SK11092003A3 - Device for the production of a product made from tissue and/or like material with at least two plies - Google Patents

Abstract

A device is disclosed with the object of providing a device for the production of products made from tissue and/or tissue-like materials with at least two plies, which have adequate adhesion between the individual layers of the two and more ply products. Said device comprises an embossing unit with at least two rollers, one roller being a plain roller (2) and the other an embossing roller (3). Said embossing roller (3) comprises a shaft and at least two segments arranged thereon with embossing elements (5). Said embossing roller is subjected to pressure by means of a bearing unit (7) arranged on the shaft.

Description

The present invention relates to an apparatus for producing at least two-layer products made of tissue and / or tissue-like material by means of a pregeneration unit, as well as to a method for producing such products and also at least two-layer products.

BACKGROUND OF THE INVENTION

Tissue and / or tissue-like material finds versatile use. Such materials include, for example, toilet paper, handkerchiefs, kitchen paper rolls, napkins, paper tablecloths, absorbent and absorbent pads, paper handkerchiefs, dish towels, rags and many other various products.

For the purposes of the present invention, tissue is a product that complies with DIN 6730. Accordingly, tissue is a product which consists wholly or predominantly of pulp fibers, with fine and soft creping and closed formation, produced on a paper machine with a dry matter content of more than 90 %, consisting of one or more layers, which is in particular absorbent, with a specific weight per layer <25 g / cm ² before creping and a creep wet elongation> 5%.

For the purposes of the present invention, a tissue-like material is one which, unlike a tissue material, is produced by changing the drying process. According to the present invention, according to DIN 6730, a tissue-like material is a product made predominantly of pulp fibers with a large and soft crepe and an open formation which is

156 / B by a paper machine dry creped and consisting of one or more layers, the density of the individual layer before creping <25 g / cm ² and the crepe humidity of one layer after crepe> 55%. Cellulose wadding is particularly absorbent.

Various requirements are imposed on products made of tissue and / or tissue-like material. In addition to properties such as strength, volume, stiffness and absorbency, one of the most important properties of multilayer products is, in particular, the adhesion of the layers to one another, in particular preventing the layers from moving relative to one another. In addition, consumers also require good optical properties and, in particular, a decorative appearance from such products.

Various known pregging methods are used in the prior art to achieve sufficient layer shear resistance in multilayer products. With the so-called Stahl- / Gummi-Prägung resp. The Stahl / Paper-Prägung presses one steel roller equipped with pregating points (die or preger roll) against the elastic smooth roller, which is made of rubber or is a steel roller coated with a paper layer. This achieves a surface prime with a small number of prime points (approximately 6 to 20 prime points / cm ² ) or a large number of prime points (approximately 25 to 65 prime points / cm ² ) - called micro-regulation - especially full-area micro-regulation. The die roll is driven, while the elastic counterpart rotates together as a result of their mutual contact. The action of the pregation points on the tissue material results in both elastic and plastic deformation. By plastic deformation, at least two preggy layers of material cross each other, at least in part. In this way, at least two layers of the product to be produced are prevented from moving relative to one another. However, the functional adhesion of the layers is not achieved.

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In order to achieve the desired adhesion of the layers, the above process is additionally followed by a process of additional creasing of the preged tissue layers. In this case, the individually arranged scoring discs, which work against the driven smooth roller, achieve an additional pregeal structure on the pre-pregred tissue material in the form of continuous patterns (e.g. lines or points) in the direction of movement. The scoring roller is rotated by the friction drive. As a result, a pressure of approximately 500 N / mm ² is applied to the pre-treated tissue product. Disadvantageous for the use of additional creasing is that it can only achieve continuous and continuous patterns to pre-pre-cured patterns and, moreover, reduces the softness of the tissue product in the area of the applied creasing structure. A further disadvantage with the use of the creasing machine is that it is possible to realize only uninterrupted pregging grooves in the direction of movement of the tissue web. It is not possible to achieve pregging with a decorative look.

In addition, the problem, especially in the case of toilet paper, is the so-called defective perforation. This is the case, for example, in the case of a roll of multi-layer toilet paper, inadvertently wrapping a separate, not sufficiently cohesive tissue layer with a roll of toilet paper. The perforation lines between two separate sheets of toilet paper do not lie one above the other. This occurs particularly often at the beginning of the roll of toilet paper when the first sheet is torn off and is glued to the underlying layer of toilet paper. This problem of erroneous perforation occurs in all known pregging methods where the cohesiveness of the layers is not achieved.

