JP3904038B2 - Method and apparatus for folding synthetic resin plate - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method and apparatus for bending a synthetic resin plate, and more particularly to a bending method and apparatus for forming irregularities on a synthetic resin flat plate.
[0002]
[Prior art]
As a conventional method of bending a synthetic resin plate, for example, there is a cold bending method of processing a synthetic resin plate without heating. This cold bending method includes a method using a press and a method using a roller.
[0003]
The method of bending the synthetic resin plate by pressing includes a first press tool having a recess and a convex part that is complementary to the recess of the first press tool and is paired with the first press tool. A synthetic resin plate is sandwiched between two pressing tools and pressed down to bend into the concavo-convex shape.
[0004]
On the other hand, the method of bending a synthetic resin plate using a roller is such that a first roller having a concave portion and a convex portion complementary to the concave portion of the first roller are formed and paired with the first roller. A synthetic resin plate is sandwiched between the second roller and this is bent into the concavo-convex shape.
[0005]
The cold folding method using this roller can bend the synthetic resin plate continuously and is an efficient method, but on the other hand, the stress applied to the synthetic resin plate is large and the bent portion becomes white or cracks occur. There are problems such as becoming brittle.
[0006]
Furthermore, as a cold bending method using a roller, a method of bending in order from the center of the synthetic resin plate toward both ends, and all portions of the synthetic resin plate are bent at the same time, and the product width is gradually divided into a plurality of stages. A method is used in which the molding depth is increased while being narrowed toward the central portion, and then bent into a desired shape. Also in this case, since the synthetic resin plate is bent sharply, a large stress is applied when the roller is engaged with the roller, and a force for stretching the synthetic resin plate is applied in addition to the bending force.
[0007]
On the other hand, the cold folding method using a press also has the same problem. In this press method, the synthetic resin plate is bent by heating, but it cannot be automated and has a problem of low productivity.
[0008]
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]
[Problems to be solved by the invention]
However, the conventional example disclosed in Japanese Patent Publication No. 7-84030 is a method of heating and bending a synthetic resin plate, and solves the above problem in a cold bending method without heating the synthetic resin plate. I couldn't.
[0010]
Therefore, the present invention can relieve the stress applied to the synthetic resin plate without heating when the synthetic resin plate is bent, and can prevent the synthetic resin plate from being damaged such as a whitening phenomenon or a crack. An object of the present invention is to provide a method and apparatus for bending a synthetic resin plate.
[0011]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a method of 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 elastically deformed and the synthetic resin plate is bent. Provided is a method of bending a synthetic resin plate, comprising: a corrugating process for forming corrugated irregularities on a resin plate; and a molding process for fixing a predetermined mold corresponding to the irregularities on the elastically deformed synthetic resin plate. To do.
[0012]
According to this method, when the synthetic resin plate is bent by the shaping device, the synthetic resin plate is elastically deformed into a shape close to a waveform to be obtained later by the corrugating device in advance. 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.
[0013]
The corrugation step includes a step of sandwiching the positions of the front and back surfaces of the synthetic resin plate at predetermined intervals in the width direction of the synthetic resin plate, and one sandwiching position adjacent to each other is the concave portion And forming the center portion of the first protrusion, and elastically deforming the synthetic resin plate by moving the sandwiched portion so that the other sandwiching position forms the center portion of the convex portion. A step of bending a predetermined position in the vicinity of the central portion of the concave portion and the convex portion of the synthetic resin plate along the concave-convex shape can be provided.
[0014]
Moreover, the said corrugation process can further comprise the process of pressing and moving the width direction edge part of the said synthetic resin board in the direction in which the said edge part mutually approaches.
[0015]
The synthetic resin plate is sandwiched between a pair of front and back surfaces of the synthetic resin plate that are 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 with the synthetic resin plate sandwiched therebetween toward the center in the width direction, and moving one of the pressing rollers adjacent to each other to the back side of the synthetic resin plate. The other pressing roller can be moved to the surface side of the synthetic resin plate.
[0016]
The elastic deformation step may include a step of regulating the position of the synthetic resin plate between the adjacent clamping positions. As a result, it is possible to prevent the synthetic resin plate from being excessively bent and to perform bending with higher accuracy.
