Edge Isolation System
Prevents insulation and corrosion of the
thin-film glass substrate by using laser to remove film from the
edge of the substrate
The edge isolation system is designed to remove film from the
peripheries of the glass substrates of thin-film photovoltaic
cells using lasers uniquely developed by Nisshinbo Mechatronics.
When thin-film photovoltaic modules are assembled, film on
the glass substrate periphery needs to be removed to prevent
insulation and corrosion. The general film removal process of
"sandblasting process" involves an abrading agent being sprayed
on the glass substrate to remove the film, so any residual
abrading agents need to be washed off. This can damage the glass
substrate surface as well, and many thin-film photovoltaic cell
manufacturers sought a better way to deal with the waste
particulate resulting from sandblasting.
Edge isolation systems remove the film using a high-powered
laser, so the volume of particulate matter is significantly
reduced, and no cleaning equipment is required. This virtual
elimination of particulates allows for its installation within
the clean room, presenting much greater flexibility in deciding
where to install the equipment, as well as affording a
significant reduction in processing time. This ensures the
optimum removal process.
Features
- Detects breaks in a module's fingers and dark area that
cannot be found visually using Nisshinbo's original
software.
- Detected defects show up in color, so they are
eye-catching.
- Four cells each are shot in high resolution per module.
(PVE 1116i-M, PVE 1120-T)
- Short tact time of 45 to 60 seconds per module including
transfer time is available. (PVE 1120-T)
- Light-shield cover can be opened and closed simply.
Comparison with sandblasting
| |
Edge isolation system |
Sandblasting + washing |
| Size |
Saves space |
Occupies considerable space Equipment must be
enclosed to contain dust |
| Washing |
Removes residue using dry cleaners or suchlike |
Washing |
| Impact on film |
No adverse affect on other areas |
Scattering of abrasive agent may damage the film
surface, thus reducing module output |
| Others |
Very small amount of residue remains on the glass
substrate, and post-processing is easy. |
Even after being washed, some abrading agent may
remain on the glass surface, causing problems during the
lamination process |
Adaptability to specification changes
- Substrate size change
- Edge removal width change
- Additional laser heads, etc
Basic configuration
- Laser system
- Loading and unloading conveyers
- Vacuum pump
- Chiller
- Dust collector
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