Definition
The carton rupture strength tester is a special equipment used to determine the physical properties of cardboard, corrugated cardboard and its products against external pressure until they rupture. The instrument quantifies the bursting strength of packaging materials by simulating the static pressure they are subjected to during transportation and stacking, providing key data for the quality assessment and design of packaging materials.
Principle
The instrument works on the principle of hydraulic incrementation. The specimen is clamped above the retractable rubber membrane, and the liquid pressure under the rubber membrane is increased at a uniform speed through the hydraulic system, so that the rubber membrane expands evenly and continuously exerts vertical force on the specimen. When a specimen ruptures, the system records the instantaneous maximum pressure value, which is the breaking strength of the specimen, usually expressed in kilopascals or pounds per square inch.
Measurement method
Measurements follow a standardized operating procedure. First, the specimen is placed flat between the clamping rings of the instrument to ensure that there are no wrinkles and that the clamping force is uniform. After starting, the hydraulic system pressurizes at a constant rate until the specimen ruptures, and the instrument automatically records the peak pressure. The same batch of samples is often tested multiple times, with arithmetic averages as the final result to ensure that the data is representative. The testing process should be conducted in a standard temperature and humidity environment to eliminate environmental disturbances.
Influencing factors
Test results are influenced by a variety of factors. The characteristics of the material itself, such as fiber type, slurry ratio, and processing technology, determine its basic strength. Environmental conditions, especially relative humidity and temperature, can affect the moisture content and flexibility of the paper. The way the specimen is handled, including the amount of clamping force, the presence of pre-damage, and conditioning before testing, also has a direct impact on the data. In addition, whether the calibration status and pressurization rate of the instrument meet the standard requirements are the technical prerequisites to ensure the accuracy of measurement.
Application:
The instrument is widely used in packaging manufacturing, printing, quality inspection institutions, logistics and transportation industries. In the packaging and manufacturing process, it is used for raw material inspection and finished product quality control. In the logistics packaging design phase, data support is provided to optimize the box structure and materials. Third-party testing agencies conduct tests according to relevant standards to provide a fair quality evaluation basis for trade activities. In addition, it is also used in research institutions to evaluate and develop new packaging materials.
Selection
There are many aspects to consider when choosing equipment. The measurement range should cover the expected strength of the material to be measured with a certain margin. Accuracy and resolution should meet the specific requirements of the standard on which it is based. The equipment should have good data storage and output functions for easy recording and analysis. The user-friendly design of the user interface helps improve testing efficiency. The durability and long-term stability of the instrument, as well as the calibration services and technical support provided by the supplier, are also important considerations. The final choice should be based on the actual testing needs, the standards to be followed, and a reasonable budget.