During the coating process, the phenomenon of poor coating gap and wrinkling of the pole piece is analysed:


I. The phenomenon of poor coating gap and reasons


1. Tail dragging

(1) material: slurry material, viscosity, solid content, slurry (surface) tension

(2) equipment: coating - back roller distance. The speed of the coating roller when the back roller pops open, the diameter of the back roller. Back roll surface material. Deformation of back roll. Parallelism between back roller and coating roller, non-parallelism between back roller and oven front roller. Tension in operation.

(3) Operational aspects: head and tail adjustment parameters


2. Head and tail not parallel

(1) Material aspect: the gravity of the two sides of the substrate is not flat.

(2) Equipment aspects: back roller and coating roller level is not parallel; back roller pop open left and right are not aligned; back roller surface coaxiality, back roller and traction roller is not parallel, the level changes.

(3) Tension adjusting roller adjusting state


3. Front and back are not aligned

(1) Operational aspects: the first side of the gap consistency. Operating parameters are not adjusted . The photoeye is blocked . Unwind pinch roller forget to clip

(2) Equipment: the second side of the back tension. Front tension is small


(4) The white space in the middle of the machine becomes small when the machine starts, and the back 3-4 pieces are inaccurate.

Equipment: the tension is not allowed at the beginning of the start-up, the first side has no memory function, the foil belt slides forward 2-3mm when the machine is started, the tension is opened first when the machine is started, the back roller is not turned, there is no pinch roller at the coating head or it is not pinched on.


5. The last piece is parallel and trailing.

Operation: Coat the back roller spacing (the first side of the tail drag, the second side does not drag the tail); stop when the back roller to pull open slow.

6. head thick tail thin or head thin tail thick

Operation: head and tail parameters are not adjusted.

7. There is no effect of action

(1) Material: the two sides of the foil tension is not the same

(2) Equipment: foil tension is small instantly leave the back roller. Coating back roller spacing

8. Double-sided large white phenomenon

The photoeye is not sensed, the first side of the gap is abnormal, the photoeye is covered.

II. Coating section length changes, spacing instability

1. section length changes (* shortened) * spacing changes in small (narrower) fault causes

(1) The surface of back roller and back rubber roller is not clean;

2) The gap between the back roller and the rubber roller is too small and too tight;

3) Front and rear tension mismatch, unwinding is larger than winding.

Solution

1）Clean the rollers

2）Adjust the oblique block to a fixed position

3）Adjust with reference to the set parameters

2. Segment length varies greatly (*shortens) Pitch varies greatly (becomes larger) Fault cause

Detect the head of the pole piece and the head of the next piece of the length of the pole piece if the change is large (become smaller), the tail between the two segments of the pole piece change is small, so that you can judge the solenoid valve (control of the rubber roller movement) is not flexible.

3. segment length changes in large (* longer) * spacing changes in large (wider) causes of failure


1) the back roller, back rubber roller surface is not clean.


(2) there is no pinch roller, may not be clamped or out of control

(3) front and rear tension mismatch, winding is greater than unwinding

Solution

1）Clean rollers

2）Increase the pinch roller

3）Refer to set parameters adjustment


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