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In-mold label printing processing, click to enter the Chinese version

In-mold labels (In Mould Labelling, abbreviated as IML), the process is in the container production process, the printed image as a self-adhesive graphic or trademark material directly into the plastic mold inside the mold area, so that the bottle label and containers fused together to form a complete container production process. In-mold label all of these processing operations in only one process to complete. In-mold labeling of plastic packaging container manufacturing industry, the fastest growing and most effective labeling methods for the plastic container / bottle label manufacturers and other commodities produced in the label design to create a new methods and ideas. Adhesive labels (stickers) can be more perfect performance of a variety of fine label requirements, in-mold label relative to the cost of printed shrink film label to be higher. Main applications are self-adhesive labels, special labels. Shrink Label Printing with shrink film (mainly PVC film, PET film, PP film) as the packaging of the product label, the relative self-adhesive labels and screen printing labels directly lower the cost, but the shrink label printing easily damaged, the overall image is not good, nor environmentally friendly. Screen printing is the production of labels and text patterns using screen printing to print on the packaging container, the overall effect is good, graphics and text has texture, but the quality of direct screen printing is not ideal, it is difficult to fine reflected patterns and small text, and if the colors are more colorful label, with the high cost of direct screen printing, but also a bit difficult, not very good printed results. In fact, the advantage lies not only in label printing product range continues to increase, more importantly, to achieve high-speed labeling of automation and constantly upgrade. Traditional label printing technology, the traditional lack of label printing with the development of the times, businesses of their own products, packaging and labeling requirements are increasing. High quality, high information content, new, security, environmental protection labels are being understanding and needs of Chinese enterprises. On the one hand, a variety of products or to improve the quality of goods while the goods pass the information on the product label requires more beautiful. Very rich in commodities today, the consumer goods concern each time is very short, in order to stand out in the range of goods is not easy, and only rely on packaging and labeling as to attract the attention of consumers, consumer acceptance and purchase order to be . On the other hand, users of the label requirements of improved function and form, such as requiring intelligence and security labels have sex, no longer limited to a certain size range, and some even up to 100mm x 500mm; some do not label the inner double-sided adhesive, while the use of adhesive bonding, reducing the cost of production; used in the service sector and increased demand for logistics management of labels, such as air bags, books, labels, single highway toll collection, etc., and the need for both security functions. At present, the impact of digital printing technology in various parts of the printing, label printing market, the traditional shortcomings are gradually exposed: (1) the label on the market (especially film class labels) to use more screen printing and flexographic printing, not only processing complex, a longer period, but time poor. (2) in product design, design of filters to go through repeated sampling, modification, not only cumbersome, and costly. (3) traditional printing methods to achieve variable data printing, digital code. Identification bar code and other security printing, printing through two or even three times to achieve, cumbersome than digital printing. (4) can not handle less than 2000 copies printed short version of the live, as some promotional items or test market product label or packaging, making the printing companies to undertake these operations not only not profitable, but also at a loss. (5) customers are increasingly demanding high print quality, print volume is getting smaller and smaller, traditional label printing market competitiveness continues to decline. (D) of the digital label printing digital label printing technology can easily color text and graphics printing and variable data printing, to meet the changing needs of the market, more importantly, can bring benefits. Mainly in the following aspects. 1. Changed the traditional printing of passive subordination to achieve a balance between length version, expanding the company's business scope, can provide customers with a cost-effective solutions from India; personalized printing, variable data printing segments of products to meet the user's demand; security printing features to provide a more secure product. To HPIndigo, for example, printing an A3 format printing, paper, ink and other consumables costs around $ 0.90, if the graphics area of ??30.8cmx43.7cm, per square centimeter four-color printing consumables cost of .000669 element, color is less than 0.000167 Kang, and how much how much India will not cause waste. Since all digital production, the entire process only one operation, maintenance costs are lower. 