Factors that should be paid attention to in the fo

2022-08-14
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Factors that should be paid attention to in the formulation design process of UV sanding ink

UV sanding ink, also known as metal like etching ink, is a new type of UV. The Railway Construction Research Institute of China Academy of Railway Sciences and Shanghai Huafeng new material research and Development Technology Co., Ltd. have cooperated on the polyurethane curing track bed project to develop luminous curing ink. Its printing method is silk printing, and the substrate is mostly gold Materials with strong mirror effect, such as silver cardboard or other paper plastic composites, are dried by UV curing. Because its prints have a strong sense of sand, beautiful, elegant, generous, so it is promoted very quickly. In just a few years, it has occupied a considerable proportion in the field of high-end packaging and printing, such as cigarette bags, wine bags, cosmetics and so on

however, due to the low investment threshold of this ink, the level of formula designers is uneven, and the available raw materials cover too many areas; At present, there is no international or domestic standard for this ink. Therefore, in the printing process, especially in mass industrial production, there are inevitably some problems. Let's talk about several factors that should be considered in the formulation design of UV sanding ink for peer reference

I. printability of UV sanding inks

generally speaking, when UV sanding inks are printed in small batches, there will be no serious printing problems, but when using full-body dynamic printing machines for mass and high-speed production, there will be problems. For example, after printing thousands or tens of thousands of copies, UV sanding ink cannot be completely and densely spread on the silk, resulting in uniformity in the sanding state; UV sanding ink is too thin or incompatible, resulting in edge running, bottom exposure, etc. To solve this kind of problem, we should first pay attention to the following three points in the formulation design of UV sanding ink:

1. Ensure that the thixotropy of UV sanding ink is good, relatively thick at rest and relatively thin at printing

2. Ensure that UV sanding ink has appropriate viscosity and adhesion to silk

3. It is necessary to ensure that the UV sanding ink has a proper thickness

second, the quality of raw materials of UV sanding inks

there are residues when printing UV sanding inks in large quantities, which is a headache for many printing manufacturers, because a large number of residues not only greatly increase the cost of printing manufacturers, but also seriously affect the production efficiency. Then when designing UV sanding ink, we must carefully examine the raw materials used

1. Ensure that the particle size of raw materials is compatible with the number of wire mesh

2. Ensure that all raw materials have good compatibility, no chemical reaction, good printability and high over rate; Third, if it is stored as required (in a cool place, closed, away from light) and printed under normal conditions (℃), there will be no dark reaction. Even the smallest gel or photosensitive reactant will lead to the decline of printing suitability and over rate

III. raw material composition of UV sanding ink

in order to reduce costs, some printing manufacturers will use some gold and silver cardboard with relatively poor quality, which is prone to UV sanding ink slightly dissolving the gold on the gold cardboard, and even dissolving all the gold in serious cases, making the whole print white. Then, to overcome this kind of problem, when designing the formula of UV sanding ink, we must fully consider the composition of various raw materials, ensure the proportion of components with large molecular weight and components with small molecular weight, and prevent substances with small molecular weight from dissolving. The importance of adamantine degree is that it determines the background color of the stability card when the parts of electronic universal testing machine are in service. Of course, reducing the exposure and shortening the time from printing to curing will also have a good effect on overcoming the whitening of prints

IV. drying problem of UV sanding ink

due to the different UV lamps used by various printing manufacturers, which have the advantages of high precision, wide speed regulation range, compact structure, convenient operation, stable performance, different power, and different printing speeds, it may cause the use of the same UV sanding ink to cure imperfectly in one manufacturer, but over cure in another manufacturer, and too much photosensitizer residue. If it is not cured thoroughly, it will turn sticky, and too much photosensitizer residue will aggravate the smell of printed matter. Therefore, UV sanding ink formula to have a strong pertinence, we must fully understand the printing factory's machinery and equipment, UV lamp quantity, power, printing speed, etc

then according to the actual situation, on the one hand, ensure the appropriate drying speed and minimize the residue; In addition, try to use odorless photosensitizer, which can ensure that UV frosting ink is basically odorless after curing, and does not anti stick

in short, in the design of UV sanding ink formula, we must fully understand the performance of various raw materials in UV sanding ink, comprehensively and accurately investigate the compatibility, stability and printability, and constantly explore and improve after repeated tests and trials, so that the components of UV sanding ink can better meet the requirements of printing manufacturers

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