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In-Line Robot for Continuous Surface Treatment

An In-Line Robot is integrated directly into the production line and carries out surface treatment while the items move. The robot follows the item and paints or blasts along the way – without stopping operations.

This improves booth utilisation and reduces downtime compared to manual or stationary treatment.

How does an In-Line Robot work?

The system runs continuously without manual intervention. Scanning, programming and synchronisation are handled automatically in sequence – so by the time an item reaches the robot, the programme is already calculated and ready to execute.

Scanning and positioning

A 3D scanning system with four scanners on each side of the line registers the item’s precise dimensions and position and builds a detailed point cloud. The Inropa™ PoseFitter module then compares the point cloud with the item’s CAD model and determines the exact position and orientation in space.

Automatic programming and synchronisation

Scanning data is transferred to the Inropa™ Automatic Programmer, which calculates optimised robot paths and transfers them directly to the robot in real time. The system simultaneously determines the maximum allowable line speed and compensates for positioning deviations of up to 100 mm. The system automatically handles a wide range of item types – including H-beams, I-beams, rectangular profiles, brackets and welded details.

Operation and training

You do not need a dedicated robot programmer on site. In line with our Plug-and-Paint philosophy, the system arrives ready to operate and is built for people with painting experience, as they understand what is required in the actual painting process. Operators learn basic operations in three days, and more advanced programming takes approximately five days of training.

What tasks is the In-Line Robot suited for?

The In-Line Robot is used for both painting and blasting – from spray painting robots applying precise coatings to sandblasting robots removing mill scale and rust.

Painting and coating

Our painting robots apply primers, topcoats, polyurethane and epoxy (including epoxy with glass flakes) directly in the line on structural steel, offshore foundations and wind turbine components. With multiple guns on the same robot, you can switch between materials and colours without interrupting production. An automated paint system in this configuration applies coatings in two- and three-coat systems and ensures consistent quality on every single item. For tasks requiring even coverage on large surfaces, spray painting robots deliver precise and uniform application.

Blasting

Our sandblasting robots remove mill scale, rust and old coatings while the item moves through the treatment zone. The robot covers the entire surface with consistent intensity and the correct blast pressure, producing a consistent surface profile that creates the necessary foundation for a durable coating.

When does an In-Line Robot make sense?

In-Line Robots are best suited for series production with uniform product families in large volumes, where continuous operation is essential. Steel manufacturers producing beams, pipe structures or frames typically see the fastest return on investment.

The system is dimensioned for items up to 16 metres in length, and stable line speed together with consistent item placement help ensure the best result. If your production involves frequent changeovers and significant variation in geometry, a Gantry Robot or Floor-driven Robot may be a more suitable solution.

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Get advice on the In-Line Robot

If you have questions about the In-Line Robot or would like to know more about what the system can do for your production, you are welcome to contact us. We provide advice on solutions specific to your production setup and help you assess whether an In-Line Robot is the right choice – or whether a different robot configuration would better suit your needs.

FAQ

What is an In-Line Robot?

An In-Line Robot is a robot solution integrated directly into the production line that carries out automated surface treatment while the items move. The robot moves in sync with each item and performs painting or blasting continuously, without interrupting operations.

How is an In-Line Robot programmed?

An In-Line Robot is programmed automatically via 3D scanning and automatic generation of robot paths using the Inropa™ Automatic Programmer. Programming time varies depending on item complexity – from under a minute for straightforward profiles to around five minutes for complex structures. Manual programming is only required for geometries that fall outside the automatic system’s capabilities.

What types of surface treatment can an In-Line Robot perform?

An In-Line Robot is primarily used for painting and sandblasting and can be configured for various surface treatment tasks depending on the requirements of the items and the specific production.

Can an In-Line Robot handle different product types on the same line?

An In-Line Robot handles multiple product types on the same line. The scanning system identifies each item individually and automatically generates a dedicated programme, so you can run varied geometries without manual changeovers or stops in production.

How many square metres does an In-Line Robot treat per hour?

Our In-Line systems treat 300-400 square metres per hour depending on the complexity and line speed of the items. The booth operates continuously without downtime for repositioning or programming – the Inropa™ system calculates each programme automatically before the item reaches the robot.