Bag having intermittent orientation draw tape and method of making
US4628536A · kind A · utility
28Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Apr 11, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S383/908
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Draw tape bags have a high molecular weight, high density polyethylene draw tape which is intermittently stretched so that the tape has central portions of relatively narrow and thin oriented polyethylene and end portions which are relatively wide and thick. The end portions are heat sealed to the sides of the bag panels to secure them. The stretching makes the tape cost more economical and improves the break characteristics while the thick and wide end portions permit good heat sealing without weakening the draw tape. Also disclosed is a method of making such bags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.