Hygroscopic polymer absorbs moisture that seeps into its core. This moisture is introduced during various plastic processes, such as the cleaning and washing of granules. It seeps into the core due to the vapour pressure difference. During the monsoons, high humidity in the environment, and in winters, reverse osmosis also adds moisture inside the granules.
Engineering polymers, such as PET, are also hygroscopic in nature; thus, moisture can penetrate the core of the material. Therefore, high concentrations of low dew point air are required to eliminate this moisture.
What Problem Does It Cause?
If this core moisture is not removed before processing or converting from the granular stage to any component stage, it may lead to a reduction in the physical properties of the material and a poor surface finish. This occurs because the granules are brought into the molten phase by adding heat inside the screw barrel. At that moment, polymer bonds are in a vulnerable stage along with the steam formed from moisture evaporation. This steam becomes integrated into the polymer structure, reducing its strength. Therefore, in an ideal solution, one should reduce the moisture level below its maximum permissible limit.
Ideal Solution for Hygroscopic Polymer Drying: Bry-Air Dryers
At Bry-Air, we offer a range of dryers tailored to different types of polymers such as Nylon/PA66, PC, TPU, TPE, PET, PBT, POM, ABS or Semicon. These plastic polymers are used in the manufacturing of various applications, including packaging (PET), sheets (PC Sheets), automobile (lights, cluster meter, dashboard, air intake system, under the hood engine parts), electrical (switchgear), white goods (AC, washing machine, juicer mixer), mono filament medical (BCT), cables (solar cables, communication cables).
Different dryers offer unique features and come in various capacities, selected based on the type of polymer used. Nano dryer delivers (-) 40 °C dew point for quality and small quantity processors of special materials with low throughputs, providing a high precision output handling capacity of 6-12 kg/hr. It is used to treat polymers in applications such as automobile (switch parts, connector, handles), medical (IV set), electrical (PC switch, holder connector), mobile parts, aesthetic stationary items and toys.
To determine which dryer is best suited for your application, please contact us at: bryairmarketing@pahwa.com
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