In 2014, the global demand for polarizing film reached 397 million square meters, 2015 polarizer market size of about 440 million square meters, is expected in 2016 global polarizing film demand will reach 516 million square meters, the market size of nearly 14 billion US dollars. Global demand for polarizing film grows steadily. China as the world's first electronic information industry, manufacturing and consumer countries, the global demand for polarizing film contribution to the greatest growth. In 2014, China's demand for polarizers has reached 59 million square meters; according to the status of China's LCD production capacity exhibition is expected to 2018, the demand for Chinese polarizer will reach 165 million square meters. Corresponding with the demand, in 2014 the Chinese polarizer market capacity reached 1.5 billion US dollars; is expected to 2018, the domestic market size will reach 4.36 billion US dollars.
It is worth mentioning that Samsung is also optimistic about China as a major TV polarizer main market, the next five years, the global polarizing film market annual growth rate of 6%, the Chinese market growth rate will exceed 16%.
Overall Polaroid Market Prospects (2011 ~ 2016)
Analysis of Polarizer Production Enterprise
At present, the global polarizing film market is dominated by Japan, South Korea and Taiwan enterprises, the main raw material of polarizing film TAC film and PVA film is firmly in control of Japanese companies. Japan Fuji occupy TAC film 59% of the market share, KONICA occupy about 21% of the market. Japan Kuraray (Kuarary) PVA film accounted for more than 70% of the market.
Polarizer production capacity in the first half of 2016 Proportion:
The following are the world's major polarizer manufacturers:
Japan Nitto Denko Co., Ltd. was established in October 1918, one of the world's top 500 companies, headquartered in Osaka, Japan, is Japan's largest chemical industry, the most innovative ability of listed companies. Since 1979 to enter the Chinese market, has in Hong Kong, Shanghai, Beijing, Tianjin, Xiamen, Shenzhen and other places set up 27 production and sales company, in 1975 began production and sales of polarizers. Currently has 14 production lines, annual production capacity up to 110 million square meters.
Japan's Sumitomo Chemical Co., Ltd., founded in September 1913, owns 167 subsidiaries, the world employs about 3.1 million people, mainly engaged in chemical industry, energy industry, in 1988 began production and sales of polarizers. Currently has 13 production lines, annual production capacity of 87 million square meters.
Japan's Sanli Chemical Co., Ltd., is a research and development, production and sales as one of the high-tech chemical companies, the world's first production of polarizer enterprises, since 1963 began production and sales of polarizers. Currently has seven production lines, with an annual capacity of 30 million square meters. Due to financial problems, in recent years, no capacity expansion plans.
LG Chemical is one of the three major groups in Korea LG Group, is one of its most important pillar industries. Since its founding in 1947, LG Chem has grown to become Korea's largest integrated chemical company, leading Korea's chemical industry, through continuous innovation and research and development activities for half a century. With 10 production lines, with an annual capacity of 75 million square meters. In Nanjing with factories - LG Chemical (Nanjing) Information Electronic Material Co. New 2300mm production line, is expected to put into operation in the first half of 16, the new capacity of 24 million.
Samsung SDI Samsung Electronics Group in the field of subsidiary companies, the original refers to China's Samsung tube production sector, after the liquid crystal display technology, switching production of lithium batteries, polarizers and other products. Samsung SDI in 2007 after the acquisition of ACE DIGITECH into the polarizer market. In 2013 the company developed the world's first successful use of excellent optical properties of PET film instead of polarizing film material TAC film technology, and successfully applied to TV products.
Currently has four production lines, annual production capacity of 32 million square meters. 2015 to spend 180 million US dollars in the establishment of polarizer production line in Wuxi, plans to put into operation by the end of 16, is expected to add capacity of 3000-4000 million square meters per year.
Chi Mei materials
Chi Mei Materials in 2005 by the Chi Mei Industrial Investment was founded, the products mainly used for LCD display with polarizer. With four production lines, with an annual capacity of 25 million square meters. 2014 in Kunshan to establish two production lines, in September 2015 and Jinjiang Group, will speed up the speed, is expected to add capacity of 12 million square meters.
Of special photoelectric
Founded in March 1987, Taiwan Powertech Optoelectronics Technology Co., Ltd. is the first company in Taiwan to manufacture and process polarizing plates with the introduction of Japan's Polaroid technology. Currently has nine production lines, with an annual capacity of 40 million square meters.
Taiwan BenQ Materials Co., Ltd. (formerly the letter of the letter) under the "BenQ Friends of the Group," established in 1998 to set up, with the photoelectric materials on the rapid mass production capacity of professional technology into the polarizing film market has become "BenQ AUO Group "to LCD as the core of an important part of the development strategy. Currently has four production lines, with an annual capacity of 30 million square meters.
