METHOD AND DEVICE FOR PRODUCING A MULTI-PLY WEB OF FLEXIBLE MATERIAL, SUCH AS PAPER AND NONWOVEN, AND MULTI-PLY MATERIAL AND PRODUCT PRODUCED BY THE METHOD

Description

Technical field

[0001] The present invention refers to a method for producing a multi-ply web of flexible material, such as paper and nonwoven material, by means of gluing the plies. Especially it refers to production of tissue products such as toilet and kitchen paper, paper towels, hand towels, napkins, handkerchiefs, wiping material and the like. The invention further refers to a multi-ply web of flexible material, such as paper and nonwoven, comprising at least a first and a second ply, which are interconnected by means of gluing in a glue pattern. The invention also refers to a product made from the multi-ply web.

Background of the invention

[0002] It is very common to laminate two or more tissue plies in order to produce the final tissue product. Herewith a more flexible and softer tissue product is obtained as compared to if one single ply with a corresponding thickness and basis weight had been produced as for the laminated product. The absorbent capacity and the bulk are moreover improved.

[0003] The lamination of two or more tissue plies is often made by means of gluing. A mechanical embossing of the plies is also often performed before they are glued together. It is further known to laminate two plies only by means of a mechanical embossing, at which a mechanical joining of the plies occurs in the embossing sites.

[0004] Through for example EP-A-796 727 it is known to first emboss two paper plies in a three dimensional structure with alternating raised and recessed portions, after which glue is applied to one of the plies and the two plies are joined in a press nip between two embossing rolls, so that the raised portions of the respective plies are glued to each other. A similar embossing procedure is shown in EP-A-738 588, according to which the glue also has a colouring effect.

[0005] In WO 95/08671 there is disclosed an example of so called nested embossing, in which the two individually embossed plies are combined and joined with the raised portions of one ply nesting into the recessed portions of the opposite ply.

[0006] Through US-A-5,443,889 there is known a procedure for laminating two paper plies, which are fed over a pattern roll each, said pattern rolls having alternating raised and recessed portions and where glue is applied to one ply while this is led over the roll. The two paper plies are then glued together in a nip between the two pattern rolls, which are in register with each other so that a joining and compression of the paper plies occurs in a pattern corresponding to the raised portions of the pattern rolls.

[0007] A drawback that occurs in connection with embossing a paper web where this is compressed in spots, is that a considerable strength reduction occurs in the embossing and glue sites, which effects the strength properties of the entire paper product. Strength reductions of up to 70% of an embossed paper as compared to a corresponding unembossed paper are not unusual.

[0008] US-A-3,672,950 discloses a method for producing a quilted or cushioned adhesively laminated tissue product in which glue is applied in a certain pattern to one tissue ply in a press nip between a first pattern roll and an impression roll. This ply is laminated to another ply in a press nip between the same impression roll and a second pattern roll having a pattern corresponding with that of the first pattern roll and driven in registry with the first pattern roll. The two plies are in different conditions of stress during the lamination process, so that a quilted or cushioned product is provided.

Object and most important features of the invention

[0009] The object of the present invention is to provide a method for producing a multi-ply web of flexible material, such as paper and nonwoven and combinations thereof, wherein at least two plies of flexible material are laminated together. The lamination should be lenient to the material so that the material structure of the plies is substantially maintained as well as its strength properties. The absorbent capacity and bulk of the finished product should moreover be high.

[0010] This has according to the invention been provided by bringing a first pattern roll, having a three dimensional pattern of alternating raised and recessed portions, in contact with a glue application device, applying glue to a first web shaped flexible material in a first press nip in a pattern corresponding to the configuration of the tops of the raised portions, the pattern configuration of the first pattern roll is chosen so that glue is applied to said first web shaped flexible material in glue sites covering an area corresponding to between 0.03 and 9% of the total area of the web shaped flexible material and sparsely distributed over substantially the entire area of the web shaped flexible material, a second web shaped flexible material being brought in contact with the glue applied side of said first web shaped flexible material in a second press nip between a second pattern roll having a three dimensional pattern of alternating raised and recessed portions corresponding to the pattern of said first pattern roll and an impression roll, the web tension of said first and second web shaped flexible materials are substantially equal as they are fed into the second press nip, the first and second pattern rolls being in registry with each other, so that the first and second web shaped flexible materials are pressed and glued together in a pattern corresponding to the configuration of the tops of the raised portions of said first pattern roll.

[0011] Through this procedure there will be no real embossing of the material web in connection with the lamination, but only a gluing together of the plies in a glue pattern. A strength reduction of the final product is herewith avoided at the same time as a volume is created between the plies between the glue sites, which increases the bulk and absorption capacity. The bulk from the separate plies is further substantially maintained after the lamination process.

[0012] According to a one embodiment the glue is a coloured glue.

