The hottest rising star of colorful stereo printin

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Colorful: rising star of stereoscopic printing

in recent years, the domestic stereoscopic printing market has developed greatly, and a number of well-known enterprises have emerged, such as Wuliangye Pushi 3D Co., Ltd., Beijing colorful printing Co., Ltd. Beijing colorful printing Co., Ltd. (hereinafter referred to as colorful) is an enterprise with business characteristics in the north. This paper will take colorful as an example to introduce the practice of stereoscopic printing in domestic printing enterprises

seeking differentiation

at present, it is an indisputable fact that printing enterprises face fierce competition. This is what all enterprises seeking development must face. With the intensification of market competition, the difficulty of sustainable development of enterprises has also increased. In accordance with the market strategy, it is the key for enterprises to grasp the operating characteristics and maintain competitive advantage. The reason why colorful is engaged in stereoscopic printing is inseparable from its development track in recent years. Mengzhiwen, general manager of colorful, summarized the development of the company into four stages. The first stage, the introduction and production of Heidelberg equipment, corresponds to the initial stage of capital accumulation without choosing business; The second stage is to expand the scale of enterprises through capital accumulation; In the third stage, two Komori folio four-color printing machines have been launched successively. After the company's products occupy a certain share in the market, it is clear that the orientation stage is to take business printing as the development direction; The fourth stage is the current stage. With the introduction of UV offset press, colorful began to enter the packaging printing market with plastic as the printing material, including stereoscopic printing

based on this, colorful firmly blazed a path of differentiation with colorful characteristics. In order to expand the special printing market and optimize the company's movable parts structure, colorful has specially set up the "three-dimensional printing process research and development and market promotion" project, focusing on the research, development and promotion of this new technology

production control experience

years of stereo printing production practice have accumulated rich experience for colorful. Li Peng, manager of colorful Technology Department, shared his experience on some technical details

1. Process perspective

(1) prepress link

according to manager Li, colorful uses Cleo 800 Series Phototypesetter in stereo printing, with an accuracy of 3600dpi and more than 400 lines/inch. When choosing a Phototypesetter for stereoscopic printing, the grating parameters must be fully considered. Even the Phototypesetter of the same brand has different accuracy, so the same Phototypesetter must be used for the same ~ live parts in different batches. In addition, it is necessary to calibrate regularly against the setter to ensure high-precision image effect

when making stereoscopic image films, if the accuracy of the Phototypesetter is set to an integral multiple of the image resolution, the occurrence of periodic fringes can be reduced to a certain extent. Since the grating is composed of regular fringes, in order to avoid collision, frequency modulation plus is often used. If amplitude modulation plus is used, the line angle should not be set to 0 when making film. And 9oo. When outputting the film, the side of the film is facing up, which can avoid the artificial spelling error caused by manual spelling and printing

(2) printing link

with the continuous maturity of UV offset printing technology, many equipment manufacturers have launched UV offset printing equipment. For stereo printing, such as Heidelberg, Manroland, gaobao and Komori, the application of UV offset printing machine can realize direct printing on the back of grating. Colorful currently adopts Komori l-528+c+uv printing machine, which directly prints on grating materials. The paper size is 200mm x 280mm to 720mm x520mm, and the maximum printing area is 71omm × 51ommm, the thickness range of printing materials is 0.04 ~ 0.60mm, and the printing speed is 15500 sheets/hour. During raster printing, the speed of the printer is generally limited to 7000 sheets/hour. The UV curing system of the equipment is the key link of printing control. Different types of inks have different curing characteristics. In order to fully cure UV inks, it is necessary to select the matching UV light source. The commonly used UV light sources include high-pressure mercury lamp, metal halogen lamp, etc. the lamp tube cooling methods include ventilation cooling and water cooling. When selecting UV light source, it is necessary to select UV light source according to UV ink and 3 The pressure reducing valve in the pneumatic 3-piece is set at the convenient operation position, which depends on the curing conditions of UV light oil. It is also necessary to compare the irradiation efficiency of UV lamp. Due to the short service life of UV lamp, it is generally about 1000 hours. Therefore, pay attention to replacing new lamp tubes in time in production

we know that. 30% of the UV light absorbed by the ink during curing comes from the direct light of the light source. 7O% comes from the reflection of the reflector. At present, aluminum reflective plates are widely used, but their reflectivity varies greatly. Therefore, when detecting UV light energy with a thickness of more than 100 nm, it is necessary to measure not only the lamp tube, but also all UV light including reflected light. Three dimensional printing needs to use a cold reflection plate to ensure that only ultraviolet rays are reflected and infrared rays are transmitted, so that the surface temperature of the printed matter is reduced by 10. C or so

