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UV curing technology

UV curing the physical properties of materials used for curing substance is subject to drying their impact. Expected performance was, whether it is the protection of rubber, ink, or adhesive, will depend on the parameters of these tubes, design and control methods. UV light of the four key parameters are: 1.UV radiosity (or density) 2. Spectral distribution (nm) 3. Radiation levels (or UV energy) 4. Infrared radiation. Compared to the greatest degree of radiation, or radiation doses and different UV spectrum, ink and glue will protect the show very different characteristics. UV lamp to identify the different characteristics and they can be solidified with the optical properties of materials that match the capabilities, extends the UV curing as a fast, efficient production processes scope. There are many curing systems of optical and physical properties (except for the composition of its own outside) the impact of curing effect, resulting in the appearance of UV-curable material characteristics (performance) is different from mine.

 

     By curing the material characteristics of the efficiency of a UV lamp, decided to launch photon can enter to activate the light-curing material that may trigger molecular ease. UV curing decided photon - the molecular collisions. Optical elements that may trigger spread evenly through the material, but the photons are different. In addition to the characteristics of UV light source, the curing of the film was also the optical and thermal dynamics. They interact with the radiation energy of the curing process had a major impact. Absorption rate: energy is the material in a gradual increase in the thickness of absorbed into the role of wavelength. Near the surface to absorb more energy, means that deep-seated to be less energy. But this is a situation with the wavelength varies. The total spectral absorption rate, including all from the light triggers agent, single-molecule substances, gathered as well as additives in paint effects. Reflection and scattering: relative with the absorption of solar energy is more material (or in the material inside) to change direction; this is generally due to be solidified material matrix material and / or pigment caused. These factors reduce the arrival of deep UV energy, but improved in the reaction of the curing efficiency.

 

     Optical density: and absorption is similar to it by the "non-transparency" and film thickness of two factors; including the absorption and scattering of light dilution effect; with a separate figures to show that, rather than as the distribution of spectrum. Spreading: A thermal dynamics contain specific heat, conductivity and density; material "proliferation", the ability to accept heat; affected by the surface of a sudden the infrared energy to enter a result of film and substrate temperature. Infrared absorption rate: temperature on the curing reaction rate has a significant impact; although the reaction temperature rise of temperature, but from the UV radiation lamp (radiant IR) is the fundamental source of the surface of the heat (not from the surrounding air or the atmosphere of heat transmission). Excessive temperature curing process that affects an important limiting factor. Optical thickness of the coating and ink as a result of non-transparency or color strength is that we need the characteristics of this fact, ink and paint coating posed special problems. Adhesives are usually also provide a relatively thick films. Unlike a physical film thickness, its optical thickness is very important. When wearing light into or through a material, it is by reducing the Beer-Lambert to describe - in the upper film has not been absorbed nor reflected light to wear and sent to arrive at the bottom of film. The significance of spectral absorption of the absorbent material with the wavelength varies. Obviously, the short UV wavelengths (200 ~ 300nm) will be absorbed on the surface it is simply not the bottom. Generally speaking, the thickness of films was limited, for the matrix, cohesion is the most important features should be.

   Even light can trigger the agent will be sensitive to the wavelength of absorption of its energy, hence the wavelength of light to reach deep to be triggered by molecules. A light can trigger the application of agents to varnish coating, but may not be suitable for ink choice. For ink, corresponding to the longer wavelengths of light to trigger agent is a better choice. In addition to the physical thickness, the spectral absorption Another role is to optical thickness. A film can not be in a wavelength of its optical thickness is thick, while in another wavelength is thin. Even if the varnish coating short wavelength (200 ~ 300nm) of optical thickness is thicker inclined. When the products in the UV curing curing material can be included on a "transparent" material, its absorption of light energy will be impeded. This is a laminated law, lens bonding, medicines assembly and, of course, DVD bonding, the commonly used. Understand the "transparent" Spectral transmission properties of materials to choose them through the curing of the most effective spectrum is very important. Under normal circumstances, long-wavelength UV lamp selection, combined with long-wavelength light trigger agent, such as PC, through materials such as curing the key to success. Most of the important role of the wavelength of the UV curing contains two wavelengths at the same time the scope of work (if contains the IR, 3 post). Working on the surface of short wavelength, long-wavelength work in the deep ink or coating. This theorem is due to short wavelength is absorbed in the surface of the deep inaccessible results. The lack of short-wave exposure would lead to the surface tacky; longwave energy shortage will lead to undesirable adhesion. Each recipe and film thickness will be appropriate from a short, long-wavelength energy benefit rate.

 

     The most basic mercury in both the scope of the launch of energy, but it is in the short wavelength of a strong launch it particularly suitable for coatings and thin ink layer. High-absorbent material, such as adhesives and silk screen printing ink, their formula is more suitable for the use of long waves triggered by the long-wave curing agent. These materials are used for curing the tube, contains additives, as well as mercury, such long-wave UV light in the UV launch more. Long-wave radiation of these tubes are also a number of short-wave energy, thus sufficient to meet the surface of the curing. Many very special applications, such as a large number of which contain titanium dioxide pigment additive curing material, or need to pass through plastic or glass-curing, it is necessary to long-wave curing, because these materials almost completely impeded the short-wave. UV light curing characteristics of the parameters of the UV lamp performance, can be completely and accurately linked to four characteristics: UV spectral distribution, radiation, the radiation and infrared radiation.

