When you open a scented greeting card sent by a friend, a tangy scent makes you feel warm and happy; when you pick up a perfume ad, you don't need to spray perfume, the picture will emit a scent; when you face a beautiful When the dazzling names and realistic pictures on the recipes are dazzling, you can smell the smell of the dish with a touch of your hand ...
In a general sense, printed matter conveys information to readers visually.
However, with the continuous development of science and technology, printing technology that resorts to smell has been produced. This is called scent printing (microcent). As an example to illustrate, if a photo of a flower is printed on a product catalog, and the reader rubs the flower with their fingernails, the fragrance of the flower will be emitted; if the picture shows an apple, the fragrance of the apple will be emitted after rubbing.
Fragrance printing, let the nose and eyes read together, the eyes see the color, the nose smells fragrant, the nose and eyes are happy together in the reading.
In fact, the scent printing method is not difficult to understand, mainly working on the ink, that is, using a special fragrance ink to print. Scented ink is actually a kind of microcapsule ink, it is a variety of different odor raw materials added to the microcapsule carrier and added to the ink, thereby forming a variety of different scent ink. The fragrance of the scented ink can be directly added to the ink and printed by letterpress or lithography, or it can be made into microcapsules first, then infiltrated into the ink, and screen printed. During the use of the printed matter, the printed surface is rubbed against the printed surface with nails or coins, so that the capsule in the ink is broken, and the fragrance enclosed in the capsule is scattered and temporarily floats in the air. This fragrance smell has a longer retention period in prints.
With the continuous development of technology, this printed product has now begun to penetrate into many fields, such as stamps, promotional products, anti-counterfeiting samples, educational books and so on. Recently, it has been used in scented pictures, scented flower cloths, scented pokers, special scented advertisements in restaurants, etc., all of which have achieved good results. At present, odor printing has been widely used in magazines, advertisements, postcards, greeting cards, calendars, cosmetics, food packaging and other prints that integrate visual and olfactory effects.
In fact, if the children's books are printed with scent ink, the organic combination of sight and smell can also increase children's reading interest. Liquid crystal ink is added to the scent printing, and the printed floral patterns will show different colors with the seasons. Touching with your hands will release the fragrance of various flowers and show the charm of scent printing.
The composition and principle of odor ink
The ink used for fragrance printing is composed of fragrance capsules, adhesives, pigments and other additives. The fragrance capsules are based on the principle of emulsification, dispersing the perfume core material as the oil phase in the aqueous phase of hydrophilic natural or synthetic polymer resins, such as gelatin, gum arabic, polyvinyl alcohol and other solvents. After stirring to disperse the whole system, through temperature changes, and change the pH value or add salt and formaldehyde, alum and other second polymers, polymerization reaction occurs at the interface of the water phase and the oil phase, the shell material is precipitated, dispersed and Adsorbed around the perfume droplet particles to form a shell, that is, a polymer film surrounding the surface of the oil droplets, which is usually called the wall material of the fragrance capsule. The fragrance is wrapped in a film, and the gel is cured to form a capsule, and finally a microcapsule containing fragrance is obtained. The diameter of the fragrance microcapsules is 10 μm to 30 μm, and the wall thickness is about 1 μm.
It is worth noting that because the fragrance microcapsules are very small, the diameter of 10μm ~ 30μm can ensure that the amount of contact and inhalation is very small when wiped by hand, and will not cause irritation to the skin and respiratory tract.
Selection of smell printing ink
The premise of printing with scent printing ink is that the printed image must be heavier in color and the printed image area should be larger, so that the surface of the paper can be printed with sufficient microcapsules to play the role of fragrance. Because the scent concentration of the scent print depends on how many scent microcapsules are printed on the print.
A better and more effective method is to apply a layer of oily polish with scented microcapsules on the surface of the printed product. The commonly used method is to coat the printed image with a printing unit. In the coating process, one must ensure a sufficient coating amount, and at the same time, there must be good powder spraying measures, otherwise, there will be problems such as smearing and adhesion of the printed matter caused by wet pressure drying in general oily glazing. . The amount of fragrance coating applied to paper prints can be easily checked visually, as long as the smoothness and glossiness of the varnish coating are carefully checked.
One of the prerequisites for odor printing is that ink suppliers must provide a range of additional services. First of all, the ink supplier must have rich practical experience in the printing process, and can designate a fragrance oil essence supplier, responsible for the microencapsulation of fragrance oil essence, and mix the microcapsules into printing ink, polish or dispersing paint; Secondly, the ink supplier is required to understand and be responsible for adjusting the viscosity of the ink to adapt it to the printing system used. In addition, after completing the above work, you must also carry out proofing verification on the printing press.
In fact, not every scented olein and every scent is suitable for making microcapsules, such as leather, chocolate or coffee smell is difficult to replicate. Suppliers of fragrance inks must conduct fragrance microencapsulation tests at the design stage of fragrance printing. In addition to the preliminary test on the printing machine dedicated for testing, the spot proofing must be carried out on the printing machine that will be used for fragrance printing. Otherwise, once the actual printing production is put into practice, if the printing effect does not meet the expected requirements, it will be Cause significant losses.
The taste of paper printing ink itself will affect the fragrance printing effect. Therefore, when performing fragrance printing, you should choose the ink with less taste, and test the paper and ink. In addition, the additives in the printing ink will change the expected fragrance of the printed product due to volatilization, so be careful when printing fragrance.
Screen printing is generally used
The reason for using screen printing to avoid damage to the capsules in the fragrance ink, and because the film thickness of the screen printing ink is about 20 times higher than that of offset printing, which facilitates the long-term retention of fragrance, but recently 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.
The pressure of the scented screen printing cannot be too great, and the suitable pressure can be found by trial printing. In the trial printing process, in addition to paying attention to whether the ink on the plate surface is even after the scraper scrapes, it is also necessary to observe whether the microcapsules are broken and whether there is fragrance floating out.
The drying temperature of the scented screen printing ink should not be too high, otherwise the microcapsules will break and cannot be dried with ultraviolet light. The ideal drying method is volatile drying. Properly increasing the drying temperature and increasing the air flow rate can increase the drying speed of the ink layer.
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