In the coating process, the glue is often uneven, which requires a certain glue scraping mechanism to evenly scrape the glue. The glue scraping mechanism mainly includes stainless steel blade, comma scraper, scraper rod, wire scraper, air flow scraper, etc.
Stainless steel blade
This kind of scraper is cut with stainless steel sheet, pressed on the scraper seat and acted on the upper (coating) rubber roller. Due to the softness of the stainless steel sheet, the squeegee is not very uniform. Most of the squeegee is used for the squeegee on the anilox roller, and it is also used for the pre-scraping of the glue coating on the smooth roller.
Comma scraper
This kind of scraper is usually made of round steel with good strength and hardness. When scraping glue, the scraper is fixed and does not rotate. This kind of blade has high strength, high hardness and small edge straightness error. Pneumatic and fine adjustment mechanism can be used to adjust and control the position of the blade. The coating amount control and the glue precision are high, and it is also very convenient to use. Because its squeegee is very uniform, it is suitable for precise squeegee coating on the smooth roller.
Scraper
This kind of scraper is usually finished by round bar with better strength and hardness. The round bar is required to rotate when scraping glue. Sometimes the scraper can also be scraped directly on the substrate. The full run-out error of the scraper bar is very small, and it is mostly used for the pre-scratch glue applied by the glue-bar scraping device on the smooth roller. When the viscosity of the glue is large, it can also be directly scraped on the substrate with a scraper, as the precise scraping of the coating mechanism. It can also be used for disposable squeegee with thick coating.
Wire scraper
This type of scraper is made of high-precision cold-drawn round steel densely wound with stainless steel wire. It is better if the wire scraper is driven by a micro DC motor while scraping the glue. When scraping glue, the wire scraper usually acts directly on the substrate. But generally speaking, it is only used for the pre-squeegee glue applied on the smooth roller. A precise squeegee with a comma scraper is usually needed later.
Air scraper
The air flow scraper mechanism acts on the glue roller by the uniformly ejected air (pressure) flow, which serves the purpose of scraping glue. The gas (pressure) flow is required to be evenly distributed over the entire width of the smooth roller. This kind of scraper is mostly used to scrape the glue with better fluidity. The precision of this kind of scraper is also high, and it is widely used in the coating and scraping of whiteboard paper.
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