The latest trends in the field of printing surface

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The latest trend in the field of printing surface processing

the changes of the times promote the continuous renewal of people's values; Seeking differentiation and creating added value has become a growing concern of all media, including printing

for the printing field, due to the increase of short version, small batch and personalized moving parts, the Postpress processing technology has been renovated, and the wave of on-demand processing as the corresponding after-demand printing process came into being. In order to cope with the increasingly complex media environment and the diversification of consumer values, new materials and technologies are constantly introduced in the field of special printing and special processing that can create added value

it has become a general trend to pursue products with unique functions and signs. Therefore, special processing is no longer an independent post-processing, but an organic combination with the printing process. For example, the original gloss and foil pressing are typical post-processing operations, but now we can often see prints printed after foil pressing or silk printing after lamination. Many samples of packaging products were collected at drupa exhibition in 2004, and several kinds of printing materials with high added value were eye-catching, such as silk printing or embossing processing, foil pressing processing after gloss processing of polypropylene, etc. In Japan, we can often see silk printing and embossing processing combination, embossing printing and gloss processing combination and other prints. The following mainly introduces gloss processing and foil pressing processing

I. gloss processing

gloss processing technology is roughly divided into gloss coating, UV glazing, machine press coating and lamination. In addition, there are new gloss processing methods, such as applying heat curable resin on the surface of printed matter, pressing it together with the film with good transmittance, UV lamination of film layer transfer printing with the help of UV irradiation, or polypropylene lamination of embossing process design by heating roller to press it onto the surface of printed matter, which have been widely used

uv laminated resin coated cloth is extremely small. These two materials have two shortcomings: 1. The price is high, but they can also obtain a mirror like gloss effect. Polypropylene mounting designed by embossing process can also make ordinary paper obtain various embossing effects. Embossing paper or plain embossing processing, its embossing pattern will affect the back of the printed matter, but this method can make the back of the printed matter smooth. These methods have been applied to stationery products such as mouse, pad, magnetic paper and measuring ruler, as well as DM fields such as triangle lottery and confidential mail. In terms of environmental protection, many regions have taken strict control measures in the field of surface processing. Surface processing has shown a trend from lamination to coating. In fact, acrylic resin has been the mainstream of coating and lamination equipment. PVC resin has been used before, and chlorine containing equipment is almost no longer used at present, mainly to control the use of harmful substances such as dioxane. The processing agent for coating and lamination has changed from solvent-based to solvent-free (acrylic acid). This is also to control VOC (volatile organic compounds) emissions

II. How far are the concepts of foil pressing

from us? Integrating the concept of "one cut" into "one start", foil pressing processing is also changing year by year. In the past, foil pressing processing was a processing process before binding. At present, it can be combined with silk printing to show special effects. Compared with the printing process of aluminum evaporated paper (silver paper) and holographic drawings, a method of foil pressing before printing is developed

this method has two advantages: first, unlike the silver paper hologram, the foil is only used for the parts that need gloss, and there is no need for blank printing; The second is to obtain spot color or layered metallic luster after printing on the foil

the mainstream of printing after foil pressing is UV offset printing or UV printing. Foils that can adapt to general offset printing inks have been available. In addition, the processing method combined with the original foil pressing and embossing has been developed, and the safe foil pressing, also known as cold rolled sheet, which achieves the purpose according to the latent image development, has been applied. This process is to carve fine lines when making foil pressing templates, so that different latent images can be seen from different angles. Thus, it can completely replace the high-cost 3D hologram, and this effect can be obtained by combining it with the general prism mode hologram foil

for the processing field of hologram foil, on drupa in 2004, Kurz company in Germany launched samples with new hologram changes, and we can see many new technologies. Holograms that use inverted to turn the light and shade, holograms that use 90 degree rotation to turn the light and shade, holograms with concave and convex mirror effects, holograms with subtle words, and holograms that rely on special light to emerge patterns

at present, there are holograms that can be scratched when using prepaid cards. Recently, due to the development of hologram foil for magnetic storage, you can often see the exhibition performances of various card foil presses. In the future, holograms will not only be used for cards, securities, financial bonds, etc., but also will be widely used in application forms, letterhead, supporting documents, etc., which fully meet the mechanical standard brand identification of pipe testing. The processing technology worthy of attention in the future should be related to labels and seals. Machines equipped with cold foil transfer devices in narrow web flexographic presses have been introduced. Although it is still in the experimental stage in Japan, at the 2004 drupa exhibition, several companies, such as British focus company, Spanish IMER company and Italian GIDUE company, officially exhibited the label printing machine that carries out online processing of cold focus. It can be said that all label printing machines in Europe are equipped with foil pressing devices

source: printed in China

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