Another prior art pregging method is the so-called Union-Prägung method. In this Unions-Prägung, the at least two-layer starting material is guided between at least two mutually running rollers, which rollers are provided on their surfaces with radially arranged projections, the cross-section of which is in the form of a blunt pyramid. The protrusions of one cylinder engage in recesses formed by the protrusions of the other cylinder. The starting material passes between the two rollers, and is embossed over the projections of both rollers over the entire surface or on a part of the surface.

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Since the unwanted movement of the two rollers cannot bring into contact the generated prong points and the grooves lying opposite to them, the starting material is pushed against each other in the Union-Prägung. By this punching, at least two of the starting sheets cross each other, but still this does not achieve sufficient layer shifting to prevent erratic perforation. For this reason, the gap between the rollers must be adjusted very precisely for both rollers, otherwise the two opposing rollers could be damaged. In general, tissue products produced by the UnionPrägung process are additionally grooved by means of a scoring process.

Multilayer Tissue products are also produced after the so-called Punkt / Glatt-Pregelling process. In this case, the steel roll provided with pregeling points and the smooth steel roll (the so-called smooth roll) are arranged such that a defined distance is maintained between them. This distance is achieved by an expensive slot adjustment. The starting strips of material are pressed together so strongly that the layers are fixed to one another when passing between the smooth roller and the prong roller. The pressure required for this compression must be applied by the cylindrical structure itself. The required pressures are in the range of about 230 N / m ² . Due to this high pressure, the method is limited to narrow widths of the material web, for example, to the handkerchief webs. In this case, support is required associated with the prime roller / counter-roller system. By this system, pregging patterns can be applied in the form of longitudinal or transverse lines, which are known, for example, in handkerchiefs. The absence of supporting the prong roller against the smooth roller may result in a "puncture" or "uplift" of the prong roller. In the first case, this leads to damage to the prime roller ("flattening prime points") by touching the prime points with the smooth roller. In the latter case, the coherence of the layers is not obtained (insufficient compression of the tissue layers). Compensation between the application of the longitudinal and transverse lines (especially for handkerchiefs) is difficult to achieve with the adjuster between the preg and smooth roller.

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In addition, various methods are known in the art in which, in addition to the pegging, in which differently distributed patterns are applied to the surface, partial or full-surface gluing follows. For this purpose, it is necessary to use an adhesive device in series, which, however, increases production costs. The adhesive device applies the adhesive to the tissue layers via the adhesive rollers. A portion of the adhesive is applied to the tissue layer, and a portion is collected for reuse in the container. However, the adhesive is contaminated by the high dust content of the tissue belt. The adhesive unit therefore has high cleaning costs. Finally, due to the application of the adhesive, although this is applied only partially and not over the entire surface to the tissue webs, the resulting tissue product is "plate-like, i.e. clearly loses softness." A further disadvantage is that the use of the adhesive is limited to a maximum of 3-ply tissue products, since the applied adhesive must penetrate the individual layers for bonding.

The so-called decorative printing, i.e. generating pregings, which can be used to form shape patterns such as flowers and the like. on the tissue product, is achieved, for example, by an additional pegging unit / adhesive unit. For example, some pregular points are formed on the pregger roll in the region of the desired decorative print, in the form of the desired shape pattern. However, such additional pegging does not achieve any additional adhesion of the layers, which is less than that of full-area micro-impregnated products, so that gluing with these drawbacks and / or creasing with a creasing machine is necessary. However, the additional creasing deteriorates the good optical appearance, especially when the creasing takes place through the shape patterns shown.

It is therefore an object of the present invention to provide a device that does not have the drawbacks of devices known in the art.

SUMMARY OF THE INVENTION

According to the invention, this object is achieved by an apparatus for producing at least two-layer products of tissue and / or tissue-like material, which comprises a deregulation unit with at least two rollers, one of which is a roll

156 / B, the smooth roller and the second roller is a prong roller, wherein the prong roller comprises a shaft and at least two segments disposed thereon with pregging elements, the roller being pressurized by at least one shaft-mounted bearing unit. The pressure is transmitted to the bearing unit by a pressure device. By means of the device according to the invention, it is possible to produce multilayer products having excellent layer cohesion. In addition, the cohesiveness of the layers can be achieved at a conventional machine width of, for example, 2800 mm or more.

In the case of the pre-treated tissue, this eliminates the creasing unit or the gluing unit required to ensure the bonding of the layers, and allows the decorative print to be applied. The device according to the invention replaces the creasing unit or the adhesive unit, which are necessary in the above-mentioned methods for producing tissue products. The device according to the present invention enables the strip of the starting material to be coated in whole or in part. Particularly advantageous here is the application of the decorative printing by means of the pregging elements. There is also no need for glue application.

