Process for making biaxially stretched, heat shrinkable VLDPE films
US5256351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1991 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Oct 21, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B27/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of manufacturing heat-shrinkable, puncture resistant, biaxially stretched thermoplastic films from very low density polyethylene (VLDPE). The film may be entirely VLDPE or it may be multilayer with an oxygen barrier core layer formed of material such as a polyvinylidene chloride copolymer or an ethylene vinyl alcohol copolymer, and two outer layers. One of these outer layers may for example be a blend of ethylene vinyl acetate (EVA) and VLDPE, and the other outer layer may be EVA. The film may be fabricated into bags suitable for packaging food articles such as frozen poultry, primal meat cuts, and processed meat products. The bags have high shrink and improved toughness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.