Compared with traditional labels, self-adhesive labels do not need to be glued, pasted, or dipped in water. They are pollution-free, save labeling time, and are convenient and fast for various occasions. Various types of labels with different fabrics, adhesives and backing paper can be applied to materials that are not suitable for general paper labels. It can be said that stickers are a versatile label. The printing of self-adhesive labels is very different from traditional printing. Adhesive labels are usually printed and processed on the label linkage machine, and multiple processes are completed at one time. Volume etc. That is, one end inputs the entire roll of raw materials, and the other end outputs the finished product. The finished product is divided into single or roll labels, and the finished product label can be directly applied to the goods. Therefore, the printing process of self-adhesive labels is more complicated, and the requirements on equipment performance and the quality of printing staff are also higher.
Compared with ordinary paper, film materials have many advantages, and film material printing is the direction of self-adhesive printing in the future. We briefly introduce the structural characteristics of thin film materials, printability and post-press processing technology:
1. Printing process of thin film materials
The basic printing methods are gravure printing: divided into gravure solvent ink printing and gravure printing water-based ink printing; offset printing: UV offset printing ink printing; relief printing: divided into ordinary resin ink printing and UV relief printing ink printing; flexo printing: divided into water-based printing Ink printing, solvent ink printing and UV ink printing; silk screen printing: divided into UV ink printing and solvent ink printing; combination printing: divided into relief printing + silk printing, relief printing + flexo printing, flexo printing + silk printing, offset printing + relief printing Printing method. Here are some more specific printing methods:
A. Ordinary resin ink printing
This is currently the most commonly used method. Due to the drying problem, there are two methods of drying treatment: cutting single sheets and drying on the shelf. This method takes a long time to dry, covers a large area, and is easy to get dirty. Laminating. Wrap the undried ink between the films, pay attention to avoid publishing the film, and prevent the film from failing.
B. UV ink relief printing
This method has good printing quality and high efficiency. It is the most developed printing process in China and most suitable for national conditions. Because domestic embossing equipment generally does not have a UV device, film printing is limited, so equipment renewal and transformation is a necessary condition for printing films.
C. Solvent ink flexo
This is a traditional printing method with good quality. Due to the low surface tension of the solvent ink, the film surface tension requirements are not as strict as other inks, so the ink layer is strong and the process is relatively simple. However, the solvent affects the environment and is harmful to the human body, which is a printing method to be eliminated.
D, water-based ink flexo
This is the most advanced printing method in the world today, with low cost, good quality and no pollution. But the process requirements are strict, the film surface tension must be above 40 dynes, and there are strict requirements on the PH value and viscosity of the ink. This process is a process vigorously developed in China, but it has been developed slowly due to equipment limitations.
E, UV ink flexo
The features are the same as UV embossing, and the cost is high, but the film surface tension is relatively less strict. Generally, most manufacturers use water-based ink to print, and UV glazing can reduce the cost and increase the printing effect.
F, UV ink screen printing
This new process can be printed on a single sheet or web, with high cost and good quality. Single sheet printing does not need to be put on the shelf to dry, roll printing can be carried out at high speed.
G. Solvent ink screen printing
This is a traditional process. Generally, the single sheet is printed by hand, and the roll material is printed by a linkage. More than 95% is single-sheet printing, with good effect and low cost. However, solvent screen printing inks are harmful to humans and pollute the environment. H. UV offset printing ink. Since resin ink is used for glue, ordinary offset printing cannot print films. Some manufacturers use single-sheet overprinting when printing PVC, drying on shelves, and finally laminating. However, because the ink is not easy to dry and easily smeared, it causes waste and low productivity. With UV offset printing, all of the above problems are avoided, and high-level layered film products can be printed.
I. Gravure printing
Gravure printing rarely prints stickers, but the printing quality is the best of all printing methods and is a potential printing method. As long as the post-press processing is solved in China, the existing equipment can print high-quality self-adhesive labels.
J. Combination printing
Also called compound printing, it is the most advanced printing method in the packaging and printing industry in the world. According to different pattern designs, several methods are used to print on the same pattern to achieve the best visual effect. This kind of equipment is very common abroad. There are two types in China: LINTEC's SR-520B in Japan and SHIKY's F-330. The former is embossed + silk screen, the latter is offset + embossed.
2. Ink drying method
The inks on the film are divided into drying characteristics: oxidative polymerization drying (tree finger ink), volatile conjunctival drying (solvent ink), evaporative conjunctival drying (water-based ink) and photocuring drying (UV ink).
Drying methods are divided into: hot air drying, electric heating drying (far infrared), ultraviolet curing drying.
Requirements for drying: the ink is fully dried; it does not affect the physical and chemical characteristics of the film; it does not affect the characteristics of the adhesive; it has no effect on the base paper.
Methods to improve the drying effect of ink:
A. Use additives to improve the drying speed of the ink. Such as resin ink plus dry oil; water-based ink plus special additives, solvent ink plus low boiling point solvent. However, it should be noted that additives will change the brightness and brightness of the ink, and the bonding strength between the ink and the film cannot be affected by the additives.
B. Change the operating speed of the film material.
C. Change the temperature in the drying oven or change the intensity of the ultraviolet light source.
D. Choose appropriate film materials.
3. Post-press processing technology
The post-printing process of film materials is almost the same as the post-printing process of paper labels. Such as bronzing, laminating, punching, folding, cutting, rewinding, waste disposal, die cutting, etc. are all used for post-print processing of film stickers.
White Oven Control Panel Glass
Factory direct sales oven Tempered Glass control panel, glass plate, can support customization. One-stop customized service, quick mold opening, we are the source manufacturer. It is made of high-quality materials, is widely used, can withstand high temperatures, and is not easy to corrode. We have rich glass and electrical glass deep processing technology and industry experience. All major customers are welcome to come to consult and customize. We have a complete range of products, good quality, competitive price, fast shipping, and good service, so you can buy with confidence and use with confidence. We also sell various types of glass, complete models, and support deep processing. Each product is perfect and you can buy it with confidence. We also provide you with high-quality glass processing to ensure your satisfaction. The glass control panel made of high-quality glass is more durable, more beautiful and more practical. Moreover, it is not fragile for a long time, saving you the time of replacement.China Oven Glass Shattered,Oven Glass Repair,Oven Inner Door Glass,Frigidaire Oven Door Glass, we offered that you can trust. Welcome to do business with us.
Oven Glass Shattered,Oven Glass Repair,Oven Inner Door Glass,Frigidaire Oven Door Glass
WCH Temper Glass Co., Ltd , https://www.temperglasswch.com