JPH10180862A - Method and apparatus for bending synthetic resin plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending method and a device for bending a synthetic resin plate to prevent a whitening phenomenon, a crack or the like from occurring in the synthetic resin plate without heating when bending the synthetic resin plate. SOLUTION: A corrugating step of elastically deforming the synthetic resin plate 2 to form corrugated irregularities on the synthetic resin plate 2, and forming a predetermined mold corresponding to the irregularities on the elastically deformed synthetic resin plate 2. And fixing step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for bending a synthetic resin plate, and more particularly to a method and an apparatus for bending a synthetic resin plate to form irregularities.

[0002]

2. Description of the Related Art As a conventional method of bending a synthetic resin plate, there is, for example, a cold bending method of processing a synthetic resin plate without heating. The cold bending method includes a method using a press and a method using a roller.

[0003] A method of bending a synthetic resin plate by pressing is a method in which a first press tool having a recess formed therein and a protrusion complementary to the recess of the first press tool are formed, and the first press tool is paired with the first press tool. The synthetic resin plate is sandwiched between the second press tool and the second press tool, and the synthetic resin plate is pressed to bend into the uneven shape.

[0004] On the other hand, a method of bending a synthetic resin plate using a roller includes a first roller having a concave portion, a convex portion complementary to the concave portion of the first roller, and a first roller having a concave portion. A synthetic resin plate is sandwiched between a pair of second rollers, and the synthetic resin plate is bent into the uneven shape.

[0005] A cold bending method using this roller is as follows.
It is possible to bend the synthetic resin plate continuously and it is an efficient method, but the stress applied to the synthetic resin plate is large,
There are problems such as whitening of the bent portion, generation of cracks, and brittleness.

[0006] Further, as a cold bending method using a roller, a method of sequentially bending the synthetic resin plate from the center to both ends, a method of simultaneously bending all portions of the synthetic resin plate, and gradually dividing the product into a plurality of steps, While narrowing the width toward the center, increasing the depth of the mold, and bending it into a desired shape. Also in this case, since the synthetic resin plate is sharply bent, a large stress is generated when the synthetic resin plate is engaged with the roller, and a force for stretching the synthetic resin plate is applied in addition to the bending force.

On the other hand, a cold bending method using a press is also known.
There is a similar problem. In this method using a press, a synthetic resin plate is bent by heating. However, automation cannot be performed, and there is a problem that productivity is low.

In order to solve these problems, Japanese Patent Publication No. 7-84030 discloses a method of using a roller and bending a synthetic resin plate by heating.

[0009]

However, the conventional example disclosed in Japanese Patent Publication No. 7-84030 is a method in which a synthetic resin plate is heated and bent. In the bending method, the above problem could not be solved.

Therefore, the present invention can reduce the stress applied to a synthetic resin plate without heating it when bending the synthetic resin plate, and can damage the synthetic resin plate such as whitening and cracks. It is an object of the present invention to provide a method and an apparatus for bending a synthetic resin plate, which can prevent the occurrence of the bending.

[0011]

In order to achieve this object, the present invention provides a method for bending a synthetic resin plate, wherein the synthetic resin plate is bent to form irregularities on the synthetic resin plate. A corrugating step of elastically deforming the plate to form corrugations on the synthetic resin plate, and a shaping step of fixing a predetermined mold corresponding to the irregularities on the elastically deformed synthetic resin plate. And a method for bending a synthetic resin plate.

According to this method, when the synthetic resin plate is bent by the forming device, the synthetic resin plate is elastically deformed by a corrugating device in advance into a shape close to a waveform to be obtained later. Therefore, since this synthetic resin plate is not bent sharply, it is possible to prevent the synthetic resin plate from being damaged, such as a whitening phenomenon or a crack, as in the related art.

The corrugating step includes a step of clamping each of the front and back surfaces of the synthetic resin plate at predetermined intervals in a width direction of the synthetic resin plate, and a pair of adjacent clamping positions. Forming a central portion of the concave portion, and moving the pinched portion so that the other clamping position forms the central portion of the convex portion to elastically deform the synthetic resin plate, The molding step may include a step of bending a predetermined position near the center of the concave and convex portions of the synthetic resin plate along the concave and convex shape.