2. Improve production efficiency now, many digital presses can make label printing, printing speed, format, variable data output of its ability to meet the highly automated, large-scale intensive production needs, to ensure seamless product; reduce the plate, drying version. Clean blankets, and other procedures, saving time and material costs. 3. Accuracy can be improved label printing resolution is 2400dpi. 230 lines / inch high-precision image printing; the use of special inks to improve product aesthetics, but also to improve the product's security features. To design personalized labels and text to give a wealth of content. 4. Spot color digital label printing to achieve up to seven-color printing presses, especially suitable for spot colors and special color label printing requirements such as security companies or spot color spot color. 5. Achieve product tracking and counting. Digital label printing can be done for each A4 labels are not the same as the content, or even every small labels are not the same, such as serial number, the variable data portion of the UV and watermark can be handled in different ways and so on. Improve the aesthetics of the label at the same time, also achieved the product tracking. Identification, security, counting and many other features. 6. Wide range of digital label printing label materials are widely available materials such as paper, ABS, PET, PC, PVC, PP, PE, EVOH, aluminized, gold and silver cardboard, adhesive materials, composite films. 7. Product anti-counterfeiting features strong college-color printing, microfilm text printing, UV printing inks. Monochrome or color personalized variable information printing, watermarks, bar code printing, three-dimensional image printing and any combination of the above methods can be achieved by digital printing. 8. Adaptability to the production environment the overall design of digital label printing technology to ensure a variety of industrial environments can run freely. (E) in-mold label printing in-mold label with PP or PE synthetic paper in the surface treatment, the back of the hot melt adhesive is coated with a special process to become a special label paper, print production as a trademark. Using the robot pick up the printed label has been placed in the mold, the mold on the label firmly adsorbed to the vacuum holes in the mold. When the heating of raw materials and plastic bottles into a hose-like sag, quickly close the mold with a label, the air blown into the hose, so close to the mold wall, then the temperature of the mold is still relatively high, close to the bottle shape solid-like adhesive labels, and agents began to melt in the mold and plastic bottles within the combination together. So when the mold is opened again, the plastic bottle shape, label and bottle together as one. The fine print mark firmly embedded in the surface of plastic products, labels and plastic bottles on the same surface, I feel there is no label, color graphics printed directly on the bottle surface as the surface. In-mold labels can be used for blow molding, injection molding and other thermoforming container labeling, good performance, making it a great potential for development of the packaging. Different printing equipment manufacturers according to their situation to use a different printing process and finishing process to produce in-mold labels. In-mold labeling is now widely used in plastic film substrate, suitable for a variety of printing inks with different processing methods, including: screen printing, UV letterpress printing, flexographic printing, gravure and offset printing. Before the ink in the selection should be based on the final application requirements, in-mold labels for ink adhesion on materials, scratch resistance, chemical resistance and other performance tests. There are two printing-mold label processing methods: web and sheet-fed printing process printing process. 1. Web printing processing: processing and extension into a multiple-line processing. Both processing methods with their own equipment and plant design requirements for labeling. If the print processing pattern with gilt label, and press on the rotary hot stamping and die-cutting device, the label can be a molding process; if only a single stamping machine and cutting machine, the label can only be processed several times to complete. Characterized by the production speed, high efficiency, but because of the high cost of manufacturing roller, more suitable for mass production. 