FI59442C - ANVAENDNING AV ETT STRYKMASSASKIKT FOER TILLVERKNING AV EN PRAEGLINGS- TRYCK- OCH TVAETTBAR RAOTAPET - Google Patents

Description

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ratillt · och fgllterityfl — tl '' AraOkan uthfd och utl. »krtft * n publicarad 30.0U.8l (32) (33) (31) * T7 *** r · * ββ> 1» «« - * «| W prlortt * 17.01.75 S isanan Förbundsrepubliken Tyskland (EE) P 250168U.6 (71) Feldmuhle Aktiengesellschaft, Fritz-Vomfelde-Platz U, Dusseldorf-Oberkassel, Federal Republic of Germany-Förbundsrepubliken Tyskland (EE) Bruggen, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7U) Oy Jalo Ant-Wuorinen Ab (5U) Washable raw pett suitable for embossing and printing - Präglings-, tryck- och tvattbar r & tapet

The invention relates to a washable raw wallpaper suitable for embossing and printing, the base material of which is paper, cardboard or dry felt (non-woven) coated with a coating mass layer consisting of a binder and a pigment, which layer is hereinafter referred to as a coating only.

Increasingly high quality standards are being set for the raw wallpaper material in order to satisfy the ever-increasing demands placed on the finished wallpaper. This is especially true of weight, which is becoming increasingly high in terms of printing method and model. Besides, there is an increasing shift towards making modern decoration by embossing. In addition to this, these high-quality wallpapers must still be washable, so that if they become dirty, they can be cleaned, i.e. they must also be water-resistant.

Efforts have hitherto been made to meet these requirements in that, after printing, the raw wallpaper with a standard printable coating was coated with a washable layer, usually based on plastic dispersions. However, after embossing, the washing resistance of such wallpapers was inadequate, as this additional Plastic Film may break during embossing. In addition, the wallpaper often had an unfavorable gloss effect due to the plastic film and finally such post-treatment of the wallpaper caused an expensive additional processing step which could only be performed after printing by the wallpaper manufacturer and not already during the production of the raw wallpaper.

If you want to equip the raw wallpaper with your own from the very beginning! In order to be perfectly washable even after printing and embossing, the coating must meet the following requirements: 1. The coating must give the wallpaper such a smooth smoothness3 that it is well printable in both flexographic and rotogravure printing.

2. The coating must not cause any gloss during smoothing, for example in a smoothing device or calender3a. The wallpaper industry and customers despise glossy raw wallpaper - except in special cases.

3. The coated surface of the raw wallpaper must have a good absorbency in relation to the inks, both gravure and flexographic, but on the other hand must not be too high so as not to adversely affect the brightness and adhesion of the weight. In addition, the resistance of the coating must be sufficient against the solvents of the ink.

4. The raw tape account and therefore also the coating must have embossing suitability, i.e. they must be well formable and these embossments must also remain unchanged over time.

5. The printed surface of the wallpaper must also be very washable even after embossing or corrugation, i.e. the coating surface must not be detached from the top surface of the wallpaper due to water and intensive brushing, which happens if the coating breaks during embossing.

6. The mechanical effect of washing must not cause any gloss on the surface of the wallpaper.

Individual of these requirements, such as items 1, 3 and 4, can be met by applying to the wallpaper raw paper a coating composition consisting of inorganic white pigments commonly used in paper coating, as well as common binders such as starch, casein and plastic dispersions. tetuk3i to the desired extent by post-treatment with a finishing equipment or calendar.

With hitherto known raw wallpapers and wallpapers, individual of these requirements are feasible, although there is often a deterioration compared to other requirements. Thus, for example, the above-mentioned treatment 3 provides a very high smoothness, but still involves a more or 3,559,442 less strong gloss. Above all, wallpapers to date, which meet a number of the above requirements, lack the characteristics of complete washability after embossing. This is apparently due to the rupture of the coating layer during embossing.

If an attempt is made to eliminate this drawback by substantially increasing the amount of binder in the coating, the washing resistance is improved, but complete washing resistance is not achieved. On the other hand, the specific gloss of the raw wallpaper then increases unfavorably and its absorbency with respect to the inks decreases substantially and thus also deteriorates.

There is therefore a great technical need for a raw wallpaper which no longer has these shortcomings and which meets the above requirements. In particular, it is an object of the present invention that the raw wallpaper be very embossable and yet that the finished wallpaper has complete washing resistance even after the embossing operation. On the other hand, solving this task must cause as few additional work steps as possible.

