The screw tail fracture is generally the screw preheating problem, especially the screw core preheating is not in place in other words is that the screw did not reach the ideal working temperature, open the cold car (the cold is said that there is no insulation in place), so fracture.
In general, it is generally said that the temperature of the thermostat of the injection machine will reach the temperature you need. Generally speaking, the temperature of the temperature control meter of the injection molding machine reaches the temperature you need in the early stage of heating. Generally speaking, the core of the screw is usually cold or warm. You often ignore this problem, in fact, your screw is not broken when you found, as early as you had a crack in the previous period, for a long time do not pay attention to use will be broken.
It is also possible that the intake of iron or other things to enter the screw break, this is a good inference that the screw down the screw down to see the screw is damaged, there is no trace inside the barrel. Such a situation can be avoided in the early stage by placing a magnetic rack in the hopper of the injection molding machine to prevent metal foreign matter from falling into the screw.
In particular, the fracture of the lower screw under normal service condition will not occur. Generally speaking, the factors leading to the fracture of the screw are the above two points. The size of the plastic material and the particle size of the recycled waste and the factor of breaking screw will not be very large. Of course this is back to the front problem. The temperature of the inlet of your screw is too low and the heat preservation time is not reached. Even if the temperature control meter reaches the temperature, it is also a false phase. The material will take the screw and the heat of the barrel after entering the inlet. Torque and double pressure increase screw fracture.
