Methods for reducing post-mold shrinkage of hollow oriented polyethylene terephthalate containers
US4482518A · kind A · utility
16Cited by
6References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1983 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Feb 9, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/909
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method is disclosed for reducing post-molding shrinkage of a hollow oriented polyethylene terephthalate container; the method including the steps of: PA1 (1) bringing a polyethylene terephthalate parison to orientation temperature, PA1 (2) blow molding the parison to provide a biaxially oriented container with larger dimensions than desired in the final container, PA1 (3) heating the blow molded container for a time and temperature sufficient to shrink the container to the desired size whereby substantially all the time-temperature dependent shrinkage is accomplished.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.