Process for producing ferrules by injection molding polymers while rotating a mold part
US5804125A · kind A · utility
6Cited by
10References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 10, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | May 10, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0079
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Flow lines are eliminated from workpieces injection-molded from liquid crystal polymers, fiber-filled or mineral-filled thermoplastics by selecting a liquified polymer having a linear coefficient of thermal expansion less than (2-6).times.10.sup.-6 /.degree.K, providing a flow path in a mold for the polymer in two directions around a core in the mold, and subjecting the polymer to a shearing energy only simultaneously with mold filling over at least part of the flow path, whereby molecules of the polymer are disoriented and fail to produce a rigid alignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.