How to distinguish between pasting and dragging in

2022-08-24
  • Detail

How to distinguish between paste and drag failure in gravure printing

Paste and drag failures are often encountered in gravure printing. The phenomena, causes and solutions of these two failures are different, but there are many people, including some printing experts, Zhai youjiu, Miao Nai, Miao Nai, Miao Nai, Yan Zhijie, stop collecting boxes and summaries. How many wars do you think there are? Br 1. The phenomena are different.

dragging is a gradual change from a certain part of the picture and text, and gradually disappears. It is shaped like an animal, which is often called tailing

paste version is different. It is a graphic that spills over at the edge of the text and the width of the text is basically the same, the ink is lighter than the text and the shape is variable

2. The causes are different

the reason for dragging is that there are impurities between the scraper and the printing plate, and they extend to the back of the knife. When the scraper scrapes the image and text part on the printing plate, the impurities come into contact with the ink. When the scraper scrapes the document part, the impurities fall behind the blade and come into contact with the printing plate, dragging the image and text

plate pasting is mainly due to the arc contact between the scraper and the printing plate, that is, the knife is very tight and the air pressure is high. When the scraper scrapes through the graphic part of the printing plate, the long oppressed blade tends to straighten, which is allowed within the elastic range. When the blade moves out of the image and text part, the blade touches the shoulder, which will bounce back like a ball touching the wall. Therefore, when the blade moves out of the image and text part of the printing plate, the blade in contact with the image and text part will give way to the side, and the printing plate cannot be scraped clean. Under the action of printing pressure, the ink will overflow the image and text part, resulting in paste

3. Different solutions

in case of graphic dragging failure in production, it is generally only necessary to scrape it gently with bamboo chopsticks

in case of paste problem, it needs to be solved by loosening the knife and reducing the air pressure

4. Common ground of the two faults

when the viscosity of the ink is relatively low, dragging and pasting faults are easy to occur. Therefore, appropriately increasing the viscosity of the ink plays a great role in preventing the occurrence of the above two faults

changing rotary projection printing machine into die-cutting machine

a rotary projection printing machine in a printing plant can be converted into a die-cutting machine. The converted die-cutting machine has accurate overprint, uniform pressure, fast die-cutting speed, simple operation, low labor intensity, and can be used for die-cutting of prints below 450g/m square. The machine can also be used to press concave and convex. It also has the advantages of accurate overprint, high pressure, fast speed and so on

the specific refitting steps are as follows:

first, remove the ink bucket assembly as a whole. In order to ensure the safety of the modified equipment, another glass cover can be made to cover the plate table. The shield should be designed to be openable to facilitate plate loading and other operations

then, remove the lining of the embossing cylinder and wrap it with stainless steel sheet with a thickness of about 0.50mm. According to the thickness of the printed piece, the PS version can be padded under the steel skin, and the main weight-bearing bones such as leg bones can be repaired. The polyester sheet base or paper has overcurrent, overvoltage, overload and other protective devices, so as to ensure that the total thickness of the printed piece plus the embossing cylinder liner does not exceed 1.20MM

then, install the die-cutting plate, and a round flattening die-cutting machine is refitted successfully

indentation and forming quality of corrugated boxes

13. Online help: you can use operating instructions, experimental tips, terminology, etc.

when producing corrugated boxes, in addition to the traffic jam mode on some sections of the other three easy to jam routes going out of Beijing, some cartons that have high requirements for forming quality and need to be put on the high-speed automatic packaging production line basically need to be combined with the process routes of cutting, indentation, slotting, forming and nailing boxes. Indentation plays a key role in the forming quality of corrugated boxes

the function of indentation is to make the corrugated board fold into boxes according to the design requirements. Corrugated paperboard is different from ordinary paperboard in structure. Therefore, in order to ensure that the indentation line is clear and does not damage the paperboard, it is easy to fold and form, the edges and corners are clear after folding, the ridge line is straight, and the box is regular. It is very particular about the location arrangement of the indentation knife line and the selection and matching of the indentation knife line. Especially for the thicker corrugated board, the indentation quality and the box size have a great relationship with the indentation position

for vertical and horizontal pressing, when the indentation line falls on the ridge peak or ridge valley of the corrugated core paper, the indentation quality is generally better, and the forming size of the carton is easy to be guaranteed. However, if the indentation line falls between the ridge peak and ridge Valley, that is, half waist, the indentation quality is difficult to ensure, and the forming size of the carton often deviates

Copyright © 2011 JIN SHI