N93 mobile phone face shell products are shown in Figure 1. The maximum external dimension of the product is 96.93 mm x 48.06 mm x 8.56 mm; The average thickness of plastic parts is 1.15mm, the material of plastic parts is PC+ABS, the shrinkage rate is 1.004, and the mass of plastic parts is 4.46g. The technical requirements of plastic parts are that there shall be no peeling, injection molding dissatisfaction, flow pattern, porosity, warpage deformation, silver pattern, cold material, jet pattern and other defects, and meet the requirements of ROSH environmental protection.
Mobile phone shell material is generally high performance PC+ABS, there are also PC production, but ABS production of mobile phone shell is rarely used. PC+ABS is a blend of PC plastic raw materials and ABS plastic raw materials, which can integrate the excellent properties of PC and ABS. On the one hand, it can improve the heat resistance, impact resistance and tensile strength of ABS. On the other hand, it can reduce the viscosity of PC melt, increase the fluidity during injection molding, and reduce the sensitivity of internal stress and impact strength to the thickness of plastic parts. Therefore, PC+ABS is widely used in mobile phone cases. The density of PC+ABS is 1.18g/cm3, the glass transition temperature is 130℃, and the melting temperature is 230℃ ~ 270℃. PC+ABC has high strength, rigidity, good heat resistance, excellent dimensional stability, good light stability, low molding shrinkage rate, good molding performance, The dimensional stability of plastic parts made of PC + ABS raw materials is relatively high. Due to the high content of PC contained in PC+ABS, the fluidity is not very good, and the injection molding parts with thin wall and complex shell are generally prone to brittle cracking or fracture
The reason for choosing the simplified fine water orifice mold frame is that it can facilitate the design of pouring system. The three-plate die is designed through the fine water orifice die frame, and the multi-point glue feeding can be designed for the precision die. In addition, compared with the thin water mouth die frame, the simplified thin water mouth die frame can provide sufficient space for the design of large slider due to the lack of four guide posts.
Mobile phone shell material is generally high performance PC+ABS, there are also PC production, but ABS production of mobile phone shell is rarely used. PC+ABS is a blend of PC plastic raw materials and ABS plastic raw materials, which can integrate the excellent properties of PC and ABS. On the one hand, it can improve the heat resistance, impact resistance and tensile strength of ABS. On the other hand, it can reduce the viscosity of PC melt, increase the fluidity during injection molding, and reduce the sensitivity of internal stress and impact strength to the thickness of plastic parts. Therefore, PC+ABS is widely used in mobile phone cases. The density of PC+ABS is 1.18g/cm3, the glass transition temperature is 130℃, and the melting temperature is 230℃ ~ 270℃. PC+ABC has high strength, rigidity, good heat resistance, excellent dimensional stability, good light stability, low molding shrinkage rate, good molding performance, The dimensional stability of plastic parts made of PC + ABS raw materials is relatively high. Due to the high content of PC contained in PC+ABS, the fluidity is not very good, and the injection molding parts with thin wall and complex shell are generally prone to brittle cracking or fracture
The reason for choosing the simplified fine water orifice mold frame is that it can facilitate the design of pouring system. The three-plate die is designed through the fine water orifice die frame, and the multi-point glue feeding can be designed for the precision die. In addition, compared with the thin water mouth die frame, the simplified thin water mouth die frame can provide sufficient space for the design of large slider due to the lack of four guide posts.
Plastic injection mold is widely used in many industries, such as: automotive, home appliances, daily commodity, medical consumables, home and garden tools, Light housing, electronic components, beauty and personal care, toys.