[0013] In one embodiment of the invention at least one of the plies before lamination with the opposite ply is exerted to a three-dimensional patterning.

[0014] According to a further embodiment at least two plies before lamination is exerted to a three dimensional patterning, the patterns provided on the at least two plies having different structures, for example one pattern being relatively fine and another pattern being relatively coarse.

[0015] According to still a further embodiment at least one ply is reinforced with strings of glue or curing bonding agent, for example latex. Said curing agent is cured after lamination.

[0016] The size of each glue site should amount to between 0.15 and 150, preferably between 0.5 and 100 mm², more preferably between 1 and 15 mm². In an alternative embodiment the size of each glue site amounts to between 150 and 400 mm². The number of glue sites per area unit should amount to between 25 and 350000, preferably between 300 and 180000 and more preferably between 800 and 50000 glue sites per m². It is pointed out that the glue sites may be regularly distributed over the area of the web shaped material, but they may also be irregularly distributed, for example arranged in groups spaced apart.

[0017] The term spots in this respect refers to any shape of the glue sites, such as small points, lines, figures, letters, phantasy patterns or any desired shape.

[0018] The invention further refers to a multi-ply web of flexible material, such a paper and nonwoven, comprising at least one first and one second ply which are interconnected by gluing in glue sites forming a glue pattern, wherein the glue sites cover an area corresponding to between 0.03 and 9% of the total area of the ply and sparsely distributed over substantially the entire area of the ply and that one external surface of said multi-ply web just opposite the glue sites has substantially no and the opposite external surface of said multi-ply web has slight compacting impressions in the material provided in connection with the joining of the plies.

[0019] Further features of the invention are disclosed in the following description and in the claims.

Description of drawings

[0020] The invention will in the following be closer described with reference to an embodiment shown in the accompanying drawings.

Fig. 1 shows a schematic side view of a device for performing the method according to the invention.

Fig. 2 is a schematic cross section of an embodiment of a two-ply paper produced according to the method.

Fig. 3a-c are plan views of some glue patterns on a paper ply according to the invention.

Fig. 4 is a schematic cross section of an embodiment of a three-ply paper according to the invention.

Description of an embodiment

[0021] Fig. 1 shows a device for producing a two-ply material, e g paper, especially tissue paper. A first paper web 1 is fed over a roll 2 towards a glue application station. This comprises a glue chamber 3 from which glue is applied on a glue transfer roll 4. The glue transfer roll 4 is in contact with a first pattern roll 5, which along its periphery is provided with a pattern of alternating raised 6 and recessed portions 7. The glue transfer roll 4 is only contacting the tops of the raised portions 6, so that glue is only applied thereon. The paper web 1 is passed into a press nip 8 between the first pattern roll 5 and a centrally placed impression roll 9. Glue will thus be applied to the first paper web 1 in a pattern corresponding to the configuration of the tops of the raised portions 6. The pressure in the press nip between the pattern roll 5 and the impression roll 9 is only sufficiently high to accomplish a transfer of glue to the paper web 1. However there should preferably be no deformation of the paper web, i e no impression of the raised portions 6 of the pattern roll 5 into the paper web.

[0022] A second paper web 10 is fed over a roll 11 and into a press nip 12 between a second pattern roll 13 and the centrally placed impression roll 9. The second pattern roll 13 has a three dimensional pattern of raised 14 and recessed portions 15 corresponding to the pattern of the first pattern roll 5. The term "corresponding to" in this respect means that the raised portions 14 either have the same shape and size of the effective surface area as the raised portions 6 of the first pattern roll 5, the same shape but a larger effective surface area than the raised portions 6 of the first pattern roll 5 so as to extend outside the outer circumference of the glue sites provided by the first pattern roll 5 or a different shape and a larger effective surface area than the raised portions 6 of the first pattern roll 5. For example a glue pattern provided by the first pattern roll 5 may be in the form of groups of three dots arranged in a triangular pattern as shown in Fig. 3a, wherein the raised portions 14 of the second pattern roll 13 may either be exactly the same as or slightly larger than the glue pattern, or may for example be in the form of a triangle 20 covering the three dots. In all these cases the relative position of the pattern on the two pattern rolls 5 and 13 are in correspondence with each other.

[0023] The web tension of said first and second plies 1 and 10 are substantially equal as they are fed into the second press nip 12. Herewith there will be no foreshortening effect from the lamination. The two pattern rolls 5 and 13 are driven in registry with each other so that the first and second paper webs 1 and 10 are pressed and glued together in a pattern corresponding to the configuration of the glue pattern provided by the first pattern roll 5.

[0024] It is preferred that one centrally impression roll 9 is used for both the first and second pattern rolls 5 and 13, as is shown in Fig. 1. However it would of course also be possible to use two separate impression rolls for the first and second pattern roll 5 and 13, and to synchronize them so that they are driven in registry.

