DE1935137A1 - Process for the production of abrasive cloth and a suitable base for it - Google Patents

Description

Process for the production of abrasive cloth and a suitable base for this.

The invention relates to a textile underlay for abrasive cloth, the textile material having a cover on the top with phenol-formaldehyde resin, but in.die mesh or Gaps in the textile material does not penetrate.

Abrasive cloth is understood to mean a flat abrasive material and abrasive tools made from it, such as Sheets or discs, pieces of sandpaper and the like.

The term textile underlay is understood in its broadest sense and includes all fabrics made from threads, bundles of threads or pasern of natural or synthetic origins, including single and multi-thread spun threads as well as textile goods made from staple fibers. - 2 - ■

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The term meshes or spaces includes all openings in the fabric between the crossing warp and ■ Weft threads.

An abrasive cloth or sandpaper basically consists of a base, a binding agent for fixing the abrasive grain on the base and a top layer or adhesive layer for evenly anchoring the abrasive grain in place.

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The pad not only has to adhere very well to it Have binders for the abrasive grain, but also prevent its migration / this. If the binder migrates into the substrate, the result is a substrate with physical properties that are similar to those of the binder. If the binder is a thermosetting resin, the backing becomes stiff and hard as a result of this hike. In a certain way This increases the natural flexibility or pliability ... the document is impaired. Such embrittlement of the substrate leads to errors in the use of the abrasive cloth or Sandpaper, namely to the relatively low tensile strength Document as a result of a "lack of mobility of the individual "Yarn or thread.

Flexibility, tear resistance, and similar physical properties are valuable characteristics of abrasive cloth. It The most varied attempts to improve were therefore also made these physical properties are undertaken.

It showed, however, that with all the proposed and known measures, the. one or another physical property can be improved, but a general improvement in the abrasive cloth quality could not be achieved. It is about "a flexible, non-miscible separating layer on the base" on which only then is the thermosetting binder ^ ^ ■ - .: ■> u-, ^ -. HX- . ;: -. ■ -: ^ ~ r, - :; ■ -. ■ ". ■ ',. ■ .-, - ,;" iy ^ ; ^v ": 009 8 2 77110 2

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is applied. Attempts have also been made to lay to apply and plasticizers or plasticizers to be added to the binder. Ss is known (USA patent 2 805 136), textile underlays with a starch product too fill it and then treat it with a very thin or "green" plastic, after which the binder layer for the abrasive grain is applied.

So far it has always been essential, the textile underlay material for the production of abrasive cloth with an aqueous dispersion of different types of fillers, such as To treat starch, glue or clay. Combinations of one or more of these measures, such as the introduction of a Filler in the underlay, a back face or a front,

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all measures that appeared essential and necessary if relatively rigid, hard, brittle binders were to be used to fix the abrasive grain to the substrate. The main task of these measures is to prevent the binding agent from migrating into the documents and thus to prevent it from becoming brittle again. The embrittlement has a very detrimental effect on the flexibility and tear resistance of the abrasive cloth. A second reason for preventing the migration of binder lies in the anchoring of the abrasive grain itself. The migration can lead to a depletion of binder in the layer, so that the anchoring of the abrasive grain is adversely affected would.

Various methods and devices have already been used for post-treatment of these textile materials. e.g. fillers in the back, cover layer on the front and back. Two procedures have so far been carried out in generally carried out on a 2-roller mill the textile underlay over a partially in a solution of the Filler plunging roller out. When the textile material is immersed, it becomes saturated and absorbs it

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Dissolve into the mesh of the fabric and onto its outer surface. After leaving the trough for the filler solution, it runs Fabric still formed on the roll through a narrow slot from a sharp-edged knife, assigned and at an angle standing to the roll surface. This knife becomes the Filler pressed more or less into the fabric. At a 2-roller mill, the fabric runs through the slot of e.g. 2 vertically arranged rollers .. The backing layer is e.g. fc applied to the surface of the lower roller, which in a Container with the solution of the top layer runs, then arrives in the slot of the two rollers, in which the mass is then added Is squeezed or brushed with the help of the application roller.

