Roller stretch pass through stretching apparatus and process
US4413463A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1980 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Oct 23, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B9/026
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A pass through apparatus and process for wrapping a web of stretched material around a conveyor transported load. The pass through apparatus has a film supply assembly on opposite sides of the load, each of the assemblies comprising a film dispenser and a powered roller mechanism which takes film from the film dispenser and pre-stretches it in the powered roller mechanism prior to the application of the film around the load. Once the load passes a sensing station, it is stopped and the clamping jaws draw the tensioned film around the load and clamp together short sections of film which have not been pre-stretched by the roller mechanisms. The film is then relaxed in the sealing area and is sealed in an untensioned un-pre-stretched state. The sealed webs are then severed allowing the wrapped load to be carried away by the conveyor with the film wrap slowly recovering its original configuration increasing the holding force of the wrap on the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.