Ways to Improve the Quality of Offset Printing Gold

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In cigarette packs, wine boxes, and food packaging, the gold printing method is often used to embellish the theme of commodity packaging design to achieve eye-catching and luxurious visual effects. The gold ink used in the gold printing has 800 meshes, 1000 meshes, 1200 meshes, and 1500 meshes (the "mesh" indicates the coarse and fine meshes of the copper powder particles, and the larger the mesh is, the smaller the particles are). Gold ink is composed of copper powder, gold transfer oil, transparent yellow, red dry oil and so on. 800-point copper particle printing version is better in the field, 1000-1200 mesh copper powder offset printing fine products. There are essential differences between offset printing and letterpress printing, copper and zinc printing, and resin printing. Printing ink is not used for letterpress and resin printing, and water is required for offset printing. The glossiness of letterpress and resin printing is better. Offset printing gold gloss is not easy to grasp, offset printing gold has a simple process, printing speed, the gold pattern of light brightness is good, overlay printing color accuracy is high, to meet the requirements of high-end packaging products, offset printing is line contact, letterpress Copper, zinc, and resin versions are point contacts, so the accuracy of the rules for offset printing is much higher than that of other printing methods.
The quality of offset printing gold products is inextricably linked to the quality of the paper used, the underlying color, the process technology for printing gold, and the method of printing operations. Only in the process of offset printing is the quality of each link strictly controlled. Off, can print beautiful products.
First, the relationship between offset printing and paper Offset printing is usually used for copperplate paper and whiteboard paper. To improve the quality of offset printing, it is necessary to start from the purchase of raw paper, and the raw materials that are not qualified are not imported into the factory or stored. It is required that the surface of the paper be smooth, solid and smooth, and the whiter the whiter the better. The absorption and reception of the ink is very good. The surface of the paper is not de-powdered, the ink absorption is proper, and the pH of the paper is neutral. In sum, Good quality paper is a prerequisite for improving the quality of offset printing.
Second, the offset printing process technology has gold offset printing products, in the production process of the production department should assist the offset printing shop overall arrangements, comprehensive consideration. In the packaging of the product design, plate making, offset printing should be fully analyzed in all aspects, the things are expected to be more comprehensive, on the whole to highlight the offset printing gold products eye-catching, luxurious, beautiful feeling.
1 Try to avoid the phenomenon of crystallization caused by overprinting of the main colors and large areas, so that the offset printing cannot be printed.
2 There are printed lines, images, and texts in the process of designing the packaging and decorating of goods. Generally speaking, they should not be too thin.
3 In the same area, it is not possible to print gold on a large area and the words are printed together. In this case, there is another gold on the ground, and there are tiny gold-printed words. However, the full amount of ink used in the printing of gold on the ground is greater. After a large amount of text and lines, there will be stencil problems. It is not easy to grasp the amount of ink used.
5 When designing printing color sequence, consider putting gold on the back.
5 When designing merchandise packaging products with offset printing, design a background as much as possible. Usually printed a false gold transparent yellow, and then printed with gold powder, the effect is very good, transparent yellow bottom, printed gold is generally the last reprint, strong hiding power.
6 Put gold on the ground in black, red, and blue as much as possible so that there is a bottoming effect. The printed product that is printed out of gold has a better gloss.
7 The surface of the blanket is seriously worn, and the light, hardened and used for a long time must be replaced with a new blanket to print gold.
Third, offset printing gold and the relationship between the background offset printing gold to take the first to print a transparent yellow and gold under the method of laying a background under the ground, so that the gold will be more glossy, regardless of the color of the ink shop a background color, will be The coloration of gold ink plays a special role in the setting of a basic tone. A layer of ink is printed first, which fills in the fine pores of the surface of the paper and allows the gold ink to be printed to reflect its inherent light.
Fourth, several problems that offset printing gold should pay attention to The formula of offset printing gold golden ink is:
Printed version of the field, lines 05-25 transparent yellow 1000g
1000 mesh gold powder 1000g
Gold transfer oil 1000g
Red dry oil is added to the printed dot and fine line gold ink formula:
1000 mesh gold powder 1000g
Gold transfer oil 1000g
Red dry oil is added in a proper amount (Red summer oil is put in high temperatures in summer and put more in winter)
1 The offset speed of the offset printing machine should not be too fast. Offset printing ink is used for cash transfer. Generally, the machine is used up within half a day to avoid oxidation discoloration of gold powder.
2 It is a key to control the balance of water in the offset printing machine with the smallest amount of water to print gold on the premise of not printing the plates. Otherwise, the water will emulsify the gold ink and affect the appearance of the gold gloss.
3 adjust the offset roller lining, press the pressure when taking a neutral lining, it is best to use the blanket below the paper to increase the pressure.
5 Adjust the pressure between the plate cylinder and the ink roller. It is better to press the gold at a slightly lower pressure.
When the background color is 5, it should be printed and leveled, and the drying time must be mastered. Before the background color enters into the dry state, the ink film surface will be printed with gold immediately when it is sticky. This will prevent the crystallization phenomenon of the underlying ink from printing on gold.
V. Reasons for the color change of offset printing gold and its exclusion methods The main reason for the discoloration of offset printing gold products is that the gold powder used for printing gold is a sheet of fine and small metal copper powder with unstable chemical properties and encountered acid, alkali, carbonic acid, and sulfuration. Everything will react chemically and generate other substances that will make the gold powder lose its original luster.
1 It should not be exposed to the air during the custody process, and chemical reactions with water molecules and water vapor should be blackened. Covers should be covered when storing the gold powder.
2 Coated paper, offset paper, and white board paper If the PH value in the paper is not stable, the residual chemical substances such as chemical pulp, sulfides, and fillers such as sulfuric acid and bauxite in the papermaking process will make the gold ink black and not bright.
3 When deploying gold ink, it is best not to use metal containers, acids, alkaline materials to adjust the ink, gold transfer ink application of neutral materials, porcelain boxes, wooden boxes, plastic boxes are more suitable.
5 When the offset printing gold is in large quantities, it cannot be piled up too much and stacked as thin as possible. Because the gold ink emits heat during the drying process, the oxidized conjunctiva is dry. Excessive stacking will affect the heat release, so that the gold product will not shine. .
5 Always wash and clean the rubber when it is offset. To prevent ink fountains and ink rollers from being stained with other miscellaneous inks to discolor gold inks, and to wash them off at noon for dinner; to join the gold inks immediately after washing ink buckets, be sure to remember to wait until the ink fountains are dry and then put them in gold ink.

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