DE627818C - Process for the production of rubber threads and their processing products - Google Patents

Description

Process for the production of rubber threads and their processing products According to the patent 613 z35 rubber threads are produced in that core threads Made of natural or synthetic fibers covered with rubber, vulcanized and inside of the rubber thread obtained in this way, optionally after its processing, the Core threads are destroyed in their structure.

This destruction of the core threads can, for. B. by treatment with Solvents are made, which through the rubber layer enveloping the core thread able to diffuse through. In addition, -the used as core threads Natural or synthetic fiber threads, before covering with rubber, also with acid or alkali or the like. Pretreated and dried and after covering with rubber Exposure to heat, exposure or the like can be worn down or dissolved. as well can be the type mentioned after a treatment in the interior of the rubber threads any core thread residues still present by post-treatment with solution or Detergents are removed.

So you can not only use pure rubber threads in this way, but also obtained elastic processing products, which are suitable for the most diverse Purposes in which a continuous elasticity of the products is important can be.

In the course of further work it has now been found that in one certain procedures are also possible and offer special advantages depending on requirements can, if you remove the core threads as part of the aforementioned procedure only at individual points of the same or of the processed products or respectively Makes finished goods. This allows the most diverse so far at all combinations of partly elastic and partly non-elastic combinations that cannot be produced Achieve products such as rubber mesh, rubber braids and the like.

Such an only partial elasticization of the core threads containing rubber threads or fabrics o. The like. Can be in the simplest By making those places which are supposed to remain inelastic, with gelatin or glue solution or other. Plant or animal slimes covered and so against the action of the agents intended for the detachment of the core threads to be protected. The known screen printing method has proven to be the most appropriate in this regard after the so-called screen printing process proved.

Also in the context of such a procedure can then, as in the sense of the method according to the main patent, the weils desired to the JE agencies taking place removal of the core threads and related Elastischmachung of the material not only on the threads as such and their wide variety of processing products, and in make appropriate intermediate stages of the same, but .z. B. also on the wrapped, dusted with fiber dust or otherwise still further interwoven material can go ahead. But here too, as in the context of the process according to the main patent, care must be taken that such means are used to destroy the structure or remove the core threads, e.g. B. organic solvents are used which do not attack the wrapping or dusting material as such, or that conversely the core thread material differs accordingly from the fibrous wrapping material.

In this way, z. B. also bandages, belts and bandages produce that are partly flexible, partly shape-retaining in the end product and so conditions meet in a way that has not yet been achieved at all with such materials could become.

The implementation of the present invention is exemplified below Description explained in more detail: As a core thread for the one to be formed Rubber thread becomes a spun thread of normal strength and, if possible, of a round cross-section made from acetyl cellulose. This core thread is expediently first prepared with a wetting agent to increase its water absorption capacity, and then drawn through a bath filled with an aqueous rubber dispersion. These Dispersion can e.g. B. have the following composition: -ioo parts rubber milk (based on dry matter), 1 part colloidal sulfur, 2 parts zinc oxide, 1 part Accelerator.

The bath is most suitable when it has the viscosity of crude oil having. After passing through this bath, the rubber-coated thread will pass through a suitable stripping device, e.g. B. a nozzle or a slot, guided, to remove any excess rubber and apply the rubber coating to the desired strength. Then the one provided with the rubber coating Core thread without coming into contact with any roll bands or the like until for final drying in a drying room filled with drying air at around 60 ° out, whereupon the surface of the thread is smoothed in a special device and with talc, soap dust or the like. is powdered to make it sticky and be able to reel it up without further ado.

After winding a sufficient length of thread, that can Strand removed from the reel and finally with a rubber dispersion used in each case corresponding temperature of vulcanization, e.g. B. for q.o to 6o minutes at 8o °, be subjected.

The combined thread thus obtained is thereupon, be it that he was previously spun or dusted or not, on a web, Knitting, knitting or the like machine processed further and the structure thus obtained then at the points that retain the embedded core thread, i.e. inelastic should remain, with one of the usual gelatine for the so-called screen printing process or glue preparations, such as. B. the so-called British gum, tragacanth gum, gum arabic or the like, printed, painted, coated or otherwise 'prepared on its surface.

After the applied preparation has dried on, the entire Formed by a liquid having a dissolving effect on the core thread, e.g. B. acetone or a mixture of methylene chloride and methyl alcohol, in the case of Core threads made of acetyl cellulose, filled extraction system, e.g. B. such from Soxleth type, headed at around 40 °. The structure is left in this for so long until the dissolving liquid has sufficiently dissolved the core thread material.

In this way are the unprepared areas of the entire structure sufficiently extracted, the preparation coating is then simply washed out removed, and there is the desired, partly elastic, partly inelastic product before.

Claims (2)

PATENT CLAIMS: i. Process for the production of rubber thread and their processing products by covering core threads made of natural or synthetic fibers with rubber and destruction of the core threads within the rubber thread thus obtained or its processing products according to patent 613 235, characterized in that that the core threads contained in the rubber threads or their processing products destroyed or destroyed only at the desired points in their structure. removed and in this way, structures of a partly elastic, partly inelastic nature are produced. 2. The method according to claim i, characterized marked that those Place the structures covered with rubber, which contain the embedded core thread should be retained and thus remain inelastic, prior to the removal of the core threads Serving treatment coated with a substance that protects against removal are removed after the later destruction or removal of the core threads can be.