The Detection Principle of Microcomputer Stiffness Testers

The ZY-TDY300 microcomputer bending stiffness tester is a specialized instrument designed to quantify the bending stiffness of low gram weight paper, cardboard, films, plastics, and other flexible sheet materials. By precisely measuring the force required to bend a sample to a specific angle, it provides an objective evaluation of material stiffness and resilience. This article explores the fundamental detection principles behind this crucial testing device.
 

1. Controlled Bending Force Application:

The core principle of the bending stiffness tester involves applying a controlled bending force to a rectangular sample of the material. The instrument features a clamping mechanism to secure one end of the sample horizontally, while a bending arm or probe applies a force at a defined distance from the clamp. The measuring range of 0-1000g (0-10000mN) indicates the instrument's capacity to accurately detect and measure this applied bending force across a wide range of flexible materials.

2. Precise Angle Measurement:

A key parameter in bending stiffness testing is the bending angle. The ZY-TDY300 allows for a highly adjustable bending angle, ranging from 1 to 95 degrees with no fixed increments. This adjustability enables testing under various degrees of flexure, mimicking real-world bending scenarios. An angle accuracy of ±0.1° ensures that the bending angle is precisely controlled and measured, contributing to the overall accuracy of the stiffness determination.
 

3. Variable Test Spacing (Span):

The distance between the clamping point and the point where the bending force is applied, known as the test spacing or span, significantly influences the bending stiffness measurement. The ZY-TDY300 offers multiple selectable test spacings (1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm), with a high span accuracy of ±0.1mm. This versatility allows for testing materials with different flexural characteristics and for adhering to various testing standards that might specify particular span lengths.
 

4. High-Accuracy Force Sensor:

The instrument utilizes a highly sensitive force sensor with a sensing accuracy of 0.1% and a resolution of 0.01mN. This sensor precisely measures the resistance offered by the material to the applied bending force. The measured force is directly related to the material's stiffness – a stiffer material will require a greater force to achieve the same bending angle.
 

5. Angular Speed Control:

The angular speed at which the bending arm moves is another controlled parameter. The ZY-TDY300 allows for adjustable angular speeds ranging from 0.5 to 5°/sec. Controlling the bending speed ensures consistent loading rates and minimizes the influence of viscoelastic properties of the material on the stiffness measurement, leading to more reproducible results.
 

6. Multifunctional Measurement (Stiffness/Folding Wolf Stiffness):

The instrument offers multifunctional measurement, including both standard bending stiffness and "folding Wolf stiffness." While the exact principle of "folding Wolf stiffness" might require further context or a specific standard reference, it likely involves a variation of the bending test designed to evaluate stiffness under more complex or localized bending conditions, potentially simulating folding behavior.
 

In essence, the ZY-TDY300 microcomputer bending stiffness tester operates by precisely applying a controlled bending force at a defined distance along a sample, accurately measuring the resulting bending angle and the resistance force offered by the material. The adjustability of parameters like bending angle, test spacing, and bending speed, coupled with a high-accuracy force sensor, enables a comprehensive and objective assessment of the bending stiffness and resilience of various flexible materials.