HDPE pipe fitting suppliers believe that as superior quality pipe, external viewing should be:
1. The appearance is smooth, even and symmetrical.
2. The exterior color is consistent.
But occasionally the surface of the PE pipe is rough and there are grooves. What is the reason for this?
In the process of production, raw materials, temperature, pressure, equipment and so on will affect the nature of PE pipe products.
Analyze the Cause
Temperature aspect
1. Adjust the process temperature, improve the cooling water temperature, or improve the production speed;
2. check the waterway to see if there is blockage or uneven water pressure (uneven on all sides), resulting in rough water point or excessive water pressure and too quick cooling speed.
Equipment aspect
1. Check whether the cylinder, head and additional heating rings are damaged, resulting in insufficient processing temperature and rough appearance.
2. Check the temperature of the mold core. If it is higher than the temperature of the die section, raise or lower the temperature of the core (for the inner wall is rough).
3. Wash the mold (0.5-1CM inside the core mold of the mouth die is especially easily to produce coke, resulting in not only the surface).
4. Adjust the distance between the sizing sleeve and the die (the closer it is, the smoother it will be. Press and polish by the sizing sleeve).
Raw materials
Adjust the formula by referring to the raw material parameters of this batch (solute size, processing temperature, etc.), which is usually caused by the poor ratio of low melting finger and high soluble finger.
Causes of gouging on the outer surface:
Equipment aspect
1. Adjust the outlet pressure of the diameter setting sleeve, and the water output requirement is balanced. Too much water easily causes the ditch.
2. Adjust the nozzle angle of the vacuum setting box to ensure uniform cooling of the pipe.
Check for debris, burrs and additional hardware such as die, sizing sleeve and cutting machine.
Raw materials
The replacement of raw materials will also form a stripe groove, need to pull a period of time can be improved. When changing the type of raw materials, it is necessary to use about 200KG of low melting finger pure material to wash the barrel first, clean the other materials in the barrel, and then use the formula material for production.
The inner surface is gauged
1. Check whether the inner tube is flooded. If water is flooded, pinch the tube blank of the outlet mold firmly so that the mouth is closed. Large caliber must be shutdown to drain out the water before starting again, or when the joint is built with material dam, prevent water from pouring into the newly connected pipe.
2. Reduce the internal temperature of the mold (the higher the temperature is, the more sensitive it is to the smoothness of the mold).
3. Wash and repair the polishing mold, such as the mold has thorns or accumulated coke.
4. Overly prolonged shutdown time causes local low core mold temperature or scaling.
Problems and solutions of PE pipe production
Metal pipes and concrete pipes used to occupy the main market of the pipeline industry, but with the continuous development of material science, the performance of plastic pipes has been considerably improved. Its durability, temperature resistance, oxidation and aging resistance has gradually exceeded the traditional pipes, and has been widely recognized by the world's promotion and market.
Among them, PE pipe has numerous advantages, such as building water supply, building drainage, buried drainage pipes, building heating, gas pipes, electrical and telecommunications protection sleeves, industrial pipes, agricultural pipes and other aspects can see its figure. A extremely wide range of applications is the first choice for numerous projects.
PE pipe
PE pipe is made of polyethylene (PE) material by processing technology. PE molecules have no polarity, so the stability is particularly excellent, no decay, rust, electrochemical corrosion phenomenon. The chemicals present in the soil do not pose any obstacles to the pipes. Therefore, the PE pipeline has great strength, high temperature resistance, corrosion resistance, wear resistance and other characteristics.
HDPE pipe fitting suppliers believe that as superior quality pipe, external viewing should be:
1. The appearance is smooth, even and symmetrical.
2. The exterior color is consistent.
But occasionally the surface of the PE pipe is rough and there are grooves. What is the reason for this?
In the process of production, raw materials, temperature, pressure, equipment and so on will affect the nature of PE pipe products.
Analyze the Cause
Temperature aspect
1. Adjust the process temperature, improve the cooling water temperature, or improve the production speed;
2. check the waterway to see if there is blockage or uneven water pressure (uneven on all sides), resulting in rough water point or excessive water pressure and too quick cooling speed.
Equipment aspect
1. Check whether the cylinder, head and additional heating rings are damaged, resulting in insufficient processing temperature and rough appearance.
