Application of the hottest aluminized paper in lab

2022-10-23
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Application of aluminized paper in label making

label is a special printed matter used to express the name and attribute of goods, and it is also one of the important means to publicize and promote goods. Statistics show that about 70% of retail sales are determined by consumers' temporary impulse, so exquisite and eye-catching commodity labels have played a certain role in promoting. With the continuous development of label technology, label users have higher and higher requirements for the printing quality, security and anti-counterfeiting performance of labels in addition to the requirements for the adhesion, durability and appearance of labels. Because aluminized paper has many advantages, such as beauty, high-grade, environmental protection and easy laser holographic anti-counterfeiting processing, it has been widely used in the fields of paper labels and self-adhesive labels of beer, soft drinks, alcohol, cans and so on. For example, aluminized paper beer bottle labels have been adopted all over the world

production process of aluminized paper

aluminized paper is composed of base paper, aluminum layer and coating. At present, there are two main production methods, one is direct aluminizing method, the other is transfer aluminizing method. 1. Direct aluminizing method

the production process of direct aluminizing method is to coat the bottom layer on the base paper first; Then the surface vacuum aluminum plating is carried out on the vacuum evaporation machine; Finally, the protective layer or color layer is coated on the coater, and the finished vacuum aluminized paper can be made after humidification. According to the needs, embossing and other surface finishing treatments can also be carried out. 2. Transfer aluminizing method

transfer aluminizing method is to first coat the stripping layer and bonding layer on the pet (polyester) film substrate with a thickness of about 0.02mm; Then put it into the vacuum evaporation machine to coat the aluminum on the surface of the coating; Then, the aluminized film is glued to the base paper through the adhesive, but not the main combination, so that the aluminized layer is separated from the substrate pet and transferred to the paper surface to make the finished gold and silver cardboard

compared with the direct aluminum plating method, the transfer aluminum plating method has its obvious characteristics: first, it can make full use of the flatness and brightness of PET film to make the metal luster of the paper more bright; Second, it is not restricted by the thickness of base paper and is suitable for paper and paperboard of 80-350g/m2; Third, the pet substrate can be used repeatedly, and the cost is relatively reduced; Fourth, the transfer aluminized paper is easy to degrade, which is more conducive to environmental protection. Characteristics of aluminized paper aluminized paper and traditional aluminum foil paper have common characteristics, such as the color of the paper is glossy, and some workpieces on the transmission system are bright. In addition to the strong sense of metal, elegant and beautiful prints, aluminized paper also has the following distinctive characteristics. 1. In line with environmental protection requirements, the thickness of aluminum foil of traditional aluminum foil composite paper is generally 6-9 μ m. The aluminum layer thickness of aluminized paper, especially transfer aluminized paper, is only 0.02-0.04 μ m. The difference between the two is more than 300 times, and the aluminum resources consumed by aluminized paper are significantly less than that of aluminum foil composite paper. In addition, although aluminum foil paper and aluminized paper are almost the same in appearance, barrier, air tightness, moisture resistance, etc., aluminized paper is easy to recycle and can be re pulped for papermaking. Even waste aluminized paper can be oxidized and degraded quickly in the natural environment. Therefore, aluminized paper is a product that meets the requirements of environmental protection

2. Strong anti-counterfeiting function. The production process of transfer aluminizing method is relatively complex, with high scientific and technological content, and the equipment investment is large, which is generally difficult to copy, which makes the transfer aluminized paper become an efficient anti-counterfeiting packaging material. In addition, the emergence of laser molded anti-counterfeiting aluminized paperboard (referred to as laser paper), an upgraded product of aluminized paper, has further improved the anti-counterfeiting function of aluminized paper

laser aluminized paper is made by loading laser holographic anti-counterfeiting patterns or text signals onto the surface of aluminized paper by molding. The anti-counterfeiting effect is very obvious. For example, when used for brand trademark printing, specific anti-counterfeiting information can be loaded onto the surface of aluminized layer, so that counterfeiters cannot copy

3. Material economy and low cost

because the aluminum layer of aluminized paper is thin, but its strength is high. For example, the strength of 237g/m2 or 232g/m2 vacuum aluminized paper is equivalent to that of 250G/m2 aluminum foil composite material, which indicates that it is more economical to use vacuum aluminized material

4. fast printing speed. The offset printing speed of aluminum foil composite paperboard is usually 5000-6000 sheets/hour, while the offset printing speed of aluminized paper can reach 8000-10000 sheets/hour. In addition, the surface strength of aluminized paper is high, which can adapt to high-speed printing machines. At the same time, it can also withstand the tension caused by the increase of ink viscosity, and has good adaptability to improve production efficiency and stabilize printing quality

5. Wide range of printability

aluminized paper has excellent printing performance and machining performance. It can adapt to gravure printing, offset printing, flexographic printing and printing, as well as embossing, die cutting, and even embossing. Various printing technologies can be well displayed on its surface

application of aluminized paper in labels

aluminized paper has been widely used as a new environmental protection material in developed countries for the packaging of a variety of products, such as cigarette bags, wine bags, cosmetics, food and other packaging, as well as laser anti-counterfeiting marks. Labels, signs and other products

cigarette packs and laser anti-counterfeiting labels are widely used in China. In commodity labels, aluminized paper products mainly include the following kinds

