B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1164
B29C 33/00 (2006.01) B29C 31/04 (2006.01) B29C 33/06 (2006.01) B29C 43/34 (2006.01) B29C 43/36 (2006.01) B29C 43/42 (2006.01) B29D 23/20 (2006.01)
Patent
CA 1317733
ABSTRACT The invention relates to a process for the manufacture of molded articles made from thermoplastic molding compound, by heating of the latter, molding of a blank by means of an annular, if need be, die; sepa- ration of the blank by using a heated stream of gas, such stream of gas surrounding the die and being directed at the point of separation; introduction of the blank in a compression-molding mold; closing of the mold; shaping of the compressed article by appli- cation of a compression pressure; and cooling of the molded article at least partly under pressure. According to the invention, the total amount of heated thermoplastic molding compound needed for a blank is deposited on the surface of an intermediate support, such surface forming part of the mold, and such inter- mediate support being extended under the die, and separated from the die, whereby the intermediate sup- port is lowered as the mold is being closed. The invention, furthermore, relates to a device for carry- ing out the process of the invention, with an extruder for heating thermoplastic molding compound, and with a closable die (1) suitable for dispensing portions of the molding compound, such die being annular, if need be, and surrounded by and annular nozzle (4), if nec- essary, for feeding a stream of gas against the point at which the portions of molding compound are sepa- rated from the die (1), which stream of gas may be heated; and with at least one closable mold consisting of a molding matrix (5) and a molding mandrel (13), such molding matrix (5) being arranged under the die (1), on the one hand, and coaxially with the molding mandrel (13), on the other hand; and whereby a com- pressing pressure is applicable to and maintainable on the molding mandrel (13) and/or molding matrix (5). According to the invention, an extendible intermediate support (8) is arranged in the molding matrix (5), the free surface (11) of such support, in the retracted position of the latter, forming part of the shaping surface of the matrix (5) reproducing the molded article. (Fig. 1).
590751
Iseli Andreas
Keller Gerhard
Aisa Automation Industrielle Sa
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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