Process for producing hollow bodies of thermoplastic material

Details Process for producing hollow bodies of thermoplastic material Process for producing hollow bodies of thermoplastic material

1988-02-10

1989-10-17

Anderson, Philip

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

264 461, 264 464, 264321, 264515, 264524, 264DIG1, 425523, 425532, 425817R, B32B 520, B29C 6722, B29C 4922, B29C 4904

Patent

active

048746495

ABSTRACT:
In a process for producing a hollow body with a wall which partially comprises foamed thermoplastic material by an extrusion blow molding procedure, a preform which comprises at least first and second layers of which at least one comprises foamable plastics material is first extruded, the layer of foamable material is foamed, and then the preform is expanded in a blow molding mold by the application of an internal pressure. The hollow body may have a welded seam at a region of the hollow body at which an operation of squeezing off excess material has been carried out, the seam being in the form of an outwardly projecting flange web portion and the thickness thereof being such that the layer of foamable material is compressed at least to such an extent that it is not thicker than in the unfoamed condition.

REFERENCES:
patent: 3168207 (1965-02-01), Noland et al.
patent: 3225127 (1965-12-01), Scott, Jr.
patent: 3901958 (1975-08-01), Doll
patent: 4115491 (1978-09-01), Hanning
patent: 4120924 (1978-10-01), Rainville
patent: 4150080 (1979-04-01), Hagen
patent: 4233009 (1980-11-01), Hagen

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