JP2006130809A - Method of manufacturing laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of laminating transported bodies continuously at angles different mutually. <P>SOLUTION: A method of producing a laminate includes a first intermittent transportation process in which a first transported body is transported intermittently along a first transportation shaft, a second transportation process in which a second transported body is transported on the first transported body synchronously with a first intermittent transportation process along a second transportation shaft of an angle different from that of the first transportation shaft, a lamination process in which regarding the first-second overlap parts for the overlap of the first and second transported bodies, parts or the wholes of them are laminated mutually, and a cutting/taking-out process in which parts of the first-second overlap parts including the first-second lamination parts laminated in the lamination process are cut and taken out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing a laminate such as a circularly polarizing plate.

  A method of laminating two or more kinds of transport bodies by laminating them is well known from the past as described in, for example, Patent Document 1 and the like, and specifically, a packaging material in which a gas barrier layer is laminated as a laminate. A flexible circuit board in which a polyimide film is laminated on a copper foil, an adhesive tape in which an adhesive sheet is laminated on a film, or a polarizing plate in which polyvinyl alcohol dyed with iodine and triacetyl cellulose are laminated is known.

  These conventional techniques will be described with reference to FIG. FIG. 1 is a schematic explanatory view showing a laminator in a conventional manufacturing method. In FIG. 1, the 1st conveyance body 1 and the 2nd conveyance body 2 are the roll-shaped thing in which the 1st conveyance body 1 and the 2nd conveyance body 2 were wound up, respectively. 5 is continuously supplied. The first transport body 1 and the second transport body 2 that are continuously supplied are stacked by rolls 7 and 8 to form a stacked body 11. With respect to this laminated body 11, the 3rd conveyance body 3 is continuously supplied from the roll-shaped thing 6, and the laminated body 11 and the 3rd conveyance body 3 are laminated | stacked with the rolls 9 and 10, and the laminated body 12 is obtained. The obtained laminate 12 is wound up as a roll 13 by a winding roll.

  As described above, the conventional bonding method has an advantage that a plurality of transport bodies can be bonded with a simple device to obtain a laminated body, but inevitably, when continuous bonding is performed, There was a restriction that the conveying directions of all the conveying bodies were the same, that is, the bonding direction of the conveying bodies had to be 0 degrees (the longitudinal directions had to be matched).

  On the other hand, in recent years, there have been many uses that require bonding at an angle other than 0 degrees, and there has been a scene where the above technique cannot be used. For example, a liquid crystalline polymer or a uniaxially stretched film has a great difference in physical properties between the film conveyance direction and the direction orthogonal thereto. When these are laminated and used, if they are all bonded in the same direction, that is, 0 degrees, curling may occur, and mechanical strength and thermal characteristics may cause a large difference in physical properties between the conveying direction and the orthogonal direction. is there. In such a case, for example, by alternately laminating at an angle of 0 degrees and 90 degrees, curling can be reduced, physical properties in the direction perpendicular to the conveyance direction can be made uniform, tear strength can be increased, etc. There are many advantages.

  In addition, it is essential to laminate a polarizing plate and a retardation film called a circularly polarizing plate by strictly controlling the bonding (lamination) angle. Performance may be reduced. In the case of such an application, conventionally, as disclosed in Patent Document 2, after the respective carriers are cut, the angles are adjusted to be a predetermined angle and bonded, or disclosed in Patent Document 3. After cutting one laminated body, the method of adjusting and bonding to a predetermined angle and then cutting the other laminated body was taken, but the angle of the single film was controlled accurately Since it was necessary to bond, there was a problem that the production capacity did not increase or the angle shifted.

Furthermore, in recent years, as the polarizing plate and the retardation film have been made thinner, there has been a problem that the handling property is lowered, so the development of a laminating method for continuously laminating each other's carriers at an angle other than 0 degrees is required. It was done.
Japanese Patent Application Laid-Open No. 2004-1236 JP-A-6-71756 Japanese Patent Laid-Open No. 11-95028

  The object of the present invention has been achieved as a result of studying the solution of the above-described problems in the prior art as an object, and provides a method for continuously producing a laminate by laminating transporters at different lamination angles. It is in.

