Adhesion method for inner-layer glass of DLP screen

Abstract

The invention discloses an adhesion method for inner-layer glass of a DLP screen. According to the method, firstly, a UV adhesive, which has high light transmittance and is easy to wash with alcohol, is adopted as a primary positioning adhesive to block a gap between the bottom surface of the inner-layer glass and the upper end surface of a screen frame, so that the problem that a hot melt adhesive permeates into the screen frame is effectively solved, and the phenomenon that a non-transparent hot melt adhesive permeates into the screen frame to cause an optical black seam during follow-up hot melt adhesive application is prevented; and then a 3M hot melt adhesive is adopted as a main adhesive, and the 3M hot melt adhesive has high adhesion strength and realizes reliable adhesion and zero optical black seam between the screen frame and the inner-layer glass. According to the method, the adhesion of the inner-layer glass of the DLP screen is finished so long as the 3M hot melt adhesive injected into four long grooves is cured initially, the DLP screen can be carried arbitrarily without an adhesive failure before the 3M hot melt adhesive is cured completely (over 24 hours), the shock resistance is good, the curing of the hot melt adhesive cannot be affected, the defect of long curing time of the existing glass adhesive is overcome, and the production and manufacturing efficiency of finished screens is greatly improved.

Description

technical field [0001] The invention relates to the field of making DLP rear projection splicing screens, in particular to a method for bonding inner glass of a DLP screen. Background technique [0002] The screen of DLP rear projection splicing screen is mainly composed of screen frame, inner glass, Fresnel lens and imaging screen. The surface is flat, the Fresnel lens is used for concentrating light, and the imaging screen is used for imaging. After the above-mentioned components are assembled by different bonding processes, the finished screen is made. The size of the screen frame is the same as that of the inner glass. The bonding and fixing of the screen frame and the inner glass is one of the important processes, which requires high bonding strength. The thinner the thickness, the better, but even if the total thickness is thinner, there will be optical black seams and material black edges. At present, the bonding and fixing of the screen frame and the inner glass ma...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is: since the glass glue layer is only 0.2-0.3mm thick, the bonding strength is obviously not enough, and an optical black seam of more than 0.375mm is produced on each side of the inner glass (PC sheet thickness 0.175mm+ glue layer thickness), and because Glass glue takes a long time to cure (about 24 hours) and cannot move during the curing process. Therefore, this bonding technology is time-consuming and inefficient, which is not conducive to mass production

The disadvantage of this technology is that the width of the upper end surface of the screen frame is generally only about 1 mm, and the bonding area is small. Although the bonding strength of UV glue is higher than that of glass glue, the glue layer is relatively brittle after UV glue bonding. If the finished product The screen is shaken too much during transportation, and the adhesive layer is more likely to be broken and degummed

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