[0025] Also in this second press nip the pressure should be low and only sufficiently high to provide a gluing together of the two paper webs 1 and 10. The pressure in the second press nip should not be higher than to cause only slight compacting impressions 19 just opposite the glue sites in the second ply 10 facing the second impression roll 13.

[0026] The opposite external surface of said multi-ply web, i e the surface facing the central impression roll 9 will substantially maintain its structure unaffected by the lamination process with no compacting impressions in the material opposite the glue sites. The laminated multi-ply product is denoted 16.

[0027] The pattern on the two pattern rolls 5 and 13 can be optional, but should be chosen so that glue is applied to the paper web 1 in an amount corresponding to between 0.03 and 9%, preferably between 0.1 and 6% the total surface area of the paper web 1. In the present case the glue sites are sparsely distributed over substantially the entire area of the laminated product. It is with the method according to the invention possible to provide a very distinct positioning of the glue sites, wherein a very small amount of glue is needed. This means advantages with respect to softness, drapability, absorption etc. In the case that the glue pattern comprises a plurality of discrete glue sites the number of glue sites per area unit should amount to between 25 and 350000 glue sites per m², preferably between 300 and 180000 glue sites per m² and more preferably between 800 and 50000 glue sites per m². According to one embodiment the size of each glue site amounts to between 0.15 and 150 mm², preferably between 0.5 and 100mm² and more preferably between 1 and 15 mm². According to an alternative embodiment the size of each glue site amounts to between 150 and 400 mm², which applies for certain composite glue patterns comprising thin lines, e g 1 mm in width, forming for example a symbol or a figurative pattern. In such an embodiment the number of glue sites per m² will be in the lower part of the above interval, for example less than 800.

[0028] In the case of large glue sites screened patterns can be used, which means that each glue pattern unit is built up of a plurality of small screen dots. The size of the glue site in this case is defined as the circumscribed area of the combination of screen dots forming a glue pattern unit.

[0029] According to a further embodiment the glue pattern is composed of continuous lines forming for example a network.

[0030] Preferred glues are the ones commonly used for paper, such as carboxy methyl cellulose (CMC), polyvinyl alcohol (PVOH), ethylene vinyl acetate (EVA), polyvinyl acetate (PVAc), ethylene acrylic acid, vinyl acetate acrylic acid, styrene acrylic acid, polyurethane, polyvinylindene chloride, starch, chemically modified starch, dextrin, water soluble polymers such as latexes and milky colloids in which natural or synthetic rubber or plastic is suspended un water. In case the material webs are of other material than paper glues suited for these materials are of course chosen.

[0031] It is preferred that glues having a relatively high dry content are used, since this enables a distinct positioning of the glue sites.

[0032] Coloured glues may also be used, which give a visual effect and therewith a patterning effect to the material.

[0033] In Fig. 2 there is shown an example of a two-ply paper produced according to the invention, at which the glue sites between the two paper plies 1 and 10 are denoted 17. Between the glue sites 17 the paper plies 1 and 10 are free and not attached to each other and empty spaces 18 are created which increase the bulk and absorption capacity of the material, properties that are important for e g soft paper. Substantially the entire bulk from the separate plies is maintained after the lamination. The second paper web 10 can just opposite the glue sites have slight compacting impressions 19 caused by the pattern roll 13.

[0034] Fig. 3a-c show some examples of glue patterns, wherein discrete glue sites 17 in the form of dots or lines are arranged to form different patterns. The glue sites 17 may also be in the form of continuous lines for example forming a network pattern.

[0035] The paper webs 1 and 10 that are laminated can be either smooth but also have a three-dimensional structure provided earlier in the process, for example during forming, dewatering and/or drying of the paper web. A three-dimensional structure may also be provided by embossing the dry paper webs before lamination. The method according to the invention is very lenient to such a pattern, so that this is maintained substantially intact throughout the laminating process.

[0036] Fig. 4 shows an embodiment of a three-ply paper in which the plies 1, 10 and 20 before lamination have been exerted to a three dimensional patterning, for example embossing. The structures of the embossing patterns are different, so that the pattern structure of the middle ply 10 is coarser than that of the two outer plies 1 and 20. A high-bulk product is then obtained. The glue sites 17 between plies 1 and 10 may, as disclosed, be applied offset with respect to the glue sites between plies 10 and 20, or be applied just opposite each other. Other combinations of different embossing patterns may of course be used than what is shown in Fig. 4. Multi-ply products having different structures on opposite sides may be created if the two outer plies have different embossing structures, such as one coarser side and one smoother side. So called micro quilted embossing patterns may also be used. One or more plies may further be unembossed. In the case of a two-ply product a two-sided product is obtained if one ply is embossed and the other unembossed or have a different embossing structure.

