Comprehensive comparison of rotary screen printing and flat screen printing technology
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Rotary screen printing technology has many advantages compared with flat screen printing equipment, especially it can form a high-speed production line with flexo printing equipment, embossing equipment and offset printing equipment, which greatly improves production efficiency. In the following, several new rotary screen printing equipments of Gallus will be taken as an example to systematically analyze the characteristics of rotary screen printing.
Flat screen defect
The flat screen is usually made of polyester mesh stretched on the frame. In order to obtain good sharpness and image detail of the printed matter, a certain gap should be left between the screen and the substrate during printing. In the middle, the screen is under pressure and in contact with the substrate, the squeegee moves, and the ink under the screen moves to the surface of the substrate; at this time, a certain ink remains in the fine hole of the screen, and the excess ink is easily adhered. Make the image dirty or fuzzy on the printed matter.
Another problem with flat screen printing is that the rubber squeegee presses and moves the screen, which causes the ink to transfer, and also makes the screen and image stretch. The closer the squeegee is to the edge, the greater the elongation, and naturally Causes some distortion and distortion of the image, causing printing distortion.
However, the rotary screen printing has a drum-like screen, and the screen and the substrate are in line contact, which can avoid image distortion during printing.
Online printing
Is flat screen printing nothing? it's not true. In many fields, such as lottery, card and other printing fields, it is very convenient and practical, which is impossible for a rotary screen printing machine. However, most areas are still suitable for rotary screen printing.
The rotary screen printing machine has a certain standard in design and has the ability to connect to the web printing equipment (such as rotary letterpress, flexo or offset press) on the production line. This roll-to-roll online printing method is commonly used for packaging and trademark printing, personal health card printing, and beverage label printing, as well as for transparent plastic film printing or advertising printing.
On-line printing allows users to take advantage of the ink deposition characteristics and high-resolution resolution characteristics of different plates. If the customer wants to get 30μm thick UV ink, then the rotary screen printing machine can meet this requirement, because the rotary screen printing can provide 20~30μm ink layer thickness; if the customer requires very fine image printing or high resolution outlets Printing, then flexo or offset printing is the best choice, and these can be used online to take advantage of the advantages of various printing technologies to achieve the widest production capacity.
In terms of the heavy characteristics of printing inks, the use of on-line technology can produce opaque prints and brightly colored prints. The specific combination of processes is to print high-definition images with flexo or offset printing to rotate the screen printing background or bright field.
For coarse mesh and special ink printing, including gold and silver ink, thermochromic ink, electronic fluorescent ink, etc., it is best to choose rotary screen printing. This type of printing also produces tactile images such as Braille. Screen protectants and coatings are chemically resistant and resistant to oxidation and are suitable for many specialty inks.
Rotary screen printing equipment
On-line equipment includes letterpress, flexo and offset presses, and one or more rotary screen printing units, stamping units and die-cutting units can be configured in the online unit. Typical models are:
R200 screen printing machine, printing format 8 inches (203mm), can be connected with letterpress printing equipment, UV glazing equipment, web printing equipment and curing equipment.