March 22, 2026 · Factory News · Traceability SOP
Lot-Level Traceability Card Standardized Across Teams
A single lot-card format now connects incoming, in-process, and shipment release checkpoints in one traceability chain.
Incoming inspection, in-process control, and shipment release now follow one lot card format. Buyers can review issue closure and ownership in the same record chain.
What Must Be On Every Lot Card
At minimum: material lot, process station, test method, result code, and responsible role. Missing one field breaks cross-stage tracking.
Use controlled vocabulary for defect names to avoid different teams describing the same issue in different words.
How To Close Issues Faster
When lot cards are linked, quality meetings can jump directly from issue code to owner and action deadline instead of repeating data collection.
Buyer-side visibility improves when closure status is shown in the same chain as initial inspection records.
Lot Card SOP Checklist
1. Use one defect vocabulary list across teams.
2. Require owner and due date for each open issue.
3. Keep closure evidence in the same lot record thread.
Source Note
Prepared from Yaoshun toy, tube, and equipment project practices plus public product modules. Snapshot date: April 12, 2026.