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Tabbing Stringing Final DR 18/12/09 09:35 Page 27
Assembling cost reductions
Every incremental saving assists manufacturers achieve the cost effectiveness of their
products to be able to increase market acceptance. Even the amount of material and
chosen process in assembling solar modules can provide invaluable savings to the
overall cost. Schmid Technology Systems discusses the latest Tabber Stringer the
company is offering the industry with a view to provide a more cost effective and
productive method of assembly.
Schmid Technology Systems has developed a new
design and concept for tabber stringers, created in
cooperation with the Wolf company, that
deliberately moves away from the traditional
method of soldering ribbons to solar cells. The
successful partnership between Schmid and the
company Wolf Produktionssysteme has already
existed for several years with a number of
successful collaborations. Wolf
Produktionssysteme’s expertise is in the
construction of speciality machinery for automating
assembly and special soldering processes. They
were the ideal partner for Schmid in the new
development of Schmid’s own Tabber Stringer. The
echnology Systems GmbH
companies developed an exclusive agreement at
the end of 2008 with a view to develop the new
Issue VI 2009
This new system has a number of innovative Source: Schmid T
additions with a high precision performance
combined with minimum cell handling and a
soldering method that radically reduces the risk of
cell damage as well as reduces solder waste. The to the machine by means of a transport carrier and Cells are introduced to
new Tabber Stringer has also being designed with separated using separation nozzles. The cells are the machine by means
floor space and cost in mind with a space saving taken by a suction gripper and placed sunny side of a transport carrier
footprint of only 3.3 mÇ and an attractive price of up on the prepared solder ribbon on the turntable. and separated using
590,000 €. A camera checks the exact orientation of the grids separation nozzles
in relation to the ribbons. In the next process step,
Tabbing and Stringing Process the solder ribbons are prepared for the front side
In this new system jointly developed, the tabbing of the solar cell.
and stringing occurs in two distinct steps. The
tabbing unit is equipped with a turntable that very When the solder ribbons and cell are exactly
precisely indexes the cells to the individual positioned, the turntable indexes further to the
processing stations. Initially, solder ribbon for the soldering position. Here only the upper soldering
rear side of the cells is drawn from a roll, flux is ribbons are contacted. The solder is melted by
applied to it over a flux bath, then the ribbon is means of resistance heating and the solar cell is
affixed in a frame on the turntable and finally fused with both the front and the back soldering
cropped. Then the turntable is indexed to the next ribbon. The vacuum plates of the turntable, which
step in the process. Solar cells are then introduced permanently hold the cells and the solder ribbons
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