US2122727A - Rubber process and product - Google Patents

Description

y 1938- T. L. SHEPHERD 2,122,727

RUBBER PROCESS AND PRODUCT Filed Feb. 28, 1936 J ffAep/w c' Patented July 5, 1938 STATES PATENT QFFEQE Application February 28, 1936, Serial No. 66,308 In Great Britain April 6, 1934 10 Claims.

This invention is a continuation in part of my main application No. 11,720 filed the 18th March, 1935, and relates to elastic rubber threads-or yarns which are intended to be subsequently used in the manufacture of fabric, clothing, lacework. and the like or parts thereof or for wearing apparel of any description.

When rubber threads are to be led into a loom or knitting machine so as to be formed into a fabric, it is very often diflicult to control the rubber threads because of the extensive and variable stretch that they possess and the result of this capacity of the thread results in the fabric when completed having a non-uniform surface appearance or causes shirring and other defects in the finished material.

According to the present invention I provide a rubber thread which is inextensible during the manufacture into a fabric, but can be treated when in the fabric so as to restore the elasticity.

The invention will be pointed out in the accompanying claims.

The invention will now be described by way of example with reference to the accompanying drawing, in which:-

Figure 1 is a section of a thread consisting of core and sleeve.

Figure 2 is a diagrammatic view of a'coating device.

The rubber thread g assumes a tubular form around a core in of material which is of a friable character which tends to maintain the rubber hollow thread g inextensible whilst it is passing into the loom and being formed into a fabric; during the subsequent finishing operations upon the fabric the core h. in the various threads will be broken up and the cohesion of its particles destroyed. In this way the fabric will obtain the stretch that it should, when finished, possess.

The normal finishing operations applied to the.

fabrics in which the threads are incorporated,

- such as are usual in a dyeing or bleaching works, e. g., rubbing or wringing, will in most cases break up into fine particles the core inside the rubber strands, but to ensure that the core is broken up, the fabrics are thoroughly manipulated and may be beetled for this purpose.

I have found that glass provides a core which is amply brittle. Other materials are glue and gelatine and similar materials which on the application of heat for instance when in the fabric will become dry and brittle and allow themselves to be mechanically broken up. A third group is the thermo-hardening resins which before the application of heat are pliable to a certain degree and on application of heat become brittle and capable of being destroyed by mechanical manipulation.

Referring to Figure 2, a core b is drawn through a bath e, such bath containing a solution it of rubber, by which in this specification is included rubber in any suitable form, such as latex or a natural or artificial dispersion of rubber particles, or a rubber solution. The completed thread is then drawn from the bath and led away for subsequent drying and vulcanizing as desired. Such a coating of rubber may be supplemented by the core and its partly applied coating being drawn again through the bath so as to increase or strengthen the thickness of the applied tube of rubber or other material.

In order to protect against cross-cutting, a coating may be applied after the rubber has been slightly roughened, knurled, or grooved, as in British patent specification No. 440,256.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

1. A process for forming a fabric incorporating elastic threads which consists in forming rubber thread by applying rubber upon a continuous filament of material which may be pulverized, incorporating the rubber threads into the fabric, and then pulverizing the filament by mechanical manipulation.

2. A process for forming a fabric incorporating elastic threads which consists in forming rubber thread by applying rubber upon a continuous filament of material which may be rendered brittle and pulverizable, incorporating the rubber threads into the fabric, rendering the filament brittle and pulverizable, and then pulverizing the filament by mechanical manipulation.

3. A process for forming a fabric incorporating elastic threads which consists in forming rubber thread by applying rubber upon a continuous filament of material which may be rendered brittle and pulverizable, rendering the filament brittle and pulverizable, incorporating the rubber threads into the fabric, and then pulverizing the filament by mechanical manipulation.

4. A thread consisting of rubber deposited round a continuous filament of pulverizable material.

5. A thread as claimed in claim 4 consisting of rubber deposited round a glass filament.

' 6. A thread consisting of rubber deposited round a pulverizable filament in which the filament consists of gelatine.

7. Athread as claimed in claim 6 in which the gelatine is in the form of glue.

8. A thread consisting of rubber deposited round a 'pulverizable filament in which the fila- -ment consists of resin.

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