Daily operation precautions of various sheet extruders

Sheet extruder is used to extrude molten plastics through a fixed shape extrusion under the action of screw and cut after water cooling setting under the action of tractor. It is mainly used in the continuous production of a large number of holding extruders for products with the same cross section, such as pipe bar, foreign material, etc. It can also be used in plastic modified granulation. The basic mechanism of extrusion is simple-one. The screw rotates in the cylinder and pushes the plastic forward.

It can be divided into single screw extruder and twin screw extruder. For many people who don't know about extruders, the operation of extruders is very mysterious, and many people who have or are using extruders don't understand the correct operation rules of extruders. Today I'm here to talk about the matters needing attention in the use of extruders. In the use of extruder, the operator should pay attention to the matters needing attention: the extruder operator should memorize the operation requirements and operation sequence in the instructions for the use of extruder. Before starting, check whether the bolts and nuts in the connecting parts of the equipment are firm, whether the lubricating parts are adequately lubricated, and whether the amount of lubricating oil in the oil tank is within the specified oil level index. Check whether the hopper is clean and free of foreign bodies.

The screw is actually a slope or slope, wound around the central layer. The aim is to increase pressure in order to overcome greater resistance. As far as an extruder is concerned, there are three kinds of resistance to be overcome: the friction force between solid particle feed and cylinder wall and the mutual friction force between them in the feed zone during the first few turns of screw rotation; the adhesion force of melt on cylinder wall; and the internal logistics resistance of melt when it is pushed forward.

Check whether the raw material meets the quality requirements; if the raw material is qualified, add the material to the hopper until it is full. Verify whether the screw structure meets the production process requirements. After confirming that the barrel is clean and free of any foreign matter, filter screen, shunt plate and moulding die are installed. Adjust the temperature of the automatic control instrument on the control box according to the requirements of raw material plasticizing process.

The heating system is started and the barrel and die are heated. When the required temperature is reached, constant heating is over 1.5 hours to ensure uniform temperature in all parts. The V-belt pulley part of manual travelling car should rotate flexibly, easily and without blockage. Start the lubricating oil pump and check whether the lubricating oil pipeline is smooth and the position of lubricating oil supply is accurate. Extruder is a common plastic machinery equipment. In the process of daily operation of extruder, various kinds of faults occur in the extruder, which affects the normal production of plastic machinery. We must learn to maintain the extruder regularly in order to prolong its service life and improve production efficiency.