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CD Screen Printing Disc Printing Process Overview
- May 31, 2018 -

CD-ROM as a printing medium has been in China for more than 10 years. However, since the CD-ROM copying industry is a special industry, the number of CD-ROM printing workers in China has not exceeded 100,000. The author was fortunate to be one of them and was engaged in optical disc printing. Here, I will give an introduction to my colleagues in the process of printing the disc and communicate with my colleagues.

As substrates, the printing methods of optical discs mainly include screen printing, waterless offset printing, and digital printing that has just started in recent years.


screen printing

1 CD screen printing features

Screen printing has the following advantages over other printing methods.

(1) The printing pressure on the disc is small.

(2) thick ink layer, strong three-dimensional sense. Since the UV printing ink is used for the printing of the optical disk, the ink does not shrink after curing, and the thickness of the ink layer can range from 10 to 100 μm. The hiding power of the ink is excellent, and the three-dimensional image is particularly strong.

(3) The printing color is flexible and diversified, and the gloss is good. Screen printing can not only print a single common standard color, but also can perform multi-color overprint color printing, and can also carry out a variety of special metal color and fluorescent color printing, so that the decorative effect of the CD surface is extraordinary, so some international Well-known companies such as IBM, HP, and Microsoft all prefer to use screen printing.

However, there are several disadvantages to screen printing.

(1) The screen printing plate has a long production cycle, and the screen plate made of a conventional photosensitive material does not have high printing durability.

(2) Screen printing has poor accuracy and poor reproducibility. The screen printing image carrier is a screen, no matter how fine the screen, will affect the resolution of its print to a certain extent, so screen printing is not suitable for printing fine products. The maximum number of screens for general CD screen printing is 133 lines/inch, usually 100 to 120 lines/inch. Therefore, when screen printing is used to print optical discs, it is more important to highlight the characteristics of strong three-dimensional screen printing and thick ink layers. The design should avoid weaknesses and gain good printing results.

2. Disc screen printing process

For CD screen printing, the main process elements are screen plates, inks, squeegees and printers. The screen version is the core of screen printing. It is used to control the size, shape, and position of the pattern. It also withstands the pressure of the squeegee and separates the screen from the ink by means of its own tension rebound. The scraper drives the ink to move at a certain pressure, angle and speed and forms an off-web angle. The ink is driven by the scraper and transferred to the surface of the optical disc through the mesh. The printer is a provider of doctor driving force and ink curing energy and is used to support the motion of the optical disc on the machine.

3. Quality requirements and control points

The requirements for optical disc printing are roughly the following.

1 No burr on the edge of the print pattern, handwriting is clear.

2 The print content and color meet the original design requirements and the consistency is good.

3 Printed graphics and the center of the optical disc are symmetrical, and the color registration position deviation is less than 0.1mm.

4 There are no obvious defects on the printing surface, such as static electricity points, dirty spots, white spots, etc.

5UV ink curing and adhesion is good.

In view of the above basic requirements, through the accumulation of several years of experience, I believe that the use of screen printing to print a good CD must control the following aspects.

(1) standard for design of plate-making film

Because the equipment, products and production processes of different manufacturers have their own characteristics, there are different requirements for the film, size, number of printing lines, and even the shape of the dots. In order to ensure the printing quality, there must be a film design standard that meets its own requirements, and careful inspection must be conducted before production. This can avoid unnecessary waste of costs. If problems are found, they can also communicate with customers in a timely manner.

(2) The choice of mesh

Different mesh types, mesh numbers, and different weaving methods differ in the amount of ink penetration and the number of printing lines, and the wear resistance is also different. For high-volume printing, these must be considered. In addition, the average particle size of the printing ink must also be less than 1/3 of the mesh size.

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