[0017]
The present invention is also a synthetic resin plate bending apparatus for forming irregularities on a synthetic resin plate by bending the synthetic resin plate, wherein the synthetic resin is formed so that predetermined irregularities are formed on the synthetic resin plate. A corrugating device for elastically deforming the plate, and a embossing device disposed on the exit side of the corrugating device and fixing a predetermined mold corresponding to the irregularities on the synthetic resin plate supplied from the corrugating device; The synthetic resin board bending apparatus provided with this is provided.
[0018]
The corrugating device is disposed on both sides in the width direction of the synthetic resin plate, at positions that can contact both end portions of the synthetic resin plate, and is movable in the width direction of the synthetic resin plate. A width determining roller, a first pressing roller disposed on the surface side of the synthetic resin plate at predetermined intervals in the width direction of the synthetic resin plate, and a back surface side of the synthetic resin plate And a second pressing roller disposed at a position facing each of the first pressing rollers and paired with the first pressing roller, the first pressing roller and the second pressing roller The two pressing rollers 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.
[0019]
The first pressing roller, the second pressing roller, and the width determining roller are further disposed in the traveling direction of the synthetic resin plate, and a plurality of first pressing rollers disposed in the traveling direction, The second pressing roller and the width determining roller can perform the same movement for each row.
[0020]
The molding apparatus includes a first molding roller provided on a surface side of the synthetic resin plate and facing a concave portion of the synthetic resin plate, and a convex surface of the synthetic resin plate on the surface side. A second molding roller provided at a position facing the portion, and a back surface side of the synthetic resin plate, provided at a position facing the first molding roller provided on the front surface side. A second molding roller that forms a pair with the molding roller, and a second molding roller that is provided at a position opposite to the second molding roller provided on the rear surface side and on the front surface side. The first mold roller, and the second mold roller is formed with convex edges having inclined surfaces that gradually spread toward both ends of the outer peripheral surface. The mold roller is suitable between the edges of the second mold roller. It can be configured to.
[0021]
Moreover, you may connect the drive device which rotates these to the said 1st shaping | molding roller.
[0022]
The peripheral speed of rotation of the first mold roller is preferably 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.
[0023]
A regulating roller that regulates the position of the synthetic resin plate on both the front and back sides of the synthetic resin plate and between the first molding roller and a second molding roller adjacent to the first molding roller. Can be provided.
[0024]
In addition, as a synthetic resin board used for this invention, a polycarbonate, polyvinyl chloride, an acrylic resin, FRP, etc. are used. In particular, a polycarbonate resin having excellent impact resistance at low temperatures is preferably used. Specifically, this resin has the property that whitening and cracking are less likely to occur during processing such as bending at a temperature of about 0 to 35 ° C. Moreover, 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 layer having a thickness of 20 to 100 μm and an acrylic resin added with an ultraviolet absorber or a polycarbonate resin added with an ultraviolet absorber is preferable, and the latter is particularly preferable. For the purpose of preventing the front and back surfaces from being damaged, a film having an appropriate thickness may be attached to the synthetic resin plate.
[0025]
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.
[0026]
Moreover, although the length of a synthetic resin board is about 1-15 m normally. It may be more or less than this. The wave forming process and the mold forming process described above can be automated by adopting appropriate sequence control and numerical control.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0028]
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), 2 is a front view of the corrugating apparatus shown in FIG. 1, and is a schematic diagram showing a state before corrugating the synthetic resin plate, and FIG. 3 is a front view of the corrugating apparatus shown in FIG. FIG. 4 is a schematic front view showing the main part of the molding apparatus shown in FIG. 1, and FIG. 5 is a perspective view of the folded synthetic resin plate. 6 is a partially enlarged view of FIG.
[0029]
In the present embodiment, the width direction of the synthetic resin plate inserted into the synthetic resin plate bending apparatus may be described as “left and right”, the front side as “up”, and the back side as “down”.
[0030]
Further, in this embodiment, five pairs (five sets) of rollers are shown, but in practice, a large number of roller sets may be used, and a set of rollers is used as many as the number of folds.
