Injection molding with periodic forces to the material in the mo

Details Injection molding with periodic forces to the material in the mo Injection molding with periodic forces to the material in the mo

1996-04-10

1998-12-22

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to heat the...

Induction heating

264 69, 2643288, 26432812, 26432816, B29C 4500, B29C 4573

Patent

active

058514740

ABSTRACT:
An injection moulding process for moulding a material in a mould having a mould cavity and at least one channel communicating with the mould cavity, each channel entering the mould at a respective mould inlet includes the steps of heating inner surface areas of the mould to a temperature above the heat distortion temperature of the material; supplying the molten material into the mould by way of at least one channel and subjecting the molten material to a propelling force, sufficient to propel it through the channel into the mould; causing the molten material in the mould to solidify; applying periodic forces to the material in the mould at a plurality of spaced-apart regions, first and second of the regions being located either side of molten material in the mould cavity, the periodic force being applied with a difference in phase so as to cause shear of molten material within the mould cavity between the first and second regions; cooling the mould below the heat distortion temperature of the resin while or after applying the periodic force; and then opening the mould, and removing the moulded article.

REFERENCES:
patent: 4340551 (1982-07-01), Wada et al.
patent: 4469649 (1984-09-01), Ibar
patent: 4925161 (1990-05-01), Allan et al.
patent: 5254298 (1993-10-01), Ibar
patent: 5472335 (1995-12-01), Morikita
patent: 5494426 (1996-02-01), Ibar
patent: 5538413 (1996-07-01), Gardner et al.
patent: 5543092 (1996-08-01), Ibar

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