ES2365452T3 - MULTI-PAPER MATERIAL OF PAPER GOFRADO AND MACHINE FOR THE PRODUCTION OF THIS. - Google Patents

Abstract

The multi-ply material in tissue paper comprises at least one first outer ply (V1) and at least one second outer ply (V2), wherein said first and said second outer ply are embossed with first protuberances with linear development (5) facing towards the inside of the material and arranged in a tip-to-tip arrangement, and with second protuberances (9) facing towards the inside of the material and defining a background motif. Between the first outer ply and said second outer ply are arranged a third ply (V3) and a fourth ply (V4).

Description

Technical field

The present invention relates to improvements in multilayer materials made of paper, in particular the so-called tissue paper, for example, for the production of absorbent products, toilet paper, kitchen paper and the like.

State of the art

In the field of processing and manufacturing tissue paper it is well known to produce multilayer products, in which two or more embossed layers of tissue paper are joined together by lamination and bonding according to different techniques.

For example, US-A-3961119 describes a two-layer material, in which the two layers are embossed separately with helical configurations with different inclinations and are coupled at the intersection of the helical configurations.

US-A-6470945 describes a machine for embossing layers that, once joined together, form a continuous web material with layers coupled end to end or chained respectively. The end-to-end connection is provided a joint, in which the protuberances of one layer are at least partially in correspondence with the protuberances of the other layer. Vice versa, the chained joint is provided for a joint, in which the protuberances of one layer are chained between the protuberances of the other layer.

Other embossed multilayer products and devices for the production of these are described and illustrated, for example, in US-A-6261666, US-A-6109326, US-A-2003/0102096, US-A-6136413, WO -A-00/78533, USA-6681826, US-A-3414459, US-A-5173351, US-A-6032712, US-A-6245414, WO 99/44814.

US-A-4,320,162 describes a multilayer product with two embossed layers with the same embossing on both sides, that is, on both layers. The embossments are arranged from end to end and are formed by large protuberances with a large frontal surface, among which protrusions with a lower height and smaller dimension are arranged.

Embossed multilayer materials must satisfy a plurality of requirements that frequently contrast with each other, such as in particular: softness, absorption capacity, thickness, mechanical strength also when soaked with a liquid, ability to remove materials from cleaned surfaces using embossed paper , and also other requirements.

There is a constant search in order to identify techniques for embossing, rolling and bonding layers, which allow optimizing the performance of these materials from many points of view, which also contrast each other. Summary of the Invention

According to one aspect, an object of the present invention is to provide a multilayer paper continuous web material, in particular formed by a plurality of layers of a material made of embossed tissue paper, which has improved characteristics with respect to traditional products. , at least one or some aspects.

According to one embodiment, the multilayer material made of embossed tissue paper according to the present invention comprises at least a first outer layer and at least a second outer layer bonded to the other in correspondence with first protrusions obtained on one and on the other of said layers and oriented inwards. The joint is of the end-to-end type, that is, a joint in which the protuberances obtained in a first layer are in correspondence with the protuberances obtained in the other layer. Preferably, two inner layers are arranged between the two outer layers, one of which, or both, is preferably embossed. Contrary to traditional end-to-end products, in accordance with the present invention (in addition to a first series of end-to-end joined protrusions obtained both in the first and second outer layers, and having a linear development to form configurations decorative with a large surface extension) each of the two outer layers also provides a second series of protrusions, also oriented inwards and defining a background pattern, which is preferably constituted by a plurality of protrusions with a simple geometric shape, by example, and in particular truncated or truncated pyramid shapes.

The layers are joined together by bonding and lamination in correspondence with at least the protrusions with linear development of the first and second layers.

According to an advantageous embodiment, the protuberances with truncated pyramids, truncated conical or with a simple geometric shape, which define the embossing pattern, have a frontal surface of the protuberances equal to or less than 4 mm2.

Preferably, the bottom protuberances have a density between 2 and 25 and more preferably between 3 and 8 protuberances / cm2.

According to some advantageous embodiments, the first embossing protuberances or at least some of them, both in the first and second outer layers, preferably define closed lines, within which areas or sections of the respective layers are demarcated, devoid of or substantially devoid of embossing, that is, smooth areas. Preferably, these areas form swellings that are oriented outwardly of the multilayer material.

Preferably, according to some embodiments, at least the third layer and preferably both the third inner layer and the fourth inner layer of the multilayer material are embossed.

The embossments obtained on the third and / or on the fourth inner layer are formed by protrusions oriented outwards, that is, oriented respectively towards the first and second outer layers of the multilayer material.

