Apparatus for injection molding high-viscosity materials
US5387095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Apr 7, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/53
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for injection molding highly viscous materials in which incoming high-viscosity material flows through a supply conduit (24) and is divided into strands by splitter plates (58) as it flows into an evacuated chamber (52) and is degassed. When the chamber is full, the supply of high-viscosity material is interrupted and the chamber (52) is rotated to an injecting station while another chamber (54) swings to the degassing station for filling. At the injecting station, a piston (100) is lowered to engage the high-viscosity material in the first chamber (52), and a mold table is rotated to register a mold with a vacuum shroud (128') and the mold is lifted into the shroud. The piston (100) is further lowered in controlled increments to inject a quantity of high-viscosity material sufficient to fill a mold, then stop in place while the filled mold is removed and empty molds are sequentially inserted for filling. When the chamber has insufficient high-viscosity material remaining to fill another mold, the piston is retracted and the chamber (52) is rotated back to the degassing station while the filled chamber (54) swings to the injecting station for another cycle of loading addi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.