pa12 granule Description
refore, PA12 must be dried before extrusion. drying conditions are as follows: a well-ventilated drying oven (or drying oven) with a temperature of 80±5°C (more than 110°C will cause oxidative discoloration of pa12 granule). 2 ~ 5h. 1.2 basic parameters of extruder are due to inherent characteristics of pa12 granule, which do not have obvious "three-state" characteristics of general plastics - glassy, highly elastic and viscous, ie only obvious glassy and viscous flow, and When temperature exceeds required value of extrusion process, melt is liquid and cannot be extruded, that is, range of practical extrusion temperatures is narrow. Secondly, even if a common type of extruder is used, re are certain requirements for size of extruder screw and its spacing from barrel. For example, for common type φ120, φ150 extruders, following basic parameters should be available: screw feeding area should be slightly longer, length-to-diameter ratio of screw is (20-25):1, screw groove of extrusion part is shallow, compression ratio is about 3.5:1, and gap distance between screw and barrel is not more than 0.15 mm. 1.3 Effect of Extrusion Temperature and Selection extrusion temperature range of pa12 granule is sufficiently rich compared to or nylon materials, but narrower than or plastics such as polyethylene and polyvinyl chloride. Although it has only a distinct glassy and viscous flow state, gradual softening of plastic occurs at specific temperature conditions, which is key to extrusion. It has a distinct melting point and requires a higher extrusion temperature, typically 220 to 250 °C. When temperature of compression section is set too high, it will not only cause bad defects such as scorch, but also cause pa12 granule to be liquid and cannot be extruded. When extrusion temperature is too low, pa12 granule material will condense sharply, and mold will be blocked, and mold will be hung. Dead or damaged screw.
pa12 granule show
pa12 granule properties
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