Discoloration and discoloration of printed products
1. Discoloration of the ink drying process In the printing process, the freshly printed ink ink and the dried ink ink are compared. The freshly printed ink is darker. After a certain period of time, the ink will become lighter after the print is dried. This is not the problem that the ink does not resist light fade and discoloration. It is mainly the discoloration caused by the ink penetrating and oxidizing the conjunctiva during the drying process. The letterpress ink is mainly based on osmotic drying. The product that has just been printed on the printing press table has a thicker ink layer, and it takes a while for the penetrating and oxidizing conjunctiva to dry. Then, a large part of the binder in the ink will penetrate into the inside of the paper fibers, and the ink layer after drying through the oxidized conjunctiva will become thinner and the color will become lighter. This is an unavoidable phenomenon that is often seen. In the printing, the ink color should be controlled to be slightly darker than the color of the original printing sample. When the ink is dry, the color of the proof ink will be met. The color rendering mechanism of prints is carried out by subtractive coloration. Sunlight, fluorescent lamps, incandescent lamps, and other light particles that illuminate fine particles of ink pigments. The color light reflected by the selective absorption of light by the pigment can show beautiful colors. The deeper the light passes through the ink film, The reflected color light becomes more saturated, so the ink layer is thicker and the color is deeper; the transparency of the ink is good and the color is brighter. 2, the ink itself is not resistant to light faded ink in case of light back color, discoloration is inevitable, all inks will have different degrees of fade, discoloration phenomenon after light. Light color ink fades after a long period of light exposure, discoloration is serious. Yellow, magenta, and green fade quickly, while blue, blue, and black fade slowly. The actual work in the transfer of ink, should try to use good lightfastness performance, adjust the color should pay attention to the lightfastness after the ink dilute, in the deployment of ink should also consider several colors of ink between the performance of lightfastness Sex. Outdoor advertising posters due to exposure to sunlight easily fade, we must consider the lightfastness of ink. The same blue ink, indigo blue than light blue, peacock blue light, not easy to change color. Gray can be a little black ink and white turnip ink in white ink; Emerald green available in a single color phthalocyanine green, not enough yellow, then you can add lighting resin yellow ink, if you add a little more white ink color more vivid. If you use peacock blue and chrome yellow ink, it will fade, change color, and yellow over time. 3, the acidity and alkalinity of the paper on the bundling, discoloration of the ink under normal circumstances, the paper is weak alkaline. The ideal paper has a pH value of 7 and is neutral. Due to the need to add caustic soda (NaOH), sulfides, chlorine, and other chemicals in the papermaking process, improper handling in the pulp and papermaking process may cause paper. Acidic or alkaline. There is a certain amount of residual chlorine and organic acid in the slurry. If not properly processed, the paper produced is acidic; if alkaline fillers and colorants are used in the papermaking process, there is residue in the slurry. Alkaline solution, but without the necessary treatment, so that the resulting paper is alkaline. The paper's alkalinity comes from the papermaking process itself, but also from the binder containing the alkaline substance used in the post-order bookmaking. If battoin and other basic binders are used, alkaline substances can penetrate the paper fibers and react chemically with the ink pigment particles on the surface of the paper, causing them to fade and discolor. When selecting raw materials and adhesives, we must first analyze the physical and chemical properties of the adhesives, papers, and the effects of acid and alkali on inks, paper, electro-aluminum foil, gold powder, silver powder, and coating film. 4. Discoloration and discoloration caused by temperature Some packaging and decoration labels are affixed to rice cookers, pressure cookers, electronic ignition stoves, kitchen appliances, and the inks quickly return to color and change color under high temperature conditions. The heat resistance of the ink is about 120°C. Offset presses and other printing machinery and equipment operate at high speeds. The ink and ink rollers, inks and plate layouts are subject to high-speed friction and heat. The inks will also generate heat at this time. Especially, red and white kerosene are added to the ink to dry the ink. The process will be hot, requiring the ink to have better heat resistance. Printing gold and silver printing products should pay attention to the fact that the delivery table cannot be over-printed. Otherwise, the printed matter will fade or change color due to heat. The solution is to use paperboard for layering, thin the stacking, and reduce heat. 5. Discoloration caused by inappropriate color sequence of printing. The color sequence commonly used in the four-color version of the electric splitter is: Y, M, C, Bk. The four-color machine is the order of inversion: Bk, C, M, Y What the four colors of ink are printed first and what is printed afterwards will have an effect on