Typical application range:
Water gauges and other trading equipment, cable jackets, mechanical cams, sliding mechanisms and bearings.
Injection molding process conditions:
Drying treatment: The humidity should be below 0.1% before processing. If the material is stored in the air, it is recommended to dry in 85C hot air for 4 to 5 hours. If the material is stored in a closed container, it can be used directly after 3 hours of temperature equilibration.
Melting temperature: 240~300C; do not exceed 310C for ordinary characteristic materials, and do not exceed 270C for materials with flame retardant properties.
Mold temperature: 30~40C for unreinforced materials, 80~90C for thin-walled or large-area components, and reinforced materials for reinforced materials
90~100C. Increasing the temperature will increase the crystallinity of the material. Precise control of mold temperature is important for the Pa12.
Injection pressure: up to 1000 bar (low holding pressure and high melting temperature are recommended).
Injection speed: high speed (better for materials with glass additives).
Runners and gates:
For materials without additives, the flow path diameter should be about 30mm due to the low viscosity of the material. A large flow path diameter of 5 to 8 mm is required for the reinforced material. The shape of the runner should be all round. Note that imports should be as short as possible. Various forms of gates can be used. Do not use small gates for large plastic parts. This is to avoid excessive pressure or excessive shrinkage of the plastic parts. The gate thickness is preferably equal to the thickness of the plastic part. If a submerged gate is used, the recommended minimum diameter is 0.8mm.
Hot runner molds are very effective, but require precise temperature control to prevent material from leaking or solidifying at the nozzle. If a hot runner is used, the gate size should be smaller than the cold runner.
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