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Twelve Quality Problems and Solutions of PE Pipe


Release time:

Aug 26,2019

Some unexpected quality problems often occur in the production process of PE pipes, which are generally caused by problems with equipment or raw materials. The following shandong wenyuan building materials will be based on years of experience in pe pipe production one by one to introduce common pe pipe quality problems and the causes of quality problems and solutions. Waviness on the surface of the 1. pipe. Reasons: 1. Insufficient cooling 2. Inappropriate size of sealing ring, resulting in vibration. Solution: Increase the water intake of the sizing sleeve or increase the distance between the mouth and the sizing sleeve. Check whether the size of the vacuum groove sealing ring is small. If it is small, replace or appropriately reduce the vacuum degree of the first vacuum groove to increase

Some unexpected quality problems often occur in the production process of PE pipes, which are generally caused by problems with equipment or raw materials. The following shandong wenyuan building materials will be based on years of experience in pe pipe production one by one to introduce common pe pipe quality problems and the causes of quality problems and solutions.
 

Waviness on the surface of the 1. pipe.
 

Reasons: 1. Insufficient cooling 2. Inappropriate size of sealing ring, resulting in vibration.

 
Solution: Increase the water intake of the sizing sleeve or increase the distance between the mouth and the sizing sleeve. Check whether the size of the sealing ring of the vacuum groove is small. If it is small, replace or appropriately reduce the vacuum degree of the first vacuum groove and increase the vacuum degree of the second vacuum groove.
 

2. surface pitting (mainly inner wall).

 
Reason: 1. The raw material contains impurities; 2. The inner wall between the mouth and the core is not cleaned; 3. The local temperature is too high,
 

Cause aging. Solution: 1 check the raw materials 2 clean up or transition for a period of time 3 check the temperature sensor
 

3. surface pits.

 
Reason: 1 raw material moisture, bubble rupture 2 sizing set water amount is uneven.
 

Solution: 1 raw material drying 2 adjust the water volume or replace the sizing sleeve
 

4. surface bright spots.
 

Cause: the amount of sizing set water is insufficient.
 

Solution: increase the water volume of sizing sleeve or replace the sizing sleeve with large water volume
 

The inner and outer walls of the 5. are axially rough.
 

Reason: raw material water content is too high.
 

Solution: raw material drying treatment
 

6. surface is not bright
 

Reason: The melt temperature is not suitable or there is a problem with the raw material

 
Solution: adjust the melt temperature or replace the raw material
 

Scratches on the outer surface of the 7.
 

Cause: sand and gravel attached to sizing sleeve, support plate or sealing ring
 

Solution: Clean sizing sleeve, support plate or sealing ring
 

Waterline of external surface of 8.
 

Reason: the local water eye of sizing sleeve is blocked, resulting in excessive water volume of individual water eye.

 
Solution: Clean sizing sleeve

 
Grooves on inner wall of 9. (mostly in wall thickness pipes)

 
Reason: the wall thickness is too thick, the melt is difficult to cool, resulting in flow.

 
Solution: Try the central cooling system to reduce the temperature of the mouth and core.


10. pipe wall thickness uneven
 

Reason: 1) The bolt of the mouth touch or core touch is loose, and the gap adjustment of the mouth touch is inappropriate. 2) The temperature of the mouth or core touch is uneven, resulting in inconsistent material flow. 3) The sizing sleeve is not in-line with the mouth, and the spiral diversion shuttle or screen is blocked.

 
Solution: 1) Tighten the bolt or adjust the gap of the mouth touch 2) Check the heating ring and temperature sensor 3) Adjust the sizing sleeve and the mouth touch to fold the shuttle or screen.


XI. Low elongation at break


Reasons: 1. The raw materials are not well synthesized; 2. The orientation increases and the cleanliness increases.


Solution: 1 adjust the process temperature, strengthen the plasticizing effect 2 increase the distance between the mouth and the sizing sleeve.


XII. Large ovality:


Reason: Gravity

 
Solution: increase the correction device

 
PE pipe manufacturers must establish strict evaluation procedures for raw material suppliers, select suitable raw materials and carry out appropriate treatment according to the detection of raw materials. The production of high-quality polyethylene pressure pipes is highly dependent on the comprehensive output capacity of the equipment. Pipe manufacturers must fully investigate and demonstrate the selection of equipment in order to select equipment with higher cost performance. Pipe manufacturers should establish strict operating procedures and process procedures and strengthen the process and control efforts, in order to achieve both control the quality of the pipe and a reasonable reduction in production costs. The process setting of pressure pipes and the solution of quality problems in the production process require a lot of production experience, which requires manufacturers to accumulate a large number of original data, analyze and summarize, and guide production to achieve steady improvement in product quality.














































































































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