Problems

Reason

solution

1. yellow board

no enough stabilizer

Adding more stabilizer

2.  Insufficient external slip, big friction,causing material decomposition

Increase the number of outer slip agent

2. Temperature setting too high

Lower Temperature

2.yellow of the middle surface part

1. High mold local temperature

Lower the corresponding temperature

insufficient outer lubricant

Increase outer lubricants

2. high temperature of Extruder zone 5

Lower the corresponding temperature

3.Sheet thickness is not uniform

Unreasonable lip gap of mold

Adjust mold lip thickness

The choke block is improperly adjusted

Adjust the choke block

Excessive external slip

Reduce the number of external slides

internal slip is insufficient

Increase the number of internal slides

Mold temperature setting is not reasonable

Adjust mold temperature

4.Sheet brittle

The extruder temperature is set too high

Reduce the temperature

The extruder temperature is set too low

Raise the temperature

The formula is unreasonable

Adjust the formula

5.The surface of the sheet is not smooth

Not enough outside slide

Increase the number of outer slip agent

Insufficient processing AIDS

Increase the number of processing AIDS

Insufficient dispersion of fillers or auxiliaries

Adjust the number of fillers or additives

Mold temperature setting is too low

Increase mold temperature

Extruder temperature setting is too low

Increase the extruder temperature

Extruder, mold temperature set too high

Reduce the temperature

6.streaks perpendicular to the extrusion direction

Foaming regulator viscosity is too high

Adjust the brand of foaming regulator

The extruder temperature is set too low

Increase the extruder temperature

Mold temperature setting is too low

Increase mold temperature

Traction speed is too fast

Reduce traction speed

7. large bubbles in the plate

Insufficient melt strength

Increase the dosage of foaming regulator

The temperature in extruder zone 5 is too high

Reduce the corresponding temperature

The mold temperature is too high

Reduce the corresponding temperature

has impurities

Beware of raw material impurities

Large return block

Return to grinding

Screw wear

Replace screw

8.Panel bending (free foaming)

three roller temperature setting is not reasonable

Adjust three roller temperature Settings

Large temperature difference inside the building or too fast air convection

Improve plant environment

9.Foam sheet bubble hole is large

High extruder temperature setting

Reduce the temperature

foaming regulation dose is low

Increase the dosage of foaming regulator

Improper lubrication adjustment

Adjust lubricant ratio

10.Sheet thickness is not easy to control and moves back and forth

Too much outside slide

Reduce the amount of external slip agent

Mold temperature is unstable

Calibrate the thermometer to improve the control accuracy

Screw wear

Replace screw

11、The bubble hole in the core of the sheet is large while the bubble hole on the surface is small

The temperature of host is too high

Reduce main engine temperature

Improper lubrication adjustment

Adjust lubricant ratio

melt strength is insufficient

more foaming regulator dosage