Apparatus for producing a body of porous thermoplastic material

Details Apparatus for producing a body of porous thermoplastic material Apparatus for producing a body of porous thermoplastic material

1975-11-20

1978-01-10

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

222488, 222564, 264DIG12, 425371, 425817C, B29D 2704

Patent

active

040676722

ABSTRACT:
The invention relates to an apparatus for continuous production of a strand of porous thermoplastic material from preferably pre-expanded granules of said material containing an expanding agent. The apparatus comprises an elongated rectangular channel, two opposite sides of which are formed by the horizontal parts facing one another of two superimposed endless belts moving in a closed path between turning rollers. The granules are introduced through the open intake end of said channel and are expanded to final size and sintered together to a porous coherent strand by means of steam fed between the horizontal belt parts facing one another. The steam and the granules are fed into the channel through individual ducts which are separated from one another and connected to the intake end portion of the channel. Usually, a plurality of granule feeding ducts and a plurality of steam supplying ducts are attached to the intake end portion formed as a box of particular shape. Some specific grouping of the ducts connected to said box has proved to render excellent results in uniform distribution of the granules and even heating to sintering temperature.

REFERENCES:
patent: 3142864 (1964-08-01), Pelley
patent: 3178768 (1965-04-01), Edberg
patent: 3626486 (1971-12-01), Bugbee et al.
patent: 3832099 (1974-08-01), Berg
patent: 3917439 (1975-11-01), Yovanovich

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