SU412007A1 - - Google Patents

Description

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The invention relates to the field of processing granulated thermoplastic materials into products and may find application in the manufacture of, for example, diffusers for lamps and similar products.

There are known methods for producing products from granulated thermoplastic polymeric materials by filling the cavity formed by concentrically arranged half-molds, thermoplastic granules, melting and joining them by heating to an internal half-form and subsequent cooling.

However, it takes considerable time to melt and join the granules during heating of the inner half-form due to the low thermal conductivity of the thermoplastic.

With a large thickness of the product outside, its surface is not of sufficient quality or the heating process must be carried out repeatedly.

The proposed method provides simultaneously with heating the inner half-mold to carry out heating of the outer half-mold to the temperature of the highly elastic state of the thermoplastic, and cooling to produce compressed air.

This will shorten the manufacturing time and improve the quality of the products.

The method consists in that the cavity formed by concentrically located half-molds fills the grains of the thermal | formation layer and simultaneously heats the internal half-form to the temperature in the flowing state of the thermoplastic granules and the external one to the temperature of the highly elastic state of the thermoplastic granules, resulting in. there is a melting of the granules at the surface of the inner half-form, which ensures the formation of a dense selected structure of the product, creating a rigid frame of the product and the melting of the granules at the surface These outer half-forms, while they acquire a crystal-like form. Then they are cooled with compressed air, as a result of which the granules are fixed by rapid cooling - the product is ready.

By autonomously controlling the heating temperature of the inner and outer half-molds, the time to manufacture the product is minimal, regardless of the wall thickness of the product.

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Subject invention

A method of manufacturing products from granulated thermoplastic polymeric materials. By filling a cavity formed by concentrically located half-molds, thermoplastic granules, melting and joining them by heating to the temperature of the flowing thermoplastic inside the half-form and subsequent cooling, 5 characterized in that reduction of production time 4 and improvement of product quality, simultaneously with heating the inner half-form, heating the outer mold to a high temperature oelastichnogo thermoplastic state and cooling the compressed air is produced m.