Process and apparatus for the production of sheeting having a color wedge
US4476075A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A slot die apparatus for the coextrusion of an endless sheet having a thickness of about 0.1-5 mm with an optionally dyed edge strip made from a narrower, optionally colored, melt stream of a width of about 100-500 mm and from a broader melt stream of a width of about 1,000-3,000 mm of a thermoplastic synthetic resin is provided by means of two parallel-operating extruders and associated melt pumps, with merging of the two melt streams. The apparatus is also provided by flanging together, by means of a flange, two dies at their end faces, these dies having identical cross sections and a corresponding width, comprising a spreader block, deckle, bottom lip, and top lip, and a flow channel made up from these components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.