According to the invention, this problem is solved, i.e. the provision of an embossable, weight-washable raw wallpaper based on paper, maps or non-woven, with a coating roller layer formed of pigment and binder on the surface, so that the pigment in the coating layer contains 10-100% palno starch. Preferably, the non-pasted natural starch has a content of more than 40 in the pigment part of the printing coating material. However, it must be emphasized that even at relatively low concentrations of natural turf, the desired properties are clearly improved.

Surprisingly, it has been found that by using non-pasted, i.e. natural starch in the coating according to the invention, the washing resistance of the finished wallpaper remains good even after embossing and a number of improvements in the properties of the embossed wallpaper are further achieved.

Thus, when satinized with raw wallpaper, it has a very smooth and yet still matt and unpolished surface, which, due to its good smoothness and absorbency, can be printed especially with gravure printing. The fact that, despite the satinization, a matt surface is obtained which is not glossy and yet smooth is apparently based on the structure of unglued natural starch, which in this case acts as a pigment and in no way as a film-forming binder as is usually used in pasted form in coating compositions. On the other hand, the starch grain acting as a pigment is still so flexible that in satin the irregularities of the base material are filled and smoothed. The particular deformability inherent in unglued starch is also apparently the reason why the coating according to the invention does not break in embossing, as occurs when plastic dispersions are used in combination with known inorganic pigments.

4 59442

Various grades of starch, such as maize, tapioca, wheat, rye and potato starch, are suitable as non-absorbable natural starches. Particularly preferred as unglued natural starches are corn or potato starch, which are also readily available 3 and thus inexpensive,

In addition to the natural starch acting as a pigment, other inorganic pigments are used for the purpose and thus the opacity of the coating layer is increased. However, the concomitant use of inorganic pigments is not absolutely necessary, but it is a particular advantage that unglued natural starch can be used as the sole pigment and still achieve good whiteness and opacity. When using unpasteurized natural starch exclusively as a pigment, the wet abrasion value is even higher than when using inorganic pigments as an additive. A particular advantage of non-pasted natural starches is that a substantially higher volume is achieved with the same coating weight, or that, on the other hand, a very smooth surface can be achieved with less coating use.

The plastic dispersions used as binders in the coating layer are substantially known in composition and properties and are based on polymers of acrylic acid and its derivatives, e.g. they are based on batadiene-styrene copolymers.

In addition to these, there are other possible variations with other monoers, such as vinylidene chloride, viryl acetate, and the like. Small amounts of the total amount of coating can be used, namely amounts up to $ 10, even less than 20 wt.%, Non-plastic binders such as pasted starch, alginates, casein and carboxymethylcellulose to improve the rheological properties without handcuffs and washing facilities are significantly impaired. Amounts in excess of these percentages cannot be used as plastic binders only if they are made to harden in the coating to be insoluble in water, for example with a hardener.

Based on the total amount of pigment, the amount of binder can vary within relatively wide limits and is in the range of 15 to 150% by weight of the total amount of pigment. The higher the amount of binder, the better the wash resistance. Otherwise, no binder content, printability, embossability and Id-ill is to be avoided, should be too high. Particularly preferred are coating mass layers in which the proportion of binder is about 50 to 00% by weight of the total coating mass layer.

Suitable raw materials for the raw wallpaper according to the invention are the usual starting materials used in the production of raw wallpaper, such as paper, cardboard and non-doors. The latter material means non-woven mats made from textile staple fibers. Their length is greater than that of the cellulosic fiber. In addition, the longer fibers facilitate the formability in the embossing and the preservation of the embossed pattern obtained as well as improve the strength properties.

The basis weight of the base material is preferably between SD and 250 c / nx ~. coating

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the amount of coating is preferably in the range of 7 to 25 g / m 2 and can also be applied in several layers with conventional coating equipment. However, it is particularly advantageous if one coating layer 3 is sufficient and achieves good smoothness, good embossability and wet abrasion value. Since the raw wallpaper already illuminates and can do this coating, and no additional coatings are required after printing and embossing, the raw wallpaper according to the invention achieves a rather significant simplification and reduction in production.

The invention is illustrated by the following four examples, in which Examples 1 and 2 relate to the raw wallpapers according to the invention and to Examples 3 and 4 for comparison without the usual preparation without using the non-paste plaster starch characteristic of the invention.

Washability and washing resistance have been determined in each case with a wet rubbing machine using a wet rubbing device, which operates as follows:

The wet rubbing device used for the test, as it is commonly used in the tape industry, consists of a smooth substrate, for example a glass substrate, on which a pre-printed and corrugated wallpaper is placed with the printed side facing upwards. A well-sealed container is placed on top of the sample and the container is filled with water so that there is a layer of water several centimeters thick on the top surface of the wallpaper. A circular brush is placed on the surface of the wallpaper under water, which, after starting the device, draws a circle on the surface of the wallpaper. The brush is pressed against the surface of the wallpaper with a certain constant force. With the help of lighting devices, the wallpaper can be illuminated during the experiment from below through the wallpaper as well as from above. The number of turns necessary to remove the first visible particles from the surface layer is measured.

