In 2006, Zhenhengli single-decker printing presses were exported to India. Shortly after the commissioning team returned home, a service call came in from India reporting paper jams. Through communication with interpreters, it was discovered that Indian operators were unfamiliar with the mechanical double-sheet controller. The issue arose because they failed to adjust the mechanical double-sheet controller when switching between thin and thick paper stocks. Upon receiving this market feedback, technicians immediately researched and discovered that globally renowned multicolor offset presses—such as Heidelberg, Roland, KBA, Komori, and Mitsubishi—now employ ultrasonic double-sheet detectors. Furthermore, Pepperl+Fuchs, Heidelberg's parts supplier, had established an office in Shanghai. Technicians promptly contacted the company's marketing team and conducted tests at their Beijing factory, achieving excellent results. Indian customers also received the parts promptly. After installation, the inconvenience of switching between thin and thick paper was resolved.
The Pepperl+Fuchs ultrasonic double-sheet detector is now standard equipment on Zhenhengli export-model presses. However, due to cost and pricing constraints, it remains an optional part for models sold domestically. Henan Anyang Hongqiqu Printing Company experienced high scrap rates when printing gold cardstock on their Beiren N300 four-color offset press due to mechanical double-sheet controllers causing paper scratches. After learning Zhenhengli could assist with installing this non-contact double-sheet controller, they promptly retrofitted it onto the Beiren N300 press. The scratching issue was resolved, orders were saved, and the customer was highly satisfied.
With nearly 50 years of technical development experience in the printing and papermaking industry, Germany's Pepperl+Fuchs has established long-term successful technical collaborations with world-renowned printing and papermaking machinery companies. Its ultrasonic double-sheet detector operates on the principle of ultrasonic energy attenuation in different media to distinguish single and double sheets. By utilizing ultrasonic waves for paper detection, it achieves non-contact sensing while offering immunity to color variations, lighting conditions, and paper dust—advantages unattainable with photoelectric sensors. This makes it a superior solution for the printing and paper industry. Furthermore, Pepperl+Fuchs ultrasonic sensors have undergone secondary development tailored to industry-specific requirements. The new ultrasonic double-sheet sensor can adapt to various paper grammages through mode settings. Standard papers ranging from 20 g/m² to 2000 g/m² require no prior learning. For conventional offset presses, once installed, no adjustments are needed when switching between different papers during operation, greatly simplifying end-user operation! Leveraging years of industry expertise, we provide specialized technical support tailored to customer and market demands, addressing diverse application requirements!