The high pressure required for the pressure action is preferably obtained from at least one pressure device comprising at least one pressure cylinder. In this case, one pressure device can be associated with each segment, but preferably two segments are associated with one pressure device. The pressure cylinders can be activated if necessary. However, it is also possible to activate several pressure cylinders together. The pressure devices are preferably movable independently of one another. For example, at a tissue width of approximately 2800 mm, 27 pressure cylinders and a corresponding number of 28 segments can be arranged on the shaft. The shaft together with the bearing device and the segments form a preg cylinder. By means of the targeted compressive action on the individual segments by means of the bearing units, a mutual deflection of the rollers is achieved, by which the flexible flexible roll is also adapted to the flexible smooth roll. The advantage of this is that there is no mutual damage to the rollers. By applying pressure through segments containing pregging elements, a uniform and defined support is achieved

156 / B of the whole preg cylinder. The pressure cylinder of the pressure device may be adjusted to a pressure in the range of from about 3 to 10 bar, particularly preferably from 4 to 6 bar.

According to a further embodiment of the invention, the pressure device is provided with a stop for adjusting the gap between the rollers. Preferably, this stop is adjustable by means of a wedge. This makes it possible to pre-tension the pregger roll precisely before use by separate pressure devices.

The bearing unit preferably comprises ball bearings. However, it is possible to use a bearing of any other known type. It is important that the bearing is to receive a radial load and also have axial guiding properties. In addition, the bearings can also be equipped with a guide. By acting of the pressure cylinder through the bearing device on the prong cylinder, on the one hand, the slot can be precisely adjusted externally even during machine operation and, on the other hand, any bearing vibrations of the prong cylinder are absorbed by the bearing unit. A further intermediate bearing may be provided between the pressure cylinder and the bearing unit.

The bearing unit is preferably arranged between two segments, and thus the pressure device can act on the bearing unit between the two segments immediately through the extension.

The die roll is preferably provided with a quick release device. This makes it possible in a relatively simple way to create different patterns according to the customer's wishes (especially logos) by a single processing line. Preferably, the prong roller provided with a quick-release device is mounted on a separately mounted pin.

Both the smooth roller and the prong roller of the device according to the invention can have the same diameter. However, this is not necessary, but rollers of different diameters can also be used. Preferably, the smooth roller and the prong roller have the same circulation speed. Further preferably, the smooth roller and the pregger roller can be driven.

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By means of the device according to the invention, in contrast to the creasing methods, decorative prints can be applied not only continuously and continuously, but also separately and sorted.

The present invention further relates to a method for producing at least two-layer products of tissue and / or tissue-like material on an apparatus, wherein in a first step at least two material strips are fed into a gap between the smooth roller and the spinning roller;

in a second step, the material strips are joined together by segments that are provided with pregging elements; and in a third step, the obtained product is removed from the apparatus.

The process according to the invention advantageously produces products which have excellent layer adhesion properties. It is also possible to produce products with very nice decorative prints. According to a preferred embodiment of the method according to the invention, the bonding of the individual material strips is carried out with a pressure of at least 700 N / mm ² . Preferably pressures of at least 900 N / mm ² , and even more preferably at least 1100 N / mm ^{2, are used} . Such pressures on the material strips can only be achieved in such a way that the prong roller is adapted to pressurize by means of bearings on the individual segments.

Finally, the present invention relates to at least a bilayered product of tissue and / or tissue-like material produced by the apparatus of the invention. Advantageously, such at least two-layered article provided with a decorative print externally does not contain any further pregging, in particular microregulation. It is further preferred that it is not knurled and / or glued. The at least two-layer material according to the invention therefore has excellent optical and contact properties, and moreover the two layers are very cohesive to each other.

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BRIEF DESCRIPTION OF THE DRAWINGS

These and other advantages of the present invention will be elucidated in the following on the basis of exemplary embodiments and the accompanying drawings. In the drawings:

1 is a cross-sectional view of a pregeneration unit of the apparatus of the invention;

Fig. 2 is a side view of a pregger according to the invention;

3 shows a top view of a segment of a segment with a pregger element.

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 shows the denoting unit of the apparatus for producing at least two-layer tissue and / or tissue-like material according to the invention with reference numeral 1. The blending unit 1 comprises a smooth roller 2 as well as a prong roller 3. The smooth roller 2 and the prong roller 3 rotate with respect to each other and are driven in the direction of the arrow 17 and 18. The smooth roller 2 has a slightly larger diameter than the prong roller 3.

