JPS6039104B2 - Film adhesion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the method of adhering a film having a pressure-sensitive adhesive or adhesive applied to the surface onto the surface of an object.

Liquid crystal cells are widely used as time display devices for digital electronic watches. Two polarizing films, upper and lower, are adhered to this liquid crystal cell, and the process of adhering these polarizing films is part of the liquid crystal cell manufacturing process. This was an obstacle to rationalization.

That is, the polarizing film has a structure in which the display is coated with an adhesive or an adhesive, and the surface is covered with a protective film,
Automatic adhesive machines such as conventional labeling machines cannot be used to adhere this polarizing film to the liquid crystal cell because they damage the polarizing film or cause misalignment after adhesion, so the protective film can be easily peeled off with tweezers. Since the bonding process is done manually by positioning the cell body and polarizing film using a suitable jig and bonding them one side at a time, this process, combined with the streamlining of other processes in LCD cell manufacturing, has reduced the cost of half of the bonding process. A similar amount of man-hours was spent.

An object of the present invention is to solve the above-mentioned drawbacks, and to provide a method that can bond a film coated with an adhesive or an adhesive, such as a polarizing film, without damaging it and in a short time. .

The configuration of the present invention will be explained below with reference to the drawings.

FIG. 1 is a structural diagram of a liquid crystal cell, in which figure a shows the state of the adhesive on the upper and lower polarizing films and the cell body, and figure b shows a completed cell in which the polarizing film is adhered to the liquid crystal cell body.

In the liquid crystal cell body 1, an upper glass 2 and a lower glass 3 are joined together by a sealing member of about 10 mm, and a liquid crystal substance is injected into the gap between them.

The upper polarizing film 4 includes an upper protective film 6 a lower protective film 7 and a glue layer 5
Similarly, the lower polarizing film 8 has a laminated structure consisting of an upper protective film 10, a lower protective film 11, and a glue layer 9. Both polarizing films 4 and 8 have cross sections with the glue layer as the inner surface. It is pre-shaped into an arc shape.

Both polarizing films 4 and 8 are integrated with the liquid crystal cell body 1 by an adhesion process to be described later, thereby completing the liquid crystal cell 12 shown in Figure b. FIG. 2 shows a working process diagram for adhering and attaching a polarizing film in the present invention.

The work is film supply process (A for upper polarizing film, A for lower polarizing film, A'), protective film peeling process (B for upper polarizing film, B for lower polarizing film), polarizing film curling process (C for upper polarizing film, C for lower polarizing film). ') and adhesion step D.

FIGS. 3a and 3b are a perspective view and a sectional view showing the state in which the polarizing film is held in the film supply step AA'. The polarizing film is arranged in a curved shape within the frame of the carrier 20 and is held by its own elasticity. ing.

Note that the upper polarizing film 4 and the lower polarizing film 8 are housed in the carrier 20 in the same direction. The protective film peeling process B includes a first peeling process B for peeling off the upper protective film 6, a reversing process B for reversing the carrier 20, and a second peeling process B for peeling off the lower protective film 7.
It is constituted by a peeling process B3.

In each of the above-mentioned protective film peeling steps B and B3, a method is adopted in which the protective film is peeled off using an adhesive tape that is normally used for purposes such as insulation, wrapping, and bundling. The operation of the protective film stripping device will be explained with reference to FIG.

FIGS. 4a to 4f are diagrams of the protective film peeling process in the protective film peeling device, and the configuration will be explained with reference to FIG. 33 is a carrier push-up piece 34 which is a polarizing film presser that prevents the polarizing film from being lifted up when the protective film is peeled off, and an aura 36 for removing the protective film is attached to a roller holder 35 which also serves as an adhesive tape thrusting operation. There is an adhesive tape protrusion lever 37 on the top.

The protective film peeling adhesive tape 38 comes out from the mounting flange 39 and is wound around the winding flange. The operation of the protective film peeling apparatus having the above structure will be explained step by step.

The carrier 20, which has flown on the conveyor belt 30, is in the state shown in figure a, and its positioning calendar is detected by the detector emitter 32 and the detector receiver 33, a unit activation signal is generated, and a claw comes out from the side of the rail. Then, as shown in figure b, the carrier push-up piece 33 rises and lifts the carrier 20, and the adhesive tape 33 is adhered to the upper protective film 6 of the polarizing film 4 via the peeling roller 36. Next, C As shown in the figure, the roller receiver 35 is raised and the protruding lever 37 is expanded, and the upper protective film 6 of the polarizing film 4 is peeled off from both ends and attached to the adhesive tape 38 side. Next, as shown in figure d, the carrier push-up piece 33
is lowered, and the roller receiver 35 returns to its original position. Next, as shown in Fig. e, as the roller receiver 35 descends, the tape winding flange 40 rotates a certain amount to wind up the peeled upper protective film 6. Then, as shown in figure f, the carrier 20 is conveyed to the next process by the conveyor belt 3. This operation is performed in the first peeling process of B, , B' in Fig. 2, and then B2, B2'
The lower protective films 7 and 11 are reversed in the reversing step B3', and the lower protective films 7 and 11 are peeled off in the second peeling step B3'. In the curling process shown in FIG. 2C, curling as shown in FIG. 1A is carried out by blowing hot air at about 80:00 for several seconds while both polarizing films 4 and 8 are housed in the carrier 20. Furthermore, in the adhesion process D, the liquid crystal cell body 1 automatically supplied to the index table 501 described later undergoes a cleaning process using a dryer, and in the temporary adhesion process D, the upper and lower polarizing films 4 and 8 are temporarily adhered to the liquid crystal cell body 1 at the same time. .

