Archive for September, 2009
Profiling ovens and processes with multiple conveyor speeds
Posted by Rex Breunsbach in M.O.L.E. MAP, Profiling, Solar Cell Manufacturing, Thermal Profiling on September 29th, 2009
BTU Tritan Solar Cell Furnace
Ovens used in the metallization of solar cells can have 20 or more heating and cooling zones. These ovens can become quite long if the conveyor speed in the initial curing and final cooling sections are the same as the firing section. By speeding up the conveyor speed in the firing section the oven can be shortened and temperature of the cells can be increased and decreased more quickly.
Multiple conveyor speeds are also encountered in food processing lines where the food product passes through a several machines running at different speeds.
ECD’s newest profiling software can accommodate multiple conveyor speeds. Most profiling software assumes the
Solar Cell Metalization Time-Temperature Profile
conveyor speed in all zones is the same. ECD’s new M.O.L.E. MAP® software version 2.18a allows entry of a different conveyor speed for each zone.
Proper positioning of oven zones on profile time-temperature data requires accurate knowledge of the conveyor speed. By knowing the sampling interval, length of each zone and the conveyor speed one can calculate how many temperature samples “long” a particular zone occupies.�
Verifying Wave Solder Machines using a WaveRIDER
Posted by Paul Austen in Wave Solder, Wave Solder Profiling on September 28th, 2009
Much of what takes place in a Wave solder machine boils down to 4 basic measurements:
(see Figure 1)
- (Max preheat) How hot the board is just before it hits the wave
- (Dwell time) how long do you spend in the wave
- (Contact temp) Temperature of the solder at the contact surface with the board
- Conveyor speed
All the rest of the many measurable parameters are secondary to these in my opinion. Let’s talk a little about each of these as measured by the WaveRIDER SPC software:
Figure 1: WaveRIDER SPC Software
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