Rollers for prestretch film overwrap
US5186981A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1988 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Dec 22, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D5/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A coated roller for transportation and stretching of plastic film web during load unitization, and a process for preparation of the coated roller. A cylindrical metallic roller core is pitted by blasting, then primed, heated and immersed in a room-temperature liquid plastisol comprising vinyl particles dissolved in a plasticizer. The plastisol accumulates on the hot metal to a depth determined by immersion time. After removal, curing and cooling the coated core is machined by lathe to expose a cellular infrastructure and achieve a cylindrical coating coaxial with the core. The coated roller exhibits superior durability, resistance to tackifier additive buildup, and resistance to circumferential web slippage during web stretch between two rollers in a film path from a supply roll to a load being wrapped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.