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    • 7. 发明申请
    • PROCESS FOR MANUFACTURING A WATER-RESISTANT TELECOMMUNICATION CABLE
    • 制造耐水电信电缆的方法
    • WO2005049303A1
    • 2005-06-02
    • PCT/EP2003/011995
    • 2003-10-29
    • PIRELLI & C. S.P.A.PAVAN, MassimilianoTESTI, StefanoDONETTI, RaffaellaPUPPI, CristianoMARITANO, Mauro
    • PAVAN, MassimilianoTESTI, StefanoDONETTI, RaffaellaPUPPI, CristianoMARITANO, Mauro
    • B29C47/10
    • C08J3/18B29C47/0011B29C47/0019B29C47/0026B29C47/1063B29C47/1081B29D11/00673B29K2105/0005C08J2329/04C08K5/005C08K5/053C08L29/04
    • A process for manufacturing a water-resistant telecommunication cable is disclosed, the cable comprising a solid and compact element comprising a water-soluble polymer material comprising a vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of 60-95% and a polymerisation degree higher than 1,800- and at least one solid low-melting and one solid high melting plasticizers; the process comprising producing in continuous the water-soluble polymer material by separately feeding in sequence a multi-screw extruder, in the flow direction, with the copolymer and the high melting plasticizer, melting and mixing them while transporting them through the extruder, and with the low melting plasticizer, melting and mixing it with the copolymer and the high melting plasticizer, subsequently homogenizing the copolymer and the plasticizers and finally discharging the melt, at a temperature lower or equal to 205°C. The invention further concerns a process for extruding the above PVA based water-soluble polymer material.The process of the invention allows to extrude PVA with an enhanced productivity and reproducibility requiring shorter times for absorbing the plasticizers onto the polymer.
    • 公开了一种用于制造防水通信电缆的方法,该电缆包括固体和致密元件,其包含水溶性聚合物材料,其包含水解度为60-95%且聚合度更高的乙烯醇/乙酸乙烯酯共聚物 比1,800-至少一种固体低熔点和一种固体高熔点增塑剂; 所述方法包括通过在流动方向上依次单独进料多股螺杆挤出机与共聚物和高熔点增塑剂一起单独进料来制造水溶性聚合物材料,在将它们输送通过挤出机时进行熔融混合,并且与 将低熔点增塑剂熔融并与共聚物和高熔点增塑剂混合,然后在低于或等于205℃的温度下均化共聚物和增塑剂并最终将熔体排出。 本发明还涉及一种用于挤出上述PVA基水溶性聚合物材料的方法。本发明的方法允许以提高的生产率和再现性挤出PVA,其需要较短的时间以将增塑剂吸收到聚合物上。