Plastic film Impact performance test how much do you know
In the packaging and materials industry, the impact resistance of plastic films is a crucial material property. Understanding how a material behaves under impact can help ensure its reliability and safety in real-world applications. This article will introduce two commonly used methods for testing the impact resistance of plastic films: the free falling dart method and the pendulum impact resistance method. These methods can be used to evaluate the impact resistance of materials under different conditions.
free fall dart method
The free falling dart method is a method for testing the impact resistance of materials. It measures the damage energy of plastic film or sheet samples through the impact of free falling darts. This method is usually suitable for thin specimens with a thickness less than 1mm.
ãTest principle ã
The principle of the test is that when the free falling dart falls freely from a certain height, it has a certain kinetic energy. When it impacts the sample, part of the kinetic energy will be transferred to the sample. The impact resistance of the specimen depends on the amount of kinetic energy it can withstand. If the sample is damaged, the kinetic energy will be partially absorbed, so that the greater the mass of the sample being impacted, the greater the kinetic energy and the higher the impact resistance.
ãTest equipment ã
The testing equipment required for the free falling dart method includes impact testing machines, specimen fixtures, electromagnets, positioning devices, buffering and protective devices, locking rings, etc. The falling dart used in the test is usually made of aluminum, phenolic plastic, or other low-density material of similar hardness, and has a hemispherical head and a round shank for mounting and unloading the weight.
ãTest Methods ã
The specific test steps include clamping the sample between ring clamps, adding appropriate weights, raising the free falling dart to the specified height, and then releasing the free falling dart to allow it to fall freely and impact the sample. If the specimen is not damaged, the test can be retested. After the test, the impact strength is calculated based on the damage rate of the sample.
Anti-pendulum impact method
The pendulum impact method is another commonly used method to test the impact resistance of plastic films. It evaluates the impact resistance of plastic films by impacting the specimen with an oscillating hammer head. This method is suitable for materials with an impact damage mass greater than 50g.
ãTest principle ã
In the anti-pendulum impact method, the specimen is fixed in a specific position, and the swinging hammer head is released to hit the specimen. The impact resistance of a specimen depends on the impact force it can withstand.
ãTest equipment ã
The testing equipment required for the pendulum impact resistance method includes a pendulum impact testing machine, specimen fixture, pendulum system and impact hammer head. The design of the testing machine allows the hammer head to swing at a certain speed and impact the specimen.
ãTest Methods ã
The test method involves clamping the specimen in a fixture and then releasing the oscillating hammer head, allowing it to swing and impact the specimen. If the specimen is not damaged, the test can be retested. After the test, the impact strength is calculated based on the damage rate of the sample.
Conclusion
Impact resistance testing of plastic films is a key step to ensure the quality and reliability of packaging materials and products in practical applications. The free falling dart method and the pendulum impact resistance method are two commonly used test methods. They can help manufacturers and engineers evaluate the impact resistance of materials under different conditions, thereby selecting appropriate materials and improving product design to ensure that the product will It will not be damaged during transportation, storage and use, improving product quality and protecting consumers' interests.
