Method for preventing occurrence of impact pressure in injection molding machine
US6183682A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Dec 31, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2945/76083
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Gas (air) is supplied into an oil transfer line extending between a front oil chamber of an injection cylinder and an oil tank during a molding cycle, excluding an injection step, thereby preventing impact which would otherwise occur due to oil pressure generated upon start of injection in the injection step. Thus, immediately before the start of the injection step, the oil transfer line becomes empty of or almost empty of oil. Accordingly, even when high-pressure oil is supplied into the injection cylinder in an impactive manner upon start of injection, pressure oil ejected from the injection cylinder flows swiftly through the oil transfer line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.