In order to obtain a product with a greater thickness, which does not tend to press or sink during packaging, for example during roller winding, the geometric protrusions of the third layer and the fourth layer disposed within the first outer layer and the second outer layer is preferably arranged, at least in some of the areas or areas devoid of embossing delimited by the linear embossing protrusions of the first layer and the second layer, so that they support these areas devoid of embossing and maintain them swollen and prologue towards the outside of the multilayer material.

In this way, a particular soft material is obtained with a large apparent thickness and with an appearance of great aesthetics, thanks to the wide embossing configuration delimited by the protuberances with linear development of the two outer layers. The thickness of the material is also maintained when the material is rolled, for example, to form rolls of kitchen paper, thanks to the presence of the geometric protuberances of the two inner layers that are arranged within the non-embossed areas delimited by the protuberances linear of the two outer layers, that is to say, they are chained between said linear protuberances.

Other features and advantageous embodiments of a multilayer material according to the present invention are set forth in the appended claims and will be described in greater detail with reference to some non-limiting embodiments of the invention.

According to another aspect, the invention also relates to an embossing machine or unit for the production of a continuous web material as defined above.

Basically, in one embodiment of the invention the machine comprises a first embossing roller and a second embossing roller, which cooperate with a respective first pressure roller and a second pressure roller and each provided with first protrusions with linear development. , the first protuberances of the first and the second roller being arranged in an end-to-end arrangement. Each of the first and second embossing roller comprises second protuberances that define a background motif. Brief description of the drawings

The invention will be better understood from the following description and the accompanying drawings, which show practical non-limiting embodiments of the invention. More in particular, with reference to the drawings attachments:

Figure 1 shows a plan view of a section of a continuous web material in accordance with the present invention; Figure 2 shows a schematically enlarged section according to line II-II of Figure 1; Figure 3 shows a scheme of an embossing machine or unit for the production of a web material continuous of the type illustrated in Figures 1 and 2.

Detailed description of embodiments of the invention

Figure 1 shows a top view of a section of a multilayer material according to the present invention, indicated as a set with the number 1. Figure 2 shows a schematic and greatly enlarged cross section, in accordance with line II-II of Figure 1, of the material 1, from which it is evident that the material is formed by four layers and precisely: a first outer layer V1, a second outer layer V2, a third inner layer V3 disposed between layers V1 and V2 , and a fourth inner layer V4, also disposed between layers V1 and V2. More precisely, layer V3 is disposed between layer V1 and V4, and layer V4 is disposed between layer V3 and layer V2.

According to an advantageous embodiment, the outer layers V1 and V2 are embossed with an end-to-end configuration, that is, in such a way that the protrusions of the layer V1 have the same shape or substantially the same shape as the protrusions of the layer V2 and correspond to each other, with an arrangement in which the frontal surfaces of the protuberances of one layer are in correspondence with the frontal surfaces of the protuberances with the same shape of the other layer.

According to an advantageous embodiment, first protuberances are provided on both the layer V1 and on the layer V2, indicated respectively with the number 5 and 7 for layers V1 and V2, which have a linear development, that is, an extension of greater dimension in relation to the transverse dimension. In some embodiments each protuberance 5, 7 has a length at least 10 and preferably 20 times and more preferably 50 times greater than the transverse width dimension of the protuberance itself.

According to some preferred embodiments, the protuberances 5 and the corresponding protuberances 7 or at least some of them have a closed shape, that is, said shape defines areas, indicated with the letter A in Figure 1, which are completely or practically completely enveloped by respective linear protuberances 5, 7. In some embodiments, the areas A thus delimited are devoid of embossing, that is, they are substantially smooth, that is, devoid of protuberances. These are preferably swollen, that is, they protrude outward from the multilayer material 1, forming a type of projections, bubbles or swellings, while the protuberances 5 and 7 are oriented inwards of the multilayer material 1.

In addition to the protrusions or linear protuberances 5, 7, each layer V1, V2 has additional protrusions 9, 11, which are also arranged in a configuration preferably from end to end and, as shown in Figure 1, with a geometric shape simple. In some embodiments, the protrusions 9, 11, which are oriented again towards the interior of the multilayer material 1, have truncated pyramidal or truncated conical shapes, with a frontal surface preferably less than 4 mm2.

In some embodiments, as shown in Figures 1 and 2, the inner layers V3 and V4 are provided with respective protrusions 13, 15 facing outward, that is, the protrusions 13 provided in the layer V3 that is oriented towards the layer outer V1 and the protuberances 15 provided in the layer V4 oriented towards the outer layer V2. In some embodiments, the protrusions of layers V3 and V4 have varying heights, as shown for example in the embodiment of Figure 2. In this case, protrusions or protuberances 13 and protrusions 13X, with respective height are provided on the layer V3 H and h, and on the V4 layer 15X and 15 bulges are arranged with the height H and h.

