Winding core for heat shrinkable film material
US4114756A · kind A · utility
5Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1976 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Dec 13, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2976
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A generally cylindrical core for winding a web of sheetlike material has portions with a lesser diameter than other portions such that otherwise baggy areas of the web overlie the lesser diameter area of the core. The core particularly solves the problem of elongated edges on a wound film of heat shrinkable thermoplastic material caused by differential shrinkage about a core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.