In order to solve the above problems, a method for producing a laminate according to the present invention includes:
Is
A first intermittent conveyance step of intermittently conveying the first conveyance body along the first conveyance axis;
A second intermittent conveyance step of conveying the second conveyance body on the first conveyance body along a second conveyance axis having an angle different from that of the first conveyance axis in synchronization with the first intermittent conveyance step;
A laminating step of laminating a part or all of the first and second overlapping portions where the first transport body and the second transport body overlap each other;
A cutting and extracting step of cutting and taking out part of the 1-2 overlapping portion including the 1-2 stacking portion stacked by the stacking step;
It consists of the method characterized by having.

Here, in addition to the above manufacturing method,
Along the first conveyance axis, upstream of the second intermittent conveyance process, the third conveyance body is changed to a third conveyance axis having an angle different from that of the first conveyance axis in synchronization with the first intermittent conveyance process. A third intermittent conveyance step of conveying along the first conveyance body along,
A laminating step of laminating a part or all of the first to third overlapping portions where the first transport body and the third transport body overlap each other,
Only the third transport body of the first to third overlapping portion including the first to third stacked portions stacked by this stacking process is cut, and a part of the third transport body is left on the first transport body. It is preferable to have a cutting residue process.

Further, the second transport body and the third transport body left on the first transport body were overlapped in synchronization with the second intermittent transport process to generate the first 1-3-2 overlapping portion. After that, a laminating step of laminating the second carrier and the third carrier,
A cutting and extracting step of cutting and taking out a part of the 1-3-2 overlapping portion including the 1-3-2 laminated portion laminated by the lamination step;
It is also preferable to have.

  According to the present invention, as will be described below, it is possible to manufacture a laminated body laminated at a bonding angle other than 0 degrees with high accuracy, at high speed, simply and continuously with high productivity.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
First, the manufacturing method of the laminated body which concerns on one embodiment of this invention is demonstrated based on FIG. FIG. 2 is a schematic explanatory view showing an intermittent operation in the manufacturing method of the present invention. FIG. 2A shows the first step, and a second carrier 22 such as a retardation film is disposed at a predetermined angle θ on a first carrier 21 such as a polarizing plate. Adhesives 23 and 23 ′ are separately applied on the first transport body 21 in a predetermined shape. FIG. 2 (B) shows a state after the first transport body 21 and the second transport body 22 are intermittently operated in the directions of arrows A and B, respectively. The pressure-sensitive adhesive 23 on the first transport body 21 is positioned to form a portion 25 (1-2 overlapping portion) where the transport bodies overlap. FIG. 2C shows a state in which the target laminate 24 is cut out in the above (B). FIG. 2D shows a state after the first transport body 21 and the second transport body 22 are intermittently operated in the directions of arrows A and B from the state of (C), respectively. The next adhesive 23 ′ on the first transport body 21 is positioned under the transport body 22.

  2A and 2B, the first transport body 21 moves intermittently along the first transport axis α (first intermittent transport process) and is not shown on the upstream side thereof. The adhesive 23, the adhesive 23 ′,... Are sequentially applied at predetermined intervals by the adhesive application means. The second transport body 22 is intermittently moved along the second transport axis β at a predetermined angle θ in synchronization with the intermittent operation of the first transport body 21 (second intermittent transport). Process). This synchronization operation is performed so that the adhesive is positioned below the second conveyance body 22 for each of the first conveyance bodies 21, and the second conveyance body 22 will be described later. In addition, it is an operation that moves a certain distance so that a new (not cut out) portion is placed on the adhesive for each synchronization operation, and generates the first and second overlapping portions for each operation. .

  Next, in the state (B) described above, the first transport body 21 and the second transport body 22 are brought into contact with a pressure contact means (not shown) (for example, a pair of overlapping parts) in the overlapping portion 25 (1-2 overlapping portion). They are bonded and laminated with each other by a laminating roll or the like (lamination process). And as shown to (C), the laminated body 24 is cut out in the form including the laminated | stacked part (1-2 laminated part) (cut | disconnecting process). The laminate 24 has a structure in which a cut piece 21 ′ cut out from the first transport body 21, an adhesive 23, and a cut piece 22 ′ cut out from the second transport body 22 are stacked in this order. ing.

