Xiang Jie and several rotary screen plate-making summary notes - rotary screen, plate-making - silk

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1 Introduction Modern rotary screen ink, spray wax film chip network and the traditional system of networks are related to sensitive technology. In the application of rotary screen Photographic Equipment and Sensitive adhesive Products, although manufacturers will provide the relevant exposure parameters, but in many cases, because of the many variables affecting the exposure is correct. These changes from the age of the light source, spectrum and distance; photosensitivity of photosensitive materials and dosage; layer thickness; environmental factors such as temperature and humidity. In practice, in order to get a satisfactory system of rotary fence to get high-quality Printing Correctly grasp the photographic process is very important.

2 the relationship between exposure time and light
2.1 Exposure time Rotary exposure related to degree of exposure of sensitive issues. In the plate making process, excessive exposure will Sensitive adhesive Over-sensitized, film production hardening, the formation of light-sensitive area expansion is not worse, not easy to wash, resulting in patterns not easily seen; underexposed photoresist sensitivity degree would not, film was soft, easy to wash away, causing flowers appear trachoma, serrated, serious film will fall off. In short, to master the correct exposure time is very important to process photographic process, it is associated exposure light source and photosensitizer.

2.2 Exposure light source Exposure light source is in the process of exposure can cause photosensitive proofing layer in a relatively short period of time a chemical and physical changes of light. Select the appropriate light source, can reduce the exposure time, speed up the plate-making speed, improve plate quality. Rotary light sensitive adhesive cross-linking reaction mainly occurred after the absorption of ultraviolet light, using light sources are ultraviolet light exposure, their spectral characteristics and intensity of a direct effect on the relationship between plate. Therefore, when considering the choice of light and photosensitive materials used to match the absorption wavelength in order to obtain good results. Rotary photosensitive materials on the 300 ~ 400nm wavelength range of UV-sensitive, in which the output wavelength of the light source rich with high-pressure mercury lamp, iodine gallium lamp. These two types of light wavelengths produced by rotary photosensitive material with a more consistent absorption wavelengths, light can play in the plate efficiency of the higher light-sensitive, so sensitive adhesive in the light irradiation produced within a short time curing.

2.2.1 high-pressure mercury lamp
Fired high pressure mercury lamp spectrum, the maximum emission peak concentration in the UV region to 365nm Department to peak, and rotary screen photosensitive materials was close to the absorption wavelength of 355nm, light energy, high efficiency, low emissivity, is the production of round ideal source web plate.

2.2.2 iodine gallium lamp
Iodine gallium light wavelength distribution in the wavelength range 350 ~ 450nm to 417nm as the highest office. In the 400 ~ 350nm there are two peaks, which for most printing down the photosensitive photosensitive material is effective. This light is stronger UV emission, high luminous efficiency, but high radiant heat, started a long time.

As the light source spectral characteristics and the energy intensity of sensitization meet requirements rotary screen plate, the key this two light sensitive plate for rotary screen exposure light.

2.3 light attenuation and strength
Exposure light source used in the average effective life of 500 ~ 1000h. In everyday use, the amount of light will occur over time decay, resulting in reduced amount of light. Therefore, the exposure time is not constant, such as the light source used for too long or more useful life, you will need to extend the exposure time or for a new light.

In addition, the light intensity on the system network will also be affected. Light reach the film surface energy network that is sensitive materials obtained by the surface radiation intensity. Intensity of such radiation is not the eyes see light intensity, because the UV is not visible, when light reaches the fixed distance between the photosensitive surface, the higher the light source intensity, the shorter the exposure time; light irradiation intensity of lower The longer the exposure.

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