In the corrugating step, the width direction ends of the synthetic resin plate are pressed and moved in a direction in which the ends approach each other.
The method may further include a moving step.

The synthetic resin plate is sandwiched between the front and back surfaces of the synthetic resin plate so as to be movable in the width direction of the synthetic resin plate and in a direction perpendicular to the front and back surfaces of the synthetic resin plate. The elastic deformation is performed by moving the pressing roller holding the synthetic resin plate toward the center in the width direction, and pressing one of the pressing rollers adjacent to each other on the back surface of the synthetic resin plate. Side, and the other pressing roller is moved to the front side of the synthetic resin plate.

[0016] The elastic deformation step may include a step of regulating a position of the synthetic resin plate between the adjacent holding positions. Thus, it is possible to prevent the synthetic resin plate from being excessively curved, and to perform a more accurate bending process.

Further, the present invention relates to a synthetic resin plate bending apparatus for forming irregularities on the synthetic resin plate by bending the synthetic resin plate, wherein the predetermined irregularities are formed on the synthetic resin plate. A corrugating device for elastically deforming the synthetic resin plate; and a shaping device disposed on an output side of the corrugating device and fixing a predetermined mold corresponding to the irregularities on the synthetic resin plate supplied from the corrugating device. And a device for folding a synthetic resin plate.

[0018] The corrugating device is disposed on both sides in the width direction of the synthetic resin plate so as to be in contact with both ends of the synthetic resin plate, and is movable in the width direction of the synthetic resin plate. A pair of width determining rollers, a first pressing roller disposed on the front surface side of the synthetic resin plate and arranged at a predetermined distance from each other in a width direction of the synthetic resin plate, and the synthetic resin plate. And a second pressing roller which is disposed at a position facing the respective first pressing rollers on the back side of the first pressing roller and forms a pair with the first pressing roller. The roller and the second pressing roller can be configured to be movable in the width direction of the synthetic resin plate and in a direction perpendicular to the front and back surfaces.

Further, a plurality of the first pressing roller, the second pressing roller and the width determining roller are further provided in the traveling direction of the synthetic resin plate, and a plurality of the first pressing rollers disposed in the traveling direction. The pressing roller, the second pressing roller, and the width determining roller can perform the same movement in each of the same rows.

The molding device includes a first molding roller provided on a front surface side of the synthetic resin plate and opposed to a concave portion of the synthetic resin plate;
A second portion provided at a position facing the convex portion of the synthetic resin plate;
A molding roller, on the back side of the synthetic resin plate,
A second molding roller which is provided at a position facing the first molding roller provided on the front surface side, and which forms a pair with the first molding roller; and a second molding roller provided on the back surface side and provided on the front surface side. A first molding roller provided at a position facing the second molding roller, and a first molding roller paired with the second molding roller, wherein the second molding roller is provided at both ends of the outer peripheral surface at the end side. The first molding roller may be configured to fit between both edges of the second molding roller, with a convex edge having an inclined surface that gradually widens toward the second molding roller.

Further, a driving device for rotating these rollers may be connected to the first molding rollers.

Preferably, the peripheral speed of the rotation of the first molding roller is set to 1 m / min or more and 25 m / min or less, more preferably 5 m / min or more and 20 m / min or less. .

The position of the synthetic resin plate is restricted between the first molding roller and the second molding roller adjacent to the first molding roller on both front and back sides of the synthetic resin plate. A regulating roller can be provided.

As the synthetic resin plate used in the present invention, polycarbonate, polyvinyl chloride, acrylic resin, FRP and the like are used. In particular, a polycarbonate resin having excellent low-temperature impact resistance is preferably used.
Specifically, at a temperature of about 0 ° C. to 35 ° C., this resin has a property that whitening, cracking, and the like are less likely to occur during processing such as bending. Further, it is desirable to provide a layer having excellent weather resistance on at least one surface of the polycarbonate resin plate. As such a layer, for example,
A resin having a thickness of 20 to 100 μm and an ultraviolet absorbent added to an acrylic resin, or a polycarbonate resin having an ultraviolet absorbent added thereto is preferable, and the latter is particularly preferable. For the purpose of preventing the front and back surfaces from being damaged, a film or the like having an appropriate thickness may be attached to the synthetic resin plate.