  Next, from the state (C), the first transport body 21 and the second transport body 22 perform the intermittent operation (synchronous operation), respectively, to the state (D), and again (B). The operation from is repeated, and the laminate is continuously manufactured.

  Another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic explanatory view showing a method for obtaining a laminated body by laminating three or more kinds of conveying bodies in the production method of the present invention. Although three types of transport bodies are illustrated in this figure, it is of course possible to sequentially stack using another transport body to obtain a stacked body in which four or more types of transport bodies are stacked. .

  In FIG. 3, a first transport body 31 such as a polarizing plate is installed so as to perform an intermittent operation (synchronous operation) in the direction of an arrow A. The three transport bodies 33 and the second transport body 32 are arranged with the angles formed by the first transport body 31 as θ1 and θ2, respectively. An adhesive 36 is separately applied in a predetermined shape on the first transport body 31, and the first transport body 31 and the third transport body 33 overlap with each other due to intermittent operation (synchronous operation). 35 (1-3 overlap portion) has occurred. The remaining portion 34 is a portion obtained by a cutting and leaving step described later, and has a configuration in which the first transport body 31, the adhesive 36, and the third transport body 33 are stacked in this order. Similarly, the second transport body 32 is arranged downstream of the third transport body 33 (in the direction of arrow A) so as to form the first 3-2-2 overlapping portion 40, and will be described later. A remaining portion 37 is formed by the remaining step. An adhesive 41 is applied to the back surface of the second transport body 32 (the surface facing the first transport body 31) at a predetermined interval. The transport body 31, the adhesive 36, the third transport body 33, the adhesive 41, and the second transport body 32 are stacked in this order.

  Next, in FIG. 3, the operation is performed on the first to third stacking process 38 in which the first transport body 31 and the third transport body 33 are stacked, and the remaining portion 34 generated by this process. Furthermore, it divides into the 1-3-2 lamination process 39 which laminates | stacks the 2nd conveyance body 32, and demonstrates below.

  The first transport body 31 is moved intermittently in the direction of the arrow A by a certain distance (the arrangement interval of the adhesive 36), and the first to third overlapping portions 35 are generated for each operation. Synchronous operation is performed with the third conveyance body 33 (third intermittent conveyance step). And in this 1-3 overlap part 35, after producing | generating a 1-3 laminated part by the press-contact means (for example, a pair of bonding roll etc.) which is not shown in figure (lamination process), in predetermined shape, Only the third transport body 33 (and the adhesive 36) is punched (hereinafter sometimes referred to as half-cut), and a remaining portion 34 is generated on the first transport body 31 (cutting and remaining step). The pressure-sensitive adhesive 36 may be applied to the back surface of the third transport body 33 (the surface facing the first transport body 31).

  After the 1-3 stacking step 38 described above, the process proceeds to a 1-3-2 stacking step 39 in which the second transport body 32 is stacked on the remaining portion 34. In this step, the first transport body 31 and the second transport body 32 perform the same intermittent operation (synchronous operation) as described above. Is generated. And about this overlapping part, the 1-3-2 lamination | stacking part was produced similarly to the above (lamination process), and only the 2nd conveyance body 32 (and adhesive 41) was punched in the predetermined shape (half). Cutting), the remaining portion 37 is generated on the first carrier (remaining cutting step).

  The intermittent operation (synchronous operation) in the above process is performed between the first transport body 31 and the third transport body 33 (1-3 stacking step), and between the first transport body 31 and the second transport body 32. (1-3-2 laminating step), it is only necessary to realize each individually, of course, if the application interval of the adhesive 36 and the adhesive 41 is the same, each of the first to third What is necessary is just to perform intermittent operation | movement (synchronous operation | movement) with conveyance bodies integrally, and the manufacturing efficiency of a laminated body improves remarkably in this case.

