Kanbankort

A kanbankort, or kanban card, is a signaling device used in kanban-based pull systems to authorize the production or replenishment of inventory. It is typically attached to a container or bin and serves as a physical signal that triggers a downstream process.

Origin and meaning: The term kanban comes from Japanese, meaning signboard or card. Kanban cards were a core element of the Toyota Production System, developed in the 1950s, to implement just-in-time manufacturing and limit stock.

Contents and design: A kanban card usually carries data such as part number, description, the quantity to produce or move, the source and destination locations, supplier or batch information, and sometimes a date or lot number. Depending on the system, the card may indicate the type of signal (production, withdrawal, or supplier) and the required action.

Types and use: Manufacturing kanban cards authorize the production of a defined quantity at a downstream process. Withdrawal (or transport) kanban cards authorize the movement of material from storage to the production line. Supplier kanban cards provide signals to replenish stock from an external supplier.

Operation: In a typical two-bin system, when the active bin is depleted to a reorder point, the kanban is sent to the replenishment point to trigger production or purchase. After the new items are produced or arrived, the kanban is returned for reuse. This pull mechanism reduces waste and keeps inventories aligned with demand.

Modern variants: In many organizations, physical kanban cards are replaced by electronic signals, barcode scans, or RFID. Digital kanban systems integrate with ERP and manufacturing execution systems while preserving the signaling logic.