Die for extruding tubes composed of a plurality of layers
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 29, 1980
Grant Date -
N/A
app pub date -
Aug 23, 1977
filing date -
Aug 23, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A die comprising a central core and at least two thickness adjusting rings surrounding the core concentrically therewith and providing a resin passage between the core and the inner thickness adjusting ring and another resin passage between the inner and outer thickness adjusting rings, each of the rings having a planar seat surface. The rings are joined at their seat surfaces to the core, or alternatively, the inner ring is joined to the core and the outer ring to the inner ring similarly, whereby the rings are rendered radially shiftable for adjustment. Each of the resin passages is provided with resin inlets positioned substantially at the same level as the corresponding planar seat surface.
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