Machine for press-molding thermoplastic resin
US4925381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | May 10, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/001
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plasticized resin is extruded from an extruding machine into an accumulator into which the resin is stored by an amount exceeding the amount required for one resin molding operation. The stored resin, in operation, is fed through a flexible hose towards a gear pump under controlled pressure conditions. The resin is measured by the gear pump and the displacement and the rotational speed of the gear pump are controlled by a suitable controller such as microcomputer to exactly measure the plasticized resin to be charged into the mold cavity in a predetermined distributing mode. The clamping of the mold can be effected by a clamping force less than that required by a conventional press-molding machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.