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Comma Scraper, Shanghai Donghui Roller specializes in making Comma Scraper which is high accuracy. And Shanghai Donghui Roller is the excellent expert all over the world.1.Generally, the opening is along the symmetrical axis of the roller. 2.Material is excellent 45# seamless steel pipe or alloy steel 3.Precise process includes heat treatment, mechanical treatment, chromate treatment, grinding and so on.4.The roller, straightness & out of roundness & proper alignment <= 0.003mm 5.The opening, straightness >= 0.005mm6.Hardness of surface HRC62 7.Finish of surface is Ra 0.01um (14 levels)8.Wearing resistance is excellet, friction effect is very clean. 9. used in coating machine, gumming machine, laminating machine, composite machine. Printing, packaging, leather, textile. Plastic, paper, and so on.Donghui Roller provides and repairs all kinds of rollers. For example, anilox roller, embossing roller, mirror roller, heating roller, cooling roller, woolen paper roller, rubber roller, ink proofer, knurling tool, chrome roller,teflon roller, ceramic roller,stainless steel roller etc. According to customer needs, we provide the feasibility analysis and system proposal. We can offer the roller which max diameter is 1 metre and max length is 10 metres. At the same time, we provides turning, grinding, dynamic and static balancing for the surrounding enterprise.Shanghai Donghui Roller specializes in making high accuracy Comma Scraper.