Fill tube spreader
US4986054A · kind A · utility
45Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jul 17, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B9/213
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming bags, such as from a continuous sheet of thermoplastic film fed forwardly and wrapped over a forming tube with the contents being filled into the bag through the tube and the end of the film formed into a bag tube being cross-sealed. The lower end of the filling tube is constructed so as to elastically deform and spread as sealing members move in laterally and thereby spread and flatten the tube to insure the making of a seal which is devoid to wrinkles and leakage possibilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.