ACA Permi

Air Permeability / Pressure Drop

Tool for stable process
& excellent roll quality

ACA Permi is the best tool to balance your process stability and product quality. On-line air permeability measurement provided by PERMI monitors your process and quality factors and keeps you on the safe side.

Payback in weeks

Our customers have reported 15 % – 50 % faster grade change times when controlling the roll quality with ACA Permi.

Grade change time = loss of production. Grade change with ACA Permi = minimize the production loss, maximize the ROI

Payback time is calculated in weeks! Contact us for detailed information.

Good or bad roll?

Laboratory measurement takes 5-10 points from produced roll and assumes that the rest of the roll is the same. ACA Permi measures realtime >10 000 points from produced roll and makes sophisticated analysis if the roll is good or bad with high statistical confidence.

Read more: Good or bad roll

Benefits of ACA Permi

Stable process & excellent roll quality

When the input signal of ACA Permi is stable, also the process is stable and runnability very good.

When the stabilized air permeability / pressure drop is on the right level the roll quality is excellent.

Our customers are reporting for example:

50 % faster grade changes

25 % speed increase

15 % production rate increase

Reliable data

Unique and tailored measurement head design provides excellent contact with the web and eliminates the leakage air, dust and other disturbances.

Generated stable air flow leads to very high correlation (> 0,95 R2) between ACA Permi and any lab standard (Gurley, Bendtsen, Coresta, delta P…)

Roll to roll data and color maps with high statistical confidence to identify uniform and non-uniform rolls.

User-friendliness

Wide measurement range with one single calibration no need to change parameters or physical parts for various grades.

Automatic cleaning cycle and smart construction for easy maintenance and installation. Measurement signal compatible to mill-wide systems and cloud services automatic process control possible.

Remote services, yearly maintenances, installation, spare parts and data services available. Read more!

Product Info

  • Measurement principle
    • Continuous Air flow (vacuum or blown air)
  • Measurement configuration
    • Fixed point or scanning (max width 4.2m)
  • Output type
    • 2-wire, three outputs, 4 – 20mA & Ethernet, ACA Cloud compatible
  • Delivery package
    • Measurement unit, control unit, scanner (optional), user manual
  • Measurement frequency
    • Less than 0.2 sec
  • Measurement ranges:
    • 0,02 – 12 000 l/m2/s
    • 0,02 – 6000 sec (Gurley)
    • 1 – 50 000 ml/min (Bendtsen)
    • 1 – 40 000 Cu (Coresta)
    • 1 – 2 500 Pa (Pressure Drop)
    • Any other method available
  • Weight
    • Measurement unit 13kg, control unit 20 kg
  • ACA Services
    • Installation
    • Maintenances
    • Remote troubleshooting
    • Data services
    • Spare parts

Contact us: service@aca.fi

Best applications Paper & Board

Coated base paper

80 % of the coating quality is dependent on base paper

Base paper uniformity can be controlled and improved by ACA Permi

Grade changes can be speeded up significantly

Uncoated printing paper

Roll / sheet uniformity is a key for excellent print result

Formation and air permeability are connected and can be controlled and improved by ACA Permi

Grade changes can be speeded up significantly

Sack paper

Optimal air permeability is the most important single parameter in sack paper

If permeability is too low the air cannot pass the walls of a paper when pouring powder into a sack. If the porosity is too high, lack of strengths may appear, and for instance, a sack filled with heavy powder can break.

Kraft paper

High strengths are generated by intensive refining in kraft papers

Refiners can be connected to follow realtime porosity provided by ACA Permi.

Customers are reporting less fluctuations, higher strengths and cost savings via reduced refining energy loads and faster grade changes.

Cigarette paper

Optimal air permeability is the most important single parameter in cigarette paper

The air permeability has an influence on the tar level, taste of cigarettes, dust content and on temperature of the burning process. Air must also pass the walls of the paper to dilute and cool the smoke of a cigarette.

Easy and fast online measurement provided by ACA Permi helps to keep the air permeability of cigarette paper on the correct level (for example 30-50 CU) and save time and money in grade changes.

Décor paper

Décor papers are impregnated for outdoor use, at the same time the printed image must be even and opaque.

The uniformity of the base roll is a key for high end-use quality.

