Injection molding process and apparatus
US4077760A · kind A · utility
16Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1976 |
| Grant date | Mar 7, 1978 |
| Priority date | — |
| Expiry date | Oct 21, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/2708
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There is disclosed a gating assembly provided with at least two orifices of different diameters and associated with an injection molding assembly. In an initial stage of extruding the plastic material into a mold cavity, the orifice of larger diameter is utilized to provide the fluid communication between the extruder nozzle and mold cavity whereas the orifice of smaller diameter is utilized in the final stages of injection to insure thorough packing of the plastic material in the injection mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.