The die roll 3 comprises a shaft 4, and is mounted on its bearing unit 7. Further, the die roll 3 comprises the die elements 5. An extension 22 of the pressure device 8 extends into the die roll 3. This extension 22 is arranged on a rocker 21 side stop 10 and pressure cylinder 9.

In this case, the pressure roller 9 exerts pressure in the direction of the arrow 30 via the rocker lever 21 and the extension 22 on the pressure roller 3. In this case, the pressure roller 8 is biased against the smooth roller 2 by means of the stop 10. a defined slot 11 is provided. The stop 10 can be realized, for example, by a wedge stop not shown here, the wedge being movable by means of a slotted nut and acting on the stop 10 assigned to the end of the rocker 21. However, the stop 10 can also

156 / B directly to the pressure device 8 by means of a screw without the aid of a wedge at the end of the rocker lever 21. The pressure cylinder 9 is filled through a pressure supply (not shown) to a pressure of approximately 5 bar.

For the production of, for example, a two-layer tissue product, the material strips 14 and 15 of unregulated, single-layer material in the direction of the arrows 19 and 20 are fed together to the pregeneration unit 7. They are guided through a slot 11 between the smooth roller 2 and the spinning roller 3, whereby the two material strips 14 and 15 are provided with a decorative print on the spinning roller 3 and are thereby joined together. The thus bonded two-layer product 16 is further discharged and removed from the pregeneration unit 1.

The smooth roller 2 and the prong roller 3 are driven by a fixed gear drive, which may be a pair of rapporträder. This achieves that the smooth roller 2 and the prong roller 3 have the same orbital speed.

In FIG. 2 shows the arrangement of the prong roller 3. The prong roller 3 here comprises a plurality of segments 6 which are arranged on the shaft 4 of the pregeneration unit with the overall width of the material web. Thus, for example, for one width of the 2800 mm web, 28 segments 6 are arranged together. These segments 6 carry the pregeneration elements 5 which are arranged side by side and mounted on the segments 6. The pregeneration elements 5 on the segments 6 are arranged, for example The paper has 5 elements with decorative print. This is sufficient to permanently bond the layers. However, a plurality of decorative priming elements may be provided per sheet.

Bearing units 7 are arranged between the individual segments 6, in which the extension 22 of the pressure device 8 fits. The bearing unit 7 here comprises a bushing 24 which is fixedly connected to the shaft 4. A bushing 25, which comprises a ball bearing 12, is mounted. The bearing 25 is guided to guide the bearing 12. Further, the bearing 12 is arranged with respect to the longitudinal axis of the shaft 4 so that it can accept axial forces exerted on the bearing 12 by the pressure device 8.

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The individual segments 6 of the spinning cylinder 3 are interconnected by means of pins 23. These are mounted in mutually coaxial recesses of pairs of adjacent segments 6. The segments 6 and the housing / cover units 24, 25 are guided radially on the shaft 4. Axial fixation of the segments 6 is achieved by externally mounted pins 23 on the housing 24 by clamping all the segments 6 with the housing / cover unit 24, 25 by means of at least one nut 31, arranged externally and laterally on the shaft. The nut 31 acts on the corresponding segments 6 via the connecting element 32, which on at least one side in the recess for receiving the pin 23, coaxially arranged to receive the first segment 6.1, acts on the corresponding segments 6. Radial fixing of the segments 6 is effected In this way, the segments 6 can be rotated relative to adjacent segments, thereby achieving a uniform load distribution during operation. In addition, it will be preferable to only need one type of segments per cylinder.

The die roll 3 is equipped with a quick-release device 13. This consists of a dome element 26 which is fastened to the bolts of the device according to the invention by means of hexagonal screws 28 and 29. The drive of the prime roller 3 is made possible by a tight tongue (not shown) fixed on the shaft 4, which is contained in the dome member 26, and allows easy fixing by a screw 27. quickly remove from the machine tool and replace it with another cylinder which is provided with pregging elements 5 with different patterns. Thus it is possible to apply different ornamental prints with one machine.

The individual pregener elements 5 are mounted on the segments 6 of the preg cylinder 3 and have a circular construction. However, any other form may also be used, for example the pregeling elements 5 may have a square or rectangular shape or a pyramid shape. By placing the pregener elements 5 side by side on the segments 6, a uniform load distribution is preferably achieved over the entire width of the pregger roll 3.