In some embodiments, a plurality of protrusions 13 of layer V3 and protuberances 15 of layer V4 are arranged in correspondence with areas A of layers V1 and V2 delimited by linear protuberances 5, 7. Thus, swells formed in the zones or areas A delimited by the linear protuberances 5, 7 are supported by the protuberances 13, 15 formed by the inner layers V3, V4 and oriented towards the outside, arranged in an arrangement chained within the linear protuberances 5, 7. This facilitates the maintenance of the entire thickness, indicated by the letter S, of the multilayer material 1 also if the latter is rolled to form for example a roll of kitchen paper, bathroom paper or the like.

To simplify the drawings, in Figure 2 the protrusions 13X are shown only at the right angle to the base, where the layer V1 is raised so that it shows the embossed structure below. Vice versa, in the smooth areas A wrapped by the protuberances 5, the protuberances 13 of the layer below are shown with a dashed line, so that they show how they are arranged to withstand the layers of layer in the areas A without embossing.

The protrusions 13X, 15X may have a lower height than the protuberances 13, 15, as shown in Figure 1, since they do not have to perform a specific support function. However, it is possible that the protrusions or protrusions 13X, 15X have a height equal to the height H of the protuberances 13, 15.

Finally, with such a configuration, it is possible to obtain a very thick and very soft material, which is resistant to compression or sinking, with very detergent characteristics thanks to the presence of protuberances 5, 7 with linear development that define, on the outer surface of the layer 1 material, linear cavities to collect the impurities, such as, for example, dust, liquid or others, collected from the surfaces that are cleaned with the material 1.

Advantageously, the layers V1 and V2 are glued together by lamination in correspondence with the protuberances 5, 7, and 9, 11, in an end-to-end arrangement, all these protuberances having the same height or at least the protuberances 5, 9 having the same height and similarly the protuberances 7, 11 having the same height. In a modified embodiment, the height of the protuberances 9, 11 may be different, and in particular, less than the height of the protuberances 5, 7.

The protrusions 13, 15 can be distributed with a variable density, for example, the protuberances 13, 15 with a density greater than that of the protuberances 13X, 15X, so that it forms a more effective support for the swollen areas A.

In some embodiments, the protuberances 13, 15 and / or the protuberances 13X, 15X can have a density between 5 and 10 protuberances / cm2.

The dimensions of the protuberances 13, 15 and 13X, 15X may be such that they define surface areas on the upper ends (that is, they are oriented outwards) of the protuberances equal to or less than 4 mm2.

A multilayer material 1 of the type described above can be obtained, for example, with a machine or embossing unit of the type shown schematically in Figure 3 and indicated as a set with the number

20. In some embodiments, the embossing unit comprises a first embossing roller 21 and a second embossing roller 23 provided with engravings as mirrors so that they emboss in an end-to-end arrangement and laminate the first outer layer V1 with the second outer layer V2 of the multilayer continuous web material 1.

The surface configuration of the rollers 21 and 23 substantially reproduces the shape of the protuberances 5, 9 for one of the rollers and 7.11 for the other roller.

The embossing rollers 21 and 23 cooperate with respective pressure rollers 25, 27, for example, coated with rubber or other material with elastic deformation so that the layers V1 and V2 supplied along each other are embossed separately from each other. respective feed paths around the pressure rollers 25, 27 and in the groove between the rollers 25, 21 and 27, 23 respectively.

Between the embossing rollers 21 and 23 a rolling groove 29 is defined, through which the embossed layers V1, V2 pass and in correspondence of which said layers are mutually laminated by gluing them thanks to the glue applied by one or the other of the two tail dispensing units 31, 33.

In addition to the pairs of pressure and embossing rollers 21, 25 and 23, 27, the embossing unit 20 comprises an additional third embossing roller 35 and a fourth embossing roller 37, cooperating respectively with a third pressure roller 39 and a fourth pressure roller 41, coated with a material with elastic deformation, such as rubber or others.

The third layer V3 and the fourth layer V4 are supplied along respective paths through the embossing unit 20, and are embossed separately in the grooves defined respectively between the pressure roller 39 and the embossing roller 35 and between the Pressure roller 41 and pressure roller 37. Embossing rollers 35, 37 have engravings with protrusions corresponding to protrusions 13, 13X and 15, 15X generated by the rollers in the inner layers V3 and V4. As shown in the diagram of Figure 3, the arrangement of the rollers is such that the protrusions of the rollers 35 and 37 generate in the layers V3 and V4 corresponding protrusions oriented towards the layers V1 and V2 in the groove between the pairs of the rollers 21, 35 and 23, 27. In this way the protuberances 13, 13X generated by the embossing roller 35 and the protuberances 15, 15X generated by the embossing roller 37 are oriented outwardly of the multilayer material 1.