2. Check the temperature of the mold core. If it is higher than the temperature of the die section, raise or lower the temperature of the core (for the inner wall is rough).
3. Wash the mold (0.5-1CM inside the core mold of the mouth die is especially easily to produce coke, resulting in not only the surface).
4. Adjust the distance between the sizing sleeve and the die (the closer it is, the smoother it will be. Press and polish by the sizing sleeve).
Raw materials
Adjust the formula by referring to the raw material parameters of this batch (solute size, processing temperature, etc.), which is usually caused by the poor ratio of low melting finger and high soluble finger.
Causes of gouging on the outer surface:
Equipment aspect
1. Adjust the outlet pressure of the diameter setting sleeve, and the water output requirement is balanced. Too much water easily causes the ditch.
2. Adjust the nozzle angle of the vacuum setting box to ensure uniform cooling of the pipe.
Check for debris, burrs and additional hardware such as die, sizing sleeve and cutting machine.
Raw materials
The replacement of raw materials will also form a stripe groove, need to pull a period of time can be improved. When changing the type of raw materials, it is necessary to use about 200KG of low melting finger pure material to wash the barrel first, clean the other materials in the barrel, and then use the formula material for production.
The inner surface is gauged
1. Check whether the inner tube is flooded. If water is flooded, pinch the tube blank of the outlet mold firmly so that the mouth is closed. Large caliber must be shutdown to drain out the water before starting again, or when the joint is built with material dam, prevent water from pouring into the newly connected pipe.
2. Reduce the internal temperature of the mold (the higher the temperature is, the more sensitive it is to the smoothness of the mold).
3. Wash and repair the polishing mold, such as the mold has thorns or accumulated coke.
4. Overly prolonged shutdown time causes local low core mold temperature or scaling.
HDPE pipe fitting suppliers believe that as superior quality pipe, external viewing should be:
1. The appearance is smooth, even and symmetrical.
2. The exterior color is consistent.
But occasionally the surface of the PE pipe is rough and there are grooves. What is the reason for this?
In the process of production, raw materials, temperature, pressure, equipment and so on will affect the nature of PE pipe products.
Analyze the Cause
Temperature aspect
1. Adjust the process temperature, improve the cooling water temperature, or improve the production speed;
2. check the waterway to see if there is blockage or uneven water pressure (uneven on all sides), resulting in rough water point or excessive water pressure and too quick cooling speed.
Equipment aspect
1. Check whether the cylinder, head and additional heating rings are damaged, resulting in insufficient processing temperature and rough appearance.
2. Check the temperature of the mold core. If it is higher than the temperature of the die section, raise or lower the temperature of the core (for the inner wall is rough).
3. Wash the mold (0.5-1CM inside the core mold of the mouth die is especially easily to produce coke, resulting in not only the surface).
4. Adjust the distance between the sizing sleeve and the die (the closer it is, the smoother it will be. Press and polish by the sizing sleeve).
Raw materials
Adjust the formula by referring to the raw material parameters of this batch (solute size, processing temperature, etc.), which is usually caused by the poor ratio of low melting finger and high soluble finger.
Causes of gouging on the outer surface:
Equipment aspect
1. Adjust the outlet pressure of the diameter setting sleeve, and the water output requirement is balanced. Too much water easily causes the ditch.
2. Adjust the nozzle angle of the vacuum setting box to ensure uniform cooling of the pipe.
Check for debris, burrs and additional hardware such as die, sizing sleeve and cutting machine.
Raw materials
The replacement of raw materials will also form a stripe groove, need to pull a period of time can be improved. When changing the type of raw materials, it is necessary to use about 200KG of low melting finger pure material to wash the barrel first, clean the other materials in the barrel, and then use the formula material for production.
The inner surface is gauged
1. Check whether the inner tube is flooded. If water is flooded, pinch the tube blank of the outlet mold firmly so that the mouth is closed. Large caliber must be shutdown to drain out the water before starting again, or when the joint is built with material dam, prevent water from pouring into the newly connected pipe.
2. Reduce the internal temperature of the mold (the higher the temperature is, the more sensitive it is to the smoothness of the mold).
3. Wash and repair the polishing mold, such as the mold has thorns or accumulated coke.
4. Overly prolonged shutdown time causes local low core mold temperature or scaling.