Questions about knife line in gravure printing

Q: Some customers report that each time the medium-speed printing machine will use the knife line, but we bring the version back to see the plate surface is bright and normal, there is no problem with the proofing, ask the proofing layout is normal whether it can be judged whether the layout will bring the knife line Standard basis?

Is it due to a printer blade? Have you ever encountered a similar situation?

A: 1, more factors, depending on the specific situation.

Plate roller: Insufficient polishing or throwing direction, improper method; hardness is not right... Hardness standard is yes, polishing does not know if there is

Ink: Ink particles, old ink and new ink all affect the ink fineness standard

Scraper: There is an angle problem, the effect of import and domestic is really not the same ... Squeegee angle should have an approximate range

2. It may be caused by the chrome surface of the platen roller not being polished properly. It is thrown with 600 sandpaper or thrown by a machine several times.

3, this is the most common phenomenon in the printing factory, usually from the following aspects to solve:

a. Check whether there is any problem with the hardness of the roller. If the hardness is above 800HV, there is basically no scratch on the chromium layer.

b. Polishing intensity and lines are not good, resulting in chromium layer with ink;

c. The accuracy of the plate roller is not enough, there is a jump to cause the blade to jump;

d. The surface grinding is not fine enough, or the copper surface is not polished well, resulting in poor flatness of the layout, thus resulting in ink.

If the plate-making factory can find the problem from the above four points, it can solve the best. If it can not solve the above problems, we must communicate with the printing factory. Generally, a good printing factory has its own set of methods. This is common for Bijing. Faults are also better resolved