TW201641963A - Corona method - Google Patents

Abstract

A corona method includes the following steps. Firstly, a first corona process is performed on a polarizer. Then, a second corona process is performed on the same polarizer. The power of the first corona process and the power of the second corona process range between 800 watts and 1200 watts.

Description

Corona method

This invention relates to a corona method, and more particularly to a corona method for a polarizing plate.

In the bonding process of the polarizing plate and the display panel, the polarizing plate and the display panel are usually bonded through the adhesive. However, with the innovation of material applications, many existing adhesives have been unable to closely bond the polarizing plate and the display panel, resulting in a decrease in the key force between the polarizing plate and the display panel. Therefore, it is urgent to propose a new technique to increase the adhesion between the polarizing plate and the display panel.

Therefore, the present invention proposes a corona method of a polarizing plate, which can increase the adhesion between the polarizing plate and the display panel.

According to an embodiment of the present invention, a corona method of a polarizing plate is proposed. The corona method includes the following steps. Performing a first corona treatment on a polarizing plate; and performing a second corona treatment on the polarizing plate. The corona power of the first corona treatment and the corona power of the second corona treatment are between 800 watts and 1200 watts.

In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

10‧‧‧Polar plate

11‧‧‧First protective layer

11s‧‧‧ surface

12‧‧‧Second protective layer

13‧‧‧Optical layer

100‧‧‧Corona equipment

110‧‧‧First corona roller

120‧‧‧Second corona roller

130‧‧‧Transport roller

140‧‧‧First Corona

150‧‧‧Second Corona

S110 to S130‧‧‧ steps

FIG. 1 is a flow chart of a corona method according to an embodiment of the invention.

2 is a schematic view of a corona device in accordance with an embodiment of the present invention.

FIG. 1 is a flow chart of a corona method according to an embodiment of the invention.

In step S110, a corona device 100 is provided. Please also refer to FIG. 2, which shows a schematic diagram of a corona device 100 in accordance with an embodiment of the present invention. The corona device 100 includes a first corona roller 110, a second corona roller 120, a plurality of transport rollers 130, a first corona 140, and a second corona 150. The polarizing plate 10 can be transported by the first corona roller 110, the second corona roller 120, and the plurality of transport rollers 130 to perform a corona process.

As shown in the enlarged view of FIG. 2, the polarizing plate 10 includes a first protective layer 11, a second protective layer 12, and an optical layer 13, wherein the optical layer 13 is located between the first protective layer 11 and the second protective layer 12.

The optical layer 13 refers to a layer that contributes to optical gain, alignment, compensation, steering, orthogonal, diffusion, protection, anti-sticking, scratch resistance, anti-glare, reflection suppression, high refractive index, etc., and can be controlled, for example. Various surface treatment layers such as alignment liquid crystal layer, easy-bonding treatment layer, hard coat layer, anti-reflection layer, anti-adhesion layer, diffusion layer, and anti-glare layer, such as viewing angle compensation or birefracting.

The material of the first protective layer 11 and/or the second protective layer 12 is, for example, a cellulose resin such as triacetyl cellulose, a polyester resin, a polyether oxime resin, a polyfluorene resin, a polycarbonate resin, a polyamide resin, Polyimine resin, polyolefin resin, (meth)acrylic resin, ring Polyolefin resin (decene-based resin), polyarylate resin, polystyrene resin, polyvinyl alcohol resin, polyethylene terephthalate (PET) layer or a combination thereof. In an embodiment, the first protective layer 11 and/or the second protective layer 12 may also be a combination of multiple layers.

In an embodiment, an adhesive layer (not shown) and a surface protective layer (not shown) may be formed on the first protective layer 11 and/or the second protective layer 12. In one embodiment, the adhesive layer may be formed, for example, by dissolving an acrylic oligomer and a decane coupling agent in an acrylic polymer, or by adding a photopolymerization initiator to the acrylic polymer and irradiating with ultraviolet rays.

In an embodiment, the surface protective layer may be, for example, a synthetic resin film such as polyethylene, polypropylene, polyethylene terephthalate, or a rubber sheet, paper, cloth, non-woven fabric, mesh, foamed sheet, metal. A laminate such as foil.