So far, such treatment methods have therefore been used applied so that the material penetrates into the openings and spaces in the textile material and fulfills them, so that there is no possibility that the binder will still migrate. To a more or less complete impregnation with this one To ensure material, it has also been customary to date to dry this material in which the moist, coated Surface in contact with steam-heated drums or the like was brought. With such a drying process, as expected, a Migration of the filler and / or the material of this layer into the yarns and the interstices and masks of the textlien Material take place. The openings and meshes of the fabric and the yarns are then generally completely filled.

Such pretreatments of the - .. textile backing are time-consuming and put a significant burden on the production costs of abrasive cloth. Although the main task, namely preventing the binding agent from migrating, appears to have been solved, these treated textile backings have other disadvantages . . - · -:. ν ■ '■ "'.

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Filling the backing generally leads to higher strength properties compared to unfilled textile materials, but at least initially the bite resistance and flexibility are adversely affected, in other words <3Le overall performance of the abrasive material. On the other hand, this obviously leads to only a small influence on the physical properties of the abrasive material if it has already been used for a short period of time. The filling of the backing therefore does not appear to be of any real benefit and is a waste of manpower and machinery embrittlement of the substrate and Affects, as it can be assumed during the operating time of the abrasive flexibility and tensile strength to disadvantageously.

The invention now concerns the solution to the above problems with the help of a new and improved textile base for the production of abrasive cloth. The inventive The substrate retains its natural maximum flexibility to a far greater extent than with the known methods. The substrates according to the invention can therefore be used to create abrasives Manufacture with special tear resistance.

The base according to the invention is now a textile material consisting of a chain and a loop and meshes formed in between or openings which have a layer of thermosetting resin as an uninterrupted coating on the front side, which, however, essentially does not go into the machine or the gaps penetrates. The base according to the invention thus has unfilled stitches or spaces in between grades the yarn © or

Pads have great mobility.

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The invention also relates to the manufacture of the new Documents for the abrasive cloth, filling the openings and meshes of the textile material through them Coating must be avoided, so that the threads or fibers of the textile material essentially retain their flexibility and bite resistance, and this also applies to the finished product Abrasive is important.

Taking into account the previous view of the specialist, after which it is necessary to fill the textile base from the back, the one according to the invention appears Teaching that such a measure is not necessary or even undesirable when used as a binder for the abrasive grain a thermosetting resin is used, very surprising. As a result of avoiding the filling of the textile material from the reverse side, further process steps are required / but fewer in the context of the manufacture of the abrasive Cause costs·

The invention is to be explained in more detail with reference to the figures will.

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Fig. 1 shows a detailed view of a section through a

Abrasive cloth using the utensil according to the invention.

Fig. 2 shows a detailed view of a cross section of the textile base according to the invention.

FIGS. 3 and b show flow diagrams for the production of the textile supports according to the invention.

According to the method according to the invention, the front layer is applied in the form of a solution to the ^: textile material under the wiping movement, the solution

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is distributed with rubbing. It becomes relatively smooth and forms an uninterrupted layer on the surface of the textile material ^ After drying it is found that the plastic material on the textile material without significant penetration into the gaps is applied. The gaps are unfilled, the threads or yarns have their mobility. The layer material however, to a very small extent, it penetrates the surface of the yarn or thread which is adjacent.

According to a preferred embodiment according to the invention, the textile underlay has on the back of the textile Material still has a backing layer of glue on its job will be set out below. The back layer is preferably applied before the front layer. The back layer leads to better wear resistance and can optionally be filled with an 'inert filler such as calcium carbonate. Also can they improve the dimensional stability of the finished product.

