DE750172C - Assembled core thread for producing temporarily inelastic rubber threads - Google Patents

Description

Composite core thread for making temporarily inelastic Rubber Threads The invention relates to a composite core thread for producing temporarily inelastic rubber threads.

There have been several proposals for making one Thread has been made. For example, one method of making I (autschukfäden has been disclosed in which a composite core thread is formed by a relatively weak thread held straight and a second thread in helical shape Coils wound around said straight thread, said compound Core thread passed through a rubber solution, the core thread soaked with rubber and is coated, and then the coated thread through a nozzle plate and through a second solution is drawn, whereby the surface of the rubber thread is substantially is made non-adhesive, whereupon the said core thread in short disjointed Broken fragments, which makes it easier to stretch the rubber thread will.

It is also already a method of making rubber thread with a diameter of less than 3 mm has become known to have a fiber core has, the thickness of which is relatively small compared to the thickness of the rubber thread is. In this process, the fiber core and an aqueous rubber dispersion at the same time allowed to pass through the same opening with subsequent solidification the aqueous Kantschuk dispersion to rubber threads, and it is characterized by that the aqueous dispersion from an opening directly into a coagulant bath is allowed to flow. In this process, the fiber core can consist of such fiber associations exist in which one or more types of fibers around an elementary or twisted, twisted, weak fiber core. It is executed that in this case the stretching power of the thread through the density and the diameter of the turns of the wrapped fiber is limited or depends on because after tearing of the middle core of weak fiber the fiber that is wrapped along a larger diameter and more tightly, obviously around one greater distance can be lengthened or stretched than fibers that are loose lengthways of a smaller diameter are wound.

It is fire known, rubber thread and the products of such Threads processed into fabrics 0. Like. Produce by core threads of spun Fiber are rubberized one or more times and the structure of the core threads mentioned within the rubber thread thus obtained either entirely or partially, e.g. B. through a treatment. with solvents, which are capable of being destroyed by to penetrate the rubber layer enveloping the core threads, if desired only after their subsequent treatment, such as B. weaving 0.

Compound elastic threads are also not new, the one outer sheath of rubber and a central thread that pulls together the casing is compressed in such a way that it is capable of elongation or expansion, when the compound thread is stretched.

Furthermore, a method for producing rubber threads is known, in the case of the core threads made of natural or synthetic fibers that cannot be absorbed by rubber covered with rubber, vulcanized and the core threads within the thus obtained Rubber threads, if necessary after their processing, by the action of an etching or carbonizing agents are dissolved or their structure is destroyed. The after Rubber thread produced such a process has the disadvantage that it is after Dissolving the inner core threads as a rubber thread stretched at will and therefore over its elastic limit can be extended beyond.

The temporarily inelastic isautschul; thread according to the invention does not have this disadvantage. The composite core thread used to make a temporarily inelastic rubber thread due to the precipitation of rubber dispersions on the Iver thread with subsequent partial destruction by a solvent consists of a central destructible thread part around which a textile thread is helically shaped is wrapped. which is insoluble in the solvent for the middle part of the thread is. The core thread can z. B. consist of cellulose acetate, while the textile thread for example made of cotton. If the cellulose acetate thread element is removed, z. B. by acetone, the helically wound cotton thread is used as the core thread left behind so that the rubber thread can now be stretched, but only to the point where the cotton twists disappear and the cotton thread becomes taut becomes, by changing the number of twists and turns per centimeter of destructible In the middle thread element, the controlled stretching of the rubber thread according to the Invention can be modified as desired.

The temporarily inelastic rubber thread according to the invention As a result of the helically wound core thread, a precisely regulated thread can be used Obtain elongation. By completely dissolving the middle, destructible part of the thread the elongation of the final thread product becomes uniform.

Claims (1)

CLAIM OF THE PATENT: Composite core thread for temporary manufacture inelastic Kantschuk threads due to the precipitation of rubber dispersions the core thread, the connection of which is subsequently partially reduced by a solvent gets destroyed. characterized in that the Isern thread consists of a middle destructible Part of the thread, e.g. made of cellulose acetate. exists to which a textile thread z. B. -ins 13 spacious helically coiled, which is in the solvent for the middle Part of the thread is insoluble. To distinguish the subject of the application from the state of the art is The following publication was considered in the granting procedure: German Patent specification ..... No. 613 235.