  In addition, in FIG. 3, a part of the case where a laminate is obtained by laminating three or more types of conveyance bodies has been described, but if a laminate obtained by laminating three types of conveyance bodies is obtained, the above In the first 1-3-2 laminating step 39, a laminated body may be obtained by punching out all of them without half-cutting.

As mentioned above, although each embodiment of this invention was demonstrated based on FIG. 2 and FIG. 3, of course, this invention is not necessarily limited to these.
For example, although the polarizing plate was illustrated about the 1st conveyance bodies 21 and 31, as an application example, a phase difference film, an optical compensation film, a viewing angle expansion film, a reflecting plate, a diffusion plate, a light guide plate, privacy An anisotropic film such as a filter, a plastic substrate with a retardation function, a plastic substrate with an optical compensation function, a laminate having one or more layers of these anisotropic films, or a plastic liquid crystal holding a liquid crystal substance in an isotropic film A cell, a liquid crystalline optical compensation film, or the like can be used.

  The second transport bodies 22 and 32 and the third transport body 33 are anisotropic such as a polarizing plate, a retardation film, an optical compensation film, a viewing angle widening film, a reflecting plate, a diffusion plate, a light guide plate, and a plastic substrate. A liquid crystal cell, a laminate having one or more of these anisotropic films, a plastic liquid crystal cell in which a liquid crystal substance is held in an isotropic film, a liquid crystalline optical compensation film, or the like can be used.

  The intermittent operation (synchronous operation) of each carrier can be performed by intermittently driving a take-up roll (not shown) of the carrier. At this time, by providing a sprocket hole at the end of the transport body or arranging a marker by printing or the like, it is possible to precisely control the transport distance and improve the manufacturing efficiency and quality of the laminate. it can.

  Further, in the above-described laminating process according to the present invention, punching or half-cutting is performed while leaving the edge portion of the transport body, thereby enabling handling (intermittent operation, synchronous operation, winding, etc.) of the transport body. However, when the edge portion is cut due to some process trouble, there arises a problem that the transport body cannot be transported. For this reason, it is effective to reinforce the edge portion. As a method for reinforcing the edge portion, a method of sticking the protective film on the edge or the whole of the carrier, a method of holding the edge with a clip, a method of increasing the thickness of the edge during film formation, and the like can be suitably used.

  Moreover, when sticking a protective film on the whole conveyance body, since the film shape after a lamination process does not become only an edge by performing the half cut which cuts only a conveyance body and does not cut a protection film before a lamination process Since the frequency with which the film breaks due to a process trouble can be reduced, this is a preferred embodiment.

  In the present invention, when an optical compensation film such as a retardation film is used, its optical characteristics may change due to tension. For this reason, it is preferable to reduce a tension | tensile_strength in a lamination position, or hold | maintain a tension-free state if possible. Examples of the method for reducing the tension include a method of holding the transport body with a roll or the like and absorbing the tension before and after the transport body and a method of protecting the transport body by providing a high-strength protective film.

  In the present invention, it is important that the transport body is continuously supplied by an intermittent operation, which makes it possible to obtain a laminated body continuously with high accuracy. The method of continuously supplying the transport body is not particularly limited, but a so-called Roll to Roll method of transporting a roll-shaped transport body in a transport apparatus having a winding unit and a winding unit, and a constant length. For example, a method of feeding the cut conveyance body with a conveyance device such as a chain clip, a robot arm, or a sheet feeder. The method of continuously supplying the carrier should be properly used depending on the application, but the roll-to-roll method is simple and preferable because the material loss is small.

  In addition, when using a delivery method such as a chain clip, robot arm, or sheet feeder, a roll-shaped transport body is continuously supplied until immediately before the transport apparatus, and at least a part of the transport body is held in the transport apparatus. After that, it is important to proceed to a process such as cutting. When a sheet carrier that has been cut first is used, an angle shift may occur when the sheet is held by the conveyor.

