Product Introduction 
The Digital Bending stiffness tester employs the two-point bending principle. One end of the specimen is clamped while a bending force is applied to the other end. A high-precision sensor measures the moment required to bend the specimen to a set angle, quantitatively characterizing the bending stiffness of the material. The instrument is equipped with a microcomputer control system and an LCD curve display screen that plots the force-time-angle relationship in real time. Users can flexibly set the test angle (1-90°), test time, and bending length to perform standard stiffness tests, ring crush stiffness tests, and crease stiffness tests. Automatic zeroing, statistics, and printing functions enhance operational efficiency.

Key Features
Wide Angle Range Setting Bending angle freely settable from 1° to 90°, covering 7.5° and 15° standard stiffness tests and 90° crease stiffness test—one instrument for multiple applications.
Flexible Bending Length Selection Manual version offers eight fixed lengths: 5/10/15/20/25/30/40/50 mm; automatic version allows infinite adjustment from 5 to 60 mm to suit specimens of various thicknesses.
LCD Curve Display Pioneering LCD curve-display interface provides real-time force-time-angle curve visualization for intuitive monitoring of the test process.
Automatic Measurement and Statistics Features automatic zeroing, measurement, data statistics, and printing; test time freely adjustable from 3 to 35 seconds.
High-Speed Return Function Automatically returns to the initial position at high speed after testing; return speed adjustable from 0.55 to 20°/s for improved efficiency.
Dual Standard Compliance All performance parameters comply with GB/T 23144 and GB 22364-2018 standards, ensuring standardized and reliable test data.
Automatic Speed Calculation Automatically calculates the optimal test speed, simplifying operation and ensuring standardized test conditions.
User-Friendly Operation Intuitive microcomputer control interface; simple operation suitable for both laboratory and production floor environments.

Main Technical Specifications

FAQ 
1. What is bending stiffness? What are the 7.5°, 15°, and 90° test angles used for?
Bending stiffness is the ability of paper or paperboard to resist bending within the elastic deformation range. The 7.5° and 15° angles are standard test angles specified by national standards for general paper and paperboard stiffness measurement. The 90° angle is primarily used for crease stiffness testing, evaluating the spring-back properties of folded paper or paperboard.

2. What is the main difference between the manual and automatic bending length versions?
The manual version offers fixed bending length settings with eight common lengths from 5 to 50 mm, changed manually. The automatic version allows infinite length adjustment between 5 and 60 mm without manual changes, offering greater convenience when frequent bending length adjustments are needed.

3. How should the test time be set? What time is recommended for different materials?
Test time is freely adjustable from 3 to 35 seconds. The instrument's default time is recommended for standard tests. Thicker or stiffer boards may require slightly longer test times for stable data. Specific parameters can be determined by referencing applicable standards or through preliminary trials.

4. Does the instrument support data export and report printing?
The instrument features automatic statistics and printing functions, calculating and printing statistical data including average values and standard deviations. For electronic data export via USB or network interfaces, please consult our technical team for extended functionality options.

5. How is zero calibration and accuracy verification performed?
The instrument features automatic zeroing, which completes automatically upon startup. Routine accuracy verification can be performed using standard stiffness calibration strips. If deviations exceed tolerance, contact our after-sales service for professional calibration.

6. What are the installation environment requirements?
The instrument should be used in a clean environment at 20°C±10°C. The workbench must be flat and stable, free from strong magnetic fields and vibration sources. Power supply is AC 220V/50Hz, maximum current 5A, with reliable grounding.

After-Sales Service 
Established in 2007 and with nearly two decades of experience, Shandong Annimet Instrument Co., Ltd. is a professional manufacturer integrating R&D, production, and sales of laboratory testing and sample preparation equipment. Quality is our foundation. We are your bridge from concept to reality. We deliver more than just instruments — we deliver confidence. This Digital bending stiffness tester comes with a 12-month warranty and lifetime technical support. Our professional team offers 24/7 service response, free installation guidance, operation training, and testing method consultation. For any inquiries, please contact our customer service team; we are dedicated to providing comprehensive pre-sales, in-sales, and after-sales support. Hotline: 400-9933-057, Email: anmt_test@126.com.