Patent Application
20160015225
The disclosure relates to an absorbent sheet product strip having property against or limiting liquid strike-through. The absorbent sheet products strip may be manufactured from a web of tissue paper (obtained by a Conventional Wet Press or Through Air Drying manufacturing method or other manufacturing method) or a nonwoven fabric (obtained by an air-laid manufacturing method or spun-laid manufacturing method or other manufacturing method). Such an absorbent sheet products strip finds a particular, though non-exclusive, use for sanitary or domestic purposes. As an example, such an absorbent sheet products strip may be used as a toilet paper. Others uses as towels, bath tissues, handkerchiefs, etc. . . . may be possible.
A tissue paper relates to an absorbent paper based on cellulose fibers which is also called tissue paper base-sheet in this field of technology. A typical absorbent paper has a low basis weight, in the range from 10 to 50 g/m2.
A nonwoven fabric comprising cellulosic fibers relates to an absorbent paper which is also called nonwoven or web made of fibers like air-laid web in this field of technology. A typical absorbent paper has a basis weight, in the range from 30 to 250 g/m2, or 40 to 200 g/m2.
U.S. Pat. No. 8,383,223 describes a roll of fibrous cellulosic product that includes a rolled strip of sheets of tissue separated by perforated or pre-cut lines, the individual plies of each sheet being bonded over a peripheral surface area of between 4% and 60% of the total surface area of each sheet. The bonding is carried out via bonding points in the form of large protrusions distributed only over the peripheral zone of the sheet. Namely, the central zone of the sheet is unbounded. This solution overcomes the drawbacks of the prior art but does not authorize having aesthetic designs in the central zone.
Thus, there is a need to improve the protection of the user hand from liquid striking-through a strip of multiple superposed absorbent sheet products, while at the same time proposing absorbent sheet products having a pleasing appearance, namely aesthetic pattern units substantially all over the product surface.
It is desired to propose a strip of absorbent sheet products that overcomes the drawbacks of the prior art. In particular, it is desirable to improve protection of the hand of the user and at the same time to dispose aesthetic pattern units substantially all over the absorbent sheet product surface.
Disclosed is an absorbent sheet products strip, the strip comprising a continuous succession of individual absorbent sheets separated from each other by tear lines, the absorbent sheets being made of at least two plies bonded together by means of bonding points or lines or curves forming pattern units, multiple pattern units being distributed all over a surface of the individual absorbent sheets, wherein the pattern units are distributed all over the surface of the individual absorbent sheets such that the pattern units of one individual absorbent sheet does not superpose with other pattern units of a determined number of successive individual absorbent sheets in the strip when said successive individual absorbent sheets are disposed on each other.
The determined number of successive individual absorbent sheets may be at least two, or, in certain embodiments, three.
The determined number of successive individual absorbent sheets may be disposed on each other by Z-folding.
The strip may comprise a single pattern unit distributed over the surface of the individual absorbent sheets.
The strip may comprise multiple pattern units distributed over the surface of the individual absorbent sheets.
Each individual absorbent sheet may be defined between two consecutive tear lines extending according to a cross-machine direction, each individual absorbent sheet being subdivided in a determined number of zones along a defined direction, and wherein the pattern unit having a size that does not exceed a zone size, the pattern unit being repeated every n zones, n being a pattern repeat, adjacent zones following the zone comprising the pattern unit being free of pattern unit, said repetition continuing over the determined number of successive individual absorbent sheets.
The zones may be columns extending according to the cross-machine direction and distributed along a machine direction. The strip may comprise a single pattern unit distributed all over the surface of the individual absorbent sheets and the determined number of zones is odd.
The determined number of zones may be seven, the pattern repeat n may be four, and the determined number of successive individual absorbent sheets may be three.
The pattern units in the zones may be stripes extending in an inclined manner relatively to the cross-machine direction and distributed along a machine direction.
The pattern units may be of different sizes such that the pattern units are homothetic and homocentric when superposed one over the other, wherein a size of the greatest pattern units does not exceed a zone size, each zone comprising one pattern unit according to the machine direction, and multiple pattern units according to the cross-machine direction.
The pattern units may be arranged in such a manner to be imbricated in each other without superposing one over the other. The pattern units may be ellipsis, or circle, or square, or rectangle, or triangle. All the zones may have the same zone size, or alternatively may have variable zone size.
According to another aspect, there is provided a stack of absorbent sheet product according to embodiments of the invention.
According to a further aspect, there is provided a roll of absorbent sheet product according to embodiments of the invention.
According to still another aspect, there is provided a use of the absorbent sheet product according to embodiments of the invention as towels, kitchen towels, hand towels, toilet papers, wipes and facial tissues.
