Method and apparatus for injection molding hollow shaped article
US5173241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1990 |
| Grant date | Dec 22, 1992 |
| Priority date | — |
| Expiry date | May 24, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1732
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the injection molding of a hollow shaped article by the injection of not only molten synthetic resin but also compressed gas into a die, a method is provided by this invention which effects the supply of the compressed gas with a multistage compressor and the injected compressed gas is recovered in a recovery container connected to the suction side of the multistage compressor. For the injection molding of a hollow shaped article by the injection of not only molten synthetic resin but also compressed gas into a die, an apparatus is provided by this invention which has a gas nozzle for injecting the compressed gas into the die connected through a first switching valve to the discharge side of the multistage compressor and, at the same time, has the gas nozzle connected through a second switching valve to a recovery container connected to the suction side of the multistage compressor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.