Metal mold structure for molding multi-layer resin
US4840553A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Sep 20, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2101/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a metal mold for a multi-layer resin molded article for effecting, in injection-molding a cylindrically-shaped part, sandwich molding in which core layer resin is used for the center of the cylinder portion of the cylindrically-shaped part and skin layer resin is used for the portion around the center of the cylinder portion, a mold member provided with a cavity for molding the cylindrically-shaped part has attached thereto a runner plate provided with a plurality of runners for passing the resins therethrough into the cavity, the runner plate has attached thereto a fixed plate provided with a sprue connected to an injection cylinder unit for the core layer resin and an injection cylinder unit for the skin layer resin, the start point of the plurality of runners and the injection port of the injection cylinder unit for the core layer resin are arranged on a straight line, and a runner for the skin layer resin is provided between the injection cylinder unit for the skin layer resin and the start point of the runners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.