Senke
Also: Materialfluss-Senke, Zielknoten, Zielstation, Endpunkt Materialfluss, Senken
AI-generated
In material flow planning, a sink is the destination point at which material arrives and exits the flow. It is the counterpart to the source and is a fundamental modeling element in warehouse planning, simulation, and control logic.
Key facts
- A sink is the end point of a material flow at which goods leave the process under consideration.
- The counterpart to the sink is the source; together they form the basic structure of every material flow model.
- In WCS and material flow computers, sinks serve as destination addresses for transport orders.
- The capacity of a sink limits the achievable overall throughput of a system and is a key parameter in bottleneck analyses.
- Whether a point is considered a sink depends on the chosen frame of reference – the same station can be a source in a different model.
What is a sink?
In material flow, a sink denotes a node at which goods complete their transport journey – whether permanently or until the next process step. A sink is not a physical object but an abstract modeling element: it describes a role within the system. Any point at which material leaves the flow under consideration can be defined as a sink. Its counterpart is the source, which introduces material into the flow.
Typical manifestations in practice
In intralogistics, sinks appear in many forms. Common examples include:
- Storage locations where stored goods come to rest
- Picking stations where items are removed from the conveyor stream
- Production machines that consume material
- Goods-out gates and dispatch areas where goods leave the warehouse
- Buffer and consolidation zones that are treated as temporary sinks in higher-level models
Whether a point is considered a source or a sink always depends on the frame of reference. A goods-in gate is a sink from the supplier's perspective, but a source from the perspective of the internal warehouse.
Importance for planning and control
Source-sink models are the foundation of every material flow analysis. Planning tools and simulation software represent material flows as directed graphs in which sinks mark the end nodes. Based on these models, transport relationships, throughput requirements, and potential bottlenecks can be calculated.
In Warehouse Control Systems (WCS) and material flow computers (MFC), sinks are stored as destination addresses for transport orders. The correct definition of sinks is therefore a prerequisite for conveyor technology and control software to work together reliably. Incorrect or incomplete sink definitions lead directly to misrouting or system downtime.
When designing a system, the number and capacity of sinks significantly determine the achievable overall throughput. Bottleneck analyses therefore examine whether sinks are able to fully absorb the material flow generated by sources. If the intake capacity of a sink is lower than the inflow, a backlog develops that can slow down the entire system.
What to consider when modeling
The granularity of the sink definition influences the informative value of the analysis. Definitions that are too coarse – for example, treating an entire dispatch area as a single sink – can obscure real bottlenecks. Definitions that are too fine increase modeling effort without a proportional gain in insight. A level of detail that corresponds to the actual control logic of the system is most appropriate. Vendors of planning and simulation software implement the term sink in partly different ways – it is worth checking the tool-specific definition before comparing models across systems.
Related terms
- AGV
AGV (Automated Guided Vehicle) refers to driverless transport vehicles that automatically move goods in warehouses and production environments. They follow predefined or sensor-controlled routes without a human driver.
- Automatiklager
An automated warehouse is a fully or partially automated storage system in which the receipt, retrieval, transport and management of storage units are carried out without manual intervention, using conveyor technology, storage and retrieval machines, and a higher-level control software.
- Bestandsführung
Inventory management refers to the system-supported administration and continuous updating of all warehouse and material stocks within a company. It forms the basis for planning, procurement and accounting – and ensures that the book inventory and physical inventory are in agreement at all times.
- Bottleneck Analyse
Bottleneck analysis identifies the process step with the lowest capacity in a logistics system, making the limiting factor for overall throughput visible.
- Cross-Docking
Cross-docking is a logistics method in which goods are transferred directly from inbound to outbound transport at a transshipment point, without going through conventional put-away and storage.
- Cross-Docking
Cross-docking refers to a goods handling process in which items are transferred directly from inbound receiving to outbound shipping without interim storage. The goal is to reduce throughput times and avoid warehousing costs.
- Dimensionierung
Dimensioning refers to the systematic design of warehouse capacities, material handling equipment, and logistics systems based on volume frameworks, throughput requirements, and peak loads. It forms the planning foundation for investment decisions in intralogistics.
- Disposition
Disposition refers to the operational planning and control of resources, quantities, and orders in logistics – for example in transport or materials disposition. It encompasses capacity assignment, scheduling, prioritization, and response to disruptions.
- Distributionslogistik
Distribution logistics encompasses all processes that move goods from the manufacturer or warehouse to the end customer – from network planning through storage and transportation to order fulfillment.