Is the process easy to control?

The social demand for optical disc products is very large, and printing is one of the indispensable processes. Therefore, it is very important to implement a stable printing process. Is there any easy-to-control process for pad printing on optical disc printing? The answer is yes.

1. Disc printing ink is very mature

The pad printing ink has developed into a special series. It not only has the adhesion to the PC material, but also begins to pay attention to some characteristics of the optical disc. Optical disk printing ink requires a certain temperature resistance and friction resistance to resist the negative effects of the laser reading and writing process; the optical disk is also often touched by hand sweat, requiring better resistance to oil; for the background ink, in order to improve the reading and writing of the optical disk The reflectivity is high and the hiding power is high. These are not difficult things. The ink pad printing inks manufactured by major ink manufacturers can basically meet these requirements.

Some less demanding discs may be primarily represented by simple color patches, but discs involving hierarchical requirements require four primary color disc inks. These are very simple things for other printing methods, but in the pad printing industry, there are still some people who are arbitrarily chosen to use four-color inks, so it is impossible to print the ideal optical discs. Most of the employees in the printing industry may not have professional printing knowledge, and there is a lack of understanding of why four-color inks must be used.

2 printing plastic head change

A pad printing head is a relatively independent pressure device that moves the ink over and over the printing plate to move back and forth over the printing material. The change in its own size is generally not affected by the structure of the machine. A machine can often be equipped with several plastic heads to print products with different printing areas, thus greatly enhancing the adaptability of the product. For disc printing, the shape of the plastic head is basically the same, and we can all make a hollow plastic head with a hollow center. Some special-shaped discs and business card discs, we can use rectangular plastic head.

The hardness of the plastic head is another indicator. As a result of the flat pressure of the plastic head, the pressure in the central area of ​​the plastic head is significantly greater than four weeks. If the approximate Hooke's law is used to explain, that is, the amount of compression at the edge is relatively small, the amount of compression in the central area is relatively large, and the hardness of the plastic head The larger the printing in the edge area, the greater the pressure. Of course, if the plastic head is very soft, although the printing is easy to achieve, but for a finer disc, there will be graphic problems. This can be solved by changing the degree of curvature at the bottom of the plastic head. If you print finer images and halftone images, the hardness of the rubber head should be larger, but the curvature of the bottom should be smaller; on the contrary, the hardness of the rubber head can be appropriately small, but the curvature of the bottom is required to be larger. .


3. The fixture is handy

One of the important reasons why the special printing industry is special is that the product shapes it involves have never been unified like paper, so almost every product has to be made with a special fixture. The optical disc has been standardized, and the shape of the most common 120mm optical disc on the market is very fixed. It is very simple to make such a fixture, and it is not difficult to make a special optical disc fixture.

Although fixture production is simple, sometimes there is no commonality and printing can be difficult. Due to the shrinkage rate of the plastic product, the final product's external dimensions are actually different. If the error is large, the production of the fixture may be tricky. It may be difficult for you to produce it, but it cannot be produced on a printing press.

Although most CD-ROM manufacturers provide highly standardized CDs, you must be good at measuring these products. If you exceed your standards, you must try to solve them. Otherwise, over-printing problems will always trouble you.

4 resin version outlets are good

If the optical disc requires a relatively high print quality, it is best to use a pad printing resin plate. This is a polymer version, with a mature platemaking technology. The resolution and resolution of the printing plate is much higher than that of the steel plate. It does not require an etching process, so there is no one that causes headaches due to corrosion. Line defects and inconsistencies. Pad printing resin plates are easier to make into a plate structure, which is undoubtedly a good thing for those who use landscapes and characters as the theme of the CD picture.

The application of the resin plate is not much different from that of the steel plate. The ceramic plate is installed on the traditional pad printing machine, and the resin plate is firmly sucked on the surface of the steel plate. Others are basically the same as the steel plate. In order to improve the resistance of the resin plate, it is also good to replace the steel blade with a squeegee with a hardness of 85 degrees on Shore. However, the resistance of the resin version is not high, and printing large-volume discs may require more plates. The application of the resin version is also limited to those companies whose manufacturing standards are in place. Otherwise, the printing process is likely to be in great trouble. If the ink is not clean, the deinking of the plate is not very good.

5. The disc printing machine is stable and reliable

Two-color and five-color optical disc printers have already entered the market, and customers are still very much in the market. The two-color disc printer is mainly based on spot color patches and transitional color discs. There are 57% of discs on the market with only two colors, and the color is only a gradual effect. This printer is suitable. There are 43% of optical discs that need fine landscape paintings or figure paintings. They must be printed on a five-color disc pad printer. They include white underlays and four-color overlays.

The current optical disc printers are all composed of a disc transport device, a disc printing device, and an automatic control system. The disc transport device can accumulate the discs on the conveyor belt into a stack of 50 at a time, and is strung by a stainless steel column with a diameter of 14 mm. When the sensor at the top of the column detects the presence of the disc, the manipulator sucks the disc onto a special fixture on the rotary table. The table rotates into the printing position. The sensor issues a command to the control circuit and the plastic head presses down to start printing. Throughout the printing process, the disc is always in one position and overprinting is accurate.

The multi-color printing machine for CDs has two major features compared with traditional multi-color printing machines: one is that the conveying process of the products is fully automated, unlike the screen printing, which requires manual picking and placing; the other is that the disc enters the next color program It is a large disc table controlled by a precision angler, which is much more efficient and accurate than a conventional table.

As can be seen from the above description, these pad printing machines use solvent-based pad printing inks. Due to the relatively fast drying speed, practically no problem arises on a multi-color pad printing machine.

CD UV printing process

Multi-color screen printers using solvent-based inks have not been successfully accepted by the market. We cannot tolerate a high-speed machine that always stops to wipe the blocked mesh. This creates many potential problems: Production The efficiency is seriously affected, the color of the disc is not uniform, and a large amount of waste products appear. This is the reason why it must use UV ink, and the use of UV ink will greatly complicate the structure of the machine.

The successful use of solvent-based inks in pad printing does not mean that we have not paid attention to the progress of UV technology. In fact, the development of UV pad printing technology has been continuously carried out both theoretically and practically. UV pad printing inks will make the print coating better quality, more wear resistant, and higher gloss.

CD UV printing process:

Optical Disk Conveying - Disc Overlay - Disc Inspection - Printing on White - UV Curing - Four-Color Pad Printing - UV Curing - Finished Discs

The above pad printing process has been proved to be feasible by practice, but it can be seen that it does not protect the picture layer by UV varnish coating as offset printing. This is the current status of pad printing. Many manufacturers finally use a monochrome screen printer to apply a layer of UV varnish to compensate for this defect.

It is not particularly troublesome to install a UV curing device on a multi-color pad printing machine because multi-color screen printing machines have had very successful experience. The key is that we must look for specialized UV pad printing inks. If the UV printing technology of optical discs still needs further study, we must find a more mature and stable optical disc UV printing ink.

Optical disk printing technology is a relatively young technology. Therefore, it must learn from the features of other mature printing technologies in order to continue to mature. In the 21st century, the development of engineering technology has a wide range of significance in terms of integration and deepening, and printing technology is no exception. In terms of integration, there is a close relationship between printing, screen printing and offset printing. The formation of a more mature printing technology should receive attention; in terms of deepening, any printing technology is constantly drawing high-tech blood. The direction of full recognition by operators, environmentalists and business managers.


Source: Chenyi Online

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