INK DOCTOR BLADE is a core consumable in flexographic printing and gravure printing. Its main function is to precisely scrape off excess ink from the surface of the anilox roller, leaving only a predetermined amount of ink to be transferred onto the printing plate. This directly determines the color reproduction and clarity of the printed product.

Key Technologies and Selection Points

Material Classification:

*Steel: Currently the mainstream in the industry, it is rigid and highly precise. Modern high-end steel blades, through optimizing carbide distribution, produce fine powder rather than debris after wear, effectively protecting the expensive anilox roller.

*Composite/plastic: It is softer and less harmful to the anilox roller, often used as the **containment blade ** in sealed chambers, but its ink layer control is inferior to steel blades in extremely high-precision printing.

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Core Process

Coating technology

High-end steel knives are coated with multiple layers of coatings (such as nickel-phosphorus/ceramic composite) to reduce the friction coefficient and prevent corrosion. This is particularly crucial for printing with white ink (high abrasiveness) or water-based ink (strong corrosivity).

Edge processing

A thin blade can achieve more precise control, but if the contact angle is incorrect (typically around 35 degrees), it may instead cause hydraulic lifting or incomplete scraping.

Common Faults

Anilox roller scratch

It is usually caused by selecting the wrong knife (such as a plastic knife embedded in a ceramic hole) or improper pressure and angle settings.

UV ink flying

This is caused by high ink viscosity. A special blade with a thicker base (such as MDC One-Step) can be used to reduce blade vibration and solve the problem