DE308089C - - Google Patents

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PATENT OFFICE.

PATENT LETTERING

- JVl 308089 .- CLASS 8 h. GROUP

A method for producing artificial leather by impregnating fabrics with felt-like surfaces is known, this fabric being impregnated with a cellulose solution and the m'li cellulose-impregnated fabric then being dried and rinsed out by evaporating the excess moisture. This method is based on a tissue that denr

ίο Imitation leather expresses its character by being easy ^{to tear along the 1} thread of the fabric. The cellulose solution is further dried only by physical means ^"or;. Fixed so that the resistance of the final product is a small well one has proposed to pass the finished product by rolling, but only for the purpose of smooth, pliable and shiny fabrics to obtain an external refinement that does not improve the internal quality. The artificial leather product must be relatively expensive, because it is based on a fabric.

»5 'panels, belts made of plant, animal or mineral fibers of any length, to lay them in the form of a pile on a layer of adhesive, to press them and to cover them with a layer of adhesive and then a layer of pile until the required thickness is reached. The thin cardel pile does not only require a support (running sheet), because it has no inner hold, but several layers are necessary for a product. The product thus consists of _: Layers, has only a relative strength, is not: homogeneous and, conditionally, not a cumbersome, cumbersome device for its production. . ; _: .. - "*.

In contrast to known diegee ^ \ out the method is according to vorliegen- 'the invention, according to which a demand all directions equally strong, "unbreakable homogeneous product is formed. The method of the invention for the manufacture of a parent ⁴ ^ certificate closed structure, such as, for example, artificial leather, felt and Japanese paper imitation, is based on the fact that a carded felted fiber pelt is fed to a finishing machine which, under pressure, converts the fiber pelt into a cellulose solution, e.g. B. a viscose or copper oxide ammonia - cellulose solution, rolled in and then through a cellulose hardening liquid, e.g. B. a lye or acid bath leads. The result is an extremely solid product with a closed structure. The carded fiber pelt can be made from; unbleached, from only slightly bleached or from completely bleached and waterproof post-treated, uniform or. different Go colored fiber material, such as B. cotton, ramie, raffia, wool, silk or artificial. ", Silk waste, be made.

For example, one uses

exercise the procedure shown in the drawing. for example, the finishing machine shown. On a single or double card (not shown in the drawing) • 5, the starting material is carded in the usual way to form a thoroughly even fiber pelt. Directly behind the card or card there is a flow cross-laying table (also called cross-pelt or blamire-machine), which criss-crosses the fibers, which are laid in the longitudinal direction and which are dispensed by the card pucker, around the well-balanced fiber pelt produced in this way in winding form A of a finishing machine C. feed, which has two press rolls B, B ¹ mounted under lever device /, / and load weights K , one of which is roughened or corrugated, the other is provided with a rubber coating. The lower roller B ^{x of} this finishing machine C is immersed in a trough D which is filled with cellulose solution. This cellulose solution serves as a binding material for the fiber pelt passed through between the press rolls B, B ¹ by means of a feed table E. The lower roller B ¹ , which is immersed in the trough D , feeds the cellulose solution to the fiber fur, exactly as the finish or the size is fed to a fabric in the finish. The upper roller B presses the mass into the felt layer; the excess runs back into trough D. When using one of the cellulose solutions mentioned above, under the action of the pressure of the press rollers B, B ¹ , which apply the binding agent, the matted fibers adhere so well together that the product easily passes through at high speed, advantageously in a tensioned state Trough F can be passed, which contains a hardening liquid for the dissolved cellulose. The continuous product released by the rollers G, G ¹ can then immediately be wound up on a shaft Ii or folded into a container, where it is washed and treated further, and then under tension. to be dried and finally embossed. The finished product is almost unbreakable due to the combined effect of the flow cross-bed table, the cellulose solution, the press rollers and the hardening liquid and is soft and pliable ", especially if one starts with a fiber fleece consisting of -ung, -bleached or only slightly bleached fibers Artificial leather has a closed structure and can be made waterproof by subsequent treatment, or water-repellent agents can be added to the cellulose mass. and sets up the finishing machine in such a way that one of the press rolls B, B ^{1 is} only roughened or grooved in places or stripes and then smooth again in places the fiber material closer together but where the smooth surface of the press rolls acts, i.e. less binding compound is applied, there is less sticking together, so that after drying, the fibers are exposed again by scratching on the surface and over them at the less glued places the glued strips. or areas can be brushed away, resulting in a nice, long-fiber felt and also "imitations of fur. If so much cellulose solution were applied that a substantial excess is squeezed off by the press rollers B, B ¹ , then the product would be too strongly glued," If you want to make a product that looks similar to Japanese paper, you have to add a suitable percentage of bleached cotton to the unbleached fiber material to be processed into fiber fur Depending on the ratio of the bleached to the unbleached fiber material, a more or less tough parchment-like Japanese paper is obtained B, B ¹ does not 'penetrate into the cells of the fibers, but only envelops the fibers and binds them without substantial saturation. When using bleached fiber material, however, which as a result of the previous bleaching no longer contains any fatty or waxy substances and can therefore be easily wetted, the cellulose solution penetrates into the cells of the fibers and binds them together to form a stiff, parchment-like product. Products that do not have the crackling paper character can also be obtained, despite the fact that bleached fibers are used as the starting point if one uses this fiber; makes the material water-resistant beforehand according to a well-known process, in order to prevent the finishing compound from penetrating the • fiber cells. Finally, the: dried and possibly bleached leather and; Felt imitations are expediently still, with a cold sulfuric acid bath of 50 to

60 ⁰ After washing and pressing, passed through a soda or potassium hydroxide bath while still moist. This treatment makes them quite waterproof and translucent.

Claims (3)

Patent Claims: 1. Process for the production of artificial leather and similar fabrics, characterized in that a carded 'ter felted fiber pelt of a finishing machine is supplied, which under pressure the fiber fur a cellulose solution rolled in and then passed through a cellulose hardening liquid. 2. The method according to claim 1 for the production of felt and fur imitations, characterized in that the fiber pelt is made from long-staple fiber material is produced and the pressure of the finishing rollers by a strip causes smooth press roller in cooperation with a roller with rubber coating and only as much cellulose solution is rolled in as absolutely necessary for gluing is necessary so that the not too intimately bonded fibers in the product are exposed again by scratching or brushing can be. 3. The method according to claim 1 for producing a Japanese paper imitation, characterized in that the felted fiber pelt, at least partially,; from ge, bleached fiber material is made, and that produced on the finishing machine The waterproofing product is subjected to an after-treatment in such a way that that it is through a cold bath of sulfuric acid from 50 to 60 ° Be and after washing and pressing through a lye bath is passed through. 1 sheet of drawings.