The reason why nylon parts are deformed is that they are hygroscopic, so they can be solidified in cold water immediately after being taken out of the mold. The post-treatment method is generally to adjust humidity with potassium acetate and water to solve deformation and internal stress, and then lathe processing. The ratio of potassium acetate to water is 1.25 to 1.

Polyamide (PA) refers to the polymer whose main chain contains polar amide group (-CO-NH-). PA, originally used as a raw material for manufacturing fibers, has become an engineering plastic widely used in industry because of its good toughness, wear resistance, self-lubrication and wide temperature range.

Extended data:

Hydrogen bonds can be formed between nylon molecules, which makes the structure easy to crystallize. Moreover, the intermolecular interaction is great, which gives nylon high melting point and mechanical properties. Because the amide group is a hydrophilic group, it has high water absorption. There are methylene and aryl groups in the chemical structure of nylon, which makes nylon flexible or rigid.

Adding additives such as carbon black to absorb ultraviolet rays into PA greatly enhances the self-lubricating property of PA and the abrasion of metal, which will affect the blanking and abrasion of parts during molding. Therefore, the combination of screw, barrel, rubber-passing head, rubber-passing ring and rubber-passing ring with strong feeding ability and high wear resistance must be adopted.