The thickness of the synthetic resin plate is preferably 5 mm or less, more preferably 0.4 mm or more and 3.0 mm or less.

The length of the synthetic resin plate is usually 1 to 1
It is about 5m. It may be more or less. The above-described corrugating and molding steps can also be automated by employing appropriate sequence control or numerical control.

[0027]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a synthetic resin plate bending apparatus according to an embodiment of the present invention (however, a part of a housing is omitted for easy understanding of the configuration of a pressing roller and a width determining roller. FIG. 2 is a front view of the corrugating device shown in FIG. 1, and is a schematic view showing a state before corrugating the synthetic resin plate. FIG. 3 is a front view of the corrugating device shown in FIG. Fig. 4 is a schematic view showing a state when corrugating a synthetic resin plate, Fig. 4 is a schematic front view showing a main part of the molding device shown in Fig. 1, and Fig. 5 is a folded synthetic resin plate. FIG. 6 is a partially enlarged view of FIG.

In the present embodiment, the width direction of the synthetic resin plate inserted into the synthetic resin plate bending device is defined as "left and right",
The front side may be described as “upper” and the back side may be described as “lower”.

In this embodiment, five pairs (five pairs) of rollers are shown. However, in practice, many pairs of rollers may be used. Become.

As shown in FIGS. 1 to 4, a synthetic resin plate bending device 1 according to the present embodiment is a corrugating device 3 for elastically deforming a synthetic resin plate 2 inserted substantially horizontally into a wave shape.
And a shaping device 6 arranged on the output side of the corrugating device 3 and fixing a predetermined mold on the elastically deformed synthetic resin plate 2 carried out from the corrugating device 3.

As shown in FIGS. 1 to 3, the corrugating device 3 includes width determining rollers 31R and 31L disposed at positions which can be brought into contact with both ends of the synthetic resin plate 2 inserted substantially horizontally.
And a plurality of first dies disposed on the front side of the synthetic resin plate 2 and spaced from each other by a predetermined distance in the width direction of the synthetic resin plate 2.
And the first pressing rollers 32A to 32E on the back side of the synthetic resin plate 2 and the pressing rollers 32A to 32E.
The first pressing roller 32A is disposed at a position facing the first pressing roller 32A.
-Pressing rollers 33A to 33E forming a pair with the second pressing rollers 33A to 33E
And is provided.

The width determining rollers 31R and 31L are provided on the outside of these, and the slide portions 36R movably arranged on the lower frame 40D and the upper frame 40U of the housing 30 so as to be movable left and right.
And 36L, so that it can be freely moved left and right. The slide units 36R and 36L are moved and stopped by a driving device (not shown).

The width determining rollers 31R and 31L are provided so as to be rotatable in the traveling direction of the synthetic resin plate 2 and to be movable in the left and right directions by the rotation of the rotating shafts 35R and 35L. That is, the width determining roller 31
R and 31L can adjust the width of the synthetic resin plate 2 by moving both ends of the synthetic resin plate 2 toward each other, thereby pressing and moving both ends of the synthetic resin plate 2 in that direction. . The width determining rollers 31R and 3R
1L can also move in a direction in which both move away from each other. The outer peripheral surfaces of the width determining rollers 31R and 31L have a uniform curved shape like a normal roller.

In the present embodiment, the eight width determining rollers 31 are arranged at a predetermined interval (200 mm in the present embodiment) from each other in the traveling direction (length direction) of the synthetic resin plate 2.
R and 31L were provided.

Eight first pressing rollers 32A to 32E are respectively disposed at predetermined intervals in the traveling direction of the synthetic resin plate 2 by supporting portions 34A to 34E disposed above the first pressing rollers 32A to 32E. And is rotatably supported in the traveling direction of the synthetic resin plate 2. The disposition positions of the eight first pressing rollers 32A to 32E in each row are set so as to correspond to the width determining rollers 31R and 31L. Also, the outer peripheral surfaces of the first pressing rollers 32A to 32E have a uniform curved surface shape like a normal roller.

