Waterborne calendering common faults and troubleshooting methods (2)

(1) Cause of failure

1 paper humidity is too high or uneven humidity;

2 excessive pressure or uneven pressure;

3 The deformation of the rubber roller and the aging of the rubber roller.

(2) Remedy

1 Check and adjust the pressure to make it uniform;

2 Reduce pressure and raise temperature properly;

3 Pay attention to the humidity of the paper, make it uniform and consistent with the workshop environment.

4 Note the ageing and deformation of the rubber roller. If necessary, re-grind and smooth the roller.

V. Sticking and stripping difficulties during calendering

(1) Cause of failure

1 high calendering temperature;

2 Varnish is not fully dried, and residual solvents are too much;

3 calendered oil coating;

4 Pressing pressure is too large;

The emulsion in varnish is too slow

6 The band surface is dirty or has resin deposits.

7 original used pressure oil is oil soluble or alcohol soluble

(2) Remedy

1 The coating must be fully dried before calendering;

2 properly reduce the calendering temperature;

3 increase the thickness of the coating of the calendered resin;

4 reduce pressure pressure;

5 Change the type of emulsion to increase the amount of release agent.

6 Clean the band. It is best to polish it once.

7 Thoroughly clean the calender belt with the cleaning solution

Six, pressure film surface streak, orange peel, hair and other phenomena

(1) Cause of failure

1 Calendered resin (polishing oil) with high viscosity and thick coating;

2 After the polishing oil polishing, poor leveling, uneven coating;

3 The printed ink is not dry, and oil and oil repulsion occurs with the polish oil;

4 print surface dust;

5 printed surface ink crystallization, coating hair;

6 The calender temperature is too low to soften the resin;

7 Pressing pressure is too small.

(2) Remedy

1 Press ink before printing must be fully dried;

2 Ink crystallization and other failures must be applied to the primer:

3 properly reduce the viscosity of the resin and improve leveling;

4 Increase the calendering temperature and pressure appropriately.

Seven, the brightness of the film on both sides of the film is not uniform

(1) Cause of failure

1 The thickness of coating on both sides of the calender coating is inconsistent

2 The pressure on both sides of the light band is not equal;

3 As the rubber roller is pressed for a long time, the thickness of the middle and both sides is not uniform;

4 The degree of wear or cleaning on both sides of the optical tape is not

(2) Remedy

1 Note that the resin coating is uniform;

2 Adjust the pressure on both sides of the optical tape to make it uniform.

3 Keep the surface of the light belt clean;

4 Observe the deformation and adjustment of the rubber roller.

Source: China Ink Technology Network