Detailed explanation of the hottest special printi

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With the development of packaging and printing industry, the domestic market has an increasing demand for special paper. Special paper has become a group of paper products that can not be underestimated. Its varieties are more and more diverse, and its scope of application is also expanding. In order to let readers have a little understanding of this variety, the following specially introduces the relevant characteristics of some special paper and its relationship with printing design

since the invention of papermaking, paper, as a material with cultural attributes, has been expanding its scope of application and has been endowed with more connotations. As for the classification of paper, the art paper (also known as fancy paper and special paper) we mentioned here mainly refers to the paper different from ordinary printing paper, such as coated paper, offset paper, paper culture and packaging paper. This kind of paper usually requires special paper processing equipment and technology, and the processed finished paper has rich colors and unique lines. Art paper can be used in exquisite book covers, picture albums, brochures, invitations, greeting cards, high-end office paper, business cards, high-end packaging paper, etc. At present, with the rapid development of domestic economy, people's aesthetic requirements are also constantly improving. The demand for displaying images and communicating information through paper is growing day by day, and the art paper industry has also developed rapidly. Since entering China in the early 1990s, art paper has attracted many people in the design and printing circles with its unique charm, and the use of art paper has also increased dramatically, The number of people engaged in art paper sales is also growing rapidly. Take Singapore Xiemao Paper Co., Ltd. as an example. It entered China at the end of 1993. So far, it has developed from a company at that time to a large art paper sales company with four wholly-owned companies and nearly 30 distributors and liaison agencies in China

I. classification from different angles

1 From the perspective of pulp. Special paper pulp requires high quality, mostly pure wood pulp, with more long fibers, and some contain cotton. This kind of paper pulp has good strength and toughness, good stiffness and elasticity, and bright color. The pulp of ordinary paper is equipped with a certain proportion of non wood fibers. The paper is easy to turn yellow and generally needs to be coated

2. From the perspective of dyeing, it can be divided into pulp dyeing and post dyeing: pulp dyeing is to add toner when papermaking is finished, so that the color is evenly distributed in the paper fiber, the color of the paper is saturated and uniform, and the cross section is the same inside and outside. Post dyeing is to dye the pigment on the surface of the paper by soaking after the paper is formed. The color stability is inferior to that of pulp dyeing. It is easy to decolorize when encountering water. When folding dark paper, it is easy to have white edges, which destroys the overall effect

3. From the perspective of embossing methods, it can be divided into pre embossing and post embossing: pre embossing refers to the process of passing through a soft felt when the pulp is not completely dehydrated, so that the paper fibers are distributed according to the natural lines of the felt to form a special texture of the paper. The texture of the pre embossed paper is natural and delicate, and will not damage the paper fiber. After embossing 2. The performance characteristics of the electrode tensile testing machine is that the finished paper passes through the carved steel roller and uses mechanical pressure to make the paper produce patterns. The advantages of post embossing are simple process, relatively low cost and easy operation. However, this process is harmful to paper fibers, so the quality of base paper directly affects the quality of finished paper after embossing. The rear embossing pattern has little change, and it is slightly mechanical and rigid compared with the front embossing pattern$ Page break $

selection of art paper

art paper is mostly imported, and it is basically priced by piece, which is relatively expensive compared with ordinary printing paper. Therefore, in addition to having a certain understanding of the key points of its use in prepress, printing and post press, we should also pay attention to the following aspects

1. Understand that full paper size

art paper is usually not a generous and positive specification, and different art paper has different specifications, so it should be clear when purchasing and ordering. Consider and measure carefully when calculating the number or size, and make the most of the paper area. In order to reduce costs, abnormal opening (mixed opening) or overlapping can be considered to avoid unnecessary waste

2. Distinguish front and back

art paper is mostly used for single-sided printing, so it is very necessary to distinguish its front and back. The front and back sides of some art paper are easy to identify, but there are also some front and back sides that are very similar, so it is necessary to mark the outer package when feeding paper, so as to avoid being unable to identify the front and back sides due to the wrong direction during handling

3. Understand the inventory

the inventory here refers to the domestic inventory, which is the amount of paper that can be directly accessed. When ordering paper, be sure to specify the date and place of delivery, and further check if necessary, so as to receive and inspect smoothly

4. Clear pattern

many art papers are very similar in appearance, but there are great differences in printability. Therefore, when the customer brings the paper sample, be sure to ask the agent, number, weight and other information of the paper sample as much as possible, so as to order the paper. Otherwise, it is likely that such paper will not be found for several days and nights, which will affect the printing progress

5. The price of art paper is high, so it is particularly important to keep it properly. Generally, the temperature and humidity in the workshop need to be controlled all year round to avoid paper deformation. In addition, we should ensure the integrity of the outer packaging of art paper, and try not to open it before printing. The PCB industry has been built into a PCB industry with the most complete product varieties, the most complete industrial chain and the earliest comprehensive technical level in the PCB field in China, which has been unsealed for a long time

