GBPI N600P – Paper & Paperboard Air Permeability Tester (Bendtsen & Gurley)
- High-precision paper air permeability tester for specialty papers, packaging boards, and filter papers
- Full testing compliance with ISO 5636-3, ISO 5636-5, GB/T 458, TAPPI T460, and TAPPI T536
- Dual test methods: Bendtsen air permeance method and standardized Gurley pneumatic timing method
- Wide air permeance measurement range from 0.1 to 10 μm/(Pa·s) with resolution of 0.001 μm/(Pa·s)
- Micro-differential pressure regulation from 0 to 5 kPa with ultra-sensitive accuracy of ±0.25% F.S.
- Interchangeable precision test heads for 6.42 cm2 and 10.0 cm2 test areas
- Touchscreen interface with automated unit conversion (μm/(Pa·s), mL/min, Gurley seconds) and integrated USB data export
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The GBPI N600P is a state-of-the-art laboratory paper air permeability tester engineered to determine the air permeance, gaseous flow resistance, and surface porosity of specialty papers, paperboards, kraft packaging liners, cement sack papers, cigarette papers, and industrial filter sheets. Designed in strict conformity with premier international pulp and paper standards including ISO 5636-3 (paper and board — determination of air permeance — Bendtsen method), ISO 5636-5 (Gurley method), GB/T 458, and TAPPI T460, this computerized instrument replaces traditional mercury and oil-based manometers with high-stability electronic pressure sensors.
In paper manufacturing and converting, air permeability is a decisive structural parameter that governs ink absorption in gravure and flexographic printing, adhesive penetration in corrugated lamination, and de-aeration efficiency during high-speed automated packaging filling (such as cement and flour valve bags). If paper porosity is overly dense, filling bags can balloon and burst; conversely, if porosity is too porous, fine particulate powders sift through the fibrous matrix. Operating as a computerized paper air permeability tester, the GBPI N600P accurately quantifies air passage through a defined specimen area under an automated, highly stable pressure gradient.
Dual Analytical Principles: Bendtsen & Gurley Integration
The instrument seamlessly accommodates both major international testing philosophies: the Bendtsen constant-pressure air flow method (reporting air permeance in μm/(Pa·s) or flow rate in mL/min) and the Gurley transit time method (measuring the seconds required for 100 mL of air to permeate the sample). A closed-loop electronic regulator maintains differential pressure with 0.001 kPa precision, eliminating pneumatic oscillation.
Interchangeable Precision Test Orifices
To support diverse paper grades ranging from dense glassine and release liners to highly porous filter media, the N600P features interchangeable pneumatic clamping heads matching standard 6.42 cm² (Gurley standard) and 10.0 cm² (Bendtsen standard) effective test areas with airtight peripheral sealing.
Equipped with a vivid touchscreen display, automated specimen clamping, and instantaneous unit conversion, the N600P delivers reliable quality control essential for paper mills, packaging converters, and commercial printing houses.
GBPI N600P Paper & Paperboard Air Permeability Tester – Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Test Principle | Bendtsen Air Permeance & Gurley Differential Pressure Air Transit Timing |
| Applicable Standards | ISO 5636-3, ISO 5636-5, GB/T 458, TAPPI T460, TAPPI T536 |
| Air Permeance Range | 0.1 ~ 10 μm/(Pa·s) (Continuously variable electronic flow calculation) |
| Measurement Resolution | 0.001 μm/(Pa·s) |
| Differential Pressure Range | 0 ~ 5 kPa (Standard calibrated pressure: 1.47 kPa Bendtsen / 1.215 kPa Gurley) |
| Pressure Resolution & Accuracy | Resolution: 0.001 kPa; Accuracy: ±0.25% F.S. |
| Effective Testing Areas | Standard 6.42 cm² (Φ28.6 mm) or 10.0 cm² (Φ35.7 mm) interchangeable heads |
| Specimen Dimensions | > 50 mm × 50 mm (Accommodates paper sheets, board specimens, and rolls) |
| Supported Measurement Units | μm/(Pa·s), mL/min (Bendtsen), s/100 mL (Gurley second) |
| Overall Dimensions | 450 mm (L) × 400 mm (W) × 300 mm (H) |
| Instrument Net Weight | Approximately 22 kg |
| Power Supply & Rating | 110 ~ 250 VAC, 50/60 Hz; Total Power: 100 W |
Key Features & Engineering Highlights
- Dual Standard Method Compliance: Directly supports both Bendtsen air permeance (ISO 5636-3) and Gurley timing (ISO 5636-5) methods.
- Broad Porosity Dynamic Range: Characterizes dense release liners, printing papers, and permeable multiwall sack boards.
- Ultra-High Resolution: Air permeance resolution down to 0.001 μm/(Pa·s) and pressure control resolution of 0.001 kPa.
- Pneumatic Clamping Stability: Eliminates manual lever force variations, ensuring uniform peripheral ring clamping without paper pinching.
- Instant Multi-Unit Conversion: Automatically converts and displays test results in μm/(Pa·s), mL/min, and Gurley seconds.
- User-Friendly Touchscreen: Intuitive menus for test parameter configuration, automated zero-point calibration, and real-time graphics.
- Comprehensive Data Management: Stores hundreds of test runs with onboard statistics (average, max, min, standard deviation) and USB export.
Standard Package & Accessories
| Item Description | Quantity |
|---|---|
| GBPI N600P Paper Air Permeability Tester Mainframe | 1 Unit |
| Standard Circular Test Head (6.42 cm² Gurley Aperture) | 1 Set |
| Bendtsen Test Head (10.0 cm² Aperture) | 1 Set |
| Pneumatic Air Regulator & Connection Tube Assembly | 1 Set |
| Power Supply Cable & Safety Ground Lead | 1 Set |
| Operating Manual & Calibration Certificate | 1 Set |
Target Industry Applications
Industrial Multiwall Sack Papers
Testing air permeability of porous kraft paper used for packaging cement, flour, chemicals, and agricultural seeds to ensure fast air venting during high-speed filling.
Printing & Writing Papers
Monitoring porosity of offset, gravure, and flexographic printing papers to control ink penetration rates, drying times, and show-through.
Cigarette & Filter Plug Papers
Evaluating air permeability of highly porous tipping paper, cigarette plug wrap, and ventilated filter papers under ISO standards.
Automotive & Industrial Filter Papers
Determining airflow resistance and face velocity of oil, fuel, and air intake filter papers used in vehicular filtration systems.