In step S120, as shown in FIG. 2, when the polarizing plate 10 passes through the first corona 140, the first corona 140 performs the first corona on the surface 11s of the first protective layer 11 of the polarizing plate 10. deal with. In Fig. 2, the first corona 140 is facing the polarizing plate 10 wound by the first corona roller 110 (as shown in the enlarged area 2' of Fig. 2) for the first corona treatment, In other embodiments, the first corona treatment may be performed against the flat polarizing plate 10 (the winding that has not been wound by the first corona roller 110 or has been detached from the first corona roller 110).

After corona treatment, the material of the surface 11s undergoes chemical changes (for example, the surface is oxidized to produce a reactive functional group), and this chemical change is added to the polarizing plate 10 and the display panel (not shown). Adhesion of the adhesive (not shown) to the polarizing plate 10 in the subsequent bonding process. In this step, the power of the first corona treatment is, for example, between 800 watts (Watt) and 1200. Between the tiles. The actual power may be determined by the material of the first protective layer 11, and is not limited by the embodiment of the present invention. In this embodiment, the first corona 140 includes two sub-coronas. However, the embodiment of the present invention does not limit the form of the first corona 140. The first corona 140 of another embodiment may have only one corona. Device.

In step S130, as shown in FIG. 2, when the polarizing plate 10 passes through the second corona 150, the second corona 150 performs the second electric power on the same surface 11s of the first protective layer 11 of the polarizing plate 10. Halo treatment. The second corona 150 can perform a second corona treatment on the polarizing plate 10 (shown as the enlarged area 2 of FIG. 2) wound by the second corona roller 120; in another embodiment, A second corona treatment may also be performed against the flat polarizing plate 10 (which has not been wound by the second corona roller 120 or has been detached from the second corona roller 120).

After the corona treatment, the material of the surface 11s will undergo a chemical change, which may be added to the polarizing plate 10 and the display panel (not shown) in the subsequent bonding process (not shown) and the polarizing plate. 10 closeness. The power of the second corona treatment can be between 800 watts and 1200 watts. In this embodiment, the second corona 150 includes two sub-coronas. However, the embodiment of the present invention does not limit the form of the second corona 150. In another embodiment, the second corona 150 can have only one corona. Device.

In an embodiment, the respective discharge amount of the first corona and/or the second corona may be between 20 W/m ² /min and 55 W/m ² /min, wherein m refers to electricity The halo device width (meters), m/nin refers to the forward speed (meters per minute), and W refers to the watts. In one embodiment, the respective amounts of discharge of the first corona and/or the second corona may be the same or different. In an embodiment, the cumulative discharge of the first corona and the second corona may range from 40 W/m ² /min to 110 W/m ² /min.

Compared with the one-time corona treatment, since the polarizing plate 10 of the embodiment of the present invention is subjected to secondary corona treatment, the adhesion of the surface 11s to the adhesive can be increased. In another embodiment, the polarizing plate 10 can be subjected to two or more corona treatments, as long as the adhesion of the surface 11s to the adhesive can be increased, and the embodiment of the present invention does not limit the number of times the polarizing plate 10 is subjected to the corona treatment.

In addition, when the polarizing plate 10 is subjected to a high-power corona treatment, particles having an influence on optical quality such as oxalate particles may be generated on the surface (other protective layer materials may precipitate different particles). Compared to the one-time higher power corona treatment, since the polarizing plate 10 of the embodiment of the present invention is subjected to the second lower power corona treatment, excessive particles are not generated. Further, in the case where the surface 11s achieves the same corona effect, the primary corona treatment requires higher power, such as 1800 watts or more, and such high power causes the surface 11s to precipitate excessive particles. In contrast, in the embodiment of the present invention, the polarizing plate 10 is subjected to a second lower power corona treatment, thereby reducing or even avoiding particle precipitation, thereby preventing the adhesion of the polarizing plate 10 and the display panel and/or the optical quality from being lowered.

