Plastic containers for storage of goods under pressure
US4387815A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1980 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Oct 14, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1397
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A form-retaining container made of synthetic plastic material and apparatus for its manufacture in which a plastic material is fed in liquid state onto a male member to provide a layer on the male member constituting a blank for the container. The layer is cooled to prevent crystallization of the material. The thus cooled blank is placed into a mold cavity having an interior configuration corresponding to the desired outer shape of the container to be produced. The layer is inflated into conformity with the mold cavity. The configuration of the mold cavity is such that the blank undergoes biaxial stretching in a middle region of the container by at least 1.5 times while the mouth and part of the bottom of the container will be formed by biaxially stretching the blank less than 1.5 times. The inflated blank is then heated until curing is completed and then the blank is removed from the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.