High-speed coating and converting lines rely on precise thermal control to maintain product quality and machine efficiency.
OEMs must deliver consistent heat across a fast-moving web while maintaining tight control over drying, curing and material behaviour. Even small fluctuations in heat input can quickly create defects, reduce efficiency or limit machine speed.
To achieve reliable performance, machine designers must treat heating as a core part of the process, not just a supporting function.
Coating and converting lines use electric heating at multiple stages, each with different technical demands and process sensitivities.
In coating systems, heat removes solvents or water while the web moves continuously through the dryer. The drying profile directly influences coating behaviour. If heat input varies, the process can produce uneven coating weight, surface defects or instability in the coating layer.
Operators must maintain consistent heat across the web width and along the dryer length. Any variation will show up immediately in the finished product.
Upstream processes such as adhesive preparation and resin production depend heavily on temperature stability.
Engineers use heat to control viscosity, reaction rates and material consistency. If temperature drifts, the system produces variations in adhesive properties, which then affect coating performance downstream.
Stable and repeatable heating ensures that materials behave consistently before they reach the coating stage.
Laminating and embossing systems rely on heated rollers to activate adhesives or modify surface characteristics.
The roll surface must remain uniform in temperature. Even small variations across the roll can lead to uneven bonding or visible defects.
These applications demand precise and responsive heating control, especially when machine speed or load conditions change.
Coating and converting lines operate at high speeds with limited tolerance for variation.
As the web moves through the machine, heat drives evaporation, curing and material transformation. If heat input fluctuates, it alters drying rates and material behaviour in real time.
Because the process runs continuously, it cannot easily recover from disturbances. A small instability can affect a large volume of product before operators detect the issue.
Consistent heat delivery therefore plays a critical role in maintaining both product quality and machine efficiency.
Most coating and converting systems use resistive heaters, infrared elements or heated rolls. Each of these loads responds differently to power delivery.
Engineers often use burst firing for resistive heaters because it provides stable average power and high efficiency. However, some applications require faster or more precise control.
Infrared heating responds quickly to power changes, while heated rolls demand tight temperature uniformity. In these cases, the control strategy must deliver smooth and stable power without introducing thermal fluctuation.
Selecting the correct firing mode ensures that heat enters the process in a controlled and predictable way.
Coating lines often run continuously for long production cycles. Any interruption can lead to lost output, material waste and machine downtime.
Many traditional systems rely on mechanical contactors to switch heaters. These devices degrade over time due to frequent switching and electrical arcing. As wear increases, switching becomes unreliable and failures eventually occur.
Solid-state power controllers remove this mechanical failure point and provide consistent switching performance over time.
Modern systems also include early fault detection, which alerts operators to heater issues before they escalate.
This allows maintenance teams to intervene early, reducing the risk of unexpected shutdowns and helping maintain continuous production.
Modern OEM machines require more than stable heating, they require visibility, control and integration.
Power controllers now provide real-time data, allowing engineers to monitor heater performance, load conditions and system status during operation. With remote access, operators can view this data without opening control panels or interrupting production.
Energy consumption plays a significant role, particularly in large drying systems.
Integrated energy monitoring and totalisation allow machine builders and end users to track usage, identify inefficiencies and improve overall system performance.
Power controllers that support Profinet and Profibus connect directly to PLC systems, enabling centralised monitoring and coordinated control.
This simplifies diagnostics, improves machine transparency and ensures that heating systems operate as part of a fully integrated process.
When OEMs combine stable power delivery, correct control strategy and integrated diagnostics, they create machines that perform reliably under demanding conditions.
This approach enables:
In high-speed web processes, where small variations can quickly escalate, this level of control becomes essential.
In coating and converting applications, the power control system must match the process, the heating method and the machine design.
Some systems require stable burst firing for drying sections, while others need fast, responsive control for infrared heating or precise temperature control for heated rollers.
CD Automation’s thyristor power controllers, including REVO S, REVO C and REVO-PC, support these requirements with flexible firing modes and advanced functionality.
These systems provide accurate and stable power delivery, early fault detection, energy monitoring, real-time visibility and seamless integration with industrial control systems.
This allows OEMs to design equipment that delivers consistent performance, improved reliability and better overall process control.
If you design coating or converting equipment and want to improve heating stability, reliability or system integration, CD Automation can help you select the right power control solution for your application.
Further application information can be found on our Pulp, Paper, Coatings & Printing Industries page.
Or contact our engineering team to assess your current heating control strategy.
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