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    • 2. 发明授权
    • Process for the production of a plastic tube to be used as an artificial
sausage casing
    • 用于生产用作人造香肠套管的塑料管的方法
    • US3950469A
    • 1976-04-13
    • US475022
    • 1974-05-31
    • Detlef GneussHans StrutzelWolfgang Meintzschel
    • Detlef GneussHans StrutzelWolfgang Meintzschel
    • B29C55/28B29D7/24B29C17/02
    • B29C55/28
    • This invention relates to a process for the manufacture of a plastic tube suitable for use as a sausage casing, which comprises extruding a crystalline thermoplastic material at a temperature above its crystalline melting point through an annular die of non-uniform cross-section, to produce a tube any cross-section of which varies continuously from a maximum to a minimum, the positions of the minimum and maximum thickness being diametrically opposed, the maximum being 1.3 to 3.0 times as thick as the minimum, cooling the tube to below its crystalline melting point, biaxially orienting the tube, and longitudinally stretching the biaxially oriented tube under conditions such that the temperature of the portion of the tube of maximum thickness is greater than that of the portion of the tube of minimum thickness. The invention also relates to the tube so produced.
    • 本发明涉及一种适合用作香肠肠衣的塑料管的制造方法,该方法包括通过非均匀横截面的环形模具在高于其结晶熔点的温度下挤出结晶热塑性材料,以产生 任何横截面的管子从最大值到最小值都是连续变化的,最小和最大厚度的位置是直径相对的,最大值是最小值的1.3至3.0倍,将管冷却到其结晶熔化以下 点,双轴定向管,并且在使得最大厚度的管的部分的温度大于最小厚度的管的部分的温度的条件下纵向拉伸双轴取向管。 本发明还涉及如此制造的管。
    • 4. 发明授权
    • Process and apparatus for the production of an extruded, stretched,
seamless tube
    • 用于生产挤压,拉伸,无缝管的方法和设备
    • US4886634A
    • 1989-12-12
    • US236912
    • 1988-08-26
    • Hans StrutzelPeter Wink
    • Hans StrutzelPeter Wink
    • B29C47/00B29C47/88B29C47/90B29C55/26B29C55/28B29L23/00
    • B29C55/26B29C47/0023B29C47/0026B29C47/8805B29C47/8825B29C47/903B29C47/908B29C47/0057B29C47/0059B29C47/8835B29C47/884B29C47/8865B29C47/8895B29C47/904Y10S264/902
    • A seamless parison extruded from an extruder via an annular die, passes through a calibrator and coaxially surrounds a probe pipe, which is made to extend through the annular die beyond the calibrator. On the probe pipe there is mounted a sealing element. Ahead of the sealing element, a pressure equal to atmospheric pressure prevails inside the tube and, after the sealing element, a higher pressure than atmospheric pressure prevails. The pressurization is achieved in that a second belt take-off folds together the tube, so that the compressed air fed in through the probe pipe causes a higher tube internal pressure, since the sealing element bears in a sealing manner against the inside of the tube. As a result, a substantial pressure separation is effected at the point of the sealing element. In a first heating chamber, the tube is heated to the stretching temperature and is transported by a second belt take-off at a stretching speed, increased relative to the take-off speed of the first belt take-off, to a second heating chamber, in which a heat setting of the tube takes place. From the heating chamber, the tube is transported onward at the same, greater or lower speed than the stretching speed by a third belt take-off and wound up by a deflection roller onto a wind-up roller.
    • 通过环形模头从挤出机挤出的无缝型坯通过校准器并且同轴地围绕探针管,探针管被制成延伸穿过环形模具超过校准器。 探针管上安装有密封元件。 在密封元件之前,等于大气压力的压力在管内盛行,并且在密封元件之后,压力高于大气压力。 加压是通过第二带取出将管折叠在一起的方式实现的,使得通过探针管供入的压缩空气导致较高的管内部压力,因为密封元件以密封方式抵靠管的内部 。 结果,在密封元件的点处实现了显着的压力分离。 在第一加热室中,将管加热至拉伸温度,并以相对于第一带取出速度的牵引速度增加的拉伸速度通过第二带取出输送到第二加热室 ,其中发生管的热定形。 从加热室,通过第三带取出,以与拉伸速度相同的速度或更高或更低的速度向前传送管,并将其通过偏转辊卷绕到卷绕辊上。