Operation and maintenance of plastic granulator die

In general, plastic granulator die is a valuable, high-precision component on the extrusion line that requires a lot of maintenance in addition to careful handling. In order to prevent the die from malfunctioning due to the failure of the die, it must be operated correctly and protective measures should be taken to ensure that the die is ready for use. Wrong mistakes, especially carelessness or mishandling during maintenance, cleaning or conditioning, are the main cause of die damage, so all personnel who come into contact with the die must be rigorously trained. The operator must thoroughly understand the function of the die, know the temperature change, the effect of the adjustment of the die hole or the adjustment bar on the quality of the product, and pay attention to the source of the fault. The operator also needs to understand the importance of maintaining good contact between the heater and the die. It is possible to judge whether there is a fault on the production line. Where is the fault? For example, when the plastic granulator is extruded and pulsating, the flow block of the slit die cannot be constantly adjusted (generally the device is not designed for this purpose). He must also be able to judge whether the limit is exceeded based on the measurement of the inlet pressure. Also note that the die or choke block cannot be adjusted quickly, but should be moderately changed in adjacent areas, otherwise the bolts and chokes may be damaged.

Also note that the squeegee that can only be made of soft materials (copper, brass, soft ly) removes the melt from the die to avoid scratching the mold, and the die gap width of the die is also measured using a soft material such as a brass gauge. . Even the slightest scratches can cause streaks on the extrudate, reducing product quality. This is often the case when it is necessary to change the die frequently, especially in film and sheet extrusion. It must be handled by a person who has the structure and function of the die and has detailed instructions on hand (drawings, equipment descriptions, parts) Single) It is best to have experience in disassembling, inspecting, and installing new dies before use. The disassembly, cleaning, repair and maintenance of the die should be carried out at the designated place. The place should be away from the production site. Pay attention to the cleaning and padding with corrugated plates. When using the small crane, the chain of the pulley block will often be used when lifting by hand. Damage to the die. To avoid this danger, consider using twine. The work site should also have a variety of tools (screwdrivers, torque, wrenches), soft shovel (bronze, copper, soft Lu), cleaning and polishing materials, and if possible, a die preheater, which can greatly shorten the replacement of the mold The time of the head. It is also necessary to check the heater. This preheater should be equipped with a number of heating wires and control systems. It is not necessary to separately control each die heater at this time, but this depends on the size of the die. If the die needs to be thoroughly cleaned, the main bolt of the die must be loosened, but it does not need to be removed. The die is still connected to the plastic granulator，just loosen the flow path.