JPS6054641B2 - Automatic continuous pasting method of adhesive polarizing plate to cells - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically and continuously attaching an adhesive polarizing plate to a cell, and the present invention relates to a method for automatically and continuously attaching an adhesive polarizing plate to a cell, and the present invention relates to a method for automatically and continuously attaching an adhesive polarizing plate to a cell. In order to be able to laminate a polarizing film with polarizing properties to the surface of a liquid crystal-filled glass cell automatically and continuously without creating any air bubbles, the polarizing film is oriented perpendicularly to the length direction. The purpose is to cut in half into a certain shape.

Conventionally, in order to bond an adhesive polarizing sheet to a liquid crystal-filled glass cell (hereinafter abbreviated as cell), the adhesive polarizing sheet was cut into a predetermined shape in advance, and each sheet was cut by hand or using a jig. In other words, prepare a cell with a clean surface, peel off the release-treated adhesive surface protection sheet of the adhesive polarizing sheet cut into a predetermined shape to expose the adhesive surface, and place the adhesive surface on the cell by hand or While positioning one sheet or several sheets at a time using a jig, perform temporary adhesion to the minimum possible level so that the cell surface and adhesive surface do not slip in position while avoiding air bubbles at the interface, and then temporarily bond the adhesive polarizing sheet. A commonly used method for adhering both cells without entraining them is to set one or several adhered cells in a jig and then pass them through a laminator roll for final adhesion.

Furthermore, before pasting, temporary pasting is carried out after repositioning at a fixed pitch on an adhesive tape, alignment, and pasting to the cell in a vacuum.

However, with these bonding methods, it is difficult to peel off the release-treated sheet, it is difficult to position it on the cell, and air bubbles tend to be drawn into the interface between the cell and the polarizing sheet during temporary bonding to the cell. Due to this, lamination workability is poor.
The major drawbacks include a decrease in bonding yield and a decrease in reliability due to the presence of air bubbles in the completed cell.

The biggest cause of these drawbacks is the variation due to manual work. The present inventors have focused on the fact that an automatic continuous lamination method is preferable for laminating polarizing sheets and cells in order to eliminate the defects of the conventional manual lamination method described above, and as a result of their studies, they have invented the present invention. This is what led to this.

That is, the present invention uses a carrier tape that has been subjected to a release treatment on at least one surface, and a polarizing plate of a predetermined width that has a pressure-sensitive adhesive layer formed on one surface and a surface protection sheet on the other surface. After the polarizing plate is brought into contact with the carrier tape through the adhesive layer, half-cutting is performed intermittently in the vertical direction using two knife blades set at a predetermined interval in the longitudinal direction of the polarizing plate. The polarizing plate on the tape is cut into a predetermined shape, leaving the remaining parts, and unnecessary parts are removed.After arranging the polarizing plate pieces in a certain direction, the carrier tape is peeled off from the adhesive polarizing plate by running it. By blowing air, the adhesive polarizing plate is attracted to the lower end of a vacuum chuck that can be moved up and down, and at the same time, the chuck is lowered and the adhesive polarizing plate is temporarily pasted with its adhesive surface onto a cell that is waiting below. This is characterized by the fact that actual adhesion is performed. Ru.

By cutting the polarizing plate on the carrier tape into a predetermined shape in this way, it is possible to automatically and continuously bond the cell to the cell, thereby preventing air bubbles from being drawn in during bonding. ! Ru.

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings. A release-treated sheet, which has been subjected to a release treatment on at least one side, is coated with a pressure-sensitive adhesive 2, and a polarizing film (film 3) is applied.
(For example, a polarizing film made by adsorbing and orienting iodine on polyvinyl alcohol to give it polarizing properties) is attached to obtain an adhesive polarizing plate, which is then cut into long pieces of a predetermined width.

At this time, depending on the shape of the adhesive polarizing plate, long products are slit, and single-plate products are cut to a predetermined width and then spliced into a long shape. Next, prepare a release-treated carrier tape 1 that is slit to the minimum necessary width, that is, the same width as the adhesive polarizing plate with a release-treated sheet, or slightly wider than that, and
On top of that, a long adhesive polarizing plate with a release treatment sheet is laminated so that the release treatment sheet is peeled off and the exposed adhesive surface 2 is in contact with it.

In this way, a long adhesive polarizing plate having the structure shown in FIG. 1 is obtained. Then, this long adhesive polarizing plate is passed through a cutting machine equipped with two blades set at a predetermined interval for cutting in half, and the blades are applied perpendicularly to the longitudinal direction of the adhesive polarizing plate until the bottom layer of the carrier tape is cut. There is a method in which cuts are made intermittently in the adhesive polarizing plate on the top surface while avoiding cuts, and unnecessary parts are removed.

