Pad printing process discussion equipment

Pad printing equipment

Commonly used printing equipment introduction

China has developed rapidly in recent years. Western countries’ advantages in traditional industries have gradually been replaced by China. In order to protect the development of domestic industries, some countries in Europe and the United States have formulated a very strict market access system to restrict Chinese products from entering the EU market. Products manufactured by companies exported to the European Union conform to ISO14001 environmental standards. Objectively speaking, the technical barriers between European and American countries are very unfavorable to Chinese companies. However, in the long run, the pressure imposed by these institutions on Chinese companies may force us to adopt new technologies to improve our country. The technical and safety level of the product. Performance in the field of pad printing technology, the use of more environmentally friendly technology must attract the attention of Chinese companies.

The solvents in solvent-based inks of oil-pad printers are volatilized into the air and captured by the human respiratory system. Most of them are harmful to the human body. This has been met with widespread resistance from western societies that protect personal safety. The countries of the Americas have successively formulated stringent regulations to control the use of solvent-based inks. Germany first produced a pad printing machine that cut off solvent volatilization by cutting off solvents. This is the oil pad printing machine. The main difference between it and the traditional open printing machine is the difference in ink supply.

The ink supply part of the oil pad printer uses ink and solvent cartridges that are refastened on the pad plate to continuously supply ink to the plate. Since the solvent is volatilized, the viscosity of the ink during use is controlled. And the change of the drying speed tends to be stable, which is more conducive to obtaining uniform and consistent printing quality. The stability of the open car is the most commendable advantage of the ink pad printing machine. The effective reduction of solvent evaporation also improves the operating environment of operating personnel. It is worth pointing out that the manufacturing level of the ink pad printer reflects the level of manufacturing of a company. At present, there are only a handful of companies in the country that are making quality ink pad printers.

Oil squeegee pad printer and oil pan pad printer

The oil pan pad printing machine is a widely used pad printing machine at present, but it has the disadvantages of serious pollution and waste of ink. With the rising environmental protection demand, the market is increasingly skeptical about its existence, especially those applications or acquisitions. ISO14000 certified companies, its use is subject to restrictions.

In the current situation where UV inks are not commonly used in pad printing technology, ink pad printers have become popular with customers.

The ink pad printer seals the ink and the opening water in the oil pan. The harmful solvent evaporation is effectively controlled. The relevant data proves that: the volatilization of harmful substances is reduced by 87% compared with the oil pad printer, and the ink consumption is reduced. 26%, but due to the high precision of the manufacturing process and the difficulty of manufacturing, the price is more expensive than the oil pan type pad printer.

From an environmental point of view, the oil-pad printing machine is not completely eliminated the volatilization of harmful substances, so the use of UV pad printing ink is the final choice.

UV Technology Challenges The advantages of the oil-pad printer The oil-pad printer has gained the favor of companies that are applying for or have obtained ISO14000 environmental management certification. However, we cannot but admit that the ink pad printer is not absolutely Eliminating environmental damage. A part of the solvent enclosed in the oil crucible reaches a dynamic equilibrium inside the oil crucible, and the other part is transferred to the surface of the product together with the pigment and the resin. The solvent finally needs to evaporate into the air. The main function of the oil crucible is to put the solvent in the ink. Volatilization becomes effective volatilization. Whether it is the ink loading process or the cleaning process, we can't completely rule out the volatilization of the solvent. Therefore, the ink pad printer will face the challenge of UV pad printing sooner or later. UV technology is an environmental technology that became popular in the 1980s. It uses photosensitive inks based on acrylic resin as a substitute for long-standing solvent inks. In the field of offset printing, gravure printing, flexo printing, and screen printing, UV technology is gaining popularity. In contrast, UV printing technology is late.

The reason why UV technology is progressing slowly is because the development of UV inks faces some difficulties, as mentioned above. Any new technology will face various difficulties, but there is no difficulty to stop the development of UV printing technology. As more companies pay attention to UV printing technology, the popularity of UV technology in the printing field is sooner or later.