[0037] The embossing patterns used for the different layers may also be the same. In this case the plies may be embossed jointly and then separated from each other before being laminated by the method according to the invention. They may also be separately embossed before lamination.

[0038] An important advantage of the invention is that the paper substantially maintains its strength properties through the lamination process. In many other lamination processes, in which an embossing and deformation of the paper webs occur in connection with lamination, the strength properties of are decreased. In case the laminated multiply web has a substantially smooth structure it can be converted into dense rolls or folded products, which means space- and cost saving.

[0039] The laminated multiply product may also if desired, due to the strong ply bonding provided by the glue spots, be embossed after the lamination process, thereby creating a softer material. The effective ply bonding is achieved due to the distinct gluing effect provided by the second pattern roll 13 driven in registry with the glue transfer roll 4. This ply bonding effect is not reduced when converting, for example rolling, the paper product, which may be the case for ply bonding provided by embossing.

[0040] Three or more paper plies may of course be laminated with the method described above. Thus two or more plies may enter the first and/or second press nip.

[0041] Different kind of paper with different properties with respect to absorption capacity, basis weight, manufacturing technique, fiber composition, chemical additives may be used in the different plies.

[0042] The method is further suitable to use for paper plies having holes therein, since the main part of the holes will be intact throughout the lamination process and not be filled with glue, which normally is the case when gluing the plies together.

[0043] At least one paper ply may further be reinforced with thin strings of glue or a curing bonding agent, such as latex. The reinforcement may for example take place on the outside of the laminated product after lamination and in register with the lamination process. In the case of a curing bonding agent the paper product is cured after lamination, for example by heat treatment. When reinforcing the paper plies in this manner, very thin materials may be used, which otherwise would not have been possible to use, because of an insufficient strength to be handled in the converting process or in a dispenser.

[0044] The multi-ply web may be converted to any desired product, such as rolls, folded hand towels, wipes, handkerchief, napkins etc. It would be of advantage to use the multi-ply web according to the invention in so called center-feed coreless rolls, in which the paper is taken from the center of the roll. For a conventional multi-ply web in which joining of the plies is connected with embossing, the innermost revolutions, which are compressed rather hard so that the embossing is more or less destroyed, will not come out as a satisfactory product. In the multi-ply web according to the invention, on the other hand, lamination of the plies is separated from any patterning effect provided by embossing or the like and thus also the innermost revolutions of the coreless roll will form a useful product.

Claims

1. Method for producing a multi-ply web (14) of flexible material, such as paper and nonwoven material, by means of gluing the plies,
characterized in
bringing a first pattern roll (5), having a three dimensional pattern of alternating raised (6) and recessed portions (7), in contact with a glue application device (4), applying glue to a first web shaped flexible material (1) in a first press nip (8) in a pattern corresponding to the configuration of the tops of the raised portions (6), the pattern configuration of the first pattern roll (5) is chosen so that glue is applied to said first ply (1) in glue sites (17) covering an area corresponding to between 0.03 and 9% of the total area of the first web shaped flexible material (1) and sparsely distributed over substantially the entire area of the first web shaped flexible material (1), a second web shaped flexible material (10) being brought in contact with the glue applied side of said first web shaped flexible material (1) in a second press nip (12) between a second pattern roll (13) having a three dimensional pattern of alternating raised (14) and recessed portions (15) corresponding to the pattern of said first pattern roll (5) and an impression roll (9), the web tension of said first and second plies (1,10) are substantially equal as they are fed into the second press nip (12) the first and second pattern rolls (5,13) being in registry with each other, so that the first and second first web shaped flexible materials (1) are combined and glued together in a pattern corresponding to the configuration of the tops of the raised portions (6) of said first pattern roll (5).

2. Method as claimed in claim 1,
characterized in
that glue is applied to said first ply (1) in glue sites (17) covering an area corresponding to between 0.1 and 6% of the total area of the first web shaped flexible material (1)

3. Method as claimed in claim 1 or 2,
characterized in
that the pattern provided by the raised portions (14) of the second pattern roll (13) has a larger area than that provided by the raised portions (6) of the first pattern roll (5), so that the pattern of the second pattern roll (13) extends outside the glue sites (17) provided by the first pattern roll (5).

4. Method as claimed in any of the preceding claims,
characterized in
that the glue is a coloured glue.

5. Method as claimed in any of the preceding claims,
characterized in
that at least one of the plies (1,10) before lamination with the opposite ply is exerted to a three dimensional patterning provided on the ply while wet, during drying of the wet ply and/or in dry state.

6. Method as claimed in claim 5,
characterized in
that at least two plies (1,10) before lamination is exerted to a three dimensional patterning, the patterns provided on the at least two plies having different structures, for example one pattern being relatively fine and another pattern being relatively coarse.

7. Method as claimed in any of the preceding claims,
characterized in
reinforcing at least one ply with strings of glue or curing bonding agent, for example latex.

