Twelve quality problems and solutions of PE pipesⅠ

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 will introduce the common PE pipe quality problems and the causes and solutions of the quality problems based on the experience in the production of PE pipes over the years.

1. Corrugations appear on the surface of the pipe.

Reasons: 1. Insufficient cooling 2. Inappropriate size of the 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 tank sealing ring is small, if it is small, replace or appropriately reduce the vacuum degree of the first section of the vacuum tank, and increase the vacuum degree of the second section of the vacuum tank.

2. The surface pitting (mainly the inner wall).

Reasons: 1. The raw material contains impurities. 2. The inner wall between the mouth and the core is not clean. 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.

Reasons: 1. The raw material is wet and the bubbles burst. 2. The amount of water in the sizing sleeve is uneven.

Solution: 1. Raw material drying 2. Adjust the amount of water or replace the sizing sleeve.

4. Bright spots on the surface.

Reason: insufficient water in the sizing sleeve.

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

5. The inner and outer walls are axially rough.

Reason: The moisture content of the raw material is too high.

Solution: raw material drying treatment.

6. The surface is not bright

Reason: the melt temperature is not suitable or the raw material is defective.

Solution: adjust the melt temperature or replace the raw material.

7. Scratches on the outer surface

Reason: sand and gravel are attached to the sizing sleeve, support plate or sealing ring.

Solution: clean the sizing sleeve, support plate or sealing ring.