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Production method of LCD polarizer

At present, the production technology of LCD polarizer is divided into two categories: dry method and wet hair method by the extension process of PVA film; PVA film dyeing method is divided into two categories: dye series and iodine dyeing. Polarizer dry production technology refers to the PVA film is in a certain temperature and humidity conditions in the vapor environment for the extension of visual habits, at the same time requires a small color deviation of polarizer products, to ensure the LCD most: the final product appearance color consistency, mainly by the polarizer product color coordinate parameters l, a, B and their values Control tolerance range to identify, generally the smaller the scope of control tolerance, the better.

LCD DISPLAY POLARIZER

The durability index of polarizer includes four technical indexes: high temperature resistance, humidity and heat resistance, low temperature resistance and cold and heat shock resistance. The most important one is the level of humidity and heat resistance index. High temperature resistance refers to the working conditions of the polarizer at suitable baking temperature. At present, according to the technical grade of the polarizer, it is generally divided into three types: the working temperature is 70 C 500HR; the medium durable type: the working temperature is 80 C 500HR; the high durable type: the working temperature is above 90 C 500H. The technical index of humidity and heat resistance refers to the performance of polarizer under the condition of constant temperature and humidity. It can also be divided into three technical grades: general type: humidity and heat working conditions are 40 C 90% RH 500HR; medium durability type: humidity and heat working conditions are 60 C 90% RH 500HR; high durability type: humidity and heat working conditions are 70 C 95RH 500HR; and above 70 C . PVA film, iodine and iodide are the basic materials of polarizing film, which are easy to hydrolyze. At the same time, the pressure-sensitive adhesive used in polarizing film is easy to deteriorate under high temperature and humidity. Therefore, the most important technical index of the durability of polarizing film is high temperature and humidity resistance. If it is high temperature and humidity resistance Other indicators of durability do not usually occur between thermal indicators. "Fudi" brand general-purpose PLN products and durable PMN products can meet the requirements of the durability specifications specified in their respective technical grades.

SUNGLASSES POLARIZER

The bonding characteristics of polarizer mainly refer to the characteristics of polarizer pressure sensitive adhesive, generally including: the peeling force between pressure sensitive adhesive and glass substrate, the peeling force between pressure sensitive adhesive and peeling film, the peeling force between polarizer protection film and polarizer, and the bonding durability of pressure sensitive adhesive. The peeling force between pressure sensitive adhesive and glass substrate is also called adhesive bonding strength, which is the most important bonding characteristic index of LCD polarizer products. This technical index is usually measured by EIAJ-ED-2521A standard of Japan Electronics Machinery Industry Association. It is expressed in g/25mm unit. Generally, the peeling force of LCD polarizer pressure-sensitive adhesive to glass substrate is more than 500g/25mlm, but the upper limit of practical use is generally less than 1000g/25mm. Practical examples show that when the peeling force of the adhesive on the glass substrate is below 500 g/25 mm, the polarizer will automatically peel off and warp after bonding on the surface of the glass screen.

3D GLASSES POLARIZER

The appearance performance of polarizer mainly refers to the surface flatness and the number of appearance defects of polarizer products. These technical indicators mainly affect the utilization rate of polarizer products in the patch. These technical indicators in the polarizer industry usually have a more consistent technical requirements, generally for each polarizer product (500x1000mm) 15 less than 150 Mm shortcomings. Because the final appearance of polarizer products is inspected by manual visual inspection, the distribution of appearance defects will have a certain discrete distribution in the batch production process of polarizer products. For this reason, each polarizer production enterprise adopts a certain difference between internal control specifications and delivery specifications to ensure delivery quality standards. . However, it should be noted that since 150 in Mn is already close to the minimum limit of human visual discrimination, especially in the industrial mass production process, inspectors will also produce visual fatigue during long-term work, so the 150 um defect inspection standard is more reasonable and credible, if insisted on less than 150 micron defect inspection standard. There is no credibility index in actual use.


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