Self-adhesive label paper is a type of self-adhesive label material that is often used in daily life, but do you know the special ink pigments used for printing self-adhesive? Today, the editor will explain to you the special ink pigments used in special label processing.
reverse varnish
Reverse varnish is a special ink that is more commonly used in recent years. The so-called reverse varnish is actually two kinds: one is top oil and the other is base oil. After the two kinds of varnishes are printed on the surface of the substrate at the same time, a chemical reaction will occur to form a grainy effect. Depending on the formulation of the varnish, the resulting particle size and feel will vary. Therefore, we need to choose the appropriate reverse varnish according to the requirements of customers. Reverse varnish can not only produce a matte-like texture on the surface of printed matter, but also has the waterproof function of traditional varnish. Because the cost of reverse varnish is not high, coupled with its particularity, it is welcomed by the majority of end users and its application is becoming more and more extensive. At present, this ink is already a variety of ink between special inks and conventional inks.
Tactile Ink
The tactile ink will automatically bulge after printing, and people will have an obvious tactile sensation when touching the label products printed with this ink. There are many types of tactile inks, which can be divided into glossy and matte tactile inks according to the gloss of the inks; according to the drying method, they can be divided into UV and water-based dry tactile inks. Among them, the tactile ink after UV drying is relatively hard after drying, and the tactile feeling is relatively obvious. The tactile ink after water-based drying is relatively soft after drying, which is suitable for some specially designed products. For example, if there are raindrops on some product patterns, Then this kind of ink can be used to make the raindrops more three-dimensional and tactile. In addition, tactile inks are also frequently used for braille pattern printing.
metallic ink
In self-adhesive labels, metal effects are widely used, especially on some high-end cosmetics and wine labels, the application of metal effects is particularly common. If the label wants to show a metallic effect, the traditional process is generally to use aluminum foil paper for printing on self-adhesive materials. However, due to the high cost of this method, many printing companies have begun to try to use metallic effect ink on coated paper instead. Aluminum foil paper self-adhesive material printing. It has to be said that the metallic luster shown by metallic effect ink printed on coated paper is much worse than that printed on aluminum foil paper self-adhesive material, and the replacement effect is not ideal. So, is there a better solution?
In fact, there is a kind of ink on the market that presents a metallic texture, usually gold, silver, etc. Metallic inks are often used when a metallic texture effect is required in label design, which is commonly used in the outer packaging labels of some food and industrial products. Compared with aluminum foil paper materials, metallic inks are cheaper and more cost-effective. At the same time, aluminum foil materials are more suitable for expressing large-area metal solid effects, while metallic inks are more suitable for expressing relatively complex pattern effects.
There are many types of metallic inks currently on the market, which can be classified into letterpress, flexo and gravure metallic inks according to the printing methods. Among them, gravure mirror metal ink has the best effect, and can even achieve the effect close to aluminum foil material or bronzing, but this kind of ink usually uses solvent as the carrier, and the environmental protection effect is not ideal; embossing and flexo metal ink are relatively environmentally friendly. But the printed metal effect is not as good as gravure metal ink.
Pearlescent ink
Containing pearlescent pigments of various diameters and colors, the ink will show a pearlescent effect after printing. The pattern printed with pearlescent ink will have pearlescent luster and a certain degree of color changing effect at different angles. This kind of ink is often used in the labels of daily chemical products and cosmetics. The purpose is to set off the characteristics of the products. For example, cosmetics such as pearl cream use pearlescent ink to print specific patterns on the labels, which will have a strong decorative effect.
Invisible ink is a special color developer added to the ink. This ink is colorless under normal light, but it will develop color under specific light. For example, some invisible inks develop color under ultraviolet rays, and some develop color under infrared rays. This kind of ink is mostly used in label anti-counterfeiting process. It can be used to print hidden marks. When it is necessary to identify the authenticity of the product, it will show invisible graphics and texts when irradiated with a special light source on the designated position of the label.
fluorescent ink
Refers to a kind of ink formulated with brightly colored fluorescent pigments. The printing effect of fluorescent ink is very bright and beautiful, and it is especially easy to attract attention. At present, the mainstream fluorescent inks on the market include embossing, flexo printing and screen printing fluorescent inks. Fluorescent inks are usually used in some cosmetic labels, warehouse logistics labels and hazard warning labels.
