Heat sealing method
US8444804B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2012 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Feb 14, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method for sealing film layers to form a sealed portion and a notch within the sealed portion, comprising: providing film layers between sealing jaws comprising a heat sealing element, with a sealing face having a length and a protrusion extending partly along the length of its sealing face; inducing a temperature gradient along the of sealing face length, wherein the temperature proximate to the protrusion is higher than at a distance from the protrusion; closing the jaws and simultaneously clamping the film at a location adjacent to the sealing face; holding the jaws closed for a period of time; and opening the jaws to release the layers of film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.