US 5,534,218 AGranted

Process for the production of a hollow body of thermoplastic material

AssigneeKrupp Kautex Maschinenbau GmbH

InventorsWerner Daubenbuchel, Alfred Jira

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Abstract

In a process for the production of a hollow body of thermoplastic material which is to include an additional portion, by expansion of a preform in a blow molding mold, the additional portion is connected to the hollow body upon expansion of the preform to form the hollow body. To form the connection between the hollow body and the additional portion, the latter is heated by a heating element which is brought into contact with at least the surface of the additional portion that is to involve the welded connection to the hollow body, prior to expansion of the preform. The heating element is brought into contact with the additional portion when already disposed in the blow molding mold in order in that way to heat at least the appropriate surface of the additional portion to a temperature which premotes the production of an adhesive join to the hollow body. The region of the additional portion that is to be heated is at least substantially covered relative to the outside atmosphere by the heating element.

Claims17

Dependent claims

In a process for the production of a hollow body of thermoplastic material, which includes at least one additional portion, comprising the steps of:

introducing a preform into an open divided blow molding mold which is provided at its inside wall with a seat into which the additional portion is fitted and seated;
closing the divided mold;
expanding the preform in the closed mold to provide the hollow body;
and pressing a region of the wall of the preform in the course of the expansion operation in a still hot-plastic state against the additional portion to form an adhering connection between the additional portion and the hollow body, the improvement comprising prior to completing the step of expanding the preform, the steps of heating at least a part of a surface of the additional portion with a heating element while the additional portion is in the mold, said part of the surface to be connected to the hollow body produced by expansion of the preform, by the transmission of heat from the heating element to the part of the surface of the additional portion to raise the part of the surface to a temperature effective to form the adhering connection between the additional portion and the hollow body, while simultaneously effectively covering the part of the surface from exposure to the outside atmosphere in the open mold with the heating element.

1 more element

In a process for the production of a hollow body of thermoplastic material, which includes at least one additional portion, comprising the steps of:

introducing a preform into an open divided blow molding mold which is provided at its inside wall with a seat into which the additional portion is fitted and seated;
closing the divided mold;
expanding the preform in the closed mold to provide the hollow body;
and pressing a region of the wall of the preform in the course of the expansion operation in a still hot-plastic state against the additional portion to form an adhering connection between the additional portion and the hollow body, the improvement comprising prior to completing the step of expanding the preform, the steps of heating at least a part of a surface of the additional portion seated in the mold with a heating element, said part of the surface to be connected to the hollow body produced by expansion of the preform, by the transmission of heat from the heating element to the part of the surface of the additional portion to raise the part of the surface to a temperature effective to form the adhering connection between the additional portion and the hollow body, while simultaneously effectively covering the part of the surface being heated from exposure to the outside atmosphere in the open mold with the heating element.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 08/141,916Filed 22 Oct 1993
Priority: DE 42 36 439.628 Oct 1992
Granted: 9 Jul 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B29C 49/2408
Lining or labelling: in-mould lining or labelling
B29C 31/008
Handling, e.g. feeding of the material to be shaped , storage of plastics material before moulding; Automation, i.e. automated handling lines in…:…
B29C 49/04102
Extrusion blow-moulding: extruding the material continuously
B29C 49/20
Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor: of articles having inserts or…