TMI Bekk Smoothness Tester Model 58-05-00-0002

Overview

The TMI Bekk Smoothness Tester Model 58-05-00-0002 is a precision-engineered instrument designed for quantitative assessment of surface smoothness in paper, paperboard, and corrugated packaging substrates. It operates on the fundamental Bekk principle—a standardized air-leakage method where smoothness is determined by measuring the time required for a defined volume of air to pass between a flat glass anvil and the test specimen under controlled pressure (typically 100 kPa). Unlike legacy mercury-column systems, this instrument employs a high-stability pressure transducer and microprocessor-based timing circuitry to deliver repeatable, traceable, and operator-independent results. Its design eliminates hazardous mercury use while maintaining full alignment with international test protocols, making it suitable for QC laboratories operating under GLP or ISO/IEC 17025-accredited environments.

Key Features

• Microprocessor-controlled measurement cycle with automatic start/stop logic and real-time digital display of smoothness duration (in seconds)
• Mercury-free pneumatic system compliant with RoHS and OSHA occupational safety requirements
• Open-frame mechanical architecture enabling rapid specimen loading, visual alignment verification, and easy maintenance access
• Optimized airflow path geometry and calibrated orifice design ensuring minimal turbulence and high inter-laboratory reproducibility
• One-button operation: after specimen placement and chamber closure, pressing START initiates pressure application and timing sequence without manual intervention
• Short-duration measurement capability—even for ultra-smooth grades (e.g., coated fine papers or metallized films)—with resolution down to 0.1 s across the full 0–12,000 s range
• Robust aluminum-and-steel construction with vibration-dampening base for stable operation in shared lab spaces

Sample Compatibility & Compliance

The tester accommodates standard sheet specimens measuring 50 mm × 50 mm (or 2″ × 2″) as specified in ISO 5627 and TAPPI T 479 om-17. It supports both single-side and double-side testing configurations through optional sample clamping kits. The instrument is validated for use with grammages ranging from 40 g/m² (newsprint) to 600 g/m² (heavy-duty solid bleached sulfate board). All calibration procedures follow NIST-traceable reference standards, and built-in diagnostic routines verify pressure integrity and timer accuracy prior to each test cycle. Regulatory compliance includes full adherence to ISO 5627:2013, GB/T 456–1989 (equivalent to ISO 5627:1978), and TAPPI T 479 om-17. Documentation packages support audit readiness for FDA-regulated packaging validation (21 CFR Part 11–compliant data handling when paired with optional RS232 interface and validated software).

Software & Data Management

While the base unit operates as a stand-alone analog-digital hybrid system, optional connectivity enables integration into centralized QA workflows. The RS232 serial interface supports bidirectional communication with LIMS or custom Excel-based tracking tools using ASCII protocol. When used with the dedicated Digi-Bekk printer (optional accessory), hard-copy reports include date/time stamp, operator ID, sample ID, test duration, and pass/fail status relative to user-defined specification limits. For regulated environments, firmware versioning, calibration history logs, and electronic signature support are available via TMI’s certified LabLink™ software suite—fully compliant with 21 CFR Part 11 requirements for audit trails, user access controls, and data integrity assurance.

Applications

This Bekk smoothness tester serves critical functions across packaging R&D, production QC, and supplier qualification processes. Typical use cases include evaluating calendering efficiency during paper machine operation; verifying surface uniformity of inkjet-receptive coatings; assessing embossing or laminating impact on substrate tactile properties; benchmarking competitive board grades for folding carton manufacturability; and supporting ISTA/ASTM D4169 transport simulation studies where surface friction correlates directly with pallet stability and case erector performance. In food and pharmaceutical packaging labs, it contributes to material release testing per USP and EU Pharmacopoeia Chapter 3.1, particularly for blister foil and label stock qualification.

FAQ

What standards does the TMI Bekk Smoothness Tester comply with?
ISO 5627:2013, GB/T 456–1989, and TAPPI T 479 om-17.
Is mercury used in the pressure system?
No—this instrument uses a solid-state pressure transducer and sealed air chamber, eliminating all mercury-related safety and disposal concerns.
Can test data be exported to a computer or LIMS?
Yes, via optional RS232 cable and compatible terminal software or LabLink™ platform.
What is the minimum and maximum measurable smoothness value?
The instrument measures from 0 to 12,000 seconds, covering uncoated newsprint (10,000 s).
Does the unit require annual recalibration?
Yes—TMI recommends annual verification against NIST-traceable reference standards, with full calibration certificate documentation provided upon service.