Vacuum packaging bag and vacuum packaging method
US5894929A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1997 |
| Grant date | Apr 20, 1999 |
| Priority date | — |
| Expiry date | Jun 23, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D81/3461
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Disclosed is a sterilizing and vacuum packaging bag having at least one non-fused degassing portion, wherein an insufficiently fused area is present inside the degassing portion. The insufficiently fused area is lower in fusion strength than the vertical fused areas and a bag mouth fused area, and is fused so as to be separable by an increase in inner pressure. Further disclosed is a vacuum packaging method comprising using this sterilizing and vacuum packaging bag, including putting contents into the bag through an open end thereof, fusing the open end more firmly than the insufficiently fused area, performing microwave heating, separating films fused together at the insufficiently fused area at a stage that the surface temperature of the contents is also sufficiently elevated, and completely fusing the degassing portion after termination of microwave heating. As a result, in the vacuum packaging technique utilizing microwave heating, the surface temperature of the contents can be prevented from being lowered to obtain a good sterilized state. Further, even when the contents contain fluid water, leakage of water can be prevented during vacuum packaging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.