Analysis: Several non-mainstream output methods of CTP

When it comes to non-mainstream output, what is the mainstream approach? The mainstream output machine has the inner roller machine and the outer roller machine. Therefore, the platform is non-mainstream; the light that allows the plate to be imaged, the mainstream has a sense of red, green, blue and violet visible light, and 830nm, 1064nm infrared, etc. Visible light, others are non-mainstream.

1, non-mainstream thermal

There are more non-mainstream output methods in terms of thermal sensitivity, including: A must be preheated before rinsing, B phase change-free flushing, C thermal no horizontal printing plate in three ways, the mainstream is thermal stencil directly, and Free warm-up direct version is to pick up the hot banner.

Thermal non-mainstream output method (A) - must be warmed before the plate version

The thermal sensation must be preheated. It is originally the mainstream of the thermal CTP plate, but it must be heated before entering the plate after sensitization, so that the sensible part can act on the photosensitive layer and catalyze the formation of a chain reaction from the surface to the underlying surface. Completely embossing the bridge resin bonding effect from top to bottom.

This approach seems to be a bit out of date, from the mainstream to the non-mainstream format, but its biggest advantage is the negative film exposure, the natural way to form a print pattern with the photosensitive part, so it is still used in the long version of the commercial and printed newspaper rotation The typography machine can only perform the exposure of the imprint formation section, and the edition mouth and the edition tail are areas that do not need to be exposed. Therefore, the area is small and the speed is fast. In addition, the negative heat version can be baked and re-exposed. The hard-printing, high-resistance printing capacity, and printing of 200,000 printing plates for long-term printing, if baked, can increase printing capacity to 400,000 copies, which has a positive effect on mass publishing and newspaper industry. Although it is more troublesome, and the conditions of heating will also affect the edition and reproduction of the outlets, but the 1200dpi newspaper requires that the outlets have a slight increase and the impact is not large, so the old method of heating and then flushing after the heat is not the mainstream hot version. However, because of the negative photographic sensitivity and resistance to India, it will continue to be used in this area for a long time.

Thermal non-mainstream output method (B) - phase change free thermal version

The phase change-free heat-sensitive version, published by Asahi Kasei Corporation, is mainly coated on the thermal layer of the plate. It is usually hydrophilic, but after the thermal exposure, the coating layer is lipophilic in the printed area. The use of ink in the lipophilic printing area is unique in the free-flow printing of thermal printing plates. Whether or not it can be commercialized in the future remains to be seen, but if it can be used, it will be the best plate for DI water machine on board. Because there is no shedding and debris.

Thermal non-mainstream output method (C) - Thermally non-horizontal printing plate

The thermal plate has no horizontal plate. Most of it uses the infrared thermal energy of the laser to make the adhesive layer of the non-horizontal printing plate fall off and become a part of the ink that can stick ink. At present, it is mainly based on the United States Presstek and Japan Toray. However, although DI is still using Presstek as a plate material, although the technology is quite mature, the cost of the plate material has not been reduced. Therefore, it cannot be greatly expanded and a special non-mainstream CTP plate is formed.

2, non-mainstream UV and general PS version

Using ultraviolet light and general PS version of the CTP method, UV setter of German Basys Print company, the most important selling point is the working environment is very open, as the printing room, the second is to find a higher sensitivity version of the PS version, the first Third, the machine is based on XY axis movement exposure, without any rotating elements, better maintenance. The biggest feature is a block mirror, which contains many small masking mechanisms to form the core of resolution and control. It is preferable to use a negative film version for the imprint because accurate exposure can be performed in the printed area, and no imprinted portion can be moved quickly or without passing in order to save the exposure time. This advanced concept uses traditional materials and should save costs. However, the machine is expensive and there are not many people currently buying it, so it is still developing in non-mainstream areas.

3, non-mainstream thermal ribbon imaging

Thermally sensitive ribbon imaging CTP, this method is currently only Manroland DicoWeb is in use, I believe that other manufacturers will also quote this reusable, light-sensitive, thermosensitive layer coating, only the material used in thermal impression tape In this case, consumables can be reduced by a lot, and it is also very beneficial to environmental protection. However, it is still necessary to make efforts to increase the amount of printing.

4, non-mainstream platform sensitive

Small-size CTPs mostly use platform-type sensitometry. However, the XY axes of the block light source described in the third item are different from each other, but the plate is moved in the X-axis, and the light source is scanned linearly from one side to the other along the Y-axis. , With the X-axis movement to form a photosensitive surface, and some mining Ling mirror movement, some mining different light speed section exposure, fewer moving components.

5, non-mainstream inkjet imaging

There are two ways to use inkjet CTP: one is to directly use the oily ink to spray on the blank plate for imaging, which is cheap and easy, and the printing capacity is between one and twenty thousand copies; the other one is on the positive PS plate. The shading method is mainly to avoid negative film, but after the ink jet pattern is printed, it must be exposed and developed again. All printing conditions are like the traditional PS version. If you use 600 dpi ink jet, you can only do rough work. Switching to dpi or more is very useful. If the 1800dpi ink dot is reached, it is very finely available. This is an inexpensive CTP method with potential for future development.