Packaging method and apparatus
US4014154A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1975 |
| Grant date | Mar 29, 1977 |
| Priority date | — |
| Expiry date | Apr 23, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7128
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A packaging system wherein a web of interconnected heat-sealable bags are successively fed to a loading station where the bags are opened by an improved air flow system and loaded. An improved sealing and detaching assembly grips a loaded bag and isolates a region of the bag where a heat seal is to be formed from external forces thereby (1) permitting the formation of a heat seal in bag portions which are relaxed and, therefore, not subject to tearing or distorting, and (2) permitting the assembly to pivot relative to the web to tear off a loaded bag at the same time a heat seal is being formed on the bag. The assembly includes an improved resilient closure bar which, during a forward stroke of travel (1) engages one face of a loaded bag, (2) closes the bag, (3) clamps the opposite bag face against a pair of spaced gripper bars which isolate a region of the bag for heat sealing, and (4) brings the isolated region into contact with a heater bar to effect a heat seal. The gripper bars are spring mounted and biased to a position forward of the heater bar to effectively isolate a region of the bag for sealing prior to seal formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.