Film-coating device of fluorescent lamp tube

Abstract

The invention discloses a film-coating device of a fluorescent lamp tube, which comprises a pressure pot filled with protective film solution and a spray gun connected with a liquid outlet pipe of thepressure pot. In the invention, the protective film solution is changed into foggy granules by the spray gun, and then the foggy granules are sprayed on the inner surface of glass of the lamp tube toform an even protective film; the consumption amount of alumina solution is less, and the alumina solution is not easy for case-hardening at a tube mouth, thereby the product quality is improved.

Description

technical field [0001] The invention relates to a film coating device for fluorescent lamp tubes. Background technique [0002] With the compactness of fluorescent lamps, the development of high power and tube diameters T3 and T2, the load on the tube wall of the lamp tube is increasing. Because the light red lead glass used in the glass tube of the general compact fluorescent lamp has a high sodium content, the glass contains The sodium ions will precipitate out of the glass after long-term electron and ion impact, and recombine with electrons to form sodium atoms. These sodium atoms combine with mercury on the surface of the fluorescent powder to form black sodium amalgam, which leads to a decrease in the luminous efficiency of the fluorescent powder; at the same time, the compactness of the fluorescent lamp will increase the temperature of the discharged electrons, resulting in an increase in the proportion of short-wave ultraviolet 185nm short-wave ultraviolet radiation....

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Problems solved by technology

[0005] However, this coating method has the following disadvantages:

[0006] 1. The thickness of the coating layer is difficult to control. Too thin will not play the role of a protective film. Too thick will easily cause the film to warp and peel off, which will affect the yield of subsequent processes;

[0007] 2. Because the temperature of the glass tube and the temperature uniformity of the glass tube are not well grasped when the film is coated, many film spots will be found in the glass tube after the film is dried;

[0008] 3. If the amount of alumina solution is too large, it is easy to form conjunctiva at the outlet of the lamp tube, which is not conducive to cleaning and subsequent processing.

[0009] In short, it is difficult to obtain a uniform and transparent aluminum oxide film with the traditional coating process

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