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Extrusion Conditions on PP / diatomite Die Swell Behavior

30t / ℃ (b) PP/281 system, system of Figure 32 the dependence of B on the ? 3 we can see from the chart, as the temperature rose, PP / diatomite systems B decreases linearly between function relations, can the modern plastics processing applications in June 2009 indicated by the following formula: B A Plant + Plant 2 ? (2) where, and plant 2 is related with the melt elasticity coefficient, ? is temperature. Similarly, linear regression analysis, to determine the composite system under test conditions - Plant】 and - the value of plant 2. Table 2 shows a 5kg load of the composite system, and values. It can be seen, 2 values with the diatomaceous earth decreased with increasing volume fraction,[link widoczny dla zalogowanych], and with the increase of particle size has increased, _ extrudate swell plant reflects the temperature sensitivity. Table 2 when the load is 5kg PP / diatomite systems and * 5 for the diatomite volume fraction. In general, with increasing temperature, the resin composite system activity of the macromolecular chains increases, the stress (or strain) relaxation properties of strong, after deformation in the elastic recovery from the reduced capacity mode. Resulting extrudate swell behavior of complex systems weakened. 2.3B and the relationship between the die geometry in Figure 4 shows the load of 5kg, 2O0 ℃ when the temperature of PP / diatomite composites melt B and D relationship. It can be seen from Figure 4, B with D, increases. When the load and the length of the die is certain, the larger the diameter of the die, polymer melt volume flow rate the greater the time spent within the die along with shorter, convergent flow at the entrance to the flow field and place the die before the model was the stress from time to fully relax, the elastic recovery of deformation caused by a corresponding increase, resulting in increased degree of extrudate swell. Q8l_O1.2l_41.6L82.02.2D / B Figure 4PP / diatomite systems the relationship between B and D in Figure 5 to 210 ℃, 5kg load when the PP / diatomite systems melt B and die aspect ratio (L / D) relationship. Can be seen from Figure 5,[link widoczny dla zalogowanych], B-3 composite system are as L / D of the increases. For short die, the entrance effect of elastic energy storage is to produce extrudate swell of the main reasons. Swell the polymer melt extrusion with L / D attenuated the increase of production, belong to a strain relaxation process of ridicule. Figure 5PP / diatomite systems B and L / D relationship between the summary, under certain conditions, D and L / D of PP / diatomite composites melt elasticity characteristics are obvious. This indicates that the parameters of die properties of polymer processing has important practical significance. 3 Conclusion a) experimental conditions,[link widoczny dla zalogowanych], D and extrusion process conditions on PP / diatomite composite die expansion behavior is very obvious. b) composite system B with the increase of z-and non-linear increase, and increased linearly as the temperature dropped. c) When the load and temperature is constant,[link widoczny dla zalogowanych], B is nonlinear with the increase of D increase, and as L / D increase in non-linear decrease.
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