Analysis of Common Problems in Coating Machine Maintenance

1. Tail

(1) In terms of materials: slurry material, viscosity, solid content, slurry (surface) tension

(2) In terms of equipment: distance between the coating and the back roller, speed of the coating roller when the back roller bounces open, diameter of the back roller, and surface material of the back roller. Deformation of the back roller. Parallelism between the back roller and the coating roller, non parallelism between the back roller and the front roller of the oven. Tension during operation.

(3) In terms of operation: parameters for adjusting the head and tail

2. The head and tail are not parallel

(1) In terms of materials: the gravitational force on both sides of the substrate is uneven.

(2) In terms of equipment: the horizontal planes of the back roller and the coating roller are not parallel; When the back roller bounces open, it is uneven on both sides; The coaxiality of the back roller surface, the non parallelism between the back roller and the traction roller, and the horizontal changes.

(3) Tension adjustment roller adjustment status

3. The front and back are not aligned

(1) In terms of operation, the consistency of the first gap. The operating parameters are not adjusted properly. The optical eye is blocked. The unwinding and feeding rollers forgot to clamp

(2) Equipment aspect: The tension behind the second side is high, while the tension in the front side is low

4. The blank space decreases during the middle startup, and the accuracy of the last 3-4 pieces is not accurate

In terms of equipment: The initial tension during startup is inaccurate, and there is no memory function on the first side. When starting up, the foil slides forward by 2-3mm. The tension is first turned on during startup, and the back roller does not rotate. The coating head has no clamping roller or is not clamped.

5. The last piece has a parallel trailing edge

In terms of operation, the distance between the coating back rollers (with the first side trailing and the second side not trailing); The back roller pulls slowly when the machine is stopped

6. Thick head and thin tail or thin head and thick tail

Operational aspect: The head and tail parameters have not been properly adjusted.

7. Actions have no effect

(1) In terms of materials, the elasticity on both sides of the foil material is uneven

(2) In terms of equipment: When the tension of the foil material is low, it leaves the back roller instantly. The distance between the coated back rollers

8. Double sided large blank space phenomenon

The optical eye does not sense, the first gap is abnormal, and the optical eye is blocked