The abrasive cloth 10 according to FIG. 1 contains the textile base 20 according to the invention, on which the front layer is located 28 and on which the binder layer 30 with the abrasive grain 40. If necessary, a top layer can also be applied to the Abrasive grain layer are present.

According to FIG. 2, the textile base consists of a Cotton fabric 21, made of warp thread 22 and weft threads 23, 24, 25, 26 and 27. The topsheet 28 of the present invention is relatively thin, smooth, and uninterrupted. Finally, the document indicates a relatively thin, smooth, uninterrupted rucksack 29 on the back layer. The front and back layers penetrate although something in the meshes of the crossing warp and. Weft threads, but these are not met. The thread material has sufficient freedom of movement under e.g.

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Tensile load. For the sake of clarity, the front and backing layer shown only in contact with the surfaces of the adjacent threads. The material of these layers penetrates however to a very small extent into the yarn surfaces. However, this penetration is by no means to the extent that it was observed in the case of the known methods.

The production of the base according to the invention will be explained with reference to FIGS. 3 and k . A cotton fabric 21 with the reverse side facing down is coated with an aqueous glue solution 29 on the reverse side after conventional dyeing, drying and trimming to the desired width. It runs over the roller 51 between the relatively narrow gap against the roller 50 »whereby both are rotated in the direction indicated by the arrow and have the same surface speed.

- ■■ · - ■ The roller 50 is rotatably mounted in a container for the Glue solution (not shown) for receiving the glue solution on the Surface and subsequent transfer of an excess Amount on the bottom or back of the fabric 21. Excess glue solution is removed with the aid of the doctor blade 52, which is arranged at an angle to the roller 51, stripped and at the same time the glue mass is evenly distributed over the entire web. The fabric 21 now carries the backing layer 29 made of glue. The glue layer 29 is then placed in an oven with warm Air dried tack-free, i.e. when it is touched with the finger ' the layer is no longer sticky.

The backing layer can be heated and dried in any desired manner. According to FIG. 2, the textile material runs over the rollers 53 to 56 then over the steam-heated drum 57 and, with the aid of the deflecting roller 58, is placed as far as possible around the drum ".
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A roller system 59 to 63 then follows for further tack-free drying, of which can optionally the rollers 59, 61, 63 heated and the rollers 60 and 62 for To prevent the glue layer from sticking to the roller surface, it must be cooled. The belt leaves the roller system with Room temperature. ' . .

The textile material is now wound up and is ready for the application of the front layer. . ·

It goes without saying that sticking should be prevented, that is to say that this layer should not be in direct contact with the surface of the steam-heated drum 57 while the glue solution is drying. This is ensured by appropriate arrangement of the rollers 53 » 5 ^, 55 * This means that the glue solution can be heated to a temperature significantly below about 43 ° C (HO ⁰ F), preferably below about 38 ⁰ C (100 ⁰ F), hold. As a result of these lower temperatures, more viscous solutions can be used, which are also useful for preventing migration into the textile material during subsequent heating.

After dyeing and during drying, ie before application of the glue solution, the textile material should be treated in such a way that shrinkage of at least about 2 %, preferably about 6 to 10 %, is achieved. This leads to a better dimensional stability of the base.

When carrying out the method according to the invention it is essential that the slot between the two rollers 50, 51 is open. That means the arrangement of this two rollers to each other does not lead to a pressing of the material. A slot width of about 3.1 mm for common textiles Materials, e.g. twill, are fine, but an important point is

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that the textile material 21 the glue solution from the application roller 50 wiped off and not pressed in the glue from the roller will.

