Dual feed bushing for multi-cavity injection molding
US4705473A · kind A · utility
40Cited by
7References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1986 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Nov 5, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2889
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to an improved valve pin bushing for a multi-cavity, injection molding system. The valve pin bushing has a central bore through which the valve pin extends. The melt duct extends through the bushing to join an enlarged portion of the central bore around the valve pin. In the bushing according to the invention, the melt duct branches into two arms with smoothly curved bends which lead to opposite sides of the valve pin. This avoids the problem of streaking and slow melt flow on the opposite side of the valve pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.