News & Knowhow

Due to a bad surface quality, dust formation occurs. With a high surface quality like through lap grinding reduces dust formation significantly Best surface qualities are with carbide metal knives

The back angle of the bottom knife has an impact on the cutting quality and the durability of the anvil. Problem 1: Back angle is too large Problem 2: Back angle is too low Solution to problem 1: low durability of the knives increased dust formation ...

Depending on the application the edge geometry of the upper knife has an influence on the durability, cutting quality, safety and the risk of breakings. Problem 1: Breaks on the knife edge, especially with carbide metal knives Problem 2: Bad cutting ...

A major factor on knife durability is the raw material used. The better the steel quality, the better the general durability of the knife. High-quality materials are more sensitive and have the tendency to chip- especially carbide metals, here it mus...

A flat cant angle close to zero results in a poor unclean, torn cut, increased dust formation and as worst-case ribbon breaks. Attention: Should the knife holder or the bearings have too much clearance due to wear and tear, it results that the pre-se...

A too sharp set cant angle reduces the lifetime of the knife, increases the risk of breakouts especially on carbide knives and increases the speed loss between upper and bottom knife. Reduce cant angle, max. 0,5°, on carbide knives ≤0,25° Assist: A b...

Reasons for chattermarks Chattermarks occur diagonally to the web running direction. Chattermarks are often a problem of worn bearings or gears, especially when the stripes are in line with the drive system. Other reasons may be the ink system, inclu...

Positive doctor blades usually move with the oscillation of the blade. Clearly visible and continuous in engraved and non-engraved areas. This problem usually comes from contamination of ink or equipment such as ink tanks, attachments and outdated fi...

A tiresome issue in flexo printing is the spraying of ink over the anilox roller onto the respective substrate. Colloquially this problem is also called "ink splashing". This printing error occurs particularly frequent when processing UV ink, which h...

The paint collects around the closing doctor blade and its surroundings. Due to its design, the doctor blade is subjected to dynamic pressure because the lamella surface lies within the chamber and bends inwards. If the doctor blade is too stiff, or ...