Method and apparatus for measuring and controlling thermoplastic foam sheet blow-up
US4832885A · kind A · utility
15Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 9, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Mar 9, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C51/46
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for controlling foam sheet blow-up in a thermoformer oven. Control of the oven operation is achieved through monitoring the measured blow-up of a material which being heated in the thermoformer oven in a forming station or thermoformer, such as by a linear variable differential transformer, in order to adjust the thickness of the plastic material by regulating the temperature of the oven prior to the conveyance of the material into the molding or forming station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.