Annular die for a lamination product
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United States of America Patent
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-
Dec 31, 1991
Grant Date -
N/A
app pub date -
Aug 16, 1990
filing date -
Feb 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An annular die for a lamination product comprises a center core portion 2, four circular-plate-like rings 1 arranged around the center core portion in the vertical direction so as to form a resin passage, which is communicated with a die lip 7, at the inner surface of the circular-plate-like rings, wherein openings for feeding resin are formed so as to open at the outer circumferential portions of mating surfaces 11 of the circular-plate-like rings; manifolds 5 are formed in either one of the mating surfaces of the rings so as to extend from the opening 4 in a spiral form, the depth of the manifolds being gradually decreased toward the inside of the mating surfaces; and a final resin-flowing area 51 is formed to communicate the manifolds 5 with the resin passage.
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