In some industries, during the Skycolor UV printer printing production process, the UV ink is often not completely cured and the surface is sticky, which results in unsatisfactory printing results. How is this phenomenon caused? How to solve this phenomenon to ensure the print quality, here Skycolor big flatbed UV printer compiled the information for everyone to share briefly.
UV curing lamp light source power is not enough
UV2513 printer UV light curing has three elements:
1. The spectrum, that is, whether the light emitted by a light source such as a UV lamp is consistent with the absorption spectrum of a cured object.
2. Intensity, that is, whether the light emitted by the light source is sufficient to cause the photochemical reaction of the cured product. Due to the performance of different photosensitizers in different cured products (UV coating ink, glue), the light transmittance of the main agent and the dosage The sensation is also different, so the curing strength requirements are different.
3. Curing speed. If the curing speed is too fast, the curing cannot be completed, and if it is too slow, it will adversely affect the cured product. Such as cracked patterns, poor adhesion. The curing speed varies with different cured products.
The fast printing speed of Uv printers is also the cause of incomplete curing of UV inks and sticky surfaces. In this case, you can reduce the printing speed or increase the power of the light source.
UV curing light tube aging
UV lamps mainly refer to lamps that can emit ultraviolet rays. When they emit light, they are accompanied by high heat, because they not only excite ultraviolet rays, but also accompanied by infrared emission. The wavelength of light is concentrated around 365mm. The ratio of infrared rays depends on different qualities. The content of the lamp tube is different. Normal domestic UV lamps have about 30% ultraviolet light, while imported UV lamps have 40-50% content. At the same time, they have low heat generation and long service life, up to 2000 hours, while domestic UV lamps have only 1,000 hours. about.
As the electrode of the lamp is gradually decomposed, the inner wall of the lamp tube is deposited, and the transparency and transmittance of ultraviolet light are gradually weakened. Therefore, the lamp tube of the UV printer should be inspected regularly and the lamp tube replaced in time.
UV ink itself has a slow curing speed
Light curing refers to a certain photochemical reaction that occurs under the effective irradiation of ultraviolet rays such as UV inks or UV coatings, so that the cured product becomes liquid and solidifies to form a pattern. This process can add a light curing accelerator, reduce printing speed or find ink Supplier resolution.