A conveyor system is the mechanised network that continuously transports products between work points in a warehouse — from receiving and storage to picking, sorting and shipping. It is the backbone of any automated operation: it reduces manual travel, increases throughput and makes material flow predictable. This guide explains the types of conveyors, their components, how to choose between them, and how they integrate with sorting and control software.
In short: choosing the right conveyor starts from three questions — what you move (product size and shape), how fast (target throughput in units per hour) and in what space (a new building or an existing warehouse). Every other decision follows from these.
What a conveyor system is
A conveyor is a device that moves products along a fixed path, using rollers, belts or chains. A conveyor system combines several such sections into a continuous flow, with branches, accumulation, level changes and decision points. Unlike manual or forklift transport, a conveyor delivers a steady, measurable flow that is easy to synchronise with the rest of the equipment.
In a modern distribution center, the conveyor links the key zones together: it brings goods from receiving, distributes them to storage, moves orders from picking to consolidation and delivers finished parcels to automated sorting and the shipping lanes.
Benefits of a conveyor system
- Higher, steadier throughput. A conveyor does not tire and has no rhythm variation; it maintains a stable flow of hundreds or thousands of units per hour.
- Less manual travel. Operators stay at their stations and the product comes to them — the "goods-to-person" principle reduces walking distance, the main time loss in picking.
- Ergonomics and safety. Repetitive lifting and forklift-congested routes are eliminated.
- Predictability. Flow becomes measurable: you know exactly how many units pass a point and where the bottlenecks are.
- Energy efficiency. Modern integrated-motor roller conveyors run only the active zones, consuming energy only when actually moving products.
The main types of conveyor
Gravity roller conveyors
The simplest form: free rollers on a slightly inclined frame, over which products slide under their own weight. Cheap and energy-free, they suit short routes, manual accumulation zones or packing. Their limit is the lack of control: you cannot regulate speed or selectively stop products.
Driven roller conveyors (MDR / RollerDrive)
An integrated-motor roller (MDR) contains a low-voltage electric motor that drives the adjacent rollers. Interroll popularised this technology under the name RollerDrive — 24V rollers that power modular conveyors with zero-pressure accumulation. They are quiet, energy-efficient and ideal for both new buildings and retrofits because they configure zone by zone. Modular product-conveyor platforms — such as those from Interroll — are built on this principle.
Belt conveyors
A continuous belt carries small, irregular or soft-packaged products (envelopes, bags, items without a rigid base) and works well on inclines and level changes. They are essential in eCommerce and courier operations, where parcel variety is high.
Chain and pallet conveyors
For heavy loads — pallets, containers, large units — chain conveyors or heavy-duty rollers rated for high tonnage are used. These form the pallet flow between receiving, storage and shipping.
Spiral conveyors
A spiral conveyor moves products between height levels on a compact helical path, saving space compared to long inclined ramps. It is the right solution for multi-level operating buildings or mezzanines.
The key components of a system
Beyond the transport sections, a complete system includes:
- Diverters and branch points — route products to different paths (to picking, to sorting, to shipping).
- Accumulation zones — controlled queues that synchronise flow with the pace of the workstations.
- Sensors and scanners — read barcodes or dimensions and trigger routing decisions.
- The control system — a WCS (Warehouse Control System) that coordinates motors, sensors and diverters in real time. At Interroll, this role is covered by ConveyorControl-type solutions.
- Workstations — picking, packing or inspection points where the operator interacts with the product delivered by the conveyor.
How to choose the right system
The decision is built on a few objective parameters:
- Product profile. Size, weight, shape and packaging determine whether you need rollers, belt or a combination. A small, light SKU calls for a different solution than a bulky parcel.
- Target throughput. The number of units per hour sets the speed, width and degree of accumulation. This is also where you decide whether you need an automated sorting loop.
- Available space. A greenfield project allows optimal design from scratch; a retrofit requires adapting to existing infrastructure, often in phases.
- Software integration. How "smart" the flow must be — from simple transport to dynamic routing commanded by WMS/WCS.
- Energy efficiency and maintenance. Integrated-motor roller conveyors reduce consumption and long-term maintenance costs.
Integration with sorting and software
A conveyor does not work in isolation. At high throughput, the flow usually ends in a sorter that distributes parcels to destinations — courier routes, stores, lanes. The most common one for mixed parcels is the cross-belt sorter; we explain in detail how a cross-belt sorter works in a dedicated article.
Above the equipment sits the software. The WMS manages inventory and orders; the WCS translates those orders into physical movements. Correctly integrating these two layers — covered on the software and integration page — is the difference between a conveyor that just transports and one that orchestrates the whole operation.
Conveyors in Romanian warehouse automation
For operators in Romania, conveyor systems are usually the first concrete step toward automation: they have a reasonable entry cost, a clear ROI and can be expanded in stages. A local integrator designs the flow from the operation's real data, integrates platforms from established vendors such as Interroll, and handles installation, programming and maintenance. For an overview of the steps, see the guide on warehouse automation in Romania.
A well-designed conveyor system is not just about moving boxes faster — it is the foundation on which a predictable, scalable and efficient warehouse is built.