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design points of art paper

the characteristics of art paper determine that in the field of packaging and printing, it does not reproduce the value of products based on printed graphics and text, but makes full use of its own unique colors and lines, and then makes appropriate design. The unique gloss and color differences of art paper will bring people different feelings. When these different paper personalities are combined with design, designers need to be ingenious and use the personality of art paper to convey the design intention, so that the personality of paper can become a part of the design and be perfectly unified with the design style, so as to show the unique artistic effect. In prepress design, we should pay attention to the following points

1. Choose the appropriate art paper according to the characteristics of the product

when designing, we should make full use of the emotions and emotions expressed by the original lines and colors of art paper, and achieve a concise and beautiful artistic effect through the simple design that makes the finishing point. Therefore, sometimes it is not necessary to reproduce the effect of products with a large area of printed graphics and texts, which can also save printing costs and reduce costs. For example, choose brightly colored art paper, and match it with appropriate ink according to the characteristics of the product, so that the ink color can form a strong contrast with the paper color, so as to attract the attention of customers. Of course, you can also choose some art paper with high transparency, and use its translucency to make reasonable design, so that the artistic sense of the product can be strengthened

2. Understand the thread property of art paper, and consider the stiffness required for the outer packaging of products

effective use of the characteristics of art paper with good strength, toughness, stiffness and elasticity can increase the appearance stiffness of packaged products and improve the grade of products. In the design of cartons, it is often necessary to mount ordinary paper and art paper. At this time, we should pay attention to the thread direction of the paper. The usual practice is to make the strands of ordinary paper and art paper as the lining perpendicular to each other to increase the stiffness of the carton

3. Use special post press processing technology

mainly use embossing, UV glazing, hot stamping and other processes. Due to the high content of long fibers in art paper, it has good stiffness and toughness, and is usually thick. It is suitable for pressing concave convex processing to improve the artistic effect and grade of products. Many art papers have rich textures and special textures, which can be used to make a sharp contrast with the gloss produced by UV glazing, so as to achieve special artistic effects

4. Selection of printing method

if the product is required to be bright in color and thick in ink layer, silk printing should be considered. But if you want to get a clear feeling, you should consider using offset printing. The choice of printing method will have an important impact on the final effect of products

5. Selection of printing ink

in order to pursue gorgeous appearance, many customers will consider using silver ink and gold ink printing, but in the design process, the layout should be designed reasonably according to the characteristics of art paper and printing process, which should not only be beautiful and generous, but also be full. 3. The sliding surface between the inlaid steel plate and the lining plate and the dovetail groove surface on the lining plate should be clean. Considering the characteristics of gold and silver ink and the requirements of printing process, Try to avoid printing failures that should not occur. Generally speaking, gold and silver inks are mainly used on the field parts or color patches, while it is best not to design gold or silver for very small Yin Wen, Yang Wen and level transition. In the process of plate making design, the color sequence arrangement of gold and silver ink should be considered to ensure the metal color. We should also consider the requirements of gold silver ink printing on art paper. If art paper has a strong absorption of ink, the binder will be absorbed quickly, and the metal pigment in the ink will float on the surface of art paper, lose luster, attach loosely, and even fall off. However, art paper with strong acidity is easy to react with metal powder, causing metal pigments to change color and lose luster. When printing gold and silver ink on art paper, the bottom color ink is usually paved first. For example, when printing silver ink, a layer of light white ink is paved first, which can not only improve the gloss of the silver ink layer, but also strengthen the adhesion of silver ink on the paper. After printing gold and silver ink, some products should also consider UV glazing or water-based glazing, or film coating, to prevent oxidation, discoloration or falling off of metal pigments

The particularity of papermaking process makes art paper have many particularity in paper structure and performance, which leads to many particularity in printing process

1. Ink absorption

various art papers have a wide range of ink absorption, such as: coaster paper is very easy to absorb ink, Lenny paper is easier to absorb ink, and transparent paper is difficult to absorb ink. The ink absorption of art paper is directly related to the quality of prints and the required delivery time. For the paper with poor ink absorption, you can appropriately add driers to the ink or use UV curing to avoid the back sticking and powdering due to the slow drying of the ink. Of course, the structure of paper has a great impact on ink absorption. Some papers are relatively loose and thick, and ink can easily penetrate and dry; And some are very tight texture, ink floating on the surface of the paper, so it is not easy to penetrate the paper, and it is not easy to dry. Art paper with different ink absorption can usually be controlled by adjusting the printing pressure and treating the ink. If necessary, a certain amount of trial printing can be carried out first (the amount depends on the need)

2. Smoothness

due to different papermaking processes, some art papers are relatively loose and thick, with low smoothness; We will try our best to make some paper more compact and smooth. Among art paper, there are also papers with relief effect (such as relief paper) and strip texture effect (such as bamboo paper). When encountering this kind of paper, it is generally recommended to print less or even no, and use the natural floating lines of the paper to carry out some simple local processing, such as embossing, UV glazing, hot stamping, etc., so as to basically retain the base paper

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