Flexible collapsible containers, and method of molding
US4191231A · kind A · utility
27Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1977 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | Jul 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/24
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The method of molding flexible, collapsible containers comprises extruding a tubular parison of material to be molded and sealing the outer, free end of the parison; ballooning the parison with relatively low pneumatic pressure; closing the mold about the ballooned parison to cause the edges of the parison to protrude out of the mold chamber; and sealing said parison to form said container, including the step of forming seal lines positioned laterally inwardly from the lateral edges of the parison. A novel container design is also covered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.