Method and device for the fabrication of plastic sleeves
US4718961A · kind A · utility
9Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1986 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Apr 30, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1168
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the fabrication of a plastic sleeve by heat sealing overlapped ends of a plastic film blank wrapped around a mandrel, a part of the underlying overlapped end is often melted inadvertently and adheres to the mandrel, obstructing easy stripping of the sleeve off the mandrel. Accordingly, a tensioning groove is formed in the mandrel surface, and a pressing-in bar is pressed thereinto over the sleeve while a part of the sleeve is held stationary against the mandrel by a holding plate to pull the sleeve part thus adhering sidewise in the peripheral direction of the mandrel and thereby to peel away and free the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.