Doctor blades for flexographic printing and rotogravure printing are critical tools for removing excess ink from the anilox roller, crucial for achieving uniform and streak-free prints. Available in plastic or metal materials like steel, they come in thicknesses ranging from 0.102 mm to 0.381 mm or more.
Regular replacement of steel doctor blades is essential as they wear over time, leading to issues affecting ink distribution.
Worn Edges: Usage can dull and wear the edges of steel doctor blades, causing streaks or uneven ink coverage, leading to poor print quality and the need for additional passes to achieve desired results.
Blade Pressure Variations: Worn blades can cause variations in blade pressure, leading to inconsistencies in ink distribution. This can result in streaking, smudging, or lack of uniformity in the print.
Inconsistent Ink Transfer: Over time, steel doctor blades may deform or bend, causing inconsistent ink transfer. This can lead to various issues such as incomplete coverage, clogging, or smudging.
Increased Friction: Worn blades can also generate increased friction, causing issues with print quality and uniformity. This may result in smudging, streaking, or other defects.
Correct positioning and support of steel doctor blades are crucial for optimal function and ensuring the blade efficiently removes excess ink from the anilox roller. Important factors in positioning and supporting steel doctor blades include:
Blade Angle: The angle at which the steel doctor blade is positioned is crucial for effective ink removal. The blade should be angled slightly towards the anilox roller, with the leading edge closer to the roller than the trailing edge. This allows the blade to make contact with the roller and efficiently remove excess ink while minimizing the risk of damage to the blade or roller.
Blade Tension: The tension on the steel doctor blade is also critical for effective ink removal. The blade should be tensioned enough to make contact with the roller but not so tight that it creates excessive friction or deforms.
Blade Cleanliness: Keeping the steel doctor blade clean is vital for optimal function. Dirt and dried ink can accumulate on the blade over time, disrupting ink transfer and reducing blade efficiency. Regular cleaning with a solvent or other cleaning agent can help minimize these issues and ensure the blade remains in good condition.
If you’re interested in learning more about our steel doctor blades, please feel free to contact us. Our team will be happy to answer any questions and provide further information about our solutions. Explore our selection of doctor blades below.
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