2. Sheet-fed printing process: usually peaceful version of the offset printing. This approach is multi-process multiple devices on the completion of the printing process and process design, process more flexible than the roll plate method with low cost, suitable for small batch production; effective printing, screen printing and offset the ground level effective than the printed roll printing. In-mold label printing needs: 1. Material mold label technology-intensive, the first material is reflected. First to enter the Chinese market is Japan YUPO mold labels, known as the world's most successful mold label material. Now, France Polyart (Puli Ya) blow-mold standard is also entered the Chinese market, there are some local companies are also stepping up research and development of this material. In-mold labels must first have good printability, ink firmly attached to ensure the surface, in the post-processing to ensure good processing with adaptive, such as cutting and cold stamping process adaptive. Second, the use of this material to meet the characteristics of the blow molding with the plastic bottle into one. In-mold label material is divided into two major categories of paper and plastic film. The former water or moisture will be deformed, lower value, but its advantage is not static interference, reducing the loss of blowing when drawing the label, while it is not a homogeneous material with plastic bottles, not easy to recycle. Now, at home and abroad commonly used type of plastic-mold label film material. In-mold label material structure from the printing surface, the middle layer and adhesive layer. The role is to accept the printing ink surface, the formation of color graphics; the middle layer to support the printing surface, to give sufficient material stiffness andtransparency, and in the press under high temperature deformation, ensure overprint precision. Adhesive layer in the melt under high temperature, label materials and plastic containers to become one, to ensure tags and plastic bottles firmly stick together. Printing surface materials are generally three types: PE, BOPP and PE + PP. As most of the plastic containers are made of PE, so the use of PE-mold labeling is more conducive to recycling, because they all belong to homogeneous materials. In-mold label production, in order to improve the pro-printed ink surface materials, surface coating or coating generally requires the corona discharge method to improve the surface energy. Adhesive layer of the surface, there are two structures: the structure and textured surface without reticulate structure. The former used directly in contact with rough, natural exhaust, suitable for small area label. The latter on the surface imprint of the textured structure, use the exhaust gas through the textured channel exhaust to avoid the production of bubbles. Adhesive layer also has anti-static, to prevent double sheet printing; In addition, it has a sliding, to ensure a smooth separation of the label, making the printing process smoothly. 2 different mold label printing printing equipment manufacturers according to their condition, choose a different printing process. Offset, flexo, letterpress and gravure printing-mold labels can be present in order to offset and flexo majority. (1) offset in the fine print the benefits of the network is very prominent, but the lines, on-site printing and printing saturation effect smaller than other printing methods. Did not achieve as flexo offset connection (Inline) printing process, so the need for off-line after printing (Offline) die-cutting, perm, polishing and other processes. However, small quantities of labels for offset printing, short, flexible. Offset printing in small network quality is superior to other printing methods, is the short version of the business to offset the cost of production is lower than other printing methods. In line, the field effect and color printing on the degree of saturation is less than other printing methods. Offset in color on the difficulty of control than other printing methods. (2) gravure printing and spot color saturation than offset printing, printing is not suitable for small offices and multi-layer trademarks. But the color control more convenient. In gravure printing machine, in-mold label material paper path is longer than other printing methods, so the larger the chance of static. Gravure plate-making costs are high, long cycle, so the long version of the mold for label printing. Gravure printing method and printing results in the field of color saturation better than offset, in a small network of rich level of print quality and image printing extent than other, better than in the control of color offset printing, letterpress printing. The paper path as gravure printing than the other way longer than other printing more prone to static electricity. Gravure printing plate production for a long time, high cost, therefore, the short Banmo label printing business is not within the appropriate way of using gravure printing. (3) letterpress printing field for mark and lines, printing small outlets are not effective, a number of products with the color control is relatively easy, but there will be Mexican bars. From a cost perspective, is cheaper than the gravure and flexo. Letterpress printing in the printing quality of a small network is worse than other printing methods, printed version of the anti-Indian forces below the gravure and flexo, color control than in offset printing easy, but the effect was not as good as gravure and flexo printing is good, and likely to have Mexican bars, costs and cycle less than the gravure plate and flexo printing. (4) flexographic flexo printing and the outstanding advantage of after-processing technology can go, the front is the feed side, the back-end to obtain the final printing on finished products, printing and post-processing to achieve a connection to production. Now, with improvements in flexo plate making technology, network printing quality has been great progress, in-mold labels are printed on a number of manufacturers have been recognized, but the use of environmentally friendly water-based ink printing is not mature, experienced manufacturers is the use of good UV ink flow, but also a trend-mold label printing. Flexo printing is a way of packaging and printing the mainstream in Europe and America, with CDI flexographic printing plate technology to get better print quality and network print saturated colors. (5) screen printing screen printing printing-mold label printed directly on the bottle up as the economy. 