  Examples of the cutting method include punching using a mold such as a Thomson blade, punching using a laser, cutting using a moving blade, cutting using a diamond blade, etc., but punching using a mold is preferably used. The cutting shape is preferably a quadrangular shape or a polygonal shape because the loss of the conveying member is small. In this case, it is preferable that the corner is not an acute angle but a rounded shape. When punched at an acute angle, the edge may be broken from the corner. However, when the edge has sufficient strength, an acute angle is preferable because there is less loss of the conveyance body.

  Examples of the cutting include a method of separating the entire laminated body from the transport body, and a method of leaving a part on the transport body by controlling the punching depth (half cut). In the case of using a so-called “half-cut” method in which the stacked body is left on any one type of transport body, for example, in a state where a part of another transport body is stacked on the first transport body 21, 31. Since it can be transported, it is easy and accurate when stacking other transport bodies repeatedly, when using the obtained stack continuously in the next processing step, or when cutting chips directly from the roll shape to the use size. It is advantageous because it can be conveyed to Moreover, when cut | disconnecting completely, it is good to convey a laminated body by the other conveyance body which has functions, such as a vacuum suction and adhesion.

  In the present invention, “lamination” is a method of fixing two or more transporters in close contact with each other, and examples thereof include bonding, adhesion, adhesion, adhesion, fusion bonding, thermocompression bonding, and the like. As an example of the bonding, the bonding method in which the pressure-sensitive adhesive is pressure-bonded with a roll has been described with reference to FIGS. 2 and 3, but the lamination method is not limited thereto. In addition, in the case of lamination using an adhesive or a pressure-sensitive adhesive, it may be performed by normal pressure or pressure bonding while heating, or irradiation with active energy rays.

  Adhesives used for bonding include (meth) acrylate and oxetane monomer / oligomer adhesives, urea resin, melamine resin, phenol resin, resorcinol resin, epoxy, polyurethane resin Resin adhesives such as vinyl acetate resin, polyvinyl alcohol resin, acrylic resin, cellulose resin, chloroprene, nitrile rubber, styrene butadiene rubber, styrene block copolymer thermoplastic elastomer, butyl rubber, Natural rubber-based, recycled rubber-based, chlorinated rubber-based, rubber-based adhesives such as silicone rubber-based adhesives, natural adhesives such as glue and starch-based adhesives, etc. can be used. The pressure-sensitive adhesive used for the pressure-sensitive adhesive is a kind of adhesive generally called a pressure-sensitive adhesive. Specific examples include (meth) acrylate, oxetane, styrene butadiene rubber, butyl rubber, natural rubber, silicone rubber, polyisoprene, polybutene, polyvinyl ether, acrylic resin, and polyester. It is done. Using these adhesives or pressure-sensitive adhesives, they can be bonded by normal pressure or pressure bonding while heating, or by light irradiation.

  Among these adhesives or pressure-sensitive adhesives (hereinafter referred to as “viscous / adhesives”), (meth) acrylate-based, oxetane-based, acrylic resin-based, polyester-based, and epoxy-based adhesives / adhesives are preferable, and (meth) acrylate is most preferable. -Based, acrylic resin-based, and polyester-based adhesives / adhesives. These adhesives / adhesives are preferred because of their high transparency and good weather resistance. Of course, it goes without saying that these adhesives / adhesives are appropriately selected depending on the material of the carrier.

  Examples of the adhesive / adhesive application method include roll coater, bar coater, die coater, spray gun, flexographic printing, screen printing, and transfer of an adhesive sheet. As described above, when the adhesive area is made smaller than the area of the laminate to be cut, flexographic printing and screen printing that can be applied intermittently, or transferring an adhesive sheet that has been cut into a predetermined area in advance. It is preferable. The adhesive / adhesive can be applied to either one or both of the transport bodies in advance, or can be performed immediately before the lamination, but it is possible to prevent misalignment if performed near the lamination position. preferable. Depending on the type of adhesive / adhesive, drying or chemical reaction by heating or light irradiation may be required before lamination in order to exhibit sufficient adhesion performance. In this case, a light irradiation type adhesive / adhesive is preferred from the viewpoint of space saving and productivity.

