EP1039027A1 - Multilayer tissue paper web, tissue paper product as well as their production - Google Patents

Abstract

The present invention relates to a tissue web containing at least 2 layers, of which at least one backing layer and at least one absorbent layer have different fiber compositions, the backing layer (s) containing a wet strength agent, the main part of the absorbent layer (s) being made of a special fiber material exists, wherein the absorbency of the absorbent layer is substantially unaffected by the presence of the wet strength agent and / or the wet strength agent used in the backing layer.

Description

The present invention relates to a multi-layer, multi-layer tissue web, which have both high absorbency and good wet strength having.

Under multi-layer tissue product with several tissue webs in the sense of the present invention is preferably understood to be kitchen towels, hand towels, Tollette paper, but in particular a corresponding, at least 2-ply Kitchen towel with the layer sequence according to the invention also Facial tissues, facial tissues, napkins and, if necessary, handkerchiefs.

From the weekly paper for paper manufacture 11/12 (1986), page 453 it is known that leaves of CTMP according to Table 5 have a high water absorption of 10 to Have 12 g water per g fiber, in contrast to salt from leaves bleached sulfate pulp with only 5 to 10 g water per g fiber. Further there is stated that an addition of CTMP to the pulp in the manufacture to tissue products an increase in water absorption results, as it turns out Table 4 shows. The cause of this behavior is that some CTMP varieties have their own high specific volumes.

At the same time, however, adding CTMP causes a reduction mechanical properties, such as the breaking resistance, such as from Table 3 can be seen. Whiteness is also increased by adding CTMP diminished, as can be seen from this publication on page 456, in the right column above, results. To avoid this negative caused by CTMP Properties in the finished tissue product are described in the publication Appita, volume 41, Number 1, page 58-60, a two-lane (two-layer) product is used, whereby each of the two layers consists of a two-layer composite sheet, the outside consists of cellulose and inside of CTMP, as can be seen, for example, from FIG. 8 results.

A similar product is also in the publication Pulp and Paper, Canada, volume 89, Issue 11 (1988), pages 381-383.

The publication in Tappi Journal, April 1988, page 141, which combined Effect of fine fibers and dissolved organic substances Tissue properties describes, generally shows that the quality of the tissue Contamination can be affected in white water or circulating water available. In particular, in the paragraph on absorption rate, i.e. H. the Speed of water absorption, carried out that dissolved organic matter for impurities more important than CTMP fine fibers for the determination of Absorption rate are. In this context it was found that during the manufacture of a paper towel the addition of resin acid and lignin Reduce the absorption rate. By adding resin glue (Epichlorohydrin resins, melamine and urea-formaldehyde resins, cationic Polyacrylamide), which serves as a sizing agent, becomes a permanent wet strength Tissue product received, the further addition of lignin the normal Absorbance reduced to 15%. The addition of xylan increases this Absorbance by 15%, although a mixture of organic substances, which contains up to 70% of this component, the effect of resinic acid and lignin not covered.

WO 95/00706 relates to a soft tissue product containing at least one tissue layer with a specific volume of 5 cm ³ / g or more and a maximum deviation of 10% or less depending on machine running. According to a preferred embodiment, such paper contains CTMP in at least one of its layers. However, this prior art neither describes nor suggests the subject matter as claimed below.

WO 97/11227 also relates to a multi-layer web-shaped tissue product at least three layers at least partially connected with two optionally embossed outer layers predominantly containing cellulose and at least one, optionally embossed, predominantly natural fibers and / or Pulp fibers that are stiffened in the way or within the chemical Fiber wall have been cross-linked to the ability of these fibers to form of hydrogen bonds in the wet state is significantly reduced, containing inner layers, only the outer layer up to 8 wt .-% of one Contains wet strength agent, based on the raw tissue. Even after this However, technology does not become the object as claimed below prescribe still suggested.

A high water absorption is known, u. a. with kitchen towels important quality criterion, such as the result of an article in Wochenblatt für Papierfabrikation, issue 11/12, 1988, pages 432-434.

