Injection Molding process of Nylon material.
Conditions for using moulds and post-processing.
Mold temperature.
Mold temperature has a certain effect on crystallinity and molding shrinkage, high mold temperature, high crystallinity, wear resistance, hardness, elastic modulus increase, water absorption decreased, molding shrinkage of products increased, suitable for thick products; low mold temperature, low crystallinity, good toughness, high elongation, decreased shrinkage, suitable for thin products with good transparency. If the wall thickness is greater than 3mm, it is recommended to use a low temperature mold of 20,40C. The thin wall of the product is difficult to form or the mold with high crystallinity is required to be controlled by heating, and cold water is generally used to control the temperature if the product has certain flexibility. The diameter of runner and gate should not be less than 0.5 kilott (where t is the thickness of the plastic part). With a submerged gate, the minimum diameter of the gate should be 0.75mm.
The post-treatment of nylon products is to prevent and eliminate the residual stress in the products or the size change caused by moisture absorption. There are two kinds of post-treatment methods: heat treatment and humidity control.
1. Heat treatment.
Commonly used methods in mineral oil, glycerin, liquid paraffin and other high boiling point liquid, heat treatment temperature should be higher than the use of temperature 10-20 ℃, treatment time varies depending on the product wall thickness, thickness below 3mm for 10-15 minutes, thickness of 3-6mm time for 15-30 minutes, heat-treated products should pay attention to slow cooling to room temperature, in order to prevent quench caused stress regeneration in the products.
two。. Humidity control treatment.
The humidity control treatment is mainly carried out for the products with high environmental humidity, and there are three methods: one is the method of adjusting humidity with boiling water; the other is the method of adjusting humidity with boiling water. The third method of immersion in normal temperature water. Steam method.
The processing speed of the first method is faster, but it is easy to be supersaturated, and the third method has better efficiency and uniformity, but requires additional steam equipment.
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