Common Problems and Solutions in the Production Process of PVC Boards Production Line

1. The surface of the board is yellow

Causes:

 Insufficient dose of stabilizers

 Insufficient external slip and large friction cause material decomposition

 The set temperature is too high

Solutions:

 Increase the dose of stabilizer

 Increase the dose of slippery agent

 Lower the temperature

2. The board surface is curved

Causes:

 The temperature setting of the three-roller is unreasonable

 The temperature difference inside the plant is large or the air convection is too fast

Solutions:

 Adjust the temperature setting of the three-roller

 Improve the environment of the plant

3. Cells or bubble stratification appear in cross-section

Causes:

 The melt strength is not enough

 The temperature of the PVC panel extruder or the mold is too high

 There are impurities in the raw materials

Solutions:

 Increase the amount of blowing agent

 Lower the temperature accordingly

 Pay attention to impurities in the raw materials

4. The thickness of the board surface is uneven

Causes:

 The gap between the mold lip is unreasonable

 The choke block is not properly adjusted

 The outer slip is too heavy, and the inner slip is insufficient

 The mold temperature setting is unreasonable

Solutions:

 Adjust the lip gap

 Adjust the choke block

 Reduce the dose of external slip or increase the dose of internal slip

 Adjust the mold temperature

5. The sheet has stripes perpendicular to the extrusion direction

Causes:

 The viscosity of the foaming regulator is too high

 The extruder or mold temperature setting is too low

 The traction speed is too fast

Solutions:

 Adjust the viscosity of the foaming regulator

 Increase the temperature of the extruder or mold

 Reduce the traction speed