 

     1. Spectral distribution of its emission wavelength lamp described as one of the functions of the radiation energy or reach the surface of the wavelength distribution of radiation energy. It related to the standardization of a common terminology to express. In order to show the distribution of UV energy, the energy spectrum can be merged into 10nm spectral bands to form a distribution table. This will allow the different contrast between UV lamps and more easy-spectral energy and power calculations. Lamp manufacturers have announced their spectral distribution of data products. Online testing using multi-band-ray detector in order to make spectral radiometric characterization or radiation levels. They passed on in a relatively narrow (20 ~ 60nm) of the band of radiation energy of the sample to obtain useful spectral distribution of the relative information. As different vendors ray detector structure is different compared to them so it is possible, but very difficult. Now there are no such standards in order to enable models to make comparisons between manufacturers.

   2.UV radiosity (Irradiance): radiosity is to reach the surface per unit area to the radiation power. Radiosity to watts per square centimeter or tile to ho said. It with the lamp output power, efficiency, reflection system as well as focusing distance to the surface varies. (It is the lamp and the characteristics of geometry, it has nothing to do with speed.) Directly under the UV lamp of high-strength, peak power Highlights reference to "peak Radiosity." Radiosity including all relevant power power, efficiency, radiation output, reflectivity, focused light bulb size and geometry factor. Can be solidified as a result of UV absorption properties of the material to reach the surface below the surface of light energy than less. In the curing conditions in these regions may be markedly different. Optical thickness of the material thickness (or high-absorbent, or the physical structure of thick, or both there's) may reduce the light efficiency, resulting in material curing deep inadequate. In ink or coating, the surface of a higher degree of radiation would provide a relatively high light energy sleep.

 

     Curing depth of more affected by radiation degrees rather than a longer exposure time (radiation levels). Degree of radiation for high-absorbency (high opacity) of the film is even more important. Allowing the use of high radiation degrees less light trigger agent. Photon density increased photon - light trigger collision, thus the compensation of optical trigger the reduction of concentration. This thicker coating will be effective, because the surface of light absorption and obstruction trigger the same wavelength of light to reach deep molecular trigger agent.

 

     Reaches the surface radiation 3.UV per unit area of radiation energy. Radiation levels that reach the surface of the total photon (and radiosity is the arrival rate). In any given light source, the radiation is inversely proportional to the volume and speed with exposure in direct proportion to the number. Amount of radiation is cumulative time radiosity to Joules per square centimeter or miliJoules that (Unfortunately, no relevant degree or spectral content of radiation for radiation measurement for the information, it is only by the cumulative exposure of surface energy. ) its significance is that it is the only includes the speed of the parameters and characteristics of the exposure time parameters appear. 4. Infrared radiation density: infrared radiation mainly by the UV source of quartz bubble emitted infrared energy. Infrared energy and UV energy to be collected together and focus on the work surface. The decision on the IR reflectivity and reflector efficiency. IR energy can be converted to radiation levels or radiometric units. But usually it is the surface temperature generated by the attention the important point. It may be harmful to the heat generated may also be useful. Combination of UV light to resolve the relationship between temperature and IR technology there are many. Can be divided into to reduce the launch of mobile transmission and control of heat. Launched to reduce through the use of small diameter of the bulb to achieve, because it is the surface of the regional launch hotquartz almost all the IR. Reduction of transmission through the use of color in the tube behind the reflector (cold mirror) to achieve; or in the tube with the target window between the use of color (hotmirror). Mobile reduce heat temperature of the target - but only in the IR has aroused after temperatures - can use the air-conditioning or heat-flow devices to control the movement of heat. IR energy absorption by the material itself - ink, coating or substrate. The pace of energy from the incident and the work of IR absorption of energy caused by the surface temperature have a significant impact. The sooner the process of being absorbed IR less energy, causing temperatures. Through improving efficiency to speed up the production process.

 

     - Translated from "TapeDisc" attached UV drying technology information 1. Most of the UV light that contains two types of UV wavelengths, the two wavelengths at the same time work. Short-wave work on the surface, long-wave role in ink or Lacquer deep. This is due to short-wave energy absorbed by the surface can not enter the deep. Lack of short-wave exposure will cause the surface tacky, and the inadequacy of long-wave energy could lead to attachment difficulties. 2.CD production of UV drying for two - namely, the protection of plastic printing ink drying and drying. a. the protection of plastic: the protection of plastic covering almost all through the jet - rotating (spinning) carried out this way. And then under UV exposure. Exposure of the way there are many types can be broadly grouped into: rotating or non-spin mode; Focus, focus or defocus the way. b. rotating the way: in this way is to DISC fixed for rotation in the UV lamp, and placing it in the face of Coke or defocus UV lights within a certain distance. Although the rotation seems to be a way of surface to provide uniform exposure DISC a good way, but not necessarily so. If the UV lamp in the focus of attention within or near, a strong light will pass through the center of CD. When the disc spins, the continued exposure of its center, while two received only short-term edge of the "flash according to (burst)" UV light. This can lead to the brink of drying well.

author: Chenbro electronic      Published at: 2008-6-19 0:41:21