Definition
The Cardboard Bursting Strength Meter is an instrument used to determine the maximum pressure of cardboard subjected to a uniform increase in pressure perpendicular to the surface per unit area until it breaks. The rupture strength measured by this equipment is one of the key indicators for evaluating the mechanical properties of cardboard, and is widely used in packaging material quality evaluation and production process control.
Principle
The instrument works on the principle of hydraulic incrementation. During the test, the specimen is clamped between the fixed clamping ring and the movable clamping ring, and the rubber diaphragm is expanded at a uniform speed through the hydraulic system, so as to apply a uniform increasing pressure perpendicular to the surface of the cardboard to the specimen. When the specimen is broken, the system automatically records the maximum pressure value, which is the bursting strength, usually expressed in kilopascals.
Measurement method
The measurement process must follow the relevant standard methods. First, place the pretreated specimen flat between the clamping rings to ensure that the clamping force is uniform to avoid slippage. After starting the equipment, the hydraulic system drives the diaphragm to expand and apply pressure at a standard rate. The instrument automatically detects and records the maximum pressure value at the moment of rupture. Usually, each group of specimens needs to be tested in parallel multiple times, and the arithmetic average is taken as the final result. Test conditions such as temperature and humidity need to be controlled according to standard requirements to ensure data comparability.
Influencing factors
The bursting strength of cardboard is affected by various factors. The characteristics of the material itself, such as fiber type, length and bond strength, are the basic factors. The quantification, thickness and lamination structure of cardboard directly affect its resistance to rupture. Environmental conditions, particularly relative humidity, can alter fiber flexibility and affect strength performance. In addition, the uniformity of specimen clamping, test rate and other operating parameters need to be strictly regulated to reduce measurement deviations.
Application:
The instrument is mainly used in the paper product production and use industry. In the paper industry, it is used for in-line quality monitoring and process optimization. In the packaging industry, it is used to evaluate the resistance of packaging materials such as corrugated cardboard and boxboard in the actual circulation process to provide a basis for packaging design. In the third-party testing institution, it provides fair product performance evaluation services according to the standard.
Selection
When selecting an instrument, it is necessary to consider the measurement range, accuracy and compliance with standards. The measurement range should cover the expected strength value of the material to be measured. Accuracy levels need to meet quality control or research requirements. Instruments should comply with standard methods adopted by the target market or industry, such as ISO 2758, GB/T 1539, etc., to ensure that the test results are widely recognized. In addition, the ease of operation, data output function and maintenance cost of the equipment are also aspects that need to be evaluated in the actual selection.