Plastic film bag assembly and process of filling
US6718738B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 2001 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Jul 9, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B67/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A plastic film bag assembly includes a bag having front and back walls joined together and defining an opening leading to a cavity. A header portion extends from the back wall for supporting the bag on a structure. A severance line extends across the header and includes tear sections extending inwardly from each of the header side edges. The severance line also includes support sections adjacent and inwardly of the tear sections. The support sections have a strength per unit length of severance line which is greater than the tear sections strength per unit length of severance line whereby, when severing the bag away from the header, a greater force is required for severing along the severance line support sections than the force required for severing along the tear sections. In use, the bag front wall lip is grasped and pulled away from the header for separating complementary profiles and opening the bag. The header tear sections are severed until reaching the support sections. The bag is retained open by continued pulling on the lip with a force insufficient for severing the support sections. Product is then placed in the bag and the lip is pulled with a sufficiently greater force…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.