Three profitable spectrum
Shenzhen Sanli Spectrum Optoelectronics Technology Co., Ltd. was established in 2007, mainly engaged in the development, production and sales of polarizing films. Completed in 2011 for television, computer LCD wide production line. Currently has three production lines, with an annual output of 6 million square meters. 2014 investment in Hefei 2 billion, will build three wide TFT polarizing film line, is expected to put into operation in 2018, put into operation after the total capacity of 35 million square meters per year.
Founded in 1995, Shengbo Optoelectronics is a professional polarizer manufacturer in China. Its products cover a wide range of fields including TN, STN, CSTN, TFT and polarized glasses. 2010 began production for mobile phones and flat-panel computer screen narrow polarizer, wide polarizer production line in 2012 to achieve trial production.
Currently has two production lines, annual output of 8 million square meters per year. Under construction, there are "Phase II of Polarizer for TFT-LCD". The project is two large-scale production lines with an estimated production capacity of 13 million square meters per year, originally planned to cooperate with Japan, but not implemented. .
In addition to Sanli spectrum and Shengbo optoelectronics, there are many domestic enterprises such as Wenzhou Overseas Chinese industry, Foshan Vinda, Sheng-hua technology engaged in polarizing film enterprises, but in the use of polarizer TFT-LCD no contribution.
Polaroid production is mainly divided into three processes before, during and after, are:
1, before the process (TAC membrane cleaning and PVA membrane extension and composite)
The pre-treatment includes TAC film and the extension and compounding of PVA film. TAC membrane pretreatment process TAC membrane lye treatment, washing the residual lye after washing tank, drying rewinding, the process of the main purpose is to reduce the contact angle of TAC film, easy to fit with the PVA film. details as follows:
PVA film extension and composite process is first after the PVA film immersed in pure water swelling ditch, the absorption of two-way absorption of iodine molecules, and then through the extension of the slot to the orientation of iodine molecules, after drying PVA film and The TAC films after the two-layer pretreatment were combined together to obtain a polarizing film. details as follows:
2, the process (coating and composite production line)
In the process is coated with pressure-sensitive adhesive release film and other composite film process. The pressure sensitive adhesive is coated on the release film, and the moisture in the pressure sensitive adhesive is evaporated out through the oven, and the film is laminated with the polarizing film produced in the previous process, and then wound into a constant temperature curing chamber Curing, and sometimes due to different product types, the need to compound other related optical film. details as follows:
3, after the process (cutting production line)
The cured polarizing sheet is cut, edged, cleaned, inspected and packed according to the required size.
Sheeting machine :
The Principle and Classification of Polarizer
Because the iodine molecules are arranged in the same direction will produce asymmetric electron density, so in different directions of the polarized light absorption coefficient of a certain difference, if the light polarization direction and iodine molecular chain axis direction to maintain 90 °, then polarization Light can pass. Conversely, through the intensity of light will continue to decrease, or even to completely obscured. Therefore, it can be concluded that the iodine molecule has good long-chain polarizability. At this stage, the most common polarizer was invented by the 1938 Rand.
The polarizing sheet includes a transmission-type polarizing film, a reflection-type polarizing film, a semi-transmissive half-reflective polarizing film, and a compensating-type polarizing film, according to the function.
Polaroid by staining method classification:
Iodine polarizer: easy to obtain high transmittance, high degree of polarization optical properties, but poor resistance to high temperature and humidity.
Dye Polarizer: It is not easy to obtain high transmittance and high degree of polarization optical properties, but high temperature and humidity resistance is better, can be used for harsh environments. Commonly used in products do not TN / STN / TFT / PMVA / OLED.
Performance Index of Polarizer and Its Influencing Factors
Appearance Index of Polarizer and Its Influencing Factors
The appearance of the polarizer, including surface roughness, the appearance of the number of points on the polarizer products in the patch process have a more direct impact on the utilization, in order to ensure that the appearance of indicators meet the relevant standards, the production of the polarizer Strict control, including material selection, production process, transportation, storage, storage environment.
OPTICAL PROPERTIES AND INFLUENCING FACTORS OF POLARIZED
Polarizer optical properties include the following indicators, namely, the degree of polarization, light transmittance, anti-ultraviolet performance, for ordinary LCD products in the application of the polarizer, the general application of the degree of polarization and light transmission rate is relatively high products, So as to promote the display quality and efficiency of LCD display devices to improve and reduce energy loss; However, for ordinary iodine dyeing polarizer, the degree of polarization and transmittance are two contradictory factors, generally high degree of polarization, the light transmittance The polarization degree of the conventional polarizing film is in the range of 90% to 99%, and the light transmittance index is in the range of 41% to 44% by the influence of the hue, which is unavoidable. Tonal indicators of the basic role is to meet the visual habits, polarizers as little deviation as possible, to ensure that the color tone of LCD products consistency.
