Internal Kanban
Internal Kanban is a pull-based replenishment signal used inside a plant or warehouse to trigger movement, production, or resupply of material only after actual consumption, rather than by forecast or push scheduling. It typically uses a card, bin, label, or digital ticket to authorize the next internal action, such as moving parts from a supermarket to a line, replenishing a point-of-use rack, or issuing maintenance spare parts from a central store.
On the shop floor, internal Kanban keeps fixed-quantity containers at the point of use so operators pull the next container only after the current one is consumed. When a bin empties, the Kanban signal is scanned or returned to internal logistics, which creates a replenishment task from an internal location rather than an external supplier. This exchange is common between a warehouse and a production line, a central store and a maintenance crib, or two internal departments moving semi-finished goods. The method makes consumption visible, limits work-in-process, and reduces excess inventory and stockouts when card count, container size, and lead time are correctly set. In digital form, internal Kanban is executed through mobile devices, tablets, or desktops, allowing status tracking from request through delivery. The result is a demand-driven internal supply loop that aligns material movement with actual consumption.
- Lost or misplaced Kanban signal: When a card, label, or bin is misplaced, replenishment is not authorized and downstream stations starve even though material may exist elsewhere in the plant.
- Incorrect loop sizing: If container size or card quantity is set too low for real consumption and internal lead time, the loop cycles too slowly and causes line-side stockouts; too high inflates inventory and hides problems.
- Weak internal receiving discipline: Without scanning, confirmation, or physical closure of the replenishment loop, inventory records diverge from reality and the system shows available stock that is not actually at the point of use.
Is Internal Kanban the same as production Kanban?
Not exactly. Internal Kanban is the broader internal replenishment mechanism, while production Kanban specifically authorizes internal manufacturing of a fixed quantity of semi-finished goods or components.
What data is typically needed to size an Internal Kanban loop?
Demand rate, replenishment lead time, container quantity, and safety buffer are the core inputs used to determine card count and prevent shortages.
What operational failure does Internal Kanban prevent?
It prevents overproduction and excessive internal movement by releasing replenishment only when material is actually consumed.