DE194506C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

PATENT LETTERING.

■ CLASS 39 b. GROUP

JOSEF FOLTZER in HOLSTEIN, Switzerland.

Process for the production of artificial leather. Patented in the German Empire on August 14, 1906.

As is well known, cellulose films are already represented in such a way that a copper cellulose ammonia solution is used. through a slit-shaped mouthpiece in sulfuric acid, on a roller, which is concentrated in Caustic soda rotates, winds up, then washes with water or weak acid and dries under tension.

The present invention relates to a

ίο Process for the production of a new artificial leather, in which also a cellulose solution through a slit-shaped mouthpiece is pressed in order to be passed thereon through a precipitating liquid. But before the Cellulose mass is introduced into the precipitating liquid, it first reaches one of the Falling liquid emportauchenden rotating surface, in such a way that it is in front of the Gap of a fiber or hair blower emerges from which short-cut or powdered, Vegetable, animal or artificial fibers or hair are blown out. the Cellulose mass can, however, also be placed between the gaps between two such fiber or hair blowing machines be passed so that the cellulose tape on one or both sides with fibers, Hair, fiber or hair dust is sprinkled after the cellulose solution has precipitated in the Precipitating liquid adhere to the surface of the cellulose film formed and give it that. Give the appearance of a leather substitute.

Pas solidification of the brought into the precipitating liquid and on one or both sides

': Cellulose film contaminated with short fibers, hair, fiber or hair dust is in the Way added that the film after passing the precipitating liquid by means of rollers in a second container is performed. What he used to prevent going under strong Voltage is drawn by a concentrated solution of caustic soda or caustic potash, the consequence of which is that the dusted or fibrous film remains sufficiently pliable, in order to be able to be printed with relief patterns, be it immediately after the exit of the film from the alkali solution or after subsequent washing.

In the accompanying drawing, for example, one is more useful for carrying out the method Apparatus shown in longitudinal section.

The cellulose dissolved in copper oxide ammonia is pressed out of the container A through the gap B and falls onto the surface of a cylinder C rotating below, while the fiber or hair-blowing machines D, D ^{1 of} known construction or even just one of these machines are cut to a certain length Blow hair, • fibers, the fiber or hair dust into the layer of cellulose solution reaching C in such a way that it is sprinkled with it on both sides or only on one side. This cellulose layer, which is covered on one or both sides with fibers, hair, hair or fiber dust adhering to it, is fed from the cylinder C into the vat E , which contains a precipitating liquid formed, for example, from sulfuric acid, hydrochloric acid, acetic acid or the like.

A knife F loosens the coagulated film, which is covered with fibers, hair, hair or fiber dust, from the cylinder C, whereupon by means of the pressure cylinders G and G ^{1 it}

is pulled and passed over rollers H, I, J and K. The film is passed through a second container L , which contains a highly concentrated solution of caustic soda

or caustic potash.

A thorough solidification of the film mass takes place in the container L , as the film is drawn through the liquid in this container by means of the pressure cylinders M, M ¹

ίο which will remove the excess liquid ■ from the same. One of the rollers M ₁ M ¹ or both rollers M ₁ M ¹ can be engraved in order to press relief patterns onto the fiber-covered or fiber-dusted film.

It should be noted that the solidification of the film mass in the container L must be brought about under great tension of the film, because the film tries to contract when it solidifies; this will.by arranging the pressure cylinders G, G ¹ and M, M ¹

:.. achieved. ·. · ■■ '.-

The artificial leather obtained is then washed in a dilute acid bath to.

the last trace of copper, soda. or potash , to remove.

; . The above-mentioned relief patterns can also be pressed into the synthetic leather after this wash.

· With the. a stiff, leather-like product is obtained.

But if you want a flexible product,

as is necessary in many cases, proceed as follows:

You dissolve in ammoniacal copper oxide, which is in a mixer, up to ίο percent cellulose. After this cellulose has completely dissolved, about 5 percent of vegetable fibers (wood pulp, etc.) are added. The whole thing is mixed at a low temperature until you have a homogeneous mass, which you then bring through the gap B onto the cylinder C and otherwise, as described above, processed into artificial leather. . ■

Claims (3)

Patent claims: 1. A method for the production of artificial leather, characterized in that- on which may be pressed out of a slot-like mouthpiece in a known manner cellulose solution previously mixed with vegetable fibers before entering the precipitating liquid, any shredded fibers of any kind Origin to be inflated. 2. An embodiment of the method according to claim 1, consisting in that the band-shaped cellulose mass squeezed out of the mouthpiece the gap of a Fiber or hair blowing machine happens or between the columns of several such Devices passed and thereby. covered with the fibers on one or both sides will. • 3. Another embodiment of the Method according to claim 1, characterized in that the with fibers or Hair-covered film after passing it - a weak precipitation bath under strong tension through a concentrated solution is led by caustic alkali. - For this purpose ι sheet of drawings. '■■■ Si