Common problems and solutions in the production of PVC wood-plastic building templates
Common problems and solutions in the production of PVC wood-plastic building templates1. Yellow surface
a Insufficient stable dose
Increase the number of stabilizers
b Insufficient external slip and high friction, causing material decomposition
Increase the number of external slip agents
c Temperature setting is too high
Reduce the temperature
2. The middle of the surface of the plate yellows
a The mold local temperature is set high
Lower the temperature
b Insufficient external slip
Increase the number of external lubricants
c Extruder 5 zone high temperature
Lower the temperature
3. Uneven plate thickness
a Unreasonable gap in the die lips
Adjust the thickness of die lips
b Improper adjustment of choke block
Adjust the choke block
c Excessive slippage
Reduce the number of slippage
d Insufficient internal slip
Increase the number of internal slips
e Unreasonable mold temperature setting
Adjust the mold temperature
4. The plate is brittle
a The temperature setting of the extruder is too high
Reduce the temperature
b The temperature setting of the extruder is too low
increase temperature
c Unreasonable formula
Adjust the recipe
5. The surface of the plate is not smooth
a Insufficient external slip
Increase the number of external slip agents
b Insufficient processing aids
Increase the number of processing aids
c Insufficient dispersion of fillers or additives
Adjust the number of fillers or additives
d Mold temperature setting is too low
Increase mold temperature
e The temperature setting of the extruder is too low
Increase extruder temperature
f The temperature of the extruder and die is set too high
Reduce the temperature
6. There are stripes perpendicular to the extrusion direction
a The viscosity of the foaming regulator is too high
Adjust the brand of foam regulator
b The temperature setting of the extruder is too low
Increase extruder temperature
c Mold temperature setting is too low
Increase mold temperature
d Towing speed is too fast
Reduce traction speed
7. There are big bubbles in the plate
a Insufficient melt strength
Increase the amount of foam regulator
b Extruder 5 zone temperature is too high
Lower the temperature
c The mold temperature at the corresponding place is too high
Lower the temperature
e has impurities
Pay attention to raw material impurities
f Large return block
Regrind
g screw wear
Replace the screw
8. Curved surface (free foam)
a Unreasonable temperature setting of three rollers
Adjust the three-roller temperature setting
b The temperature difference inside the plant is large or the air convection is too fast
Improve plant environment
9. The foaming sheet has large cells
a The extruder temperature is set high
Reduce the temperature
b Low foaming adjustment dose
Increase the amount of foaming regulator
c Improper lubrication adjustment
Adjust lubricant ratio
10. The thickness of the board is not easy to control and moves back and forth
a Too much slippage
Reduce the amount of external slip agent
b Unstable mold temperature
Calibrate the thermometer to improve the control accuracy
c Screw wear
Replace the screw
11. The core of the sheet has large pores and small surface pores
a High host temperature
Reduce the host temperature
b Improper lubrication adjustment
Adjust lubricant ratio
c Insufficient melt strength
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