2. Main consumables

(1) grating material

stereoscopic printing requires high surface strength of grating material. Insufficient surface strength is easy to lead to poor adhesion. Due to the smooth back of grating and low affinity for ink, it is easy to pull off the previous color ink when overprinting the latter color. Therefore, with the implementation of Euro 6 standard, the printing suitability of materials should be tested, and the surface energy of materials should be above 40 dyne. In addition, we should reasonably arrange the color sequence and adjust the relevant process parameters in the printing process to avoid and reduce the occurrence of the above phenomena

(2) ink

because the material of the grating is polymer material, the absorption is poor, and the ordinary ink will not penetrate and dry on the grating material. Therefore, we choose to use UV ink for direct printing. The UV curing principle is used to produce photochemical reaction and instant curing of the ink. However, grating materials of different materials need to match different inks, and factors such as light transmittance, curing rate and concealment of inks should be comprehensively considered. When printing pet gratings, the relevant institutions use Gao's rap series ink, which has a very good printability

(3) plate material

except for the positive PS plate for UV ink, if other positive PS plates have not been baked, the printing resistance is low, so it needs to be baked (the baking condition is 250. 6-8 minutes at C). For negative PS version, we should also try to choose high printing resistance plate

(4) fountain solution

because there is no special fountain solution for UV ink printing, excessive Arabic gum should be avoided to be added to the fountain solution, because Arabic gum will react with UV ink, causing ink stacking, rubber blanket stacking and other failures. Using alcohol fountain system can reduce the surface tension of ink and promote the curing effect. In addition, during the printing process, the blank part of the printing plate can be strengthened with the fountain solution to ensure that the lipophilic area is fully ink friendly and the hydrophilic area is not inked

3. Personnel

because stereoscopic printing is not very common in China, especially in the north, and there are few technicians and equipment operators for stereoscopic printing, enterprises need to invest considerable human, material and financial resources in the training of operators. If personnel cannot keep up, stereoscopic printing process control will become a production bottleneck

quality evaluation standard

stereoscopic printing is different from ordinary printing. It has its own set of evaluation standards. Manager Li introduced in detail the colorful subjective evaluation methods from the perspectives of designers and printers, that is, from the perspective of stereoscopic clarity, matching degree, brightness and so on

1. Stereoscopic sense

the foreground and background of stereoscopic images will inevitably produce ghosting. On the premise of ensuring the clarity (that is, ghosting is within the allowable range), the maximum stereoscopic depth from the foreground to the background should be felt by the human eye. Here, stereoscopic depth refers to the depth of field of the picture rather than the actual depth of the scene being photographed. The evaluation of stereoscopic sense is based on the stereoscopic depth sensed by the human eye. The greater the depth sensed, the better the stereoscopic sense

2. Sharpness

sharpness is related to the resolution of grating image and the properties of grating (grid distance, width, light transmittance). Within a specific observation distance, a stereoscopic image that cannot distinguish between grating lines and image pixels. The higher the definition, the better the image quality

3. Matching degree

the matching degree of grating plate and grating image affects the quality of stereo pictures. Poorly matched pictures will make people feel dizzy

4. Brightness

images with higher brightness look more comfortable. The quality of the image is better. Too dark images will affect the viewing effect, and the quality of the image is also worse. Due to the function of the grating plate, the brightness of the stereo image will be reduced, which affects the viewing effect of the image. The use of grating plates with high transmittance can reduce the brightness loss of printed matter. At the same time, when making raster images, the brightness of the images can be adjusted and improved appropriately to compensate for the brightness loss

stereoscopic printing helps enterprises take off

in just two years, colorful has successively cooperated with Motorola, BMW, Audi, Canon, Sony and other international brand companies. The enterprise brand and popularity are constantly improving. In 2005, colorful was recognized as China's stereoscopic printing research and promotion base by the National Printing Technology Standardization Committee. It jointly participated in the formulation of stereoscopic printing industry standards and the development of technology. It also participated in the stereoscopic printing project of the national banknote printing and coinage Corporation to commemorate the development of anti-counterfeiting printing technology, and took this opportunity to join the China anti counterfeiting technology association, It took the lead in the industry to pass the jcti International Toy Association certification at one time, becoming a rising star of domestic stereoscopic printing at one stroke, and obtaining a green pass for exploring the international market

although colorful is famous in the domestic market for stereoscopic printing, at this stage, stereoscopic printing is not the main source of profit for colorful, but plays a propaganda effect on improving the popularity of enterprises and expanding the printing market. The colorful experience is that while enterprises pursue profit maximization, it is not the best policy to simply fight price war and keep production in the pure processing stage. Brand effect, high-quality services and diversified products can more effectively improve the comprehensive competitiveness of enterprises

information source: Printing Technology

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