pa 12 polyamide Description
refore, it is better to use a cold feed extruder with a relatively long diameter. Conducive to uniform mixing of plastic materials. fuselage has four heating zones, heating process is moderated, material temperature rises evenly, which is conducive to stability of continuous extrusion. machine head has two heating zones, which are controlled by rmocouple to uniformly heat up. temperature of each part of extruder and screw speed have a great influence on quality stability of pa 12 polyamide pipe. Table 1 shows effect of different temperatures in various zones of extruder on processability of extruded pa 12 polyamidepipe. It can be seen from Table 1 that temperatures of 3# and 4# tests are lower and extrusion processability is poor. reason is that after temperature reaches melting point of pa 12 polyamide, shearing effect is poor, resulting in poor fluidity, resulting in surface quality of pipe. Not good; and 1# test temperature is too high, resulting in a reduction in system pressure per unit time, increased extrusion volume, tube size is not easy to set; only 2# test temperature is suitable, pipe size is stable, appearance is good. main factors affecting extruder extrusion amount are screw rotation speed, feed speed and temperature of each zone of extruder. temperature control device can be used to control temperature of fuselage and machine head according to process requirements. Table 2 shows effect of different screw speeds of extruder on processability of extruded pa 12 polyamide pipe. It can be seen from Table 2 that when screw speed is 140-180 r/min, traction is difficult, pipe size is unstable or stability is poor, and printing is not clear. process is best when screw speed is 120r/min. For synsis of Table 1 and Table 2, process conditions of optimized extruded pa 12 polyamide pipe are shown in Table 3. In order to ensure stability of outer diameter of pipe and prevent unevenness of local pile and pipe diameter, tractor and drying device are arranged.
pa 12 polyamide show
pa 12 polyamide properties
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