8. Method as claimed in claim 7,
characterized in
curing said bonding agent after lamination.

9. Method as claimed in any of the preceding claims,
characterized in
that the size of each glue site (17) amounts to between 0.15 and 150mm², preferably between 0.5 and 100mm² and more preferably between 1 and 15 mm².

10. Method as claimed in any of claims 1-8,
characterized in
that the size of each glue site (17) amounts to between 150 and 400 mm².

11. Method as claimed in any of the preceding claims,
characterized in
that the number of glue sites (17) per unit area amounts to between 25 and 350000 glue sites per m², preferably between 300 and 180000 glue sites per m² and more preferably between 800 and 50000 glue sites per m².

12. Multi-ply web (16) of flexible material, such a paper and nonwoven, comprising at least one first (1) and one second ply (10) which are interconnected by gluing in glue sites (17) forming a glue pattern,
characterized in
that the glue sites (17) cover an area corresponding to between 0.03 and 9% of the total area of the ply and sparsely distributed over substantially the entire area of the ply and that one external surface of said multi-ply web just opposite the glue sites (17) has substantially no and the opposite external surface of said multi-ply web has slight compacting impressions (19) in the material provided in connection with the joining of the plies (1,10).

13. Multi-ply web as claimed in claim 12,
characterized in
that the glue sites (17) take up a total area of between 0.1 and 6% of the total surface area of the respective ply (1,10).

14. Multi-ply web as claimed in claim 12 or 13,
characterized in
that the size of each glue site (17) amounts to between 0.15 and 150mm², preferably between 0.5 and 100mm² and more preferably between 1 and 15 mm².

15. Multi-ply web as claimed claim 12 or 13,
characterized in
that the size of each glue site (17) amounts to between 150 and 400 mm².

16. Multi-ply web as claimed in any of claims 12-15,
characterized in
that the glue in the glue sites (17) is coloured.

17. Multi-ply web as claimed in any of claims 12-16,
characterized in
that at least one of the plies (1,10) has a three-dimensional pattern provided before joining with the opposite ply.

18. Multi-ply web as claimed in claim 17,
characterized in
that at least two plies (1,10) has a three-dimensional pattern provided before joining with the opposite ply, the patterns provided on the at least two plies having different structures, for example one pattern being relatively fine and another pattern being relatively coarse.

19. Multi-ply web as claimed in claim 17 or 18,
characterized in
that the multi-ply web has one external side with a relatively coarse three-dimensional structure and one external side with a relatively smooth structure.

20. Multi-ply web as claimed in any of claims 17-19,
characterized in
that the multi-ply web has at least three plies, with one middle ply having a relatively coarse three-dimensional structure.

21. Multi-ply web as claimed in any of claims 12-20,
characterized in
that at least one ply is reinforced with strings of glue or curing bonding agent, for example latex.

22. Multi-ply web as claimed in any of claims 12-21,
characterized in
that at least one of the plies (1,10) has holes therein.

23. A roll, folded towel, wipe, handkerchief, napkin and the like of web-shaped material,
characterized in
that said web-shaped material is a multi-ply web as claimed in any of claims 12-22.

24. A roll of web-shaped material as claimed in claim 23,
characterized in
that said roll is a center-feed coreless roll.

25. A product of web-shaped material as claimed in claim 23 or 24,
characterized in
that said web-shaped material is tissue paper.

Ansprüche

1. Verfahren zum Herstellen einer mehrlagigen Bahn (14) aus flexiblem Material wie beispielsweise Papier und Vliesstoff mittels Verkleben der Lagen,
gekennzeichnet durch
in Kontakt bringen einer ersten Musterwalze (5) mit einem dreidimensionalen Muster aus abwechselnd erhabenen (6) und vertieften Abschnitten (7) mit einer Klebstoffapplikationseinrichtung (4), die in einem ersten Pressspalt (8) Klebstoff in einem Muster entsprechend der Konfiguration der Oberseiten der erhabenen Abschnitte (6) auf ein erstes bahnförmiges flexibles Material (1) aufbringt, wobei die Konfiguration des Musters der ersten Musterwalze (8) derart gewählt ist, dass Klebstoff an Klebstoffstellen (17), die einen Bereich entsprechend zwischen 0,03 und 9 Prozent der Gesamtfläche des ersten bahnförmigen flexiblen Materials (1) bedecken und spärlich über im Wesentlichen die gesamte Fläche des ersten bahnförmigen flexiblen Materials verteilt sind, auf die erste Lage (1) aufgebracht wird, wobei ein zweites bahnförmiges flexibles Material (10) in einem zweiten Pressspalt (12) zwischen einer zweiten Musterwalze (13) mit einem dreidimensionalen Muster aus abwechselnd erhabenen (14) und vertieften Abschnitten (15) entsprechend dem Muster der ersten Musterwalze (5) und einer Gegenwalze (9) in Kontakt mit der Seite des ersten bahnförmigen flexiblen Materials (1) wird auf der der Klebstoff aufgebracht wurde, wobei die Bahnspannung der ersten und zweiten Lage (1, 10) im Wesentlichen gleich ist, wenn sie in den zweiten Pressspalt (12) eingebracht werden, die erste und zweite Musterwalze (5, 13) im Register zueinander laufen, sodass das erste und zweite bahnförmige flexible Material (1) in einem Muster entsprechend der Konfiguration der Oberseiten der erhabenen Abschnitte (6) der ersten Musterwalze (5) zusammengebracht und miteinander verklebt werden.