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Fig. 3 shows the prime element 5 itself, which is arranged on the segment 6 of the prime cylinder 3. The prime element 5 is circular in shape and comprises a base 31 on which the prime points 32 are arranged such that they form a letter &quot; M. Of course, other letters, characters, or pictorial representations such as flowers or the like are also possible. The depth distance of the pregeling points 32 from the base 31 is adjusted according to the shaped elements 33 and the preged material. The depth spacing of the base 31 from the segmented base 34 is selected so as to prevent crushing of the tissue web.

The brewing unit 1 produces a two-layer tissue product. Unregulated tissue material having a grammage in the range of about 18.5 to 22 g / cm ² and a thickness of about 150 µm can be used as the starting material. For this, an ornamental print is applied by means of a pegging in the shape of FIG. 3 of the letter "M". A pressure of 5 bar is applied to the pressure cylinder. The width of the material strips is approximately 2800 mm. The pressing pressure is approximately 1150 N / mm ² , the linear pressure is approximately 85 N / mm. The linear pressure is generally at least 45 N / mm and preferably ranges from 60 N / mm to 110 N / mm, even more preferably from 80 N / mm to 100 N / mm. A two-layer tissue product is obtained which, without further creasing or gluing, has well-connected layers to one another. In the area of ornamental printing, no concavities were observed, which occur particularly during creasing, and no densification of the product was observed. If the tissue product produced in this way is held against the light source, it can be clearly observed that in the area of the ornamental printing the product is clearly more translucent than in the unregulated area. In addition, the aforementioned flat-preged tissue product (microregulation) was obtained by the pregeneration unit 1. The individual layers (in this case four) are fixed to each other by means of a series of decorative pegs. The appearance of decorative pregging is equal to the above.

In particular, the device according to the invention makes it possible to achieve sufficient and high layer cohesion between the layers of a multilayer tissue product. In addition, this cohesiveness of the layers is realized exclusively by decorative pregging. In particular, it is not necessary to use the device according to the invention

156 / B use of either creasing or gluing of the product to achieve the cohesiveness of the layers. The device according to the invention makes it possible for the first time to decorate a strip of material with a width of 2800 mm or more. The pressure device used in the device according to the invention makes it possible to ensure continuous and constant support of the segments. The pre-roll is easily and quickly replaceable so that various decorative designs can be realized according to customer requirements without great assembly costs by simply replacing the pre-roll.

Claims (13)

Apparatus for producing at least two-layer products of tissue and / or tissue-like material, comprising a pregeneration unit (1) with at least two rollers (2,3), one of which is a smooth roller (2) and the other roller is a preger roller (3), characterized in that the roller (3) comprises a shaft (4) and at least two segments (6) disposed thereon, provided with the roller elements (5), and that the roller (3) is subjected to pressure by at least one of a shaft unit (4) of an arranged bearing unit (7), the bearing unit (7) being arranged between two segments (6). Device according to claim 1, characterized in that decorative pregging is applied by means of the pregging elements (5). Device according to claim 1 or 2, characterized in that the pressure action is carried out by means of at least one pressure device (8) comprising at least one pressure cylinder (9). Device according to one of the preceding claims, characterized in that the pressure device (8) is provided with a stop (10) for adjusting the gap (11) between the rollers (2,3). Device according to one of the preceding claims, characterized in that the bearing unit (7) comprises a ball bearing (12). Device according to one of the preceding claims, characterized in that the pregger roll (3) is provided with a quick-release device (13). 31,156 / B Device according to one of the preceding claims, characterized in that the smooth roller (2) and the pregger roller (3) have the same circulation speed. Device according to one of the preceding claims, characterized in that the smooth roller (2) and the pregger roller (3) are driven. Pre-roll according to one of claims 1 to 8. Method for producing at least two-layer products of tissue and / or tissue-like material, in particular by the apparatus according to claims 1 to 9, wherein in the first step at least two material strips (14, 15) are fed into the slot (11) between the smooth roller (2) and a quench roller (3), wherein the quench roller (3) is subjected to pressure; in a second step the material strips (14, 15) are connected to each other by means of segments (6) arranged on the roller (3), which are provided with the roller elements (5); and in a third step, the article (16) is removed from the device. Method according to claim 10, characterized in that the joining of the individual material strips (14, 15) is carried out by a pressure of at least 700 N / mm ² . At least a bilayered article of tissue and / or tissue-like material produced by the apparatus of any one of claims 1 to 8. At least two-layer product according to claim 12, characterized in that it is not micro-regulated.