Fragrance printing and liquid crystal printing
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First, the fragrance printing
The key to this type of printing is to enclose the fragrance in a capsule and then incorporate the ink as needed.
1. Applying to the smell of printing
When it comes to printing, it always feels like an eye. In fact, it is indeed based on vision, but the reality has changed, and it is still not able to resort to the printing of the sense of smell. This is called the method of microcentralization. It is possible to print printed matter showing various flavors such as foods and flowers, such as gift cards, new year films, magazines, albums, etc. For example, if a photo of a flower is printed on the catalogue, the reader will wipe the flower with his nails. The scent of the flower is emitted; if the apple is on the sheet, the apple scent is emitted after rubbing it.
In fact, this printing method is not difficult to understand, it is to work hard on the ink, first make a variety of spices into capsules, into the ink to be used, according to the content of the screen to select ink to print. For the printing surface, the printed image is rubbed with a nail or a coin to break the capsule in the ink, and the capsule is broken, and the fragrance sealed in the capsule is scattered and temporarily floats in the air. This fragrance odor has a longer retention period in the print.
2. The impression of color and fragrance is just right
The scented perfume ink is transparent. The whole printing process is that the color and graphics on the screen must be associated with the scent. When the base image is printed with offset printing, the screen printing and the fragrance ink are used to print the scent of flowers or food, usually It is very good to print in such a two-step process.
Screen printing is used to avoid damage to the capsules in the fragrance ink. At the same time, because the screen printing ink film thickness is about 20 times higher than the offset printing, it is convenient for long-term retention of the fragrance, but it has recently been developed for offset printing. Special ink. For example, a general offset printing press can be used. That is, the five-color machine or the six-color machine prints CMYK and other colors at a time with the base map and the portion with the scented ink. At this time, special attention should be paid to not damaging the capsules in the fragrance ink.
It is also important to draw the attention of ink manufacturers that the method of manufacturing inks should be changed accordingly due to the characteristics of the printing method. How long does the durability of the fragrance ink last? If you use the ink for screen printing to print, you can save about 10 or so. If you use ink for offset printing, you can keep it for half a year to a year.
3. Types of spices
Fruit flavor: green apple, cherry, blueberry, strawberry, watermelon, white melon, orange, pineapple, grapefruit, grape, banana, apple, grape juice, peach, lemon.
Flowers and plants: artichoke, cosmos, camellia, alfalfa, cherry blossom, orange blossom, amaryllis, camellia, rose, calamus, purple flower, wild rose, plum, primrose, hyacinth, orchid, jasmine, vine, xiacao, Herborist, daffodil, mother chrysanthemum, daffodil, primrose, carnation, lily of the valley, lilac, chrysanthemum, violet, lavender, osmanthus, dahlia, gentian, hazelnut, tulip, lily.
Beverages and food: whiskey, cocoa, mustard, curry, coconut, pine umbrella mill, garlic, pepper, pink tea, toffee, cola, mayonnaise, lemon tea, coffee, vanilla, milk tea, chocolate, peanuts.
Others: fog, mosquito coils, forest, cedar tea, alfalfa, cinnamon, mint, sage, white sandalwood, soap, pine.
Second, LCD printing
This printing principle is the same as the above-mentioned scent printing, in which the liquid crystal is encapsulated and incorporated into printing ink for printing.
1. What is the LCD?
The liquid crystal is a substance having liquid fluidity and having the same optical properties as the crystal, and a cholesteric liquid crystal is usually used. The appearance of such a liquid crystal is transparent liquid. The amount of liquid crystal blended in the ink is suitably 40% of the total ink amount, and the thickness of the ink film is about 30-60 μ. The printed product has different reversible reactions and irreversible reactions depending on the needs.
2. The color changes with temperature.
Liquid crystal printing is actually a special printing technique that uses temperature to change the color of the ink. First, a liquid crystal having such characteristics as to change the printing color is formed into a capsule, which is then wrapped with gelatin and then incorporated into an ink to prepare a special ink for liquid crystal printing.
The color change of the liquid crystal is discolored and folded according to the temperature, and can be changed to 4-7 colors. The general color change order is changed in the order of ink → tea → blue. When the liquid crystal is green, it means the standard temperature of the liquid crystal. For example, a liquid crystal for 20 ° C is used to exhibit green color at 20 ° C, a brown color at 18 ° C, and a blue color at 22 ° C or higher. The existing ink which is specially designed as a step by 2 °C can be selected from the temperature range of -10 ° C - 60 ° C for the purpose.
3. Printing method
The printing material for printing is preferably water-absorptive paper or synthetic paper. The printing method can be combined by offset printing, gravure printing, screen printing or two printing methods. When printing with a special liquid crystal ink, the characters and images are printed by offset printing or gravure printing, and then the ink sealed in the liquid crystal capsule is printed. It is necessary to pay attention to the fact that the capsule cannot be damaged, so most of the printing is performed by screen printing.
Liquid crystals are inherently colorless and transparent, and exhibit a variety of colors by means of light of a specific wavelength. For this reason, it is necessary to print the base of the printed liquid crystal portion in black.
In addition, since the liquid crystal ink is very wet, after the printing is completed, a transparent polypropylene film is kneaded on the surface thereof with an adhesive for moisture prevention. The surface processing of this laminated polypropylene film is performed in accordance with the needs and objectives of the visible pattern.
4. Use
In addition to electrical precision components and watches, the life of liquid crystals is generally about 1-2 years. The future research topic is how to extend its life.
Today, liquid crystal printing has a wide range of uses, such as printed display panels, toys, trademarks, simple body temperature belts, and health care appliances.
Here are two examples:
To print a simple body temperature belt, it is necessary to use irreversible ink to print. In some hospitals in the United States, it takes two cents to wipe the alcohol by a thermometer, but it takes only 5 cents to tear a piece of liquid crystal temperature measuring tape, and this temperature measurement The tape is placed in the mouth and can be taken out in only 5 seconds. It is fast and convenient to judge the temperature of the body according to the discoloration on the tape.
Another very famous example is the use of a relaxation card that measures the wideness of the human body. This is a tool for health care. According to people's psychological state, the blood circulation will change. If it is psychologically stressed, the fingers will be cold, and once relaxed, it will become warm. Using this principle, the finger touches the place where the temperature sensitive liquid crystal printing is printed, and the body temperature of the fingertip is detected, so that the degree of tension of the person can be easily detected, which is indeed added to the living environment by the printing process. An interesting and quick test method.