各种塑料加工工艺以及性能(二)（A variety of plastic processing technology and performance (two)）.docVIP

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2017-07-24 发布于河南
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各种塑料加工工艺以及性能(二)（A variety of plastic processing technology and performance (two)）.doc

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各种塑料加工工艺以及性能(二)（A variety of plastic processing technology and performance (two)）

各种塑料加工工艺以及性能(二)（A variety of plastic processing technology and performance (two)） A variety of plastic processing and performance (two).Txt - you pedal both boats, you row really beautiful. Every man who says he doesnt want to be in love has an impossible man in his heart. I love every unhappy but still laughing child. (there is no one, see through me, invisible, know Im waiting for someone). PA12 polyamide 12 or nylon 12 typical range of application: water meter and other commercial equipment, cable sleeve, mechanical cam, sliding mechanism and bearings. Injection molding process conditions: drying treatment: before processing should ensure that humidity is below 0.1%. If the material is exposed to air storage, it is recommended to dry in 85C hot air for 4~5 hours. If the material is stored in an airtight container, it can be used directly after 3 hours of temperature balance. Melting temperature: 240~300C; for ordinary characteristics of materials should not exceed 310C; for flame retardant properties of materials, not more than 270C. Mold temperature: for unreinforced materials, 30~40C, for thin-walled or large-area components of 80~90C, for reinforced materials 90~100C. Increasing the temperature will increase the crystallinity of the material. It is important for PA12 to accurately control the mold temperature. Injection pressure: maximum to 1000bar (recommended minimum pressure and high melting temperature). Injection speed: high speed (for materials with glass additives) better. Runner and gate: for materials without additives, the runner diameter shall be about 3mm due to low viscosity of the material. For reinforced materials, large channel diameters of 5~8mm are required. The shape of the runner shall be all round. The injection should be as short as possible. Multiple gates may be used. Large plastic parts do not use small gate, which is to avoid excessive pressure or excessive shrinkage of the plastic parts. The gate thickness is best equal to the plasti