Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1989-12-28
1992-09-01
Thurlow, Jeffrey
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264514, 2642098, 4251331, 425462, B29C 4706, B29C 4720
Patent
active
051436779
ABSTRACT:
Apparatus and method for fabricating films and packages, especially films and packages containing a layer of vinylidene chloride copolymer. The preferred apparatus includes a coextrusion feedblock (20) in combination with an annular extrusion die (10) having an internal crosshead mandrel (11), and intervening spacing means for conveying the melt stream (24) from the feedblock to the die. The mandrel (11) has a cross-head groove (14), whose preferred design resembles elements of a rectangle. The inner surface of the outer die wall (19) preferably has an offset portion, including one of a pair of ramps (33A, 33B) traversed by the melt stream (24) as it leaves the groove. The die (10) maintains the melt stream in a single basic shape as the melt stream traverses the die. The VDC copolymer is shielded from the equipment surfaces beyond the VDC copolymer extruder. Equipment surfaces beyond the VDC copolymer extruder are protected from the VDC copolymer. The effective shielding enables use of a die (10) greater than 85 cm. circumference at its exit (31).
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Blemberg Robert J.
Eckstein John P.
Nordness Mark E.
American National Can Company
Stenzel Robert A.
Thurlow Jeffrey
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