Document Type and Number:
Japanese Patent JPH0374619
Kind Code:
B2
Abstract:
PURPOSE:To save labor hour and cost for application of the titled manufacture, by a method wherein after an outer wall having an outer layer part of a port and an inner wall on the inside of a trough part of the outer wall have been molded continuously, the same is cut off at an end part of the outer layer part of the port, the diameter of one end part of the inner wall positioning at the inside of the outer layer part of the port of a double wall molded member is made to expand by heating and softening the same and the port is molded. CONSTITUTION:When pressure welding of molten resin is performed on a mold surface of a molding block 21', an outer layer part 33 of a port wherein a trough part 32' whose inside diameter is larger than that of a trough part 32 by about twice as thick as a thickness of an inner wall 4 and a crest part 31' are connected alternately with each other is molded. Thus an outer wall wherein the crest part 31 and the trough part 32 are connected alternately with each other and possesses the outer layer parts 33 of the ports at fixed intervals is molded continuously. Simultaneously with molding of an outer wall 3 molten synthetic resin is extruded cylindrically into the outer wall 3 through an annular second resin passage 12 of a molten resin extruding part 1 and the cylindrical inner wall 4 which is made to fuse to the inside of a trough part 32 is molded continuously. The diameter of one end part of this double wall molded member A is expanded by softening the one end part 41 after the double wall molded member A has been cut off at an end part of the outer layer part 33 of the port.
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Application Number:
JP27137484A
Publication Date:
November 27, 1991
Filing Date:
December 21, 1984
Export Citation:
International Classes:
B29C49/00; B29C57/02; B29C69/02; B29D23/00; B29D23/18; B29D99/00; B29L23/18; B29L31/60
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