Screen Printing Difference Analysis

Screen printing consists of five major elements: screen printing plates, squeegee blades, inks, printing stations, and substrates. The basic principle of screen printing is: using the screen printing plate graphics part of the network through the ink, non-graphical part of the mesh does not penetrate the basic principles of printing ink. During printing, ink is poured onto one end of the screen printing plate, and a certain pressure is applied to the ink portion of the screen printing plate by the squeegee blade while moving toward the other end of the screen plate. The ink is pushed by the squeegee from the aperture of the graphic portion onto the substrate during the movement. Due to the stickiness of the ink, the imprinting is fixed within a certain range. During the printing process, the squeegee is always in line contact with the screen plate and the substrate, and the contact line moves with the squeegee, due to the screen plate and the substrate. Keeping a certain gap between them makes the screen printing plate at the time of printing produce a reaction force against the squeegee by its own tension, and this reaction force is called resilience. Due to the effect of the resilience, the screen plate and the substrate are brought into contact with only the movable line, and the other portions of the screen plate are separated from the substrate. Causes the ink and the screen to undergo a cracking motion, which ensures the dimensional accuracy of printing and avoids soiling substrates. When the squeegee is scraped across the entire plate, it is raised and the screen plate is lifted, and the ink is scraped back to its original position. This is a printing trip.

1 strong print adaptability

The three printing methods of plain printing, embossing, and gravure printing can generally only be printed on flat substrates. Screen printing can not only be printed on a flat surface, but also printed on curved, spherical and irregular substrates. On the other hand, screen printing not only can be printed on hard objects, but can also be printed on soft objects without being limited by the texture of the substrate. In addition, in addition to direct printing, silk screen printing can also be printed by indirect printing methods as required, that is, screen printing on gelatin or silica gel plates and transfer onto substrates. Therefore, it can be said that screen printing has a strong adaptability and a wide range of applications.

2 thick ink layer, strong three-dimensional

The texture is rich in offset and embossed ink layer thickness is generally 5 microns, gravure is about 12 microns, flexographic (aniline) printing ink layer thickness is 10 microns, and screen printing ink layer thickness far exceeds the above ink The thickness of the layer, generally up to about 30 microns. Thick screen printing for special printed circuit boards, ink layer thickness up to 1000 microns. Braille ink is printed in foamed ink, and the thickness of the ink layer after foaming can reach 1300 microns. The screen printing ink layer is thick, the printing quality sense is rich, the three-dimensional sense is strong, this is other the printing method cannot compare. Screen printing can not only print in a single color, but also perform color registration and screen color printing.

3 strong light resistance

Bright color Since the screen printing has the feature of missed printing, it can use various inks and coatings. It can not only use slurry, adhesives and various pigments, but also can use coarser pigments. In addition, the screen printing ink preparation method is simple, for example, lightfast pigments can be directly placed in the ink, which is another major feature of screen printing. Screen printing products have a great advantage of strong lightfastness. It has been shown through practice that the maximum density value range measured after a single imprint of black ink on a coated paper is compared. The offset printing is 1.4, the embossing printing is 1.6, and the gravure printing is 1.8. The screen printing maximum density value range can be Up to 2.0, so the light resistance of screen printing products is stronger than other kinds of printing products, and is more suitable for outdoor advertising and signage.

4 large print area

At present, the size of the area printed by offset printing, embossing, and other printing methods is at most the full-sheet size, which exceeds the full-sheet size and is limited by mechanical equipment. Screen printing can be used for large-area printing. Today's screen printing products can reach a maximum of 3 meters by 4 meters or even larger.

The above four points are the difference between screen printing and other printing, but also the characteristics and advantages of screen printing. Understand the characteristics of screen printing, in the selection of printing methods, you can avoid weaknesses, highlight the advantages of screen printing, in order to achieve a more ideal printing effect.