Plastics Technology - Dedicated to improving Plastics Processing.
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[min] 170.0°C 180.0°C 190.0°C 200.0°C 210.0°C 220.0°C 230.0°C 240.0°C 250.0°C ln(k) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.0% 5.86 2.50 1.12 0.53 0.26 0.13 70.95e-03 38.79e-03 21.80e-03 2.0% 8.16 3 61 1.68 0.82 0.41 0.22 0.12 65.33e-03 37.28e-03 5.0% 13.41 6.17 2.97 1.48 0.77 0.41 0.23 0.13 73.33e-03 10.0% 18.61 8.85 4.39 2.26 1.21 0.66 0.37 0.22 0.13 20.0% 23.98 11.89 6.15 3.30 1.83 1.05 0.62 0.37 0.23 30.0% 26.78 13.55 7.16 3.93 2.24 1.31 0.79 0.49 0.31 40.0% 28.04 14.36 7.69 4.28 2.47 1.47 0.90 0.57 0.36 50.0% 28.71 14.81 8.00 4.50 2.63 1.59 0.99 0.63 0.41 60.0% 29.07 15.08 8.20 4.65 2.74 1.67 1.05 0.68 0.45 70.0% 29.23 15.21 8.30 4.74 2.81 1.73 1.10 0.73 0.49 80.0% 29.32 15.28 8.37 4.80 2.87 1.78 1.15 0.77 0.53 90.0% 29.44 15.39 8.47 4.88 2.94 1.85 1.21 0.82 0.58 95.0% 29.60 15.52 8.57 4.97 3.01 1.91 1.26 0.86 0.61 99.0% — -15.92 8.87 5.19 3.18 2.04 1.36 0.94 0.68 • Changes in lubricant packages in the resin, • Lot-to-lot variation in lubricants or colorants, • Screw wear over time. • Diferent screws. This situation is not ideal because controlling the amount of gas generation is more difcult than necessary. Ideally 100% of the CFA would activate from the processing temperatures alone to ensure a consistent production of gas within the process. When shear is the primary driver of CFA activation, it introduces additional variables that need to be controlled to produce consistent product quality. Knowing how the reaction progresses ahead of time allows for intelligent design of a production process to avoid needless waste of the CFA additive while ensuring a consistent activation to help improve product quality. FIG 5 Conversion Curves 100 80 60 40 20 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 T (250C) T (200C) T (240C) T (190C) T (230C) T (180C) T (220C) T (170C) T (210C) Minutes Percentage The output of the process shown in Fig. 4 is a kinetic model that can be used to make predictions for the rate of the reaction. The tables, which can be customized, are shown here. @plastechmag 61 Plastics Technology T E S T I N G C F A s