Press technology improves paper machine runnability

Voith and Wuzhou Specialty Paper have successfully commissioned PM 19, the first paper machine worldwide to operate with a press system featuring a center belt configuration. The installation marks the transition of this press concept from development to commercial application.

Context of the cooperation
The collaboration builds on a long-standing partnership between Voith and Wuzhou Specialty Paper, focused on improving the performance of high-speed paper machines.

A key operational challenge in conventional press sections is the open-draw threading at the center roll. This configuration often leads to instability during threading, increased risk of web breaks, and higher mechanical stress on components such as doctor blades and roll surfaces.

Addressing these issues required a redesign of the press concept to ensure continuous web support and more stable operation under demanding production conditions.

Technical solution and system design
The installed solution introduces a press configuration that enables closed full-width web threading from the press section directly into the drying section. By eliminating the open draw at the center roll, the system maintains continuous support of the paper web throughout the process.

This design change reduces:

Operational feedback from PM 19 indicates improved threading reliability and more stable web runnability. The reduction in mechanical wear also contributes to extended service life for doctor blades and roll surfaces.

Integrated system delivery and implementation
For PM 19, Voith delivered a complete system package tailored to the machine’s operational requirements. The scope included surface treatment, quality control, machine control and stabilisation systems, as well as approach flow components and start-up materials.

The integration of these subsystems ensured compatibility across the production line, from stock preparation to reel. On-site support during commissioning facilitated a smooth transition to stable production.

This system-level approach reduced commissioning risks and enabled early achievement of consistent operating conditions.

Applications and operational impact
The solution is designed for high-speed paper production environments where stable web handling is critical to productivity and product quality.

Key operational improvements observed include:

By maintaining continuous web support, the press system addresses a long-standing limitation in conventional press designs.

Results and technical significance
The successful start-up of PM 19 demonstrates the practical viability of the new press configuration under industrial conditions. Stable production and consistent web handling confirm the effectiveness of the design in reducing operational risks.

The project also illustrates the role of integrated system delivery in complex industrial installations, where coordination between mechanical, control and process components is essential.

This implementation establishes a reference for future high-performance paper machines requiring improved runnability, safety and component durability.

Edited by an industrial journalist, Lekshman Ramdas, with AI assistance.

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