[0031]
As shown in FIGS. 1 to 4, a synthetic resin plate bending apparatus 1 according to the present embodiment includes a corrugating apparatus 3 that elastically deforms a synthetic resin board 2 inserted substantially horizontally into a wave shape, and a corrugating apparatus 3. And a molding apparatus 6 for fixing a predetermined mold to the elastically deformed synthetic resin plate 2 carried out from the corrugating apparatus 3.
[0032]
As shown in FIGS. 1 to 3, the corrugating device 3 includes width determining rollers 31 </ b> R and 31 </ b> L disposed at positions that can contact both end portions of the synthetic resin plate 2 inserted substantially horizontally, and synthetic resin. A plurality of first pressing rollers 32 </ b> A to 32 </ b> E disposed at a predetermined interval in the width direction of the synthetic resin plate 2, and the rear surface side of the synthetic resin plate 2. The second pressing rollers 33A to 33E are arranged at positions facing the first pressing rollers 32A to 32E and are paired with the first pressing rollers 32A to 32E.
[0033]
The width-determining rollers 31R and 31L are supported so as to be movable left and right by slide portions 36R and 36L which are arranged on the outside of the housing 30 so as to be movable left and right on the lower frame 40D and the upper frame 40U. Yes. The slide portions 36R and 36L are moved and stopped by a driving device (not shown).
[0034]
The width determining rollers 31R and 31L are provided so as to be rotatable in the advancing direction of the synthetic resin plate 2 and movable in the left-right direction by the rotation of the rotation shafts 35R and 35L. That is, the width determining rollers 31R and 31L move both ends of the synthetic resin plate 2 toward each other, thereby pressing and moving the both ends of the synthetic resin plate 2 in that direction, thereby adjusting the width of the synthetic resin plate 2. Can do. Further, the width determining rollers 31R and 31L can also move in a direction in which they are moved away from each other. The outer peripheral surfaces of the width determining rollers 31R and 31L have a uniform curved surface shape like a normal roller.
[0035]
In the present embodiment, eight width determining rollers 31R and 31L are arranged at predetermined intervals (200 mm in the present embodiment) in the traveling direction (length direction) of the synthetic resin plate 2. .
[0036]
The first pressing rollers 32A to 32E are each provided by eight supporting portions 34A to 34E arranged above them at predetermined intervals in the traveling direction of the synthetic resin plate 2, and The synthetic resin plate 2 is supported so as to be rotatable in the traveling direction. The arrangement 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. Further, the outer peripheral surfaces of the first pressing rollers 32A to 32E have a uniform curved surface shape like ordinary rollers.
[0037]
The support portion 34C is fixed to a rail portion 37 provided horizontally at a position above the support portion 34C of the right frame 40R and the left frame 40L of the housing 30. 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) and can be designed to move left and right by rotating on the rail portion 37. .
[0038]
The rail portion 37 is installed on the right frame 40R and the left frame 40L so that it can move to some extent in the vertical direction. Thereby, for example, when the synthetic resin plate 2 is inserted and installed, the distance between the first pressing rollers 32A, 32C and 32E and the second pressing rollers 33A, 33C and 33E can be adjusted.
[0039]
On the other hand, the support portions 34B and 34D are not shown on the rail portion 41 that is 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 is movable in the vertical direction. It is movably provided to the left and right by a driving device (same configuration as the support portions 34A and 34E). The rail portion 41 is moved and stopped by a driving device (not shown).
[0040]
With this structure, the first pressing rollers 32B and 32D supported by the support portions 34B and 34D can move upward from the first pressing rollers 32A, 32C, and 32E, as shown particularly in FIG. Become.
[0041]
The first pressing rollers 32 </ b> A to 32 </ b> E are moved in the same direction in the same direction of travel of the synthetic resin plate 2.
[0042]
The second pressing rollers 33A to 33E have the same configuration as the first pressing rollers 32A to 32E, and are supported by the first pressing rollers 32A to 32E by the support portions 39A to 39E disposed below them. It is arranged at the opposed position.