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass Klebstoff an Klebstoffstellen (17) auf die erste Lage (1) aufgebracht wird, die eine Fläche entsprechend zwischen 0,1 und 6 Prozent der Gesamtfläche des ersten bahnförmigen flexiblen Materials (1) bedecken.

3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Muster, das durch die erhabenen Abschnitte (14) der zweiten Musterwalze (13) bereitgestellt wird, eine größere Fläche aufweist als das durch die erhabenen Abschnitte (6) der ersten Musterwalze (5) bereitgestellte, sodass sich das Muster der zweiten Musterwalze (13) über die Klebstoffstellen (17), die durch die erste Musterwalze (5) bereitgestellt werden, hinaus erstreckt.

4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Klebstoff farbiger Klebstoff ist.

5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass wenigstens eine der Lagen (1, 10) vor der Lamination mit der gegenüberliegenden Lage mit einem dreidimensionalen Muster versehen wird, das auf der Lage vorgesehen wird, während sie nass ist, während dem Trocknen der nassen Lage und/oder in einem trockenen Zustand.

6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass wenigstens zwei Lagen (1, 10) vor der Lamination mit einem dreidimensionalen Muster versehen werden, wobei die Muster auf den wenigstens zwei Lagen mit unterschiedlichen Strukturen vorgesehen werden, wobei z.B. ein Muster relativ fein ist und das andere relativ grob.

7. Verfahren nach einem der vorstehenden Ansprüche, gekennzeichnet durch Verstärken wenigstens einer der Lagen mit Klebstoffstreifen oder härtenden Bindemitteln z.B. Latex.

8. Verfahren nach Anspruch 7, gekennzeichnet durch Härten der Bindemittel nach der Lamination.

9. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Größe jeder Klebstoffstelle (17) zwischen 0,15 und 150 mm², vorzugsweise zwischen 0,5 und 100 mm² und mehr bevorzugt zwischen 1 und 15 mm² beträgt.

10. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Größe jeder Klebstoffstelle (17) zwischen 150 und 400 mm² beträgt.

11. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Anzahl der Klebstoffstellen (17) pro Flächeneinheit zwischen 25 und 350.000 Klebstoffstellen pro m², vorzugsweise zwischen 300 und 180.000 Klebstoffstellen pro m² und mehr bevorzugt zwischen 800 und 50.000 Klebstoffstellen pro m² beträgt.

12. Mehrlagige Bahn (16) aus flexiblem Material wie beispielsweise Papier und Vliesstoff, umfassend wenigstens eine erste (1) und eine zweite Lage (10), die durch Verkleben an Klebstoffstellen (17), die ein Klebstoffmuster bilden, miteinander verbunden sind, dadurch gekennzeichnet, dass die Klebstoffstellen (17) eine Fläche entsprechend zwischen 0,03 und 9% der Gesamtfläche der Lage bedecken und über im Wesentlichen die gesamte Fläche der Lage spärlich verteilt sind und dass eine Außenfläche der mehrlagigen Bahn genau gegenüber den Klebstoffstellen (17) im Wesentlichen keine und die entgegengesetzte Außenfläche der mehrlagigen Bahn geringfügig verdichtende Prägungen (19) im Material aufweist, die in Verbindung mit dem Verbinden der Lagen (1, 10) entstehen.

13. Mehrlagige Bahn nach Anspruch 12, dadurch gekennzeichnet, dass die Klebstoffstellen (17) eine Gesamtfläche zwischen 0,1 und 6 % der Gesamtfläche der entsprechenden Lage (1, 10) einnehmen.

14. Mehrlagige Bahn nach einem der Ansprüche 12 oder 13, dadurch gekennzeichnet, dass die Größe jeder Klebstoffstelle (17) zwischen 0,15 und 150 mm², vorzugsweise zwischen 0,5 und 100 mm², und mehr bevorzugt zwischen 1 und 15 mm² beträgt.

15. Mehrlagige Bahn nach Anspruch 12 oder 13, dadurch gekennzeichnet, dass die Größe jeder Klebstoffstelle (17) zwischen 150 und 400 mm² beträgt.