A sufficiently high wet strength is also an essential requirement for the intended use of kitchen and Towels, but also napkins and handkerchiefs. For example it is undesirable that parts of the cloth (product) outer surfaces, such as not sufficiently bound fibers, especially those on the surface of the cloth in the Contact with food or the skin of the hands, for example peel off and be transferred to the food or hands and there cling to. To date, this has not been adequately solved by the prior art

Furthermore, sufficient tensile strength, especially wet tensile strength, be ensured, for example, when transporting moist food, of freshly washed fruit, in a kitchen towel.

The present invention has for its object a tissue web to provide, which have both a high absorbency and a good Has wet strength. This object is solved by claim 1.

The present invention thus relates to a tissue web containing at least 2 Layers, of which at least one carrier layer (first layer) and at least a suction layer (another layer) of different fiber compositions the carrier layer (s) containing a wet strength agent, characterized in that the main part of the absorbent layer (s) consists of a special fibrous material exists, the absorbency of Absorbent layer affected by the wet strength agent used in the backing layer becomes.

Multi-layer tissue web

A layering or layers within the meaning of the present invention is spoken when multiple layers through hydrogen bonds, are connected to one another over the entire surface or almost over the entire surface, i.e. the Layer (s) cannot be separated. The invention Bahn must have at least two layers and at least one of them must have the fibrous formulation according to the invention. and another must than Carrier layer can work. Tissue webs not according to the invention can have the same fiber formulations for different layers and also to be single-layered.

A layer in the sense of the present invention is the same as one Tissue web. A tissue product can consist of several layers, but also of only one of a situation. The layers in a multi-layer product can pass through Be glued or embossed.

The above absorbent layer functions as an absorbent layer. This Layer has good absorption properties. The above carrier layer is a layer with good wet strength properties. The carrier layer can also absorb, but not as well as the absorbent layer.

If weight% (% by weight) is referred to in the following,% Dry matter based on total dry fiber, if not different Are defined.

According to a preferred embodiment of the present invention, the Absorbent layer at least 75% by weight, preferably at least 80% by weight, but in particular at least 90 wt .-%, based on the dry weight of the Absorbent layer of special fiber.

According to a further preferred embodiment of the tissue web according to the invention, the carrier layer (s) consisting predominantly of cellulose can have a basis weight in the range from 5 to 40 g / m ² , preferably 5 to 20 g / m ² , in particular 5 to 18 g / m ² and the Absorbent layer (s) have a basis weight in the range of 5 to 40 g / m ² , preferably 5 to 30 g / m ² , in particular 5 to 20 g / m ² . The basis weight of a web can therefore be 10 to 80 g / m ² , preferably 10 to 50 g / m ² , in particular 10 to 38 g / m ² .

According to a further preferred embodiment, the invention contains Tissue web blows wet as well as dry strength agents, which are preferably in Amounts from 0.001 to 5 wt .-%, preferably 0.1 to 2.5 wt .-% and in particular 0.2 to 2% by weight, based on the weight of the raw tissue, be used.

Another object of the present invention is a multilayer Tissue product which is at least one of the aforementioned tissue web (s) Contains individual layers.

Absorbent layer

The aforementioned further layer (absorbent layer) is a for normally cationic wet strength agents, non-attachable fiber material. This is done, for example, by a partial or complete removal of the Hemicelluloses possible, for example, through mercerization. By extensive Removal of these hemicelluloses will increase the swellability of fibrous materials Water is reduced or eliminated and is therefore accessible to the functional groups, for example carboxyl groups when used later this pulp is not given on non-woven or paper-producing plants. This functional groups represent important reaction sites for cationic ones Process chemicals such as epichlorohydrin resins, cationic starch, and other cationic cellulose derivatives. The more or less existing Inaccessibility of the carboxyl groups leads to the lack of fixation of the Process chemicals on the fiber. The invention, in the absorbent layer contained α-cellulose content is an indirect measure of the low content of Hemicelluloses. Hemicelluloses represent an important source of the number present carboxyl groups. These in turn are classified according to different Investigations as recipients of cationic wet strength agents (for example Epichlorohydrin resins) (see e.g. ISOGAL et al., Journal of Pulp and Paper Science, May 1997, page 215 ff and Tappi Tissue Runnability Seminar 1991, pages 39-47, Tappi Press Atlanta).

