An extrusion and blow molding process for plastic objects,...

Details An extrusion and blow molding process for plastic objects,... An extrusion and blow molding process for plastic objects,...

B - Operations, Transporting

29

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18/533

B29C 49/30 (2006.01) B29C 47/50 (2006.01) B29C 47/92 (2006.01) B29C 49/04 (2006.01) B29C 49/64 (2006.01)

Patent

CA 2012103

An EXTRUSION and BLOW MOLDING PROCESS for PLASTIC OBJECTS, UTILIZING LOW VISCOSITY MATERIALS ABSTRACT of the DISCLOSURE In a process featuring the discontinuous extrusion of a parison with or without the assistance of an accumulation chamber and accomplished in a time shorter than that required to complete the molding cycle, valves are used to check the flow of molten material and thus generate pressure internally of the extruding head; when the valves are opened to release the material for extrusion, the sharp drop in pressure occurring on its emergence from the extruder orifice induces a partial cooling, the effect being to hold the mechanical properties of the parison stable until safely taken up between the halves of a mold, internally of which it is inflated and invested with the shape of a bottle, container, etc. fig

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