The concentration of the glue solution used depends on the molecular weight of the glue. A solids content of about 50 to 70 %, preferably 50 to 60 %, is desirable for a 58 rap. Glue solution. The viscosity can be adjusted at any desired temperature by adding water accordingly. It may be between some 15OO cP (Brookfield viscometer, spindle no. 2, β rpm, 6O ⁰ C) be up to 1500OcP (spindle 4, 12 rpm, 6O ⁰ C), is preferred for the coating composition has a viscosity of 2000 + 200 cps »The glue solution should be applied in such a way that it has a dry weight

2 corresponding to the textile material is 14.75 to 59 g / m (1 to 4 lbs / ream), preferably 25 + ^ ₃ 4 g / m (1.7 + 0.3 lbs / ream).

Spreading the glue solution and scraping off excess Solution is preferably carried out with a flexible knife, which is set at an angle to the textile material is. The arrangement against the rollers determines the extent of a Penetration of the glue into the textile material and the amount of glue applied. So you can, for example, according to the invention a

2
Glue in an amount of 25 g / m with the help of a knife thickness 0.78 ram, cutting about 38 mm at an angle of 11 ° to the horizontal.

In Pig «4 there is now a flow sheet for the application of the topsheet, which is done according to the method of Fig. 3 obtained pre-coated textile material over the Roller 70 runs in and with the help of the application roller 71 with a aqueous solution of a thermosetting resin is coated.

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The applicator roller 71 runs at the web speed and immersed in a tub (not shown). Excess synthetic resin solution applied is wiped off with the aid of the knife 72. '

The synthetic resin solution is evenly distributed without it penetrating into the meshes or openings of the textile material and essentially not penetrating into the threads or yarns. There is only a very slight penetration into the surfaces of the threads or yarns that are in direct contact with the synthetic resin solution. The extent of this plastic uptake of the textile material depends on the angular position of the doctor blade 72. An angle between about ^ 5 and 60 ° (perpendicular to the surface of the base) is suitable for the application of a synthetic resin solution with a viscosity of about 1800 and 2200 cP . The knife suitable for this is about 16 mm wide and has a cutting edge of about 38 mm. It extends over the entire width of the textile material. The cutting surface is sharp and has an angle of about 60 degrees.

For the inventive method is suitable as thermosetting resin a phenol-formaldehyde resin, this front layer of the textile base is miscible or compatible with a phenol-formaldehyde binder, but is in uncured Condition not brittle. Such a synthetic resin can be obtained commercially as an aqueous solution. It's easy adjust to the desired viscosity at the intended application temperature simply by adding water. A Filler such as calcium carbonate, which is commonly used in such. Resin is applied, can be brought into the solution, ' preferably about ^ 2 volume solids in the resin solution. the The viscosity of the resin solution can be between about 1500 cP (Brookfield viscometer, spindle No. 2 at 6 rpm, 33 ° C.) to about

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15,000 cP, spindle no. K, 12 rpm, 32 ° C.), a viscosity of 2000 + 200 cP is preferred. The application rate of the front layer, based on dry weight, should be about 66.5 to 110 g / m (5.5 to 7.5 lbs / ream), preferably about 89 + 7, ^ g / m (6 + 0.5 lbs / ream).

As can be seen from the figure, / textile material can die

Touch application roller 71 tangentially or also slightly Wrap around the circumference, e.g. 10 °. In this case it is between the applicator roller 71 and the doctor blade 72 Rod or roller (not shown), whereby a better wetting of the material is achieved.

The textile material then runs over the rollers 73, 7 ** - in a drying zone, in which the water is removed and the plastic is dried.

A migration of the plastic layer into the gaps to prevent the textile material and to an undue extent in the fiber material, drying on a Drum or the like can be avoided. A suitable type of drying is that the moist fabric layer of a plurality of streams of hot air 75 across the width of the textile material is hit, i.e. perpendicular to the direction of advance of the textile material.

The material now runs under and over a plurality of cooling rollers 76, 77 ', 78 to stabilize the thermosetting Resin and to prevent undesired hardening of the layer, then it is wound up. It can now become the usual Connect manufacture of abrasive cloth.

