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Chemical Engineering

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Dual-action inspection and weighing for packaging

| By Mary Page Bailey

This company has developed a new unit that combines metal detection and weighing to streamline product packaging applications, leading to improved reliability, throughput rates and accuracy. The Metal Detector Checkweigher Combo (photo), unveiled at Pack Expo in Chicago, employs a high-performance weigh cell that uses electromagnetic force restorations (EMFR) technology, instead of the traditional strain gages used in other scales. Moving along a conveyor, the package is first inspected for metal. If traces of metal are detected, the package is automatically rejected without slowing down the line. As pure packages continue along the conveyor, they are then checked for accurate weight. If it is either over or under the prescribed weight, then it is rejected into a different bin. — Bunting-Newton, Newton, Kan.