Process for making a multi-layer film containing recycle polymer from cross-linked films
US5605660A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1995 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Apr 20, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the manufacture of a multilayer, cross-linked, heat shrinkable, polyolefin film, the film having at least one inner layer including a thermoplastic polymer sandwiched between two outer layers including a thermoplastic polymer different from the thermoplastic polymer of the inner layer, including the steps of coextruding the polymers into a tape; cross-linking the tape; and converting the cross-linked tape into a heat shrinkable film by orientation; wherein scrap material produced in the manufacture of the heat shrinkable film is incorporated by recycling the film into the coextrusion step in an amount up to 50% by weight of the total film weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.