With the invention, it is possible to precisely control the positioning of the aesthetic pattern units that constitutes the label of the absorbent sheet products. Such a label may be a trademark of the product. Further, it is possible to emboss the aesthetic pattern units in a more marked way. These help in rendering the corresponding label more visible to the users. Thus, this greatly improves the situation with respect to the prior art products like the ones described in U.S. Pat. No. 8,383,223. This advantage is combined to the further one related to the limitation of the speed of liquid strike-through. Furthermore, with embodiments of the invention, the coupling/association between the plies is improved, thus ensuring improving cohesion of the sheet and preventing delamination between each ply during use of the absorbent sheet product. Furthermore, with the invention, it is also possible to ensure ply bonding all over the surface of the absorbent sheet product, in particular in the central portion of the sheets.
Other advantages will become apparent from the hereinafter description of the invention.
Embodiments of the invention are illustrated by way of examples and not limited to the accompanying drawings, in which like references indicate similar elements:
In the drawings and in the hereinafter description, the multiple superposed plies of an individual absorbent sheet or a strip of absorbent sheets have not been represented or described in details for sake of clarity, and also because they are well known in the art and not germane to the present invention.
As an example, a single sheet or three consecutive individual absorbent sheets Z-folded together forms a rectangle having a size around 11 cm×14 cm.
In this exemplary embodiment, the absorbent sheets comprise a single pattern unit 3, for example a lotus flower. Each individual absorbent sheet 1A, 1B and 1C is defined between two consecutive tear lines 4. Each tear line 4 substantially extends according to the cross-machine direction CD. Each individual absorbent sheet 1A, 1B and 1C is subdivided in seven zones along the machine direction MD, for example seven columns C1, C2, C3, C4, C5, C6 and C7 extending parallel to the cross-machine direction CD. The left end of the first column and the right end of the seventh column should be aligned with the two respective consecutive tear lines 4 defining the individual absorbent sheet. The pattern unit size is such that it should not exceed the size of a column in the machine direction MD. The pattern unit should be repeated every four columns, meaning that the three columns following a column comprising a pattern unit should be free of pattern unit. This repetition continues over three consecutive individual absorbent sheets 1A, 1B, 1C.
As a result, when the three consecutive individual absorbent sheets 1A, 1B and 1C are folded according to a Z-folding, the gluing points or lines or curves 3 of each absorbent sheet product 1A, 1B and 1C are not superposed. As a consequence, liquids 7 above gluing points or lines or curves 3 only strike-through 9 the externally positioned absorbent sheet product 1C and then liquids 7 are substantially blocked, meaning that the liquids 7 do not further strike-through towards the internally positioned absorbent sheet product 1A. The strike-through that is mentioned here is the one relative to the pattern unit, not the one inherent to the absorption capacity of the material (tissue paper or non-woven) forming the absorbent sheet product itself.
In both
One can visually see that the liquid drop strikes-through the absorbent sheet products strip according to the prior art (the spot of liquid strike-through 8 is surrounded by plain line circle), while there is not any visible sign of liquid strike-through at the verso of the last absorbent sheet product 1C according an embodiment of the invention (the spot of liquid strike-through 9 is surrounded by dotted line circle).
This embodiment gives the best results when three consecutive individual absorbent sheets are Z-folded together. However, such results would not be impaired by a user combining more individual absorbent sheets together in a Z-folded manner, for example four, five, etc.
Again, each individual absorbent sheet 1A, 1B and 1C is defined between two consecutive tear lines 4 substantially extending according to the cross-machine direction CD. Each individual absorbent sheet 1A, 1B and 1C is subdivided in seven zones along the machine direction MD, for example seven columns C1, C2, C3, C4, C5, C6 and C7 extending parallel to the cross-machine direction CD. The left end of the first column and the right end of the seventh column should be aligned with the two respective consecutive tear lines 4 defining the individual absorbent sheet. The pattern unit size of the greatest ellipsis 3A is such that it should not exceed the size of a column in the machine direction MD. Each column comprises a pattern unit. A succession of the four different pattern units, for example 3A, 3C, 3B, 3D is repeated over four columns. This succession continues over three consecutive individual absorbent sheets 1A, 1B, 1C. The repetition is resumed on the fourth consecutive individual absorbent sheet (not shown).
As a result, when the three consecutive individual absorbent sheets 1A, 1B and 1C are folded according to a Z-folding, the gluing points or lines or curves 3 of each absorbent sheet product 1A, 1B and 1C are not superposed, they are imbricated in each other over the three superposed layer (see
This embodiment may also be implemented with other kinds of pattern units representing geometric figures, for example circles, or squares, or rectangles, or triangle (not shown). Each kind of pattern unit is characterized by various scale factors (homothety) and a substantially identical center (homocentric) in order to imbricate either circles, or squares, or rectangles, or triangles in each other without superposition of their perimeters. Other geometric figures may also be considered.
Each individual absorbent sheet 1A, 1B and 1C is subdivided in ten zones along the machine direction MD, for example ten columns C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10 extending parallel to the cross-machine direction CD. The left end of the first column and the right end of the seventh column should be aligned with the two respective consecutive tear lines 4 defining the individual absorbent sheet.
