Why should we choose flexo CTP

CTP is a turning point in the development of prepress technology. It plays an important role in printing. CTP technology has developed rapidly, and has been applied in the fields of commerce, newspapers, and packaging and printing. Today, flexo CTP is suitable for printing in different sizes in packaging, wallpaper, beverage boxes and other fields, and its quality has been widely recognized.

Flexographic printing is one of the most commonly used printing methods at present, due to the unique characteristics of traditional printing methods. As a relatively new printing industry in China, flexographic printing has made considerable progress in recent years. The water-based ink used in flexo printing is an environmentally friendly printing method, and unlike gravure printing, there will be a lot of pollution. Relatively speaking, the cost of flexo printing is relatively low, and the printing volume is large. It is suitable for the printing of sheet paper and web materials of different materials. It is most suitable for packaging printing and various labels and large-area substrates.

1. Features of flexographic printing

Compared with traditional offset printing, gravure printing, and relief printing, flexographic printing has the following characteristics:

1. High production efficiency. Flexible printing uses roll material, which can not only realize the double-sided printing of the printing material, but also complete the online light, bronzing, die cutting, waste discharge, and rewinding work;

2. A wide range of printing materials, such as paper, plastic film, aluminum foil, adhesive paper, etc .;

3. The printing quality is good, and the printing accuracy can reach the number of offset printing lines, which is especially suitable for packaging printing requirements;

4. The use of new-type water-based inks and solvent-based inks fully meets the requirements of green printing and can also meet the requirements of food packaging;

5. Shorten the production cycle, save materials and manpower, reduce production costs and improve efficiency.

Second, the traditional flexographic process

Computer documentation → Digital proofing or blue paper pattern → Adjust the corresponding dot expansion compensation curve according to the printed Fingerprint → Photograph output negative picture film → Exposure of the plate to the traditional plate material → vacuum the front of the plate material and the film The main exposure of the film surface after closing → remove the film and put the plate into the plate washing machine, wash the plate with solution → plate drying and post-processing such as UVA and UVC → after checking the size and modifying the edge → complete the traditional flexible printing plate production.

3. CTP flexo plate making process

Computer documentation → Digital proofing or blue paper pattern → Back exposure of the digital plate by the printing machine → Main exposure of the digital plate on the front of the flexo CTP → Put in the traditional plate washing machine, wash the plate with solution → Plate drying and UVA , UVC and other post-processing → check the completion of digital flexible printing plate production.

4. Interpretation of Flexo Process

In the flexographic printing process, there are often some terms that are different from the traditional plate making, we explain as follows.

Plate cutting: according to the size of the negative image, choose the appropriate layout size;

Exposure of the back of the printing plate: the thickness of the formed substrate ensures that the depth of the relief meets the requirements. Activate the plate to save the main exposure time;

Front exposure: first remove the protective film on the surface of the printing plate, closely fit the film surface of the negative film and the photosensitive film surface of the printing plate, cover with a vacuum film to form a negative pressure, and then expose the printing plate to expose the light The photosensitive material is cross-linked and hardened to determine the graphic slope and dot size;

Development: use tetrachloroethylene or environmentally friendly solution to dissolve the photosensitive material in the unexposed area, thereby forming a relief;

Drying: The developed printing plate needs to be dried under hot air to evaporate the solvent inside the plate, shrink the material, and restore the original thickness of the raw material;

Post-sticking treatment: remove the tackiness of the resin by UVC to the printing plate for a period of time, increase the smoothness and hardness of the printing plate surface;

Post-exposure: Perform a comprehensive and uniform exposure of the dried printing plate once, so that the hardened resin inside the plate is completely cross-linked, and will not be deformed by the influence of ink or solvent, and improve the printing durability of the printing plate;

Install the plate to the drum: After cutting the required size, install the plate on the drum according to the prompt of the computer. At the same time of installing the plate, there is a vacuum suction plate inside the drum;

