Multi-layer rotational plastic molding
US6982057B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2002 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | Oct 18, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1352
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A multi-layer rotational-molded plastic article has an area, such as a sight line for viewing content levels, where an inside layer protrudes through the outside layer and may be bonded to it. A first flowable material such as plastic resin is introduced into a mold having an insulating member extending through an aperture or slot into the mold. The mold is rotated and heated to less than full cure. The insulating member is removed, a second, transparent flowable material is introduced into the mold, and a cover member replaces the insulating member. The mold is rotated and heated to cure both resins, and only then cooled and opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.