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    • 7. 发明公开
    • Tubing and method for making same
    • 它们的软管和制造方法
    • EP0987043A3
    • 2002-10-30
    • EP99122701.8
    • 1995-04-03
    • Wang, James C.
    • Wang, James C.
    • A61M25/00
    • B29C47/0023A61M25/0009A61M25/0054B29C47/0026B29C47/0028B29C47/003B29C47/023B29C47/06B29C47/065B29C47/26B29C47/266B29C47/28B29C47/92B29C2947/926B29C2947/92828B29L2031/7542
    • A method for making an elongated tube having an annular wall with an outer surface and an inner surface that defines a central passageway, the tube also having a first section comprised of a first resinous material, a second section comprised of a second resinous material, the first and second resinous materials being of different stiffness, and an intermediate section joining the first section and the second section, the intermediate section being a transition section in which the wall of the tube gradually changes from the first resinous material of the first section to the second resinous material of the second section to form a continuous unbroken tube of differential stiffness without abrupt joints, said method comprising the steps of: providing a first resinous stream of the first resinous material; providing a second resinous stream of the second resinous material; introducing the first and second resinous materials into separate flow channels in a co-extrusion head that defines a plurality of flow channels; controlling the flow of each of the first and second resinous streams into the co-extrusion head; causing the first resinous stream to join with the second resinous stream in the co-extrusion head to produce a contact volume of joint flow so as to form a wedge structure in the transition section in which the first resinous material extends into the second resinous material so that the second resinous material surrounds the wedge structure of the first material; controlling the flow of each resin stream within the co-extrusion head; and passing the resinous materials through an extrusion die to form a continuous unbroken tube of the desired length having the desired sections formed of the first and second resinous materials with the resinous materials naturally adhering to each other in the sections.
    • 10. 发明公开
    • Tubing and method for making same
    • 管材及其制造方法
    • EP0987043A2
    • 2000-03-22
    • EP99122701.8
    • 1995-04-03
    • Wang, James C.
    • Wang, James C.
    • A61M25/00B29C47/28B29C47/06
    • B29C47/0023A61M25/0009A61M25/0054B29C47/0026B29C47/0028B29C47/003B29C47/023B29C47/06B29C47/065B29C47/26B29C47/266B29C47/28B29C47/92B29C2947/926B29C2947/92828B29L2031/7542
    • A method for making an elongated tube having an annular wall with an outer surface and an inner surface that defines a central passageway, the tube also having a first section comprised of a first resinous material, a second section comprised of a second resinous material, the first and second resinous materials being of different stiffness, and an intermediate section joining the first section and the second section, the intermediate section being a transition section in which the wall of the tube gradually changes from the first resinous material of the first section to the second resinous material of the second section to form a continuous unbroken tube of differential stiffness without abrupt joints, said method comprising the steps of: providing a first resinous stream of the first resinous material; providing a second resinous stream of the second resinous material; introducing the first and second resinous materials into separate flow channels in a co-extrusion head that defines a plurality of flow channels; controlling the flow of each of the first and second resinous streams into the co-extrusion head; causing the first resinous stream to join with the second resinous stream in the co-extrusion head to produce a contact volume of joint flow so as to form a wedge structure in the transition section in which the first resinous material extends into the second resinous material so that the second resinous material surrounds the wedge structure of the first material; controlling the flow of each resin stream within the co-extrusion head; and passing the resinous materials through an extrusion die to form a continuous unbroken tube of the desired length having the desired sections formed of the first and second resinous materials with the resinous materials naturally adhering to each other in the sections.
    • 一种用于制造具有环形壁的细长管的方法,所述环形壁具有限定中央通道的外表面和内表面,所述管还具有由第一树脂材料构成的第一部分,由第二树脂材料构成的第二部分,所述 具有不同刚度的第一和第二树脂材料以及连接第一部分和第二部分的中间部分,中间部分是过渡部分,其中管的壁从第一部分的第一树脂材料逐渐变为 所述方法包括以下步骤:提供所述第一树脂材料的第一树脂流;在所述第二树脂材料的第二树脂流中形成具有不同刚度的连续不间断管, 提供第二树脂材料的第二树脂流; 将第一和第二树脂材料引入限定多个流动通道的共挤出头中的分开的流动通道中; 控制所述第一和第二树脂流中的每一个进入所述共挤出头的流动; 使第一树脂流与共挤压头中的第二树脂流接合以产生接触流量的接触体积,从而在过渡段中形成楔形结构,其中第一树脂材料延伸进入第二树脂材料中 第二树脂材料围绕第一材料的楔形结构; 控制共挤压头内每种树脂流的流动; 以及使树脂材料通过挤出模具以形成具有期望长度的连续不间断管,其具有由第一和第二树脂材料形成的期望部分,其中树脂材料在部分中彼此自然地粘合。