Spiral die and laminate production method using same

Details Spiral die and laminate production method using same Spiral die and laminate production method using same

1995-09-20

1997-07-29

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Shaping against interior of a forming surface by rotation of...

264146, 26417129, 2642092, 2642098, 4251331, 425381, 425462, B29C 4706, B29C 4720

Patent

active

056519354

ABSTRACT:
A spiral die for forming a laminate includes an outer die ring, an inner die ring inserted into the outer die ring with a fit clearance therebetween, a plurality (m, a positive integer greater than 1) of spiral grooves each having a gradually decreasing depth disposed between the outer and inner die rings, and distribution paths for distributively introducing melted resin streams of a plurality (n, a positive integer satisfying n<m) of resin species in a prescribed order into said plurality (m) of spiral grooves. The individual resin streams distributed to the spiral grooves proceed along the spiral grooves to gradually overflow the respective spiral grooves and overlie each other in a prescribed order before the individual resin streams form a uniform tubular stream in a die axial direction.

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