DERUI TESTING DR-ZB206A Bekk-Type Paper and Paperboard Smoothness Tester

Overview

The DERUI TESTING DR-ZB206A Bekk-Type Paper and Paperboard Smoothness Tester is an electromechanical instrument engineered for precise quantification of surface smoothness in paper, board, and corrugated packaging materials. It operates on the internationally standardized Bekk air-leak principle: a defined volume of air is drawn through the interface between a flat glass anvil and the test specimen under controlled vacuum and applied pressure. The time required for a fixed volume of air to pass through this sealed interface—measured in seconds—is directly correlated to the material’s surface topography and compressibility. Unlike manual lever-weight systems, the DR-ZB206A employs a cam-and-spring loading mechanism driven by a synchronous motor, ensuring consistent 100 kPa ±2 kPa clamping force without operator variability. This design enhances repeatability, reduces mechanical hysteresis, and complies with the fundamental requirements of GB/T 456, ISO 8791-2, TAPPI T479, and ASTM D5263 for Bekk smoothness measurement.

Key Features

• Automated range selection and pneumatic control: High-precision differential pressure sensors and microprocessor logic enable real-time recognition of sample smoothness level, automatically selecting the optimal vacuum range (I, II, or III) and corresponding chamber (large or small) to maximize resolution across the full 0–9999 s measurement span.
• Two-sided differential analysis: Integrated dual-mode testing sequence allows sequential measurement of both top and bottom surfaces of a single sheet, with automatic calculation, display, and thermal-print output of the absolute two-side difference (|S_top − S_bottom|), supporting quality assessment of calendered or coated papers.
• Fast-test mode: Reduces total cycle time to ≤130 s for high-smoothness grades (e.g., coated fine papers), accelerating throughput in QC laboratories without compromising compliance with standard pre-compression dwell time (60 s at 100 kPa).
• Oil-free vacuum system: Equipped with a certified imported dry diaphragm vacuum pump—no lubrication required, zero oil vapor contamination, and stable long-term vacuum maintenance across all three pressure bands.
• Human-centered HMI: 7-inch full-color capacitive touchscreen with intuitive bilingual (English/Chinese) GUI, context-sensitive soft keys, and on-screen calibration prompts. All operational parameters—including vacuum setpoints, dwell timing, and result units—are configurable and stored non-volatilely.

Sample Compatibility & Compliance

The DR-ZB206A accommodates standard test specimens measuring ≥10 cm² (minimum 100 mm × 100 mm), including uncoated and coated woodfree papers, kraft linerboard, corrugated medium, and specialty packaging substrates. Its dual-chamber architecture supports both low-smoothness (e.g., newsprint, brown board) and ultra-high-smoothness (e.g., inkjet photo paper, metallized film laminates) materials within a single platform. The instrument meets metrological traceability requirements per ISO/IEC 17025:2017 for calibration verification and supports audit-ready documentation for GLP and GMP environments. All vacuum and timing functions are validated against national verification regulations (JJG 1092–2013) and referenced in Chinese national standard GB/T 456–2022 Annex B for instrument qualification.

Software & Data Management

Embedded firmware provides local data storage for up to 1,000 test records with timestamp, operator ID, sample ID, chamber used, vacuum range, and raw/time-corrected smoothness values. Data export is supported via built-in thermal printer (with optional header customization) and USB host port for CSV file transfer to LIMS or Excel. The system maintains full audit trail functionality—including parameter change logs, calibration event timestamps, and user login history—aligning with FDA 21 CFR Part 11 expectations for electronic records in regulated packaging QA/QC workflows. No external PC dependency is required for routine operation or report generation.

Applications

This tester serves as a primary metrology tool in pulp & paper mills for process control of calendering, coating, and supercalendering lines; in packaging converters for incoming material verification of folding cartons and corrugated blanks; and in third-party testing labs accredited to CNAS (China National Accreditation Service) or ILAC-MRA scopes. It is routinely deployed to assess printability readiness (ink transfer uniformity), barrier layer integrity (via surface pore distribution inference), and post-conversion effects such as embossing or laminating-induced roughness changes. Research applications include correlation studies between Bekk smoothness and optical gloss (ISO 2813), friction coefficient (ISO 8295), and digital inkjet dot gain (ISO/IEC 24790).

FAQ

What standards does the DR-ZB206A comply with?
It conforms to GB/T 456–2022, ISO 8791-2:2017, TAPPI T479 om-18, and ASTM D5263–21 for Bekk-type smoothness measurement.
Can the instrument measure both sides of a paper sheet automatically?
Yes—it executes sequential front/back measurements and computes the absolute two-side difference, displaying and printing the result with unit labeling.
Is external calibration required before use?
The instrument includes internal self-check routines and factory calibration certificates; however, annual verification using NIST-traceable pressure and time standards is recommended per ISO/IEC 17025.
Does the DR-ZB206A support network connectivity or remote diagnostics?
No Ethernet or Wi-Fi module is integrated; data exchange is limited to USB mass storage and thermal printout to ensure electromagnetic compatibility in industrial lab settings.
What maintenance is required for the vacuum pump?
The oil-free diaphragm pump requires only periodic inspection of inlet filter and replacement every 10,000 operating hours—no lubrication, venting, or seal servicing is needed.