Online air permeability control of the base substrate is the best tool to control and improve the end-product quality

Filter paper

Filtration efficiency is highly depended on the consistency of the filter media.

Roll to roll Air permeability is the best indicator of filter efficiency. ACA Permi measures real-time > 10 000 points from produced roll and makes sophisticated analysis of the filter media quality.

ACA Permi helps to keep the air permeability (or pressure drop) on the correct level as well as saves time and money in grade changes.

Packaging board

Packaging board needs to be strong and visually attractive, so strengths and printed properties are important.

The air permeability level of manufactured packaging board depends on refining and has a good correlation to the board strength. The consistency of the air permeability is linked with formation and provides good indication of the print quality

ACA Permi helps to keep the air permeability (or pressure drop) on the correct level as well as saves time and money in grade changes and refining energy.

Best applications Nonwovens

Glassfiber nonwoven

Disposal of glassfiber nonwovens is difficult and expensive, so minimized production of broke is essential.

ACA Permi speeds up grade changes 15 – 50 % as the manufactures can control the process and quality reali-time during the grade change period.

Online air permeability or pressure drop control improves the product uniformity for critical end-use applications such us glassfiber filter media

Medical and high-end durable nonwovens

High-end nonwoven products such medial textiles and other functional nonwovens are converted for technical end-use and are often very costly performance materials, thus the constant roll quality is very important for further converting steps and end-use

Roll to roll air permeability is the best indicator of constant roll quality. ACA Permi measures real-time > 10 000 points from produced roll and makes sophisticated analysis of structural uniformity of the material.

Nonwoven filter media

Filtration efficiency is highly depended on the consistency of the filter media.

Roll to roll Air permeability is the best indicator of filter efficiency. ACA Permi measures real-time > 10 000 points from produced roll and makes sophisticated analysis of the filter media quality.

ACA Permi helps to keep the air permeability (or pressure drop) on the correct level as well as saves time and money in grade changes.

Spunbond, meltblown, air laid and other nonwovens

Nonwoven material regardless of production technology needs to be light, strong and dimensional stable

Roll to roll air permeability is the best indicator of constant roll quality. ACA Permi measures real-time > 10 000 points from produced roll and makes sophisticated analysis of structural uniformity of the material.

The less variations in air permeability the higher the strength properties

Nonwoven machine clothing (felts, wires)

Use of aids, such as binders, superabsorbents or other inorganic materials in nonwoven manufacturing process may cause quickly built ups on machine wires and lead to poor performance and quality.

Online air flow inspection of the wire / felt is able to define the critical limit of blocking and thus increase the life-time of machine clothing.

Customers are reporting very fast ROI especially in air laid processes

Best applications Films & Engineered materials

Battery separator films (BSF)

Air permeability measured typically as Gurley unit is one of the key characteristics of a battery separator film.

The separator with uniform permeability is essential for the long cycle life of a battery. Variations in permeability will result in uneven current density distribution, which may be a risk for the whole battery.

ACA Permi can measure with very high correlation and real-time the gurley values of the BSF-film during the manufacturing process.

Roll to roll air permeability is the best indicator of BSF roll quality for converting as well as for end-use. ACA Permi measures real-time 5000 – 10 000 points from produced roll and makes sophisticated analysis of the variations in permeability.

Technical textiles, felts and fabrics

Breathable films are used extensively in diapers and food packaging. For the end-use the quality of the film needs to be constant and breathability variations minized.

Roll to roll air permeability is the best indicator of breathability of manufactured roll.  ACA Permi measures real-time 5000 – 10 000 points from produced roll and makes sophisticated analysis of the variations in breathability.

Membrane films

Membrane films are used typically as filter media in high-end filtration applications. The filtration efficiency is highly depended on the consistency of the filter media.

Roll to roll Air permeability is the best indicator of filter efficiency. ACA Permi measures real-time 5000 – 10 000 points from produced membrane film and makes sophisticated analysis of the membrane quality.

ACA Permi helps to keep the air permeability (or pressure drop) on the correct level as well as saves time and money in grade changes.

Proven results & happy customers

Permi is our early-warning-system for any undesired changes in our process"

Permi is a great overall and cost effective measure of web structure"

Our global references

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