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.
Line Cleanout Protocol
Operational Procedure
Standardised industrial cleaning sequences dictate how manufacturing machinery must be cleared of residual materials between production batches to prevent cross-contamination. In textile spinning, a line cleanout protocol establishes the sequence of steps for removing flax fibres of one grade before processing a different grade or fibre type on the same equipment. This procedure is mandatory in mills that produce both organic and conventional linen yarns.
By running the machinery empty for a designated period and vacuuming the carding zones, operators ensure that the transition between product lines is completely clean and documented.
Execution Method
Operators begin by stopping the draw frames and combing machines to extract all remaining slivers and accumulated waste. Following this step, they execute the line cleanout protocol by using compressed air and vacuum systems to clear the drafting rollers of loose short fibres. This manual clearance ensures that no stray fibres from the previous run are carried over into the next batch.
Production Log
Mill supervisors record the completion of each cleaning cycle in the shift logbook to maintain traceability. This documentation is required for organic textile certifications and serves to prove that the spinning line was completely isolated between runs. Without these logs, the resulting yarn cannot be sold as certified organic linen under global standards.