Winding core for heat shrinkable film material
US4242297A · kind A · utility
5Cited by
15References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | Dec 31, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H75/00
- 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.