an embodiment, the hinge 62 is disposed adjacent to or interior of the inner edge of rim 35. In an embodiment, the hinge 62 is substantially aligned with a portion of the fourth cut line 87 (discussed below) of the removable portion 80. In an embodiment, the hinge 62 is radially exterior the fourth cut line 87 (discussed below) of the removable portion 80. In yet another embodiment, the hinge 62 is substantially aligned with a portion of the perimeter of the upper layer 84 of the removable portion 80.
In an embodiment, the second layer 74 is also undercut to form at least one second cut line 66 (shown in
Due to the adhesive layer 72 between layers 74 and 76, at least in the position of tab 32, the tab 32 may comprise first layer 76, second layer 74, and adhesive layer 72 (shown in
In an embodiment, the second layer 74 is additionally undercut to form a third cut line 68. The third cut line 68 may be disposed radially inwardly of the second cut line 66 (relative to the container). The third cut line 68 may be disposed inwardly of the first cut line 60 (relative to the container). The third cut line 68 may be sized and shaped to form an internal or second pull tab 20. In an embodiment, the third cut line 68 may define the perimeter of the second pull tab 20. In an embodiment, the third cut line 68 may be a closed shape. For example, the third cut line 68 may define a rectangle, circle, oval, an irregular shape, or the like. In an embodiment, the third cut line 68 may intersect or be continuous with the first cut line 60 such that the combination of cut line 68 and cut line 60 forms a closed shape.
The internal pull tab 20, in an embodiment, is part of and is integral with the second layer 74. That is, a cut line 68 in the second layer 74 defines the boundaries of the second pull tab 20. The internal tab 20 may be shaped and sized in any manner which is convenient for grasping. In an embodiment, the internal tab 20 may be rectangular, square, half-circular, ovular, or the like. In an embodiment, internal tab 20 comprises a neck portion 22 and a grasping portion 24. In an embodiment, the neck portion 22 of the internal tab 20 may be adjacent the grasping portion. In an embodiment, the neck portion 22 may be disposed closer to the rim 35 than the grasping portion 24, closer to the centerline of the container than the grasping portion 24, or may be disposed in any other position adjacent the grasping portion 24. In an embodiment, the neck portion 22 may be narrower than the grasping portion 24. In an embodiment, the neck portion 22 may of a different shape than the grasping portion 24. The grasping portion 24 may be the portion of the tab which is used to grasp and pull the removable portion 80 away from the container.
In an embodiment, at least a portion of the internal pull tab 20 is permanently adhered to the upper surface of the removable portion 80. In a particular embodiment, a portion of the internal pull tab 20 may be permanently adhered to the upper surface of the foil layer 84. In this embodiment, the neck portion 22 may be permanently adhered to the removable portion 80 (i.e. the foil layer 84). In this embodiment, when the grasping portion 24 is grasped and pulled away from the container, the permanent adhesive between the tab 20 and the removable portion 80 may cause the tab 20 to remain affixed to the removable portion 80, thereby allowing removal of at least a part of the removable portion. In an embodiment, the grasping and pulling of the tab 20 tears at least a portion of the foil layer 84, to be explained more fully below.
As noted above, in an embodiment, the pull tab 32 may be grasped by a user and used to peel the peelable portion 75 away from the container. In an embodiment, peeling back of pull tab 32 and peelable portion 75 may not grant the user access to the container contents 17 because removable portion 80 may remain affixed to the container rim 35, protecting the container contents 17 from exposure to the environment. Thus, pull tab 32 and peelable portion 75 can, in an embodiment, be removed in whole or in part without disturbing the contents 17 of the container 10.
While layer 84 is described as a foil layer, it should be understood that layer 84 may be alternatively referred to as a removable upper layer 84 of the removable portion 80. In this embodiment, the removable upper layer 84 may comprise foil, paper, a polymer, or any combination of the same. In a particular embodiment, removable upper layer 84 comprises a barrier layer, providing a moisture and/or gas barrier between the interior of the container and the surrounding atmosphere.
Similarly, while sealant layer 82 is described as a sealant, the layer may be alternatively referred to as a removable lower layer 82 of the removable portion 80 and may comprise any material known in the art. In an exemplary embodiment, removable lower layer 82 may comprise a polymeric material and may be sealable to a separate polymeric material disposed on the rim 35 of the container or may be sealable to a polymeric container sidewall. Thus, removable lower layer 82 should not be limited to a sealant material. Likewise, however, the sealant layer 82 may comprise any sealant known in the art for adhering membrane lids to containers.
In an embodiment, each of the removable upper layer 84 and the removable lower layer 82 has an upper surface and a lower surface, with respect to the container. One or more additional layers may be present as part of removable portion 80. In an embodiment, the membrane lid 50 is heat sealed onto the rim 35 of the container. In an embodiment, the seal between the sealant layer 82 and the container rim 35 is a permanent heat seal.