The arrangement of two glue dispensing units 31, 33 allows the glue to be applied on the protuberances 5, 9 obtained on the layer V1 by means of the dispensing unit 31 and on the protuberances 7, 11 generated on the layer V2 by the embossing roller 23 by means of the glue dispensing unit 33, so that it has a sufficient amount of glue to engage by lamination in the groove 29 the four layers V1, V2, V3 and V4 with each other.

It is understood that the drawings only show an example provided by way of a practical arrangement of the present invention, which may vary in forms and arrangements without thereby departing from the scope of the concept of the invention.

Claims (15)

one.

A multilayer tissue paper material (1) comprising at least a first outer layer (V1) and at least a second outer layer (V2), wherein said first and second outer layer are embossed with first protrusions (5, 7) with linear development oriented towards the interior of the material and arranged from end to end, and with second protrusions (9, 11) oriented towards the interior of the material and defining a background motif, and in which between said first outer layer and said Second outer layer a third layer (V3) and a fourth layer (V4) are arranged.

2.

Material according to claim 1, wherein the second protuberances (9, 11) of the first and second outer layer (V1, V2) are positioned in an end-to-end arrangement.

3.

Material according to claim 1 or 2, wherein said two outer layers (V1, V2) are bonded together in correspondence with at least said first linear protrusions (5, 7).

Four.

Material according to claim 1, 2 or 3, wherein said second protuberances (9, 11) have a truncated conical or truncated pyramidal shape, with a frontal surface at the top equal to or less than 4 mm2.

5.

Material according to one or more of the preceding claims, wherein at least some of the first protuberances (5, 7) of said first and second outer layer (V1, V2) define at least partially closed lines, within which they are defined correspondingly substantially non-embossed areas (A) of the respective outer layer (V1, V2).

6.

Material according to claim 5, wherein said substantially non-embossed areas (A) form swellings protruding outward from the respective outer layer (V1, V2).

7.

Material according to one or more of the preceding claims, wherein the second protuberances (9, 11) of the outer layers (V1, V2) have a density between 1 and 25 protuberances / cm2 and preferably between 3 and 8 protuberances / cm2 .

8.

Material according to one or more of the preceding claims, wherein said third and fourth layers (V3, V4) are embossed with a background pattern (13, 13X, 15, 15X), preferably constituted by embossing protrusions that are oriented towards the respective outer layers.

9.

Material according to claim 8, wherein a plurality of embossing protuberances (13, 13X, 15, 15X) of each of said third and fourth layers (V3, V4) are arranged within non-embossed areas (A) defined by corresponding protrusions (5, 7) with linear development of the respective outer layer (V1, V2), constituting reinforcement elements in order to avoid or reduce the compression of the areas delimited by said linear protuberances (5, 7).

10.

Material according to claim 9, wherein said protuberances (13, 13X, 15; 15X) of the third and fourth layer (V3, V4) have at least two different heights, the protuberances being higher (13, 15 ) preferably disposed within said non-embossed areas (A) defined by said linear protuberances (5, 7) of the respective first and second outer layer (V1, V2).

eleven.

Material according to one or more of the preceding claims, wherein said layers are glued with a colored glue.

12.

A machine for the production of a multilayer tissue paper material, comprising a first embossing roller (21) and a second embossing roller (23) cooperating with a respective first pressure roller (25) and a second pressure roller (37), and each of them provided with first protuberances with linear development, the first protuberances of the first and the second roller being arranged in an end-to-end arrangement, and in which each of said first and second embossing roller It comprises second protuberances that define a background pattern.

13.

Machine according to claim 12, wherein said second protuberances have a frontal dimension equal to or less than 4 mm2.

14.

Machine according to claim 12 or 13, comprising a third embossing roller (35) and a fourth embossing roller (37), cooperating with a respective third pressure roller (39) and a fourth pressure roller (41), being said third and fourth embossing rollers (35, 37) provided with protuberances arranged such that the embossing generated by the third and fourth embossing roller (35, 37) on the respective third and fourth layers (V3, V4) are arranged in correspondence with areas delimited by linear protuberances on the first and second embossing roller (21, 23) on a first and second layer (V1, V2).

fifteen.

Machine according to claim 14, comprising two gluing units.