ACA Permi
Real-time air permeability and porosity measurement
ACA Permi is your go-to solution for real-time air permeability and porosity measurement in the paper, board, nonwoven, and film industries. Whether you’re producing sack kraft, filter papers, or battery separator films, Permi helps you keep things under control—before small issues become big ones.
Continuous inline measurement
High sensitivity and repeatability
Easy integration to production lines
Supports production efficiency
Better quality, less waste
Early detection of process changes lets you react fast, reduce rejects, and hit your quality targets more consistently.
Cost savings
Optimize raw material usage and reduce energy consumption thanks to precise porosity feedback and refining control.
More speed, less downtime
Shorter grade change times and improved runnability mean you can crank up the production pace without sacrificing control.
Fewer lab tests, more insight
Get continuous data directly from the process – calibrated to match Bendtsen, Gurley, or Coresta standards with excellent correlation.
Trusted by
Key application areas
Paper & Board
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Up to 80% of coating quality is determined by the properties of the base paper. ACA Permi enables real-time monitoring and control of base paper porosity and uniformity – helping to improve coating performance and significantly speed up grade changes.
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Uniform roll and sheet formation is essential for excellent print quality. Since formation and air permeability are closely linked, ACA Permi helps optimize both in real time—improving runnability and accelerating grade changes.
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Air permeability is the single most critical property in sack kraft paper. If it is too low, the sack won’t breathe during filling; if too high, strength may suffer. ACA Permi ensures optimal porosity to balance airflow and mechanical strength.
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High strength in kraft paper is achieved through refining, which is directly linked to porosity. ACA Permi enables real-time monitoring of porosity to optimize refining processes. Customers report less variation, improved strength, and reduced energy costs.
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Porosity affects key properties such as tar levels, taste, combustion temperature, and filtration. ACA Permi maintains air permeability (e.g. 30–50 CU) at target levels efficiently, saving both time and material during grade changes.
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Uniformity is critical for impregnation and consistent image quality. ACA Permi provides online control of base sheet air permeability, helping to improve the quality of the end product in decorative laminates.
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Filtration performance depends heavily on media consistency. ACA Permi performs roll-to-roll porosity profiling and detects even the smallest variations. It measures over 10,000 points per roll in real time, ensuring consistent quality and saving time during production.
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Strength and visual appearance in packaging board rely on consistent formation and porosity. Air permeability correlates directly with board strength and printability. ACA Permi supports accurate quality control and helps reduce energy use during refining.
Nonwovens
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Waste from broke is costly, especially in glassfiber production. ACA Permi shortens grade change times by 15–50% through real-time control and improves uniformity in critical end-use applications like filtration.
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High-performance nonwovens require a consistent structure throughout the roll. ACA Permi analyzes more than 10,000 data points per roll to ensure advanced quality assurance, which is essential for stable converting and end-use performance.
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Filter efficiency depends directly on the consistency of the media. ACA Permi ensures correct air permeability and pressure drop across the entire roll, while also helping to speed up grade changes and enhance overall filtration performance.
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Lightweight and strong nonwovens require stable structural quality. ACA Permi detects permeability variations that can affect strength, ensuring better durability and reduced variability in the end-use application.
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Additives used in production can clog felts and reduce the life of machine clothing. ACA Permi enables early detection of airflow blockages in felts and wires, helping to extend their service life. Customers report fast return on investment, especially in airlaid processes.
Films & Engineered Materials
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Air permeability—typically measured in Gurley units—is a key property of battery separator films. Uniform porosity is essential for long cycle life and electrical safety. ACA Permi measures Gurley-equivalent values inline with high correlation and provides real-time roll profiling with 5,000 to 10,000 data points per roll.
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Uniform breathability is crucial in applications such as diapers and food packaging. ACA Permi offers continuous control over breathability and roll consistency, which enhances both product performance and manufacturing efficiency.
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Membrane films are used in high-end filtration applications, where quality must be precise. ACA Permi monitors air permeability roll-to-roll to ensure consistent membrane efficiency. It helps keep specifications within target and reduces time and costs during grade changes.
Words from ACA Permi users
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“Without an online porosity gauge, we couldn’t detect the unstable porosity caused by refining, broke, or fines. Permi made all the difference.”
— Stora Enso
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“With Permi, we’ve reduced energy consumption by 10%. Operators follow porosity feedback continuously to adjust refining.”
— Ahlstrom
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“Permi helped us cut grade change time by 15–20%. That’s a real improvement in productivity.”
— Mondi
Alongside our industry-leading analyzers, we offer a full range of services—from installation and configuration to long-term maintenance and modernization. Whether you’re starting up a new line or optimizing an existing one, our team is here to help.