Method of controlling extrusion of multilayer parison

Details Method of controlling extrusion of multilayer parison Method of controlling extrusion of multilayer parison

1992-03-24

1993-10-12

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling rate of movement of molding material or its...

264 401, 264 405, 264515, 264173, 4251331, 425145, 425146, 425149, 425170, B29C 4792

Patent

active

052522687

ABSTRACT:
A method of controlling the extrusion of a multilayer parison so that the injection pressure for an auxiliary resin and that for an adhesive do not act on the annular fluid passages while a main resin, an auxiliary resin and an adhesive are stored in a main resin accumulator, an auxiliary resin accumulator and adhesive accumulators, respectively. The injecting pressure difference between each pair of auxiliary resins and the adhesive is maintained within a prescribed range and the injection of the resins and the adhesive from the accumulators is terminated simultaneously for all the materials.

REFERENCES:
patent: 4717326 (1988-01-01), Motonaga et al.
patent: 4867664 (1989-09-01), Fukuhara
patent: 4978290 (1990-12-01), Fukuhara
patent: 5004578 (1991-04-01), Eiselen
patent: 5071604 (1991-12-01), Tsujikura et al.
patent: 5098274 (1992-03-01), Kristnakumar et al.
patent: 5110519 (1992-05-01), Daubenbuchel et al.

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