Process for thermoforming hollow articles
US4034054A · kind A · utility
22Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1974 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Sep 20, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C51/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There is disclosed a novel process for using a pressure box assembly associated with a thermoplastic thermoforming assembly. The pressure box assembly is provided with a diaphram formed of a resilient material, such as synthetic rubber and the like, disposed across the entrance into a cavity of the pressure box of the pressure box assembly. The pressure box assembly is associated with thermoforming molding apparatus to cause a heat thermoplastic sheet or web to be drawn about a male mold provided on a male mold assembly during insertion of the male mold into the cavity in a hollow article of more uniform wall thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.