The cutting machine used at this time is schematically shown in FIG. 2, in which 5 is a die-cutting mold and 6 is an unnecessary part peeling device. The long adhesive polarizing plate 7 with a carrier tape fed out from the material feeding reel 8 is intermittently sent to the die-cutting mold 5 through a turn roll 9 and a feed roll 10.
After being cut in half by the mold 5, unnecessary portions are removed by an unnecessary portion peeling device 6 and wound onto a take-up reel 11. To explain the details of half-cutting in the die-cutting mold 5, in the enlarged view of the die-cutting mold shown in FIG. are supported in parallel so that they can be adjusted to a predetermined pitch. Although not shown in the drawings, this cutting machine is equipped with a feeding device, and this feeding device moves the upper die 12 into one piece, supporting two knife blades 13 which are adjusted to a predetermined cutting size of the polarizing plate 7. Each time the lower die 15 is moved up and down, the polarizing plate 7 on the lower mold 15 is moved intermittently by an amount equal to the predetermined cutting size plus a predetermined pitch. In this way, the predetermined pitch portions of the polarizing plate that are intermittently cut in half leaving only the carrier tape at the bottom layer are removed as unnecessary portions by a peeling device 6 such as an air feed pin at the same time as or immediately after the half cutting. be.

The adhesive polarizing plate thus cut in half into a predetermined shape is shown in FIG.

In the above-mentioned half-cutting with a knife blade, the angle of the knife blade relative to the polarizing plate at the time of cutting is preferably 20 degrees or less, and if it is more than that, there is a risk of air bubbles being interposed at the interface between the polarizing plate and the carrier tape. Further, the bottom dead center accuracy is preferably ±0.01 or less. By cutting with two blades in this way, compared to the method used in conventional sticker printing, in which unnecessary parts are cut and peeled off in the shape of a hollow, it is possible to cut the unnecessary parts on both sides in the longitudinal direction. Since peeling is not required, the number of unnecessary parts to be peeled is less than 112.Therefore, there is less material loss and dimensional accuracy is good, and the stress concentrated at each corner is small, which prevents defects such as lifting at the corners. It is possible. Furthermore, by removing the loss portion, the stress applied during cutting is alleviated, and lifting and deformation are eliminated. The polarizing plate cut into a predetermined shape by the above method and adhered onto the carrier tape is successively pasted to the cells, for example, by a method as shown in FIG.

That is, the long adhesive polarizing plate 7 with a carrier tape fed out from the feeding reel 16 is peeled off from the carrier tape 1 at the edge portion 17 and brought out under the vacuum chuck 18, and at the same time is sucked into the vacuum chuck by air blown from the air nozzle 19. Can be attached.

At this time, the positioning of the adhesive polarizing plate 7 is performed by a positioning sensor 20, and at the same time, the feed reel 16 stops, and the vacuum chuck 18 with the adhesive polarizing plate attached to its lower end passes through the positioning guide 21 and descends. An adhesive polarizing plate is temporarily attached to the cell. When the vacium runs out, the vacuum chuck 18 rises and returns to its original position. At the same time, the cell carrier feed roll 23 rotates, and the cells 22 to which the polarizing plate has been temporarily pasted also move forward and pass through the presser rubber roll 24, thereby performing the final adhesion. The cell to which the adhesive polarizing plate is attached is charged by 25 automatic cell supply devices. The above operation is repeated intermittently to automatically attach the adhesive polarizing plate to the cell. Therefore, by using the adhesive polarizing plate with a long carrier tape in the method of the present invention, the workability, reliability, and yield are improved compared to the conventional method of laminating adhesive polarizing plates cut into small pieces. This has great advantages in terms of improvement.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the configuration of a long adhesive polarizing plate used in the present invention, FIG. 2 is a schematic diagram of a cutting machine used in the present invention, and FIG. 3 is a schematic diagram of the cutting machine shown in FIG. 2. FIG. 4 is an enlarged front view of the die-cut mold part in the figure, FIG. 4 is a cross-sectional view showing an adhesive polarizing plate half cut into a predetermined shape, and FIG. An explanatory diagram showing an example is shown. 1...Carrier tape, 2...Pressure sensitive adhesive layer, 3...Polarizing film, 4...
...Surface protection sheet, 13...Knife blade.

Claims (1)

[Claims] 1 A long carrier tape that has been subjected to a release treatment on at least one side, and a pressure-sensitive adhesive layer formed on one side,
A long adhesive polarizing plate made by contacting a polarizing plate of a predetermined width with a surface protection sheet on the other side via an adhesive layer is passed through a cutting machine equipped with two knife blades set at a predetermined interval. , Apply the knife blade perpendicularly to the length direction of the polarizing plate and cut in half intermittently to cut the polarizing plate on the tape into a predetermined shape, leaving only the carrier tape, and remove unnecessary parts. After arranging the polarizing plate pieces in a certain direction, the carrier tape is peeled off from the adhesive polarizing plate by running it, and the adhesive polarizing plate is sucked to the lower end of the vacuum chuck which can be moved up and down by air blowing, and at the same time A method for automatically and continuously adhering an adhesive polarizing plate to a cell, characterized in that the chuck is lowered and the adhesive polarizing plate is temporarily pasted on the cell with its adhesive surface, and then the final adhesion is performed. .