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    • 3. 发明申请
    • METHOD FOR LONGITUDINAL STRETCHING A FILM IN SOLID STATE AND APPARATUS TO CARRY OUT THE METHOD
    • 固体拉伸膜的方法和实施方法的装置
    • WO2010128124A1
    • 2010-11-11
    • PCT/EP2010/056220
    • 2010-05-06
    • RASMUSSEN, Ole-BendtRASMUSSEN, Nikolaj Wettergren
    • RASMUSSEN, Ole-BendtRASMUSSEN, Nikolaj Wettergren
    • B29C55/06B29C55/18
    • B29C55/18B29C55/06B29C55/065
    • Method and apparatus for longitudinal orientation of thermoplastic film material (20) comprises a width-reduction zone upstream of the longitudinal stretching zone (9, 10), through which the width of the film is gradually reduced so as to allow longitudinal stretching without necking. The width-reduction zone comprises at least two sets of pleating rollers (7, 1) comprising intermeshing grooves or discs for pleating the material. The downstream (1) rollers comprise a mini-roller defined by the following measures a) the pitch of the corrugations, measured from middle of tip to middle of each neighbouring tip is 20 mm or less; b) the perimeter from middle of a tip to the middle of each neighbouring tip measured along the corrugated roller surface, divided by the said pitch is in the range between 1,10 and 1,80; and c) the diameter of the mini-roller, measured at the tips of the corrugations, is at the highest 4 times the said pitch. Preferably a pair of mini-roller sets is arranged on opposing sides of the film in reciprocating mounts enabling alternate entwining of the film around one then the other mini-roller. The method allows achievement of high tensile strength, yield point, resistance to tear propagation and puncture resistance, especially for polyethylene and polypropylene films.
    • 热塑性薄膜材料(20)的纵向取向的方法和装置包括在纵向拉伸区域(9,10)上游的宽度减小区域,通过该宽度减小区域,薄膜的宽度逐渐减小,以允许纵向拉伸而不缩颈。 宽度减小区包括至少两组打褶辊(7,1),其包括用于打褶材料的相互啮合的凹槽或盘。 下游(1)辊包括由以下措施限定的微型辊:a)从每个相邻尖端的尖端到中间测量的波纹的间距为20mm或更小; b)沿着波纹辊表面测量的每个相邻尖端的中部至中间的周长除以所述间距在1,10和1,80之间的范围内; 和c)在波纹尖端测量的微型滚筒的直径为所述间距的最高4倍。 优选地,一对微型辊组布置在膜的相对侧的往复运动安装件中,使得膜可以绕着另一个微型辊交替缠绕。 该方法可以实现高拉伸强度,屈服点,抗撕裂传播和抗穿刺性,特别是聚乙烯和聚丙烯薄膜。