Analysis of quality problems of polypropylene packing belt
DATE：2022/11/11 8:36:11 / READ： / SOURCE：This station
Analysis of quality problems of polypropylene packing belt
① Large size error of strip width before stretchinga. The water temperature and liquid level in the cooling water tank fluctuate.
b. The working speed of the screw is unstable, which makes the melt amount of the extrusion molding die unstable. The unstable screw speed may be caused by the slipping of the drive belt.
c. There are too many impurities at the filter screen, and the extrusion amount of blocked molten material is uneven.
② Large error in the width and size of the packing belt after stretching
a. The water temperature in the stretching water tank fluctuates greatly.
b. The rotation speed of the front and rear stretching traction rollers is unstable or the rotation speed of a group of traction rollers is unstable.
C. The pressure of the traction stretching roll on the belt is insufficient, causing the belt to slip on the roll surface.
③ Finished product packaging with cracks
a. The filter screen is broken or the mesh number of the filter screen is too small.
B. There are decomposition coke particles in the forming die
c. The working surface of the drive roller is not clean or smooth.
④ The finished packing belt has large bending
a. The installation position of each working transmission shaft cylinder on the line is incorrect, and the centerline between rollers is not parallel or horizontal.
b. The pressure of the traction stretching roll on the belt is uneven (it means that the transverse pressure of the upper roll on the lower roll in a group of traction stretching rolls is uneven).
c. The belt does not run in a straight line in the auxiliary machine, and the running direction swings left and right.
⑤ The finished pattern of the packing belt is not clear
a. There are foreign matters or residues on the embossing roll surface.
b. The transverse (width) pressure of the upper and lower pattern rollers on the belt is uneven.
C. The center line of the upper and lower pattern roller embossing is not on a vertical plane.
D. The belt temperature is inconsistent at the embossing position.
Author：admin