Fluid cooled hydraulic actuating mechanism for injection molding
US4747770A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Nov 4, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/281
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a multi-cavity valve gated injection molding system wherein a continuous flow of hydraulic fluid through the actuating mechanism provides additional cooling. A pair of hydraulic fluid lines are drilled in the mold back plate to apply a minimum pressure differential across the cylinder chamber on one side of the piston. In the preferred embodiment, this pressure differential is also applied to opposite sides of a circular cooling chamber extending through the cylinder to provide additional cooling near a high pressure seal. Additional cooling is very advantageous to avoid system malfunctions and inferior product, particularly when molding high performance engineering resins at a high temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.