The reason of adding cooling device in the feed section of extruder

In order to ensure that plastics can always melt within the temperature range required by its processing technology, a heating and cooling system must be installed on the extruder. In the process of extrusion, internal and external heat act on the material at the same time, which leads to the high temperature of the material in the barrel, sometimes even exceeding the temperature required for plastic plasticization. In order to avoid the decomposition of materials due to overheating and make the molding process go smoothly, a cooling system must be set up.

Extruder is a kind of production equipment which uses high temperature and high pressure to melt the plastic refractory in a heater, then extrudes the plastic from the die on the machine by the power of screw rotation, and finally forms the required shape by cooling.

Plastic extruders can be basically divided into twin-screw extruders, single-screw extruders, rare multi-screw extruders and screwless extruders. According to the angle between the direction of material flow and the center line of the screw, the extruder head can be divided into right-angle head and inclined head.

The basic components of extruder include screw, gear reducer, heater, cooler, extrusion head and die. The working temperature of extruder is usually 190℃ to 260℃, which requires effective cooling of extruder.

In order to protect the transmission box of twin-screw extruder, the following must be done:

1, change the lubricating oil 500 hours after the first use.

2. The extruder is lubricated with original medium-pressure gear oil, and the brand number is 150.

3. During normal operation, the oil level is not lower than the center line of the oil standard, and it is lower than the center line. Please replenish it as soon as possible.

4. Change the oil every 3000 hours in the future.

5. When changing oil, clean the oil tank and oil filter. Find out the lubricating oil used this time, then put the clean lubricating oil on the oil tank to clean it, then loosen it and install new lubricating oil.

6. Clean the lubricating oil filter regularly every month during normal use and weekly during the running-in period. Cleaning method: find the oil filter, open it and take out the dirt.