DE476998C - Process for the preparation of rubber or for the production of objects from rubber, as well as the vulcanized and unvulcanized objects produced by this process - Google Patents

Description

Process for the processing of rubber or for the # .production of Articles made of rubber, as well as vulcanized articles made by "" this process and unvulcanized articles The invention relates to a method for processing of rubber and for the manufacture of articles from rubber as well as the after vulcanized and unvulcanized articles produced by this process.

The new method is based on the knowledge that, if fresh coagulated raw rubber, for example coagulated latex from Hevea Brasiliensis, here called "coagulum", in a thin layer of air or a similar medium is exposed, solidifies after a short time.

This makes it possible to apply a method to coagulum that is similar to glass blowing, with the solidification path being a solidification path (by the action of the air, the drying effect of which is mainly due to the weight falls) must be thought of as a replacement.

According to the invention one proceeds in principle that from coagulum first a hollow body is formed, the walls of which with the help of a gaseous, liquid or solid pressure medium. Will the pressure now for some time sustained in the expanded body, the walls are solidified, and the When the pressure is reduced or eliminated, the body retains the one it assumed Shape. The time during which the pressure is applied in order to achieve a sufficient. Solidification must be applied is mainly a function of the atmospheric Condition and wall thickness. Generally it is on the order of seconds and minutes. It can be completely dried during the printing period, but it can this is also done after removing the pressure.

When using the procedure described in general terms above one can make advantageous use of another property of the coagulum, namely, that skins of this material, compressed under slight pressure, are very good stick together. Although the invention is in no way limited to this, is one in practice, then "also preferably proceed as follows.

Koagulum skins, which can be preserved in any way, i.a. by coagulation, for example of latex in very shallow containers Cutting up coagulum or by rolling are applied to the Margins compressed or squeezed, leaving a small opening. In this opening is now brought to Ida's mouthpiece of an air pump and the one obtained Inflate the bag until the desired wall thickness is achieved. - After some time the mouthpiece is removed from the inflated balloon, whereby it collapses, but retains its shape .. The resulting large surface now enables a quick drying.

You can use the described process to produce a semi-finished product, namely dried raw rubber, prepare as well as finished products. In the latter Case one will give the initial object such a form that from it after Inflate the desired object. You can also use hollow molds, which match the object to be manufactured, the shapes possibly can be evacuated.

In general, this method is only suitable for making it simpler Objects such as play balls, pneumatic tires for bicycles and automobiles, however, can you can also make parts of complicated objects according to it, which then turn into one Whole to be united. It has been shown that the manufactured in this way Rubber heads and objects are much tighter than other rubber heads Average.

The main advantage of the procedure after. the invention must, however, in its simplicity can be seen, and the application of the procedure is even so simply that the manufacture of rubber articles can be carried out immediately from now on Places of discovery of the milky juice, i.e. on the plantations themselves, can be made. The production of dried coagulum in pelts as a semi-finished product can be carried out according to the Invention - happened much faster than usual; the product received is at least equal to the so-called »Blanket CrApes«.

It is clear that the articles made according to the invention are excellently suited for vulcanization by cold means, e.g. B. for vulcanization with the help of vapors of chlorosulphur and for gas vulcanization according to P e a c h y, the rubber alternating between an atmosphere of hydrogen sulfide and Exposure to sulfur dioxide. Also the vulcanized ones made according to the invention Objects generally have a greater tightness than those which are through Calendering (rolling) or obtained directly from latex by vulcanization.

The articles produced in the manner described can be used in be embellished in a known manner by painting or staining or in some other way as well as covered with other fabrics for various purposes or uses or be strengthened.

The coloring of the objects can already be in the milky juice in a known manner happen, you can also add the necessary fillers to the milk juice before coagulation to add.

It is not a requirement to start with completely fresh coagulum, because the same procedure can also be applied to coagulum, which is longer was kept. In general, the possible application will be the greater, the fresher the coagulum is.

Claims (2)

PATENT CLAIMS: i. Process for the preparation of rubber or for the production of articles made of rubber, characterized in that from preferably freshly coagulated raw rubber hollow bodies are formed, the Walls expanded with the help of a gaseous, liquid or solid pressure medium whereupon the rubber is vulcanized if necessary. 2. Rubber body according to claim i, characterized in that its walls are made of freshly coagulated Raw rubber are made with the help of a gaseous, liquid or solid pressure medium are extended.