DE19654249A1 - Cellulose hygiene product e.g. paper handkerchiefs or napkins - Google Patents

Abstract

A hygiene product made up of cellulose, especially a cellulose hygiene cloth, has at least two layers (5,6,7,8) of tissue, nonwoven material, or multi-ply of layers thereof which are bonded to one another by means of an embossed pattern consisting of a large number of individual indentations (2,3) which deform the layers in a direction perpendicular to their surfaces and which bind the layers together. The indentations are concave and extend inwards from the surfaces of the cloth, and the bonding strength is set by the embossing pressure. Adjacent indentations, which project inwards alternately from opposite sides of the product and are offset with respect to one another in such a way that the base surface (9) of each indentation (2,3) extending from the outer surface of one side of the product is bonded by ply adhesion to the unembossed wall (10) of the outer surface of the other side of the cloth, whilst the arrangement is the inverse for the indentation next to it. Also claimed is an arrangement for making the claimed product. A pair of rotating steel rolls enclose a gap between them through which the product is passed. The rolls each have embossing studs arranged so that the studs on one roll extend into the space between the studs on the other, and the tips of the studs on one roll pass very close to but do not touch the steel, ceramic or other hard material in the spaces between the studs on the opposite roll.

Description

The invention relates to a mainly made of cellulose existing product for the hygiene sector, in particular a Hygiene tissue with at least two together connecting layers of tissue or non-woven or one Layer combination of it and an embossing pattern consisting of a variety of individual, the layers across Layer surface deforming and connecting Impressions, each of the outer surfaces of the Layers run out and are concave inwards, the Layer adhesion is given by the embossing. The product is especially intended as a handkerchief or napkin.

Such a product is known from DE-GM 94 06 026. There are the impressions based on the two outer tissue layers concave inwards Embossing points are formed, which are transverse to each other aligned and in their head-to-head floor areas the tissue layers are connected by embossing are.

It is an object of the invention to provide a hygiene tissue create that in a different way from the one so-called wild or union coinage improved coinage has such that the cellulose cloth is also in the  the embossing area serving to generate layer adhesion is soft and feels smooth.

This object is achieved in that neighboring impressions, from opposite sides (Surfaces) of the cellulose cloth are curved inwards, are arranged offset to one another in the layer direction, that each is the bottom of an imprint made by the outer Surface of one side of the tissue comes out with the not embossed wall of the outer surface of the other Side is connected by embossing effect, and vice versa for the neighboring imprint.

Although the bottoms of the impressions on the respective Appear on the outside of the tissue surprisingly on the outside of the cellulose cloth almost no protruding embossed areas that have a smooth Surface would affect, making the cloth very soft and is kind to the skin. Thus the impressions due to this configuration practically over the entire Surface of the cellulose cloth in any design be provided.

The embossments are expediently used as embossing points, Embossed lines or combinations thereof, which are in a multitude to produce a pattern or motif too be lined up in combination with lettering can. The embossing pattern can be done over an edge area of the cloth, but also be formed over the entire cloth.

According to a further embodiment of the invention, the provided by opposite surfaces and neighboring impressions at least partially so dense together that their adjacent wall sections through Embossing effect (layer adhesion) are interconnected. This will make the area where layer adhesion occurs  Embossing is evoked, enlarged without the softness of the product.

In addition, the object is achieved by a device for Manufacture of such a hygiene tissue. This In addition to the usual components, the device has a pair of steel embossing rollers, between which the layers converge. The embossing knobs on the embossing rollers grip offset, with the tips of the embossed knobs tight, but non-contact to steel, ceramic or similar hard material formed between the embossed knobs move the respective counter roller. Surprisingly leads this modified "nested" process to one of sublime above embossed areas essentially free Cellulose cloth if the interlocking Embossed knobs against one made of steel or similar hard Material formed base between the embossed knobs respective counter roller, and under Interposition of the tissue layers.

The device is in an advantageous development characterized in that the embossing rollers additional Deflection rollers or elastic pressure rollers assigned in this way are that the layers separate the embossing gap of the embossing rollers are available and that upstream of the embossing gap Humidification device for humidifying the individual Layers is arranged. The embossing effect and In particular, the layer adhesion can be significantly improved.  

The invention is described below with reference to the drawings embodiments shown purely schematically explained. Show it:

Figure 1 is a plan view of a portion of a hygiene tissue.

2a-2c are sectional views along the line AA in Figure 1 with different arrangements of embossments..;

Fig. 3 is a schematic sectional view of the embossing rollers with a continuous path of the hygiene cell cloth;

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

5a shows a different arrangement of the embossing device with a Wasserbesprühungsvorrichtung.

5b shows a similar device of Figure 5a, but with a water coating apparatus..;

FIG. 6a is a view of a hygienic cellulose cloth as a paper handkerchief;

Figure 6b is a view of a hygienic cellulose cloth with the Vorderseitenbeprägung. and

Fig. 6c is a view of a hygiene tissue with the back embossing.

