Bag of a flexible packing material and a method of manufacture thereof
US5860744A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | May 12, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B9/2056
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A bag made of a flexible packing material comprising a sheet of material having an inner face and an outer face and folded for the formation of a tube with an overlapping portion. In the overlapping portion, the packing material is sealed inner face to outer face by means of a lapseal. Along two side edge portions, the tube is welded inner face to outer face of the overlapping portion for obtaining a closed bag enclosing the packed product. The packing material provides a peel seal, when welded inner face to outer face and a strong seal when welded inner face to inner face. Seen relative to the bag, the packing material comprises an inner layer comprising polyethylene, and outer layer comprising a copolymer of polyethylene and polypropylene and a subjacent intermediate layer comprising polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.