During these more than ten years, the laser light source used by CTP is constantly changing, and the plate materials used by CTP are also constantly changing. Plate materials of various wavelengths that have appeared have been formed using two mainstream laser wavelengths, purple laser. 405nm and 830nm of thermal infrared light, of course, there are some CTP plate-making machines using special wavelengths on the market, and the biggest disadvantage of buying this type of CTP plate-making machine is that the choice of plate materials is less, especially those may be exclusive Then, the bargaining power when buying plates is definitely not high. Of course, there are still some CTP plate-making machines that use traditional PS plates. With the continuous expansion of CTP plate materials, the production of traditional plates is on the contrary. The cost of plate materials is getting closer and closer. The price has no advantage, the traditional PS version of CTP gradually disappears.
The production concept of computer direct plate making (CTP) came from the early 1990s and matured at the beginning of this century. At this year's Durpa exhibition, no manufacturers have invested resources to promote it. This shows that the CTP promotion period has passed and has officially taken place. Into the period of use. However, according to the author's observations and some unofficial statistics, about half of the Hong Kong businessmen who set up factories in Hong Kong and the Mainland still use the traditional film plus printing plate for production, but when film printing This version has been used for decades and has been eliminated. When CTP is heavily reused and the usage rate in Europe is as high as 80% or 90%, the traditional method still accounts for 50% of the usage rate. CTP is not suitable for this environment. Use, or are there still many misunderstandings in the user's heart that they dare not use? The main reasons that have been summed up with different industry friends over the years are as follows: one is that the CTP version has poor durability; the other is the cost is expensive, such as the long head of the India is not cost-effective, especially in the Mainland, this can be said to be a The biggest reason that makes CTP difficult to promote. I have made some discussions on these reasons. The classification of CTP plate material and the choice of plate-making machine or let us first look at the classification of CTP plate material.
As for the choice of violet laser or infrared light, it can be roughly divided into two uses in the market. Most of the 405nm violet laser plates are used in high-speed production workshops such as newspaper printing, because of the large structure of purple laser plates , Making the photosensitive time shorter than the thermal version, and the printing durability is longer than the thermal version, but the shortcoming is that the resolution is relatively low, according to the specifications of general plate manufacturers, the purple laser version is 175lpi, 2-98%, but The thermal infrared plate is 200lpi, 1-99%, or even higher. On the contrary, the print durability of the general purple laser plate is 100,000 printed sheets or more, while the print durability of the thermal infrared plate is often only less than 100,000 printed sheets. It can be seen that the purple laser plate is more suitable for newspaper printing or fast printing, and the work with lower printing line requirements, and commercial printing can be said to be the world of 830nm thermal plate.
The plate material of purple laser is divided into silver salt and photopolymerization, and the design of the two plates is different, that is to say, although it is the same purple laser CTP plate making machine, but because of the desire to switch to silver salt In the case of photopolymerization plates, two different platesetters are required, which is very different from the case where the thermal platesetter is almost sharable.
The development direction of CTP plate
In fact, in recent years, CTP plates have developed well on all sides. One is print durability, the other is resolution, the third is sensitivity speed, the fourth is printing condition adaptability, and the fifth is environmental protection. development of.
Let me first talk about environmental protection. With the increasingly strict environmental protection regulations in various countries around the world, although the CTP printing potion does not have the toxic advantages of the traditional PS version. As far as Hong Kong is concerned, there is no explicit regulation on CTP syrup recycling regulations, let alone in the Mainland, but the demand for chemical-free plate materials will definitely increase, and the plate-making machine The chemical processing version is not as good as the general thermal version in terms of speed, and it is obvious whether the speed of 15 folio copies per hour is enough. Relative to the use of ordinary CTP plate materials, the same CTP plate-making machine can produce more than 20 sheets per hour, but whether each factory also needs this production volume is a good calculation. There is no need to compare everything with others. The price is another weakness of the environmental protection version. In fact, several world-leading plate manufacturers have environmental protection plates, but the price is tens to hundreds of percent more expensive than the traditional CTP version, but the author believes that With the promotion of environmental protection regulations, the cost of recycling will increase in the future, and the production capacity of the environmental protection version will increase and the cost will decrease. The use of environmental protection version will be more and more.
As for the printing durability, each printing plant also has different solutions, but one of the two-layer coating seems to be more preferable. The material of the double-layer coating has double-layer coating, one of which is the photosensitive layer, and the other One layer is a particularly resistant film. According to the data, ordinary printing can print 300,000 to 500,000 heads without the? H version, and even millions of prints after the? H version, and UV printing can print tens of thousands to Over one hundred thousand, this is one of the solutions to the CTP version of the imprint resistance.
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