Feed block for a flat coextrusion die
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United States of America Patent
Stats
-
Mar 24, 1987
Grant Date -
N/A
app pub date -
Mar 27, 1986
filing date -
Apr 1, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The block comprises a central channel (2) which feeds a first molten plastic, and at least one secondary channel (5, 10) which feeds a different molten plastic and connects to the central channel (2) upstream of the die, the central channel (2) in the connection zone, being equipped with a flat portion (11) which alters the cross-section of the channel, the said flat portion (11) being mounted in a removable piece (12) coaxial with the central channel and arranged in a guide tube (13) which intersects the central channel (2) and runs through the feed block (1), the said block being equipped with means (20), (21) for gradually withdrawing the removable piece (12) via the guide tube (13) and for replacing it by another removable piece (18) equipped with an identical or different flat portion (19). The block is particularly suitable for feeding a flat die which delivers films, sheets or composite panels.
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Cited Art Landscape
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