Method for cooling injection molding molds
US5591385A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1994 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Dec 21, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/7337
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention provides a plastic molding method, a mold, and a molded article. According to this invention, the supply flow rate of a coolant, e.g., cooling water, to a mold is maintained to shorten the molding cycle and to improve the productivity in continuous molding. The temperature distribution and pressure distribution in the mold are measured, thereby realizing determination as to whether a molded article is defective or not in the molding and cooling processes. The temperatures at respective required portions of the molded article removed from the mold are monitored, so that determination as to whether a molded article is defective or not can be performed, thereby improving the productivity. Countermeasures are taken not to deform the molded article. A thermoplastic resin injected from a hot runner into a cavity is heated at a gate discharge portion by a shearing heat upon injection. Countermeasures are taken to suppress temperature increase caused by this heat. Thus, the contiguous portion between the hot runner and the cavity is formed such that a recess will not be formed in the completed molded article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.