[0043]
The support part 39C is fixed to a rail part 43 that is horizontally provided at a position below the support part 39C of the right frame 40R and the left frame 40L and that can move to some extent. Further, the support portions 39A and 39E are provided to be movable to the left and right on the rail portion 43 that can move to some extent by the same method as the support portions 34A and 34E.
[0044]
On the other hand, the support portions 39B and 39D are arranged below the rail portion 43, and are movable to the left and right by a rail portion 44 that is movable in the vertical direction by a driving device (not shown) (same configuration as the support portions 34A and 34E). Is provided. The rail portion 44 is moved and stopped by a driving device (not shown).
[0045]
With this structure, the second pressing rollers 33B and 33D supported by the support portions 39B and 39D can move above the second pressing rollers 33A, 33C and 33E, as shown in FIG. Become.
[0046]
As shown in FIGS. 1, 4, and 6, the molding apparatus 6 includes a first molding roller 61 </ b> A provided on the surface side of the synthetic resin plate 2 and at a position facing the concave portion 4 of the synthetic resin plate 2. 61C, the second mold roller 62A and 62B provided on the front surface side and facing the convex portion 5 of the synthetic resin plate 2, and the back surface side of the synthetic resin plate 2, Second molding rollers 62C to 62E provided at positions facing the first molding rollers 61A to 61C and paired with the first molding rollers 61A to 61C, and the second molding roller 62A on the back surface side. The first molding rollers 61D and 61E, which are provided at positions opposed to the second molding rollers 62A and 62B and are paired with the second molding rollers 62A and 62B, are provided. However, the second rollers 62A and 62B are rotatable with respect to the rotating shaft 71, and the second rollers 62C to 62E are rotatable with respect to the rotating shaft 72, respectively.
[0047]
As shown in FIG. 5, the concave portion 4 and the convex portion 5 of the synthetic resin plate 2 are the concave portion 4 on the back side of the convex portion 5 when viewed from the front surface side (upper surface side) of the synthetic resin plate 2. The back side has a relationship to be the convex portion 5.
[0048]
The first molding rollers 61A to 61C and the second rollers 62A and 62B are alternately disposed on the rotating shaft 71 every other one. Further, the first molding rollers 61D and 61E and the second rollers 62C to 62E are alternately arranged on the rotation shaft 72 every other one. The rotating shafts 71 and 72 are connected to a driving device 73 that rotates and stops them.
[0049]
Note that the roller disposed on the rotation shaft 71 and the roller disposed on the rotation shaft 72 have the same configuration except that the arrangement order is reversed. The roller disposed in will be described in detail.
[0050]
The first mold rollers 61A to 61C are designed to have a larger diameter than the second mold 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).
[0051]
As shown in FIG. 6, the second shaping rollers 62 </ b> A and 62 </ b> B are particularly formed with convex edge portions 65 having inclined surfaces 64 that gradually widen toward both ends of the outer peripheral surface 63. Has been. The inclination angle of the inclined surface 64 is set to correspond to the bending angle α (see FIG. 5) of the synthetic resin plate 2. This angle α is normally set to an acute angle (90 degrees or less) so that the synthetic resin plate has a sharp inclination angle. The second molding rollers 62 </ b> A and 62 </ b> B rotate in contact with a portion forming the vertex of the convex portion 5 of the synthetic resin plate 2.
[0052]
The first molding rollers 61A to 61C have a length substantially equal to the width (distance between both edge portions 64) of the outer peripheral surface 63 of the second molding rollers 62A and 62B. The first molding rollers 61 </ b> A to 61 </ b> C rotate with the synthetic resin plate 2 sandwiched between the outer peripheral surface 63. In other words, the synthetic resin plate 2 rotates in contact with the apex of the concave portion 4.
[0053]
A regulating roller 81 that rotates in contact with the surface of the synthetic resin plate 2 passing therethrough and regulates the position of the synthetic resin plate 2 between the first molding roller 61A and the second molding roller 62A. A similar regulating roller 82 that rotates in contact with the back side is disposed.
[0054]
As shown in FIG. 4, the regulating rollers 81 and 82 are similarly disposed between the other rollers.
