UV ink storage and environmental requirements

UV ink

Before the ink is used, it is necessary to fully stir the ink. Before use, it is necessary to stir the ink thoroughly. This is the basic principle for the use of the ink. This is because the specific gravity of the resins, solvents, pigments, and additives in the ink is different, and the delamination phenomenon inevitably occurs after the ink has been placed for a while. If it is not fully stirred before use, the lighter weight components will precipitate on the upper layer and the components with higher specific gravity will precipitate. As a result, the quality of the inks often reacted by the customer will be unstable, and the hiding power and adhesion of the ink used before and after will be different.

Placing for 24 hours after printing will deepen the curing effect and various resistances.

UV curing consists of surface curing, inner curing, deep curing, and complete curing from the physical point of view. Most of the UV inks in the printing process are only cured in the inner layer because the UV rays form a neodymium film on the surface of the printing surface at the instant that the UV rays do not penetrate the inner layer of the ink in a short time. Failure to achieve a deep photo-curing effect has failed to achieve the best adhesion of the ink. After 24 hours of static printing, it will deepen the curing effect and various resistances, which will make the adhesion effect the best.

After the deployment of the ink must be used the same day, so as to avoid pollution, affect the quality of screen printing, thus affecting the adhesion.

Part of the color ink is generally inferior in adhesion to the original basic color because of the combination of multiple pigments in the ink, which affects the absorption of ultraviolet light.

Special white ink has worse adhesion performance than ordinary white ink because of its relatively large amount of toner and large frictional resistance, and because of its relatively low relative adhesion of toner, it is not as good as ordinary white, and it is relatively difficult to be cured by light.

Colored inks have poor adhesion compared to white, so their wear resistance is also relatively poor. Since the color toner has a large amount of pigment, it is often difficult to achieve a deep-curing effect when ultraviolet rays pass through. Therefore, in the case of enamel, the adhesiveness of the pigment is poorer than that of the mono-anthraquinone, and the abrasion resistance is also deteriorated. Therefore, if a high abrasion resistance coefficient is required for the part of the toner, only by enhancing the intensity of ultraviolet light reception can the effect of deep curing be achieved, so as to increase the adhesion.

UV inks see light reactive UV inks should avoid direct sunlight when printing, and do not approach fluorescent and mercury lamps.

Six ink storage

The UV ink is stored in a dark room at 22 °C -25 °C without storage for 1 year and a half to 2 years. After opening the jar, tighten the bottle cap and store at 22 °C -25 °C. The storage time is half a year. Please note that after opening the ink, do not allow water to spill into the bottle.

Seven printing shop environmental requirements

Because UV inks are UV light inks, and sunlight contains UV light, it is recommended that indoor sunlight should not be too bright in the UV ink printing room. For example, if the light is too bright, please install curtains to block the light. For example, there are more fluorescent lamps in the printing room. , Please note that the appearance of the silver lamp off the surface of the sun caused by ultraviolet light transmission, indoor light is too strong and ultraviolet light transmission of the fluorescent lamp will cause the UV ink in the printing process on the screen plate curing, thus blocking the screen. (In the production line where the sunlight is too bright

Pay special attention to the production line by the side of the window, and please promptly recall the UV ink on the screen after printing to avoid solidification).

Control the temperature and humidity of the workshop

If the temperature is low and the humidity is high, the photocuring reaction of the UV ink is slow and the binding ability between the ink and the substrate is reduced. Therefore, the ambient temperature and humidity of the workshop must be controlled during UV printing. The temperature is about 18°C ​​to 25°C, and the relative humidity is about 50% to 65%.

Summary: As long as you choose the right system solution and pay attention to the frequently occurring problems before printing, printing, and printing, and avoid problems, bottle printing is not a very difficult task. Shenzhen Jinjia Ink can solve the technical problems in the bottle printing process at any time and provide thoughtful technical services and solutions!