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

1992-09-01

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

051436817

ABSTRACT:
In a process and apparatus for the discontinuous production of preforms for producing hollow bodies from thermoplastic material, the wall of which is a laminate having at least first and second layers, by extrusion blow molding, the flow of material for forming the laminate is guided within the extrusion head which serves to produce the preforms, by suitable dimensioning of the volume of the duct system accommodating the laminate, such that regions of disturbed laminate occur in the end portions of the preform which are squeezed off the extruded preform by the blow molding mold as a waste portion.

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