The main production process of mobile phone protection shell

　　1 barrel temperature. Selection and TPU barrel temperature related to the hardness of. The TPU melting temperature and high hardness high, the highest temperature of the barrel at the end of the high. Processing TPU material cylindertemperature range is the range of 177~232 DEG C. Distribution of barrel temperature is generally from the side of the hopper (Hou Duan) to the nozzle(front), gradually increased, so that the TPU temperature rose steadily to reach the purpose of uniform plasticizing.

　　2 nozzle temperature. Nozzle temperature is slightly lower than the highest temperature of barrel, in order to prevent the molten material in salivationphenomenon may occur through type nozzle. If to prevent salivation and adopt self-locking nozzle, nozzle temperature can be controlled in the highest temperature range feed tube.

　　3 mold temperature. Mold temperature on the intrinsic properties of TPU productsand great influence on the apparent quality. The crystallinity and products itdepends on many factors such as the size of TPU. The mold temperature is usuallyconstant temperature by cooling medium such as water control, TPU of high hardness, high crystallinity, high mold temperature. For example, Texin, hardness 480A, mold temperature of 20 to 30 DEG C; hardness of 591A, mold temperature 30 to 50 DEG C; hardness of 355D, mold temperature 40 to 65 DEG C. TPUproducts mold temperature is in commonly 10 ~ 60 DEG C. Low mold temperature,melt premature freezing caused streamline, and not conducive to the growth of spherulites, make the products with lower crystallinity, will appear latercrystallization process, which caused the changes after shrinkage and performanceproducts. .