Vacuum flow wrap packaging system and method of packaging
US8596026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2010 |
| Grant date | Dec 3, 2013 |
| Priority date | — |
| Expiry date | Aug 12, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B31/048
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method and packaging system for forming a sealed vacuum package having minimal residual air remaining. At least one vacuum lance is provided in the interior of a partially-formed package to withdraw the air, the package being closed on three sides and having a fourth side open for insertion of the vacuum lance. An air restriction can be provided along the fourth side to form a closed edge that prevents ingress of air into the package interior after the evacuation of air. In one aspect, the air restriction may comprise a pair of pinch rollers that compress the package at the fourth side edge to form a pinch seal that provides a relatively airtight air chamber inside of the package prior to and during sealing of the package. In another aspect, the air restriction may comprise a partial seal formed around the lances to prevent or minimize air from reentering the package. In yet another aspect, the air restriction may comprise a compressed air seal formed by an air compression device that keeps the ends of the film pressed together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.