Laser imaging exposure: The digital signal from the desktop system controls the laser in the flexo CTP through the computer, the drum rotates, and the laser head moves along the drum axis for exposure. [next]

Fifth, the characteristics of flexo CTP

At present, the flexographic direct plate making equipment that everyone is familiar with, one is a system that uses argon ion (Yag) laser imaging (Esko and Dupon company equipment), uses digital signals to command the YAG laser to generate infrared light, and the black synthetic film is coated. On the photopolymerization plate, the black film is ablated by laser to form a negative image, and then the same processing steps of exposure, rinsing, drying and post-exposure as the traditional plate-making method are performed to make a flexible plate. The other is a system that uses laser diode imaging. There are two types of optical fiber transmission and laser tube array (Kodak company equipment). The plate making principle of the two types of equipment is basically the same.

The flexographic printing plate is composed of a resin base, a photosensitive resin layer, a black laser absorption layer on the photosensitive layer, and a protective sheet. The photosensitive resin layer is the same as the ordinary flexographic plate, and the black laser absorption layer can be ablated by laser The exposed photosensitive resin layer is exposed, and the ablated laser absorption layer functions as a film, so no film is needed, and no vacuum is needed when printing. If you use CTP flexible plate also has the following advantages:

1. The dots from 1% to 99% can be reproduced during printing;
2. Effectively control the expansion of small outlets.
3. Stably reproduce the middle-level outlets.
4. The details in highlights and dark tones are preserved, both flat and gradient meshes are very smooth.
5. The same needs ultraviolet plate-making machine and processing machine, the existing equipment investment will not be wasted.
6. Effectively shorten the plate-making cycle;
7. When digital flexo printing, the center point first touches the printing material, while the traditional flexo is that the edge of the dot first touches the printing material, so it is easy to cause hollow dots, digital flexo does not have this problem.
8. Compared with traditional flexo plate making, the lines are clearer and the thickness changes are easier to control.

6. Special technology of flexo CTP

Hybrid flexible version screening technology is to use FM screening technology in the highlight part of the image (10% to 15% or less), and use traditional amplitude modulation in the midtone and dark tone parts (more than 15% of the dots). Screening technology. The size of the FM screening dots is about 50 microns. After screening with Hybrid technology, the dots with a diameter of only 50 microns will have relatively large abrasion at the tip when the plate is washed, so it will be lower than the average height of the large dots, which is effective To reduce the expansion of outlets.

In the 1% -10% highlight and 90% -99% dark tone areas, the special screening technology uses a fixed-size dot, and changes the density of the dot to achieve the reproduction of the tone change; while in the 10% -90% The middle tone, by changing the dot size like amplitude modulation screening, reproduces the tone, called MaxTone. Initially, this technology was tailored for flexo printing, and now the technology can be used in any printing process. Kodak introduced MaxTone screening technology, which allows users to define a minimum mesh adjustment dot size of micron level, and allows the screening engine to remove the mesh adjustment dots in a random way, while ensuring that each dot is larger than the specified dot. Maintain the integrity of the entire color tone, so that the highlight part can be copied very well. This is Hyper Flex technology. MaxTone is currently an optional item in the Prinergy package workflow.

In addition, in the processing of pre-press trapping, some improvements can be made when using the CTP plate-making method. The trapping is mainly designed to compensate for the registration error of the printing press, but the trapping also brings another undesirable result, that is, the original design scheme will be changed in a small part. For example, if there is 0.15mm overprint at the junction of the magenta block and the blue block, the purple line with a width close to 0.15mm will be generated adjacent to the two color blocks. This is not the case for some of the more demanding products. accept. In the CTP process, we can use the advantages of the CTP printing plate to support the slope of the base and the clear edges of the printed lines. We can adjust the thickness of the registration line of the entire set of color plates. The 0.1mm is improved to 0.05 ～ 0.07mm, and the overprint in the living piece can be adjusted to about 0.07 ～ 0.1mm.