It is important that the thermosetting resin is not dried too extensively, i.e. under hardening conditions

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is held. Premature hardening leads to a bad one Adhesion of the binder for the abrasive grain, however, must be dried far enough that the surface is tack-free and migration of the material from the front layer into the textile material prevents

The invention is further illustrated by the following examples.

example 1

A common cotton twill, awn number 76 χ 48, 12.5S warp, 18S weft, basis weight about 454 g / m ² (1 yard, 60 in, 1.38 lbs), was customarily used as a backing for making abrasive cloth dried. It was colored brown and could then shrink to 1.38 m on drying, this corresponds to 9 %. To apply the backing layer, the fabric was fed at a speed of about 45 m / min (150 ft / min) over a back-up roll through the slot with a rubber-coated applicator roll running in the same direction and speed as the fabric. An aqueous glue solution was applied, the cotton fabric wiping it off the application roller. The slot between the two rollers was relatively open and was about 3.17 ram »

In the sizing solution there was a Lößung of glue 58 mp, which was kept in a container at the temperature of about 6O ⁰ C. The viscosity was about 2200 cps (Brookfield viscometer, spindle no. 2, 30 rpm, 60 ⁰ C).

The glue solution was evenly and smoothly distributed over the fabric, excess glue solution was removed with the help of a doctor blade, which extended over the whole

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Roller and was aimed directly against the coated fabric under slight pressure. It had a strength of about 0.79 mm, angle about 16 ° to the horizontal.

The glue solution was now able to cool to about 38 ° C., the uncoated side of the fabric ran over steam-heated steel rollers and then alternately over hot and cold (room temperature) steel rollers. In this way the glue solution was about ^ -3 / at a temperature of 110 ⁰ C (230 ⁰ P).

After this tack-free drying, the fabric was in usually wound up. The application weight of the glue (Dry weight) was about 3, ^ g / m (2 lbs / ream). After this the weight of the uncoated fabric after dyeing and drying was about 25.8 g / m 2, the coated fabric

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Fabric now 29.2 g / m (15.3 or 17.3 lbs / ream).

The thermosetting resin solution was then applied using an applicator roller at a feed rate of about 150 feet per minute. This ran at the same speed and in the same direction, dipped into the aqueous solution of a phenol-formaldehyde resin with the following composition:

550 parts by weight of a phenol-formaldehyde resin solution ("Varcum .2536") 412 parts by weight calcium carbonate, 58 parts water, viscosity 2100 cP (Brookfield viscometer, spindle # 2, 30 rpm, 30 ° C).

The fabric stripped the resin solution from the applicator roller. The solution was spread evenly and smoothly and excess solution was removed with the aid of a doctor blade directed against the tissue. The doctor blade was corrosion-resistant steel, about 15.9 mm (5/8 in) thick across the width of the fabric, at an angle of about 5 °.

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The blade was beveled at an angle of about 60 C. This bevel was directed forward.

It was then see about 4.5, heated by a plurality were judged by hot air streams against the base, air temperature about 37o ° C (700 ⁰ P), in 16 sub-streams across the entire width of the base of an air heater, which is about cm was arranged above the surface of the pad.

The textile material was then passed over and under a plurality of cooling rollers to cool to room temperature and then wound up. The plastic had dried tack-free, however not ± hardened and thus against premature Hardening stabilized.

The resin solution was applied such that the dry weight was approximately 10.2 g / m (61bs / ream) for the front layer. The finished textile underlay thus had a weight of around 40 g / m (23.6 lbs / ream) with a width of 5 »37 m (53f5 in), which corresponds to a shrinkage of around 10.9 %.

A microscopic examination of a cross-section of the finished textile base showed that the gaps are not filled, glue and resin were essentially arranged on the surface of the threads of the textile material. Both glue and resin had only minimally penetrated the threads and were in contact in the meshes of the fabric not, the threads, therefore had freedom of movement.

