公开(公告)号：US06616434B1

公开(公告)日：2003-09-09

申请号：US09636349

申请日：2000-08-10

申请人： Theodore A. Burnham ,  Jeffrey L. Ng

发明人： Theodore A. Burnham ,  Jeffrey L. Ng

IPC分类号： B29C4438

CPC分类号： B29C44/3446 ,  B29C44/60 ,  B29C47/92 ,  B29C2947/92019 ,  B29C2947/92209 ,  B29C2947/92333 ,  B29C2947/92419 ,  B29C2947/92514 ,  B29C2947/926 ,  B29C2947/92704 ,  B29C2947/92828 ,  B29C2947/92866 ,  B29C2947/92914

摘要： 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.

摘要翻译： 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。

公开(公告)号：US06602063B1

公开(公告)日：2003-08-05

申请号：US09621262

申请日：2000-07-21

申请人： Juan C. Cardona

发明人： Juan C. Cardona

IPC分类号： B29C4438

CPC分类号： B29C44/3446 ,  B29C44/60

摘要： The invention provides a blowing agent delivery system and method for introducing a blowing agent into a polymeric foam processing system. The delivery system is designed to introduce blowing agent into polymeric material within an extruder when polymeric material is being plasticated, for example, during the plastication period of an injection molding cycle. The rate of introduction of blowing agent into polymeric material may be coupled to the flow rate of polymeric material in the extruder to ensure precise control over blowing agent percentage in the resulting mixture of polymeric material and blowing agent. The delivery system is also designed to prevent the introduction of blowing agent into the polymeric material when polymeric material is not being plasticated, for example, during the injection period of an injection molding cycle. The delivery system may be used in conjunction with discontinuous systems including injection molding or blow molding systems.

摘要翻译： 本发明提供了一种用于将发泡剂引入聚合物泡沫处理系统中的发泡剂输送系统和方法。 递送系统被设计成当聚合物材料被塑化时，例如在注塑周期的塑化期间，将发泡剂引入挤出机内的聚合材料中。 将发泡剂引入聚合材料的速率可以与挤出机中的聚合物材料的流速相结合，以确保在聚合材料和发泡剂的混合物中精确控制发泡剂的百分比。 递送系统还被设计成当聚合物材料不被塑化时，例如在注塑周期的注射期间，防止将发泡剂引入聚合物材料中。 输送系统可以与包括注射成型或吹塑系统在内的不连续系统结合使用。