Injection molded articles with improved surface characteristics
US4439492A · kind A · utility
24Cited by
10References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Mar 29, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In injection molding thermoplastic resin compositions containing reinforcing materials and/or fillers, high quality molded articles superior in surface gloss and exhibiting substantially no surface defect can be obtained, by employing a technical measure, in which only superficial layer of the inner wall surface of the mold is selectively heated, by high-frequency induction heating, to a temperature above the heat distortion temperature of the thermoplastic resin composition employed prior to injection molding and cooling and solidifying the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.