In
Cut line 81, also shown in
In an embodiment, a fourth cut line 87 is undercut into the removable portion 80, at least partially, substantially or fully through the sealant layer 82, but preferably not into or through the foil layer 84. The fourth cut line 87 is shown in at least
The cross-sectional view shown in
In an embodiment, a layer of permanent adhesive 89 is disposed along or within the peripheral region 86 of the sealant layer 82, on the upper surface of the sealant layer 82, adjacent the edge or perimeter of the foil layer 84. In another embodiment, a layer of permanent adhesive 89 is disposed along or within the peripheral region 86, but on the upper surface of the foil layer 84, between first cut line 60 and the perimeter of the lid 50. In an embodiment, the permanent adhesive 89 is disposed vertically above the rim 35 of the container. In this embodiment, the permanent adhesive may be any permanent adhesive known in the art. In an embodiment shown in
In another embodiment, permanent adhesive 89 is disposed circumferentially on the lower surface of the lower peelable layer 74. In this embodiment, the permanent adhesive 89 may be disposed between the first cut line 60 and the edge of the lid 50. In this embodiment, the circumferential permanent adhesive 89 may be disposed below the affixed portion 64 of the peelable portion 75. In this embodiment, the circumferential permanent adhesive 89 may be substantially or fully circumferential. In this embodiment, the circumferential permanent adhesive 89 may align with the rim 35 of the container and/or the peripheral region 86 of the removable portion 80.
In an embodiment, permanent adhesive 89 is also disposed in a pattern- applied discrete location on the upper surface of the foil layer 84 and/or the lower surface of the lower peelable layer 74, corresponding to at least a portion of the second tab 20. In an embodiment, the permanent adhesive 89 is disposed in a location corresponding to the neck 22 of the second tab 20. The use of permanent adhesive in this manner serves to permanently adhere a portion of the second tab 20 to the removable portion 80, once the removable portion 80 and peelable portion 75 are laminated or adhered together.
Thus, in an embodiment, the peelable portion 75 is adhered to the removable portion 80, using the permanent adhesive 89, in the peripheral region 86/affixed portion 64 and in a location corresponding to at least a portion of the second tab 20. These regions of permanent adhesion serve to affix the peelable portion 75 to the removable portion 80 in the noted locations.
In an embodiment, the peelable portion 75 and the removable portion 80 are laminated together as shown in
In an embodiment, once the peelable portion 75 is peeled away from the container, a void 77 may be visible on the lower surface of the peelable portion 75, which corresponds to the location of the removed second tab 20. In an embodiment, the void 77 may comprise a missing portion of peelable lower layer 74. The void 77 may or may not have PSA disposed therein. In an embodiment, the void 77 does not have PSA disposed therein and instead displays the lower surface of peelable upper layer 76.
In an embodiment, the interface between the peelable portion 75 and the removable portion 80 may be adhesive-free other than in the regions of the permanent adhesive as described herein, defining at least one adhesive-free region 95 (shown in
In an embodiment, the peelable membrane lid 50 may comprise an integrated peelable label, coupon, promotional piece, product information, or the like printed on one or both surfaces of the peelable portion 75 and/or the removable portion 80. For example, a consumer may peel back the peelable portion 75 to reveal a coupon, product information, dosing information, or nutritional information located on the underside of the peelable portion 75, the upper side of the removable portion 80, and/or the underside of the removable portion 80. In some embodiments, the outermost layer 76 may contain printing, graphics, or ink coloring.
In an embodiment, the body 15 may comprise at least one paperboard body ply, but in some cases, two (or more) plies of paperboard may be spirally wound to form the body 15. Recycled paperboard may, for example, be used in some applications. Moreover, in some cases, a label may be applied to an exterior of the at least one paperboard body ply, such as to provide markings indicating the type of product, brand, manufacturer, ingredients, etc. relating to the product held therein.
In an embodiment, a liner ply may be adhered to the inner surface of the paperboard body ply, via an adhesive. In some embodiments, the liner ply may be a multilayer liner structure that includes a paper layer, a low density polyethylene (LDPE) tie layer that holds one or more mOPP film layers to the paper layer, and a liner sealant disposed on an inner surface of the mOPP film layers. The paper layer may be adhered to the inner surface of the at least one paperboard body ply to affix the mOPP liner ply to the paperboard body ply. The mOPP liner ply and the paperboard body ply may be rolled together outwardly (e.g., with respect to the interior of the body 15) to form the rim 35 at the first end 16 of the body 15, as shown.
In some cases, an overcap may also be provided, where the overcap is configured to engage the first end 16 of the body 15 to cover the peelable membrane 50 before the membrane 50 is removed. The overcap may be, in an embodiment, replaceable onto the rim of the container after peeling of the peelable portion 75 and/or removal of the removable portion 80.