  Moreover, when a conveyance body is a thermoplastic base material, it can also laminate | stack by fuse | melting, heating.

  In the present invention, there are no particular limitations on the type of carrier to be laminated, but preferably 2 to 10 types, more preferably 2 to 3 types. As the number of types of transporting bodies to be stacked increases, the efficiency is improved, but a large number of transporting mechanisms are required, and problems such as bubbles entering during stacking and insufficient adhesion may occur.

  The conveyance axis can be arbitrarily determined depending on the application, but specific examples include the following. In a circularly polarizing plate in which a polarizing plate and a quarter wavelength retardation film are laminated, it is preferable that the slow axis of the retardation film is 45 ° ± 15 ° with respect to the transmission axis of the polarizing plate. More preferably, the retardation film has a slow axis of 45 ° ± 5 °. In addition, in a circularly polarizing plate in which a polarizing plate, a half-wave retardation film, and a quarter-wave retardation film are laminated, the slow axis of the half-wave retardation film is 15 ° with respect to the transmission axis of the polarizing plate. The slow axis of the ± 15 °, ¼ wavelength retardation film is preferably 75 ° ± 15 °. More preferably, the slow axis of the half-wave retardation film is 15 ° ± 5 °, and the slow axis of the quarter-wave retardation film is 75 ° ± 5 °. When an anisotropic material such as a liquid crystal polymer is laminated to improve the strength, 90 ° is preferable when the number of layers is an even number, and 60 ° is preferable when the number of layers is three. Therefore, in the present invention, for example, the angles θ, θ1, and θ2 in FIGS. 2 and 3 may be appropriately adjusted so that the above-described angles can be realized.

  In the present invention, the first transport bodies 21 and 31 are preferably transported in a fixed state at a predetermined angle (for example, 0 degrees). On the other hand, it is preferable to transport a transport body other than the first transport bodies 21 and 31 using a transport apparatus that can be set at an arbitrary angle depending on the target laminate. This transport method is not particularly limited, and examples thereof include a method of adjusting the angle by moving on a circular rail as shown in FIG.

  In FIG. 4, the conveyance axis of the first conveyance body 51 is fixed to the axis indicated by α. On the other hand, the transport axis β of the second transport body 52 can be controlled at an arbitrary angle. The roll 53 and the take-up roll 54 of the second transport body 52 are installed on a circular rail 55. The second conveyance body 52 controls the conveyance axis β by moving on the circular arc of the circular rail 55 together with the roll-shaped object 53 and the take-up roll 54. Thus, it becomes easy to manufacture a laminated body continuously by supplying each conveyance body with the roll which wound up the conveyance body.

In the present invention, it is important to continuously perform “lamination”, “bonding”, “cutting”, and “removing the laminate” at the lamination position. For this reason, the following mechanism is suitable for the stacking position. By performing it at the stacking position, the installation area required for the apparatus can be reduced.
(1) During lamination, the cutting blade and the cutting plate are retracted in the horizontal direction or the vertical direction.
(2) After laminating and bonding, the bonding address plate and the bonding roll are retracted in the horizontal direction.
(3) Take out the laminate. However, in the case of half cut, it is taken out by the carrier.

  In the present invention, in order to improve productivity, “lamination”, “bonding”, “cutting”, and “removing the laminate” may be continuously performed at different positions. By performing each step at a different position, the time for one cycle of intermittent operation can be shortened, so that productivity is improved. As a specific manufacturing method, in FIG. 3, a process of performing a half cut in which a protective film is applied to the entire surface of the second and / or third transport body, and only the transport body is cut and the protective film is not cut, A step of moving one transport body and / or the second transport body and / or the third transport body to the stacking position by intermittent operation (synchronization), the first transport body and the second transport body or the third transport Examples of the step of laminating the body and the method of continuously producing the laminate by the step of taking out the portion laminated by the lamination step (1-2 and / or 1-3 laminate portion) by the first transport body it can.

  Furthermore, since it becomes impossible to drive if the edge portion is laminated after cutting, a technique for laminating only the inside of the laminated body to be cut is necessary. As this method, for example, the adhesion area is made smaller than the area of the laminate to be cut.

