MASCHINE ZUR HERSTELLUNG EINES SCHAUMSTOFFKOERPERS AUS THERMOPLASTISCHEM KUNSTSTOFF

摘要

A machine for continuous production of a strand of porous thermoplastic material from expandable, pre-expanded granules of said material by additional expansion and agglutination in a channel open at both ends and defined between opposed horizontal portions of two endless belts movable along closed paths under the action of heat from separate heating boxes adjacent said belt portions. To vary the height of the channel and therewith that of the strand advanced therethrough, the spacing between the opposed defining belt portions is variable. For rendering possible any desired variation of said spacing with as short break of operation as possible, the heating boxes project outside the belt portions and are here sealed from one another and from the sides of the channel between the belt portions by primary beams ridigly secured to the heating boxes and secondary beams exchangeably interposed between the primary beams. The secondary beams have varying height dimensions preferably according to a predetermined module permitting to assemble them to any desired height of the channel. The assembled beams form an interior face in the same vertical plane and their interior surfaces are preferably covered with a layer of friction reducing material.