Manufacture of plastic bags having drawstrings
US4547237A · kind A · utility
9Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1979 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Sep 7, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24025
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A drawstring is mounted near the open mouth of a plastic bag by a pressure sensitive tape that freely laterally encloses the drawstring except for projecting free ends, the tape being formed or treated so as to be non-sticky with respect to the drawstring. A high speed production method of making the bags comprises the steps of laying a continuous length of drawstring material across a series of spaced bags, applying strips of pressure sensitive tape to each bag to freely laterally enclose the drawstring length there and severing the drawstring length between bags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.