Method for designing extrusion dies
    1.
    发明授权
    Method for designing extrusion dies 有权
    挤出模具设计方法

    公开(公告)号:US08682620B2

    公开(公告)日:2014-03-25

    申请号:US12949851

    申请日:2010-11-19

    IPC分类号: G06F17/50 G06F7/66

    摘要: A method of designing a die cavity that may include performing a flow analysis using characteristics of a predetermined die cavity, density and rheological properties of a material, and a flow rate of the material to calculate the pressure distribution exerted on the die cavity and cross-sectional flow profile. The method further includes a structural analysis using the calculated pressure distribution and structural characteristics of the die cavity to calculate a deformed die cavity. The flow analysis is repeated using the characteristics of the deformed die cavity to calculate a pressure distribution exerted on the die cavity and cross-sectional flow profile. The outcome is compared to determine if the pressure distributions and/or cross-sectional flow profiles converge. These steps are iteratively repeated until convergence of the pressure and/or cross-sectional flow profile is observed. The variation of the cross-sectional flow profile is analyzed to determine if it is below a predetermined tolerance.

    摘要翻译: 设计模腔的方法,其可以包括使用预定模腔的特性,材料的密度和流变特性以及材料的流速来执行流动分析,以计算施加在模腔上的压力分布, 截面流动剖面图。 该方法还包括使用计算的压模分布和模腔的结构特征来计算变形模腔的结构分析。 使用变形模腔的特征重复流动分析,以计算施加在模腔上的压力分布和横截面流动分布。 比较结果以确定压力分布和/或横截面流动剖面是否收敛。 迭代地重复这些步骤,直到观察到压力和/或横截面流动分布的收敛。 分析横截面流动剖面的变化以确定其是否低于预定的公差。

    Synthesis of polyol fatty acid polyesters using column with inert gas
stripping
    2.
    发明授权
    Synthesis of polyol fatty acid polyesters using column with inert gas stripping 失效
    使用惰性气体剥离柱合成多元醇脂肪酸聚酯

    公开(公告)号:US5945529A

    公开(公告)日:1999-08-31

    申请号:US683899

    申请日:1996-07-19

    IPC分类号: C07H13/06 C07C67/03

    CPC分类号: C07H13/06

    摘要: Processes for the synthesis of polyol fatty acid polyester by transesterification of a polyol comprise reacting polyol with a first portion of fatty acid lower alkyl ester to provide a first step reaction product in which substantially all of the polyol is reacted with at least one fatty acid lower alkyl ester. The processes then employ a multistage column providing substantial plug flow of liquid therein for further transesterification of the first step reaction product. Partially esterified polyol, a second portion of fatty acid lower alkyl ester and catalyst are fed to the column to form a mixture and cause further transesterification of the partially esterified polyol and fatty acid lower alkyl ester, with lower alkyl alcohol being formed as a by product. The resulting liquid mixture of reactants and product is passed in a first direction between adjacent stages through the column for further reaction of partially esterified polyol with fatty acid lower alkyl ester. An inert stripping or sparging gas is fed through the column in a second direction between adjacent stages, counter current to the flow of the liquid mixture between adjacent stages in the first direction, with radial shear agitation. The lower alkyl alcohol by-product of the polyol-fatty acid lower alkyl ester reaction is transferred from the liquid mixture to the inert gas.

