Sealable bags made of plastics or other materials and method of making plastic sheeting for manufacturing sealable bags
US7033077B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jun 3, 2003 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Mar 18, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2170/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A bag comprising first and second walls which are connected together along their sides and bottom and a flap portion which is connected to a top of one of the walls. The flap portion and this one wall together form a transversely extending Z-fold. An adhesive strip is provided for closing an open mouth of the bag and this strip extends in a transverse direction across an inner surface of said one wall. A protective band extends in a transverse direction across an inner section of the flap portion so as to cover and contact the adhesive strip. The flap portion also has a projecting outer section which can be pulled outwardly away from the interior of the bag to expose the adhesive strip. A method of making modified plastic sheeting suitable for making these sealable bags is also disclosed. Using one method, an aqueous coating of release material is applied as a band to a strip of plastic sheeting by means of a printing press. This band is then dried using a hot air dryer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.