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    • 4. 发明授权
    • Co-extrusions methods
    • 共挤出方法
    • US5143677A
    • 1992-09-01
    • US458488
    • 1989-12-28
    • Robert J. BlembergJohn P. EcksteinMark E. Nordness
    • Robert J. BlembergJohn P. EcksteinMark E. Nordness
    • B29C47/06B29C47/28B29C47/56B32B27/08B32B37/15
    • B29C47/065B29C47/0023B29C47/0026B29C47/009B29C47/061B29C47/268B29C47/28B29C47/56B32B27/08B32B37/153B29C2791/007B29C47/062B29C47/26
    • 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).
    • 用于制造膜和包装的装置和方法,特别是包含偏二氯乙烯共聚物层的膜和包装。 优选的装置包括与具有内部十字头心轴(11)的环形挤出模具(10)组合的共挤出进料块(20)和用于将熔体流(24)从进料块输送到模头的中间间隔装置。 心轴(11)具有十字头凹槽(14),其优选设计类似于矩形的元件。 外模壁(19)的内表面优选地具有偏移部分,该偏移部分包括在离开凹槽时由熔体流(24)穿过的一对斜面(33A,33B)中的一个。 当熔体流穿过模具时,模具(10)将熔体流保持为单个基本形状。 VDC共聚物与VDC共聚物挤出机之间的设备表面屏蔽。 VDC共聚物挤出机以外的设备表面保护不受VDC共聚物的影响。 有效的屏蔽能够使用大于85cm的模具(10)。 圆周在其出口处(31)。