The correct detection method for the coefficient of friction of soft packaging materials is briefly described.

The coefficient of friction of soft packaging material is an important attribute of packaging material, and it is the parameter index of the smooth performance of the material, and the value of this index is related to the smoothness of the surface of the material and the friction surface performance of its contact.
Packaging materials generally adjust their coefficient of friction by adding additives such as opening agents, smoothing agents, anti-static agents, etc., to reduce the mutual adhesion between materials due to molecular chain winding, static electricity and other factors, and improve the smoothness of the material, therefore, the amount and uniformity of additives added to the material can reduce the coefficient of friction is an important factor affecting the coefficient of friction of the material.
addition, the material itself' adability, printing, compounding, etc. may have an impact on the smoothness of the material.
In order to successfully complete the packaging process, it is required that the friction coefficient of the inner film of the soft plastic packaging material (direct contact with the product surface) and the outer film is different, such as the BOPP material used in the film packaging, the friction coefficient of the inner film is generally larger to ensure the accurate positioning of the film and the compactness of the cigarette pack;
the above factors affecting the friction coefficient of the material are helpful to realize the requirement of the difference of friction coefficient between the different surfaces of the packaging material.
, Guangzhou Standard Packaging Equipment Co., Ltd. on the plastic film friction coefficient detection method to make a brief introduction. the friction coefficient polymer of
plastic film has been widely used in the soft packaging industry, the friction coefficient of the material surface is one of the main factors affecting the speed of the packaging machine and the ease of opening of the packaging material, and the addition of additives (such as smoothing agents and anti-adhesive agents) in the production process is a common way to regulate the friction coefficient of the plastic surface.
addition, because electrostration adsorption forces not only affect the coefficient of friction between films, but also affect a variety of physical properties of the material, so anti-static agents are also commonly used additives.
However, different kinds of additives and film structure compatibility is not the same, migration to the surface of the material and the surface of the material to play a certain lubrication effect of the additive presence time and preservation environment dependence, and additives on the surface of the material uniformity is often not completely consistent, so the friction coefficient of the surface of the material will show inconsistent characteristics.
should pay attention to the test to be carried out at the same time when carrying out the comparative test of material friction coefficient, unless the effect of material aging is studied. the
material coefficient of friction detection method uses a test plate (placed on a horizontal operating table), secures a sample to the test plate by two sides of glue or other means, another sample is cut appropriately and fixed to a special slider, and then places the slider in the center of the first sample on the test board according to the specific operating instructions, and makes the test direction of the two samples parallel to the sliding direction and the force measurement system is not subject to force.
note that as the temperature increases, the coefficient of friction of some films will show an upward trend, on the one hand, this is determined by the characteristics of the polymer material itself, on the other hand, it is related to the lubricant used in the manufacture of the film (the lubricant is likely to have been close to its melting point and become bonded), after the temperature increases, the fluctuation of the measurement curve increases until the phenomenon of "slip".
in the automatic packaging process, the actual temperature of the equipment because the component running heat dissipation will be higher than room temperature, so it is necessary to detect the friction coefficient of the film at the actual packaging ambient temperature.
if the coefficient of friction to metal outside the film needs to be detected at high temperature conditions, it is not desirable to judge the friction performance in high temperature environment only by using the coefficient of friction data at room temperature.
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