Another option is to add cationic groups the fibers to achieve a positive overall charge of the same. A Fixation of a cationic chemical to the fiber is then also avoided.

According to a further preferred embodiment, the invention is Tissue web characterized in that this preferably a fibrous material without functional groups, but preferably with very little carboxyl groups contains.

According to PHILLIP, RHEDER, LANG (Das Paper 1/1965, pp. 1 - 8) as methylene blue detection of the carboxyl groups be determined. Preferred values of the content of the carboxyl groups are less than 50 mmol / kg pulp, preferably less than 30 mmol / kg pulp, in particular less than 20 mmol / kg pulp.

According to a further preferred embodiment, the invention Tissue web in the absorbent layer less than 20 wt .-%, preferably less than 15% by weight hemicellulose, less than 1% by weight, preferably less than 0.5 % Lignin by weight and less than 0.8% by weight, preferably less than 0.4% by weight Extract substances.

The absorbent layer (s) can consist of 0 to 100% by weight, preferably 40 to 90% by weight Alpha cellulose, modified cellulose or wood pulp, and 0 to 60% by weight, preferably 10-20% by weight of cellulose and conventional auxiliaries and additives as Rest exist.

The aforementioned hemicellulose content is usually according to DIN 54356 determined, the content of lignin is usually determined according to DIN 54357 and the content of extract substances is usually determined according to DIN 54354. The The aforementioned α-cellulose content is usually determined in accordance with DIN 54356.

According to a further preferred embodiment, the fiber used around chemical fiber pulp from hardwood or softwood, modified HTCTMP fibers and / or CTMP fibers, synthetic fibers, but especially about chemical fiber pulp.

Other cellulose qualities to be used as absorbent layers are rayon fibers, Viscose fibers, especially modal fibers or synthetic fibers.

A special is preferred in the context of the further or absorbent layer modified cellulose or wood pulp used, as for example from the Buckeye company as pulp quality Buckeye HPZ III and from Lenzing AG, Austria as viscose fiber, for example under the trade name Lenzing Viscose for cotton wool, Lenzing Viscose crimped for nonwovens, Lenzing Super crimped viscose for nonwovens, Lenzing Viscose FR for nonwovens and Lenzing Modal is offered for nonwovens.

According to another very preferred embodiment of the present Invention has the absorbent layer treated with wet strength agent, at least 50%, preferably at least 55%, but in particular 60% of the absolute Absorption of an untreated layer. Are there the air-dried fibers of the absorbent layer with 0.01 to 5 wt .-%, preferably 0.1 to 2.5 wt .-% and in particular 0.2 to 2 wt .-%, each based on the Weight of this absorbent layer, with the component according to the invention used wet strength agents, for example LURESIN KNU, BASF AG, treated. The absolute absorption is determined according to DIN 54540.

According to a further special embodiment of the present invention contains the absorbent layer in the tissue web according to the invention non-ionic, biionic or cationic fibers.

According to a further preferred embodiment, the absorbent layer in the tissue web according to the invention has a specific volume of 1.8 cm ³ / g to 4.5 cm ³ / g, preferably 2.0 cm ³ / g to 3.5 cm ³ / g.

Carrier layer

The backing layer can be made from a conventional tissue formulation for tissue paper be made. According to the invention, it is the function of the carrier layer that Paper has good mechanical properties, especially wet strength and To impart wet tensile strength. The carrier layer naturally also contributes to that Total absorption of the tissue web according to the invention and of the tissue product at.

According to a further preferred embodiment of the aforementioned invention contain the carrier layers 20 to 100 wt .-%, preferably 70 to 100 wt .-% Pulp and 0 to 80 wt .-%, preferably 0 to 30 wt .-% synthetic fibers or chemically modified natural fibers or special wood pulp fibers.

