Understanding Physical Chain of Custody versus Mass Balance Credit Swapping
Physical chain of custody locks raw fiber origin to individual yarn bolts, while mass balance credit swapping balances paper accounts without physical tracing.
Batch Lot Traveler
Processing Record
Physical tracking documentation accompanies raw flax fiber through hackling and wet spinning to capture operational parameters at every workstation. A batch lot traveler attaches to a designated quantity of material upon entry to the mill floor, creating an audit trail of operator signatures and machinery settings. In Chinese spinning mills, this document records critical fiber metrics including hackled flax line yield and yarn count stability across draw frames.
The record isolates defective output to specific production shifts, preventing compromised yarns from entering weaving preparation.
Routing Verification
Operational sequences required for specific yarn specifications dictate the movement of material through roving and wet spinning machines. A batch lot traveler details machine assignments, draft ratios and spindle speeds necessary to meet target lea counts. Quality inspectors verify moisture content and sliver weight against specified tolerances at each transfer point before signing the routing card.
Discrepancies between targeted machine parameters and recorded operational values prompt immediate isolation of the affected sliver cans. Mill technicians adjust draft zone settings when recorded linear density strays from specified limits, protecting yarn uniformity across the batch. The document remains physically attached to material carts until final skein winding or cone packing completes.
Transfer Boundary
Accountabilities shift once material leaves the spinning department for downstream fabric formation or export packing. A batch lot traveler terminates its operational function when grey yarn enters the conditioning room for final moisture equilibrium verification. Final data entries transfer to the enterprise resource planning system, while the physical card enters archival storage for quality audits.
Fabric mills require matching traveler numbers on yarn packing lists before accepting shipment lots into inventory.