Injection molding method and injection molding apparatus

Details Injection molding method and injection molding apparatus Injection molding method and injection molding apparatus

2006-02-14

2008-09-09

Gupta, Yogendra (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With coupling between charger and mold

C425S574000, C264S328800

Reexamination Certificate

active

07422426

ABSTRACT:
The present invention provides an injection molding method which intends to lower a mold clamping force in view of both of a projected area of a molded article and an injection pressure, and contributes to an energy saving and a reduction in a cost of equipment and a manufacturing cost. In a cavity (13) formed in a metal mold (5) for an injection molding, there are arranged a first gate (21) injecting a first molten resin (101) anteceding in one end side (a charging start side) in a longitudinal direction, and a second gate (22) injecting a second molten resin (102) following in another end side (a charging finish side). The second molten resin (102) is newly injected from the second gate (22) before a fluid head portion of the first molten resin (101) injected from the first gate (21) reaches a position of the second gate (22). Further, the first molten resin (101) becomes in an approximately cooled and solidified state by the time when the second molten resin (102) reaches a terminal end in the charging finish side within the cavity (13).

REFERENCES:
patent: 3464091 (1969-09-01), Bielfeldt
patent: 3671159 (1972-06-01), Greenberg et al.
patent: 3981662 (1976-09-01), Bielfeldt et al.
patent: 5407342 (1995-04-01), Boucher et al.

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