One is preferably used for the above-mentioned carrier layers Raw tissue quality, consisting of those obtained using the sulfite process Softwood pulp qualities, for example spruce, fir and larch wood or hardwood pulp qualities such as beech sulfite, birch or Poplar Sulfite, a. Alternatively, you can also get a raw tissue quality from the the softwood and / or hardwood pulp qualities obtained by the sulfate process, deploy.

Finally, synthetic fibers such as polypropylene fibers can also be used (e.g. Chisso-Polypro, sold by Chissofibre S.A., Belgium), HD polyethylene fibers, Polyester fibers, especially those based on aromatic Polyesters or polyethylene terephthalate (Dacron® from Dupont) as well Polyvinyl alcohol, the above-mentioned polypropylene fibers and polyethylene terephthalate, Polyester fibers are preferably used.

Mixtures of the aforementioned tissue qualities can also be used.

Wet strength agent

According to a further preferred embodiment, the im Frame of the wet web used according to the invention to a cationic and / or an amphoteric wet strength agent, which polyamide epichlorohydrin resins, Polyamidaminepichlorohydrin resins, such as under the trade name Luresin KNU from BASF AG, Ludwigshafen, cationic polyvinylamines, melamine-formaldehyde or urea-formaldehyde, Contains condensation products or Polyalculenpolyamine.

Wet strength agents of this type are used in tissue production in the neutral pH range used. Depending on the choice of chemical aids, however, there is an increase or lower the pH value. Other wet strength agents are for one Production under acidic conditions melamine / formaldehyde or Urea / formaldehyde condensation products. Products with coupled wet and dry strengthening effect are used, for example a cationic polyacrylamide such as Parez® 631 NC from Cytec Industries.

Finally, polyalkylene polyamines, for example, are also used as wet strength agents Polyethyleneimine, to name the noticeable wet effects in the neutral range show without being chemically reactive.

Wet strength agents are used in amounts of 0.001 to 5% by weight, preferably 0.1 to 2.5 % By weight and in particular 0.2 to 2% by weight, based on the raw tissue used.

Such wet strength agents are water-insoluble resins. You protect those at the Crossing points of the paper fibers formed hydrogen bonds at least partially before the strength-destroying access of Water.

Multi-layer product

Another object of the present invention is a multi-layer tissue product, which one or more of the aforementioned according to the invention contains multilayer tissue web. The tissue product can also use other tissue layers from conventional tissue included.

It is preferred for multi-layer tissue products that the absorbent layers after directed or should be present in one or more inner layers. So there are the absorbent layers, which have a good absorption capacity but bad ones Have wet strength, protected from mechanical wear.

A two-ply tissue product can consist of one or two according to the invention Tissue webs are made with the absorbent layer (s) facing inwards should). If the product contains only one web according to the invention, the other webs are made of conventional tissue.

A three- or multi-layer product can consist of one or more tissue webs consist. For example, a tissue web that has two absorbent layers on the outside, be arranged between two layers of conventional tissue pulp.

According to a further preferred embodiment of the invention multi-layer, web-shaped tissue product, the individual layers may differ different basis weight from usually the same basis weight exhibit.

According to a further preferred embodiment of the aforementioned invention The web-like tissue product is made up of 25 layers % By weight to 85% by weight, preferably 30% by weight to 50% by weight from the Backing layer and 15% to 75% by weight, preferably 50% to 70% by weight % By weight from the absorbent layer.

mehrschichtige" Tissueeinzelbahn wird durch Verarbeitungsverfahren wie Doublierung, Prägung und Verleimung zu einem mehrlagigen Tissueprodukt, z.B. 3 lagigem Küchentuch, verarbeitet.This so generated

multi-layer "single tissue web is processed by processing methods such as doubling, embossing and gluing to a multi-layer tissue product, eg 3-ply kitchen towel.

