Method for making a packing laminate
US4062712A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Oct 5, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249993
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A packing laminate for use in the manufacture of disposable packages consists of a relatively thin central layer made from high-density polyethylene, two intermediate foam layers of polystyrene applied respectively to opposite faces of the central layer by means of a thermoplastic glue and two outer layers of a compact high-impact polystyrene applied respectively to the intermediate layers. The laminate is manufactured by joint extrusion of a flexible tube consisting of an inner layer of the foamed polystyrene and an outer layer of the compact high-impact polystyrene, this tube being thereafter split longitudinally into two halves to form two webs which are then joined respectively to opposite sides of the central layer of high density polyethylene following its extrusion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.