With the digitization in the prepress field and the improvement of flexo CTP technology, the continuous development of mechanical cylinder precision and laser technology, the sleeve technology has gradually matured in the field of flexo platemaking. The essence of sleeve technology is an extension of CTP technology in flexographic printing. If the printing plate is made on the sleeve, the flexible plate can be made on the printing machine. And using this method can achieve accurate positioning of the laser beam, achieve good overprinting and continuous seamless printing, so as to effectively save time and a large amount of tube paper.

7. Flexo CTP Market

With the improvement of printing technology and printing environmental awareness, flexographic printing has been accepted by more and more people. At the same time, the CTP technology of flexographic printing has also become a hot topic. In countries with developed printing industries such as Europe and the United States, flexographic printing Rapid development, packaging printing has changed from gravure and offset printing to flexographic printing. About 70% of packaging materials currently use flexographic printing. With the continuous application of new technologies, flexographic printing Great progress has been made in printing. The quality of products is directly after offset printing and gravure printing, and it has strong market competitiveness.

At present, the domestic flexographic CTP version is mainly used for printing high-end printed products. According to statistics, there are more than 40 domestic enterprises engaged in flexo platemaking, but only 10 companies have installed flexo CTP platemaking equipment. Many domestic enterprises are satisfied with the quality of CTP plate making. From the comparison of more than 1,000 sets of flexo printing CTPs in the world, compared with ours, there is still a certain gap between us and the world's advanced level. However, we also see that flexo CTP has not only started in China, but is also developing at a fast and high starting point. The domestic annual consumption of flexo plates is now about 20-40 million square meters, with the development of flexo printing As the amount of plate making increases, the existing flexo CTP can no longer meet the requirements of use. We believe that with the joint efforts of industry colleagues, flexo CTP will surely develop well in China.

Kodak's ThermoFlex high-efficiency flexographic direct plate-making machine is one of the core laser direct plate-making equipment on the market. It is a typical offset CTP technology that extends in the flexo industry and has a good reputation in the flexo-plate industry. Kodak's products are positioned in the mid- to high-end flexo market, and are mainly used in the production of high-fidelity packaging, films, folding cartons, multi-layer paper bags and fine corrugated boxes. A few days ago, a ThermoFlex Wide II large-format, full-featured flexo CTP has been installed in Shenzhen Luolanxin Laser Technology Co., Ltd. It can not only output large-format flexo but also sleeve flexo, and is in good working condition.

The current flexographic plate-making technology is developing in a simpler and faster direction. With the technological advancement of flexographic plates and flexible inks, the printing quality of flexographic plates can fully meet different requirements, and the proportion of flexographic printing plates in the entire printing market will also increase. We look forward to direct platemaking and traditional flexographic printing plates CTP can generate benign competition to a certain extent, form a mutually inclusive situation in the domestic market, and ultimately provide customers with a full range of printing services at lower prices and better quality.

The brush is basically composed of a brush handle, a metal joint handle and bristles. The brush handle is divided into long handle and short handle. You can choose the length of the brush handle according to different makeup habits of each person, and you can use it comfortably. The metal joint handle is mainly used to join the brush handle and the bristles. When cleaning, you should not pull vigorously. Soak water for a long time so as not to shorten the service life of the brush; the bristles are the most important part of the brush and can be roughly divided into natural animal hair and synthetic hair: animal hair is very soft and comfortable to use; and the material of synthetic hair is relatively hard , But better flexibility. Depending on the brushes with different functions, you must choose the appropriate bristle material. The Blush Brush needs thick and light bristles. The animal brush is the most suitable. The bristles must be large, soft and well-made.

Blush Brush

Blush Brush,Blusher Brush,Angled Blush Brush,Blush Makeup Brush

Henan Daxin Cosmetics Co., Ltd. , https://www.dx-cosmetics.com