Radiation stress relieving of polymer articles
US4424095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1982 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | May 21, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24322
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of rapidly relieving stress in an extruded or molded polymer article is disclosed. The method can be used in the preparation of printed circuit boards. An article comprised of the polymer is exposed to electromagnetic radiation, for a time period sufficient to absorb enough energy to stress relieve the polymer against stress cracking therein. Exposure occurs at one or more ranges of frequencies which are capable of being absorbed by the polymer and which are effective for stress relieving without or substantially without causing heat induced softening or flowing of the polymer. The electromagnetic radiation is selected from the ranges of infrared, microwave or ultraviolet radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.