Production method of PET (polyethylene terephthalate) protective film for manufacturing process of flat-panel display

Abstract

The invention discloses a production method of a PET (polyethylene terephthalate) protective film for a manufacturing process of a flat-panel display, which comprises the following steps: (1) under Grade 1000 dust-free environmental conditions, coating low-polarity pressure-sensitive adhesive (19-20 g / m<2> weight, 18-19 mu m dry layer thickness) on the upper surface of an optical-level PET protective film substrate with a coating machine provided with on-line bifacial cleaning rollers by using a transfer coating method, and drying by heating to 120 DEG C; (2) laminating release film: laminating a release film on the upper surface of the low-polarity pressure-sensitive adhesive, and winding up; and (3) cutting: cutting the formed PET protective film on a special cutting machine to obtain the PET protective film for a manufacturing process of a flat-panel display. The invention has the advantages of simple steps and high production efficiency; and the product has the characteristics of no shedding, no pollution, high temperature resistance and static resistance, can be easily stripped after being coated by vaporization without leaving adhesive residues, and can avoid damaging the glass mirror in the stripping process.

Description

technical field [0001] The invention relates to a production method of a PET protective film for a flat panel display manufacturing process. Background technique [0002] Flat-panel display technology is the basic technology of the information industry, and it is also an emerging technology in the ascendant in recent years. One of the two main structures of flat-panel displays is the glass substrate made of inorganic glass. The thickness of the glass substrate is becoming thinner and thinner, and the thickness of the thinnest glass substrate is only 0.4mm. This kind of glass substrate is made by cutting large-sized glass into small glass lenses of various shapes and sizes. made and sanded smooth all around. In addition, in order to eliminate the light refraction of the glass substrate and increase its light transmittance, it is necessary to evaporate a layer of ultra-thin metal on the glass lens locally, and in order to prevent damage to the cover of the glass lens and non-...

AI Technical Summary

Problems solved by technology

[0003] The traditional protective film uses ordinary PP film. This kind of protective film has many shortcomings: first, the stiffness is not enough, it is not suitable for the fast suction and release of the manipulator; It is used to protect the glass with a thickness of 0.4mm when it rotates at high speed during grinding; the fourth is that the adhesive force of ordinary pressure-sensitive adhesive is very high, and it is very difficult to tear it off from the glass lens, and sometimes it even damages the glass lens; fifth, it is not resistant to 180°C High temperature, in addition, the above-mentioned ordinary PP protective film production steps are many, the process is complicated, and the production efficiency is low