Six elements of screen printing

Graphic original, screen printing, scraping scraper, ink, printing machinery and substrates are the six elements that constitute screen printing, their common role constitutes a wide range of applications, bright colors and strong three-dimensional, good light resistance and can be printed on a large area of screen printing technology. It is common in cosmetic packages, such as in cosmetic jar, lotion bottles.

As screen printing screen printing plate, scraper scraper, printing machinery, the three variables are not very large, the real impact on the success or failure of screen printing products is the pre-treatment of substrates and the correct choice.

The basic principle of screen printing is: the use of screen printing plate graphic part of the mesh permeable ink, non-graphic part of the mesh impermeable to the basic principle of printing.

Printing in one end of the screen printing plate into the ink, with a squeegee / scraper in the screen printing plate ink parts to apply a certain pressure, while moving toward the other end of the screen printing plate. The ink is squeezed by the squeegee from the mesh of the graphic part to the substrate during the movement.

Due to the viscous effect of the ink and make the print fixation within a certain range, the printing process, the squeegee is always in line contact with the screen printing plate and substrate, contact line with the squeegee to move and move, because the screen printing plate and substrate to maintain a certain gap between the screen printing plate through its own tension and produce a reaction force on the squeegee, the reaction force is called rebound force. Due to the role of rebound force, so that the screen printing plate and the substrate is only mobile line contact, while the other parts of the screen printing plate and the substrate for the disengaged state. So that the ink and screen fracture movement, to ensure the printing size accuracy and avoid rubbing dirty substrate. When the scraping rubber scraping over the entire page lifted, while the screen printing plate also lifted, and the ink lightly scraped back to the initial position, to this point for a printing stroke.

Screen printing can not only be printed on a flat surface, but also on curved surfaces, spherical and concave and convex substrates for printing, regardless of the texture of the substrate restrictions. Therefore, it is also widely used on plastic bottles made of plastic PE, PP, PET, etc. Such as PE bottle, PP bottle.

In view of adhesion considerations, it is difficult to form fine screen printing on untreated PE and PP plastic bottles. Therefore, before screen printing, it is often necessary to polarize the plastic bottles, and although there are various methods, the industry generally chooses to use the flame treatment method. In this process, O, N0, OH and NH and other free radicals produced in the flame can extract the oxygen from the surface of PE, PP, etc., and improve the adhesion fastness of the screen printing on the plastic bottle by changing the wettability of the surface of the plastic bottle without polarization, thus ensuring the stable formation of fine patterns.

At the same time, the choice of screen printing is also crucial.

Some can be screen printed on the PET bottle without treatment, can get high adhesion effect; some, with good adhesion, fluidity, chemical resistance; some, with flexibility, chemical resistance in the treated plastic bottle performance, good adhesion; some, with fine particles, high color density, good printability characteristics.

Therefore, in the screen printing process of personalized plastic bottles, the choice of plastic bottles should not be ignored.