Today Qingdao Sainuo pe wax manufacturers continues to take you to understand the second

part process of PVC pipe abnormal phenomenon causes and solutions.

4. There are coke particles or demarcation line in the wall of PVC pipe

Cause of occurrence:

(1)The filter plate is not clean;

(2)Temperature control instrument failure, fuselage and nose temperature too high;

(3)Dead Corner or scratch in the Machine Head memory;

(4)Screw wear or there’s decomposable material on the screw;

(5)The design of the head splitter is unreasonable and has a dead angle;

(6)PVC pipe extruder head inner surface rough, lag material;

(7)Manufacturing cycle is too long, material in the barrel residence time is too long.

The Solution:

(1)Stop the machine and clean the filter plate again;

(2)Lower the temperature, repair the instrument, and check it with the Mercury-in-glass

thermometer;

(3)Stop the machine, clean the Machine Head, and Polish it with a polishing wheel;

(4)Repair screw, polishing;

(5)Improving the structure of extruder head for PVC pipe;

(6)Stop the machine and polish the inner surface of the nose;

(7)Increase the extrusion speed or adjust the formula;

5.  Finish of the outer wall gloss poor or half of the outer wall bright.

Cause of occurrence:

(1)PVC pipe extruder die temperature is too low;

(2)PVC pipe extruder die temperature is too high;

(3)There are precipitates on the inner wall of the die;

(4)PVC pipe extruder center line and the vacuum sizing box center is not in a straight line.

The Solution:

(1)Increase die temperature of PVC pipe extruder;

(2)Properly reduce the die temperature of PVC pipe extruder;

(3)Clean the mold and remove the precipitates;

(4)Adjust the center of vacuum sizing box to a straight line.

6. The inner wall of the PVC pipe is uneven

Cause of occurrence:

(1)The main reason for the irregular depression of the inner wall is lack of melting;

(2)The regular raised “Pimples” on the inner wall is mainly because the screw temperature is

too high and the rotation speed is too fast;

(3)The core die temperature of PVC pipe extruder is too low

The Solution:

(1)Improve the temperature of PVC pipe extruder host, improve the speed, promote melting;

(2)Reduce the temperature of the main engine and screw speed;

(3)Raise the core mold temperature.

Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax,

EVA wax, PEMA, EBS,Zinc/Calcium Stearate…. Our products have passed the REACH,

ROHS, PAHS, FDA testing.

Sainuo rest assured wax, welcome your inquiry!

Website：https://www.sanowax.com

E-mail：sales@qdsainuo.com

               sales1@qdsainuo.com

Adress：Room 2702,Block B, Suning Building, Jingkou Road, Licang District,

Qingdao,China.