Method of molding composite plastic sheet material to form a compression molded, deep-drawn article
US9364975B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2012 |
| Grant date | Jun 14, 2016 |
| Priority date | — |
| Expiry date | Jun 27, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/3008
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of molding composite plastic sheet material to form a compression molded, deep-drawn article is provided. The method includes placing a heated blank of moldable, composite plastic sheet material over a female die having an article-defining cavity defined by inner surfaces of the die so that the heated blank has a predetermined position and orientation over the cavity. Then an inner portion of the heated blank is forced into the cavity along a substantially vertical axis and against the inner surfaces of the die to obtain deep-drawn material. Outer peripheral portions of the heated blank adjacent the cavity are controllably held with corresponding predetermined holding forces based on the size and shape of the article to resist movement of the outer peripheral portions towards the cavity during the step of forcing wherein the deep-drawn material controllably stretches during the step of forcing without wrinkling, tearing or ripping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.