Figure 5 is a configuration diagram of the temporary bonding device, and figure a is the liquid crystal cell body 1.
Figure b shows a state in which both polarizing films 4 and 8 are aligned, Figure b shows a state in which the temporary adhesion device operates and temporary adhesion is performed, and Figure C shows a plan view of the polarizing film pusher plates 41 and 42.

There is an upper polarizing film pushing jig plate 41 and an upper polarizing film pushing piece 43 fixed to the spindle of the machine body.The upper polarizing film pushing jig plate 41 holds the upper polarizing film 4 removed from the carrier 20 and the liquid crystal cell body 1. A polarizing film guide pin 45 is press-fitted so as to move to a fixed position.

The lower polarizing film side is similarly formed of a lower polarizing film pushing jig plate 42, a lower polarizing film pushing piece 44, and a lower polarizing film guide pin 46. As for the movement, first, the carrier 20 is set above and below the liquid crystal cell body 1 supplied to the index table 50', the upper and lower polarizing film pushing guide plates 41 and 42 move, and the upper and lower polarizing film guide pins 45 and 46 move the liquid crystal cell body 1. Next, the upper and lower polarizing film holding pieces 43 and 44 push the polarizing films 4 and 8 out of the carrier 20 and temporarily adhere them to the upper and lower surfaces of the liquid crystal cell body 1 as shown in FIG. 5b.

The pushing force at this time is preferably several tens of minutes, and if it is stronger than this, it tends to cause adhesive bubbles between the liquid crystal cell body 1 and both polarizing films 4 and 8 after adhesion, and on the other hand, if it is weaker, a positional shift occurs. The orientation of the upper and lower polarizing films 4 and 8 with respect to the liquid crystal cell body 1 in the temporary adhesion step D is such that the adhesive layer is oriented toward the liquid crystal cell body 1 side by the reversing step shown in FIG. 2E. The main bonding step D2 is a step of fixing the temporarily bonded upper and lower polarizing films, and will be explained with reference to FIG. FIG. 6 is a block diagram of the present adhesive device, in which FIG. 6A is a front view, FIG. 6B is a side view, and FIG. The upper roll 61 and the lower roll 62 rotate at the same speed in the direction of arrow R, and the gap between them is the completed cell 12.
It is set 50 to 100 Buddha positions narrower than the original.

FIG. 6〇 When the temporarily bonded liquid crystal cell 12 shown in this figure is sent in the direction of arrow L into the gap between the upper roll 61 and the lower roll 62 as shown in FIGS. 6a and 6b, the upper polarizing film 4 is curled. The lower polarizing film 8 is gradually bonded to the glass surface of the liquid crystal cell body 1 while spreading to both sides as if pushing out air. Main adhesion is performed without creating bubbles on the surface.

The roll diameter is preferably 300 mm or less; if it is larger than this, bubbles are likely to form between the polarizing film and the glass surface after main adhesion, no matter how curled the polarizing film is. As described above, according to the present invention, since the film coated with an adhesive or the like is held and transported by the carrier by its own elasticity, it is extremely easy to feed the film to the carrier, and it also prevents the peeling of the protective film in the subsequent process. Adhesion to the surface of an object becomes easy, and by curling the film, it becomes possible to adhere the two without generating air bubbles on the adhesive surface. The polarizing film bonding work shown in this example requires less than half the man-hours as compared to the conventional method, and greatly contributes to reducing the cost of the completed liquid crystal cell.

[Brief explanation of the drawing]

Figures 1a and b are configuration diagrams of the liquid crystal cell, Figure 2 is a working process diagram of the polarizing film bonding device according to the present invention, and Figures 3a and b are
4 is a perspective view and a cross-sectional view showing the state in which the polarizing film is held by a carrier, FIGS. 4 a to 5 are operational diagrams of the protective film peeling device, and FIGS. Figure 6a
, b, and c are configuration diagrams of the present adhesive device. 1... Liquid crystal cell body, 4... Upper polarizing film, 8... Lower polarizing film, 5, 9... Glue layer. Figure 2 Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A method for adhering a film whose surface is coated with an adhesive or an adhesive to the surface of another object, comprising: a film supply step of holding the film on a carrier; and an adhesive or adhesive for the film. It consists of a step of peeling off the protective film that protects the coated surface, and a step of adhering the film from which the protective film has been removed to the surface of another object.The film is bent into an arc shape and its restoring force 1. A method for adhering a film, characterized in that the film is carried while being held by the carrier by being attached to the two inner sides of a frame-shaped carrier so as to extend outward. 2. A method for adhering a film, wherein the film according to claim 1 is formed to have an arcuate cross section. 3. A film adhesion method, characterized in that the removal of the protective film in the protective film removal step as set forth in claim 1 is carried out using a rotating adhesive tape.