The support portion 34C is connected to the right frame 4 of the housing 30.
It is fixed to a rail portion 37 provided horizontally at a position above the support portion 34C of the OR and the left frame 40L.
The support portions 34A and 34E are provided on the rail portion 37 so as to be movable left and right by a driving device (not shown). Specifically, the support portions 34A and 34E are provided with, for example, wheels and pinions (not shown).
It can be designed to move left and right.

The rail portion 37 is installed on the right frame 40R and the left frame 40L so that it can move up and down to some extent. Thereby, for example, when the synthetic resin plate 2 is inserted / installed, the first pressing rollers 32A, 32C and 32E and the second pressing rollers 33A, 33C and 3
The distance to 3E can be adjusted.

On the other hand, the support portions 34B and 34D are mounted on a rail portion 41 which is horizontally mounted on the right frame 40R and the left frame 40L of the housing 30 so as to be disposed above the rail portion 37 and which can move in the vertical direction. And a drive unit (not shown) (similar configuration to the support units 34A and 34E). The rail portion 41 is moved and stopped by a driving device (not shown).

With this structure, the support portions 34B and 34B
D, the first pressing rollers 32B and 32D
The first pressing roller 32, as shown in FIG.
A, 32C and 32E can be moved upward.

The first pressing rollers 32A to 32E
The same movement is performed for each row of the synthetic resin plate 2 in the same traveling direction.

The second pressing rollers 33A to 33E have the same configuration as the first pressing rollers 32A to 32E.
The support portions 39A to 39E disposed below these are disposed at positions facing the first pressing rollers 32A to 32E.

The support portion 39C includes a right frame 40R and a left frame 40R.
L is fixed to a horizontally movable rail portion 43 provided below the support portion 39C. Further, the support portions 39A and 39E are provided on the rail portion 43 which can move to some extent in the same manner as the support portions 34A and 34E so as to be movable left and right.

On the other hand, the supporting portions 39B and 39D are disposed below the rail portion 43, and are mounted on a rail portion 44 which is vertically movable by a driving device (not shown) (supporting portions 34A and 34D).
4E) so as to be movable left and right. The rail unit 44 is moved and stopped by a driving device (not shown).

With this structure, the support portions 39B and 39B
D holding rollers 33B and 33D supported by
As shown in FIG. 3 in particular, the second pressing roller 33
A, 33C and 33E can be moved upward.

As shown in FIGS. 1, 4 and 6, the molding device 6 is provided on a front side of the synthetic resin plate 2 and at a position opposed to the concave portion 4 of the synthetic resin plate 2. The molding rollers 61A to 61C, the second molding rollers 62A and 62B provided on the front surface side at positions facing the convex portions 5 of the synthetic resin plate 2, and the rear surface side of the synthetic resin plate 2 Are provided at positions facing the first molding rollers 61A to 61C, and the first molding rollers 61A to 61C are provided.
And second molding rollers 62A and 62B on the back side.
And the second molding roller 6
The first molding rollers 61D and 61E are paired with 2A and 62B. However, the second rollers 62 </ b> A and 62 </ b> B are
2C to 62E are rotatable with respect to the rotation shaft 72, respectively.

The concave portion 4 and the convex portion 5 of the synthetic resin plate 2
As shown in FIG. 5, when viewed from the front side (upper surface side) of the synthetic resin plate 2, the back side of the convex portion 5 becomes the concave portion 4, and the concave portion 4
Has a relationship that the back side of the convex portion 5 becomes the convex portion 5.

The first molding rollers 61A to 61C and the second rollers 62A and 62B are alternately arranged on the rotating shaft 71 every other one. The first molding rollers 61D and 61E and the second rollers 62C to 62E are
Every other one is alternately arranged on the rotating shaft 72. The rotating shafts 71 and 72 are connected to a driving device 73 for rotating and stopping these.

A roller provided on the rotating shaft 71,
The rollers arranged on the rotating shaft 72 have the same configuration except that the order of arrangement is reversed.
The rollers disposed on the rotating shaft 71 will be described in detail.