Because of the successful development of UV inks, the major obstacles to UV technology have been removed. Other related technologies can be put into production with only minor modifications. For example, the products involved in pad printing are relatively small, and it is easy to implement a miniaturized curing device. The pre-processing, printing system and curing device integrated pad printing machine should be on the agenda. I believe that in recent years will be the critical period for the further perfection of UV printing technology.

Product recommendation - classic four-color pad printer contrast

New highlights of printing machine technology

The development of printing machines toward automation should be the consensus in the industry. This is the fundamental way to increase production efficiency and reduce costs. It is also an inevitable requirement for the shift of printing technology from labor-intensive industries to technology-intensive industries.

At present, the high degree of automation of the printing machine is more common is the rotary transfer printing machine, in the printing process is completely automatic, but the process of placing the workpiece and removing the workpiece still rely on manual. The degree of automation is affected. The vast majority of manufacturing companies still have imperfections in their consideration of the quality issues that arise during the printing process. Even such a printing machine must face many challenges if it is to achieve true automated printing.

Web printing machines There are two types of paper feeding methods for any printing process: one is a sheet and the other is a web. There is no machine for printing webs in the pad printing process. As mentioned above, pad printing technology is the only technology that does not integrate with paper printing. If the printing process does not have an advantage in paper, it should be mainly attributed to the large size of the paper. But printing like a conventional sticker paper may not be a mystery. It has no technical problems in printing paper and paper. Its printing area is very small. Compared with resin-type adhesive printing presses, it is less difficult to manufacture, it is more convenient to operate, and the price of the machine is lower. From a technical point of view, since screen printing can be used for web printing, there is no problem with pad printing on webs. Through our understanding, some manufacturers are working on the development of monochrome web printing machines. It is estimated that prototypes will be available within one year.

Pad printing machine with cleaning device Japan first installed a plastic head cleaning device on the pad printing machine to improve the printing quality. In the printing process, since the ink on the surface of the plastic head cannot be completely transferred to the printed matter, the residual ink of the resin will gradually change the edge of the graphic trace on the surface of the plastic head, causing the sharpness to decrease. There are two ways to solve this problem: one is to improve the deinking ability of the plastic head; the other is to install plastic head cleaning device. The features of the plastic head cleaning device are: In the process of retreating the printing plastic head, one more printing action is performed on the adhesive paper than the ordinary printing machine, and the residual ink on the surface is removed.

For multi-color printing, the improvement of overprint accuracy is obvious with the addition of cleaning devices. If multi-color printing involves dot duplication, the phenomenon of dot gain will be significantly curbed. At present, the domestic printing machine has not appeared in the trend of adding plastic head cleaning devices. It may be related to our understanding of the printing technology. We always think that: printing is not a very fine printing technology, and it does not need to be over-printed. The details of the process.

Accurate multi-color pad printing machine The traditional rotary pad printing machine has a higher production efficiency, but the accuracy of overprinting is worse, not to mention that fine dot printing cannot be completed, it is not easy to require slightly higher color pad printing. thing. This is related to its own structural defects. In 2003, a Japanese printing machine manufacturing company took the lead in introducing a new four-color pad printing machine. This multi-color pad printing machine has a very different form of movement than a traditional multi-color pad printing machine; it is rotated around a central axis. Four groups of plastic head systems constitute a printing device, each printing is rotated by 90°; the ink supply device is constituted by four groups of printing plates rotating around another rotating center, and each printing head also rotates by 90°, and each group of plastic heads is only fixed The printing plate contact, overprint is very accurate. The pad printing machine uses two precise rotating cylinders to control the rotation of the rubber head system and the printing plate system respectively. The structure is compact, the movement is coordinated, and there are almost no components machined, so the overprinting effect is very good.

Many craft gifts need careful printing. If overprinting is inaccurate, it will inevitably affect the value of the product itself. Developing an overprinting printing machine does not seem to be an optional matter. If we do not have a better design idea for the time being, it may be Learn from the above examples.

Source: PACK.CN

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