Flexible packing material in sheet or web form
US5223194A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Oct 15, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C59/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Flexible, creased material in sheet or web form for use in the manufacture of liquid-tight packing containers of good dimensional rigidity includes one or more base layers laminated to one another. The base layer is a mineral-filled thermoplastics material comprising between 50 and 80% calculated on the total weight of the mixture, of an inorganic, particulate mineral filler. The thermoplastic material is chosen among propylene-based polymers with a melt index of between 0.5 and 5 according to ASTM (2.16 kg, 230.degree. C.) and the base layer or base layers are provided with a pattern of crease lines which have been formed by plastic deformation in connection with or immediately after the extrusion of the base layer or base layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.