The case example described here is the processing of PET to sheet for thermoforming. Under temperature and in the presence of moisture, the molecular weight chain will decrease. The influence of moisture on the molecular weight of viscosity on PET (which is measured in IV – the intrinsic viscosity) with difference moisture levels over the same time and at the same temperature is shown in figure 1.1. Introduction In order to ensure product quality and operating efficiency when processing sensitive polymers, it is crucial to monitor certain key processing parameters.For polymers which degrade due to hydrolysis, shear stress, or due to thermal and/or oxidization, it is extremely useful to monitor the polymer viscosity online.
The case example described here is the processing of PET to sheet for thermoforming. Under temperature and in the presence of moisture, the molecular weight chain will decrease. The influence of moisture on the molecular weight of viscosity on PET (which is measured in IV – the intrinsic viscosity) with difference moisture levels over the same time and at the same temperature is shown in figure 1.
1. Introduction
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