چرا از مواد خام پلاستیکی پخته استفاده می کنیم؟?

چرا از مواد خام پلاستیکی پخته استفاده می کنیم؟?

ABS, کامپیوتر, PA6 types of plastic raw materials need to be baked, اما PP, TPO, انواع POM نیازی به پخت ندارند?
در فرآیند قالب گیری تزریقی, the moisture content of the material must be in a relatively low range to ensure the normal injection molding and the normal physical properties of the product material. The moisture content of the injection material is too high. اولین, the surface will appear bad appearance such as silver wire. دومین, the water vapor in the material will cause bubbles and holes in the product, which affects the strength. سوم, the most important thing is that the high water content will cause the material to decompose when it melts.

از این رو, the material must be dried before injection. در moisture absorption rate of ABS, کامپیوتر, PA6, PA66 and other materials is relatively large. The direct injection molding of the original packaging is not a big problem, but tens of kilograms of materials in the barrel cannot be done all at once. , In the process of several hours to ten hours, the moisture in the air will be absorbed by the material. با این حال, PP, TPE, and POM have relatively low moisture absorption rates, and they will absorb less moisture for a long time under ambient temperature and humidity. The moisture absorbed can be within the allowable range of the دستگاه قالب گیری تزریقی working process and has little effect on قالب گیری تزریقی.
البته, a small impact does not mean that there is no impact, because although it does not absorb much moisture, it still absorbs water after all. In mass production, it is best to turn on the dryer for the stability of product quality when it has been produced continuously for many days.

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