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10 条记录 (耗时 0.014 秒)

    Process of making hollow polyamide filaments
    1.
    发明授权
    Process of making hollow polyamide filaments 失效
    制造中空聚酰胺丝的工艺

    公开(公告)号：US5318738A

    公开(公告)日：1994-06-07

    申请号：US45295

    申请日：1993-04-13

    申请人： Nirmal K. Agarwal ,  Raymond Longhi ,  Sundar M. Rao

    发明人： Nirmal K. Agarwal ,  Raymond Longhi ,  Sundar M. Rao

    IPC分类号： D01D5/24 ,  D01F6/60 ,  D01D5/253 ,  D01F1/08

    CPC分类号： D01F6/60 ,  D01D5/24 ,  Y10T428/2975

    摘要： An improved process for preparing polyamide hollow filaments wherein an N,N'-dialkyl polycarbonamide is melt blended with the molten fiber-forming polyamide prior to spinning into filaments. The polycarbonamide substantially decreases the collapsing of the voids which naturally occurs immediately after spinning and before the filaments are completely cool.

    摘要翻译： 一种制备聚酰胺中空丝的改进方法，其中N，N'-二烷基聚碳酰胺在纺丝成长丝之前与形成熔融的纤维的聚酰胺熔融共混。 聚碳酰胺基本上减少了在纺丝之后和丝完全冷却之前自然发生的空隙的塌陷。

    Apparatus for determining flow behavior index
    3.
    发明授权
    Apparatus for determining flow behavior index 失效
    用于确定流动行为指数的装置

    公开(公告)号：US5014545A

    公开(公告)日：1991-05-14

    申请号：US587152

    申请日：1990-09-19

    申请人： Sundar M. Rao

    发明人： Sundar M. Rao

    IPC分类号： G01N11/04

    CPC分类号： G01N11/04

    摘要： An apparatus for on-line determination and control of the Flow Behavior Index of a molten polymer stream are disclosed along with methods for using the Index as a means for monitoring and controlling polymer quality. In particular, the Index may be used to monitor and control on-line the levels of branching in the polymer and the polymer's molecular weight distribution.

    摘要翻译： 公开了用于在线确定和控制熔融聚合物流的流动行为指数的装置以及使用该索引作为监测和控制聚合物质量的手段的方法。 特别地，该索引可以用于在线监测和控制聚合物中支化的水平和聚合物的分子量分布。

    Method for controlling polymer viscosity
    4.
    发明授权
    Method for controlling polymer viscosity 失效
    控制聚合物粘度的方法

    公开(公告)号：US4952345A

    公开(公告)日：1990-08-28

    申请号：US308773

    申请日：1989-02-10

    申请人： Sundar M. Rao ,  Richard P. Dale ,  Laura A. Murphy

    发明人： Sundar M. Rao ,  Richard P. Dale ,  Laura A. Murphy

    IPC分类号： D01D1/04 ,  D01F6/60

    CPC分类号： D01D1/04 ,  D01F6/60

    摘要： Uniformity of properties of spun polyamide filaments is improved by treating flake polyamide with successive nitrogen gas streams, the first having a variable temperature and water content, and the second being dry but having a variable flow rate. Viscosity of the molten polyamide from a melter for the flake is determined by measuring differential pressure across a transfer pipe. The viscosity measurement is used by automatic control apparatus to control the flow rate of the second stream, and the moisture content of a make-up stream added to the first stream. The flow rate of the make-up stream is controlled to maintain the second stream within limits, and the temperature of the first stream is controlled to maintain the flow rates of the make-up and second streams within limits.

    Static mixer for two or more fluids
    7.
    发明授权
    Static mixer for two or more fluids 失效
    用于两种或多种流体的静态混合器

    公开(公告)号：US5388906A

    公开(公告)日：1995-02-14

    申请号：US809841

    申请日：1991-12-18

    申请人： Sundar M. Rao

    发明人： Sundar M. Rao

    IPC分类号： B01F5/00 ,  B01F5/04 ,  B01F5/06

    CPC分类号： B01F5/045 ,  B01F2005/0034

    摘要： Distribution of a fluid additive through multiple passages across the cross section of a pipe carrying molten/fluid polymer wherein the polymer flow is distributed across the cross section of the pipe provides uniform distribution of the fluid additive when the passages are directed in the downstream direction of flow and substantially parallel to the longitudinal axis of the pipe carrying the polymer. This device is advantageous for mixing of two or more fluids independent of the viscosity differences.

    摘要翻译： 流体添加剂通过穿过承载熔融/流体聚合物的管道的横截面的多个通道的分布，其中聚合物流分布在管道的横截面上，当通道沿着管道的下游方向被引导时，流体添加剂均匀分布 并且基本上平行于承载聚合物的管的纵向轴线。 该装置有利于独立于粘度差异的两种或多种流体的混合。

    Polyamide hollow filaments
    9.
    发明授权
    Polyamide hollow filaments 失效
    聚酰胺中空丝

    公开(公告)号：US5370935A

    公开(公告)日：1994-12-06

    申请号：US208911

    申请日：1994-03-11

    申请人： Nirmal K. Agarwal ,  Raymond Longhi ,  Sundar M. Rao

    发明人： Nirmal K. Agarwal ,  Raymond Longhi ,  Sundar M. Rao

    IPC分类号： D01D5/24 ,  D01F6/60 ,  D02G3/00 ,  D01D5/253 ,  D01F1/08

    CPC分类号： D01F6/60 ,  D01D5/24 ,  Y10T428/2975

    摘要： An improved process for preparing polyamide hollow filaments wherein an N,N'-dialkyl polycarbonamide is melt blended with the molten fiber-forming polyamide prior to spinning into filaments. The polycarbonamide substantially decreases the collapsing of the voids which naturally occurs immediately .after spinning and before the filaments are completely cool.

    摘要翻译： 一种制备聚酰胺中空丝的改进方法，其中N，N'-二烷基聚碳酰胺在纺丝成长丝之前与形成熔融的纤维的聚酰胺熔融共混。 聚碳酰胺基本上减少了自然发生的空隙的塌陷，在旋转之后以及丝完全冷却之前。

    Process for modifying polyamide dyeability using co-fed polyamide flake
    10.
    发明授权
    Process for modifying polyamide dyeability using co-fed polyamide flake 失效
    使用CO-FED聚酰胺粉改性聚酰胺可溶性的方法

    公开(公告)号：US5166278A

    公开(公告)日：1992-11-24

    申请号：US511178

    申请日：1990-04-17

    申请人： Sundar M. Rao

    发明人： Sundar M. Rao

    IPC分类号： D01D5/096 ,  D01D1/09 ,  D01F1/06 ,  D01F6/60 ,  D01F6/90

    CPC分类号： D01F1/06 ,  D01F6/60

    摘要： A process for modifying the dyeability of polyamide polymers is disclosed, the process involving the addition of co-fed polyamide flake of the same type of polyamide as the base polyamide with the co-fed flake having a significant effect on the final dyeability. The additive flake comprises high- or low-amine-end polyamide flake which is mixed and melted with the base polyamide to adjust the total number of amine ends in the polymer, thereby controlling the polymer dyeability.