Internal air cooling of tubular plastic film
US4236884A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 5, 1975 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | Sep 5, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/912
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A rotary die assembly for extruding plastic tube, having a plurality of discrete cooling air inlet conduits extending through the male member of the die and connected at their inlet ends to circumferentially spaced apart positions to a wall of an annular inlet plenum so as to receive inlet air through the wall; the plenum is located outside of and generally coaxially with the rotating die members, the remaining walls of the plenum being stationary and connected to receive a supply of cooling air; exhaust air from the interior of the extruding tube similarly passes through a number of discrete conduits to a discharge plenum; the conduits are insulated to limit heat transfer between the heated die elements and the flowing air; a transition assembly enables the inner air to be efficiently distributed and the outlet air to be efficiently divided into the flows mentioned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.