Method of and apparatus for forming weather strip by extrusion

Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting

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264 405, 264 407, 264167, 26417716, 26417717, 4251311, 425307, 425313, 425381, 425466, 425145, B29C 4716, B29C 4792

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054476704

ABSTRACT:
A method for forming an extruded weather strip having a trim portion and a lip having a thickened end portion. The method includes the steps of: extruding unvulcanized rubber through a head mounted on a downstream end of an extruder; roughly shaping the extruded unvulcanized rubber by causing the extruded unvulcanized rubber to move through an opening formed in a main die plate disposed downstream of the head so as to shape a portion of the extruded unvulcanized rubber corresponding to the trim portion and a portion of the extruded unvulcanized rubber corresponding to the lip into a shape having a width not smaller than the maximum width of the lip to be finally formed; forming the thickened end portion by causing the shaped unvulcanized rubber to pass through a space defined by a movable orifice plate which is disposed downstream of the main die plate and, while moving the movable orifice plate in the direction of width of the weather strip; and shaping the end of the lip by further advancing the shaped unvulcanized rubber through an end shaping structure, while moving the end shaping structure substantially together with the movable orifice plate.

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