As a wet cycle in PERC cell creation, irregularities, for example, belt printing and roller printing have turned into a typical issue in numerous cell creation lines.
- The age of roller marks
1.1 Analysis of the age of roller marks
Subsequent to drawing or in the EL chart and the carved roller position predictable imprints called roller denotes, the fundamental explanation is because of roller anomalies, one is the roller surface joined to the stain, poisons tainting of silicon wafers; the second is the presence of roller burrs, bringing about roller silicon wafer surface scratches.
1.2 Typical actual attributes of roller marks
On the off chance that it is through the roller erosion is unimaginable to expect to have roller marks happen, however the carved roller in the 180 degree course adjustment and the silicon wafer has a sliding grating, can be locked by whether the roller marks are discontinuous.
The EL picture has issues overall surface, which can be decided by the roller structure, as different rollers are direct contact, and can be locked by the rollers with face contact.
1.3 Roller print picture examination
1.4 Etched score roller print
- Causes
After the wafer leaves the engraving tank astound, there is as yet a modest quantity of etchant on the scratched surface, and a slight synthetic response is as yet happening on the carved surface before it enters the water shower. As there are four contact surfaces between the progression roller and the wafer, this will cause the four contact surfaces to respond diversely to the remainder of the wafer, and a roller imprint will be created.
With respect to step roller: in view of the later antacid and corrosive washing and unadulterated water cleaning, it will be somewhat killed, yet the huge number of step rollers utilized, the later soluble and corrosive washing won’t be wiped out and should be utilized as little as could be expected and lost.
Note: This is especially uncommon, however has a related impact.
- Potential measures
a. Substitution of fine tooth rollers: 4-5 when opening can be fitted with strung rollers, or all in the wake of opening.
b. Roller marks brought about by step rollers can be upgraded by expanding the pattern of each wash just as controlling the progression of new water to 12 L/min, matching the rollers to the cycle needs.
c. for the scratching tank after the progression roller brought about by roller marks, analyzed in similar boundaries under the states of low speed evacuation impact is essentially better compared to high velocity, in the wake of cleaning is completely equipped for eliminating, when running with fast, you can upgrade the boundaries, however there are constraints in the boundaries, you can let the cycle boundaries are likewise changed by supplanting the roller.
d. The low dissemination stream pace of the drawing tank brings about the wafer leaving the scratching tank, the back carving tank level holding divider is excessively high, bringing about a more slow flood of etchant, typically the stature of the back holding mass of the carving tank can be somewhat lower than the front holding divider, so that the etchant floods from the back holding divider however much as could be expected, the course stream rate is too low will likewise influence the flood.
1.5 Drying shower tumbler print
- Causes
a. Inadequately improved formula, bringing about helpless hydrophobicity prior to entering the drying segment, further prompting the crush roller not having the option to adequately eliminate leftover water and more water staying in the silicon wafer entering the drying segment.
b. low temperature and wind stream settings in the drying segment.
c. Helpless dispatching of hardware, continuous hindering and stacking of wafers, bringing about wafers conveying water into the drying region.
d. Twisting of the rollers, or imperfections and burrs on the outer layer of the rollers.
- Potential measures
a. Check the impact of Rinse3 pressing water, the new water stream can be expanded suitably to guarantee great hydrophobicity after each wash and that the crushing roller can viably eliminate deposits from the wafers.
b. Change the drying tank air volume size 190-200L/min and temperature 59-60°C (these two variables will influence the belt print and tumbler print).
c. Checking and supplanting the applicable issue rollers.
d. As a feature of the stack is in the drying Track Roller Manufacturers shower, change the distance of the air blade on the drying shower from the wafers 7 wafers (experimental incentive for reference).
Note: The tumbler print might be connected with the unadulterated water at the outskirts, and issues with the unadulterated water are additionally the reason for helpless hydrophobicity in the wafers.
- Expansion – about hydrophobicity
a. In typical activity, assuming there are still roller stamps despite the fact that there are no irregularities like hindering or stacking of wafers, and the drying temperature and wind current are ordinary, then, at that point, all things considered, the helpless hydrophobicity of the wafer has prompted the powerlessness to viably eliminate the water roller and the wafer surface is conveying a lot of water into the drying.
b. Similar drawing gear, similar cleaning boundaries, 156 wafer hydrophobicity is awesome, 166 wafer hydrophobicity is more clear inadequacies, with the item size or material changes, cleaning boundaries important to do investigating enhancement, improvement course is primarily through the proper expansion in antacid and corrosive wash water fixation, the progression of water washing.
- The handling stream of roller printing
2.1 Drying region contamination treatment
a. Unadulterated water flushing of all water washing box rollers and water change (rinse1, 2, 3).
b. Expulsion of the upper/lower tumblers from the drying box and washing with unadulterated water then, at that point, drying with sans dust paper, taking consideration to relate to the first position individually when introducing them back.
c. Wipe the lower unique rollers with unadulterated water on sans dust paper and dry them again with dry residue free paper.
d. Drying is begun for 30 min, drying air volume size 190-200L/min, temperature 59-60°C, setting 2000pcs of sham sheets.
e. At last PL check the normal sheet, 3-4H can continue the machine.
2.2 Dirty roller print brought about by different positions
a. Assuming that the roller print shows up on the non-diffuse surface, it very well may be settled by expanding the carving tank stream rate fittingly.
b. Assuming the ruining circumstance is light, it tends to be taken out by running a spurious film. On the off chance that the dirtying circumstance is more not kidding, you can beat all the tank answer for the tank, wipe every one of the rollers aside from the carving tank with liquor, then, at that point, wipe with DI water, lastly run a spurious film to continue the machine.
c. Delicately stacked sheets will barely defile the rollers after rinse3 and can be gathered 20-30 sheets in succession straightforwardly in the path where the sheets are stacked.
d. A ffu outside air framework or space partition can be added to the infeed region.
2.3 Treatment of debased rollers
In the event that the roller is debased, it should be washed clean with unadulterated water. Regardless of whether creation can be continued by running countless phony tablets, the buildup of the medication on the roller will shape an obstinate, when it reoccurs, it will turn out to be increasingly not kidding.
Cleaning roller strategy: normal is to utilize hydrogen peroxide + hydrochloric corrosive, or drawing tank arrangement drenched for ten minutes, and afterward put in unadulterated water for cleaning, in the event that the new roller is supplanted, on account of oil, with soluble base dousing, messy, with corrosive splashing.
2.4 Downtime tumbler print treatment
a. By and large need to run a spurious piece of around 2000 for around 1 hour of personal time.
b. On the off chance that there is a personal time circumstance, need can be given to opening the drying box and the tumbler for turn.
2.5 Different width roller print treatment
2.6 Roller support, adjustment (reference)
- Models from the studio site
3.1 Selected photos of the site
3.2 Complete drenching in the pickling tank
3.3 RINSE3 and the drying shower