A method of manufacturing a container and membrane lid, as described herein, is also provided. Generally speaking, the method of manufacturing the membrane lid may comprise laminating the top layer 76 of the peelable portion 75 to the bottom layer 74 of the peelable portion, using at least a PSA. The lamination may occur before or after scoring of the bottom layer 74. In a particular embodiment, however, the layers 76, 74 are laminated together using flood-coated PSA and then the laminate peelable portion 75 is undercut. Lines 60, 66, and 68 may be undercut through the bottom layer 74, but preferably not into layer 76. In an embodiment, line 63, defining the perimeter of the lid 50, is not cut at this stage and peelable portion 75 remains in laminate sheet form.
More particularly, as shown in
Next, the top layer 76 and bottom layer 74 may be adhesively joined via the adhesives (station 102) to form a first laminate 110. This first laminate 110 will become the peelable portion 75 of the lid 50. Lamination may be accomplished using a laminating machine comprising two rollers forming a nip therebetween, or may be accomplished using any other method known in the art. In an embodiment, the top layer 76 and bottom layer 74 should be substantially coextensive with each other during the laminating process. For example, if the top layer 76 and bottom layer 74 are rectangular, the width and length of the top layer 76 should match the width and length of the bottom layer 74.
The first laminate 110 may then be undercut (optionally, precision undercut) at station 103 to form cut lines 60, 66, and 68 (shown in
Similarly, the foil layer 84 and the sealant layer 82 may be provided in sheet form. In an embodiment, an adhesive may be pattern applied to the bottom surface of the foil layer 84 or the top surface of the sealant layer 82, as shown at adhesive station 104. The adhesive may be flood coated or applied in any suitable pattern. The adhesives may optionally be dried at a drying station such as an oven or the like.
Next, the foil layer 84 and the sealant layer 82 may be adhesively joined via the adhesives (station 105) to form a second laminate 112. The second laminate 112 will become the removable portion 80 of the lid 50. Lamination may be accomplished using a laminating machine comprising two rollers forming a nip therebetween, or may be accomplished using any other method known in the art. In an embodiment, the foil layer 84 and the sealant layer 82 should be substantially coextensive with each other during the laminating process.
In another embodiment, optionally, the sealant layer 82 may be applied to the underside of the foil layer 84 as a coating or more particularly, as an extrusion coating. In this embodiment, laminating station 105 may be eliminated. In still another embodiment, the sealant layer 82 may be printed onto the underside of the foil layer 84 at a printing station. In these embodiments, the coated extrudate and/or print-coated foil layer 84 may be referred to as the second laminate 112.
In an embodiment, the second laminate 112 may then advance to a scoring station 106. In this embodiment, the second laminate 112 may be overscored to form cut line 83 in the foil layer 84. As with any scoring or cutting station discussed herein, the scoring may be precision scoring with a laser, in an embodiment. In an embodiment, the cut line 83 is cut through foil layer 84 without cutting into sealant layer 82. In a particular embodiment, this scoring step may be omitted, such that foil layer 84 is cut simultaneously with seal layer 82, at cut line 81, so that foil layer 84 and seal layer 82 have the same circumference.
In an embodiment, a permanent adhesive may then be pattern applied to the top surface of the second laminate 112, in predetermined areas, at station 107. In another embodiment, the permanent adhesive is pattern applied to the bottom side of the first laminate 110. The adhesive may be applied in any suitable pattern but, in an embodiment, is applied in at least the area between the laminates 110, 112 in the position of the affixed portion 64 and/or the peripheral portion 86. Likewise, at least a portion of the area between the laminates 110, 112 in the position of the second tab 20, contains permanent adhesive. The adhesive may optionally be dried at a drying station such as an oven or the like. In an embodiment, other than the in the location of the affixed portion 64 and/or the peripheral portion 86, and in the location of a portion of the second tab 20, the remainder of the interface between the first and second laminate 110, 112 remains adhesive-free.
Next, the first and second laminate 110, 112 may be adhesively joined via the permanent adhesive (station 108) to form a third laminate 114. Lamination may be accomplished using a laminating machine comprising two rollers forming a nip therebetween, or may be accomplished using any other method known in the art. In an embodiment, the first and second laminate 110, 112 are coextensive. In an embodiment, this third lamination step at station 108 is conducted in registration such that the undercut line 60 in the first laminate 110 aligns with the region of permanent adhesive applied to the second laminate 112. In this embodiment, the region of permanent adhesive applied to the second laminate 112 may be aligned radially outwardly of undercut line 60. Likewise, the registration should ensure that the permanent adhesive portion which is designed to align with the second pull tab 20 is aligned with at least a portion of the shape defined by undercut line 68.
