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PVC transparent hose production process
2021-08-21
1. Kneading the ingredients
Weigh various raw materials accurately and put them into the kneader in a certain order. The feeding sequence is: PVC resin, plasticizer, stabilizer, lubricant. When the temperature reaches 100~110℃, the material can be discharged.
2. Extrusion granulation
The temperature should be controlled well in this process, and the highest point of the material temperature should be controlled higher than the melting temperature of the material and lower than the extrusion temperature, that is, between 155~160℃. Granulation should achieve the purpose of full mixing and preliminary plasticization.
The temperature of each zone of the granulator is as follows:
The first zone is 80~90℃; the second zone is 130~140℃; the third zone is 140~150℃; the nose is 150~160℃.
Three, extrusion tube forming
The temperature of extrusion tube molding is slightly higher. Generally speaking, the transparency of the tube is related to the molding temperature. Within a certain temperature range, high temperature transparency is good, and vice versa. At the same time, the traction speed and cooling speed will affect the transparency of the pipe. The drawing speed is slightly higher, the cooling speed is fast, and the transparency of the pipe is better. The pulling speed is generally 10%~15% faster than the extrusion speed; the cooling of the transparent hose is first sprayed with cold water at the die of the machine head, and then enters the water tank for cooling.
The temperature of each zone of the extrusion tube is as follows:
Zone 1 is 90±5°C; Zone 2 is 140±5°C; Zone 3 is 160±5°C; Zone 4 is 170±5°C.
Four, PVC hose extrusion precautions:
1. When directly extruding with powder, the temperature of the extruder is about 5℃ lower than that of pellets.
2. In addition to the smaller diameter (below φ60mm) tube blanks that do not need to be blown in for cooling and shaping, compressed air must be blown into the tube when the larger diameter tube blanks are cooled to ensure the accuracy and stability of the tube diameter. . Note that the compressed air pressure should be stable.
3. Pay attention to the stability of the traction speed to avoid changes in pipe diameter or pipe wall thickness due to unstable traction.
4. If the machine is shut down for a long time, the machine must be disassembled and cleaned to avoid decomposition problems.
Weigh various raw materials accurately and put them into the kneader in a certain order. The feeding sequence is: PVC resin, plasticizer, stabilizer, lubricant. When the temperature reaches 100~110℃, the material can be discharged.
2. Extrusion granulation
The temperature should be controlled well in this process, and the highest point of the material temperature should be controlled higher than the melting temperature of the material and lower than the extrusion temperature, that is, between 155~160℃. Granulation should achieve the purpose of full mixing and preliminary plasticization.
The temperature of each zone of the granulator is as follows:
The first zone is 80~90℃; the second zone is 130~140℃; the third zone is 140~150℃; the nose is 150~160℃.
Three, extrusion tube forming
The temperature of extrusion tube molding is slightly higher. Generally speaking, the transparency of the tube is related to the molding temperature. Within a certain temperature range, high temperature transparency is good, and vice versa. At the same time, the traction speed and cooling speed will affect the transparency of the pipe. The drawing speed is slightly higher, the cooling speed is fast, and the transparency of the pipe is better. The pulling speed is generally 10%~15% faster than the extrusion speed; the cooling of the transparent hose is first sprayed with cold water at the die of the machine head, and then enters the water tank for cooling.
The temperature of each zone of the extrusion tube is as follows:
Zone 1 is 90±5°C; Zone 2 is 140±5°C; Zone 3 is 160±5°C; Zone 4 is 170±5°C.
Four, PVC hose extrusion precautions:
1. When directly extruding with powder, the temperature of the extruder is about 5℃ lower than that of pellets.
2. In addition to the smaller diameter (below φ60mm) tube blanks that do not need to be blown in for cooling and shaping, compressed air must be blown into the tube when the larger diameter tube blanks are cooled to ensure the accuracy and stability of the tube diameter. . Note that the compressed air pressure should be stable.
3. Pay attention to the stability of the traction speed to avoid changes in pipe diameter or pipe wall thickness due to unstable traction.
4. If the machine is shut down for a long time, the machine must be disassembled and cleaned to avoid decomposition problems.
The above is the production process of PVC transparent hose.
