CS261210B2 - Method of rubber high boots production - Google Patents

Abstract

A process for making rubber boots includes placing a felt lining over an expandable internal form and vulcanising the rubber parts of the boot over this lining by the application of heat to external mould parts as well as pressure applied within the internal form. The form may be of rubber and the external mould parts may be electrically heated.

Description

The invention relates to a method for producing rubber boots.

As is known, the various types of rubber boots used are characterized by their impermeability to water. They are therefore too cold when worn in winter. With constant or regular use, poor ventilation of the legs and sweating occurs, causing skin diseases, molds, etc.

There is also widespread use of felt boots, which are hot, but in turn permeable water. ·

As a result, there has been a need for a solution for a long time that provides perfect and safe foot protection in adverse working conditions, ie when working in damp, cold, etc.

A method of manufacturing high shin rubber footwear is known from the Czechoslovak patent specification No. 92,026, which however solves the process of easily removing the finished boot from the inner elastic mold by inserting a flexible metal pad in the foot part between the lining and the inner mold. The unvulcanised rubber compound is then loaded onto an integral, thin textile lining threaded on the inner mold, followed by vulcanization in a rigid outer mold that is heated. Even this method of producing boots does not address the above-mentioned shortcomings of this type of footwear.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing rubber boots which combines the advantages of rubber and felt boots while at the same time eliminating their disadvantages.

The above-mentioned deficiencies are eliminated and the object is solved by a method of producing rubber boots, in which a lining is first placed on the inner mold, which is expandable, and then the loaded rubber parts are vulcanized under the influence of heat and pressure medium supplied to the solid outer mold. The invention is based on the fact that the lining is made on the inner mold by making a non-stretchable, felt material.

In contrast to the prior art methods of producing rubber boots in which a textile lining has been applied to the inner mold and the rubber parts such as toe cap, heel, upper and shin have been glued to the inner mold and then vulcanized, the rubber parts are vulcanized according to the present invention. applying heat and internal pressure to the felt lining, the internal pressure first effecting the unvulcanized rubber into the thin structure of the felt material, followed by, or at the same time starting to cure the rubber under the effect of heat. This achieves perfect adhesion of the felt to the rubber and perfect water tightness.

By using the method according to the invention it is possible to produce such felt-lined rubber boots, the quality of which is substantially better than that of the known solutions. This means that heel and sole attachment are much more reliable. In addition, in this way, footwear can be produced relatively cheaply in any embodiment, which guarantees safe and thorough foot protection in wet and cold weather, in mud or the like.

Above the ankle, the rubber lining can also be omitted, so that the shin only has a felt protection, which further improves the ventilation of the foot.

The invention will now be described in more detail by way of example of a particular embodiment. The elastic expandable inner mold is made to fit the felt boot lining. The unvulcanised rubber panels are then loaded and the blank thus prepared is inserted with the flexible inner mold into a rigid outer mold with cavities corresponding to the outer shape of the shoe. The rigid outer mold is foldable and is provided with electrical heating with temperature control. The inner elastic mold may be made, for example, of rubber. Thereafter, the necessary pressing pressure is supplied to the expansion mold by means of a pressure medium. The pressure medium used is, for example, air at a pressure of 15 to 20x10 ⁵ Pa.

Claims (1)

Method for producing rubber boots, wherein a lining and vulcanizing rubber parts are vulcanized to the inner mold, which are vulcanized in a rigid outer mold under pressure and heat, characterized in that the lining is formed on the inner mold by making a non-stretchable felt material .