Advantages and characteristics of the most polar f

2022-08-16
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Advantages and characteristics of polar flame treatment technology

(1) chemical treatment method: it uses strong oxidizing chemicals to coat the surface of film substrate, so that polar groups such as hydroxyl and carbonyl groups are generated on the surface, and a certain degree of coarsening is obtained at the same time, so as to improve the surface bonding fastness of ink and plastic film. However, it requires a long treatment time, which affects the production efficiency, and the treatment solution is generally chemically corrosive, causing environmental pollution and harm to human body

(2) coating treatment method: coating a specific coating on the film to change its surface adsorption performance. However, the film coating requires lengthy pretreatment, coating and drying procedures, which is inefficient and changes the film structure

(3) UV treatment: it uses specially designed UV lamp to irradiate the surface of polymer, so that it can cause chemical changes, so as to improve surface tension and improve wettability and adhesion. Ultraviolet irradiation makes the surface of polymers undergo cracking, cross-linking and oxidation, which takes a long time to process, and the efficiency is too low

(4) plasma treatment: in a closed cavity, a high-frequency generator is used to ionize air or gas, and the free radicals, ions, ultraviolet rays, etc. with high energy and high reactivity of plasma are used to trigger the oxidation, degradation, polymerization and other reactions of plastic surface molecules, Thus, polar groups are introduced to enhance the adhesion of the film to the plastic surface. This method has the outstanding characteristics of short processing time and good effect, but the equipment investment is large, and it is difficult to clamp the sample. When the acceleration rate is ≥ 0.05% FS/s, attention should be paid to manipulation to meet the surface modification needs of bulk industrial products

(5) corona treatment: in fact, corona treatment is also a kind of low-temperature plasma treatment. Using a high-frequency (about 30kHz) and high-voltage (about 20kV) power supply, corona discharge is generated in the gap between the discharge tool holder and the blade to form a low-temperature plasma area. Its treatment function is: A. through discharge, the air between the two poles is ionized, and a low-temperature plasma area is formed on the surface of the film to modify the surface of the film. In addition, oxygen in the air ionizes in a high-frequency electric field, producing ozone. Ozone is a kind of strong oxidant, which can immediately oxidize the surface molecules of plastic film, convert it from non polarity to polarity, and improve the surface tension. After electron impact, micro concave and dense holes are generated on the surface of the film, roughening the plastic surface and increasing the surface activity. Because of its high production efficiency, it is the most popular surface treatment method at present

advantages and characteristics of polar flame treatment technology

polar flame treatment is an effective means to change the surface characteristics of many non absorbent substrates, which can make inks, paints, glues, coatings, etc. have better wetting and adhesion properties. Compared with corona treatment, the treatment quality is high, the treatment depth is shallow, the impurities on the substrate surface are purified, the treatment level is high, the surface tension is large, the attenuation is small, the environment is friendly, there is no ozone, odor generation, and water-based ink can be used. Compared with the most widely used corona treatment method in the plastic film industry at present, it has the following characteristics:

(1) the treatment level is high, the standard treatment value of polyolefin film is 50Mn/m-55mn/m, polyester film is more than 60Mn/m, and the maximum treatment level can be as high as 72Mn/M

(2) the stability of super long bonding force is the most, and it has only a small attenuation compared with the initial treatment level of plastic products in other categories, such as agriculture, construction, packaging and so on

(3) better treatment quality, shallow treatment depth (only 30 angstroms, corona treatment is 300 angstroms), and can purify the impurities on the surface of the substrate, and the film surface will not appear sticky substances like those after corona treatment

(4) needle residue l will not appear when treating thinner film

(5) reduce or do not use primer

(6) coextrusion film has better heat sealing performance

(7) improve the composite strength, more than 100g/m after corona treatment

(8) improve the barrier performance

(9) no ozone, no smell, no combustion residue, and will not cause environmental impact

(10) the optical and physical properties of the treated material will not change

(11) will not cause back treatment

(12) there will be no curling

(13) low start-up cost, low maintenance cost and safer

(14) both water-based and solvent based inks can be used (Note: the surface tension of solvent based inks is at least 38mn/m, and the surface tension of water-based inks is at least 42mn/M)

(15) the production speed can reach very high, 550m/min on the BOPP line, and 1000m/min on the line that can start from one production line alone

(16) can be used in BOPP, PE, pet, CPP film production lines

(17) the processing width of the new design theory can reach 11m

author/Shan Weizhong, LV Junfeng

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