According to a preferred embodiment, the invention Multi-day tissue product made up of at least part of the individual layers same or a different stamp from layer to layer.

According to a further preferred embodiment of the present invention the multilayer tissue product according to the invention has a binding of individual layers, which is preferably mechanical or an adhesive.

method

According to a further preferred embodiment, the present relates Invention a method for producing a multilayer tissue web, wherein at least one carrier layer made of a first fibrous preparation at least one wet strength agent and conventional fibrous materials and at least a suction layer from another fibrous preparation of another Fibrous is produced. The layers become a multilayered web bonded while the layers are still wet, followed by drying the Tissue web. The main part of the absorbent layer (s) consists of a special one Fibrous material, the absorption capacity of the absorbent layer (s) not being affected by the Wet strength agent used in the first layer is affected.

The production of the carrier and absorbent layer for the inventive multilayer, web-shaped tissue product can be used on a paper machine Tissue papers happen. This is done by a single or multilayer headbox, preferably multilayer headbox, or Special forms of the same like suction breast formers in Fourdrinier machines, one out at least one screen existing drainage section (for example one Fourdrinier sieve, a fourdrinier former, a crescent former), possibly one Felt section or another for transporting a partially drained fleece suitable sheet-like construction, for example a circumferential one Plastic or composite tape and a Yankee cylinder for drying the train with creping equipment. The drying section (Yankee cylinder) can a device for through-flow drying may be upstream or at Use TAD drying on a Yankee cylinder and / or crepe can be dispensed with. A smoothing, if necessary a doubling with integrated smoothing can follow.

For the production of the wet-strength first layer, the necessary Chemicals, such as wet strength agents, dyes, dry strength agents, Polyphosphates or defoamers in the speed mixer or in laid paper or on other places usually in the thick part of the constant part of the Tissue machine added. Preferred location for adding chemicals for The machine chest is wet-strength equipment. Other locations like Level box and in front of a fabric pump are also possible. You can also Use in-line mixers.

To manufacture the additional layer from special pulp (e.g. chemical (fiber) pulp) for the multilayer, web-shaped tissue product according to the invention According to the invention, the layer in question is analogous to a wet-strength first layer manufactured, but at least dispensed with the addition of other wet strength agents

The present invention is explained in more detail below by means of exemplary embodiments explained.

Here, the absorption (relative water absorption capacity) is always understood in g of water per g of dry fiber. The absolute absorption is always understood in ml of liquid (water) per m ^{2 of} cellulose and determined according to DIN 54540. The tear length, dry (in m), is determined according to DIN 54540 part 7, the tear length, wet (in m) according to DIN 54540, part 8. In the following examples and comparative examples, the laboratory sheets are always produced according to DIN 54358 (Rapid Höthen).

Example 1 :

A laboratory sheet made of 100% spruce sulfite, to which a wet strength agent based on a PAE resin has been added in an amount of 0.5%, shows an absoulte water absorption capacity (absolute water absorption) of 140 g water per m ^{2 of} fiber and a relative water absorption capacity of 1.9 g per g. The corresponding tear length, dry, is 3,730 m and the corresponding tear length, wet, is 500 m.

Example 2 :

A laboratory sheet also made from 100% spruce sulfite, but without the addition of a wet strength agent, shows an absolute water absorption capacity of 190 g water per m ^{2 of} fiber and a relative water absorption capacity of 2.5 g of water per g of fiber. The corresponding tear length, dry, is 3,800 m and the tear length, wet, 40 m.

Example 3 :

A laboratory sheet made of the chemical fiber pulp Buckeye HTZ3 (available from Buckeye Celluloses in Memphis, Tennessee, USA), to which a wet strength agent based on a PAE resin has been added in an amount of 0.375%, shows an absolute water absorption capacity ( absolute water absorption) of 524 g of water per m ^{2 of} fiber and a relative water absorption capacity of 6.8 g of water per g of fiber. The corresponding tear length, dry, is 170 m and the tear length, wet, 11.5 m.

Example 4 :

A corresponding laboratory sheet for a suction layer, but without the addition of a wet strength agent, on the other hand shows an absolute water absorption capacity (absolute water absorption) of 1,030 g of water per m ^{2 of} fiber and a relative water absorption capacity of 10.5 g of water per g of fiber. The corresponding tear length, dry, is 165 m here and the tear length, wet, 1.1 m.

When comparing the relative or absolute absorption of the wet strength agents containing absorbent layer of Example 3 with the non-wet strength agent Layer of Example 4, there is one in the absolute absorption Reduction to 52% and with relative absorption only to a reduction of 65% of the original value.

Comparative Example 1 :

A common laboratory sheet made of HTCTMP, sold by SCA Östrand AB, Sweden, to which a wet strength agent based on an epichlorohydrin resin has been added in an amount of 0.5%, shows an absolute water absorption capacity (absolute water absorption) of 190 g of water per m ² pulp and a relative water absorption capacity of 2.4 g water per g pulp. The corresponding tear length, dry, is 2,700 m and the corresponding tear length, wet, 380 m.

Comparative Example 2 :

A corresponding laboratory sheet according to the prior art, but without the addition of a wet strength agent, on the other hand shows an absolute water absorption capacity of 646 g of water per m ^{2 of} fiber and a relative water absorption capacity of 8.6 g of water per g of fiber. The corresponding tear length, dry, is 1,800 m and the corresponding tear length, wet, 10 m.

A comparison of comparative example 1 with comparative example 2 clearly shows that a predominantly cellulose-containing layer with a Wet strength agent comes into contact only about 30% of the absolute absorption and only 28% of the relative absorption has what it is for use in special absorbent tissue papers largely unusable.

Comparing the quotient of Comparative Examples 1 and 2 with the quotient of Examples 3 and 4, it can be found that the absolute absorption in Presence of a wet strength agent is more than twice the loss has absolute absorption.

In another experiment, the effect of this further special layer was examined in a multi-layer product.

Comparative Example 3 :

This was made in two layers from two laboratory sheets with a 50% too 50% per layer blend of spruce sulfite pulp made in layers. The Wet strength agent is added to the second layer (corresponding to 50% of the Total fiber), added as 0.375%, calculated on the total been. The laboratory sheets were then placed one on top of the other in the wet state and printed together.

Example 5 :

This was made in the same way, but with the difference that the Recipe contains 50% HTZ and 50% spruce sulfite pulp. 0.375% wet strength agent were only in the spruce sulfite pulp component of layer 2 dosed.

The table below shows the typical results of Comparative Example 3 and Example 5 on a two-layer web in the form of a laboratory sheet. Comparative Example 3 Example 5 Recipe (layer 1) 50% spruce sulfite 50% HTZ (Layer 2) 50% spruce sulfite and 0.375% wet strength agent 50% spruce sulfite and 0.375% wet strength agent execution layered layered Amount of wet strength agent 0.375% on total fabric 0.375% on total fabric Tear length dry 4,100 m 2,070 m Tear length wet 285 m 230 m Absolute water absorption 170 g / m ² 300 g / m ² Relative water absorption 2.3 g / g 9.0 g / g

The aforementioned data, which according to the invention is only intended for laboratory sheets have, as is readily apparent to those skilled in the art, also multi-layer products that cover the special additional layer within the Tissue product included, transferred, this product as such has a significantly higher absolute water absorption capacity.

Claims (24)