As an example, the first absorbent sheet 1A comprises only circles, the second absorbent sheet 1B comprises only triangles, and the third absorbent sheet 1C comprises only hexagons distributed over the sheet surface. Further, on the first absorbent sheet 1A, the circles 3A are distributed in the first column C1, fourth column C4, seventh column C7 and tenth column C10. On the second absorbent sheet 1B, the triangles 3B are distributed in the second column C2, fifth column C5 and eighth column C8. On the third absorbent sheet 1C, the hexagons 3C are distributed in the third column C3, sixth column C6 and ninth column C9.
The above example is not limitative because other kinds of distribution of the pattern unit in a specific column or in the entire columns can be different. What is important is that the various pattern units 3A, 3B, 3C are distributed over a defined number of columns, e.g. ten columns of the three absorbent sheets 1A, 1B and 1C in such a way that, when the three absorbent sheets 1A, 1B and 1C are superposed (see
Each individual absorbent sheet 1A, 1B, 1C and 1D is subdivided in twelve zones along the machine direction MD, for example twelve columns C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11 and C12 extending parallel to the cross-machine direction CD. The left end of the first column and the right end of the seventh column should be aligned with the two respective consecutive tear lines 4 defining the individual absorbent sheet.
As an example, the first absorbent sheet 1A comprises only circles, the second absorbent sheet 1B comprises only triangles, the third absorbent sheet 1C comprises only hexagons, and the fourth absorbent sheet 1D comprises only suns distributed over the sheet surface. The distribution of the various pattern units 3A, 3B, 3C and 3D over the twelve columns of the four absorbent sheets 1A, 1B, 1C and 1D is such that, when the four absorbent sheets 1A, 1B, 1C and 1D are superposed (see
Again, each individual absorbent sheet 1A, 1B and 1C is defined between two consecutive tear lines 4 substantially extending according to the cross-machine direction CD. Each individual absorbent sheet 1A, 1B and 1C is subdivided in ten zones that are inclined relatively to the cross-machine direction CD, for example ten inclined columns C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10 of variable size (for sake of drawing clarity, the columns are only shown with respect to third absorbent sheet 1C). It means that this embodiment differs from the preceding embodiment in that there is no alignment between the columns and the tear lines 4. In the present example, the inclined stripes pattern units 3A, 3B, 3C are mingled with the inclined columns C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10, namely the pattern units fully cover the corresponding zones.
Further, the directions D1 and D2 of the inclined columns of two consecutive individual absorbent sheets are symmetrical relative to the machine direction MD. It means that the direction D1 of the inclined columns of the first absorbent sheet 1A and of the third absorbent sheet 1C is different from the direction D2 of the inclined columns of the second absorbent sheet 1B, both directions D1 and D2 being symmetrical relative to the machine direction MD. As an example, the first absorbent sheet 1A comprises two stripes inclined according to the first direction D1, the second absorbent sheet 1B comprises three stripes inclined according to the second direction D2, and the third absorbent sheet 1C comprises five stripes inclined according to the first direction D1, all of these stripes being distributed over the various sheets' surfaces. Further, on the first absorbent sheet 1A, the stripes are completely mingled with the fourth column C4 and eighth column C8. On the second absorbent sheet 1B, the stripes are completely mingled with the second column C2, sixth column C6 and tenth column C10. On the third absorbent sheet 1C, the stripes are completely mingled with the first column C1, third column C3, fifth column C5, seventh column C7 and ninth column C9. Therefore, the distribution of the various stripes 3A, 3B and 3C over the ten columns of the three absorbent sheets 1A, 1B and 1C is such that, when the three absorbent sheets 1A, 1B and 1C are superposed (see
As illustrated in
The drawings and their descriptions hereinbefore illustrate rather than limit the invention.
Though the drawings show three or even four individual absorbent sheets, the effect of the invention of limiting liquid strike-through applies to the whole roll or stack, namely whatever the determined number of successive individual absorbent sheets taken successively from either the whole roll, or the whole stack.
The invention has been described with respect to various embodiments of absorbent sheet products made of sheets strips or sections comprising multiple plies. The skilled person will readily recognize that the absorbent sheet product may be formed with two, three, four, five, etc. plies while still being within the scope of the present invention. Further, the shape of the individual sheets has always been depicted as rectangular while other shapes, e.g. a square shape, may be appropriate for the intended use.
The numbers, positions and shapes of the pattern units in the depicted embodiments are non-limitative examples. The skilled person will readily recognize that these numbers, positions and shapes may be changed if desired or deemed necessary with respect to for example the tridimensional structure effect, commercial, advertising and/or aesthetic effect that is/are intended to be achieved by the absorbent sheet products.
The pattern units include embossed/knurled areas or lines or curves in combination with an adhesive used to associate/bond plies together, but are not intended to include or to interfere with micro-embossed areas, namely areas comprising protrusions at a density of at least 20 protrusions/cm2 that may be typically employed to give softness to the sheet.
Any reference sign in a claim should not be construed as limiting the claim. The word “comprising” does not exclude the presence of other elements than those listed in a claim. The word “a” or “an” or “at least one” preceding an element does not exclude the presence of a plurality of such element.
| Number | Date | Country | Kind |
|---|---|---|---|
| 14002485.2 | Jul 2014 | EP | regional |