Example 2

A cotton twill according to Example 1 was filled in the usual way from the back and then according to the invention with a Front and back provided. This product is to be examined as a comparison material. -

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The fabric was dyed, could shrink by about 6 % when dried, and was filled from the back with an aqueous solution of starch and glue in a conventional device (Tommy Dodd). The solution had a viscosity of over 100,000: cP, contained 62 % water, and had a weight ratio of starch: glue. the solids was 80:20. The moist fabric was ^{dried for approx. 48 seconds at HO 0} C under sufficient tension so that it shrank from 1.47 m to 1.38 m (57.75 or 54.25 in), ■.

) this corresponds to a shrinkage of about 6 %, order weight :;

2 of the filling on a dry matter basis 4.58 g / m (2.7 lbs / ream ^ i · / ¹⁾ The fabric then passed into a standard 2-roll mill at a speed of about 50 m / min (155 ft / min) applying a glue solution on the back side and that containing 35% of a 58 mp-glue, viscosity 170 cps (Brookfield viscometer, spindle no. 2, 60 rpm, 65 ⁰ C).

The moist fabric was on rollers 43 see at 110 ⁰ C. »;! dried for a tack-free glue layer. Application weight of the glue about 1.7 g / m (1 lbs / ream).

A front layer was then applied using a phenol-formaldehyde solution filled with calcium carbonate - 57.5 % calcium carbonate, 42.5 % phenol-formaldehyde resin - the viscosity was about 15,000 cP (Brookfield viscometer, spindle no. 4, 12 rpm, 28 ° C.), solids content 86% by weight .

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It was then dried tack-free at 10 G for 34 seconds, application weight (dry) of the topsheet about 11.4 g / m (6.7 lbs / ream). The finished textile base thus had a total weight of about 43.5 g / m (25.7 lbs / ream).

Microscopic examination of a section of this -Finished product showed that the glue and synthetic resin layers had penetrated into the interstices of the textile material and penetration into the filaments or fibers themselves also occurred to a far greater extent than the material after Example 1.

Example 3

The product according to the invention according to Example 1 and the Comparative materials according to Example 2 were compared with regard to their flexibility and tear strength.

Of each material were made and 2 samples for 2 hours in hot air at about 122 ° C (250 ⁰ F). This was followed by conditioning for 48 hours at 50 % relative humidity.

The tear strength was then determined for all samples in a pendulum drop test according to Elmendorf (ASTM D 1424-59).

The flexibility was determined according to the test method in "Clash-Berg, Modem Plastics ¹ , 'July 1944, pages 119 to 124,100.

Example tensile strength £ jj ^ flexibility

cm in the direction of the warp

1 according to the invention '4320 21

2 Comparison 2488 18

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As can be seen from the table, retained the invention textile underlay its tear resistance and flexibility.

Example k ■

The textile underlay according to the invention has now been examined in a grinding ν experience. The products according to the Examples 1 and 2 were made in the usual way with an abrasive grain layer in a binding agent, namely "5OX RESINALL CLOSEKOTE METALITE CLOTH".

To determine whether the physical properties of an abrasive cloth is influenced by the order in which the front and back layers are applied according to Example 1 a third pad was made and the front layer first applied.

All the documents became abrasive tapes 15.9 x 2260 mm prepared and then examined separately in a testing machine (Pratt-Whitney 9 "Turbine Blade Automatic Grinder"). With a 228 mm drive roller, 3 ^ 50 rpm, surface speed * K) ra / sec (8200 SPPM), steel support disc, diameter

7urde
a turbine blade made of "Inconel metal" (that is

a special nickel alloy) 38 101 mm; in loop position fixed. The grinding machine was started and the belt was lowered until it touched the turbine blade. In grinding and coolant were added to the workplace.

The grinding tests showed that with the inventive textile underlay to which the backing layer was applied first, a greater surface quality was achieved, whereby at the same time a greater cutting performance was observed.

