Screen printing
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: 860681365@qq.com
1. Looking at the development prospects of screen printing from the point of view: For the steadily moving forward and developing screen printing, it is necessary to realize the modernization of equipment and technology. In order to improve its cost performance and keep up with the pace of economic and social development, the most important thing is to improve the speed on the basis of ensuring the printing effect.
2, the characteristics of screen printing;
(1) substrate ink is very thick
(2) can be printed with various inks
(3) printing pressure is very small
(4) layout soft
(5) The shape and size of the substrate are limited
3, screen printing: with bright color effects, excellent light resistance, suitable for long-term display, outdoor advertising is full of expressive, eye-catching posters and posters. Very suitable for printing prints with visual effects.
The main five variables in screen printing: (1) scraper hardness (2) mesh distance (3) printing speed (4) scratch pressure (5) ink suitability
The variables that affect the mesh distance are: frame size, screen tension, squeegee length, image area relative to the frame size, and image type (such as large area solid and reverse image, if the surface area is in contact with the substrate). Large, the network distance is required to be large)
4, screen tension is the influencing factor of the grid distance adjustment is also an important factor affecting the quality of printing!
When the tension is too large: the separation speed between the screen and the substrate will be faster than the running speed of the blade, causing the blade to deform, and the mortar may also fall off due to excessive tension.
If the tension is too low: the screen is easily degummed under continuous expansion and contraction.
Inappropriate mesh spacing can adversely affect print quality, resulting in poor copying accuracy, smudging, blistering, ghosting, ink sticks, missing levels, blurred edges, mesh marks, incomplete images, and inaccurate overprinting. If the mesh distance is too large, the screen will rebound too quickly so that the ink cannot be fully transferred to the substrate, causing the screen to appear in the screen, the image is incomplete, the ink bar, the bubble, the edge of the image is blurred, and the printing speed is slowed down.
The correct spacing should be such that the screen has a minimum tension during the screen printing process and the screen can rebound immediately. Adjust the mesh distance 1, improve the tension of the screen, and the tension of the screen is high, so that the mesh distance can be reduced and the printing speed can be accelerated. (The tension of one screen can be selected from 18-25 (cm) multi-color printing, and the tension of each screen should be consistent to ensure the uniform spacing of each screen, ensuring the printing sleeve between color and color. The same printing pressure.
5, the viscosity of screen printing ink, thixotropic and leveling
In the production practice, due to the difference of products, the requirements for the thixotropic leveling of screen printing inks are also different, so in the production practice, the screen printing ink should be selected according to the needs of the products. The ideal value for adjusting screen printing inks to thixotropic and leveling in long-term applications is a sign that raises screen printing technology to a high level.