Toy and craft production relies heavily on sewing, cutting, assembly and polishing processes, where broken needles, blade fragments, staples and screws are common metal contamination risks. Broken needle tips may remain in fabric, filling or packaging, while fine fragments can spread with material flow. Manufacturers typically use needle detectors for in-line screening at sewing and filling stages and metal detectors for final inspection of finished or bagged products, creating multiple checkpoints to reduce the chance of foreign objects leaving the plant.
Equipment selection should be based on product form and detection goals. For thin fabrics and plush filled products, a tunnel-type needle detector is often a sensible starting point, with attention to sensitivity and effective aperture size. For products containing aluminum foil, metal fittings or thick packaging, evaluate the phase adjustment and product-effect suppression of a metal detector. For complex crafts with mixed materials, X-ray inspection equipment can help identify internal foreign objects. Before purchase, test actual samples on the machine to confirm whether sensitivity and false-reject rates meet your acceptance criteria.
Routine checks and records matter just as much after installation. Verify detection sensitivity with standard test pieces each shift, keep conveyor belts and probe areas clean, and avoid false triggers caused by metal dust or static interference. When an alarm occurs, isolate the product and trace it back to the source process rather than simply resetting and releasing it. Operators should receive basic training on setup for different materials. Integrating equipment checks, exception handling and records into the quality management system helps metal contamination controls remain effective over time.