Durability Index of Polarizer and Its Influencing Factors
Polarizer durability refers to the polarizing film durability, as well as the durability of pressure-sensitive adhesive, the former refers to the polarizing film of high temperature, heat, low temperature and thermal shock and other properties, specific factors, including its basic material, Dyeing materials, dyeing process. Specifically, the PVA film selected by the polarizer has a molecular weight proportional to the draw ratio and its durability. In addition, the degree of coloring of the polarizing film at the time of production and the hydrolysis resistance of the dye also have an influence on the durability of the polarizing film. Since iodine and iodide are very easily hydrolyzed materials, the durability of the dye-based polarizer and iodine Dyeing Polished products have a great advantage in durability.
To ensure that the polarizer and the LCD panel can be close to the glass panel, in the outer layer of polarizer to apply pressure-sensitive adhesive, and to compound release film to protect the pressure-sensitive adhesive, if the polarizer and the sticky The adhesive is directly peeled off from the film, without the use of solvents, heat and other methods, only a mild Shi pressure can be applied, the pressure-sensitive adhesive can be firmly bonded with the sticky material, therefore, must require pressure sensitive Glue with a certain re-peeling, peel strength and a certain holding force and the beginning of the sticky force. Production process of pressure sensitive adhesive technology has an impact on the production of polarizers, including the production of adhesives, storage, technology, etc., so conventional polarizer manufacturers in the adhesive process conditions will be determined after the application of a long Time, and its process quality requirements are very harsh, in order to ensure the quality of production.
Polarizer composition and cost
Layers constitute the material function
1 surface protection film PET / PSA polarizing film protection
2 protective layer TAC polarizing film support protection
3 Polarizing Substrate PVA Polarization Mechanism
4 protective layer TAC polarizing film support protection
Adhesion of PSA substrate
6 separation membrane PET adhesive protection
Properties: Polyvinyl alcohol, with high transparency, high ductility, good iodine adsorption, good film characteristics, before the extension of the thickness of 75 microns, 60 microns, 45 microns and several other specifications.
Role: the membrane adsorption of iodine to the two-way absorption molecules after extended alignment, play the role of polarization, is the polarizer core, determines the polarizer polarizing properties, transmittance, color and other key optical indicators.
Properties: Triacetate cellulose film, with excellent support, optical uniformity and high transparency, acid and alkali resistance, ultraviolet resistance, thickness of 80 microns, 60 microns, 40 microns, 25 microns and other specifications.
Role: on the one hand as a PVA film support, to ensure that the extension of the PVA film will not retract, on the other hand to protect the PVA film from water vapor, ultraviolet and other external substances damage, polarizers to ensure environmental weather resistance.
Characters: high strength, good transparency, acid and alkali, anti-static characteristics, the general thickness of 58 microns.
Role: one side coated with pressure sensitive adhesive, paste in the polarizer can protect the polarizer body from external damage.
Pressure - sensitive adhesive
Traits: also known as pressure-sensitive adhesive, and TAC has a good adhesion, transparency, and less residual plastic. Polaroid pressure-sensitive adhesive with a thickness of about 20 microns.
Role: Polaroid paste in the LCD panel on the adhesive material, determines the adhesive properties of polarizers and patch processing performance.
Character: One side coated with silicon coating PET (polyethylene terephthalate) film, with high strength, easy deformation, good transparency, high surface roughness characteristics, different applications with different peel strength.
Function: protect the pressure sensitive adhesive layer from damage and avoid the formation of air bubbles before the polarizer is attached to the LCD.
Traits: for the unilateral aluminum foil PET film, high reflectivity.
Role: mainly used for not reflecting the light source LCD, the external light reflected back as a display of light.
Phase difference film
Traits: also known as the compensation film, different applications have different optical anisotropy and compensation.
Role: to compensate for liquid crystal display LCD liquid crystal phase difference, play to enhance the contrast of the LCD monitor, viewing angle, correcting the display color and so on
The polarizing sheet is a PVA film. PVA film adsorbed iodine molecules with two-way absorption function after dyeing, and the iodine molecules are arranged in order on the PVA film by stretching to form a polarizing film with uniform two-way absorption performance, the transmission axis perpendicular to the stretching direction . PVA film stretching and iodine molecular arrangement as shown below: