DE19732735A1 - Process for the production of multi-layer tissue paper products - Google Patents

Abstract

A process for producing multi-layered tissue paper products with increased softness comprises the following process steps: production of layered webs of tissue paper, assembly of the layered webs to form a multi-layered web of product which is untreated with respect to softness, and printing of the web of product in the dry state with a softening lotion having the following minimum composition in percent by weight: a quaternary ammonium compound 3 to 30 %, siloxane foam suppressor 0.1 to 3.0 %, aloe vera powder 0.1 to 10 % a polyhydroxy softener, in particular polyethylene glycol 0.05 to 5 % remainder water.

Description

The invention relates to a method for producing multilayer tissue Paper products, especially cellulose handkerchiefs, with increased Softness.

In the course of ever higher quality and comfort requirements for tissue Paper products play - depending on the intended use of the product - in addition to improved absorbency and tear resistance, the highest possible Softness plays an increasingly important role. This is especially true for pulp Handkerchiefs important, because it is precisely the part of the nose that affects people Runny nose is particularly sensitive.

From the prior art, e.g. B. EP 0 239 910 A1 or WO 93/09287 A1 discloses a soft absorbent tissue paper to produce by the pulp containing the pulp a che Mix softener solution is added, for example a quaternary ammonium compound such as diethyl ester-dimethyl-am monium chloride and a polyhydroxy plasticizer, such as. B. Polye ethylene glycol in one percent solution. Depending on the composition the effective mixture components of this solution can in addition to Improve the softness of other product properties, like a he increased wet strength, biodegradability, etc. can be achieved.

The addition of the plasticizer solution in the wet area of the paper machine has some drawbacks, however. So are the effective ingredients  distributed over the entire volume of the tissue sheet, which means bezo a high amount of plasticizer added to the amount of paper fiber must be. Furthermore, those in the solution must be positive charged molecules of the quaternary ammonium compound the negative ge Neutralize loaded fibers in the pulp. This leads to one excessive consumption of softener solution. The ultimate remains with ei ner addition of z. B. 11 kg of active plasticizer per ton of paper pulp only 0.4 kg is left as an active ingredient in the product. The Known methods therefore show a high loss due to the addition of Weicheimacher solution "at the wet end" of the manufacturing process.

Based on this problem, the invention is the The task is based on a method for producing multilayer tissue pa Pier products with increased softness to indicate a more economical Consumption of plasticizer substances brings with it.

This object is achieved by the method steps specified in claim 1, namely:

• - making sheets of tissue paper,
• - Combining the layer webs into a multi-layer, with respect to the Softness untreated product web, and
• - Printing the product web in the dry state with a softening lotion of the following minimum composition in percent by weight:
  • - a quaternary ammonium compound 3 to 30% - Siloxane foam suppressor 0.1 to 3.0% - Aloe vera powder 0.01 to 10% - A polyhydroxy plasticizer, especially polyethylene glycol 0.05 to 5% - rest of water

A preferred quaternary ammonium compound has the formula

and mixtures thereof, where each R substituent is a C ₁ -C ₆ alkyl or hydroxyalkyl group or mixtures thereof, where R is preferably selected from a C ₁ -C ₆ alkyl, where R ¹

or is a C ₁₃ -C ₁₉ hydrocarbyl group or mixtures thereof, preferably R ^{1 is selected} from C ₁₆ -C ₁₈ alkyl, where R ^{2 is} a C ₁₃ -C ₂₁ hydrocarbyl group or mixtures thereof, wherein R ^{2 is} preferably selected from a C ₁₃ -C ₁₇ alkyl and wherein X ^{- is} a compatible anion, preferably chloride or methyl sulfate. Diethyl ester dimethyl ammonium chloride can be cited as an example.

Advantageously, the printing on the product web Plasticizer lotion applied practically only on the surface where it is used ensures pleasant tactile properties of the paper product. The Consumption of plasticizer lotion compared to the prior art can be halved, for example, by applying 5.5 kg per ton of paper become. This amount is practically loss-free due to printing  on the end product again. Corresponding titration experiments on a fourla Some cellulose handkerchiefs have been found to vary from this amount find the two outer layers of 5.3 kg per ton of paper, while in the two inner layers the plasticizer occupancy is only 0.1 kg per Ton of paper.

Due to the specified chemical composition of the plasticizer loti Various advantages are achieved, some of which are related come to fruition with the printing process. That's how one becomes state of the art much higher proportion of siloxane Foam suppressor used. Traditionally this is Foam suppressors only used in the packaging process for suppression of the pressure caused on the product To worry about foam. However, since the packaging step is a comparative one low load on the product, low proportions are sufficient of the foam suppressant. Typically, the siloxane Share there at 0.01 percent by weight, i.e. about 1/10 of that in the Erfin specified case. This high proportion of siloxane works Foaming in the printing process counteracts that one by far represents a higher load on the product than the packaging mentioned process.

In this context it should also be noted that contrary to the Expectation due to the high addition of the siloxane foam suppressant Surprisingly, the plasticizer lotion is not sensitive to shear speed and no impairment of the so-called droplet penetration shows. The latter is synonymous with the ability to absorb and  hydrophilic properties of the tissue paper product according to the invention remain practically unchanged compared to untreated products.

The advantages of the invention can be summarized as follows:

• - Less use of softening lotion
• - The softener lotion leaves no unpleasant fat-like Ge ruch back.
• - The hydrophilic properties and the absorbency of the tissue Paper product are not affected.
• - The softener lotion is applied by means of a print not sensitive to shear.
• - The process uses inexpensive chemical substances.

