Extrusion blow molding of multilayer hollow bodies with layer di

Details Extrusion blow molding of multilayer hollow bodies with layer di Extrusion blow molding of multilayer hollow bodies with layer di

1991-03-15

1992-08-25

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

425132, 4251331, 425523, B29C 4904, B29C 4922, B29C 4978

Patent

active

051416980

ABSTRACT:
In a process and apparatus for the production of hollow bodies from thermoplastic material, having a wall of a laminate formed by at least first and second layers, by means of extrusion blow molding, a preform having a wall structure with a suitable number of layers is first produced in a batch-wise procedure using an extrusion head. The material required to produce the preform is guided in the extrusion head in such a way that disturbed portions of the laminate pass into the waste flash portions at the ends of the hollow body produced from the preform, so that the wall of the finished hollow body is devoid of disturbed laminate portions of that kind.

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