    摘要翻译: 通过多元醇酯交换合成多元醇脂肪酸聚酯的方法包括使多元醇与脂肪酸低级烷基酯的第一部分反应,以提供第一步反应产物,其中基本上所有的多元醇与至少一种脂肪酸较低 烷基酯。 然后,该方法使用多级柱,其中提供液体的大量活塞流,用于第一步反应产物的进一步酯交换。 将部分酯化的多元醇,第二部分的脂肪酸低级烷基酯和催化剂加入到塔中以形成混合物,并使部分酯化的多元醇和脂肪酸低级烷基酯进一步酯交换反应,形成低级烷基醇作为副产物 。 所得到的反应物和产物的液体混合物在相邻级之间的第一方向通过柱,用于部分酯化的多元醇与脂肪酸低级烷基酯的进一步反应。 惰性汽提或喷射气体在相邻级之间的第二方向通过柱体进料,与径向剪切搅拌相反,在相邻级之间的液体混合物流在第一方向上。 多元醇 - 脂肪酸低级烷基酯反应的低级烷基醇副产物从液体混合物转移到惰性气体中。

    METHOD FOR DESIGNING EXTRUSION DIES
    4.
    发明申请
    METHOD FOR DESIGNING EXTRUSION DIES 有权
    设计挤出机的方法

    公开(公告)号:US20120130684A1

    公开(公告)日:2012-05-24

    申请号:US12949851

    申请日:2010-11-19

    IPC分类号: G06F17/50

    摘要: A method of designing a die cavity can include performing a flow analysis using characteristics of a predetermined die cavity design, density and rheological properties of a material to be extruded, and a flow rate of the material to calculate the pressure distribution exerted on the die cavity and cross-sectional flow profile. The method further includes performing a structural analysis using the calculated pressure distribution and structural characteristics of the die cavity to calculate a deformed die cavity. The flow analysis is then repeated using the characteristics of the deformed die cavity to calculate a pressure distribution exerted on the die cavity and cross-sectional flow profile. The calculated pressure distributions and/or cross-sectional flow profiles are compared to determine if the pressure distributions and/or cross-sectional flow profiles converge. These steps are iteratively repeated until convergence of the pressure and/or cross-sectional flow profile is observed. Once convergence is observed, the variation of the cross-sectional flow profile is analyzed to determine if it is less than a predetermined tolerance.

    摘要翻译: 设计模具腔的方法可以包括使用预定模腔设计特性,要挤出的材料的密度和流变特性以及材料的流速来计算施加在模腔上的压力分布的流动分析 和截面流动剖面。 该方法还包括使用计算出的模腔的压力分布和结构特征进行结构分析以计算变形的模腔。 然后使用变形模腔的特征重复流动分析,以计算施加在模腔上的压力分布和横截面流动分布。 比较计算出的压力分布和/或横截面流动分布,以确定压力分布和/或横截面流动分布是否收敛。 迭代地重复这些步骤,直到观察到压力和/或横截面流动分布的收敛。 一旦观察到收敛,则分析横截面流动分布的变化以确定其是否小于预定的公差。

    Continuous transesterification method for preparing polyol polyesters
    5.
    发明授权
    Continuous transesterification method for preparing polyol polyesters 失效
    连续酯交换法制备多元醇多酯

    公开(公告)号:US5648483A

    公开(公告)日:1997-07-15

    申请号:US481779

    申请日:1995-06-07

    CPC分类号: C07H13/06 C07C67/03

    摘要: Polyol polyesters can be made by a transesterification reaction of a polyol with a lower alkyl fatty acid ester. A by product of that reaction are the alcohols from the lower alkyl esters. These are usually removed from the transesterification reaction by inert gas stripping. The process herein links the transesterification reaction with a lower alkyl ester formation reaction. The transesterification reaction acts as a the source of the lower alkyl alcohols for the formation of the lower alkyl esters used in the polyol fatty acid polyester synthesis. A preferred method for both reactions uses a reactive absorption column.

    摘要翻译: 多元醇聚酯可以通过多元醇与低级烷基脂肪酸酯的酯交换反应来制备。 该反应的副产物是来自低级烷基酯的醇。 这些通常通过惰性气体剥离从酯交换反应中除去。 本文的方法将酯交换反应与低级烷基酯形成反应连接。 酯交换反应作为用于形成多元醇脂肪酸聚酯合成中使用的低级烷基酯的低级烷基醇的来源。 两种反应的优选方法使用反应性吸收塔。