Example 1 2

A three-layer coating board with a surface pressure of 140 g / m was applied with an air brush in an amount of 15 g / m after drying, having the following composition:

Binder: 120 parts by weight on a dry weight basis of a 50 kg plastic dispersion consisting of butadiene-styrene-3 copolymer 5 parts by weight of oxidatively decomposed maize starch pigment: SO parts by weight of natural maize starch 20 parts by weight of calcium pigment as inorganic

the cardboard raw material an treated with the above-mentioned coating on the upper surface was satinized at a pressure of 130 kp / cm, and its surface was then very smooth, but completely matt, and very well printable. The raw wallpaper had a wet abrasion strength of 450 to 530 turns before embossing, after embossing 6 59442 it had a wet abrasion strength of 400 to 40 turns. No gloss development was observed at the locations where the wet-abrasion test was performed.

Esimerldd. 2 On a coating raw paper consisting of 40 parts of groundwood and 60 parts of cellulose with a basis weight of 120 g / m, an air-brushed layer of coating material was applied in an amount of 12 / m after drying, having the following composition: Binder: 120 parts by weight calculated on a dry basis, from a 50 # plastic dispersion consisting of a copolymer of methacrylate 5 parts by weight of oxidatively decomposed starch Pigment: 100 parts by weight of natural maize starch

After drying and satin, the wet abrasion strength of the wallpaper was 540 to 570 rpm. which did not substantially deteriorate as a result of the embossing.

Example 3

Comparative test without natural starch as pigment:

The coating board according to Example 1 was coated with a coating material amount of 15 ε / m, calculated as Imva, having the following composition:

Binder: 120 parts by weight on a dry basis of the plastic dispersion according to Example 1 5 parts by weight of the oxidatively decomposed starch according to Example 1 Pigment: 80 parts by weight of precipitated calcium carbonate 20 parts by weight of calcium silicate The crude wallpaper thus prepared was uncoated. Despite the strong polishing, there was a less smooth and dense surface after satinization than in Example 1. The printability by gravure printing was unsatisfactory due to poor smoothness.

The abrasive strength was 180 revolutions, after embossing the wet abrasion strength decreased to 35-45 revolutions.

Example 4

A plastic dispersion based on methacrylic acid copolymers was applied to the coating raw paper corresponding to Example 2 with an air brush in an amount of 8 g / m 2 of dry coating.

The raw wallpaper 11a thus prepared, already unsaturated, had an unsatisfactory surface finish and an insufficient alley. Satinization hardly achieves greater smoothness, but then the surface gloss increased. The raw wallpaper account was

Claims (4)

59442 rioii.iattoiaan Ankle shear strength 200 revolutions, embossed diatom Ituna it was 120 Id.cnx> 3ta. Due to the insufficient smoothness, the wallpaper could only be printed unsatisfactorily with gravure printing and had a poor print with pressed stripes due to the lack of color absorption in the flexographic printing. 1. Präglings-, tryck- oc tvtvbar rätapet bestäende av papper, karton eller non woven säsom basmaterial, Som är överdraget med ett strykmassaskikt av plastbindemedel och Pigment, känneteck-n adärav, att 10-100 wt-% av pigmentandelen i strykmassasket Nativ oförklistrad starch. A washable raw wallpaper suitable for embossing and printing, based on paper, cardboard or a non-woven foam coating coated with a coating mass layer consisting of a plastic binder and a pigment, characterized in that the coating mass composition layer 00% by weight of unglued natural starch grains. 2. Rätapet enligt patentkravet 1, kännetecknad därav, att der nativa etherklistrade stärkelsen utgör up to 40 wt-% av pigmentandelen i strykmassaskiktet. Raw wallpaper according to Claim 1, characterized in that the non-pasted natural starch constitutes more than 40% by weight of the pigment part of the coating mass layer. 3. Rätapet enligt patentkraven 1 och 2, kännetecknad därav, att pigmentandelen i strykmassaskiktet i sin helhet bestär av oförklistrad stärkelse. Raw wallpaper according to Claims 1 and 2, characterized in that the pigment part of the coating layer consists entirely of non-pasted natural starch. Raw wallpaper according to Claims 1 to 3, characterized in that the non-pasted starch of the coating layer is maize or potato starch. 4. Rätapet enligt patentkraven 1-3, kännetecknad därav, att den oförklistrade stärkelsen i strykmassaskiktets Pigment-andel majs- eller potatisstärkelse.