1. Fragrance printing
The key to this printing method is to encapsulate the fragrance in a capsule and then incorporate the ink as needed.
1. Recourse to olfactory printing
Speaking of printing, it is always an impression that you look at it with your eyes. In fact, it is indeed based on vision, but reality has changed and it has not been possible to resort to olfactory printing. This is the method called scent printing (microcent). You can print prints that show various fragrances such as food and flowers, such as gift cards, New Year's cards, magazines, and picture albums. For example, if you print a photo of a flower on a product catalog, the reader rubs the flower with your fingernails It emits the fragrance of flowers; if it is an apple on the slice, it will smell of apple after rubbing.
In fact, this printing method is not difficult to understand. It is to work hard on the ink, first make all kinds of spices into capsules, mix it with the ink to be used, and select the ink to print according to the content of the screen. Aiming at the printing surface, rub the printed screen with nails or coins to rupture the capsule in the ink, rupture the capsule, and the fragrance enclosed in the capsule will fly out and temporarily float in the air. This fragrance smell has a longer retention period in prints.
2. The impression caused by the color and fragrance is just right
The spice ink that can print fragrance is transparent. The entire printing process is that the color and graphics on the screen must be associated with the fragrance. When the base image is printed with offset printing, silk screen printing and spice ink are used to print the fragrance parts such as flowers or food, usually always Printed in such a two-step process, the effect is very good.
The reason for using screen printing to avoid damage to the capsules in the fragrance ink, and because the thickness of the screen printing ink film is about 20 times higher than that of offset printing, this is convenient for the long-term retention of fragrance, but recently it has been developed specifically for offset printing Special ink. For example, a general offset press can be used. That is, the five-color machine or the six-color machine will print out the base map and the part with fragrance ink in CMYK and other colors at once. At this time, special care should be taken not to damage the capsules in the fragrance ink.
Attention should also be drawn to ink manufacturers, due to the characteristics of the printing method, the method of manufacturing ink should also be changed accordingly. How long is the durability of the spice ink. If you use screen printing ink to print, it can be saved for about 10, and it will have a fragrance when rubbed at any time. If the ink used for offset printing is used, it may be retained for half a year to a year.
3. Types of spices
Fruity flavors: green apple, cherry, blue berry, strawberry, watermelon, white melon, orange, pineapple, grapefruit, grape, banana, apple, grape juice, peach, lemon.
Flowers and plants: Acacia, cosmos, camellia, thistle, cherry blossom, orange blossom, amaryllis, camellia, rose, calamus, purple flower, wild rose, plum, primrose, hyacinth, orchid, jasmine, vine, sage grass, Sagebrush, narcissus, matricaria, narcissus, primrose, carnation, lily of the valley, lilac, chrysanthemum, violet, lavender, osmanthus, dahlia, gentian, gardenia, tulip, lily.
Drinks and food: whiskey, cocoa tea, mustard, curry, coconut, pine umbrella mill, garlic, pepper, powdered tea, toffee, cola, mayonnaise, lemon tea, coffee, vanilla, milk tea, chocolate, peanuts.
Others: mist, mosquito coil, forest, cedar musk tea, cypress, cinnamon, mint, sage, white sandalwood, soap, pine. [next]
2. LCD printing
This printing principle is the same as the fragrance printing mentioned above, which is to encapsulate the liquid crystal and mix it with printing ink for printing.
1. What's wrong with LCD
Liquid crystal is a substance that has liquid fluidity and has the same optical properties as crystal, and usually uses cholesteric liquid crystal. The appearance of this liquid crystal is transparent liquid. The amount of liquid crystal blended in the ink is 40% of the total amount of ink, and the thickness of the ink film is about 30-60μ. Printed products are divided into reversible and irreversible reactions according to different needs.
2. The printing color changes with temperature
Liquid crystal printing is actually a special printing technology that uses temperature to promote color changes. First, the liquid crystal with such characteristics that can change the printing color is made into a capsule, then wrapped with gelatin, and then mixed into the ink to make a special ink for LCD printing.
The color change of the liquid crystal changes according to the temperature, and it can change 4-7 colors. The general color change sequence is in the order of ink → tea → blue. When the liquid crystal is green, it refers to the standard temperature of the liquid crystal. For example, when using liquid crystals at 20 ° C, they appear green at 20 ° C, brown at 18 ° C, and turn blue at 22 ° C or higher. Existing 2 ° C is counted as a special grade of ink, which can be selected from the temperature range of -10 ° C-60 ° C depending on the purpose.
3. Printing method
The printing material used for printing is preferably water-absorbent paper or synthetic paper. The printing method can be offset printing, gravure printing, screen printing or a combination of two printing methods. When printing with special liquid crystal ink, the text and image are printed by offset printing or gravure printing, and then the ink enclosed in the liquid crystal capsule is printed. Pay attention to not damage the capsule, so most of them use screen printing for printing.
The liquid crystal is originally colorless and transparent, and it exhibits various colors with the help of light of a specific wavelength. For this reason, the background of the printed liquid crystal part must be printed in black.
In addition, because the liquid crystal ink is very resistant to moisture, after the printing is completed, a transparent polypropylene film is mounted on the surface with an adhesive to prevent moisture. The surface processing of this laminated polypropylene film can be performed according to the needs and purpose of the pattern.
4. Purpose
In addition to electrical precision components and watches, the life of liquid crystal is generally about 1-2 years. The future research topic is how to extend its life.
Today, the use of LCD printing is very wide, it can be used to print display panels, toys, trademarks, simple temperature zones and health appliances.
Here are two examples:
Printing a simple temperature band requires printing with irreversible reaction ink. Some hospitals in the United States use a thermometer to wipe alcohol once to pay a dime, but it takes only 5 cents to tear a piece of LCD temperature measurement paper tape. The paper tape is put into the mouth and can be taken out in only 5 seconds. According to the color change on the paper tape to judge the body temperature, it is fast and convenient.
To give another very famous example, it is used as a relaxation card for measuring the wide relaxation of the human body. This is a tool for health care. According to people's mental state, blood circulation will change. If it is psychologically tense, the fingers will be cold, and once it relaxes, it will become warm. Using this principle, let the finger touch the place where the temperature sensitive LCD printing is printed, and detect the body temperature of the fingertip, you can easily measure the tension of the person. This is indeed the addition of the printing process to the living environment. An interesting and quick test method.
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