1. Ensure the normal temperature
Before starting the extruder, check whether the temperature control is sensitive, whether the instrument fails and whether the cooling water path is smooth. Generally, thermometers, cooling water and other methods are used for detection. Heat the screw, barrel and die head of the extruder according to the operating procedures of the extruder. After the temperature rises to the set temperature, the extruder can be started up only after holding for a few minutes, so that the temperature of each part of the machine tends to be stable.
2. To prevent overload
Before starting the machine, the connecting screws and bolts of each part of the die head must be tightened while hot. Before the material is not extruded, the operator should not stand in the front of the die to prevent the bolt or screw from breaking and causing injury accidents. When the heat resistant and wear-resistant extruder starts to extrude, the screw speed should be slow, and then it should be gradually accelerated, so as to prevent damage to the parts due to overload during start-up. When the extruder is started up, a small amount of materials should be added first and the feeding balance should be maintained. Pay close attention to the torque and other table values when feeding. After the materials are extruded from the die head and the traction equipment is pulled, the material quantity can be increased gradually until the normal extrusion.
3. Reasonably cover the cover plate
Started pulling stock mould and die head should have a certain distance to traction, open the water (water can not be poured into the die head, otherwise it will cause the die discharging disorder caused by cutting or die snarl-up), complicated shape, smaller cavity and more than a mold cavity profile should open cover plate of stock mould, after plasticizing normal extrusion materials, material has led to the traction machine through setting good traction rope. Shorten the distance between the molding table and the die head, cover the cover plate, and start the vacuum pump. When the extrusion speed and traction speed are basically balanced, the distance between the molding table and the die head will be reduced to the ideal value after observing the normal extrusion of the profile.
In the process of using extruder, we must pay more attention to its temperature and noise, check if extruder spare parts is complete, in principle, it won't produce this kind of noise, which is hard for people to accept, In the case of the exclusion of environmental interference, if there is greatly the vibration of the machine, the equipment should be doubted whether the material removal is not complete, at the same time, various functional areas should be checked to make sure their normal operation.
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