The first molding rollers 61A to 61C are designed to have a larger diameter than the second molding rollers 62A and 62B. This difference in diameter is determined by the height H of the unevenness of the synthetic resin plate 2 (see FIG. 5).

The second molding rollers 62A and 62B are
In particular, as shown in FIG. 6, at both ends of the outer peripheral surface 63, a convex edge 65 having an inclined surface 64 gradually expanding toward the end is formed. The inclination angle of the inclined surface 64 is set so as to correspond to the bending angle α of the synthetic resin plate 2 (see FIG. 5). Is usually set to an acute angle (90 degrees or less) so that the synthetic resin plate has a sharp inclination angle. The second molding rollers 62A and 62B abut on the top of the convex portion 5 of the synthetic resin plate 2 and rotate.

The first molding rollers 61A to 61C have a length substantially equal to the width of the outer peripheral surface 63 of the second molding rollers 62A and 62B (the distance between both edges 64). The first molding rollers 61A to 61C rotate with the synthetic resin plate 2 sandwiched between the first molding rollers 61A to 61C. That is, the synthetic resin plate 2 comes into contact with the top of the concave portion 4 and rotates.

The space between the first molding roller 61A and the second molding roller 62A is brought into contact with the surface of the synthetic resin plate 2 passing therethrough and rotates to regulate the position of the synthetic resin plate 2. A regulating roller 81 and a similar regulating roller 82 that rotates in contact with the back surface side are provided.

As shown in FIG. 4, these regulating rollers 81 and 82 are similarly arranged between the other rollers.

Next, a specific operation of the synthetic resin plate bending apparatus 1 having this configuration will be described. In this embodiment, a polycarbonate plate having a thickness of 2.0 mm, a width of 930 mm, and a length of 2500 mm, which is formed by laminating an acrylic resin film having a thickness of 50 μm to which an ultraviolet absorber is added on one side, is used as the synthetic resin plate 2. The case where it is used will be described.

First, the synthetic resin plate 2 is inserted from the entrance side of the corrugating device 3, and the first pressing rollers 32A to 32E are
After passing between the second pressing rollers 33A to 33E, the front end of the synthetic resin plate 2 is taken out from the exit side. At this time, the first pressing rollers 32A to 32E and the second pressing rollers 33A to 33E
33E hold the same horizontal position. The width determining rollers 31R and 31L are located outside the width of the synthetic resin plate 2.

Next, the rail portion 37 is lowered and the first
A predetermined position of the synthetic resin plate 2 is sandwiched between the pressing rollers 32A to 32E and the second pressing rollers 33A to 33E.

Next, the slide portions 36R and 36L are gradually moved in a direction approaching each other, and the width determining rollers 31R and 31L are pressed against the widthwise end surfaces of the synthetic resin plate 2 so that both ends of the synthetic resin plate 2 approach each other. Move. At about the same time, the other support portions are gradually moved toward the support portions 34C and 39C around the support portions 34C and 39C, and the rail portions 41 and 44 are gradually lifted upward. Pressing rollers 32B and 32
D and the second holding rollers 33B and 33D are raised to a position higher than the other holding rollers. The movement of the other support portion is arbitrarily set according to the distance between the convex portion 5 of the synthetic resin plate 2 and the convex portion 5 adjacent thereto. Further, the lifting height of the roller is the height H of the synthetic resin plate 2 shown in FIG.
Is set arbitrarily. By this operation, the synthetic resin plate 2 is elastically deformed into a waveform as shown in FIG.

Next, the synthetic resin plate 2 elastically deformed into the waveform is pushed into the molding device 6 using an air cylinder (not shown). At this time, the first molding rollers 61A to 61C of the molding device 6 and the second molding rollers 62C to 62C are formed.
62E and between the second molding rollers 62A and 62E.
The distance between B and the first molding rollers 61D and 61E is set to a value that can be moved in the traveling direction by rotating the synthetic resin plate 2 while sandwiching the two.
The rotating shafts 71 and 72 previously rotate the first molding rollers 61A to 61E at a peripheral speed of 10 m / min.

