Paper & Packaging
Smoothness & Porosity Tester (Bendtsen Type)
Surface smoothness and air permeance — Bendtsen air-flow method
The Smoothness & Porosity Tester (Bendtsen Type) is used for evaluating the smoothness (surface roughness) and air permeance (porosity) of paper, paperboard and other sheet materials. It operates on the Bendtsen air-flow method, where air is allowed to pass between a defined area and the surface of the test piece under a specified pressure. The amount of air flow is measured and indicates the smoothness or porosity of the material. The instrument is widely used in paper mills, packaging industries, printing units and quality control laboratories.
Technical specifications
Test material
Paper, paperboard, liner, tissue, printing paper and similar sheet materials
Test principle
Bendtsen air-flow method
Smoothness / roughness range
Approx. 5–3000 mL/min with variable-area flow measurement
Porosity / air permeance
Bendtsen method; air flow measured through a defined test area
Flow ranges
5–150 mL/min, 50–500 mL/min and 300–3000 mL/min
Measuring head pressure
Approx. 98 kPa for roughness/smoothness measurement
Measuring head weight
267 ± 0.5 g
Test area for porosity
Approx. 10 cm²
Air supply
Built-in / external oil-free compressed-air source, as applicable
Pressure regulation
Adjustable pressure regulation system
Flow measurement
Precision variable-area flow meters / rotameters
Display
Direct reading on calibrated flow scale
Test modes
Smoothness/roughness and porosity/air permeance
Approx. power
50 W (configuration dependent)
Construction
Robust laboratory-grade construction
Accessories
Smoothness measuring head, porosity measuring head, flow tubes, pressure-regulating system and necessary fittings
Power supply
220–240 V AC, single phase, 50 Hz
Applications
Paper and paperboard
Liner and packaging board
Tissue and printing paper
Foils and other sheet materials
Quality control, R&D and paper/packaging laboratories
Frequently asked questions
What is the Smoothness & Porosity Tester (Bendtsen Type)?+
The Smoothness & Porosity Tester (Bendtsen Type) is used for evaluating the smoothness (surface roughness) and air permeance (porosity) of paper, paperboard and other sheet materials. It operates on the Bendtsen air-flow method, where air is allowed to pass between a defined area and the surface of the test piece under a specified pressure. The amount of air flow is measured and indicates the smoothness or porosity of the material. The instrument is widely used in paper mills, packaging industries, printing units and quality control laboratories.
What standards does the Smoothness & Porosity Tester (Bendtsen Type) comply with?+
The Smoothness & Porosity Tester (Bendtsen Type) complies with the following standards: ISO 8791-2:2013 – Bendtsen Smoothness/Roughness, ISO 5636-3:2013 – Bendtsen Air Permeance, BS 4420, SCAN P21, SCAN P60, TAPPI UM 535.
What are the key features?+
- Accurate and reliable test results with direct reading on calibrated flow scale
- Three flow ranges: 5–150, 50–500 and 300–3000 mL/min
- Precise pressure control system with adjustable pressure regulation
- Suitable for a wide range of sheet materials
- Simple operation with rugged, laboratory-grade construction
- Ideal for quality control and R&D laboratories
- Low maintenance and long service life
Where can I buy the Smoothness & Porosity Tester (Bendtsen Type) in India?+
The Smoothness & Porosity Tester (Bendtsen Type) is manufactured and sold by Techno India, based in Roorkee, Uttarakhand. Contact us at sales@techno-india.com or call 08077928706 for pricing and delivery. We provide installation, calibration and AMC across India.
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