Common plastic molding applications – Turned Parts – Machined Parts
ABS acrylonitrile – butadiene – styrene copolymer
Application:
Automotive (dashboard, door tools, wheel covers, mirror housings, etc.), refrigerators, high-intensity tools (hair dryers, blenders, food processing machine, mowers, etc.), phone case, a typewriter keyboard and recreational vehicles such as golf carts and jet skis cars.
Injection molding process conditions:
Drying: ABS material with moisture absorption, require drying before processing. Recommended drying conditions for at least 80 ~ 90 drying under 2 hours. Material temperature should be guaranteed less than 0.1%.
Melting temperature: 210 ~ 280 ; recommended temperature: 245 .
Mold temperature: 25 … 70 . (Die temperature will affect the finish of plastic parts, while lower temperatures lead to finish lower).
Injection pressure: 500 ~ 1000bar.
Injection speed: in high speed.
Chemical and physical properties:
ABS is acrylonitrile, butadiene and styrene three monomers. Each of the monomers with different properties: acrylonitrile have high strength, thermal stability and chemical stability; butadiene with the toughness and impact resistance characteristics of styrene; processing, high gloss, and strength. From the morphological point of view, ABS is an amorphous material.
Polymerization of three monomers had a two-phase ternary copolymer, a styrene – acrylonitrile in the continuous phase of polybutadiene rubber dispersed phase. ABS depends on the characteristics of the ratio of monomers and the molecular structure of two phases. This can be in product design with great flexibility, and the resulting market hundreds of different quality ABS material. These different quality materials offer different characteristics, such as moderate to high impact resistance, from low to high finish and high heat distortion.
ABS material offers superior workability, appearance, low creep and excellent dimensional stability and high impact strength.
PA12 Polyamide 12 or nylon 12
Application:
Water table and other business equipment, cable sets, mechanical cam, sliding mechanisms, and bearings.
Injection molding process conditions:
Drying: Before processing should ensure that humidity below 0.1%. If the material is exposed to the air storage, it is recommended to be at 85 hot air dry 4 to 5 hours. If the material is stored in a sealed container, then the balance after 3 hours the temperature can be used directly.
Melting temperature: 240 ~ 300 ; for common characteristics of materials should not exceed 310 , fire-retardant properties for a material should not exceed 270 .
Mold temperature: for non-enhanced material 30 ~ 40 , the thin wall or large area of components for the 80 ~ 90 , for enhanced materials 90 ~ 100 . Increase in temperature will increase the material's crystallinity. Precise control of mold temperature on the PA12 is very important.
Injection pressure: maximum to 1000bar (recommended minimal needs pressure and high pressure melting temperature).
Injection speed: high-speed (for a glass additive material better).
Channel and gate:
The material is not additive, since the lower viscosity material, flow channel diameter should be about 30mm. Material required for the enhanced the crowd Road 5 ~ 8mm diameter. Flow should be all for the circular shape. Note the entrance should be as short as possible. You can use various forms of the gate. Do not use a large plastic small gate, which is on the plastic parts in order to avoid excessive pressure or excessive shrinkage. Gate thickness equal to the best thickness of plastic parts. If you use a submerged gate, the proposed minimum diameter of 0.8mm.
Hot runner mold is very effective, but requires very precise temperature control to prevent material leakage or freezing in the nozzle. If you use the hot runner, gate size should be smaller than the cold runner.
PA6 Polyamide 6 or nylon 6
Application:
Because of good mechanical strength and stiffness are widely used for structural components. Because of good wear characteristics, but also for the manufacture of bearings.
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