Innovative Techniques For Module Production
A large part of manufacturing for photovoltaic modules incorporates
handling and processing glass. Bystronic glass makes a significant
contribution in all areas to ensure that the systems run smoothly and
effectively.
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The German-Swiss company is entirely at home processing glass: For
more than 40 years it has been recognized for providing innovative
machines, systems and services in glass processing. From basic
components to automated, customer-specific complete solutions, Bystronic
glass offers extraordinary concepts with unsurpassed quality – and the
same applies to the Solar Industry.
Edge grinding of glass substrates
Cleanly ground edges of substrates are absolutely essential to
ensure a smooth production process for solar modules. High edge quality
free from cracks and shell defects is the only way to prevent glass
breakage during the process. This is an important pre-condition for
efficient and economical production since glass breakage is a relevant
cost factor and always means a stoppage of the system. Whenever glass
breakage occurs, the production systems must be run empty and cleaned.
C grind of the edges
Automatic changing system for grinding wheels
Then production has to be resumed again. "Grinding machines from
Bystronic glass stand for the highest quality in ground glass edges. For
many years the company has established a strong reputation and
successful track record with machines of similar design for the
automotive industry,” explains Markus Lipp Sales Manager and Project
Engineer in the Swiss Bystronic glass Technology Center.
champspeed’grind makes it possible to grind edges from a minimum
finished dimension of 200 mm x 200 mm to a maximum finished dimension of
2200 mm x 2600 mm with C grind or K grind. The yield is 99.5 percent.
Thanks to a mineral cast machine bed, champ’speed-series machines
are completely vibration-free and can therefore provide the greatest
precision. Substrates can be ground with extremely fine tolerances of
+/- 0.1 mm on absolutely perpendicular sides, even if the starting
substrate has large deviations in the angles. As the machines are
designed as polar grinding machines with a play-free table, both edges
and corners are polished in one pass, with radius or facet. All axes are
equipped with maintenance-free and highly dynamic CNC direct drives.
The new spindle design works in seconds with two grinding wheels
arranged one over the other. "Additional time advantages are derived
first from an automatic correction of the grinding wheel diameter, with
changeover to another module series or substrate size taking less than
five minutes, for example, as well as from the use of an automatic
changing system for grinding wheels,“ comments Markus Lipp in Machine
Technology. Thanks to the modular layout of the series, champ’speed
machines can be expanded to create large manufacturing cells with an
integrated handling device and additional drilling machine.
Applying backrails automatically
Backrails are used to fasten thin layer modules in place and to
provide stability for modules with especially large surfaces. Tape or
liquid adhesive is applied to modules of all sizes for this purpose.
Bystronic glass Technology Center Bystronic Armatec provides semi or
fully automatic systems for processing and applying backrails. They are
available as a stand alone solution or can be integrated into existing
lines. "Depending on the module size, up to four rails can be placed on
one module at the same time, or four rails can be placed on two modules
in twin mode. This process facilitates the shortest cycle times,“
explains Thomas Ommerle Sales Engineering Solar at Bystronic Armatec.
Depending on the rail being processed, positioning accuracy is +/- 0.5
mm.
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