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    Method of forming and shaping plasticized mixtures by low to moderate shear extrusion
    1.
    发明授权
    Method of forming and shaping plasticized mixtures by low to moderate shear extrusion 失效
    通过低至中等剪切挤出成型和成型增塑混合物的方法

    公开(公告)号：US6113829A

    公开(公告)日：2000-09-05

    申请号：US115929

    申请日：1998-07-15

    申请人： Andrea W. Bookbinder ,  Devi Chalasani ,  Gregory P. Dillon ,  Kevin R. McCarthy ,  Brian E. Stutts ,  Michael E. Zak

    发明人： Andrea W. Bookbinder ,  Devi Chalasani ,  Gregory P. Dillon ,  Kevin R. McCarthy ,  Brian E. Stutts ,  Michael E. Zak

    IPC分类号： B28B3/20 ,  B28C7/00 ,  C04B35/195 ,  C04B35/622 ,  C04B35/632 ,  C04B35/636 ,  C04B38/00 ,  B29C47/00

    CPC分类号： B28B3/269 ,  C04B35/195 ,  C04B35/622 ,  C04B35/6365 ,  C04B38/0006

    摘要： A method for forming and shaping powder mixtures involves compounding, homogenizing, and plasticizing components to form a mixture. The components are powder materials, binder, solvent for the binder, surfactant, and non-solvent with respect to at least the binder, the solvent, and the powder materials. The non-solvent is lower in viscosity than the binder combined with the solvent. The components are chosen to result in improved wet green strength in the subsequently formed green body. The compounding is done by the steps of dry-mixing the powder material, surfactant and binder to form a uniform blend, adding the solvent to the resulting dry blend, and thereafter adding the non-solvent to the blend. The mixture is shaped by passing it through a low to moderate shear extruder, and then through a die to form a green body. The compounding and shaping steps are carried out at a temperature of no greater than ambient temperature. The method is especially suitable for RAM extrusion. Among the advantages, the method results in higher extrusion velocity, throughputs, and wet green strength, without increasing pressures and torques.

    摘要翻译： 用于形成和成形粉末混合物的方法包括混合，均化和增塑组分以形成混合物。 组分是至少粘合剂，溶剂和粉末材料的粉末材料，粘合剂，粘合剂的溶剂，表面活性剂和非溶剂。 非溶剂的粘度低于与溶剂结合的粘合剂。 选择这些组分以在随后形成的生坯中产生改善的湿绿色强度。 通过干粉混合粉末材料，表面活性剂和粘合剂以形成均匀的共混物，向所得干混物中加入溶剂，然后向混合物中加入非溶剂的步骤进行配混。 将混合物通过使其通过低至中等剪切挤出机成型，然后通过模头形成生坯体。 复合和成型步骤在不高于环境温度的温度下进行。 该方法特别适用于RAM挤出。 其优点之一是在不增加压力和转矩的情况下，可提高挤出速度，生产量和湿绿色强度。