Large injection molding workshops operating dozens of hot runner molds with dozens of unique thermocouple specifications require standardized unified labeling systems for spare probes, installed on-mold sensors and extension cables, to eliminate specification mixing, misinstallation and lost traceability problems. A complete labeling system integrates engraved metal permanent labels, color-coded plastic tags, digital QR code batch labels and mold wiring drawing matching marks, covering all thermocouple storage, installation and maintenance links with clear multi-dimensional identification information.
Permanent engraved metal labels are fixed onto each armored thermocouple sheath near the cable joint, carrying core fixed parameter information that cannot fade or peel off under high-temperature workshop environments. Standard engraved content includes thermocouple type (J/K), sheath material (316L/Inconel/Hastelloy), tolerance grade (Grade 1/Grade 2), total probe length, structural type (ring washer/spring/dual-point bent) and unique batch serial number. Laser engraving is adopted to avoid ink fading caused by high-temperature radiation and mold release agent chemical corrosion, which plagues paper sticker labels. When maintenance staff disassemble probes from molds, they can quickly confirm full specifications by reading the metal label without searching archived drawing files, eliminating cross-specification misreplacement errors.
Color-coded plastic hanging tags are used for warehouse spare parts inventory classification, establishing unified color matching rules corresponding to core attributes. For example, yellow tags for K-type thermocouples, white tags for J-type; red tags for Inconel high-temperature anti-corrosion probes, blue tags for standard 316L stainless steel; green tags for Grade 1 precision medical/automotive models, gray tags for Grade 2 packaging general models. Spare thermocouples are placed into color-matched labeled storage bins according to tag color, allowing warehouse staff to quickly locate required specifications without reading full text labels, greatly improving spare part picking efficiency during emergency mold maintenance. Each plastic tag also prints simplified specification shorthand and mold model matching codes.
QR code digital batch labels are attached to spare part packaging bags, storing complete traceability data including raw material test reports, factory three-point calibration curves, production date, service life limit and matching mold model range. Warehouse management software scans QR codes to automatically record stock in/out records, calculate FIFO shelf rotation reminders and send replenishment alerts when safety stock thresholds are reached. During customer quality audits, scanned QR codes can export full thermocouple certification documents instantly, supporting IATF 16949 and ISO13485 traceability requirements without manual paper file sorting.
On-mold wiring matching labels are pasted beside each multi-pin mold connector and manifold wiring box, marking the heating zone number, corresponding thermocouple specification and wire color polarity rules. When replacing damaged probes on production lines, technicians compare connector labels with new thermocouple metal engraved marks to confirm matching specifications before wiring, avoiding mixed J/K type and reversed polarity human errors. All labels near manifold plates adopt high-temperature resistant silicone material to resist long-term radiant heat without deformation or peeling.
Quarterly inventory audits verify label integrity, replacing faded, scratched or lost tags for stored spare thermocouples and on-mold sensors. A standardized multi-layer thermocouple labeling system unifies identification logic across warehouse storage, mold assembly and on-site maintenance links, completely eliminates specification mixing faults and realizes full life cycle traceability of every temperature sensor in the workshop.