Next, the third laminate 114 may proceed to a cutting station 109 wherein the sealant layer 82 may be undercut to form cut line 87, which does not extend into foil layer 84, in an embodiment. Also at cutting station 109, cut line 81 may be formed through sealant layer 82 and, optionally, foil layer 84, defining the perimeter of the removable portion 80. The cutting station may comprise a laser cutting station accomplished in registration with the cut lines and adhesive patterns already created.
In an embodiment, the perimeter of the peelable portion 75, also defining the perimeter of the membrane lid 50 (cut line 63) is cut at cutting station 116, through at least layers 76 and 74. Cut line 63 may include the tab 32. As set forth herein, scoring, cutting, and/or perforations may be accomplished via die-cutting, laser-cutting, water-cutting, kiss-cutting, or any other method known in the art. The skeleton 118 of the laminate may then be removed and discarded.
The above-noted steps need not occur in this particular order. For example, in some embodiments, the scoring may be accomplished before the adhesive application/lamination and may be applied in registry with the scoring. Additionally, while the lines are referred to herein as cut lines, score lines, and the like, it should be understood that perforations are also encompassed in the invention. Thus, any of the cut lines described herein may comprise a plurality of perforations. Likewise, the score lines or cut lines may comprise continuous cut lines. Unless otherwise specified, the score lines may extend partially or substantially through a layer or may extend fully through a layer. In the figures, the cut lines are shown as dashed lines when they are undercut and not viewable from the surface of the particular layer. Thus, the dashed lines need not be considered perforations.
In some embodiments, a tubular container body may be formed by spirally winding paperboard ply (e.g., a single ply, two plies, or more) and an optional liner ply, such as by spirally winding continuous strips of the materials around a mandrel of a desired shape (e.g., a cylindrical mandrel) to create the tubular structure. At the downstream end of the mandrel, the tubular structure may be cut into discrete lengths, and the body may be rolled outwardly to form the rim, as described above. The membrane 50, formed above, may then be affixed to the first end of the body 15 by sealing the sealant layer 82 to the rim 35. Optionally, each discrete section of the tubular body (representing a container) may be fitted with at least one end cap (e.g., at an end opposite to the first end 16 shown in
Although an example method of manufacturing a composite container according to embodiments of the invention is described above, it is understood that the steps of manufacturing the container may vary in some cases. For example, the order in which certain manufacturing steps occurs may vary, and/or in some cases certain steps may be omitted, and others may be added.
The method of use is illustrated in
At this stage, if desired, a user may replace the peelable portion 75 onto the container rim 35. At least a portion of the PSA 72 which is disposed between the top layer 76 and the bottom layer 74 will be exposed due to separation of the affixed portion 64 from the remainder of the bottom layer 74. In an embodiment, at least the portion of the PSA 72 which is disposed between the top layer 76 and the bottom layer 74, and located above the affixed portion 64 will be exposed. Thus, if desired, a user may replace the peelable portion 75 onto the container rim 35 and the PSA 72 will engage with affixed portion 64 to create a reseal area. The peelable portion may be peeled away and resealed onto the affixed portion one or more times.
In an embodiment, lifting away of the peelable portion also exposes the second tab 20, which is permanently adhered to the foil layer 84 of the removable portion 80. In an embodiment, the second tab 20 may then be grasped and pulled. As the second tab 20 is pulled, the foil layer 84 may tear along a path substantially aligned with the fourth cut line 87. In another embodiment, the foil layer 84 was not otherwise affixed to the container body and lifts out of the structure with the sealant layer 82. In this embodiment, the cut line 87 allows the sealant layer 82 to separate from the container body. The removable portion 80 may then be fully removed and discarded, if desired.
As described above, at this stage, if desired, a user may replace the peelable portion 75 onto the container rim 35 and the PSA 72 will engage with affixed portion 64 to create a reseal area. The lower surface of removable portion 80, in the location of peripheral region 86, remains sealed to the rim 35 even after removal of the removable portion 80. The circumferential remnants of foil layer 84 and sealant layer 82, in the location of peripheral region 86, remain sealed to the rim 35 even after removal of the removable portion 80 in an embodiment. The lower surface of affixed portion 64 of the peelable portion 75 remains permanently adhered to the upper surface of removable portion 80, in the location of the peripheral portion 86. Thus, the peelable portion 75 may be peeled away and resealed onto the affixed portion 68 one or more times.
The accompanying figures are provided for explanatory purposes and may not show the different layers, plies, adhesives, labels, inks, and other components described above with respect to embodiments of the container. In addition, those components that are illustrated are not necessarily drawn to scale. Thus, certain layers that are shown as the same thickness or thinner than other layers may actually be thicker than other layers, and so on.
Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
