A knitwear buyer should agree how the supplier will control broken needles and other metal contamination, what inspection can detect, and who can release affected garments before production begins. Specify the garments, trims, processes and shipment batches covered. A detector pass is evidence from a defined inspection under stated conditions; it is not proof that every possible sharp object has been eliminated.
Start with the actual order and buyer requirements
Ask your retailer or quality team for the current written policy that applies to your product and destination, including any requirements for subcontractors. Record its owner, version and coverage. If no buyer policy exists, agree an order-specific plan with the supplier and, where needed, an independent quality specialist. Do not assume a machine setting found in another brand’s manual applies to your goods or establishes legal compliance.
Give the supplier the garment specification, production sites, decoration processes, packing format and intended metal components. Ask where knitting, linking, sewing, embroidery, trim attachment and packing will take place. Confirm whether any work moves to another company and how its records reach the party releasing the shipment. Include removable needles and pins, damaged equipment and loose components in the discussion, not just the detector at the end of the line.
A retailer’s April 2018 metal contamination policy illustrates this broader approach: it covers needle control, outsourced embroidery and detection. It is an example of that retailer’s historical policy, not a current universal standard or evidence of a WTBF procedure.
Make the proposed check compatible with the finished garment
List metal zips, snaps, decorative elements and packaging components before requesting a detection plan. Have the supplier and inspection provider review the actual finished garment and packing arrangement, including the largest or thickest configuration and different metal trims. A trim description alone does not demonstrate that an item can be inspected at the agreed setting.
Hashima’s needle inspection guide describes magnetic needle detectors and explains that even non-ferrous accessories can produce a reaction depending on their composition, quantity or surface coating. The manufacturer also describes X-ray inspection as an option for some articles that cannot pass its needle detector. The suitable method and its limitations must be confirmed for the actual equipment and garment; an alternative inspection does not automatically offer equivalent detection.
If an intended zipper repeatedly triggers the proposed machine, do not authorize an undocumented reduction in sensitivity just to obtain a pass. Request evidence of the issue, the proposed remedy and its effect on the agreed requirement. The options might include a different approved trim, a revised construction or an alternative inspection route. Compare cost, appearance, timing and the detection limitations before approving a change. If none meets the requirement, keep the affected styles on hold and seek a documented decision from the buyer’s quality owner.
Put inspection coverage in a release matrix
Use a matrix to connect the buyer’s requirement to the supplier’s actual process. The entries below are questions to complete for the order, not claims that a particular supplier provides these services.
| Decision | Buyer supplies or defines | Supplier or inspection provider confirms | Record before release |
|---|---|---|---|
| Scope | Styles, colour and size variants, destination and policy version | Sites, subcontracted steps and batches covered | Order reference and list of covered variants |
| Metal components | Approved zip, button and decoration specification | Trim identity and compatibility with the proposed method | Approved trim reference and trial result |
| Inspection setup | Required method, evidence and acceptance conditions | Machine, operating configuration, garment presentation and limitations | Setup and check record tied to the batch |
| Incident response | Notification contact and release authority | How suspect goods are identified, isolated and investigated | Incident ID, affected quantity, evidence and disposition |
| Shipment decision | Required report and deadline before dispatch | Quantity inspected, accepted, held and rejected | Signed reconciliation and any open exceptions |
Ask whether garments are checked individually, in their final packaging or at another agreed point. Record how the inspection sequence prevents checked and unchecked garments from being mixed. If a later operation opens the package or adds a metal component, agree whether that operation changes the approved inspection sequence. The site’s general pre-shipment checklist helps with appearance and packing; this matrix adds a specific control for contamination and its evidence.
Agree what happens after a broken needle or an alarm
Before production, ask for the supplier’s written incident process and the identity of the person who may stop and restart work. It should explain how a suspected break or missing sharp item is reported, how the potentially affected work is separated, how the search is recorded and who decides the disposition of material that cannot be cleared. Do not assume that finding one fragment establishes that all pieces have been recovered.
Also agree how an inspection alarm is handled. Identify the affected garment and batch, prevent it from being mixed back into passed stock, and record the investigation and final decision. If a suspected contaminant cannot be found, or the evidence does not support release under the agreed policy, keep the affected scope held for the authorized decision. Specify the treatment of reworked garments and what further inspection is required; a verbal assurance that the issue was fixed is not a batch record.
Separate a broken-needle event from a routine machine alarm. Either may lead to a hold, but the facts, affected goods and investigation may differ. Ask for a report that states the event, time, production step, quantities, action and sign-off without including worker personal information. Review the supplier’s proposed procedure against the actual buyer policy; the 2018 retailer example should not be presented as a universal disposal or calibration rule.
Check evidence before authorizing dispatch
Request a report that identifies the order, styles and variants, production and inspection dates, inspection provider, method and configuration, relevant verification records, quantities checked and results. Reconcile passed, held and rejected quantities to the corresponding batch and packing list. Ask who reviews exceptions, where the underlying records are kept and whether records from subcontracted decoration are included. A report from a sample or a different order cannot establish inspection coverage for the shipment.
Agree a response to a failed equipment check: identify the period and goods potentially affected, hold them, restore the inspection system and decide the necessary reinspection with the quality owner. Set the hold boundary and evidence requirement before the incident; otherwise a factory and buyer may disagree about which cartons are eligible for release. Keep final contamination clearance distinct from measurement, visual and packaging approvals.
For example, suppose an order includes a metal-zip cardigan and a button-front cardigan. The supplier proposes the same magnetic detector for both. Before buying production trims, request finished examples of both constructions and a trial at the required settings. If the zipper design prevents the agreed check while the button design passes, do not transfer the button result to the zip style. Hold the zip decision until an approved trim or inspection plan has evidence covering that construction. This scenario is hypothetical and is not a WTBF test result or quotation.
Send a usable inquiry
When requesting a knitwear quotation, provide the product drawings, style and quantity breakdown, destination, known trim specifications, any retailer policy and the required inspection or documentation. Ask WTBF to confirm the proposed production and subcontracting route, available inspection arrangements, limitations, associated costs and lead-time effects for the specific order. Capabilities, equipment, testing and any external inspection must be agreed for the project rather than assumed from this guide.