  A polarizing plate has a function of selectively transmitting natural light, that is, linearly polarized light in one direction from a non-polarized light beam. For example, an iodine polarizing plate, a dye polarizing plate, a reflective polarizing plate, and these A laminated body can be illustrated.

  The retardation film is a substance having a difference in the transmission speed of light in the direction perpendicular to the transport direction and the transport direction, and the thickness of the retardation film is preferably 0.1 to 200 μm. More preferably, it is 1-20 micrometers, Most preferably, it is 2-10 micrometers. When the thickness is less than 0.1 μm, the phase difference may change due to the stress during conveyance. Moreover, since it will be excellent in the handleability in a single board when it exceeds 200 micrometers, there are few advantages which use the lamination method of this invention. In addition, the optical laminate is required to be thin and light, but a thick retardation film exceeding 200 μm is not preferable because it causes the laminate to be thick and heavy. Examples of the material of the retardation film include polycarbonate, polyethylene, polypropylene, polyolefin such as cyclic polyolefin, aramid, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polyarylate, polyamide, and the like. When focusing on thinning, aramid is preferable. Aramid is preferable because it has extremely high mechanical strength, has good handling properties when used as a thin film retardation film, and has little change in retardation with respect to stress during transportation.

  Examples of the optical compensation film include a viewing angle improving film, a privacy film, and a brightness improving film. The retardation film is also a kind of optical compensation film in a broad sense.

The present invention will be described more specifically with reference to the following examples.
The measurement method of physical properties and the evaluation method of effects in the present invention were performed according to the following methods.

(1) Ellipticity Measured using an automatic birefringence meter KOBRA-21ADH manufactured by Oji Scientific Instruments. The phase difference at 550 nm was approximated using the Cauchy equation.

Example 1
A device having the continuous laminating mechanism shown in FIG. 2 and further continuously laminating the carriers 31, 32, and 33 as shown in FIG. 3 is manufactured, and a polarizing plate manufactured by Sumitomo Chemical Co., Ltd. The first carrier 31, an aramid λ / 2 retardation film (width 30 cm, thickness 8 μm, lamination angle 15 degrees (with respect to the transmission axis of the polarizing plate)) manufactured by Toray Industries, Inc., the third carrier 33, Toray Aramid λ / 4 retardation film (width 30 cm, thickness 8 μm, lamination angle 75 degrees (relative to the transmission axis of the polarizing plate)) manufactured by Co., Ltd. was used as the second carrier 32, and pressure sensitive adhesive SK dyne manufactured by Soken Chemical It laminated | stacked and bonded using 2065. One worker obtained 30 laminates of 15 cm × 15 cm per hour. None of them contained wrinkles, and all obtained good laminates. The ellipticity at a light wavelength of 550 nm was 98%.

Example 2
A UV-curable adhesive ARONTAC UVA-2101 manufactured by Toagosei Co., Ltd. was applied to a polyethylene terephthalate (PET) film having a thickness of 100 μm at a coating temperature of 80 ° C. with a bar coater. Then, ultraviolet irradiation was performed using the ultraviolet irradiation apparatus to which the D bulb made from Fusion UV Systems Japan was attached. The integrated light quantity was 1,200 mJ / cm ² (313 nm). Further, a pressure-sensitive adhesive sheet 1 was prepared by laminating a PET film having a thickness of 100 μm on the pressure-sensitive adhesive surface.

  The adhesive was transferred to a polarizing plate using the obtained adhesive sheet 1 instead of the adhesive SK Dyne 2065 manufactured by Soken Chemical Co., Ltd., and the same lamination and bonding as in Example 1 was performed. One worker obtained 30 laminates of 15 cm × 15 cm per hour. None of them contained wrinkles, and all obtained good laminates. The ellipticity at a light wavelength of 550 nm was 98%.

