Stretch-wrapped package, process and apparatus
US4079565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1974 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Mar 25, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B11/025
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
This invention provides an apparatus and process for making a unitary package which comprises a load that has a band formed of plural layers of a stretched material wrapped around it. The apparatus comprises a frame with a rotatable drive shaft driven by a drive mechanism, an arm secured to the drive shaft and a roll holding shaft rotatably mounted to the arm. A sensor device measures the thickness of a material roll placed on the roll holding shaft to control an electromagnetic brake mechanism mounted on the roll holding shaft to variably engage the roll holding shaft thus maintaining a constant tension on the film unwrapped from the roll. The steps of the process are placing a load on a support; locating a rolled-up sheet of a stretchable material on dispenser roll adjacent to the support; withdrawing a leading edge of the material from the dispenser roll and holding the leading edge of the material against the load. Relative movement between the dispenser roll and the support means is initiated but is restricted so that the material will be stretched with a sufficient amount of the stretched material being dispensed from the dispenser roll to provide a band comprising plural lay…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.