The synthetic resin plate 2 elastically deformed to this waveform
While maintaining this shape, the roller is sandwiched between each roller disposed on the rotating shaft 71 and each roller disposed on the rotating shaft 72, and emerges as the rotating shafts 71 and 72 rotate. Moved towards the side. By this operation (movement), the synthetic resin plate 2 in the corrugating device 3 is sequentially elastically deformed into a waveform and sent to the shaping device 6. At this time, since the position of the portion of the synthetic resin plate 2 located between the rollers is regulated by the position regulating rollers 81 and 82, it is possible to prevent the synthetic resin plate 2 from being excessively curved,
Higher precision bending can be performed.

[0061] The synthetic resin plate 2 is
By the pressing of the first molding rollers 61A to 61E and the second molding rollers 62A to 62E, they are bent along the shape of the edge 65, and formed into a waveform as shown in FIG. At the time of bending by the shaping device 6, the synthetic resin plate 2 is elastically deformed in advance by the corrugating device 3 into a shape close to a waveform as shown in FIG. Accordingly, the synthetic resin plate 2 is not sharply bent, and as a result, it is possible to prevent the synthetic resin plate 2 from being damaged such as a whitening phenomenon and a crack as in the related art.

Next, as a comparison, when the synthetic resin plate was bent into a corrugated shape in the same manner as described above except that the corrugating device 3 was not used, a decrease in whitening was observed at the bent corners. Also, when the synthetic resin plate was bent into a waveform in the same manner as described above, except that the peripheral speed of the molding roller of the molding device 6 was set to 30 m / min, a decrease in whitening was observed at the bent corners.

The synthetic resin plate bending apparatus 1 described in the present embodiment is an example, and the number of rollers and the like may be set arbitrarily.

In addition to the corrugated shape described in the present embodiment (see FIG. 5), the synthetic resin plate 2 controls the movement of the pressing roller and the width determining roller, sets the diameter of the molding roller, and adjusts the width of the molding roller. By changing the setting, the setting of the installation position, and the like, various irregularities such as the shape shown in FIG. 7 can be formed.

[0065]

As described above, according to the present invention, when forming a desired unevenness on the synthetic resin plate by bending the synthetic resin plate, prior to the bending step,
The synthetic resin plate can be elastically deformed in advance into a shape close to the waveform. Therefore, since the synthetic resin plate is not bent sharply, the stress applied to the synthetic resin plate can be relieved. As a result, the synthetic resin plate can be damaged without whitening or cracking without performing a heating step. Giving can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a synthetic resin plate bending apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the corrugating device shown in FIG. 1 and is a schematic diagram showing a state before corrugating a synthetic resin plate.

FIG. 3 is a front view of the corrugating device shown in FIG. 1 and is a schematic diagram showing a state when corrugating a synthetic resin plate.

FIG. 4 is a schematic front view showing a main part of the molding device shown in FIG. 1;

FIG. 5 is a perspective view of a bent synthetic resin plate.

FIG. 6 is a partially enlarged view of FIG. 4;

FIG. 7 is a front view of a folded synthetic resin plate according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 synthetic resin plate bending device 2 synthetic resin plate 3 corrugating device 4 concave portion 5 convex portion 6 molding device 30 housing 31R, 31L width determining roller 32A-32E first pressing roller 33A-33E second pressing roller 61A-61E First molding roller 62A to 62E Second molding roller 73 Driving device 81, 82 Position regulating roller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Nara 2-12-12, Kanshu-cho, Toyonaka-shi, Osaka Mitsubishi Gas Chemical Co., Ltd. Osaka factory

Claims (13)

