Causes of discoloration of printed gold in printing process

meizhenhuang

In modern printing, in addition to the bronzing (silver) process, offset printing gold (silver) printing process is also used by many manufacturers. Gold printing (silver process has the characteristics of fine and firm imprinting, good metal texture, strong hiding power, high floating power, etc., can show a strong metallic luster, and the cost is low. Generally, China printing company can directly choose gold (silver) The finished product of color offset printing ink can be printed in two ways: copper-gold powder (aluminum-silver paste) and offset-printing gold oil self-adjusting salty gold and silver ink.

However, in the offset printing gold printing process, if unskilled technicians use this printing process, it will often cause the phenomenon of discoloration of the printed gold, resulting in a big difference between the printed product and the actual high-quality product, or it is not at all similarly, there is no doubt that this result must be redone, so a lot of manpower, financial resources and time will be wasted. In order to avoid this situation, we must find out the reason so that this situation will not recur. So what are the reasons for the discoloration of printed gold?

1. The PH of the paper

Due to improper handling in the pulping and paper making process, such as the presence of organic acids in the pulp or residual chlorine during bleaching, it will make the paper acidic, while adding alkaline fillers and coloring materials will make the paper alkaline. If the paper is acidic, the acidic paper will play a role in inhibiting the drying of the imprinted oxidized conjunctiva, which will slow the drying speed; while the paper with too strong alkalinity will continuously transfer the alkaline substance during the printing process to the hopper liquid. The originally weakly acidic fountain solution is neutralized, which affects the normal pH value of the fountain solution, causing the remaining ink to be discolored and deteriorated. In addition, it will emulsify the ink and cause floating. Therefore, the pH value of the selected paper is 7, which means that it is neutral, which can effectively avoid discoloration.

2. Oxidation of copper-gold powder and aluminum-silver paste

Silver powder and gold powder have the disadvantage of being easy to oxidize and discolor. Therefore, unused gold and silver powder must be kept in airtight as far as possible, and the storage time should not be too long.

3. Printing speed

If the printing speed is too fast, it is easy to cause intense abrasion between the ink rollers, and the heat generated will change the color of the ink. The general experience is to control it at 5000 sheets per hour.

Fourth, the pH of gold oil

Both silver powder and gold powder have the property of being easily oxidized, so the gold adjusting oil used must be a fast-drying, fast-curing, high-viscosity resin oil with low oxidation and neutral pH. In order to avoid oxidation due to long-term storage, it is best to use instantaneous The self-adjusting method of instant adjustment can further improve the anti-oxidation and discoloration.

5. The pH value of fountain solution and the balance of ink

Utilizing the principle of lipophilic and hydrophobic, non-graphic and non-graphical offset printing, the acidic substance in the fountain solution can clean and remove dirt on the plate surface, but too strong acidity can easily cause discoloration of the printed gold. Loss of metallic luster, causing quality problems such as printing plate pattern, slow drying of imprints, and dirty back side; while the acidity is too weak, and the printing plate dot graphics become dirty and stale. Therefore, the PH value of the general fountain solution should be controlled at 5-6. The balance of ink and water is to use as little water as possible on the premise that the printing plate can not be dirty and paste, so that the emulsification amount of the ink is controlled within the minimum range of 25%. Too much water can easily cause the printing gold ink color to be too light, the gold ink is dull, the color is not bright, the gold ink is emulsified, and the paper is stretched and deformed to cause inaccurate overprinting. And there are problems such as parallel paste printing, so it is very important to master the balance of ink and wash.

meizhenhuang

What effect does the hot stamping temperature have on the quality of hot stamping?

meizhenhuang 2022-01-17

What effect does the hot stamping temperature have on the quality of hot stamping? The hot stamping temperature must not be lower than the temperature resistance range of the anodized aluminum. ToTo determine the correct hot stamping temperature, you need to consider these factors, including the model and performance of the anodized aluminum, the stamping pressure, the stamping speed, the stamping area, the structure of the stamping graphics, the color and thickness of the ink layer of the printed matter, The area and room temperature of the hot stamping workshop. To In summary, the hot stamping temperature still has a great influence on the hot stamping quality. Therefore, the correct adjustment of the hot stamping temperature has become the key to the printing quality.

Several non-paper cover materials for hardcover book printing

CharlotteJoe 2022-04-13

Making hardcover books in China printing company involves more than just a variety of paper materials. For example, the following common non-paper materials can be used to make hardcover book covers. If it is a hardcover book that is frequently flipped through, I would recommend that you prioritize sturdy fabric mounting. The third is wood, wood is used to make hardcover book covers? Today, this mounting method has also been loved by many book binding artists, and is often used for some traditional book binding.

How startup designs should communicate with designers?

KathleenAnn 2022-06-08

If you're working with designers, learn how to communicate effectively with designers in this article. After sorting out, we have come to the following four points that must be paid attention to before communication: 1. , so as not to let both parties in the design process There is a sense of gap between them. During the revision process, you can share what you like and dislike. But we also need to keep an open mind and listen to and respect designers’ opinions.

Suggestions on how to reduce printing color difference

BookPrintingChina 2022-06-15

Then, as professional book printing companies, the following suggestions are given to reduce the printing color difference. However, the large version is generally divided into two types: one is digital printing, and the other is offset printing. The two use different printing methods and printing machines, and the printing method depends on the requirements for large goods. Therefore, in order to use combined printing and want to reduce the problem of printing color difference, we have the following suggestions:1. Control the total color value within 10 – 250Printing with spot colorThe most effective way to reduce the chromatic aberration of the same batch of printing is, of course, to use spot color printing.

10 Frequently Questions of China book Printing

ShirleyAmy 2022-06-01

The price of book printing consists of the following parts: the full price of the paper used, the design fee, the plate making fee (including the film), the proofing fee, the printing plate (PS version), the printing fee, and the post-processing fee. What is spot color printing? In packaging printing, spot color printing is often used to print large-area background colors. What kind of products will use spot color printing? In the case of comprehensively considering improving the printing quality and saving the number of overprints, it is sometimes necessary to use spot color printing.

Common faults of book printing and laminating process

chinaprinting4u 2022-02-25

The film shall be replaced and the film with small thickness tolerance shall be selected. The qualified film shall be replaced in the book printing. Both rollers shall be adjusted⑤ Insufficient tension will cause uneven film speed, which will cause film wrinkling. When the relative humidity is too high, the paper absorbs moisture and has a "lotus leaf edge", resulting in paper wrinkling in the film covering process of book printing. In this case, the pressure shall be corrected first, and then the machine shall be started for operation.

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