Gold silver ink printing of the hottest screen pri

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Gold (silver) ink printing of silk screen printing

with the rapid development of packaging and decoration, more and more gold (silver) ink products are printed by silk printing. Its metal color gives people a feeling of beauty and richness, and is favored by users. There are great process differences and differences between the gold (silver) ink printing of silk screen and the products of offset printing and gravure printing. How can we get good products in the gold (silver) ink printing of silk screen printing

I. composition and characteristics of gold (silver) ink

gold ink is made from the main material copper zinc alloy powder and auxiliary materials such as gold blending oil. Due to the different content of copper and zinc in the gold powder, the color is also different. If the zinc content is low, the color will be red, and if the zinc content is high, the color will be blue. Therefore, the gold powder (ink) sold in the market can be divided into red gold powder (ink), cyan red gold powder (ink) and cyan gold powder (ink). Silver ink is made of silver aluminum powder as the main material and auxiliary materials such as silver blending oil. Silver powder has the difference of particle size, so the metallic luster produced is also different. The silver powder with coarse particles has a stronger reflective luster, while the silver powder with fine particles has a weaker reflective luster

gold ink should choose gold powder with high fineness and low floatability, which is conducive to mixing evenly with solvent during printing and obtaining better imprinting. When mixing gold ink, the dilute consistency should be determined according to the suitability of substrate and climate conditions, and different auxiliary agents should be added to enhance the hydrophilic activity, viscosity and fluidity of gold ink, improve the adsorption performance of gold ink and improve its transmissibility

silver ink generally uses 400 ~ 1000 mesh silver powder. The silver ink prepared with 1000 mesh silver powder has a relatively poor metallic luster. The silver ink prepared with 400 mesh silver powder has a better metallic luster, which is suitable for large-area printing products. In use, special attention should be paid to that silver powder cannot react with acid, otherwise it will react chemically and reduce the luster of metal. Therefore, neutral auxiliary materials should be used for adjustment during inking and printing

the gold powder and silver powder in gold (silver) ink have the characteristics of conductivity, high thermal conductivity, heavy weight, coarse particles, poor adhesion and unstable chemical properties. Therefore, in use, the process must be strictly controlled to obtain satisfactory results

II. Gold (silver) ink formula reference

Formula 1

gold (silver) powder (1000 mesh) 0.2kg

printing gold (silver) oil 1.5kg

gold (silver) oil 0.5kg

blending gold ink. Add some auxiliary materials such as medium yellow ink, gloss oil, red drying oil and white drying oil, dibutyl ester, etc. to enhance the affinity, viscosity and leveling of gold (silver) ink, improve the adsorption and transmission of gold (silver) ink, Suitable for paper printing

formula 2

PVC slurry 120g

perchloroethylene slurry 80g

gold (silver) powder (above 800 mesh) 100g note: gold (silver) powder needs to be soaked in cyclohexanone for a period of time before mixing

pour the medicine on the glass plate table in sequence and mix it with an ink shovel. The gold (silver) ink can be adjusted and used at any time. It should not be stored for too long, so as not to affect the printing effect due to the darkening of gloss after a long time

if the gold (silver) ink dries thick or dries too fast, it can be diluted with cyclohexanone, but xylene cannot be added, otherwise it is easy to cause gold (silver) to fall off. It is suitable for the printing of plastics, plastic products, synthetic leather, leather and other substrates

formula 3

gold (silver) powder (more than 800 mesh) 60% ~ 80%

thick paint 40% ~ 20%

proper amount of grease varnish

dry oil 1% ~ 1.5%

use an ink shovel to mix on the ink mixing table, and add fish oil to increase gloss and viscosity. It is suitable for the printing of substrates such as glass, lacquer paper, lacquer cloth and paper products

III. gold (silver) ink screen printing plate

the printing plate wire of gold (silver) ink printing should be 150 ~ 200 mesh nylon or polyester single wire

the frame of gold (silver) ink printing plate adopts wood frame or aluminum alloy frame, which can be stretched manually or by stretching machine. The stretching should be flat and centered, with uniform tension and moderate elasticity

The printing plate printed with gold (silver) ink can be obtained by direct photosensitive method. Gelatin or polyvinyl alcohol or nylon glue is used as the colloid, dichromate or diazonium salt is used as the photosensitive agent, or diazonium photosensitive emulsion is directly purchased from the market. When applying photosensitive glue on the silk, scrape it as many times as possible, so that the printing ink can penetrate into the substrate

IV. gold (silver) ink printing operation

1. check the printing plate

check the frame sealing condition of the printing plate, whether the printing plate has sand holes and damage, whether the installation of the printing plate and the base plate is loose, whether the distance is appropriate, whether the printing rules are correctly positioned, whether the multi color has the phenomenon of moving the plate, wet the holes with solvent, clean the plate with scrubbing wire, and then ink the operation after the solvent is completely volatilized

2. selection of scraper

the length of the scraper should be slightly longer than the printed text, different substrates should choose scraper with different shapes, and the rubber scraper should have certain flexibility, so as to improve the contact performance between the plate and the substrate and make the printing ink uniform. The blade edge of the scraper shall be flat. If it is uneven, it shall be ground with sandpaper. The scraper material can be made of 5mm acid resistant rubber

3. printing material configuration

the type and composition of printing materials should be determined according to the material of the substrate and the printing requirements. The key to mixing is color matching, dryness and viscosity, and strive to meet the printing requirements. Gold (silver) ink should be prepared and used now, and the amount should not be adjusted too much each time when printing, so as to avoid waste. After a batch of products are printed, the remaining margin will expand, reduce viscosity and darken gloss after a period of time, which will affect the printing effect, and should be discarded and reused

