Can Magnetic Separators Replace Metal Double-Sheet Detectors?

On production lines, the Metal Double-Sheet Detector and magnetic separators are common devices used to prevent double-sheet feeding. Some wonder whether magnetic separators can fully replace Metal Double-Sheet Detectors. This article compares their principles and line positions and concludes that magnetic separators cannot completely replace Metal Double-Sheet Detectors.

Principles and placement

A Metal Double-Sheet Detector detects double sheets using single or dual sensors based on electromagnetic induction properties of metals. It senses double feeding during conveyance and sends signals to the host for handling. These detectors are adaptable and can be adjusted for different feeding positions to meet production needs.

Magnetic separators use magnetic force to separate metal sheets and prevent double-sheet feeding. They are usually mounted near the feed inlet and use magnetic attraction to spread sheets and maintain spacing. Magnetic separators operate at lower speeds, about 20 pieces per minute, and suit scenarios with lower throughput requirements.

Differences in efficiency and function

Metal Double-Sheet Detectors and magnetic separators differ in speed and function. Metal Double-Sheet Detectors can achieve high detection speeds, for example around 1200 pieces per minute, improving line efficiency and quickly detecting double feeds to protect product quality.

In contrast, magnetic separators have relatively low throughput and cannot match the detector speed. At about 20 pieces per minute, they are unsuitable for high-volume, high-speed production where fast and accurate detection is required.

Functional differences

Beyond speed, Metal Double-Sheet Detectors often integrate chips and can output signals to the host for tracking and statistical analysis. This enables real-time monitoring and process control. Magnetic separators lack this integrated detection and data features and simply use magnetic force to separate sheets. They cannot distinguish non-magnetic metals or provide tracking and analysis functions needed for line monitoring.

Conclusion

Both devices play important roles on production lines. Their principles, line placement, efficiency, and functions differ. While magnetic separators can assist in some scenarios, they cannot fully replace Metal Double-Sheet Detectors. Select the appropriate device based on production demands to ensure efficient operation and product quality.