DE29623637U1 - Product mainly made of cellulose for the hygiene sector - Google Patents

Description

SCA Hygiene Products GmbH Sandhofer Str. 176

D-68264 Mannheim

Product consisting mainly of cellulose for the hygiene sector

The invention relates to a product consisting predominantly of cellulose for the hygiene sector, in particular a hygiene cellulose cloth with at least two layers of tissue or non-woven or a layer composite thereof that are to be connected to one another and an embossed pattern consisting of a large number of individual embossings that deform the layers transversely to the layer surface and connect them to one another, each of which emanates from the outer surfaces of the layers and is concavely curved inwards, the layer adhesion being provided by the embossed pressure. The product is intended in particular as a handkerchief or napkin.

Such a product is known from DE-GM 94 06 026. There, the embossings are formed by embossing points that are concavely curved inwards and start from the two outer tissue layers, which are aligned with each other transversely to the direction of the layers and in whose head-to-head bottom areas the tissue layers are connected to each other by an embossing effect.

It is the object of the invention to create a hygiene cellulose cloth which, in a different way, has an improved embossing compared to the so-called wild or union embossing, in such a way that the cellulose cloth can also be used in the

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The embossed area used to create layer adhesion feels soft and smooth.

This object is achieved according to the invention in that adjacent impressions, which are curved inwards from opposite sides (surfaces) of the cellulose cloth, are arranged offset from one another in the layer direction in such a way that the bottom of an impression, which starts from the outer surface of one side of the cellulose cloth, is connected to the non-embossed wall of the outer surface of the other side by an embossing effect, and vice versa for the adjacent impression.

Although the bases of the embossings are on the respective outer sides of the cellulose cloth, surprisingly there are almost no protruding embossing areas on the outside of the cellulose cloth that would impair a smooth surface, so that the cloth is very soft and skin-friendly. Due to this design, the embossings can be provided in any design over practically the entire surface of the cellulose cloth.

The embossings are expediently designed as embossed dots, embossed lines or combinations thereof, which can be arranged in a large number to create a pattern or motif, also in combination with lettering. The embossed patterns can be designed over an edge area of the cloth, but also over the entire cloth.

According to a further embodiment of the invention, the adjacent impressions provided by opposing surfaces are at least partially so close to one another that their adjacent wall sections are connected to one another by an embossing effect (layer adhesion). As a result, the area in which layer adhesion is achieved by

embossing, without affecting the softness of the product.

The problem is also solved by a device for producing such a hygiene cellulose cloth. This device has, in addition to the usual components, a pair of steel embossing rollers between which the layers converge. The embossing knobs of the embossing rollers mesh with one another in an offset manner, with the tips of the embossing knobs moving closely but without contact with the base made of steel, ceramic or similarly hard material between the embossing knobs of the respective counter roller. Surprisingly, this modified "nested" process leads to a cellulose cloth that is essentially free of raised embossing areas when the embossing knobs mesh with one another in an offset manner against a base made of steel or similarly hard material between the embossing knobs of the respective counter roller, with the tissue layers interposed.

In an advantageous further development, the device is characterized in that additional deflection rollers or elastic pressure rollers are assigned to the embossing rollers in such a way that the layers can be fed separately to the embossing gap of the embossing rollers and that a moistening device for moistening the individual layers is arranged upstream of the embossing gap. This can significantly improve the embossing effect and in particular the layer adhesion.

The invention is explained in more detail below using exemplary embodiments shown purely schematically in the drawings. They show:

Fig. 1 is a plan view of a section of a sanitary cellulose wipe;

Fig. 2a - 2c sectional views along the line A-A in Fig. 1 with different arrangements of the impressions;

Fig. 3 is a schematic sectional view of the embossing rollers with a continuous web of the hygiene cellulose tissue;

Fig. 4 is an enlarged partial cross-sectional view through the embossing rollers and in particular the embossing gap of these rollers;

Fig. 5a shows another arrangement of the embossing device with a water spray device;

Fig. 5b shows a device similar to Fig. 5a, but with a water coating device;

Fig. 6a a view of a hygiene cellulose tissue as a paper handkerchief;

Fig. 6b a view of a hygiene cellulose wipe with the front side embossing; and

Fig. 6c a view of a hygiene cellulose wipe with the back embossing.

As already explained, Fig. 1 shows a section of a web of a hygiene cellulose cloth 1 in view, namely the front side, which is provided with embossings 2. The embossings 3 made on the back side are shown in dashed lines. An arrow 4 indicates the direction in which the web passes through the embossing device. Purely as an example, this hygiene cellulose cloth consists of four layers 5, 6, 7 and 8 of the same thickness. The layers can also be constructed in layers, in accordance with conventional manufacturing processes with multi-layer headboxes. The cross section according to Fig. 2c corresponds to the representation in Fig. 1. There, as in Figs. 2a and 2b, the embossings 3 on the back side and the embossings 2 on the front side are clearly visible. In the area of the bottom 9 of the impressions and in the area of the adjacent free surface 10 of the other side of the product, the layers are significantly reduced in thickness by the embossing pressure in such a way that there is a layer adhesion through the embossing pressure in which the fibers are pressed together in such a way that physical-chemical bonds (hydrogen bonds) occur between the individual fiber surfaces. In the present case, the impressions are point-shaped or circular with a diameter d in the bottom area. The entire product has a thickness D. The area of the layers compressed in the bottom area of the impressions has a thickness s that is significantly smaller than the sum of the non-compressed layers. The distances A of the impressions 2, 3 in the product according to Fig. 2c are selected so that a compression of the layer by the embossing pressure only occurs in the mentioned bottom areas of the impressions and on the outside of the other surface. In the embodiments according to Fig. 2a and 2b, the distance a between some of the impressions and 3 is such that in the adjacent wall areas 11 the layers are also compressed by embossing, in the sense of layer adhesion.

