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Metal Detection Machine with Drop-Down Rejection Application Case (Nuts in the Food Industry)
I. Case Background and Customer Pain Points
A foreign food company faced key pain points in its nut processing:
Metal Foreign Matter Risk: Nuts are prone to contamination with metal impurities such as nails and wire. Traditional manual sorting is inefficient and has a high rate of missed detection, posing a serious threat to food safety and brand reputation.
Production Automation Needs: The foreign food industry has high compliance requirements (such as FDA and IFS certifications), requiring fully automated inspection processes to reduce manual intervention.
Cost-Efficiency Conflict: Traditional metal detection equipment has low rejection efficiency, leading to production line downtime and increased defective product rates, indirectly driving up production costs.

II. Adaptability of Drop Reject Technology
Drop rejection is the core sorting logic of metal detectors. It utilizes a combination of gravity and mechanical mechanisms to achieve precise rejection, making it highly compatible with nut processing scenarios:
Product Feature Adaptation: Nuts (such as almonds and cashews) vary greatly in density and shape. Drop rejection precisely intercepts metallic foreign matter through a combination of gravity drop and mechanical interception, avoiding damage to nuts (such as breakage and deformation) caused by traditional air-blowing methods.
Flexible Production Adaptation: Rapidly switch between different nut varieties (e.g., from almonds to pistachios) by adjusting the drop channel size and rejection force, enabling flexible “one machine, multiple products” production.
Compliance Adaptation: Meets the “zero metal residue” standards of the European and American food industry, meeting the stringent metallic foreign matter detection requirements of certifications such as the FDA and IFS.

III. Case Implementation Details
Preliminary Research: Customized a drop-type rejection channel (150mm wide, 800mm long) based on the customer’s production scenario, matching the nut conveying speed (200kg/h);
Equipment Commissioning: On-site simulated metal foreign body (nails, wire) detection achieved a rejection accuracy of 99.9% and a rejection speed of ≤0.5 seconds per check, meeting production line cycle times;
After-Sales Support: 24-hour remote monitoring and quarterly on-site maintenance ensure stable equipment operation, resulting in a 30% increase in customer production efficiency and a 90% reduction in metal foreign body complaints.

IV. Case Value and Industry Implications
Customer Value: Through drop-type rejection technology, the customer achieved “zero metal foreign body residue, improved production efficiency, and compliance assurance,” helping the customer secure a leading position in the European and American markets.

Industry Implications: Drop-type rejection technology can be replicated in other food segments (such as baking ingredients and grain processing). Its core approach is to precisely match “product characteristics with process requirements,” providing a technical model for food companies upgrading to automation.