Injection molding method and injection molding apparatus
US7422426B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2006 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Mar 7, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/0032
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.