16. Mehrlagige Bahn nach einem der Ansprüche 12 bis 15, dadurch gekennzeichnet, dass der Klebstoff an den Klebstoffstellen (17) farbig ist.

17. Mehrlagige Bahn nach einem der Ansprüche 12 bis 16, dadurch gekennzeichnet, dass wenigstens eine der Lagen (1, 10) ein dreidimensionales Muster aufweist, das vor dem Verbinden mit der gegenüberliegenden Lage vorgesehen wurde.

18. Mehrlagige Bahn nach Anspruch 17, dadurch gekennzeichnet, dass wenigstens zwei Lagen (1, 10) ein dreidimensionales Muster aufweisen, das vor dem Verbinden mit der gegenüberliegenden Lage vorgesehen wurde, wobei die Muster auf den wenigstens zwei Lagen unterschiedliche Strukturen aufweisen, wobei z.B. ein Muster relativ fein und das andere Muster relativ grob ist.

19. Mehrlagige Bahn nach Anspruch 17 oder 18, dadurch gekennzeichnet, dass die mehrlagige Bahn eine Außenseite mit relativ grober dreidimensionaler Struktur und eine Außenseite mit relativ glatter Struktur aufweist.

20. Mehrlagige Bahn nach einem der Ansprüche 17 bis 19, dadurch gekennzeichnet, dass die mehrlagige Bahn wenigstens drei Lagen mit einer Mittellage, die eine relativ grobe dreidimensionale Struktur aufweist, aufweist.

21. Mehrlagige Bahn nach einem der Ansprüche 12 bis 20, dadurch gekennzeichnet, dass wenigstens eine Lage mit Klebstoffstreifen oder härtenden Bindemitteln z.B. Latex verstärkt ist.

22. Mehrlagige Bahn nach einem der Ansprüche 12 bis 21, dadurch gekennzeichnet, dass wenigstens eine der Lagen (1, 10) Löcher aufweist.

23. Rolle, gefaltetes Handtuch, Lappen, Taschentuch, Windel und ähnliches aus bahnförmigem Material, dadurch gekennzeichnet, dass das bahnförmige Material eine mehrlagige Bahn nach einem der Ansprüche 12 bis 22 ist.

24. Rolle aus bahnförmigem Material nach Anspruch 23, dadurch gekennzeichnet, dass die Rolle eine kernlose Rolle ist, die von der Mitte abgerollt wird.

25. Produkt aus bahnförmigem Material nach Anspruch 23 oder 24, dadurch gekennzeichnet, dass das bahnförmige Material Tissuepapier ist.

Revendications

1. Procédé de production d'une bande multipli (14) en matériau flexible, comme du papier ou un matériau non tissé, par collage des couches,
caractérisé par les opérations consistant à :

amener un premier rouleau à dessin (5), comportant un dessin tridimensionnel où alternent des parties en relief (6) et des parties évidées (7), en contact avec un dispositif applicateur de colle (4), appliquer de la colle sur un premier matériau flexible en forme de bande (1) dans une première zone de pression (8) selon un dessin qui correspond à la configuration des sommets des parties en relief (6), la configuration du dessin du premier rouleau à dessin (5) est choisie de telle manière que de la colle est appliquée sur ladite première couche (1) dans des sites de colle (17) couvrant une aire correspondant à une valeur d'environ 0,03 à 9 % de l'aire totale du premier matériau flexible en forme de bande (1) et répartis de façon clairsemée substantiellement sur toute l'aire du premier matériau flexible en forme de bande (1), un deuxième matériau flexible en forme de bande (10) étant mis en contact avec le côté encollé dudit premier matériau flexible en forme de bande (1) dans une deuxième zone de pression (12) entre un deuxième rouleau à dessin (13) ayant un dessin tridimensionnel de parties en relief (14) et de parties évidées (15) alternées correspondant au dessin dudit premier rouleau à dessin (5) et un rouleau presseur (9), les tensions de bande desdites première et deuxième couches (1, 10) étant sensiblement égales pendant qu'elles sont amenées dans le deuxième zone de pression (12), les premier et deuxième rouleaux à dessin (5, 13) étant alignés l'un par rapport à l'autre, de sorte que les premier et deuxième matériaux flexibles en forme de bande (1) sont combinés et collés ensemble selon un dessin qui correspond à la configuration des sommets des parties en relief (6) dudit premier rouleau à dessin (5).

2. Procédé selon la revendication 1, caractérisé en ce que de la colle est appliquée sur ladite première couche (1) dans des sites de colle (17) qui couvrent une aire correspondant entre 0,1 % et 6 % de l'aire totale du premier matériau flexible en forme de bande (1).

3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le dessin fourni par les parties en relief (14) du deuxième rouleau à dessin (13) a une aire plus grande que celle fournie par les parties en relief (6) du premier rouleau à dessin (5), de sorte que le dessin du deuxième rouleau à dessin (13) s'étend à l'extérieur des sites de colle (17) fournis par le premier rouleau à dessin (5).

