WTD-01 Bending Stiffness Tester

The WTD-01 Bending Resistance Tester utilizes a two-point loading principle to assess the bending resistance of paper and board. It is designed to measure bending resistance within a range of 20 mN to 10,000 mN. While it is not suitable for corrugated board, it can be used for components derived from such materials.

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Overview

Key Definitions

Bending Force: The force necessary to bend a rectangular test specimen that is secured at one end.
Bending Resistance: The average of all valid measurements of the bending force recorded. It is expressed in either newtons or millinewtons.
Bending Length: The fixed radial distance from the clamp to the point on the test specimen where the force is applied.
Bending Angle: The angle formed as the clamp rotates from its starting position to where the bending resistance is measured.
Free Length: The entire length of the test specimen that extends beyond the clamp.

Importance

Bending stiffness in paper and board indicates how resistant the material is to bending or deforming. This property is essential for applications that require the material to retain its shape or resist deformation, such as in packaging, printing, and other paper products. Enhanced bending stiffness can lead to improved rigidity and stability.

Technical Features

Multi-Angle Measurement: Supports simultaneous setup for up to three test angles, commonly including 7.5°, 15°, and 30°.
Adjustable Bending Time: Provides options to select various bending durations depending on the elasticity of the material.
User-Friendly Interface: Features a 7-inch touchscreen for easy navigation and operation.
Print Output: Comes with a modular integrated thermal printer for quick and efficient printing of test results.

Testing Principle

The tester measures the force required to bend a test specimen, secured at one end, through a defined angle, typically 15°. The force is applied at a specified bending length (either 50 mm or 10 mm), and bending resistance is calculated as the average of the measured forces.

Application

Packaging: Bending stiffness is crucial for ensuring packaging materials retain their shape and adequately protect contents.
Printing: In high-speed printing operations, paper with suitable bending stiffness is vital to avoid problems like paper jams.
Paperboard Products: Items such as cartons and display boards require adequate bending stiffness to ensure structural integrity.

Configuration Options

Standard Configuration: Includes the WTD-01 Bending Stiffness Tester, a paper roll, a manual, a calibration certificate, and a power cord.
Optional Configuration: Available with a standard weight and load cell.