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It is preferred to apply the backing layer first to avoid inadvertent hardening of the synthetic resin front layer. It seems essential for a good adhesion between this front layer of synthetic resin and the binder layer of synthetic resin, that the front layer is not cured but _x is dried.

Example 5

In a modification of example 1, a textile base is found produced by first applying the front layer and drying it.

This pad, which did not contain any filler, was converted into an abrasive belt (36X RESINALL METALITE CLOTH) processed. A base according to Example 2 was used as a comparative product The backing according to Example 1 was larger than that of the comparative cli sprodulc t s before the backing was on the abrasive cloth processed. In the finished abrasive, however, the tear strength of both products was comparable. It was allowed to it is believed that this is due to the fact that a non-continuous front layer is formed on drying. At the Drying on rollers promotes the penetration of the solution into the textile material, so that the front layer tends to be becomes relatively porous. In these pores or openings of the front " layer then flows the binder for the abrasive grain and thus reduces the flexibility of the threads or fibers. The lack of freedom in turn leads to less Bite resistance. Finally, the penetration of the Binders due to the lack of filler introduced from behind are held responsible for that compared to the comparison product, the material is less flexible.

' Claims

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Claims (1)

Claims 1. Process for the production of abrasive cloth with a textile material as a backing in the form of an open fabric, a binder layer and an abrasive grain layer which is fixed by the binder and optionally a top and backing layer, characterized in that a textile underlay material is used, which has a layer of thermosetting plastic on the front and optionally a layer on the back of glue, but these two products do not substantially penetrate the open meshes of the fabric and touch each other in it. 2. The method according to claim 1, characterized in that the textile material is cotton fabric and the thermosetting resin and the binder for the abrasive grain are phenol-formaldehyde resin. 3J Textile underlay for carrying out the procedure according to claim 1 or 2 in the form of a fabric made of warp and Weft threads and meshes or openings in between, g e k e η η draw t by a front layer which has not substantially penetrated into the meshes or interstices of the fabric Made of thermosetting resin and threads or fibers with good freedom of movement. 4. Textile underlay according to claim 3, characterized in that the thermosetting resin is a phenol-formaldehyde resin and the application weight is ^{about 1.7 to 6.8 g / m 2.} '. 0.09827 / 1102 IA-3.6 5. Textile underlay according to claim 3 or k marked by an additional backing layer of glue, the front layer and the backing layer essentially not touching each other when the fabric is washed. 6, process for the production of the textile base according to Claim 3 to 5, characterized in that one an aqueous solution of one on the front of the fabric heat-hardenable liarzea evenly applies without them essentially penetrates the open meshes of the fabric, and dries tack-free, ¹ ^, method according to claim $. _t thereby geke η η - * draws * that. A synthetic resin solution contains about 5% phenol ^ formal-oil resin ^ 6 % Galoiurooarbonat and $ $, yas.ger lit elBep viscosity -won about 2100 eP (according to Brook'field with spindle-Mr * 2 » JO UpK ₄ at about 3Q ^Q G) applies. © _t »method according to claim; $ ■ or?, Thereby geke η η ζ ei Q, h. e · t, $ aß roan preferably ^ or the application «n: g; Djer Vordergchie ^ t amt the liiokseite a layer of a l ^ & sung without di ^ ß this% m, wesentliehen in the open öes tissue eindi'ingt ^ aufträigt and tack-free drying 9 ». V / experience according to claim 8, characterized in that g e k e η η - _{characterized%} to UASs the fabric with glue solution before Trocknung- to approximately ⁰ G 3S cools, 10. The method according to claim 8 or 9, characterized in that a solution of a hide glue with a viscosity of at least about 1500 cP at 6O ⁰ G and a solution of the thermosetting phenol-Pormaldhydharzes with a viscosity of at least about 1500 cP at 30 ⁰ C. applies. • 0 08827/110 2 ■ bathroom Empty soap