DE431924C - Process for the production of rayon from rayon - Google Patents

Description

In the manufacture of rayon one intends to take into account the various properties come close to natural silk and, if possible, even surpass it. In the meantime the natural silk types also have different properties from one another, "such as tussah silk and china silk; they possess With regard to rayon, however, all have the advantage that the separate threads have a lot are finer. It is due to this fact that mixed fabrics only slightly occurrence.

Tussah silk has the coarsest threads of all natural silk types and therefore would in the first place come into consideration for the stated purpose. But now wise Tussah and rayon show a significant difference, especially in terms of of different behavior in the same bleach baths. Tussah silk keeps it a creamy brown color, while rayon turns almost clear white.

It has now been found that artificial silk has a corresponding brown cream color takes and even after normal bleach keeps, if you have a certain amount of spinning Percentage of caramel or substances containing a significant amount of caramel adds. This addition can be made to viscose, to the spinning bath, and to both.

The caramel can be made in several ways; It is also possible to use waste products from sugar production, which also contain a dark brown caramel, or molasses, which are heated ^{to over 100 ° C. for some time for the purpose of better caramelization.}

When using this molasses, the surprising phenomenon emerged that the in an acid salt solution with the additive mentioned not just one thread Creamy brown color, but also great suppleness and a calm Gloss, which makes this product different from other products.

This particular effect could be the nitrogen compounds present in the molasses be attributable to such. B. betaines and amido acids, which bind metals and acids act and in this way exert a particularly beneficial influence on the product could.

At a bath containing sulfuric acid 8 percent, 8 percent magnesium sulfate, 8 percent sodium sulfate and 1 percent zinc sulphate, for example 4 percent of a caramelized at 125 ⁰ C molasses were added. With this bath, raw viscose was spun in the usual way, using an artificial 6a

silk with a calm sheen and full grip. Depending on the color you want you can add more or less caramelized molasses. You can also use the molasses add immediately to the viscose.

Claims (2)

Patent Claims: i. Process for the production of rayon from viscose, characterized in that, ίο that one of the viscose or the preferably consisting of acidic salt solutions Spin bath or both substances containing a small amount of caramel or a substantial amount of caramel 'adds. 2. The method according to claim 1, characterized in that caramel-containing Add molasses, which, if necessary, are heated above 100 ° C for some time Has.