Comparative Example 1
All materials were cut out from the roll with a film cutting machine PAC-F-10t manufactured by DITEX, and the same materials as in Example 1 were laminated and bonded using a bonding machine HAL-430CCD manufactured by HALTEC. Two workers obtained 5 laminates of 15 cm × 15 cm in 4 hours. Two of the five sheets were confirmed to be wrinkled and lifted at the edges. The ellipticity at a light wavelength of 550 nm was 95%.

It is a schematic sectional drawing of the conventional laminator. It is a schematic plan view which shows the manufacturing method of the laminated body which concerns on one embodiment of this invention. It is a schematic plan view which shows the manufacturing method of the laminated body which concerns on the other embodiment of this invention. It is a schematic plan view which shows the bonding angle control mechanism in the manufacturing method of the laminated body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st conveyance body 2 2nd conveyance body 3 3rd conveyance body 4 1 roll-like thing 5 2 roll-like thing 6 3 roll-like thing 7 roll 8 roll 9 roll 10 roll 11 1st conveyance body And a laminated body of the second conveying body 12 a laminated body of the first conveying body, the second conveying body and the third conveying body 13 a roll-shaped object 21 a first conveying body 21 ′ cut out from the first conveying body Cut part
22 2nd conveyance body 22 'The part cut off from the 2nd conveyance body 23 Adhesive 23', 23 '', 23 '''Adhesive 24 Laminated body 25 1-2 1-2 overlapping part 31 1st conveyance body 32 Second transport body 33 Third transport body 34 Remaining portion 35 1-3 overlapping portion 36 Adhesive 37 Remaining portion 38 1-3 stacking step 39 1-3-2 stacking step 40 1-3-3 2 overlapping portions 41 Adhesive 51 First transport body 52 Second transport body 53 Rolled material of second transport body 54 Winding roll 55 Circular rail

Claims (7)

A first intermittent conveyance step of intermittently conveying the first conveyance body along the first conveyance axis;
A second intermittent conveyance step of conveying the second conveyance body on the first conveyance body along a second conveyance axis having an angle different from that of the first conveyance axis in synchronization with the first intermittent conveyance step;
A laminating step of laminating a part or all of the first and second overlapping portions where the first transport body and the second transport body overlap each other;
A cutting and extracting step of cutting and taking out part of the 1-2 overlapping portion including the 1-2 stacking portion stacked by the stacking step;
The manufacturing method of the laminated body characterized by having. Along the first conveyance axis, upstream of the second intermittent conveyance process, the third conveyance body is changed to a third conveyance axis having an angle different from that of the first conveyance axis in synchronization with the first intermittent conveyance process. A third intermittent conveyance step of conveying along the first conveyance body along,
A laminating step of laminating a part or all of the first to third overlapping portions where the first transport body and the third transport body overlap each other,
Only the third transport body of the first to third overlapping portion including the first to third stacked portions stacked by this stacking process is cut, and a part of the third transport body is left on the first transport body. The manufacturing method of the laminated body of Claim 1 which has a cutting | leaving residue process. The second transport body and the third transport body left on the first transport body are overlapped in synchronism with the second intermittent transport process to generate the 1-3-2 overlapping portion, A laminating step of laminating the second carrier and the third carrier,
A cutting and extracting step of cutting and taking out a part of the 1-3-2 overlapping portion including the 1-3-2 laminated portion laminated by the lamination step;
The manufacturing method of the laminated body of Claim 2 which has these.   The manufacturing method of the laminated body of Claim 2 or 3 whose 1st conveyance body is a polarizing plate or a display substrate, and a 2nd and 3rd conveyance body is a phase difference film and / or an optical compensation film.   The polarizing plate is used as the first transport body, the retardation film is used as the second and third transport bodies, the angle formed by the first transport shaft and the third transport shaft is 15 °, The manufacturing method of the laminated body in any one of Claims 2-4 which makes the angle | corner which a conveyance axis and a 2nd conveyance axis make 75 degrees.   The manufacturing method of the laminated body in any one of Claims 1-5 which performs a lamination process using an adhesive or an adhesive agent.   The manufacturing method of the laminated body in any one of Claims 1-6 with which all the conveyance bodies are supplied with a roll.

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