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    • 35. 发明授权
    • Foam sheet extrusion die apparatus, and system with adjustable choke area
    • 泡沫片材挤出模具设备,以及可调节扼流圈面积的系统
    • US5622732A
    • 1997-04-22
    • US349524
    • 1994-12-05
    • Robert W. Beckwith
    • Robert W. Beckwith
    • B29C47/20B29C47/22B29C47/86B29C47/92
    • B29C44/465B29C47/20B29C47/22B29C47/225B29C47/54B29C47/86B29C47/862B29C47/864B29C47/92B29C2947/92152B29C2947/92647B29C2947/92704B29C2947/92809B29C2947/92904B29C2947/92971B29C47/0023B29K2105/04
    • An extruder die apparatus, for the extrusion of a thermoplastic material, which die apparatus has an adjustable choke ring. The apparatus comprises an extruder housing having an axial bore for the extrusion of thermoplastic material therethrough from the inlet to the outlet of the bore, an inner die lip and an outer die lip about the bore and within the housing, the lips forming a concentric die gap passageway for the extrusion of a thermoplastic material from the one to the other end of the die, and a choke gap within said thermoplastic material flow passageway having a movably positioned choke ring. The choke ring has a plurality of individual, axially extending castellations thereon, some having oval receiving holes therein. These separate, castellated sections may be adjusted incrementally and independently by a plurality of eccentric bolts extending through the housing and the oval receiving holes, to provide selected areas within the choke gap having a restricted cross section thermoplastic material flow area. The restricted choke gap provides for an improved distribution of the thermoplastic material being extruded through the choke gap prior to being extruded through the die gap.
    • 用于挤出热塑性材料的挤出机模具装置,该模具装置具有可调节的扼流圈。 该装置包括挤出机壳体,该挤出机壳体具有轴向孔,用于从孔的入口到出口挤出热塑性材料,内模唇和围绕孔的外模唇和壳体内,唇形成同心模 用于将热塑性材料从模具的一端挤出到另一端的间隙通道,以及在所述热塑性材料流动通道内具有可移动定位的扼流圈的阻塞间隙。 扼流环在其上具有多个单独的轴向延伸的雉ell,其中一些在其中具有椭圆形的接收孔。 这些分开的cast形部分可以通过延伸穿过壳体和椭圆形接收孔的多个偏心螺栓递增且独立地调节,以提供扼流间隙内的选定区域具有限制的横截面热塑性材料流动面积。 限制的扼流间隙提供了在被挤出通过模具间隙之前通过扼流间隙挤出的热塑性材料的改进的分布。
    • 37. 发明授权
    • Making large-diameter pipe
    • 制大口径管
    • US5261988A
    • 1993-11-16
    • US885751
    • 1992-05-18
    • Byron DikisJohn Charaktinos
    • Byron DikisJohn Charaktinos
    • B29C47/00B29C47/20B29C47/88B29C47/90B29C53/78B29C47/30B29C47/86B29C53/68
    • B29C47/0028B29C47/0019B29C47/0023B29C47/003B29C47/12B29C47/882B29C47/901B29C47/908B29C53/78B29C47/02B29L2031/60
    • A large-diameter plastic pipe is made by extruding from an extruding-nozzle assembly a hollow thermoplastic strip having an outer rectangular cross section and formed with longitudinally extending outer walls and webs having inner surfaces and defining a plurality of longitudinally extending internal cells separated by the webs from one another. Substantially only the inner surfaces of the outer walls and the cell-forming webs are then cooled to size the strip and provide it with a predetermined compressive strength stable up to a predetermined critical pressure of the design strength while externally shielding external surfaces of the strip and thereby preventing cooling of same. Then the walls arc heated at external contact surfaces thereof to a temperature sufficient for welding and the strip is coiled onto a drum helically with contiguous turns of the strip engaging at the contact surfaces and axially pressing these contact surfaces together to butt weld the turns together with an axial pressure below the critical pressure of the design strength.
    • 大直径塑料管是通过从挤压喷嘴组件挤出而制成的,该中空热塑带具有外部矩形横截面,并形成有纵向延伸的外壁和具有内表面的腹板,并限定多个纵向延伸的内部细胞, 网彼此。 然后,基本上只有外壁和细胞形成腹板的内表面被冷却以对带材进行定尺并提供预定的抗压强度,直到设计强度的预定临界压力稳定,同时外部屏蔽带材的外表面, 从而防止其冷却。 然后,壁在其外部接触表面处被加热到足以焊接的温度,并且将钢带螺旋地卷绕到鼓上,连续的条带在接触表面处接合,并将这些接触表面一起轴压在一起,以将匝与 轴向压力低于设计强度的临界压力。