When this kind of ink is used for cosmetic labels, it can be combined with a special design so that people can find the product at a glance among many products, thereby attracting consumers' attention and exerting a good shelf effect; some warehouses often have limited lighting strips, If high-efficiency turnover is required, the staff must be able to find the corresponding goods as quickly as possible. The effect of the label printed with fluorescent ink is particularly eye-catching, and it can be easily identified even if it is pasted in a general light environment, so it can be used as warehouse goods. Storage labels; similarly, because the fluorescent ink is very eye-catching and has a strong reminder effect, it is often used to print hazard warning labels, mainly used to remind the placement of some dangerous goods and some dangerous positions on mechanical equipment. to a better warning effect.
Luminous Ink
Luminous ink refers to a kind of ink that adds fluorescent powder to the ink to make the ink absorb light energy in sunlight and store it, and then release light energy in a dark environment to continuously glow. Luminous inks come in a variety of colors, including yellow, blue, green, red, purple, etc. At the same time, luminous inks can be applied to various printing methods, such as screen printing, flexographic printing, etc. It should be noted that screen printing luminous ink is generally recommended. This is because the ink layer of screen printing is thicker, and the ink can absorb more light energy after printing, and can release more light energy in a dark environment. time will be longer
This kind of ink is often used on warning labels for escape routes, such as escape route guidance labels and emergency exit labels used in some movie theaters. Usually, the luminous pigment on this label will absorb the light energy in the environment and store it. In emergencies such as power outages, light can be used to guide people to escape.
In recent years, some cosmetics and wine products are also trying to use luminous inks. For example, the design of some wine labels is a bright moon, and the moon can be printed with luminous inks, so that the moon will shine in dark places. Great decorative effect.
scented ink
Added tiny capsules containing essence, the ink will produce fragrance after rubbing after printing, because the tiny capsules will be squeezed when rubbed to release the essence in the capsule. Scented inks have many scent types to choose from, the more common ones are fruit scent, flower scent, food scent and so on.
Most of the scented inks use flexographic printing. This kind of ink is also widely used in cosmetics, food, and wine labels. Customers can customize the scented inks they want from ink suppliers according to their needs, and then apply them It applies to product labels. Because scented inks can intuitively make consumers feel the taste attributes of products, printing labels with this ink can also get better experience and advertising effects.
Optically variable ink
Adding special light-sensitive pigments, after printing on the surface of the substrate, it can display different colors under different angles of light, and the common ones are red to purple, green to blue, etc. This kind of ink can be roughly divided into two categories: one needs to make a base color, and the other does not need a base color. The main difference between the two is that the former needs to print a black background on the substrate before printing, and then print the optical variable ink, while the latter does not. In addition, in terms of cost, the price of optically variable inks that require a base color is much cheaper than that of optically variable inks that do not require a base color.
The more common ones in life are the optically variable ink patterns on RMB. In the field of self-adhesive labels, optically variable ink is mainly used in anti-counterfeiting technology. A label equipped with optically variable ink can not only have a good anti-counterfeiting effect, but also have a strong decorative effect. At present, some red wine labels and high-grade product labels that the author knows will use optically variable inks.
Temperature change ink
Refers to the ink that can change color when the ambient temperature changes. Generally speaking, temperature-changing inks are divided into two types: reversible and irreversible. Among them, reversible temperature-changing inks mean that when the ambient temperature changes, the ink color also changes. Once the ambient temperature returns to the normal range, the ink color can also be restored. Ink of the original color; irreversible temperature-changing ink refers to the color of the ink that changes after the ambient temperature changes. Even if the ambient temperature returns to the normal range, the color of the ink cannot be restored to the original color of the ink. In addition, reversible temperature-changing inks are divided into high-temperature reversible temperature-changing inks and low-temperature reversible temperature-changing inks. High-temperature reversible temperature-changing inks mean that the color of the ink changes when the temperature rises. The color changes.
