Method and apparatus for dispensing an amount of film relative to load girth
US8141327B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2010 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Apr 5, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B2210/18
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present disclosure provides a method and apparatus for dispensing a predetermined 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 at least a portion of a 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 the at least a portion of a revolution of the rotating ring and dispenser, a predetermined amount of film is dispensed and wrapped around the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.