In Fig. 1, as already stated, a section of a web of a hygiene tissue 1 is shown in view, namely the front, which is provided with embossments 2 . The impressions 3 made from the back are shown in dashed lines. An arrow 4 indicates the direction of travel of the web through the embossing device. Purely for example, this hygiene tissue consists of four layers 5 , 6 , 7 and 8 of the same thickness. The layers can also be constructed in layers, specifically in accordance with conventional manufacturing processes with multilayer headboxes. The representation in FIG. 1 corresponds to the cross section according to FIG. 2c. There, as in FIGS. 2a and 2b, the impressions 3 on the back and the impressions 2 on the front are clearly recognizable. In the area of the bottom 9 of the embossments and in the area of the adjacent free surface 10 of the other side of the product, the layers are considerably reduced in thickness by the embossing pressure in such a way that there is layer adhesion by the embossing pressure in which the fibers are pressed together 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 base area. The entire product has a thickness D. The area of the layers compressed in the base area of the embossments has a thickness s which is considerably smaller than the sum of the layers not compressed. The spacing A of the impressions 2 , 3 in the product according to FIG. 2c is selected such that the position is compressed by the embossing pressure only in the bottom areas of the impressions mentioned and on the outside of the other surface. In the embodiments according to FIGS. 2a and 2b, the spacing a of some impressions 2 and 3 is such that the layers in the adjacent wall areas 11 are also compressed by embossing, in the sense of layer adhesion.

Fig. 3 shows schematically two embossing rollers 12 , 13 which rotate according to the arrows 14 , 15 in the same sense, the material web M, which here consists of four layers, passes from right to left according to arrow 4 . During the passage, the embossing rollers 12 and 13 exert an embossing pressure on the web M, which is represented by the arrows P. This device is shown in more detail in the region of the embossing gap in FIG. 4. The arrows p illustrate the embossing pressure applied to the layers even more clearly. This embossing pressure is exerted by the knobs N1 against the steel roller base 16 between the knobs N2 of the embossing roller 13 . The bottom area of the embossments which causes the layer adhesion by means of embossing pressure has the reference symbol 17 in FIG. 4. The center line of the product is provided with the reference symbol 18 . To increase the service life, the embossing rollers can consist of a clamping core and a sleeve bearing embossing knobs.

FIGS. 5a and 5b show a modified embodiment in which the material web enters not four layers in the embossing gap. Rather, the embossing rollers 12 and 13 are assigned pressure rollers 21 and 22 such that, for example, a two-layer partial web M1 and a two-layer partial web M2 are deflected via these rollers 21 and 22 and run into the embossing gap along the circumference of the embossing rollers 12 and 13 . Thereby, the embossing gap open to a moistening device 19 are provided with a water jet device or steaming (steam) device 20, the paths M1 and M2, pre-wetted in the area of the embossing gap, so that the embossing operation can be more effectively and intensively in particular in view of the ply bonding made. 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. As a result, the water application can be better controlled with regard to the application quantity.

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

The manufactured product is shown in FIGS. 6a, 6b and 6c using a paper handkerchief. Fig. 6a shows the pattern created by the embossing on the front and on the back. FIG. 6b shows the embossing pattern on the front and FIG. 6c the embossing pattern on the back. As said, both combine to form an embossing pattern according to FIG. 6a.

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

The weight per unit area of the individual layers is preferably 12 to 45 g / m ² , it being possible for 2 to 8 layers to be connected to one another. The weight per unit area of the entire cloth is preferably 24 to 150 g / m ² . The thickness of the cloth here is preferably in the range from 0.15 mm to 1.5 mm. The dry strength of a four-ply 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 (8)

1.Product predominantly made of cellulose for the hygiene sector, in particular tissue paper with at least two layers ( 5 , 6 , 7 , 8 ) made of tissue or non-woven or a layer composite thereof and an embossed pattern consisting of a large number of layers individual impressions ( 2 , 3 ) which deform and connect the layers transversely to the layer surface and each emanate from the outer surfaces of the layers and are concavely curved inwards, the layer adhesion being given by the embossing pressure, characterized in that the adjacent impressions ( 2 ; 3 ), which are curved inwards from opposite sides (surfaces) of the product, are arranged offset in relation to one another in the layer direction in such a way that in each case the bottom ( 9 ) of an impression ( 2 ; 3 ) emerges from the outer surface of one side of the cellulose cloth, with the non-embossed wall ( 10 ) of the outer surface of the other Side of the product is connected by embossing (layer adhesion) and vice versa for the neighboring imprint. 2. Product according to claim 1, characterized in that the impressions ( 2 ; 3 ) are embossing points. 3. Product according to claim 1, characterized in that the impressions ( 2 ; 3 ) are embossing lines. 4. Product according to claim 1, characterized in that the impressions are a combination of stamping points and Are embossing lines. 5. Product according to at least one of claims 1 to 4, characterized in that the embossing pattern over an edge area of the cloth is trained. 6. Product according to at least one of claims 1 to 5, characterized in that the opposing surfaces provided and adjacent impressions ( 2 ; 3 ) are at least partially so close together that their adjacent wall sections ( 11 ) connected by embossing (layer adhesion) are. 7. A 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 knobs (N1, N2) of the embossing rollers ( 12 , 13 ) intermesh with one another and the tips of the embossing knobs fit tightly but without contact to the base ( 16 ) made of steel, ceramic or a similar hard material between the embossing knobs (N1, N2) ) of the respective counter roller. 8. The device according to claim 7, characterized in that the embossing rollers ( 12 , 13 ) additional deflection rollers or elastic pressure rollers ( 21 , 22 ) are assigned such that the layers (M1; M2) separately the embossing gap of the embossing rollers ( 12 , 13 ) can be supplied, and that a moistening device ( 19 , 20 ; 25 , 26 ) for moistening the individual layers (M1; M2) is arranged upstream of the embossing gap.