Blow molding process for the manufacture of polyethylene terephthalate containers
US5229042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Feb 13, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/906
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the manufacture of a polyethylene terephthalate (PET) container capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. The process inlcudes the following steps, on an amorphous PET preform which includes a body and a neck section which already possesses the final shape and dimensions of the PET container to be formed, heating only the body, exclusive of the neck section, of the PET preform to a temperature at least equal to the PET-softening temperature; in a mold, blow molding the heated preform body to form an intermediate container whose body has dimensions greater, by about 20% with respect to height and by 0 to about 30% transversely, than the dimensions of the PET container to be formed, while cooling the mold walls holding the intermediate container to a temperature of about 5.degree. to about 40.degree. C.; heating the body of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. for a period of about 1 to about 5 minutes to obtain an intermediate container with contracted body…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.