Testing of friction coefficient of packaging materials

With the rapid development of the flexible packaging industry, its quality problems have also become prominent. The use of units complaining that the packaging film has been broken, skidding, and the shutdown of packaging production lines are increasing, causing huge losses to many flexible packaging material plants and flexible packaging printing plants. The main reason is that it is not very good for the friction properties of flexible packaging materials. The above problems can be effectively solved by testing the friction coefficient of packaging materials.

Friction coefficient testing apparatus and method

*Test equipment: Jinan Languang MXD-01 friction coefficient meter; vmcpp. 25,lm, hot cover sample.

* Test method: Refer to GBl0006-881.

1. Take three 8cmX 20cm specimens. The specimen surface should be smooth, wrinkle-free, and may change the friction properties of the scar. The edges of the specimen should be rounded. The test surface should be free of dust, fingerprints, and any foreign material that may alter the surface properties.

2, the state of the sample conditioning and testing of the standard environment at a temperature of 23 ± 20C, relative humidity of 45% to 55% under the conditions of the sample is adjusted at least 16ho and then tested in the same environment.

3. After adjusting the level of equipment, the test surface of one sample shall be upwardly and flatly fixed on the horizontal test bench. The length direction of the sample and the test bench shall be parallel, and the test surface of the other test piece shall be downward, enclose the slide block, and fix the sample on both sides of the slide with tape.

4. The slider with the sample fixed is absent; the center strike is placed on the center of the first specimen, and the test direction of the two specimens is parallel to the sliding direction and the force measurement system is just free of force.

5, set the parameters, and then start the test. After the two specimens were in contact, the two specimens moved relative to each other for 15 seconds. The first peak force was the static friction force Fs. The average value of the force within 6 cm of the relative displacement of the two specimens (excluding the static friction force) was the dynamic friction force Fd. This process is automatic control, and the test process shows the curve in real time. At the end of the experiment, the friction coefficient was automatically calculated.

static friction coefficient μ s

0.515

0.560

0.556

μ d kinetic friction coefficient     

0.472

0.486

0.476

After the average of the three groups of experiments, μs = 0.543, μd = 0.478. From the experimental results, the three groups of experimental data are relatively stable, and the static friction coefficient is greater than the dynamic friction coefficient.

Because the device has the function of drawing the friction coefficient curve, the uniformity data of the material can be known according to the drawn curve. According to relevant information, the flexible packaging industry is generally less than 0.3, which is more suitable for production. Based on this, the data may be too large to control the friction coefficient by selecting the type and content of the opening agent and the smoothing agent in the resin so as to meet the user's requirements.

So in the end the friction coefficient is appropriate? The author believes that it is necessary to carry out continuous experiments according to the use of materials at the scene to finally determine the best coefficient of friction parameters.