B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/656
B29D 27/00 (1980.01)
Patent
CA 1055670
ABSTRACT OF THE DISCLOSURE 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. In a heating zone of this channel the granules are expanded to final size and sintered together to a porous coherent strand which is cooled in a following cooling zone of the channel. In order to have the granules supplied into the channel so as to have them distributed uniformly over the cross-sectional area of the channel and prevent them from clogging together and/or adhering to the conduit walls of the apparatus, an outwards extending box having the same cross-sectional feeding area as the cross-sectional area of the channel, is provided ahead of and connected to the inlet opening of the channel. The height of the box is adjustable together with that of the channel by a single lifting or lowering operation of the turning rollers of the upper belt. The granules are introduced into the box by ejectors operated with a non-condensable gaseous medium preferably air at approximately room temperature. According to a preferred embodiment the box is made in two parts a stationary one and a vertically movable one the adjusting of which to a desired height level coinciding with a desired height of the channel and therewith the thickness of the produced strand is effected by the adjusting operation of the turning rollers of the upper belt.
191593
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