4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la colle est une colle colorée.

5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins l'une des couches (1, 10), avant superposition avec la couche opposée, est soumise à une mise en forme tridimensionnelle exercée sur la couche à l'état humide, pendant le séchage de la couche humide et/ou à l'état sec.

6. Procédé selon la revendication 5, caractérisé en ce qu'au moins deux couches (1, 10), avant superposition, sont soumises à une mise en forme tridimensionnelle, les dessins formés sur lesdites au moins deux couches ayant des structures différentes, par exemple un dessin étant relativement fin et un autre dessin étant relativement grossier.

7. Procédé selon l'une quelconque des revendications précédentes, caractérisé par le fait de renforcer au moins une couche avec des cordons de colle ou un liant de vulcanisation, par exemple du latex.

8. Procédé selon la revendication 7, caractérisé par le fait de durcir ledit liant après superposition.

9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la taille de chaque site de colle (17) est comprise entre 0,15 et 150 mm², de préférence entre 0,5 et 100 mm² et mieux encore entre 1 et 15 mm².

10. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la taille de chaque site de colle (17) est comprise entre 150 et 400 mm².

11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le nombre de sites de colle (17) par unité de surface est compris entre 25 et 350 000 sites de colle par m², de préférence entre 300 et 180 000 sites de colle par m² et mieux encore, entre 800 et 50 000 sites de colle par m².

12. Bande multipli (16) en matériau flexible, comme du papier ou un matériau non tissé, comprenant au moins une première (1) et une deuxième couche (10) qui sont reliées par collage au niveau de sites de colle (17) formant un dessin de colle,
caractérisée en ce que les sites de colle (17) couvrent une aire représentant de 0,03 à 9 % de l'aire totale de la couche et répartis de façon clairsemée substantiellement sur toute l'aire de la couche et en ce qu'une surface extérieure de ladite bande multipli juste en face des sites de colle (17) a substantiellement aucune et la surface extérieure opposée de ladite bande multipli a de légères impressions de compactage (19) dans le matériau fourni en association avec la jonction des couches (1, 10).

13. Bande multipli selon la revendication 12, caractérisée en ce que les sites de colle (17) occupent une surface totale représentant de 0,1 à 6 % de la superficie totale de la couche respective (1, 10).

14. Bande multipli selon la revendication 12 ou 13, caractérisée en ce que la taille de chaque site de colle (17) est comprise entre 0,15 et 150 mm², de préférence entre 0,5 et 100 mm² et mieux encore entre 1 et 15 mm².

15. Bande multipli selon la revendication 12 ou 13, caractérisée en ce que la taille de chaque site de colle (17) est comprise entre 150 et 400 mm².

16. Bande multipli selon l'une quelconque des revendications 12 à 15, caractérisée en ce que la colle des sites de colle (17) est colorée.

17. Bande multipli selon l'une quelconque des revendications 12 à 16, caractérisée en ce qu'au moins l'une des couches (1, 10) a un dessin tridimensionnel réalisé avant de la relier à la couche opposée.

18. Bande multipli selon la revendication 17, caractérisée en ce qu'au moins deux couches (1, 10) ont un dessin tridimensionnel réalisé avant de les relier à la couche opposée, les dessins formés sur lesdites au moins deux couches ayant des structures différentes, par exemple un dessin étant relativement fin et un autre dessin étant relativement grossier.

19. Bande multipli selon la revendication 17 ou 18, caractérisée en ce que la bande multipli a un côté extérieur ayant une structure tridimensionnelle relativement grossière et un côté extérieur ayant une structure relativement lisse.

20. Bande multipli selon l'une quelconque des revendications 17 à 19, caractérisée en ce que la bande multipli comporte au moins trois couches, avec une couche médiane ayant une structure tridimensionnelle relativement grossière.

21. Bande multipli selon l'une quelconque des revendications 12 à 20, caractérisée en ce qu'au moins une couche est renforcée de cordons de colle ou d'un liant de vulcanisation, par exemple du latex.

22. Bande multipli selon l'une quelconque des revendications 12 à 21, caractérisée en ce qu'au moins l'une des couches (1, 10) comporte des trous.

23. Rouleau, serviette pliée, torchon, mouchoir, serviette et objet similaire en matériau en bande, caractérisés en ce que ledit matériau en bande est une bande multipli selon l'une quelconque des revendications 12 à 22.

24. Rouleau de matériau en bande selon la revendication 23, caractérisé en ce que ledit rouleau est un rouleau sans noyau à alimentation centrale.

25. Produit en matériau en bande selon la revendication 23 ou 24, caractérisé en ce que ledit matériau en bande est du papier absorbant.

Drawing