1, just start the flange temperature and the temperature of the head immediately adjacent to the flange to be 5 ℃ higher. Also can be properly heated with a torch to facilitate heat transfer.To be the temperature of each section to reach the specified value to be maintained for more than 15min before extrusion. Stable and then lower the temperature to the set temperature.
2, Speed control: the host speed should not be too fast when the nylon sheath is just started; 90 extruder, the host speed of discharge should not exceed 30RPM; 150 extruder, the host speed of discharge should not exceed 10RPM; the speed can be gradually increased after the nylon sheath is out of the mold.
3, Water tank control requirements: the production of nylon sheath section 1 water tank must use warm water cooling, water tank temperature to ensure greater than 60 ℃, warm water tank length of not less than 3 meters.
3, Core deviation control requirement: the core deviation of nylon sheath should not exceed 25% when extruding nylon sheath.
4, outer sheath extrusion requirements
4.1 When extruding the outer sheath, use a torch to pre-bake the surface of the nylon sheath that is about to be released (not yet released) when the nylon core is released on the discharge tray to ensure that the nylon sheath remains flat and wrinkle-free after it is put flat.
4.2 Do not use vacuum device when extruding.