Device for fabricating multiple plastic objects from thermoplast

Details Device for fabricating multiple plastic objects from thermoplast Device for fabricating multiple plastic objects from thermoplast

1996-06-11

1998-09-08

Ryan, Patrick

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264 403, 264572, 425149, 425546, B29C 4503

Patent

active

058042237

ABSTRACT:
The invention relates to a method for fabricating hollow plastic objects of thermoplastic material, having the following steps: a) injecting melt into the tool cavity (1, 2); b) Simultaneously and/or subsequently introducing a pressurized fluid into the melt, so that the melt which has been introduced into the molding tool (1, 2) is distributed in the cavity and is pressed against the walls of the molding tool (1, 2), the pressurized fluid being conducted from a pressurized container (5) into the melt, and the pressurized container (5) being supplied with fluid by a compressor (7) which contains a drive element (6); c) allowing the molded part (8) to cool; and d) relieving the cavity of the pressure of the pressurized fluid. According to the invention, the drive element (6) of the compressor (7) is maintained at a temporally constant power level (P) at least over the production of a large number of plastic objects. This power level is advantageously calculated from the ratio of the work (W) which must be done by the drive element (6) in order to furnish an amount of pressurized fluid that is needed for a certain number of plastic objects over an associated total cycle time (T), relative to this cycle time (T). As a result, the drive element (6) operates continuously, which results in favorable energy conditions and lower wear.

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"Sandwich Moulding--Competitor or Complement to Conventional Injection Moulding?--Specific Product Quality Demands New Production Processes--AirMould--MultiFoam," Injection Moulding Sets Course for the Nineties--Improved Quality--Reduced Costs Through New Processes and Flexible Solutions, Battenfeld, pp. 6/1--6/9, 6a-6g (Oct. 1987).

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