4. printing operation of gold (silver) ink

place the substrate on the table with rules. The viscosity of the lower version should be large, the ink layer should be thick, and the dryness should be moderate. It is better to choose the combination of penetration and conjunctival drying, and avoid the crystallization of the bottom color ink layer. Black ink, blue ink, crimson ink, fuchsia ink and dark green ink are best used as the background ink for printing gold. The above color ink is easy to set off the bright and three-dimensional feeling of gold ink, and its background color should not be too thick and as thin as possible. Silver gray ink is the best base color for silver printing. If transparent yellow is used as the base color, the printing effect of golden luster can be achieved after stacking silver ink. At the same time, it should be noted that gold (silver) printing should be carried out under the condition that the base ink is not completely dry, otherwise it is easy to cause the phenomenon that gold (silver) and gold (silver) colors cannot be printed and will be wiped out immediately

if the substrate of gold (silver) products is paper, the choice of paper is also crucial, and the paper performance must adapt to the process characteristics of gold (silver) ink printing. Offset paper and gravure paper have strong ink absorption. After printing gold (silver), the metallic luster of cash (silver) ink cannot be well expressed. Coated paper, glass paperboard and whiteboard (slightly) with good paper finish are suitable for printing gold (silver) ink. After printing, the metallic luster is obvious, giving people an artistic beauty. In order to prevent the gold (silver) ink products from falling off due to contact with air or other chemical substances, it should be overprinted with viride oil or coated with film after printing gold (silver) ink and other colors

when printing gold (silver), the indoor temperature should also be well controlled. Generally, the indoor temperature should be 22 ~ 25 ℃, and too high or too low temperature is detrimental to printing gold (silver). If the temperature is too low, the fluidity of gold (silver) ink will be reduced. If the temperature is too high, the transferability of gold (silver) ink will become worse. When the indoor temperature exceeds 38 ℃, the plate is easy to be skinned and blocked, which will affect the ink transmission. An appropriate amount of dibutyl can be added to the gold (silver) ink. When printing gold (silver), pay attention not to blow the printing plate directly with the wind

v. adjustment of gold (silver) ink printing operation

problems often occur in the printing process of gold (silver) ink. In order to obtain ideal printing quality, we must reasonably control some variable factors

1. block the printing plate

avoid empty scraping and long downtime when scraping. When the weather is hot, the printing material often blocks the hole of the printing plate, so that no pictures and texts can be printed. It needs to wipe and wash the printing plate. Gently wipe the front and back sides of the plate with absorbent cotton or soft cloth dipped in solvent. When scrubbing, wipe the picture and text first, and then scrub other parts. Both sides of the printing plate should be wiped clean, so that there is a certain distance between the frame, the printing plate and the platen. Hold the scraper to press the wire, and the angle of the scraper should be maintained at 50 ° ~ 60 °. The scraper moves at a certain speed, Under the pressure of the scraper, the printing material leaks through the wire to the substrate. Looking back, after the scraper scrapes, the wire rebounds and separates from the substrate. During operation, the ink volume should be well controlled, and the printing plate should be scraped clean, otherwise it will lead to blocking

for the purity of margin (silver) ink, the printing of gold (silver) ink is usually arranged at the end. In addition to the metallic luster of gold (silver) powder itself, it is more important that it has surface conjunctivity. It uses the reflection of light to form color on the surface. If it is reprinted with other colors, it will lose the effect of gold (silver) ink. Therefore, in printing, we should make full use of the characteristics of opaque and strong hiding power of gold (silver) ink, and try to arrange the gold (silver) ink for final printing, The process design of products should also consider the tension provided by polyester strips. Considering this, the color sequence should be reasonably arranged. If it is necessary to overprint other colors on the gold (silver) color, the graphic area of the layout should be appropriately smaller, so as not to affect the performance effect of the gold (silver) color

to print gold (silver), the background color (commonly known as the background color) should be printed first, that is, the ink with strong hiding power and similar to the gold (silver) ink color should be selected for the background color. When printing gold, the base ink should be light yellow, transparent yellow or fake gold ink. In order to improve the metallic luster, an appropriate amount of gold ink of about 10% can be added. When printing silver, fake silver ink is generally used as the base, and its formula can be appropriately mixed with diluent, white ink, black ink, de adhesion agent, No. 6 inking oil and white drying oil. The printing adaptability of silver ink is better than that of gold ink. One printing can basically meet the needs of printed matter. If some large-area silver printing products or poor paper are encountered, it is necessary to use two printing to show silver luster

printing gold (silver) on the background ink refers to printing gold (silver) ink on the ink with strong covering power, which can not only save ink, but also improve the gloss of gold (silver) ink layer and strengthen the process effect of gold (silver) ink. The printing quality of base color ink is the basis for improving the printing quality of gold (silver) ink, so it is required that the printing surface of base color ink should be flat, the ink blockage should be dredged, and the solvent on the printing plate should be sucked dry. At the same time, dibutyl can also be properly added to the printing material, but its viscosity is heavy, so the scraped substrate should not be stacked too thick to prevent the printing product from adhesion

2. The printing plate is sticky

the printing plate is sticky because the distance is too small and the elasticity is not enough. The distance should be appropriately increased, generally 3 ~ 5mm

3. printing plate ink leakage

the main reason for printing plate ink leakage is that some places are not sealed when the printing plate is sealed, and the glue at the ink leakage of the printing plate should be sealed again

4. printing plate, printing mark and paste

the back side of the printing plate is rubbed dirty, and the imprinted paste is that the prepared printing material is too thin, and the printing material leaks to the bottom during scraping, which led to the more important plastic material transactions in the United States in the second half of 2014, including:. Imprinting paste can thicken the printing material appropriately, or use the scraper to control the amount of printing material appropriately. Author unit: Hubei

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