Klingspor main catalogue Abrasive, cutting-off & grinding discs Page 375
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Coated abrasives Technical Glossary Grit size chart The size coat supports the base coat in the anchoring of the grit on the backing and against forces which affect the grit during grinding. The cover bonds are produced exclusively from resin and also provide the product with its typical colour (exceptions are coated abrasives with additional coatings). 5. Special coatings Special coatings with grinding aids provide the grinding tool properties that positively affect the grinding process and extends the service life of the coated abrasive. Special coatings are applied as an additional layer. Stearate coating The stearate on a coated abrasive prevents the clogging and loading of the belt and is specifically suited for high quality varnish surface applications. Paints, varnishes and plastics can become soft and sticky through the heat generated from grinding, this can result in the premature clogging and loading of the belt. The dust clogs the space between the grits and this can result in additional “negative bond“. This clogs the grits and the sharp edges are no longer effective. To prevent this from happening or to slow the process down, the coated abrasives can be coated with a non-stick material, so-called stearates. P 12 12 16 16 12 20 20 P 16 P 24 24 24 P 20 P 30 30 30 P 36 36 36 P 40 40 50 P 50 50 60 P 60 60 80 P 80 80 100 P 100 100 P 120 120 120 P 150 150 150 P 180 180 180 P 220 220 Multibond The multibond, like the stearate coating, is applied in an additional production step to the cover bond layer. This allows the cool grinding of stainless steel and high alloy steels, which in turn increases the stock removal rate and service life. ACT – Advanced Coating Technology Klingspor uses this technology to improve the properties of the coated abrasives. When working on metal, ACT provides significantly higher grit adhesion, e.g. for aggressive belt grinding of the edges of punched parts and castings. This significantly increases the life of the grinding belt. For belts that are used for wood and varnish sanding, ACT prevents the premature clogging of the coated abrasives and significantly increases the service life. Antistatic Electrode migration is the result of friction i.e. grinding between different materials, and in turn causes charge separation, which in the case of non-conductive materials, such as wood, results in the load differences not being balanced. In these cases, the coated abrasive is equipped with antistatic properties that ground the electrical charge through the coated abrasive and the machine. This prevents the grinding dust from adhering to the workpiece, belt and machine. 375 Grinding knowledge 4. Size coat Rough grinding 220 P 240 P 280 240 240 P 320 P 360 280 280 P 400 320 320 P 500 P 600 360 360 P 800 P 1000 500 400 400 P 1200 600 500 800 1000 1500 1200 JIS 2000 ANSI 600 FEPA Extra coarse Coarse Intermediate grinding Finishing P 1500 P 2000 Micro finishing Fine 40 Extra fine
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