Shan Zhong (talk | contribs) |
Shan Zhong (talk | contribs) |
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=='''Driving Session'''== | =='''Driving Session'''== | ||
:*The two main purposes for driving system are to deliver plastic and compress plastic. | |||
:*To reduce the degradation of the plastic during recycling, it is necessary to decrease the residential time for plastic in the heating tube. It is better to use long heating tube and rather high auger speed, which can decrease the residential time and make the plastic be heated more consistently. The normal screw rotation speed is 45-210 rpm (Cook et al., 1996; Chengcheng et al., 2015; Awaja et al., 2004; Oromiehie et al., 2004). | |||
:*If the size of the auger on the nozzle end is slight bigger than other parts, it’s better for the auger to compress the plastic in the tube. | |||
=='''Feeding Session'''== | =='''Feeding Session'''== | ||
=='''Chain Extender'''== | =='''Chain Extender'''== | ||
=='''Reference'''== | =='''Reference'''== | ||
Revision as of 21:55, 4 June 2017
Heating Session
- Three heating sessions with varied temperature is helpful. Three heating sessions can be obtained by changing the coil density.
- Heating session-2 is in the middle of the heating tube. The temperature on the session-2 should be at a point where the plastic can be totally melted in the session-2.
- Heating session-1 is on the feeding side and heating session-3 is on the extrusion side. The temperatures on session-1 and session-3 should be slightly lower than that on session-2 (Pettit, 1973). Heating session-1 is for pre-heating the plastic. Plastic after heating session-3 should have enough viscosity to form filament, and the viscosity is varied with temperature for the same plastic.
- The temperature on nozzle should be close to the temperature on heating session-3. It is important to keep the nozzle with a stable temperature because nozzle is easy to lose heat.
Driving Session
- The two main purposes for driving system are to deliver plastic and compress plastic.
- To reduce the degradation of the plastic during recycling, it is necessary to decrease the residential time for plastic in the heating tube. It is better to use long heating tube and rather high auger speed, which can decrease the residential time and make the plastic be heated more consistently. The normal screw rotation speed is 45-210 rpm (Cook et al., 1996; Chengcheng et al., 2015; Awaja et al., 2004; Oromiehie et al., 2004).
- If the size of the auger on the nozzle end is slight bigger than other parts, it’s better for the auger to compress the plastic in the tube.