[Claims] 1. A method for bending a synthetic resin plate to form irregularities on the synthetic resin plate by bending the synthetic resin plate, wherein the synthetic resin plate is elastically deformed, and the synthetic resin plate has corrugated irregularities. A method of bending a synthetic resin plate, comprising: a corrugating step of forming a corrugated sheet; and a shaping step of fixing a predetermined mold corresponding to the irregularities on the elastically deformed synthetic resin plate. 2. The method according to claim 1, wherein the corrugating step includes a step of clamping each of the front and back surfaces of the synthetic resin plate at predetermined intervals in a width direction of the synthetic resin plate, and one of the adjacent ones. A step of moving the held portion so that the holding position forms the center of the concave portion and the other holding position forms the center of the convex portion to elastically deform the synthetic resin plate. 2. The method of bending a synthetic resin plate according to claim 1, wherein the molding step includes a step of bending a predetermined position near the center of the concave portion and the convex portion of the synthetic resin plate along the concave and convex shape. 3. The method of bending a synthetic resin plate according to claim 2, wherein the corrugating step further includes a step of pressing / moving a width direction end of the synthetic resin plate in a direction in which the ends approach each other. 4. The sandwiching of the synthetic resin plate can be freely moved to a sandwiching position of each of the front and back surfaces of the synthetic resin plate in a width direction of the synthetic resin plate and a direction perpendicular to the front and back surfaces of the synthetic resin plate. The elastic deformation is performed by moving the pressing roller holding the synthetic resin plate toward the center in the width direction, and pressing one of the pressing rollers adjacent to each other on the synthetic resin plate. 3. The method of bending a synthetic resin plate according to claim 2, wherein the method is performed by moving the other pressing roller toward the front surface of the synthetic resin plate. 5. The synthetic resin plate according to claim 2, wherein the elastic deformation step includes a step of regulating a position of the synthetic resin plate between the adjacent holding positions. How to bend. 6. The method of bending a synthetic resin plate according to claim 1, wherein the thickness of the synthetic resin plate is 0.4 mm or more and 3.0 mm or less. 7. An apparatus for bending a synthetic resin plate by forming an unevenness on the synthetic resin plate by bending the synthetic resin plate, wherein the synthetic resin plate is formed to have predetermined unevenness. A corrugating device for elastically deforming the
A synthetic resin plate bending device, comprising: a shaping device disposed on an output side of the corrugating device and fixing a predetermined mold corresponding to the irregularities on the synthetic resin plate supplied from the corrugating device. 8. The corrugating device is disposed on both sides in the width direction of the synthetic resin plate so as to be in contact with both ends of the synthetic resin plate, and is provided in the width direction of the synthetic resin plate. A pair of movable width determining rollers, a first pressing roller disposed on a front surface side of the synthetic resin plate and arranged at a predetermined distance from each other in a width direction of the synthetic resin plate; A second pressing roller disposed on the back side of the resin plate and opposed to each of the first pressing rollers, and forming a pair with the first pressing roller;
The bending device for a synthetic resin plate according to claim 7, wherein the pressing roller and the second pressing roller are movable in a width direction of the synthetic resin plate and in a direction perpendicular to the front and back surfaces. 9. A plurality of the first pressing roller, the second pressing roller, and the width determining roller are further disposed in a traveling direction of the synthetic resin plate, and a plurality of first pressing rollers disposed in the traveling direction. 9. The apparatus for folding a synthetic resin plate according to claim 8, wherein the pressing roller, the second pressing roller, and the width determining roller perform the same movement in each of the same rows. 10. The molding device, wherein: a first molding roller provided on a front surface side of the synthetic resin plate and opposed to a concave portion of the synthetic resin plate; A second molding roller provided at a position facing the convex portion of the synthetic resin plate; and a second molding roller provided at a position on the back side of the synthetic resin plate facing the first molding roller provided on the front surface side. A second molding roller paired with the first molding roller; and a second molding roller provided at a position on the back surface opposite to the second molding roller provided on the front surface. And a first molding roller paired with the second molding roller, wherein the second molding roller has a convex edge having an inclined surface gradually expanding toward the end at both ends of the outer peripheral surface. Wherein the first molding roller is a second molding roller. 8. The apparatus for bending a synthetic resin plate according to claim 7, wherein the apparatus is fitted between both edges. 11. The apparatus for bending a synthetic resin plate according to claim 10, wherein a driving device for rotating the first molding rollers is connected to the first molding rollers. 12. The peripheral speed of rotation of the first molding roller is not less than 5 m / min and not more than 20 m / min.
An apparatus for folding a synthetic resin plate as described in the above. 13. The position of the synthetic resin plate between the first molding roller and the second molding roller adjacent to the first molding roller on both the front and back sides of the synthetic resin plate. The apparatus for bending a synthetic resin plate according to claim 10, further comprising a regulating roller for regulating.