In an embodiment, the power of the first corona treatment may be substantially equal or different from the power of the second corona treatment. In terms of power difference, the ratio of the power of the first corona treatment to the power of the second corona treatment may be, for example, between 0.1 and 3. In addition, since the temperature of the surface 11s after the corona treatment is increased, in order to avoid adversely affecting the quality of the next corona treatment, the stroke between the secondary corona treatments (such as the transmission length of the polarizing plate 10) may be between 5. The embodiment of the present invention is not limited, and the actual stroke may be determined by the corona power, the protective layer material, and/or the type of the adhesive. In one embodiment, the first corona roller 110 is adjacent to the second corona roller 120, that is, there is no other corona roller between the first corona roller 110 and the second corona roller 120.

Moreover, in another embodiment, after slightly modifying the corona device 100, The secondary corona treatment may be performed by the same corona device (such as the first corona 140 or the second corona 150), and in this design, the first corona 140 or the second corona 150 may be omitted.

Referring to Table 1 below, Groups 1 to 5 are experimental groups that perform secondary corona treatment according to an embodiment of the present invention, and Groups 6 to 9 perform a corona treatment experimental group.

Taking the example of Group 3 as an example, the first corona treatment uses 35 W/m ² /min, where m refers to the width of the corona device (meter) and m/min refers to the forward speed (meters per minute). And W refers to Watt. The second corona treatment also used 35 W/m ² /min. It can be seen from the corresponding test results that both foreign matter precipitation and adhesion are in line with expectations (indicated by "OK"). Groups 1, 2, and 4 to 5 have similar effects because they are subjected to secondary corona treatment, and will not be described again.

In the case of Groups 6 and 7, for example, since the corona power is insufficient (only 27 W/m ² /min), the adhesion is not passed (indicated by "NG"). In the eighth and ninth groups, for example, since the single corona power is too high, although the adhesion is passed, there is a problem that foreign matter is precipitated.

In summary, since the corona method of the embodiment of the present invention adopts a second lower power corona treatment, the foreign matter precipitation can be reduced or even prevented, and the adhesion between the polarizing plate 10 and the adhesive can be increased.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

S110 to S130‧‧‧ steps

Claims (10)

A corona method for a polarizing plate, comprising: performing a first corona treatment on a polarizing plate; and performing a second corona treatment on the polarizing plate; wherein the corona power of the first corona treatment and the first The corona power of the second corona treatment is between 800 watts and 1200 watts. The corona method of claim 1, wherein the first corona treated corona power and the second corona treated corona power are substantially equal. The corona method of claim 1, wherein the discharge amount of the first corona and/or the second corona treatment is between 20 W/m ² /min and 55 W/m ² /min. . The corona method of claim 1, wherein the ratio of the corona power of the first corona treatment to the corona power of the second corona treatment is between 0.1 and 3. The corona method of claim 1, wherein the polarizing plate comprises: a first protective layer; a second protective layer; An optical layer is disposed between the first protective layer and the second protective layer; wherein the step of performing the first corona treatment on the polarizing plate comprises: the first protective layer and the second protective layer Performing the first corona treatment on a surface of one of the surfaces; and performing the second corona treatment on the polarizing plate includes performing the second corona treatment on the same surface. The corona method of claim 1, further comprising: providing a corona device, the corona device comprising a first corona roller and a second corona roller; wherein, performing the polarizing plate The step of the first corona treatment includes: performing the first corona treatment on the polarizing plate wound around the first corona roller; wherein the step of performing the second corona treatment on the polarizing plate comprises: The second corona treatment is performed on the polarizing plate wound around the second corona roller. The corona method of claim 6, wherein the first corona roller is adjacent to the second corona roller system. The corona method of claim 1, wherein the transfer path between the first corona roller and the second corona treatment is between 5 meters and 15 meters. between. The corona method of claim 6, wherein the corona device further comprises a corona device for performing the first corona treatment and/or the second corona treatment on the polarizing plate. The method of application of the corona patentable scope of Item 3, wherein the first corona discharge and the accumulated amount of the second corona treatment process is between 40W / m ² / min to 110W / m ² / min.