The packaging and printing world is full of products, and the application of new materials, new technologies, and new processes is changing with each passing day. How to keep up with the development of the times and how to keep improving in the existing printing process is a realistic problem that is placed in front of every printing practitioner. As a kind of transparent plastic box packaging that is highly respected by the majority of users and consumers in the packaging process, it has developed rapidly in recent years due to its transparent, beautiful and intuitive functions. I have dealt with ink for many years. From the perspective of the application of ink in the printing process of transparent folding plastic boxes, I have analyzed various problems and solutions in the printing process, and I will do with readers on the new technologies and new processes in the printing process of transparent folding plastic boxes. communicate with.
1. Printing technology and ink of transparent plastic box
The current technology for printing transparent plastic boxes presents the coexistence of several printing methods: offset printing, silk printing, flexo printing, and gravure printing. The inks used are mainly solvent inks and UV inks. As we all know, with the implementation of the EU ROHS Directive, human beings increasingly pay attention to environmental protection of the living environment, coupled with the inherent environmental protection, high efficiency and energy saving features of UV inks, UV inks have been widely used in transparent folding plastic box printing.
From the perspective of offset printing, silk printing, flexo printing, and gravure printing, offset printing is favored by the majority of users because of its beautiful dot printing, but the disadvantage is that it requires secondary processing after printing, which is time-consuming and labor-intensive. Silk screen is popular with users because of its strong three-dimensional sense and flexible small batch orders. The disadvantage is that its efficiency is low and mass production cannot be achieved. Flexo printing will lead the trend in the printing and processing of transparent folding plastic boxes in the future due to its powerful online processing capabilities and flexible module combination methods (offset printing, flexo printing, gravure printing, and silk printing integrated online).
2. Common problems and solutions of UV ink printing in transparent plastic boxes
The printing material of the transparent plastic box is various plastic sheets (such as PVC, PET, PP, etc.). For the printing of such low surface energy plastic film materials, an analysis of the common problems of UV ink printing in various printing methods (see Table 1).
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3. The new technology of UV flexo printing is applied in the printing of transparent plastic boxes
In the printing of transparent plastic boxes, the application of white ink is very wide. For example, the use of white ink as the primer process, offset printing can not achieve high hiding power and high white due to the limitation of the thickness of the ink layer (1.5 to 2.0 grams per square meter of ink layer). Degree requirements. If considering the thickness of the ink layer, screen printing should be the best choice for the white ink priming process (ink layer 8-14 g / m2), but the lithographic screen is inefficient, and the rotary screen due to excessive equipment costs, As a result, UV screen printing cannot get more development. Now, with the cooperation of many partners, XSYS PRINTSOLUTIONS has successfully developed a new generation of UV flexo white ink (FLEXO IVORY UFW series) process that challenges screen printing and has been successfully applied to a variety of products. Above. The following describes the working principle of the process.
The flexo printing white ink process is a brand-new UV flexographic white ink (different from traditional flexo printing ink) printing process. Compared with the traditional anilox roller, the hiding power is higher, and it needs to be used in conjunction with the new anilox roller technology. .
With flexo printing, ink formulation design should consider:
· High hiding power (no yellowing) under high-speed printing conditions (100m / min);
· The best ink viscosity and additives to ensure fluidity and prevent pinholes;
· At the same time can meet the requirements of combined printing.
ART anilox technology:
· Improved spiral and three-dimensional spiral network structure, using laser manufacturing technology;
· The surface, arrangement and structure of the net hole are designed with unique technology;
· The surface is smoother, and the cooperation with the doctor blade makes the deposition effect more obvious;
The experiment proves that 90.0 BCM of ink storage can be obtained on the anilox roller.
UV flexo printing can replace UV screen printing:
· Research has shown that on-site performance can achieve the hiding power of rotary screen printing. There is still a gap in the performance of very fine characters.
· Experiment by XSYS proves that the performance of text larger than 8 pounds is not worse than that of screen printing.
Hiding power test method:
· The printed sample is placed on a black background, and the color density of the black background is measured as the object of comparison. If the contrast ratio is 100, it means that all are covered.
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4. Cold bronzing process in transparent folding plastic box
Application in printing
As a new technology, cold stamping technology has been recognized by the majority of manufacturers. Here is an introduction to the new application of cold bronzing process.
1. Cold print first
The bronzing process is no longer limited to simple surface bronzing silver. Using the high gloss feature of the bronzing film and the high transparency UV ink, you can get a kaleidoscopic bright gold and silver effect, and greatly reduce the cost of buying colorful bronzing film .
The problem is to pay attention to ink adhesion and printing effects. The solution is as follows:
â‘´Choose printable cold foil film;
⑵ Pre-coat the cold bronzing printing primer on the cold bronzing film to increase the bonding force between the ink and the cold bronzing film;
⑶Select the correct ink, and add ink additives to increase the adhesion of ink;
â‘·After printing, add UV varnish.
2. Holo-graph INK Process HIP
· The image is realized through the printed version;
· Using UV curing ink or adhesive;
· The holographic image is stuck on the "wet" UV ink or adhesive;
· After passing through the UV drying unit, the ink or adhesive will be cured, so that the holographic material is attached to the substrate, creating a holographic ink printed image.
3. HIP brings benefits to customers
· The product is unique and cannot be copied;
· Attract consumers and make them pay attention to this brand;
· For brand owners, meet global anti-counterfeiting requirements;
· Provide the lowest cost holographic method (lower than blanching);
· Applicable to various ink printing technologies, especially suitable for combination printing;
· Can achieve holographic effect of different colors;
· Can print holographic dot image to meet the different requirements of label on image position and color,
· It is much faster than blanching;
· If you use holographic substrates, it is difficult to achieve cost reduction.
4. HIP unlimited creativity
· The final design is determined by the following three aspects:
· Metal film style: divided into standard style, alternative style, customized style and anti-counterfeiting style;
· Ink / adhesive color;
· Image design.
· The same metal film can create 1000 different colors and styles. The standard style is shown above.
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