Method for dispensing a predetermined amount of film relative to load girth
US7707801B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 2006 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Nov 21, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B2210/18
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method and apparatus for dispensing a predetermined fixed amount of pre-stretched film based upon load girth. A non-rotating ring carries a belt. A film dispenser is mounted on a rotating ring, and the rotating ring includes a pulley that connects to the belt. Based upon the girth of the load to be wrapped, an amount of pre-stretched film to be dispensed for each revolution made by the rotating ring is determined. Good wrapping performance in terms of load containment (wrap force) and optimum film use is obtained by dispensing a length of pre-stretched film that is between approximately 100% and approximately 130% of load girth. Once the amount of film to be dispensed per revolution is determined, a mechanical ratio of ring drive to final pre-stretch surface speed (i.e., number of pre-stretch roller revolution/ring rotation) can be set. Thus, for each revolution of the rotating ring and dispenser, a predetermined fixed amount of film is dispensed and wrapped around the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.