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    • 3. 发明申请
    • METHOD AND INSTALLATION FOR TREATING PLASTIC TUBES WITH BI-AXIAL DRAWING
    • 用双轴绘图处理塑料管的方法和安装
    • WO1998013182A1
    • 1998-04-02
    • PCT/FR1997001653
    • 1997-09-18
    • ALPHACANPREVOTAT, BernardACKET, Jean-Jacques
    • ALPHACAN
    • B29B13/04
    • B29C55/26B29B13/024B29B13/04B29C31/002B29C2035/1616B29C2793/0081B29K2027/06B29K2105/258B29K2995/0053B29L2023/22
    • The invention concerns a method for treating plastic tubes, in particular PVC tubes, obtained by extrusion, whereby a tube is brought to a molecular orientation temperature, higher than room temperature, and is subjected to a bi-axial drawing by radial expansion and axial elongation, to obtain a bi-oriented tube whose mechanical properties are improved. The tube (T) is cut into elements (4) of predetermined length immediately after being extruded and its temperature is higher than the molecular orientation temperature, each element constituting a blank (5); each blank (5) is placed in a chamber (E) to be cooled therein by a fluid (F) to a temperature close to the molecular orientation temperature, the dwell time of the blank in the chamber being greater than the time of its production by extrusion; and the blank (5) is then extracted from the chamber (E) to be subjected to a treatment enabling its bi-orientation.
    • 本发明涉及一种用于处理通过挤出获得的塑料管,特别是PVC管的方法,由此使管达到高于室温的分子取向温度,并且通过径向膨胀和轴向伸长进行双向拉伸 ,得到机械性能提高的双向取向管。 将管(T)在挤出后立即切割成预定长度的元件(4),其温度高于分子取向温度,每个元素构成空白(5); 将每个坯料(5)放置在室(E)中以通过流体(F)在其中冷却到接近分子取向温度的温度,坯料在室中的停留时间大于其生产时间 通过挤出; 然后将空白(5)从腔室(E)中提取以进行使其双向取向的处理。
    • 10. 发明申请
    • METHOD AND INSTALLATION FOR MAKING PLASTIC TUBES WITH BI-AXIAL DRAWING, AND RESULTING PLASTIC TUBE
    • 用于制造具有双轴绘图的塑料管和塑料管的方法和安装
    • WO1998013190A1
    • 1998-04-02
    • PCT/FR1997001652
    • 1997-09-18
    • ALPHACANPREVOTAT, BernardACKET, Jean-Jacques
    • ALPHACAN
    • B29C49/08
    • F16L47/08B29C49/08B29C55/26B29C57/08B29C2049/465B29C2049/4652B29C2049/4655
    • The invention concerns a method for making plastic tubes, whereby a tube blank (Te) brought to a temperature close to molecular orientation temperature is subjected to a bi-axial drawing, by radial expansion of the tube blank inside a forming shaft (2), with formation of a contraction cavity at one end of the tube, by controlled displacement of this contraction cavity to the other end of the tube, and by longitudinal drawing. The radial expansion is carried out in at least two phases, viz. a first phase during which the tube blank (Te) is inflated to an intermediate diameter (Di) determined by a double-walled envelope (21), introduced into the forming shaft (2), with circulation of a hot fluid between the two walls of the envelope (21), and then the envelope is gradually removed from the forming shaft (2) to enable, during a second phase, the radial expansion of the plastic tube up to an internal diameter of the forming shaft (2), and its longitudinal drawing.
    • 本发明涉及一种制造塑料管的方法,其中通过管坯在成形轴(2)内部的径向膨胀使得温度接近分子取向温度的管坯(Te)进行双向拉伸, 在管的一端形成收缩空腔,通过将该收缩空间受控地移动到管的另一端,并通过纵向拉伸。 径向膨胀在至少两个阶段进行,即 第一阶段,其中管坯(Te)被膨胀到由双层壁封套(21)确定的中间直径(Di),引入到成形轴(2)中,在两个壁之间循环热流体 (21)的内径,然后将信封从成形轴(2)逐渐移除,使得在第二阶段期间使塑料管的径向膨胀达到成形轴(2)的内径,并且 其纵向图。