Talking about the cause of the formation of the ink stick

Talking about the cause of the formation of the ink stick

We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.

For more information please visit 

http://www.joyful-printing.com.   ENG only    

http://www.joyful-printing.net 

http://www.joyful-printing.org

email: info@joyful-printing.net

In printed matter, sometimes we find that one or more bars of darker color than normal colors appear in the flat net part. It is customarily called the ink bar, which not only affects the quality of the printed products, but also affects the beauty of the printed products. Appears and must be cleared immediately. So how is it formed?

First, Inadequate pressure between the ink rollers and between the ink roller and the roller causes the thickness of the ink layer on the printing plate to change to form a vacuum bar.

In the process of ink transfer, the ink passes through the ink fountain, the ink roller, the ink roller, the printing plate, and the blanket, and then can be transferred onto the printing material. In this process, if there is a problem in any part, it will affect the transmission of the ink, which will cause the thickness of the ink layer on the printing plate to change to form a ink stick. Commonly, there is a pressure between the plate roller and the squeezing roller, the pressure between the plate roller and the printing plate is too large, the pressure between the plate cylinder and the blanket cylinder is too large, and the blanket cylinder and the impression cylinder If the pressure between them is too large or the position is improper, etc., it will cause instantaneous deformation or frictional sliding between the two to form a deformation of the dot. Such ink sticks are generally not fixed in position, and there is no regularity, and it is usually necessary to adjust the pressure between them to solve.

Second, due to mechanical reasons, the relative slip between the rollers causes the ink bar

Longer mechanical wear time causes wear, resulting in a large gear meshing gap, and the gears cannot be smoothly driven, causing chattering during printing, which in turn causes an instantaneous frictional sliding to cause uneven ink transfer, and the dot is deformed to form a ink stick. Common mechanical failures of such ink sticks include severe wear of the drum gear, severe wear of the roller drive gear, and severe wear of the roller bearing. The position of the ink stick is generally fixed. Careful observation can reveal certain rules, and usually requires replacement of the parts. To solve.

Third, the ink stick formed by other reasons

There are many reasons for the formation of the ink bar during the printing process. In addition to the reasons mentioned above, it is usually seen that the ink is too thin, the viscosity is too small, and the ink is poorly transferred due to poor ink transferability; the paper prints poorly, the structure is loose, and the structure is easy to fall off. Ink bars caused by powder falling hair, etc.

When the ink stick appears, it is necessary to carefully analyze the cause according to the situation of the ink stick, and solve it in a targeted manner. Never blindly adjust it to avoid wasting time.