Aroma printing and liquid crystal printing

First, the aroma printing

The key to this printing method is to seal the perfume in the capsule and then incorporate the ink as required.

1, to resort to the smell of printing

When you talk about printing, you always think that you are looking at your eyes. In fact, it is indeed relying on the visual, but the reality has changed, and it is not yet able to resort to the printing of the sense of smell. This is called the method of microcentric printing. You can print prints that show a variety of flavors such as foods, flowers, etc., such as gift cards, New Year's cards, magazines, pictures, etc. For example, if a flower photo is printed on a product catalog, the reader wipes the flowers with the nails. The scent of the flowers is emitted; if the apple is on the tablet, the fragrance of the apple is emitted after the rubbing.

In fact, this kind of printing method is not difficult to understand, is to work hard in the ink, first all kinds of spices into capsules, mixed with the ink to be used, according to the content of the screen selected ink to print on the line. For the printing surface, use a fingernail or a coin to wipe the printed image, break the capsule in the ink, seal it in a broken capsule, and allow the perfume enclosed in the capsule to fly out and temporarily float in the air. This fragrance smell has a longer retention time in prints.

2. Impression caused by the color and scent

The fragrance ink that can print a fragrance is transparent. Throughout the printing process, the colors and graphics on the screen must be associative with the scent. After printing the bottom image with offset printing, screen printing and perfume ink are used to print the scent of flowers or food, usually This two-step process to India, the effect is very good.

The reason for using silk screen printing is to avoid damage to the capsules in the fragrance ink, and because the screen printing ink film thickness is about 20 times higher than that of offset printing, which facilitates the long-term retention of fragrance, but recently it has been developed exclusively for offset printing. The special ink. For example, a general offset press can be used. That is, a five-color machine or a six-color machine prints CMYK and other colors out of the base image and the scented ink at one time. At this time also pay special attention not to damage the capsules in the perfume ink.

It is also necessary for the ink manufacturers to draw their attention to the fact that the method of manufacturing inks should be changed accordingly due to the characteristics of the printing methods. As long as the durability of the fragrance ink is long, if it is printed using screen printing ink, it can be stored for about 10 or so. If you use offset ink to print, you can probably keep it for six months to a year.

3, the types of spices

Fruity: green apple, cherry, blueberry, strawberry, watermelon, guarana, orange, pineapple, grapefruit, grape, banana, apple, grape juice, peach, lemon.

Flowers and herbs: artichokes, cosmos, camellia, amaranth, cherry blossom, orange blossom, amaryllis, camellia, rose, calamus, purple, wild rose, plum, primrose, hyacinth, orchid, jasmine, rattan, yuca, Reeds, daffodils, mother chrysanthemums, daffodils, primroses, carnations, lily of the valley, lilacs, chrysanthemums, violets, lavender, osmanthus, dahlias, gentian, gardenia, tulips, lilies.

Beverages and foods: whiskey, cocoa tea, mustard, curry, coconut, pine mill, garlic, pepper, tea, toffee, cola, mayonnaise, lemon tea, coffee, vanilla, milk tea, chocolate, peanuts.

Others: Mist, mosquito coils, forests, cedar tea, coriander, cinnamon, mint, sage, white sand, soap, pine.

Second, liquid crystal printing

The printing principle is the same as the above-mentioned scent printing. The liquid crystal is encapsulated and then incorporated into the printing ink for printing.

1, LCD is how it matters

Liquid crystals are substances that have liquid flowability and have the same optical properties as crystals. Usually, cholesteric liquid crystals are used. The appearance of this liquid crystal is transparent liquid. The amount of the liquid crystal blended in the ink is 40% of the total ink amount, and the ink film thickness is about 30-60μ. Printed products vary according to needs, with reversible reactions and irreversible reactions.

2. Ink color changes with temperature.

Liquid crystal printing is actually a kind of special printing technology that uses temperature to change the printing ink. First of all, it is necessary to make capsules of liquid crystals with characteristics that can change the color of the ink, then wrap them with gelatin and then incorporate them into the ink to make a special ink for liquid crystal printing.

The color change of the liquid crystal is changed with the temperature, and can be changed to 4-7 colors. The general color change sequence is changed 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 a liquid crystal for use at 20° C. is used, green color appears at 20° C., and brown color at 18° C., and becomes blue color at 22° C. or higher. The existing ink is calculated as a single-step differential at 2°C, and the temperature range from -10°C to 60°C can be selected for the viewing purpose.

3, printing method

The printing material for printing is preferably a water-absorbent paper or a synthetic paper. The printing method uses offset printing, gravure printing, screen printing or a combination of two printing methods. When printing with a special liquid crystal ink, the characters and images are first 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, and thus most of the printing is performed by screen printing.

The liquid crystal is inherently colorless and transparent, and exhibits various colors with the light of a specific wavelength. For this purpose, the base of the printed liquid crystal portion must be printed in black.

In addition, because the liquid crystal ink is very afraid of moisture, after the printing is completed, a transparent polypropylene film is glued on the surface with an adhesive for moisture protection. The surface processing of this laminated polypropylene film can be performed with the need and purpose of the visible pattern.

4, use

In addition to the precision components and watches used in electrical appliances, the life of liquid crystals is generally about 1-2 years. The future research topic is how to extend its life.

Today, the use of liquid crystal printing has become very widespread and can be used to print display panels, toys, trademarks, simple temperature zones, and health care devices.

Here are two examples:

Printing a simple body temperature zone requires the use of irreversible ink to print, some US hospitals use the body temperature table to wipe one alcohol to pay two cents, but tearing a piece of liquid crystal temperature measuring tape requires only 5 cents, and this kind of temperature measurement The tape is put into the mouth and can be removed in just 5 seconds. The body temperature can be judged according to the discoloration on the tape, which is fast and convenient.

Another very famous example is that it is used as a loose card to measure the body's wide comfort. This is a tool for health care. According to people's psychological state, the blood circulation will change. If it is psychological, fingers cold, once loose, it will become warm. Using this principle, let the finger touch the printed area where the temperature sensitive liquid crystal is printed. When the body temperature of the fingertip is detected, the tension of the person can be easily measured. This is indeed the use of a printing process to add both to the living environment. Fun and quick test results.