Method for thermoforming
US7033536B2 · kind B2 · utility
4Cited by
8References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2003 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Jan 21, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7132
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for thermoforming deep drawn parts such as cups in which a vacuum is momentarily applied to a preheated sheet material when overlying a clamping plate prior to clamping and advance of the plug assists to delay contact with a lip molding feature projecting from each mold cavity. This avoids a molding defect due to premature cooling of a localized region of the sheet material when the sheet material comes into contact with the lip molding features.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.