Continuous plastics molding process and apparatus

Details Continuous plastics molding process and apparatus Continuous plastics molding process and apparatus

B - Operations, Transporting

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B29C 59/04 (2006.01) B29C 33/36 (2006.01) B29C 35/16 (2006.01) B29C 43/22 (2006.01) B29C 43/48 (2006.01) B29C 43/52 (2006.01) B29C 47/12 (2006.01) B29C 69/02 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2034359

A continuous process and apparatus for forming products from thermoplastic materials between top and bottom mold carriages is disclosed. Each carriage has a frame including a backup plate coated with a low coefficient of friction material over which slides a continuously moving belt mold. The belt mold is comprised of a flexible silicone rubber mold adhered to a fiber belt. The silicone rubber mold has a surface of desired shape for mating with an opposed mold surface to form a continuously moving mold channel into which is fed thermoplastic material at a moldable temperature. After molding the hot plastic material, localized surface heat of the belt molds is removed by cold air blown against the belt mold. The low coefficient of friction backup plates have numerous air-bearing holes for feeding high pressure air between the low coefficient of friction plates and the moving fiber belt to reduce friction and reduce wear. The fiber belts are guided and driven by a wide V-shaped central ridge or by twin-wide V-shaped ridges near their edges. The V- shaped ridges fit into and mesh with corresponding geared teeth in grooves of the sprocket drive rolls and operate to maintain alignment of the mold belts. An electric drive motor, with or without the assistance of a torque motor, drives both belt molds in unison to maintain their relative alignment. Electric screw jacks raise the top carriage, extend and retract the grooved exit rolls, and fine tune the alignment of the moving belt molds by adjusting the grooved exit rolls and move the machine to and from the extruder.

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