KR940011445B1 - Method of processing low reflexibility of glass product - Google Patents

Abstract

The method comprises; (i) heavy grinding to control a curve ratio of glass surface; (ii) percussing to recompose the potential crack of glass surface; and (iii) strong corroding with low concentration corrosive solution of fluorine acid system consisting of 15-25 wt.% HF, 1-3 wt.% HBF4, 6-15 wt.% glycerol and 50-77 wt.% H2O to prevent appearance of projections on glass surface. The low reflection glass is used for front glass of Braun tube for television or monitor for computer.

Description

Low reflection processing method of glass products

The present invention relates to a low reflection processing method of glass products, and more specifically to the color T.V. By eliminating the total reflection of the CRT front glass of the receiver and the monitor glass of the computer monitor, it is possible to reduce the eye fatigue caused by glare and to allow the operator to easily read the information characters or symbols displayed on the monitor. It relates to a processing method for imparting a low reflection function.

Generally used T.V. The front glass of the receiver and the computer monitor has a problem in that the surface of the front glass is specular so that when the external light is reflected from the surface, the image on the screen is hardly seen or the eyes of the viewer and the operator are increased due to glare. Therefore, conventionally, as a method for eliminating this problem, there is a method of corroding the surface of the glass to make uniform fine unevenness or coating the uneven film on the surface, but these methods can reduce external light rays. Although there are many problems in providing a resolution capable of projecting the details of the displayed image.

Therefore, the inventors of the present invention, as a pretreatment process, deeply ground the surface of a glass product with a garnet to adjust the surface curvature so as not to have a molding defect, and percussing with permis to reconstruct a latent crack of the surface, which is then HF 15-. Low concentration of HF-HBF type ₄ corrosion solution composed of 25wt%, HBF ₄ 1-3wt%, glycerol 6-15wt%, H ₂ O 50-77wt%, so that there is no protrusion due to rapid glass surface corrosion The thin concave-convex irregularities were formed uniformly in a honeycomb to obtain a glass product having a low reflection performance and a resolution superior to that of the conventional method.

In addition, the size of the concave-convex formed by the corrosion solution is about 0.5-1.0 ㎛ depth, 15-20 ㎛ in diameter to properly scatter the light shows a glossiness 50-70 degrees suitable for the low reflection surface. In general, the composition of CRT glass for color TV receivers is different from that of CRT glass for general black and white TV receivers, which is SiO ₂ 64-66 wt%, Na ₂ O 7-9 wt%, K ₂ O 5-7 wt%, BaO 4-6 wt Corrosion solution because it consists of%, SrO 8-10wt%, Sb ₂ O ₃ 0.3-0.5wt%, Li ₂ O 0.4-0.6wt%, Al ₂ O ₃ 1-3wt%, CaO 1.5-2.5wt% The reaction to is significantly more rapid than CRT glass for black and white TV receivers, so the control of solution composition is essential.

Such a collar T.V. When chemically polishing CRT glass for a water phase with a high concentration of the corrosion solution used in the conventional method, the rapid progress of dissolution occurs due to the speed difference in which various oxide components in the glass composition are eroded and dissolved in the corrosion solution. Defects will increase in large quantities.

Therefore, in the present invention, a low-concentration corrosion solution is used during the chemical polishing process. By suppressing the solubility difference of each composition component of the CRT front glass, the leveling effect was sufficiently provided to completely eliminate the occurrence of projection defects.

The surface faced by the above-mentioned garnet lapping is permised and the surface is readjusted to produce fine and latent cracks, and the latent cracked glass surface is thinly concave by chemical polishing using a low concentration of corrosion solution. Since irregularities are formed, light scattering can obtain a suitable low reflection surface.

The present invention is explained in more detail in the following examples.

Example 1

The color TV receiver CRT glass specimen composed of the above-mentioned composition was ground to a depth of about 0.2 mm with a garnet to eliminate molding defects and to adjust the surface curvature, using a lapping machine to perper with a particle size of 100 μm or less. Cushing forms a potential even track on the surface, and then washes the glass surface to remove perm attached to the surface, HF 18.6 wt%, HBF ₄ 1.5 wt%, glycerol 6.7 wt% and H ₂ O 73.2 wt% Chemical polishing was performed with a low concentration of the corrosion solution.

The chemical polishing machine had a head speed of 1-2 m / sec, a solution temperature of 41 ° C., and a treatment time of 3.5 minutes, so that scattered light having a gloss of about 54 and roughness of 0.75 μm was smooth and a low reflection surface with excellent resolution was obtained.

Example 2-3

In this example, the composition of the corrosion solution, the temperature of the solution, and the treatment time were changed in the same manner as in Example 1.

The conditions and results are shown in Table 1.

TABLE 1

Solution temperature (℃) 38 40

Processing time (minutes) 3.5 3.0

Glossiness 58 63

Roughness (μm) 0.51 0.49

As described above, the processing method according to the present invention eliminates surface stains, streaks, and the like, which are the biggest problems in the conventional corrosion treatment method, thereby significantly improving productivity, and rapidly causing corrosion of the glass surface due to differences in glass hardness. Forming uniform unevenness without the occurrence of projections by the soft light scattering of the external light has a feature that can provide a low reflection processed glass products excellent in appearance and resolution.

Claims (1)

The surface curvature is adjusted by deep grinding and percussed to reconstruct the surface cracks, and then the hydrofluoric acid low concentration consisting of HF 15-25wt%, HBF ₄ 1-3wt%, glycerol 6-15wt%, H ₂ O 50-77wt% A low reflection processing method for a glass product, characterized by using a corrosion solution to suppress the occurrence of projections on the glass surface due to rapid corrosion.