Hot pin parison injection molding technique
US4054630A · kind A · utility
11Cited by
13References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1976 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Jan 22, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Parisons for use in making blow molded highly molecularly oriented plastic bottles are injection molded using a cooled cavity and a relatively hot core pin to prevent the formation of residual internal stress in or near the surface of the parison. The pin is maintained at a temperature above the glass transition temperature of the resin to reduce the formation of cracks when the parison is subsequently blow molded in the orientation temperature range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.