How should mixed PVA yarn lots be received and stored?

Receive each lot as its own stock identity

A single delivery can contain several PVA yarn lots. Keep each grade and lot separate even when cartons share a pallet, truck, or container. The delivery number identifies the shipment; the lot number identifies the material history. Combining those identifiers in one warehouse record makes it hard to trace a package if one run later behaves differently.

At receipt, compare the supplier's lot list with the labels on the actual cartons and cones. If several lots appear on one pallet, create a map of their positions before the pallet is broken down. If the map is missing or labels cannot be read, hold the affected packages until the supplier can identify them.

Segregate physically and in the stock system

Use labels large enough for the warehouse route and identify who owns the segregation rule. A small handwritten note that can fall off a carton is not a durable control. If repacking is necessary, transfer the original product and lot identity to the new package under the buyer's controlled relabelling process.

Issue material without merging the lot records

Production should record the lot and package IDs issued to a work order. If the process intentionally combines two lots, record both source lots and the quantity from each. That allows a finished batch to be traced back without claiming that the two incoming lots were one continuous production batch.

A hypothetical order may need one lot for the first machine and another lot for a later run because the package sizes differ. The schedule can still be efficient, but the traveler or system transaction should show where the switch occurred. Do not rely on an operator's memory to mark that boundary after a defect is found.

Reconcile holds and returns by the same lot list

If one lot is held or returned, count only the packages bearing that lot number. Keep the other lot identities distinct in the disposition and inventory adjustments. A supplier's replacement may carry a new lot, which should enter receiving as a new identity rather than inherit the old lot's release status.

For a package-by-package view of identification fields, see what to put on a PVA yarn package label. The label and warehouse lot map should use the same identifiers.

Audit the lot map before the shipment is closed

Before closing receipt, check that every carton is mapped to a grade and lot, every lot is assigned a storage location, and any held unit is blocked from issue. File the map with the packing list and receiving count. If a pallet combines lots in a way that makes safe handling difficult, tell the supplier which pallet pattern caused the problem and agree a revised packing plan.

The result is a usable boundary between production batches. It lets the buyer investigate a later variation without assuming that the mixed shipment itself was uniform.