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A multiple-step slit die rheometer for Theological characterization of extruded starch melts

机译:用于挤出淀粉熔体流变学表征的多步狭缝模头流变仪

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摘要

Extrusion cooking is a very important process in the field of cereal and snack manufacturing. The Theological properties of the starch based matrix strongly influence this process. A newly developed online rheometer was mounted on a twin screw extruder in order to measure these properties. It was possible to obtain viscosity of wheat flour and corn grits at typical extrusion cooking conditions over a shear rate range of three decades. Flow curves for varying screw speed and water content at a constant thermome-chanical history of the starch were measured. Also the temperature dependence of the apparent viscosities could be determined showing activation energies in the range found for synthetic polymers. Furthermore, additional pressure drops that occur at step changes of the slit height were detected. Thus, it was possible to evaluate visco-elastic properties of extruded starch melts at different extrusion cooking conditions.
机译:挤压蒸煮是谷物和零食制造领域中非常重要的过程。淀粉基基质的神学特性强烈影响这一过程。为了测量这些性能,将新开发的在线流变仪安装在双螺杆挤出机上。在典型的挤压蒸煮条件下,以三十年的剪切速率范围获得小麦粉和玉米粉的粘度是可能的。在恒定的淀粉热力学历史下,测量了改变螺杆转速和水含量的流量曲线。还可以确定表观粘度的温度依赖性,显示出在合成聚合物发现的范围内的活化能。此外,检测到在缝隙高度的阶梯变化处出现的附加压降。因此,可以评估在不同挤出蒸煮条件下挤出淀粉熔体的粘弹性。

著录项

  • 来源
    《Journal of food engineering》 |2013年第2期|398-403|共6页
  • 作者单位

    Institute of Process Engineering in Life Sciences, Section I: Food Process Engineering, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany;

    Institute of Process Engineering in Life Sciences, Section I: Food Process Engineering, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany;

    Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, KaiserstrajSe 12, 76131 Karlsruhe, Germany;

    Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany;

    Institute of Process Engineering in Life Sciences, Section I: Food Process Engineering, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    extrusion cooking; online rheometer; viscosity; flow curve; elastic properties; activation energy;

    机译:挤压蒸煮;在线流变仪;粘度流量曲线弹性活化能;

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