[0055]
Next, a specific operation of the synthetic resin plate bending apparatus 1 having this configuration will be described. In this embodiment, a polycarbonate flat plate having a thickness of 2.0 mm, a width of 930 mm, and a length of 2500 mm obtained by laminating an acrylic resin film having a thickness of 50 μm added with an ultraviolet absorber on one side is used as the synthetic resin plate 2. The case where it is used will be described.
[0056]
First, the synthetic resin plate 2 is inserted from the entrance side of the corrugating device 3, and the front end of the synthetic resin plate 2 is ejected through the space between the first pressing rollers 32A to 32E and the second pressing rollers 33A to 33E. Take out from the side. At this time, the first pressing rollers 32A to 32E and the second pressing rollers 33A to 33E are held at the same horizontal position. Further, the width determining rollers 31 </ b> R and 31 </ b> L are positioned outside the width of the synthetic resin plate 2.
[0057]
Next, the rail portion 37 is lowered and the first pressing rollers 32A to 32E and the second pressing rollers 33A to 33E sandwich the predetermined position of the synthetic resin plate 2.
[0058]
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 end surface in the width direction of the synthetic resin plate 2 to move both end portions of the synthetic resin plate 2 in a direction approaching each other. At substantially 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, so that the first The pressing rollers 32B and 32D and the second pressing rollers 33B and 33D are pulled up to higher positions than the other pressing rollers. The movement of this other support part is arbitrarily set by the distance between the convex part 5 of the synthetic resin plate 2 and the convex part 5 adjacent thereto. Further, the height of lifting of the roller is arbitrarily set by the height H of the synthetic resin plate 2 shown in FIG. By this operation, the synthetic resin plate 2 is elastically deformed into a waveform as shown in FIG.
[0059]
Next, the synthetic resin plate 2 elastically deformed into this waveform is pushed forward to the molding apparatus 6 using an air cylinder (not shown). At this time, between the first mold rollers 61A to 61C and the second mold rollers 62C to 62E of the mold apparatus 6, the second mold rollers 62A and 62B, and the first mold rollers 61D and 61E. The distance between them is set to a value that can be moved in the traveling direction by rotating the synthetic resin plate 2 between the two. In addition, the rotation shafts 71 and 72 rotate the first shaping rollers 61A to 61E in advance at a peripheral speed of 10 m / min.
[0060]
The synthetic resin plate 2 elastically deformed in this waveform is sandwiched between each roller disposed on the rotating shaft 71 and each roller disposed on the rotating shaft 72 while maintaining this shape, As the rotary shafts 71 and 72 rotate, they are moved toward the exit side. By this operation (movement), the synthetic resin plate 2 in the corrugating apparatus 3 is sequentially elastically deformed into a waveform and sent into the mold forming apparatus 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, Bending with higher accuracy can be performed.
[0061]
The synthetic resin plate 2 is bent along the shape of the edge portion 65 by the pressing of the first molding rollers 61A to 61E and the second molding rollers 62A to 62E by the molding device 6, as shown in FIG. It is formed in a simple waveform. At the time of bending by the molding apparatus 6, the synthetic resin plate 2 is elastically deformed in advance by a corrugating apparatus 3 into a shape close to a waveform as shown in FIG. 5. Therefore, as a result of the synthetic resin plate 2 not being bent rapidly, it was possible to prevent the synthetic resin plate from being damaged such as whitening and cracking as in the conventional case.
[0062]
Next, as a comparison, when the synthetic resin plate was bent into a corrugated shape by the same method as described above except that the corrugating apparatus 3 was not used, a decrease in whitening was observed at the bent corner portion. Further, when the synthetic resin plate was bent into a waveform by the same method as described above except that the peripheral speed of the molding roller of the molding apparatus 6 was set to 30 m / min, a decrease in whitening was observed at the folded corner.
[0063]
In addition, the synthetic resin plate bending apparatus 1 demonstrated in this Embodiment is an example, and you may set the number of installation of each roller, etc. arbitrarily.
[0064]
The synthetic resin plate 2 controls the movement of the pressing roller and the width determining roller in addition to the corrugated shape described in the present embodiment (see FIG. 5), and sets the diameter of the shaping roller, sets the width, and sets the width. By changing the position setting or the like, for example, various irregularities such as the shape shown in FIG. 7 can be formed.
