Voith Expands eVenFilm Portfolio With High-Performance eVenFilm Pro Roll Cover

Voith has released the eVenFilm Pro, a high-performance rubber film press roll cover engineered for the sizing and coating sections of the paper production ecosystem. This component is designed to manage uniform starch applications across paper and board manufacturing lines experiencing severe operating conditions and high thermal loads.

Technical Mechanisms of the Sizing and Coating Process
In paper and board manufacturing, the film press applies a thin, controlled starch coating directly to the sheet surface, a step that determines final surface properties, printability, and material strength. This process places significant mechanical stress on roll covers. To address these demands, the newly developed rubber roll cover incorporates an enhanced polymer matrix design alongside an upgraded modular fiber and filler concept. These structural material adjustments provide resistance against mechanical wear and allow the component to function effectively in environments utilizing highly abrasive starch applications.

Polymer Matrix Enhancements for Water Permeation Resistance
Roll covers operating in harsh industrial environments frequently degrade due to continuous water permeation, a mechanism that causes cover debonding, underlying roll corrosion, and subsequent machinery failure. To address this vulnerability within advanced coating technology, the roll cover engineering includes an integrated safety module designed to significantly reduce fluid permeation rates. The customized material composition is structured to withstand continuous exposure to starch temperatures exceeding 60 degrees Celsius, as well as increased line loads in the press nip. The cover also maintains structural and operational stability on rolls that lack active cooling systems during the initial start-up phase. By tailoring the specific fiber and filler configuration to individual machine setups, the component aligns with precise production parameters to extend component lifespan, reduce unexpected maintenance shutdowns, and maintain predictable runability.

Additional Context:
This section details technical specifications and competitive benchmarking not included in the original product announcement

Within the global paper machinery sector, high-performance roll covers for film presses are primarily evaluated on hardness stability under thermal load, abrasion resistance, and moisture transmission rates. Voith competes directly with manufacturers such as Valmet and Andritz, which produce comparable multi-layer composite structures and advanced polyurethane or specialized rubber covers designed for the sizing section. Standard industry benchmarks dictate that roll covers must resist changes in hardness, typically measured in Pusey & Jones (P&J), when subjected to constant high-temperature starch. While standard rubber covers often experience accelerated degradation in these environments compared to newer polyurethane alternatives, advanced polymer matrices integrated with specialized filler materials bridge this performance gap. This composite approach represents the industry standard for reducing water permeation, extending the operational intervals between necessary roll regrinding procedures, and preventing moisture-induced core corrosion under extreme nip pressures.

Edited by Natania Lyngdoh, Induportals editor, assisted by AI.

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