Method of rotationally molding plastic articles
US4185067A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1974 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Sep 25, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C41/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of rotationally molding blends of polymers of good flow to produce articles of high impact resistance, high stress crack resistance, smooth surfaces, and the absence of excessive warpage in which the blend is placed in a rotational mold which is then biaxially rotated about two perpendicular axes while heating the mold and contents and then cooling the mold and contents to about room temperature while maintaining this biaxial rotation followed by removing the resulting article. The disclosure also includes the rotationally molded shaped structures resulting from this method with these structures having high impact resistance, high stress crack resistance, smooth surfaces and the absence of excessive warpage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.