Production & quality
Needle detection in garment factories: why it matters
Needle detection means passing finished garments through a metal detector to make sure no broken sewing-needle fragments remain inside. It is one part of a wider broken-needle control system, where every broken needle on the line is logged and replaced. It matters most for children's wear and school uniforms.
Key takeaways
- A broken needle fragment left in a garment is a critical (safety) defect.
- Detection is the final check. Broken-needle control on the sewing floor comes first.
- Jehotex passes 100% of finished garments through a metal needle detector.
- Metal trims such as snaps or zips also trigger the detector, so agree a detection approach for them.
Sewing machines break needles. On a busy sewing floor it happens as a matter of course, and the fragment usually stays on the machine or the table. Now and then it ends up inside a seam, a hem or a pocket. Needle detection exists so that fragment never reaches the wearer.
1. Why needle detection matters
| Reason | Explanation |
|---|---|
| Safety | A sharp fragment can injure the wearer, particularly a child |
| Retailer requirements | Many brands require documented needle control and detection, especially for children’s wear |
| Liability and recalls | A single incident can lead to claims, recalls and lost accounts |
| Process discipline | A clean detection record shows that the sewing floor controls its needles |
In AQL inspections, a metal fragment is a critical defect, with zero tolerance. See knitwear quality control.
2. How a needle detector works
Most garment-factory detectors are conveyor tunnels. A magnetic field is created inside the tunnel, and ferrous metal such as needle steel disturbs it as it passes. When the signal exceeds the set sensitivity, the conveyor stops or the detector alarms.
Handheld detectors are also used to locate the metal in a rejected garment, or to scan items that don’t fit the tunnel.
In practice, the operator sets the sensitivity and checks it against a test piece at regular intervals. Each garment goes through singly, flat, in a consistent orientation. Passes, rejects and calibration checks are all logged.
3. Broken-needle control on the sewing floor
Detection is the last step. A good factory controls needles well before then.
- New needles are issued only in exchange for the used or broken one.
- Every break is recorded in a broken needle log with time, machine and operator.
- All the pieces are collected and taped to the log. If a piece is missing, the garments in work at that machine are isolated and checked.
- Spare needles are kept locked, not loose at workstations.
- Scissors and tools are tied to the workstation.
- 100% of finished garments go through the detector.
4. Needle detection at Jehotex
Inspection and needle detection is stage 7 of our eight-stage production process. Every finished garment passes through a metal needle detector, children’s wear, school uniforms and orders for Europe and North America included, after measurement checks and AQL sampling or 100% inspection. See our quality control page.
5. Metal trims and detection
Metal trims set off the detector too, so plan for them early:
| Trim | Detection approach to agree |
|---|---|
| Metal zips | Detector-friendly or non-ferrous options; adjusted settings; check before attaching |
| Snaps and press studs | Non-ferrous options where possible |
| Aglets and eyelets | Plastic or non-ferrous alternatives |
| Plastic trims | No issue for metal detection |
On school uniforms and children’s wear, trims are a safety question in their own right, hood drawstrings above all. The checker below helps with that part.
6. What buyers should ask a supplier
- Is needle detection done on 100% of finished garments?
- At what stage — before or after packing into polybags?
- How is the detector’s sensitivity checked, and how often?
- Is there a broken needle log, and can I see a sample?
- What happens when a fragment can’t be found?
- How are garments with metal trims handled?
- Can detection records be shared with the inspection report?
If you use a third-party inspector, ask them to observe the detector and test-piece check during the final inspection.
7. After detection: packing
Detected garments should go straight into packing, kept apart from undetected stock, so nothing bypasses the check. Some buyers ask for a “needle detected” mark on cartons or a statement in the packing list. See export packing cartons for carton marks, and the EU apparel compliance guide for the wider product-safety context.
Final thoughts
Needle detection is simple to do and serious to skip. The detector catches what slips through, but the real safeguard is the discipline behind it: controlled needle issue, a broken-needle log, a rule that every fragment must be found, and 100% detection of finished garments. Ask suppliers about all of it, not just whether they own a detector. Planning an order for children’s wear or school uniforms? Start on our OEM/ODM page.