挤出物胀大(dies well;Barus effect) 当高聚物熔体从小孔、毛细管或狭缝中挤出时挤出物在挤出模口后膨胀使其横截面大于模口横截面的现象。定量上用胀大比来表示。挤出物胀大在聚合物熔体中是常见的,这是由于聚合物熔体在模具内因流动而取向,在流出模口时分子重新蜷曲。挤出物胀大随切变速度增大而增大,在到达最大值后再下降。分子量增大和其他能增加缠结的因素(如长支链的增加)都将使挤出物胀大增大。
深入讨论了聚合物熔体在不同长径比、不同角度圆锥口模的挤出胀大现象及机理。
Discussed thoroughly the extrusion swell phenomenon and mechanism of polymer melts in conical die with different entrance angles and different ratios of length to diameter.
讨论了聚合物熔体经短口型挤出时的胀大现象及机理。
In this paper, the extrusion swell phenomena and mechanism for polymer melts from short dies are discussed.
深入讨论了聚合物熔体在不同长径比、不同角度圆锥口模的挤出胀大现象及机理。
This paper discusses thoroughly the extrusion swell phenomenon and mechanism of polymer melts in conical die with different entrance angles and different ratio of length to diameter.
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