Injection molding method and injection molding apparatus
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United States of America Patent
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Mar 4, 2008
Grant Date -
Jan 20, 2005
app pub date -
Aug 4, 2003
filing date -
May 31, 2001
priority date (Note) -
Expired
status (Latency Note)
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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).
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