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It is very easy to forget that plastic melts are not thermally stable over long periods at, or above, melt temperature. Equally, it is as easy to forget that the molten mass is not impervious to the effects of shear. Plastic Melts are not Newtonian in their behaviour. That is they do not react in a linear fashion when exposed to shearing of the melt or changes in temperature. A Newtonian melt would show a straight line graph when plotted for shear rate vs. shear stress which reflects the consistency of the viscosity. |
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发表于 2007-12-6 09:00:34
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