PA plastics are easy to absorb moisture and expand when used or stored in the air, making the product size unstable. It takes a long time to obtain a stable size. In addition, because PA is a highly crystalline material, it is easy to crystallize during molding. Sufficient, and cause internal stress to the product. When the PA product adopts the ordinary heat treatment method, the product is prone to oxidation and discoloration. When using the humidity control treatment, the demolded product can be immediately immersed in a certain temperature of hot water, which can not only isolate the air and prevent high-temperature oxidation for annealing, but also speed up the moisture absorption of PA, make it reach the moisture absorption balance as soon as possible, and improve the dimensional stability of the product Resistance and impact strength.
The method of humidity control treatment is to put the PA product in 80-121 degree water or a potassium acetate aqueous solution with a concentration of about 65.5% for a period of time, and then slowly cool it to room temperature. The processing time is usually proportional to the thickness of the product. |
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