Method and apparatus for making draw strip bags
US11518134B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2016 |
| Grant date | Dec 6, 2022 |
| Priority date | — |
| Expiry date | Jan 26, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2170/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Continuous method for making a web of draw strip bags, comprising providing a film web (F) wherein a first portion (11) and a second portion (12) overlap each other with free longitudinal side edges (7, 7′) thereof being essentially aligned with each other, back folding a first part (13) having said free side edge (7) of the first portion (11) outwardly away from said second portion (12) along a first fold line (B) by a first hemmer (120), and by folding a first subpart (15) of said first part (13) along a second fold line (C) whereby the free side edge (7) of the first portion (11) is brought into near alignment with said first fold line (B) while a second subpart (14) of said first part (13) of the first portion (11) remains back folded, whereby said first and second subparts (14, 15) of the first portion define a first hem (H1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.