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    • 8. 发明授权
    • Blowing agent metering system
    • 吹气剂计量系统
    • US06616434B1
    • 2003-09-09
    • US09636349
    • 2000-08-10
    • Theodore A. BurnhamJeffrey L. Ng
    • Theodore A. BurnhamJeffrey L. Ng
    • B29C4438
    • B29C44/3446B29C44/60B29C47/92B29C2947/92019B29C2947/92209B29C2947/92333B29C2947/92419B29C2947/92514B29C2947/926B29C2947/92704B29C2947/92828B29C2947/92866B29C2947/92914
    • The invention provides a blowing agent metering system and method for use in polymeric foam processing. The system may be used to control the rate of introduction of blowing agent into polymeric material in a processing apparatus to form a mixture having the desired blowing agent weight percentage. The metering system includes a restriction orifice which is positioned in a pathway between a blowing agent source and a blowing agent port within a foam processing apparatus. The metering system measures the pressure differential as blowing agent flows across the restriction orifice from the source to the port and may also measure the temperature of the blowing agent at one or more locations. Using a pre-determined relationship between the flow rate, the orifice dimensions (e.g., length, diameter) and the measured variables (e.g., pressure differential, temperature), a controller of the system adjusts the pressure upstream of the restriction orifice in response to inputs of the measured variables to maintain a pressure differential across the orifice that provides the desired blowing agent flow rate.
    • 本发明提供一种用于聚合物泡沫处理的发泡剂计量系统和方法。 该系统可用于控制在加工设备中将发泡剂引入聚合材料中的速率,以形成具有所需发泡剂重量百分比的混合物。 计量系统包括限制孔口,该限制孔口位于泡沫处理装置内的发泡剂源和发泡剂口之间的通路中。 计量系统测量发泡剂从限流孔流过端口的压差,也可测量一个或多个位置上发泡剂的温度。 使用流量,孔口尺寸(例如长度,直径)和测量变量(例如,压差,温度)之间的预定关系,系统的控制器响应于 测量的变量的输入以维持提供所需发泡剂流速的孔口两端的压差。
    • 10. 发明授权
    • Method and extrusion apparatus for degassing thermoplastic plastics
material melts
    • 用于脱泡热塑性塑料材料的方法和挤出设备熔化
    • US4902455A
    • 1990-02-20
    • US290488
    • 1988-12-27
    • Hans Wobbe
    • Hans Wobbe
    • B29C47/40B29C47/50B29C47/76B29C47/92
    • B29C47/367B29C47/364B29C47/92B29C2947/92019B29C2947/92161B29C2947/92314B29C2947/924B29C2947/92419B29C2947/926B29C2947/92657B29C2947/92828B29C2947/92876B29C2947/92904B29C47/0009Y10S425/812
    • A method of degassing thermoplastic plastic melts over a wide range of viscosities in a degassing extruder including a plurality of sequential degassing sections. Each degassing section includes at least one screw section having flights formed thereon. Each section includes a degassing region and a metering section downstream thereof. The height and length with which the flights are filled in the degassing regions in the individual degassing sections is controlled by the comparison of a pressure gradient measured in the metering region of that section with a desired pressure gradient and on the basis of this, the melt is conveyed with substantially the same throughput capacity in each degassing section. As a result of these measures, the degassing is effected in all of the degassing sections with optimally partially filled screw threads and with an optimum filling length of the worm threads, which is independent of the viscosity of the melt. The number of flights, the depth and width of the flights and the pitch of the flights may be identical in all degassing sections thus simplifying the manufacture of the screw.
    • 一种在脱气挤出机中在宽范围的粘度下脱气热塑性塑料的方法,其包括多个连续的脱气部分。 每个脱气段包括至少一个具有形成在其上的飞行的螺杆部分。 每个部分包括脱气区域和其下游的计量段。 通过将在该部分的计量区域中测量的压力梯度与期望的压力梯度进行比较来控制在单个脱气部分中将排料填充在脱气区域中的高度和长度,并且基于此,熔体 在每个脱气部分中具有基本相同的生产能力。 作为这些措施的结果,在具有最佳部分填充的螺纹的所有脱气部分中进行脱气,并且与蜗杆的最佳填充长度无关,其与熔体的粘度无关。 飞行次数,飞行的深度和宽度以及飞行的间距可以在所有脱气部分中相同,因此简化了螺杆的制造。