Method for extrusion coating multiple webs
US6656401B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 2001 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Oct 16, 2021 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/46
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The specification discloses a method for extrusion coating multiple substrate webs on a dual or tandem extruder system having multiple extruder stations. The method includes as an initial step providing a first substrate web and a second substrate web wherein each of the first and second substrate webs has a coating side and an underside. The webs are temporarily joined to form a composite web wherein the respective coating sides face outward and the respective undersides face one another. A first polymer coating is extruded on the coating side of the first web at a first extrusion station. Subsequently, a second polymer coating is extruded on the coating side of the second web at a second extrusion station. The extrusion coated first and second webs are then separated. The invention enables more efficient and economical use of dual or tandem extruder systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.