This video is of a DEK Horizon during the "REPRINT" test portion, that is one aspect of our test strategies used in evaluating the machine capability and performance before shipping the machine to our Customers. This test combined with several others quantifies and provides the confidence level required.
In this reprint test, the PCB is printed and removed from the output conveyor track and transported back to the input track for reprint without any intervention. The machines vision and positioning systems along with the board support strategy must all be at optimal performance levels or the solder deposits will exhibit rapid deterioration accordingly.
Clearly, there are a host of other factors that contribute to the results of this test. However, we address them at prior stages of processing to achieve characteristic performance for the model tested.
You may notice a couple of deposits/ pads became smeared after a few prints. If you watch carefully, you will also see the person/cause transporting the PCB back to the input conveyor smear them with his thumb. The hazards of handling wet boards.
Of interest to some, is our use of common copier paper mounted to the sub straight in testing and videos. This provides good contrasting, aiding inspection methods and reduces sub straight influence on results. We began using this method in the early years of solder printing to aid process setup and verification, in addition to eliminating the need to remove solder deposits and avoid solider migration to all those difficult to clean areas.
This process and equipment are available for hands on demonstration, please visit us at 4TechUSA.com to make arrangements, or if you have questions.