[0065]
【The invention's effect】
As described above, according to the present invention, when a desired unevenness is formed on the synthetic resin plate by bending the synthetic resin plate, the synthetic resin plate is formed in a shape close to the waveform in advance before the bending step. It can be elastically deformed. Therefore, since this synthetic resin plate is not bent sharply, the stress applied thereto can be relieved. As a result, the synthetic resin plate can be damaged such as whitening and 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 apparatus shown in FIG. 1, and is a schematic diagram showing a state before corrugating a synthetic resin plate.
3 is a front view of the corrugating apparatus 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 the main part of the molding apparatus shown in FIG. 1. FIG.
FIG. 5 is a perspective view of a bent synthetic resin plate.
6 is a partially enlarged view of FIG. 4;
FIG. 7 is a front view of a bent synthetic resin plate according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Synthetic resin board bending apparatus 2 Synthetic resin board 3 Corrugation apparatus 4 Concave part 5 Convex part 6 Molding apparatus 30 Housing 31R, 31L Width-determining rollers 32A-32E 1st press roller 33A-33E 2nd press roller 61A-61E 1st 1 type roller 62A-62E 2nd type roller 73 drive device 81, 82 position control roller

Claims (6)

A method of bending a synthetic resin plate by forming irregularities on the synthetic resin plate by bending the synthetic resin plate,
Sandwiching the respective positions of the front and back surfaces of the synthetic resin plate at predetermined intervals in the width direction of the synthetic resin plate;
The synthetic resin plate is elastically deformed by moving the sandwiched portion so that one of the sandwiching positions adjacent to each other forms the central portion of the concave portion and the other sandwiching position forms the central portion of the convex portion. , A corrugation process for forming corrugated irregularities on the synthetic resin plate,
A molding step of bending a predetermined position near the center of the concave and convex portions of the elastically deformed synthetic resin plate along the concave and convex shapes;
A method for bending a synthetic resin plate comprising:   The method of bending a synthetic resin plate according to claim 1, wherein the corrugating step further includes a step of pressing and moving the widthwise end portions of the synthetic resin plate in a direction in which the end portions approach each other.   The synthetic resin plate is sandwiched between a pair of front and rear surfaces of the synthetic resin plate that are movable in the width direction of the synthetic resin plate and in a direction perpendicular to the front and rear surfaces of the synthetic resin plate. The elastic deformation is performed by the pressing roller, and the pressing roller in a state of sandwiching the synthetic resin plate is moved toward the center in the width direction, and one pressing roller adjacent to each other is moved to the back side of the synthetic resin plate. The method of bending a synthetic resin plate according to claim 1, wherein the other pressing roller is moved to the surface side of the synthetic resin plate. The method for bending a synthetic resin plate according to any one of claims 1 to 3, wherein the elastic deformation is performed including a step of regulating a position of the synthetic resin plate between the adjacent clamping positions. A bending device for a synthetic resin plate that forms an irregularity on the synthetic resin plate by bending the synthetic resin plate,
The synthetic resin plate is arranged 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 so that predetermined unevenness is formed, and the synthetic resin plate A pair of width determining rollers movable in the width direction; and first pressing rollers disposed on the surface side of the synthetic resin plate at predetermined intervals in the width direction of the synthetic resin plate; A second pressing roller disposed on the back side of the synthetic resin plate and facing each of the first pressing rollers, and paired with the first pressing roller. The corrugating device for elastically deforming the synthetic resin plate, wherein the first pressure roller and the second pressure roller are movable in a width direction of the synthetic resin plate and a direction perpendicular to the front and back surfaces;
A molding apparatus disposed on the exit side of the corrugating apparatus and fixing a predetermined mold corresponding to the irregularities on the synthetic resin plate supplied from the corrugating apparatus;
Synthetic resin plate bending apparatus.   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 the plurality of first pressing rollers, second disposed in the traveling direction. 6. The synthetic resin plate bending apparatus according to claim 5, wherein the pressing roller and the width determining roller perform the same movement for each row.

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