Generally speaking, temperature-changing inks have a temperature-changing critical point (that is, the temperature at which the ink begins to change color). When the temperature exceeds or falls below the critical point, the ink will gradually change color, and the process is a gradual process rather than a transient process. , such as a reversible temperature-changing ink itself is red, but when the ambient temperature reaches 60 ° C, the ink will become colorless.
For self-adhesive labels, relatively more irreversible temperature-changing inks are used. For example, some hospitals need to perform high-temperature disinfection treatment on medical supplies. In order to ensure that related items have indeed undergone high-temperature treatment, high-temperature labels are required. This kind of label is printed with irreversible temperature-changing ink. During the high-temperature treatment, the label will change from colorless to black, and it is irreversible. When the staff sees the discoloration of the label of the treated item, it can be determined that the item has undergone high-temperature disinfection. deal with.
Infrared laser ink
Infrared laser ink refers to the ink that is invisible under natural light and displays green or red under infrared light. With the help of the particularity of this ink, this ink is often used to print anti-counterfeiting patterns, that is, when it is necessary to verify the authenticity of the product, the surface of the label is illuminated by an infrared flashlight to display the corresponding anti-counterfeiting pattern.
laser marking ink
At present, most daily necessities often use printing, labeling, hot stamping shrink packaging and other production and processing methods to mark product information. After a long time, the labels are prone to problems such as blurred information and labels falling off, which brings inconvenience to users. Laser marking technology can save the printed label information for a long time. At present, we can often see laser marking information on the outer packaging of some electronic products, high-end cosmetics and devices, but if laser marking is used directly on some packaging, the effect is often not ideal. Laser marking inks are used.
The laser marking ink is white, and it will form a white color block printed on the surface of the substrate. When a beam of low-energy C02 laser irradiates the color block, the place irradiated by the laser will turn black, forming a preset image It is equivalent to printing information by laser on the base layer printed with special ink. The information printed by this process can be preserved for a long time without problems such as blurred information and label falling off.
Refractive ink
Refractive ink is also called light-changing ink, that is, the ink will change into different colors under different light angles. The most common one is the light-changing digital pattern on the RMB. Optical variable ink has many colors, and the color can be changed under different light angles, such as purple into green, blue into green, purple into red, etc.
Optically variable ink is mainly used in the field of anti-counterfeiting printing, and of course it is also used in the field of self-adhesive labels. For example, a high-end wine label uses optically variable ink that turns purple into green to print product badges. This design can not only play a role in anti-counterfeiting Function, but also can improve the grade of the product. Due to the particularity of optical variable ink, the color of ink produced by different ink manufacturers may be different, so the color of this ink is difficult to be imitated. In addition, some large users have signed agreements with ink manufacturers in order to ensure the anti-counterfeiting properties of products, which greatly increases the difficulty of product imitation.
liquid changing ink
The liquid-changing ink will change when it comes into contact with a specific liquid, such as changing from colorless to red when it encounters ammonia, and from colorless to orange when it encounters bleach. In addition, some liquid-changing inks will also change when they meet water. For example, they will dissolve and disappear after meeting water, or they will change from white to colorless and transparent after meeting water. Most of the liquid-changing inks are also used in anti-counterfeiting technology, and some liquid-changing inks that change when exposed to water are used to print some special labels, such as printing some patterns first, and then printing a layer of ink that changes from white to transparent when exposed to water Cover the pattern, so that the good print will show the hidden pattern under the ink after contact with water. It should be noted that this process is reversible. Once the water is evaporated, the ink will change from transparent to white again, covering the pattern under the ink again.