Fig. 3 shows schematically two embossing rollers 12, 13, which rotate in the same direction according to arrows 14, 15, whereby the material web M, which here consists of four layers, runs through from right to left according to arrow 4. As it runs through, the embossing rollers 12 and 13 exert an embossing pressure on the web M, which is shown by the arrows P. This device is shown in more detail in the area of the embossing gap in Fig. 4. The arrows ρ make the embossing pressure applied to the layers even clearer. This embossing pressure is exerted by the nubs N1 against the steel roller base 16 between the nubs N2 of the embossing roller 13. The base area of the embossings, which causes the layer adhesion through embossing pressure, is marked with the reference number 17 in Fig. 4. The center line of the product is marked with the reference number 18. To increase the service life, the embossing rollers can consist of a clamping core and a sleeve that carries the embossing nubs.

Fig. 5a and 5b show a modified embodiment in which the material web does not enter the embossing gap in four layers. Instead, pressure rollers 21 and 22 are assigned to the embossing rollers 12 and 13 in such a way that, for example, a two-layer partial web M1 and a two-layer partial web M2 are deflected over these rollers 21 and 22 and enter the embossing gap along the circumference of the embossing rollers 12 and 13. The embossing gap is therefore open for a moistening device 19, via which the webs M1 and M2 in the area of the embossing gap are pre-moistened using a water jet device or steaming (steam) device 20 so that the embossing process can be carried out more effectively and intensively, particularly with regard to the layer adhesion. The embossing rollers can be heated or cooled. Excess water can be easily removed by heating the paper web. Cooling can improve the precipitation of water vapor. This can

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Water application can be better controlled in terms of the application quantity.

In the embodiment according to Fig. 5b, this moistening device is slightly modified in such a way that each embossing roller 12, 13 is assigned a moistening roller arrangement 25, which dips into a water container 26 and moistens the material webs M2 and M1 past in the peripheral area of the embossing rollers 12, 13.

Using a paper handkerchief, the manufactured product is shown in Fig. 6a, 6b and 6c. Fig. 6a shows the pattern created by the embossing on the front and back. Fig. 6b shows the embossed pattern on the front and Fig. 6c shows the embossed pattern on the back. As mentioned, both combine to form an embossed pattern as shown in Fig. 6a.

Although the indentations 2, 3 are located with their bottoms on the outside of the other surface, surprisingly, each surface has such a smooth surface that the surface feels soft, even if indentations are provided over the entire surface.

The basis weight of the individual layers is preferably 12 to 45 g/m ² , whereby 2 to 8 layers can be bonded together. The basis weight of the entire cloth is preferably 24 to 150 g/m ² . The thickness of the cloth is preferably in the range from 0.15 mm to 1.5 mm. The dry strength of a four-layer cloth along the running direction is preferably in the range of 15 N/50 mm strip width, but can be in the range of 15 to 40 N/50 mm strip width. The corresponding dry strength in the transverse direction is 3 to 10 N/50 mm strip width. In contrast, the wet breaking strength according to DIN is 2 to 10 N/50 mm strip width in the longitudinal direction and 0.5 to 5 N/50 mm strip width in the transverse direction.

Claims (7)

sayings 1. Product consisting predominantly of cellulose for the hygiene sector, in particular a hygiene cellulose cloth with at least two layers (5, 6, 7, 8) made of tissue or non-woven or a layer composite thereof that are to be connected to one another and an embossed pattern consisting of a large number of individual impressions (2, 3) that deform the layers transversely to the layer surface and connect them to one another, each of which emanates from the outer surfaces of the layers and is concavely curved inwards, the layer adhesion being provided by the embossed pressure, characterized in that the adjacent impressions (2; 3), which are curved inwards from opposite sides (surfaces) of the product, are arranged offset from one another in the layer direction in such a way that the bottom (9) of an impression (2; 3), which starts from the outer surface of one side of the cellulose cloth, is connected to the non-embossed wall (10) of the outer surface of the other side of the product by an embossing effect (layer adhesion) and vice versa for the adjacent impression. 2. Product according to claim 1,
characterized in that the impressions (2; 3) are embossing points. . Product according to claim 1, characterized in that the impressions (2; 3) Embossing lines are. · 4. Product according to claim 1, characterized in that the impressions are a combination of embossed points and embossed lines. 5. Product according to at least one of claims 1 to 4, characterized in that the embossed pattern is formed over an edge region of the cloth. 6. Product according to at least one of claims 1 to 5, characterized in that the adjacent impressions (2; 3) provided by opposite surfaces are at least partially located so close to one another that their adjacent wall sections (11) are connected to one another by an embossing effect (layer adhesion). 7. Device for producing a product according to at least one of claims 1 to 6, characterized in that a pair of steel embossing rollers (12, 13) is provided, between which (embossing gap) the layers converge as a material web (M), and that the embossing nubs (Nl, N2) of the embossing rollers (12, 13) engage with one another in an offset manner and the tips of the embossing nubs move close to, but without contact with, the base (16) made of steel, ceramic or a similar hard material between the embossing nubs (Nl, N2) of the respective counter-roller. Device according to claim 7,
characterized in that the embossing rollers (12, 13) are assigned additional deflection rollers or elastic pressure rollers (21, 22) in such a way that the layers (Ml; M2) can be fed separately to the embossing gap of the embossing rollers (12, 13), and that upstream of the embossing gap a moistening device (19, 20; 25, 26) is arranged for moistening the individual layers (Ml; M2).