At present, the Scraper Blade production materials are mainly rubber, aluminum plate, thin steel plate, etc., the characteristics of different materials are quite different, the scope of application is also different. Such as rubber materials (including natural rubber, chloroprene rubber, polyurethane rubber and synthetic rubber, etc.), natural rubber and chloroprene rubber wear resistance is not good, darker, but the price is low, used for manual printing or And the color of the color of the different color (the color of the lighter the better the better) the best quality of light yellow, wear resistance, solvent resistance is also more short-tailed bird's clothing, , But very sensitive to polar solvents. Aluminum alloy plate is mainly used for making ink knife, with a light, easy loading and unloading and so on. The thin steel plate material is mainly blue and thin steel plate and two kinds of thin, generally used for fabric screen printing machine.
Scraper Blade quality performance indicators are mainly hardness, wear resistance and chemical resistance in three areas
1. hardness Hardness that Scraper Blade hardness and flexibility, refers to the degree of compression deformation of the Scraper Blade, generally expressed with Shore hardness, the higher the value, the greater the hardness, otherwise the smaller. For screen printing, the ink transfer and graphics reproducibility are related to the hardness of the Scraper Blade, the hardness is small in favor of Scraper Blade and screen contact, is conducive to filling ink, but its poor bending resistance, easy to Scraper Blade and screen Version of the contact angle changes, the printing quality of the stability of a greater impact. Hardness of the Scraper Blade good bending resistance, but the contact between the Scraper Blade and the screen worse, not conducive to filling ink, and printing, the hardness of the Scraper Blade on the screen of the friction, so that the larger wear and tear, sometimes But also affect the printing accuracy. According to the soft and hard contact with the better features, in the printing, if the substrate is soft materials (such as paper, plastic film, etc.) or relatively smooth, you can choose a hard Scraper Blade, and if the substrate if the hard material (such as glass , Metal, etc.> or relatively rough, you can choose a smaller hardness of the Scraper Blade. As the Scraper Blade in the scratch will be subject to a certain pressure, bending, so the use of Scraper Blade, to consider the Scraper Blade bending fatigue and mechanical strength, It has a certain degree of flexibility. Scraper Blade in the scratch at the same time will be due to friction and heat, so that after the temperature rise after the hardness changes, therefore, to choose a good heat-resistant material made of Scraper Blade. Scraper Blade hardness can be divided For the soft, medium, hard three kinds of blade, 45 ~ 50 Shaw degrees is a special soft blade, 75 ~ 80 Shaw degree is a special hard blade. General choice of 60 ~ 90 Shore hardness as well. And the higher quality of color screen printing, Scraper Blade hardness generally selected 70 degrees.
2. Wear resistance. Abrasion resistance is a measure of the service life of the Scraper Blade and extends the characteristics of the Scraper Blade's use of time. As the Scraper Blade and screen printing plate is in direct contact with each scraping when there is friction, so the Scraper Blade is required to have a good wear resistance and a certain degree of mechanical strength, in addition, the Scraper Blade to have a certain degree of lubrication, so scraping as much as possible Reduce friction, to ensure the life of the Scraper Blade.
Chemical resistance. Chemical resistance is to ensure that the Scraper Blade and ink, solvents and other contact does not occur when the chemical changes, and affect the quality of printed materials. As the Scraper Blade in use need to contact all kinds of ink and ethanol, gasoline and other solvents, various types of rubber material on the solvent affinity is different, so the blade in contact with ink or solvent its performance will change, the most common is the Scraper Blade hardness and Volume changes, that is, after exposure to solvent volume expansion deformation. When the Scraper Blade is inflated, it will reduce the edge of the edge of the Scraper Blade, resulting in uneven printing ink and affect the printing quality. In general, high hardness rubber cross-linking density, ink and solvent molecules difficult to immerse rubber molecules, so the expansion coefficient is relatively small. So the choice of Scraper Blade, you can consider to meet the requirements of printing under the premise, try to choose a higher hardness of the rubber Scraper Blade, so that deformation to a minimum. In addition, the Scraper Blade performance indicators are moisture resistance, corrosion resistance and heat resistance. In summary, it is desirable that the Scraper Blade must be resistant to animals, minerals, vegetable oils and oils, and can withstand the effects of oxidation of the metal components contained in the ink.
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