1. Aluminized paper for high wet strength beer label

this is a kind of aluminized wine label paper made by direct method with imported waterproof coated paper as the base paper, and the quantitative content is generally between 70-77g/m2. Wine label paper has high water resistance and mechanical strength, and is not easy to curl. It can be used on high-speed automatic labeling machine. It is mainly used for labels of recyclable glass bottles (including body label, back label and neck label). Aluminized paper for wine labels usually has good printing performance and can be closely connected with the bottle body. The label on the bottle wall can fall off completely in the alkali liquor without tearing, and the label removal performance is very good

in order to give the wine label paper elegant effect, the surface can be treated according to needs, such as pressing special patterns, so that the label shows its special charm. Wine label paper can be divided into ordinary aluminized wine label paper and holographic anti-counterfeiting wine label paper

2. Aluminized paper for labels of alcohol and soft drinks

this kind of aluminized paper is mainly used for labels of non recycled wine, soft drinks and other packages. The corresponding varieties of aluminized paper have good gloss and smoothness, and good printing performance and dimensional stability. 3. Aluminized paper for self-adhesive labels

aluminized paper for self-adhesive labels has good gloss and smoothness, and has good printing performance. It is suitable for die-cutting processing. Self adhesive label aluminized paper is mainly used to make exquisite high-end labels with gloss, such as labels for food, high-grade cosmetics, electrical appliances, drugs, clothes, etc., which makes aluminized paper more widely used in labels

printing requirements of aluminized paper for labels 1. Label design

(1) pattern design

label pattern design can adopt the combination of graphics, color blocks, lines and words, but try to avoid too small and too many color blocks, or too thin and too miscellaneous lines. For complex and small words or patterns that must be included, spot color version should be used. In addition, in order to prevent Yang characters from being broken and Yin characters from being pasted, small fonts can be thickened appropriately

(2) color design

due to the color on the surface of aluminized paper, in order to increase the visual appeal and attraction of the label, the color contrast and saturation should be improved in the design to increase the contrast with the metal color. In addition, multi-color overprint of color blocks should be prevented, and trapping of overprint color should be done in advance to prevent metal color from appearing

(3) wine label design

when designing wine bottle labels, considering that the lines of the printed products should be matched with the automatic packaging production line, the fiber direction of the label paper must be perpendicular to the bottle axis to avoid falling off during labeling

2. Whether offset printing, gravure printing or flexographic direct printing are used on the surface of aluminized paper, there will be some problems in printing adaptability. In order to obtain better printing effect, the ground color (white) should be printed on the surface of the aluminized paper to cover the metal color and increase the adsorption capacity of the substrate surface to the ink

3. printing color sequence

in printing, the color printed first and the color printed later differ greatly due to the different color sequence. Considering the characteristics of aluminized paper such as small absorption and slow drying, the following principles should be followed when printing aluminized paper with multi-color printing machine:

(1) the color with deep color and small area should be printed first

generally, the main tone background color (green, magenta, yellow, transparent color, etc.) with large area should be placed at the end of printing. If you print a large area first, the color printed later will not be overprinted. At the same time, when printing the color behind, it is easy to scratch and rub the surface of the ground color, affecting the appearance and design effect, resulting in the decline of the quality of printed matter. (2) First, the color with high overprint accuracy

aluminized paper has the dual physical properties of metal and paper, so the color with high overprint accuracy should be printed in front to reduce the difficulty of overprint

(3) the hue of post printing main color printing products tends to be biased towards the hue of post printing color. Therefore, in order to highlight the main color of the label image, the main color plate should be placed behind for printing

4. printing ink aluminized paper has smooth surface and poor absorption, so the requirements for ink fixation and dryness are relatively high. In addition, due to the phenomenon of powder and wool falling easily during printing, we should choose bright, fast curing and fast drying special inks with good water resistance, strong friction resistance and high viscosity, or UV inks

5. printing pressure the surface gloss of aluminized paper is high, and the required printing pressure should be smaller than that of paper. However, due to the small absorption of aluminized paper, the ink is difficult to be fixed on its surface. In order to make the ink adhere to the aluminized paper evenly and smoothly, the printing pressure should be adjusted appropriately

6. printing speed

the flatness of aluminized paper is high. If the printing speed is too fast, it will affect the normal transfer of ink. Therefore, when printing aluminized paper, the printing speed should be controlled within 6000 sheets/hour

7. ambient temperature and humidity due to the small absorption of aluminized paper, the drying of ink is slow. In order to speed up the drying speed of ink, the understanding of the concept of environmental protection in the printing workshop is also increasingly novel and reasonable. It should be controlled at 25-280C, and the relative humidity should also be about 60%. If the printing environment is too wet or dry, it will affect the moisture content and flexibility of the aluminized paper, resulting in cracks on the printing surface

the aluminized paper used for the wine label adopts moisture-proof packaging, which can prevent the entry and escape of moisture during transportation and storage, but cannot prevent the change of temperature. When the temperature is different from the ambient temperature, it will lead to paper bending and printing difficulties. Therefore, when the temperature in the aluminized paper package is very different from that in the printing workshop, it should be adjusted to the same temperature before use. With the rapid improvement of the production technology, equipment and product added value of aluminized paper and the emphasis on environmental protection, we believe that aluminized paper will be copyrighted by the original author with its excellent performance and

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