B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/514
B29C 49/22 (2006.01) B29C 67/20 (2006.01)
Patent
CA 1287957
ABSTRACT OF THE DISCLOSURE 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 protecting 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.
560889
Daubenbuchel Werner
Jira Alfred
Fetherstonhaugh & Co.
Krupp Kautex Maschinenbau Gmbh
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