3, in-mold label printing process is the key to using ink printing available though a variety of different types of ink used to print in-mold labels, UV ink label in the mold surface adhesion and good drying properties it is undoubtedly various types of printing processes and choice. UV offset ink-water balance is the process by high-quality printing of labels and the key to high yields, and other printing process uses UV ink is the key to selection of high color strength and good leveling properties of both the UV ink. Therefore, in large print thick, in the appropriate color ink on the appropriate amount of antistatic agent electrostatic printing process results will be trimmed some help. 4, in-mold label of glazing to reduce mold labeling label failure, if you use vacuum-mold labeling method, the coating should be appropriate to add antistatic agent and varnished smoothness degree of regulation; mold using electrostatic adsorption label method, you should not add the coating antistatic agent. If the in-mold label after printing needs bronzing, bronzing UV varnish should be used can be hot, if the varnish additive is added to test each batch of coating should be preceded, in order to avoid the entire batch of product obsolescence situation. 5, the die-mold label printing for roll-off semi-finished sheets if taken after cutting the way, there will be more off the sheet when the needle moving phenomenon, directly affect the movement of the needle place the entire production process efficiency and final yield. Zhang moved off the clock to resolve the method a bit: to maintain the stability of tension, in a timely manner to eliminate the accumulated error of broken sheets; Method Two: trapezoidal plate when making a good bit line of the needle, then pick a different pin-out line classification. (1), in-mold labels can be used off-line CNC automatic die cutting machine, die machine semi-automatic trademark, semi-automatic die-cutting machine to shape. (2) connection to die-mold labels: in-mold labels manufacturers use die-cutting line flexographic printing press when the subject prone to the phenomenon of chaos, produced mainly by the underlying disorder labels and tags with static electricity caused by the transfer is not smooth. So when there is chaos when the finished product labeled collected to pay attention to check whether there is marked down, the anti-subject phenomenon. 6, in-mold label stamping process in-mold label material can be used above the tipping over after the first hot oil, or oil after the first had a different hot stamping process. Stamping can be used cold hot, scalding two ways. Affect the hot stamping effect of the main factors are: the foil, hot stamping temperature, stamping pressure, stamping speed. First in-mold labels hot stamping foil material properties and adaptive basis, according to the size and gilt gilt version to determine the speed of the temperature and gilt stamping pressure, adjust the pressure, temperature determined gilt. Cold stamping mainly for flexographic printing, the use of cold stamping to get better visual effect requires high technology, the manufacturers generally recommend the first post-cold-hot printing process, covered with thick layers of ink to the edge of the cold stamping burr. 7, static elimination mold label material with good electrical insulation, take the paper in the printing process of the static friction is difficult to eliminate through its own transmission. Electrostatic effects on the in-mold labels are: (1), easily absorbed in the air of dust, resulting in the printing appear dirty spots, pinholes, graphics are burr, thus affecting the appearance of the label; (2), with a static model strong absorption within the label, easy to increase the printing, die cutting processing difficulty, and there re-labeling phenomenon Zhang; eliminate static mold label the main measures: (1), try not to use when printing corona processor; (2) , varnish, ink on a large field to add antistatic agents; (3), the installation of static eliminator; (4), work shop and humidity control in about 60%; above is a common mold label printing process technology brief , the profile related to the UV offset printing process, flexo printing technology, UV ink printability, non-absorbent material on the stamping process, cold stamping (cold transfer) technology, NC; in the model are currently not widely used in China, However, the use of these emerging technology, a combination of mold label to expand the production process, to enhance the trademarks of security features, is the in-mold label production process development.

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