Tissue web containing at least 2 layers, of which at least one backing layer and at least one absorbent layer have different fiber compositions, the backing layer (s) containing a wet strength agent, characterized in that the main part of the absorbent layer (s) consists of a special fiber material ( exist), wherein the absorbency of the absorbent layer is little affected by the wet strength agent used in the carrier layer. Tissue web according to claim 1, characterized in that the absorbent layer contains at least 75% by weight, preferably at least 80% by weight, but in particular at least 90% by weight, based on the dry weight of the absorbent layer of the special fibrous material. Tissue web according to claims 1 or 2, characterized in that the absorption capacity of the special fiber materials treated with wet strength agents has at least 50%, preferably at least 55%, and in particular 60% of the original absorption capacity of the untreated layer. Tissue web according to the preceding claims, characterized in that the absorbent layer contains biionic or cationic fibers. Tissue web according to the preceding claims, characterized in that this tissue web contains a fibrous material without functional groups, preferably with very little carboxyl groups. Tissue web according to the preceding claims, characterized in that the absorbent layer contains less than 20% by weight, preferably less than 15% by weight of hemicellulose, less than 1% by weight, preferably less than 0.5% by weight of lignin and less than 0.8% by weight, preferably less than 0.4% by weight of extracts. Tissue web according to the preceding claims, characterized in that the absorbent layer has a specific volume of 1.8 cm ³ / g to 4.5 cm ³ / g, preferably 2.0 cm ³ / g to 3.5 cm ³ / g. Tissue web according to the preceding claims, characterized in that the fiber used in the absorbent layer is chemical fiber pulp made from hardwood or softwood, modified HTCTMP fibers and / or CTMP fibers, synthetic fibers, but in particular chemical fiber pulp. Tissue web according to the preceding claims, characterized in that the wet strength agent is a cationic and / or amphoteric wet strength agent. Tissue web according to the preceding claims, characterized in that it contains polyamide epichlorohydrin resins, polyvinyl amines, polyamide amine epichlorohydrin resins, melamine-formaldehyde or urea-formaldehyde condensation products or polyalkylene polyamines as the cationic wet strength agent. Tissue web according to the preceding claims, characterized in that it contains both wet and dry strength agents, which are preferably present in amounts of 0.001 to 5% by weight, preferably 0.1 to 2.5% by weight and in particular 0.2 to 2% by weight .-% based on the weight of the raw tissue. Tissue web according to the preceding claims, characterized in that it consists of up to 100% by weight, preferably 40 to 90% by weight of alpha cellulose, modified cellulose or wood pulp and 0 to 60% by weight, preferably 10 to 20% by weight. % Pulp as well as usual hooves and additives as the rest. A process for producing a multilayer tissue web, in particular according to claims 1 to 12, wherein at least one backing layer is produced from a first fibrous preparation with at least one wet strength agent and conventional fibrous materials and at least one absorbent layer from a further fibrous preparation of another fibrous material, combine the layers into a multilayered web , while the layers are still wet, followed by drying of the tissue web, characterized in that the main part of the absorbent layer (s) consists of a special fibrous material, the absorbency of the absorbent layer (s) not being affected by the wet strength agent used in the carrier layer , is impaired. A method according to claim 13, characterized in that the headbox is multi-layered. Process according to claims 13 or 14, characterized in that the chemicals, wet strength agents as well as other additives are added to the web. Process according to claims 13 to 15, characterized in that no further wet strength agent is (are) applied to the absorbent layer (s). Process according to claims 13 or 16, characterized in that the tissue is dried conventionally or by means of the TAD process, by means of a Yankee cylinder. Process according to claims 13 to 17, characterized in that the tissue is dried and creped on a Yankee cylinder. Multi-layer tissue product containing at least one tissue web Claims 1 to 12. Multi-layer tissue product according to claim 19, characterized in that at least some of the individual layers have the same or different embossing from layer to layer. Multi-layer tissue product according to claims 19 or 20, characterized in that the individual layers have a bond, which is preferably mechanical or an adhesive. Multi-layer tissue product according to claims 19 to 21, characterized in that at least one layer (s) containing absorbent layer is / are arranged as the inner layer (s). Multi-layer tissue product according to claims 19 to 22, characterized in that it has two two-layer layers, each layer having at least one carrier layer and at least one absorbent layer and wherein the two absorbent layers of the two layers are arranged in relation to one another and the two carrier layers of the two layers are arranged facing outside. Multi-layer tissue product according to claims 19 to 23, characterized in that a layer with two outer surfaces of absorbent layers is arranged between two layers of conventional cellulose.