Sheets Unlimited enhances corrugated board warp control and production efficiency with Valmet IQ Quality Control System
13/08/2026 Valmet Automation Ltd
Valmet will supply a Valmet IQ Quality Control System for corrugator to Sheets Unlimited, one of the largest independent corrugated box manufacturers in the Pacific Northwest, located in Washington, USA. The system will address key quality challenges, most notably moisture imbalance which is the root cause of warp, to improve board quality, production efficiency, and overall converting performance.
For independent sheet feeders like Sheets Unlimited who source roll stock from multiple mills, it is critical to ensure consistent quality and efficient production. Variations in paper grades, moisture levels, and fiber characteristics create unpredictable warp behavior that standard corrugator controls cannot fully manage, affecting converting performance, customer satisfaction, and material waste.
“We had the opportunity to see Valmet’s warp control solution in operation at another manufacturer in Europe. What stands out is its ability to address the root cause of warp: moisture imbalance. Based on the strong feedback from users and our own evaluation, we are confident in the value it brings to our operations. With this solution, we are well positioned to reduce variability, improve converting performance, and deliver products of even higher quality to both our internal and external customers,” says Krist Leland, Director of Manufacturing, Sheets Unlimited.
“With Valmet IQ, the customer will benefit from improved process stability, more uniform product quality, and reduced operator workload. The system’s precise moisture and warp measurements, combined with advanced automation, help minimize material waste and improve resource efficiency, while supporting sustainability targets. This project demonstrates how intelligent automation can enable more streamlined operations and enhanced overall performance,” says David Maddux, Board Converting Automation Sales Manager, North America, Automation Solutions, Valmet.
The delivery includes combined paper temperature, moisture balance, total moisture and warp control, utilizing an interface to the existing state-of-the-art corrugator heating elements. It also incorporates Valmet’s proven moisture measurement technologies and automatic moisturizing solution.
The order was included in Valmet’s orders received in the second quarter of 2026. The value of the order will not be disclosed. The delivery is scheduled for the fourth quarter of 2026, with commissioning planned for January 2027.
Delivery's technical information
The delivery consists of Valmet IQ Warp Measurement, Valmet IQ Moisturizer, Valmet IQ Multipoint Moisture, and Microwave moisture measurement, integrated with automatic closed-loop controls.
Valmet IQ Quality Control System for corrugator combines online moisture, temperature, and warp measurements. It is used to control all corrugated board types to reduce sheet warping, improve bonding, and thus maximize corrugated board box plant performance.
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