Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Of varying cross-sectional area or with intermittent...
Patent
1997-06-30
1999-09-28
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Of varying cross-sectional area or with intermittent...
26417716, 425381, 425465, 425466, B29C 4716
Patent
active
059583185
ABSTRACT:
A die is formed with an opening having substantially the same shape as a fundamental cross-sectional shape of an extrusion member. A first core is formed with a projecting portion projecting forward beyond a front surface of the die. A movable die for changing the external shape of a sealing portion is disposed on the front surface of the die. The movable die is allowed to move between a position where a curved surface formed at the forward end thereof is kept away from the projecting portion of the first core and another position where the curved surface comes close to the projecting portion. Further, first and second movable cores are inserted in the opening of the die, these movable cores being moved forward and backward along the direction in which EPDM is extruded.
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patent: 5110529 (1992-05-01), Arima
patent: 5441688 (1995-08-01), Goto et al.
patent: 5447670 (1995-09-01), Ito et al.
patent: 5486325 (1996-01-01), Arima
Heitbrink Jill L.
Toyoda Gosei Co,., Ltd.
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