Characteristics and molding process of the hottest

2022-08-23
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Various plastic properties and molding process

PA12 polyamide 12 or nylon 12

chemical and physical properties

PA12 is a linear, semi crystalline crystalline thermoplastic material from butadiene. Its characteristics are similar to those of PA11, but its crystal structure is different

pa12 is a good electrical insulator and, like other polyamides, will not affect the insulation performance due to humidity. It has a very good red ldquo; Skin rdquo; The 6-axis robot officially unveiled its impact resistance and mechanochemical stability at Nangang. PA12 has many improved varieties in plasticizing and reinforcing properties. Compared with PA6 and PA66, these materials have lower melting point and density, and have very high moisture regain. PA12 has no resistance to strong oxidizing acids

pa12 viscosity mainly depends on humidity, temperature and storage time. It has good liquidity. The shrinkage is between 0.5% and 2%, which mainly depends on the material type, wall thickness and other process conditions

2. Brief electric pull injection mold process conditions

drying treatment: before processing, ensure that the humidity is below 0.1%. If the material is stored exposed to air, it is recommended to dry it in hot air at 85C for 4-5 hours. If the material is stored in a closed container, it can be used directly after 3 hours of temperature balance

melting temperature: 240~300c; For materials with ordinary characteristics, it should not exceed 310c, and for materials with flame retardant characteristics, it should not exceed 270C

mold temperature: 30~40c for unreinforced materials, 80~90c for thin-walled or large-area components, and 90~100c for reinforced materials for some products, although not high-end. Increasing the temperature will increase the crystallinity of the material. It is very important for PA12 to accurately control the mold temperature

injection pressure: up to 1000bar (low holding pressure and high melting temperature are recommended)

injection speed: high speed (better for materials with glass additives)

runner and gate: for materials without additives, the runner diameter should be about 30mm due to the low viscosity of the material. For reinforced materials, a large runner diameter of 5~8mm is required. The runner shape should be all round. The injection port should be as short as possible. Various forms of gates can be used. Don't use a small gate for large plastic parts. This is to avoid excessive pressure on plastic parts or excessive shrinkage after any two affirmation. The thickness of gate should be equal to that of plastic parts. If a submerged gate is used, a minimum diameter of 0.8mm is recommended

hot runner mold is very effective, but it requires precise temperature control to prevent material leakage or solidification at the nozzle. If hot runner is used, the gate size should be smaller than that of cold runner

typical uses

water meters and other commercial equipment, cable sleeves, mechanical cams, sliding mechanisms, bearings, etc

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