the fading and discoloration of the printing ink. In particular, posters, posters, posters, couplets, and advertisements for advertisements are used in the actual production of these products as advertisements for outdoor advertisements. Therefore, the lightfastness of prints will be taken into consideration when printing. Heat resistant properties. Because these products are affixed to the outdoors to be exposed to the direct sunlight of the sun's ultraviolet rays, the weather will be long and long, and the wind and rain will cause the colors of the prints to fade and discolor. The long-term exposure of outdoor products only C, BK two kinds of deep-colored ink is still part of the remaining, Y, M two colors are removed, which shows that C, Bk two kinds of ink light resistance, heat resistance is better. Therefore, advertisements, New Year pictures, posters, couplets, and other printed matters posted outdoors should be printed with Y and M colors in order to reduce the exposure of sunlight to UV rays. The fading problem of prints. When arranging printing color sequence, inks are firstly printed on color and easily faded and discolored, and dark color inks are printed afterwards to prevent discoloration and discoloration. When using desiccants should pay attention: Red dry oil itself has a deep purple color, when used in the deployment of light-colored ink will have a slight impact on the ink, deployment of darker colors of ink with red dry oil; white dry oil is not dry before the white, The conjunctiva is light brown after drying, and when mixing light-colored inks, if too much dry oil is added, it will be light brown. Reprinted from: Guangdong Printing Network A shoe rack is a storage unit designed for holding shoes. Shoe racks may be free-standing to place inside a closet or may be built into a closet organizer system. The right type of rack for you depends on the number of shoes you have to store and where in your home you want to store shoes. Modern Shoes Rack,Shoes Bench,Shoes Cabinet,Storage Rack,Wooden Shoes Rack,Wooden Shoes Cabinet,Shoes Storage Cabinet Jinan Tri-Tiger Technology Development Co., Ltd , https://www.jinanfurniture.com
1 The acidity and alkalinity of paper has a great influence on the printing process and the color durability of prints. Paper acidity and alkalinity have a direct effect on the drying of the oxidized conjunctiva of the blot, and the acid blotting of the large paper blots is particularly slow, because the acidic substances can inhibit the drying of the imprinted conjunctiva.
2 The acidity and alkalinity of the paper can also cause the ink to fade or discolor. Raw paper pH value is less than 7 is acidic, is more than 7 is alkaline, acid strong paper and due to the water bucket solution is also weak acid and other factors, it will affect the ink, make it discoloration, such as peacock blue acid after the green .
3 ink alkali resistance worse. Basically all inks will fade or change color when they encounter alkali. The chrome yellow ink base turns red, and the paper in the basket is alkaline and fades. In particular, gold ink, silver ink, and electro-aluminum foil gold foil will lose their original luster when they encounter alkaline substances. The golden light color turns into pale yellow, silver ink turns black and does not shine, and the adhesion is reduced, often resulting in scrapping of printed materials. .
6. Rejection and discoloration caused by improper use of kerosene
Red dry oil, white dry oil added in the ink does not exceed 5% of the amount of ink, about the amount of about 3%, dry oil in the ink layer has a strong drying effect, and fever, if excessive dry oil Large, it will fade the ink discoloration.
1 Separated from the air, use now to avoid conjunctiva;
2 The desiccant content in the ink is 3%. Do not overdo it, otherwise crystallization and fading and discoloration will occur easily;
3 The second color puts a little more than the first color;
4 In winter, when the climate is cold and the temperature is low, you should put a little more; in the summer, you should put less.
Many people who have a large shoe collection have built-in racks in their bedroom closets. Each rack may hold several pairs of shoes. Some shoe racks are slanted wooden boards that have a strip running across the back to rest the heels of the shoes on so that the shoes are displayed for easy selection.
Other types of shoe holders are white metal stackable shelves that are either part of a closet shelving system or are a part of a free-standing rack. With the shelf type, you can just place pairs of shoes on the shelves side by side. Some kinds of shoe racks have curved wire loops that you place the shoes over.
A shoe rack is an alternative to shoe boxes. Clear acrylic shoe boxes that each hold one pair of shoes can be stacked anywhere and some people prefer to use these for shoes not worn too often. Shoe boxes may be stored up high in a closet, while the racks are usually on the floor or at eye level to allow easy access to the shoes.
Shoe racks can be added to entryway closets to avoid the clutter of shoes in the hallway near the front or back door of a home. Some people like to keep a small shoe rack near doors to hold shoes worn daily and/or guest's shoes. While the looped type can typically be only used to hold shoes, shoe shelves can be used to store practically anything from rolls of gift wrap to children's toys to extra pantry supplies. Free-standing racks usually fit into any type of closet and keep items organized and out of sight.