The main test method for the impact resistance of plastic film is the free dart method, which is further divided into Method A and Method B, as follows:

Method A: The diameter of the dart head is (38 ± 1) mm, and the falling height is (0.66 ± 0.01) m. It is suitable for materials with impact damage mass of 0.05 kg~2 kg.

Method B: The diameter of the dart head is (50 ± 1) mm, and the falling height is (1.50 ± 0.01) m. It is suitable for materials with impact damage mass of 0.3 kg~2 kg.

The testing steps for the impact resistance of plastic film are as follows:

1. According to relevant materials or mutual agreement, choose to use either Method A or Method B.

2. Measure and record the average thickness of the impact area of the specimen, accurate to 0.001 mm.

3. The selected falling mass should be close to the expected impact damage mass. Add the required number of weight blocks onto the round handle of the dart and install locking rings to securely fix the weight blocks.

4. The selected counterweight △ m should be compatible with the impact strength of the specimen. Usually, the Δ m value is about 5% to 15% of the impact damage mass, and 3-6 (at least 3) counterweights must be selected.

5. Place the first sample on the lower fixture, ensuring that the sample is uniform, flat, and free of creases, and cover it with a rubber gasket. Clamping with the upper clamp of the annular fixture,

6. Turn on the electromagnetic iron and place the dart in its designated position. Turn off the electromagnet and the dart will fall. If the dart bounces off the surface of the sample, it should be captured in a timely manner to prevent repeated impact on the surface of the sample and damage to the hemispherical contact surface of the dart.

7. Check for any signs of sliding on the sample. If there is sliding, the test result should be discarded.

8. Check if the sample is damaged. Under the condition of illumination on the back of the sample, penetration of the sample is considered as damage. Record the results on a grid paper.

9. If the first sample is damaged, use a counterweight △ m to reduce the mass of the falling object. If the first sample is not damaged, a counterweight △ m must be used to increase the mass of the falling object. Continue with the samples in sequence, in short, use counterweights to reduce or increase the mass of the falling object, depending on whether the previous sample is damaged.

10. After testing 20 samples, calculate the total number of damages N. If N is equal to 10, the test is complete. If N is not equal to 10, the experiment should be conducted as follows.

10.1. If N<10, after supplementing the sample, continue the test until N equals 10,

10.2. If N>10, after supplementing the sample, continue the test until the total number of undamaged samples equals 10.

Performance characteristics of WLB-01 dart impact tester

1.Innovative mechanical design and easy operation;

2.Test MethodATheBDual mode design;

3.Microcomputer processing of experimental data;

4.Color touch screen display operation;

5.Intelligent experimental process, high work efficiency;

6.Pneumatic clamping and releasing of the sample reduces test errors and test time;

7.The experimental process does not require manual drawing and marking, and the data parameter system is displayed on the LCD screen;

8.The experimental data system automatically identifies and calculates data without the need for manual intervention;

9.The automatic end of the damage rate test is achieved, and the result is micro printed out;

Technical specifications of dart impact tester

Measuring range:ALaw:50～2000gTheBLaw:300～2000g

Measurement accuracy:0.1g(0.1J)

Measurement method:ALawBlaw

Sample size:>150mm*150mm

Sample clamping: Pneumatic

Overall dimensions:480*480*2100mm

power supply220V 50Hz

Weight: Approximately58kg

Standard configuration:Host, dart electromagnetic adsorption device, sample pneumatic clamping device, touch screen controllerAA complete set of weights for the dart headBFull set of dart head weights, foot switch, trachea, power cord

The above is the test method for the impact resistance of plastic film. For details, please call Shandong Weishen Electronic Technology Co., Ltd.