There are two common surface treatment processes for BOPP films: one is corona treatment and the other is flame treatment. Because corona treatment is simple and easy, the solution is very good, so most film manufacturers choose this method. Below, I will give you an explanation of the elements that jeopardize the compressive strength of BOPP film corona treatment are.

First, the output power size

Film production and manufacturing commonly used output power size is the most immediate element that jeopardizes the surface support. General conditions, increase the output power, surface support increased. But the output power added to a certain level, the surface support force is likely to be no longer a significant shift. At this time, it is necessary to adjust the surface support force according to other ways.

Second, the type of electrode

Corona treatment selection of single electrode or double electrode method in solving the actual effect of the above there is a certain difference. Double electrodes and single electrode comparison has a variety of advantages: the same energy consumption will show some higher solution value; can reduce the attenuation coefficient of the surface support force in storage; can reduce the film in the corona treatment process in the whole process of heat exposure, can reduce the film surface magnetic induction of electrostatic induction.

Film temperature

When the temperature of the film rises and other criteria do not change, the surface resolution value of the film increases correspondingly. Therefore, according to adjust the setting temperature of the heating roller, or adjust the temperature of the cross pull out of the film to improve the surface solution value of the film, is one of the effective methods often chosen in the processing technology manipulation. Film temperature is generally adjusted in the middle of 40 ℃ -60 ℃.

Fourth, the production line rate

Not the same production line rate, the film is not the same time period of retention between the pole plate. Thus, the corona treatment of the electrode working voltage should be accompanied by the shift in production line efficiency to make corresponding adjustments, along with the increase in production line efficiency and expansion.

Fifth, the electrode exhaust volume

Corona treatment is a low-temperature plasma solution. In the whole process of corona treatment, plasma will penetrate the film, destroying its ionic bonding, stirring up random dispersion base, and oxygen ions play a role in generating air oxidation electrode polarization base, this functional group will be detrimental to the surface wetting characteristics of the film. Plasma concentration value on the surface of the film will simultaneously jeopardize the actual effect of corona treatment. In addition, during the arc discharge, there will continue to be a lot of reactive oxygen, which is an oxidizing agent that will increase the surface support of the film. In general, the larger the electrode exhaust system gate valve is opened, the smaller the surface resolution value of the film; conversely, the smaller the air exhaust volume is, the larger the surface resolution dyne value of the film will be. Adjusting the size of the air exhaust volume is also one of the methods often used to manipulate the surface support force. However, if the exhaust volume is too small and the concentration of carbon dioxide is very large, it is not only difficult for the environment, but also leads to a certain degree of corrosion on the surrounding machinery and equipment.

Six, surface raw materials

Polypropylene can be divided into homopolymers and polymers, for both, because of the difference between the raw materials themselves, after undergoing the same corona treatment, the two surface support has a big difference. Generally speaking, the positive ions penetrate into the surface of the polymer is more efficient than the homopolymer, so it is very easy to solve the heat penetration layer of the heat-sealed film to achieve a better solution to the compressive strength.

In addition, the usual application of silica-copper slip agents can significantly reduce the surface support value of the film. Even the application of silica-copper slip agents on the non-resolving surface can greatly jeopardize the resolving compressive strength. Antistatic agent transferred to the surface of the B0PP film corona treatment of the actual effect also has a certain degree of harm.

Seven, electrode pole plate and pole plate gap

Electrode pole plate and corona discharge roller in the middle of the spacing is generally in the middle of 2 ~ 2.5mm. In the long-term use, the pole plate gap is likely to produce deformation, thereby jeopardizing the film support force of the proportionality, it must be carried out carefully corrected, so that it is basically proportional and consistent (pole plate gap in the middle of the adjustment should be slightly larger than the two sides, in order to compensate for the production process of the pole plate heat deformation of the hazards generated by the production process). Plate gap on the actual effect of corona treatment has a certain degree of harm: in general, in the case can be, as far as possible to reduce the corona discharge rollers and electrode plate spacing in the middle of the electrode, that can significantly enhance the level of resolution. Electrode pole plate in long-term use, the surface of the electrode will cause a layer of metal oxides, thus jeopardizing the solution of the actual effect, then you can use the copper brush, sandpaper and so on to do away with it.

Eight, other

Just produced and manufactured down the BOPP film must be stored for a few days to carry out tempering treatment. During this period of time, the film is sufficient to close at will, releasing thermal stress, specification reliability is improved. Additives in the film (such as antistatic agents, slip agents) in the premise of tempering treatment, will be gradually transferred from the fiber tube to the surface layer. The polymers are transformed from indefinite to crystalline form during the aging process, which in turn jeopardizes the actual effect of corona treatment. Since the arc discharge is carried out in the air, the relative humidity of the air will also affect the level of resolution. Air relative humidity (such as the southern region of the rainy weather), the actual effect of the solution is usually less idealized.

With more than 20 years of experience in surface treatment, Hopfen Jiaoda is a global leader in providing professional solutions for customers. Our rich experience in industry applications and production line support enables us to provide the most efficient and precise solutions to our customers, and we are proud to say that we have sold more than 20,000 corona treatment machines worldwide.

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