Extrusion apparatus for producing composite structures
US4161385A · kind A · utility
5Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1977 |
| Grant date | Jul 17, 1979 |
| Priority date | — |
| Expiry date | Mar 10, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/31
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Extrusion-die system comprising an extrusion slit (3) fed upstream by two flows of polymeric materials, one of which issues from one or several flat conduits (7,8), the other from a multitude of small holes (18) drilled into a bar element of generally T-shaped cross-section (5). The cross-section of element (5) has a punch-like configuration with the holes being fashioned therein in two parallel rows and being staggered from one row to the other. The die system permits manufacture of products comprising a network of threads or filaments sheathed in a film or foil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.