The importance of tear strength test of packaging materials

The friction in the actual packaging process is often both drag force and resistance, so the friction coefficient must be effectively controlled so that it is in the proper range. Rolls for automatic packaging generally require a relatively low coefficient of friction in the inner layer and a moderate coefficient of friction in the outer layer. However, the inner layer friction coefficient should not be too small, otherwise it may cause the stacking material to be unstable during the bag forming process and produce the wrong side; the too large outer layer friction coefficient will cause the resistance during the packaging process to cause the material to be stretched and deformed too much. Caused by the sliding mechanism to cause electric eye tracking and cut off positioning is not allowed. When studying the friction coefficient of materials, special attention should be paid to the effect of temperature on the friction coefficient. The coefficient of friction of the material may increase or decrease significantly as the temperature changes, and it may also maintain a certain degree of data stability. Considering that the actual operating temperature of the production line cannot always be well controlled in the room temperature range, it is not only necessary to measure the friction coefficient of the packaging material at room temperature, but also to investigate the friction coefficient at the actual use ambient temperature. To complete this kind of temperature change test, you can change the ambient temperature of the laboratory (when the required temperature is close to the room temperature, it is still desirable), and you can also use the automatic temperature control function of the testing equipment.
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