Japanese Patent JPS644898

B2

PURPOSE:To sufficiently knead a resin that is to be subjected to extrusion molding through a mouthpiece, by providing a plurality of manifolds at each of forward ends of multi-ramified type leading paths, and inclining the forward ends of these manifolds in the same direction against the radial direction of the mouthpiece. CONSTITUTION:In the annular mouthpiece for extrusion molding comprising an outer mold 1 with a concave cross section and an inner mold 2 positioned concentrically in the concave, the plurality of the leading paths 3 are provided to extend radially from a resin feeding port 4, and each of the leading paths 3 is ramified once or several times in a mating surface (A) to form final ramifications 31. The plurality of the manifolds 5 are provided to each final ramification 31, and the forward ends 52 of the final ramification 31 are inclined in the same direction against the radial direction of the mouthpiece. A resin flow path surface (B) having a space t1 is formed around the forward ends 52. Thus, since the resin can be sufficiently kneaded, a tube having a uniform thickness can be obtained by extrusion molding.

YAMADA TAKAO
NISHIDA KAZUO
SHINAGAWA YASUYUKI

JP13070281A

January 27, 1989

August 20, 1981

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MITSUBISHI PLASTICS IND

B21C25/02; B29B7/00; B29C48/09; B29C48/32

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