ABS, the raw material of LED injection molding module, is one of the five major synthetic resins. It has excellent impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties. , It is easy to paint and color, and it can also perform secondary processing such as surface metallization, electroplating, welding, hot pressing and bonding. It is widely used in machinery, automobiles, electronic appliances, instruments, textiles and construction and other industrial fields. An extremely versatile engineering thermoplastic. Acrylonitrile-butadiene-styrene copolymer is a terpolymer composed of acrylonitrile, butadiene and styrene. The raw material ABS of LED injection molding module is usually light yellow or milky white granular amorphous resin. ABS, the raw material of LED injection molding module, is one of the most widely used non-universal plastics.

The following is a detailed introduction to the ABS molding process specification for the raw material of LED injection molding module.

1. Injection temperature: including barrel temperature (which can be divided into rear, middle and front sections), nozzle temperature and mold temperature. Although the melt viscosity of ABS, the raw material of LED injection molding module, is not significantly affected by temperature as much as the injection pressure, it is beneficial for the mold of thin-walled products under the condition of high temperature. The decomposition temperature of ABS, the raw material of LED injection molding module, is theoretically higher than 270t: above, but in the actual injection molding process, due to the influence of time and other process conditions, the resin often begins to change color at around 2501. At the same time, the raw material of LED injection molding module The rubber phase contained in ABS is also not suitable for high temperature, otherwise it will affect the performance of the product. The molding temperature of ABS, the raw material of LED injection molding module, requires a slightly higher temperature (210-2501) for heat-resistant and electroplating-grade resins to improve the difficulty of melt filling or to facilitate electroplating performance. ABS resins such as grades, flame-retardant grades, and impact-resistant grades all prefer lower temperatures to prevent decomposition or adverse physical and mechanical properties. The temperature selected by the plug injection machine is slightly higher than that of the screw injection machine. For general products, the temperature range of the plunger type is between 180 and 2301, while the screw injection machine can be molded at 160 to 220X. In the molding process, the general barrel temperature (150-1701C in the rear, 170-180" in the middle, 180-210C in the front). The temperature of the nozzle is generally 170-180C, and special attention is paid to the temperature of the homogenization section and the nozzle. Any change will be reflected on the product, causing defects such as flashing, silver wire, discoloration, poor gloss, and obvious weld lines.

2. Mold temperature: The mold temperature plays an important role in the surface roughness of the ABS product, the raw material of the LED injection molding module, and reducing the internal stress of the product. The mold temperature is high, the melt is easy to fill the mold, the appearance of the product is good, the internal stress is small, and the electroplating of the product is also improved or improved. Later variants, etc. For products with general requirements, the mold temperature can be controlled at 40-50X:; for products with high appearance and performance requirements, the mold temperature can be controlled at 60-70C. Moreover, the mold temperature should be uniform, and the temperature difference between the mold cavity and the mold core should not exceed 10. For deep-hole products or products with complex shapes, the mold cavity temperature is required to be slightly higher than the mold core temperature to facilitate the smooth release of the product. mold.

3. Injection pressure: Compared with polyethylene, polystyrene, nylon and other plastics, the fluidity of ABS, the raw material of LED injection molding module, is slightly worse, so the required injection pressure is larger. However, excessive injection pressure is likely to cause difficulty in demolding or damage to the product, and may also bring greater internal stress to the product. The injection pressure of ABS, the raw material of LED injection molding module, is not only related to the wall thickness of the product, the type of equipment, etc., but also to the grade of the resin. For thin-walled, long-flow, small-gate products, the required injection pressure is higher, up to 130-150MPa, while thick-walled and large-gate products 15·#70—100MPa is sufficient. In the actual production process, the injection pressure of the screw injection machine is usually below 100MPa (we use 50-70MPa), while the plunger injection machine is generally above 100MPa. The holding pressure should not be too high. The screw type injection machine generally uses 30-50MPa, while the plunger type needs more than 60-70MPa. If the holding pressure is too high, the internal stress of the product will increase.

4. Injection speed. The injection speed has a certain effect on the change of the fluidity of the raw material ABS culture body of the LED injection molding module. If the injection speed is slow, the appearance of the product will appear ripples and poor welding. If the injection speed is fast, the mold can be filled quickly, but it is easy to Poor exhaust, poor apparent roughness, etc., will also reduce the tensile strength and elongation of the product, and reduce the adhesion of the coating due to the excessive injection speed. For this reason, in the production process, in addition to the difficulty of filling the mold, it is necessary to use a higher injection speed, and it is generally appropriate to use a medium or low degree of continuity.