Method of treating hollow articles, in particular polyethylene terephthalate preforms
US4764323A · kind A · utility
30Cited by
1References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1986 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Nov 12, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of treating PET preforms and bottles consists of subjecting the preforms or the bottles to a carbon dioxide atmosphere at a higher temperature than the critical temperature of carbon dioxide, a higher pressure than ambient pressure, and for a set time period. The treatment reduces the acetaldehyde concentration in the head of the treated bottles or in the bottles obtained from the treated preforms by stretch-blowing, and also reduces the permeability of gases through the bottle walls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.