A preferred foam suppressant is polydimethyl siloxane, which is named for this purpose from the prior art.

Due to the acidic setting of the plasticizer lotion, the use of preservatives in the tissue paper product the. However, gravure rollers are then used for the printing process with a corrosion-resistant surface (e.g. made of ceramic material) turn.

By using calcium chloride and a soil release agent the viscosity of the emulsion is adjusted and storage stability is achieved.

With regard to the printing process, it is advantageous to work with gravure rollers which apply the plasticizer lotion to the outside of the multi-layer product web. Weight per unit area in the range of 0.5 to 6.0 g / m ² on each outside should be selected for the desired softening effect.

The invention is based on an exemplary embodiment ago explained.

To produce a multi-layer cellulose handkerchief, layers of tissue paper are first produced in a completely customary manner on a paper machine. This requires no further explanation. It should only be noted that the basis weight of the ply webs is in the range of approximately 12 to 18 g / m ² .

Four such ply sheets become a four-ply in the dry state gene, untreated product web combined, the layer attachment done by an embossing process, such as. B. in EP 0 755 212 A1 is written. The disclosure content of this document is included here pulled.

The dry product web is finally carried out by a pair of rotogravure rollers, which apply a plasticizer lotion to the two outer sides of the product web, each with a basis weight of 1.7 g / m ² .

The plasticizer lotion has the following chemical composition:

• - Diethyl ester dimethyl ammonium chloride in the form of NN-Di (Tallowoyl-oxy-ethyl) -NN-dimethyl-ammonium chloride with 3 Ge percent by weight.
• - A siloxane foam suppressant in the form of polydimethyl siloxane 0.5 percent by weight.  
• - Aloe vera powder with 8 percent by weight.
• - a polyhydroxy plasticizer in the form of polyethylene glycol with 2 Weight percent,
• - Hydrochloric acid with 0.02 percent by weight
• - A soil release agent with 0.5 percent by weight
• - Calcium chloride with 0.2 percent by weight.

The following should be noted about the connections used:
More detailed information on the polydimethyl siloxane as foam suppressant and the soil release agent can be found in EP 0 239 910 A2, the disclosure content of which is included here in this regard.

The polyethylene glycol can be a commercial product with the designation "PEG 4000" from BASF, Ludwigshafen, DE the. As a 50% solution in water, the same product under the Be drawing "PEG 4050" distributed. If the polyhydroxy plasticizer in this form is used, the proportions in the chemical The composition of the plasticizer lotion according to the invention corresponds double accordingly.

The aloe vera powder is a highly concentrated aloe Vera form, which is about 200 times the concentration compared to that of Squeezing liquid available from aloe vera corresponds.

Furthermore, the above-mentioned plasticizer lotion per se actually has very good bactericidal property. This is not just due to their pH  Value, but rather based on the nature of the active ingredient itself and the polyhydroxy compound.

Claims (10)

1. A process for producing multi-layer tissue paper products, in particular cellulose handkerchiefs, with increased softness using the following process steps:

• - making sheets of tissue paper,
• - Combining the layered webs into a multilayered product web, which is untreated in terms of softness, and
• - Printing the product web in the dry state with a softening lotion of the following minimum composition in percent by weight:
  • - a quaternary ammonium compound 3 to 30% - Siloxane foam suppressor 0.1 to 3.0% - Aloe vera powder 0.1 to 10% - A polyhydroxy plasticizer, especially polyethylene glycol 0.05 to 5% - rest of water

2. The method according to claim 1, characterized in that the quaternary ammonium compound has the formula
and mixtures thereof, where each R substituent is a C ₁ -C ₆ alkyl or hydroxyalkyl group or mixtures thereof, where R is preferably selected from a C ₁ -C ₆ alkyl, where R ¹
or is a C ₁₃ -C ₁₉ hydrocarbyl group or mixtures thereof, preferably R ^{1 is selected} from C ₁₆ -C ₁₈ alkyl, where R ^{2 is} a C ₁₃ -C ₂₁ hydrocarbyl group or mixtures thereof, wherein R ^{2 is} preferably selected from a C ₁₃ -C ₁₇ alkyl and wherein X ^{- is} a compatible anion, preferably chloride or methyl sulfate. 3. The method according to claim 2 or 3, characterized in that the quaternary ammonium compound is a diethyl ester dimethyl ammonium is chloride. 4. The method according to any one of claims 1 to 3, characterized that the siloxane foam suppressor is a polydimethyl siloxane. 5. The method according to any one of claims 1 to 4, characterized that the plasticizer lotion is acidified, especially by adding administration of 0.01 to 0.05 wt .-% hydrochloric acid. 6. The method according to any one of claims 1 to 5, characterized that the plasticizer lotion contains a soil release agent in a proportion of 0.1 up to 1.0% by weight is added. 7. The method according to any one of claims 1 to 6, characterized that the softening lotion calcium chloride in a proportion of 0.01 to 1.5 wt .-% is added.   8. The method according to any one of claims 1 to 7, characterized that the softener lotion with the help of gravure rollers on the outside side of the product web is applied. 9. The method according to claim 8, characterized in that the Weichma cherlotion with a weight per unit area of 0.5 to 6.0 g / m ^{2 is} applied to each outer side. 10. plasticizer lotion, in particular for use in a method according to one of claims 1 to 9, characterized by the following minimum composition in weight percent:

• - a quaternary ammonium compound 3 to 30% - Siloxane foam suppressor 0.1 to 3.0% - Aloe vera powder 0.1 to 10% - A polyhydroxy plasticizer, especially polyethylene glycol 0.05 to 5% - rest of water