Patent Publication Number: US-2021187864-A1

Title: Production method and production device for three-dimensional decorative piece made of thermoplastic synthetic resin

Description:
TECHNICAL FIELD 
     The present invention relates to a method and a device for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin, such as an emblem to be attached to a car, a motorbike, a boat, a household electrical appliance, a game console, clothes, a bag, a cap, or the like, and more specifically relates to a method and a device with which a bulky three-dimensional decorative piece made of a thermoplastic synthetic resin can be produced. 
     BACKGROUND ART 
     Three-dimensional decorative pieces made of a thermoplastic synthetic resin (hereinafter referred to simply as “decorative pieces”, if appropriate), such as emblems, appliques, and stickers, produced through high-frequency dielectric heating have been proposed (see Patent Document 1, for example). 
     A decorative piece is produced from a decorative piece material that includes a thermoplastic resin sheet, a vapor-deposited metal layer, a foamed resin sheet, and the like. For example, according to Patent Document 1, while a decorative piece material is sandwiched between an engraved die and a flat-plate die, high-frequency dielectric heating is performed, thereby shaping the decorative piece material while heating and welding the material. The engraved die is provided with fusion-cutting blades along outlines of a design of a decorative piece to be produced, so that fusion-cutting can be performed simultaneously with shaping. 
     CITATION LIST 
     Patent Document 
     [Patent Document 1] Japanese Patent No. 3235943 
     SUMMARY OF INVENTION 
     Technical Problem 
     In order to produce a decorative piece, it is necessary to soften, shape, and weld a decorative piece material by heating the decorative piece material through high-frequency dielectric heating. However, high-frequency dielectric heating has the property of radio waves being focused on a cutting edge, or a corner portion of a design. Accordingly, if the thickness of a decorative piece material is increased, it is no longer possible for the entire decorative piece material to be heated, and shaping and welding cannot be satisfactorily performed. For this reason, the thickness of decorative pieces that can be produced has been limited to up to about 2 mm. 
     On the other hand, there is demand for bulky decorative pieces that have an enhanced three-dimensional appearance and an enhanced sense of luxuriousness. 
     An object of the present invention is to provide a method and a device with which a bulky decorative piece made of a thermoplastic synthetic resin can be produced. 
     Solution to Problem 
     A method for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin according to the present invention includes: 
     a step of preparing a decorative piece material including an upper layer that has a thermoplastic synthetic resin film and a lower layer that has a thermoplastic synthetic resin sheet;
         a step of disposing the decorative piece material on a flat-plate die serving as an electrode; and a softening step of softening and welding the decorative piece material by bringing a flat-plate die serving as another electrode closer to the flat-plate die serving as the electrode, and performing high-frequency dielectric heating while pressing the decorative piece material.       

     The method can include: 
     after the softening step, 
     a step of disposing the decorative piece material on a flat-plate die serving as an electrode such that the lower layer side of the decorative piece material abuts against the flat-plate die; 
     a shaping step of shaping the decorative piece material by bringing an engraved die, the engraved die serving as an electrode and having a recess of a design to be formed in the decorative piece material, closer to the flat-plate die on which the decorative piece material is disposed, and performing high-frequency dielectric heating while pressing the decorative piece material; 
     a step of disposing a piece of release paper on the lower layer of the decorative piece material via a piece of double-sided tape or a thermal bonding film and disposing the decorative piece material on a flat-plate die serving as an electrode such that the release paper abuts against the flat-plate die; and 
     a fusion-cutting step of bringing a fusion-cutting blade die closer to the flat-plate die, the fusion-cutting blade die serving as an electrode and having a recess of the design to be formed in the decorative piece material and a fusion-cutting blade provided along an outline of the design, and performing high-frequency dielectric heating while pressing the decorative piece material, to thereby fusion-cut the decorative piece material using the fusion-cutting blade. 
     The method can include: 
     after the softening step, 
     a step of disposing a piece of release paper on the lower layer of the decorative piece material via a piece of double-sided tape or a thermal bonding film and disposing the decorative piece material on a flat-plate die serving as an electrode such that the release paper abuts against the flat-plate die; and 
     a shaping and fusion-cutting step of bringing an engraved die with a fusion-cutting blade closer to the flat-plate die, the engraved die serving as an electrode and having a recess of a design to be formed in the decorative piece material and a fusion-cutting blade provided along an outline of the design, and performing high-frequency dielectric heating while pressing the decorative piece material, to thereby shape the decorative piece material and fusion-cut the decorative piece material using the fusion-cutting blade. 
     The method can include: 
     after the softening step, 
     a step of disposing the decorative piece material on a flat-plate die serving as an electrode such that the lower layer of the decorative piece material abuts against the flat-plate die; 
     a shaping step of shaping the decorative piece material by bringing an engraved die with a fusion-cutting blade, the engraved die serving as an electrode and having a recess of a design to be formed in the decorative piece material and a fusion bonding blade provided along an outline of the design, closer to the flat-plate die, and performing high-frequency dielectric heating while pressing the decorative piece material to such an extent that the decorative piece material is not fusion-cut; and 
     a fusion-cutting step of, in a state in which the decorative piece material is held on the engraved die with the fusion-cutting blade, disposing a piece of release paper on the lower layer of the decorative piece material via a piece of double-sided tape or a thermal bonding film, bringing the engraved die with the fusion-cutting blade closer to a flat-plate die with a cushioning material, the flat-plate die serving as an electrode and having a recess formed at a position corresponding to the design and a cushioning material arranged in the recess, closere to the engraved die with the fusion-cutting blade, and performing high-frequency dielectric heating while pressing the decorative piece material, to thereby attach the decorative piece to the double-sided tape or weld the decorative piece material to the thermal bonding film and fusion-cut the decorative piece material using the fusion-cutting blade. 
     The method can include: 
     after the fusion-cutting step or the shaping and fusion-cutting step, 
     a step of removing the decorative piece material, eliminating an unnecessary portion, and then attaching an application film for holding the separated design in position to the upper layer side of the decorative piece material. 
     Moreover, a device for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin according to the present invention is a device for producing a decorative piece made of a thermoplastic synthetic resin by shaping a decorative piece material including an upper layer that has a thermoplastic synthetic resin film and a lower layer that has a thermoplastic synthetic resin sheet through high-frequency dielectric heating and fusion-cutting the decorative piece material using a fusion-cutting blade, the device including: 
     a first jig having a first frame that includes a pair of parallel first guide members, a first slide plate that is slidably disposed on the first guide members, and a first high-frequency dielectric heating device that is disposed on a transfer path of the first slide plate and applies high-frequency dielectric heating to the first slide plate; and 
     a second jig having a second frame that includes a pair of parallel second guide members, a second slide plate that is slidably disposed on the second guide members, and a second high-frequency dielectric heating device that is disposed on a transfer path of the second slide plate and applies high-frequency dielectric heating to the second slide plate, 
     wherein, in the first jig and the second jig, the first slide plate and the second slide plate are slidable in the same direction, 
     the first high-frequency dielectric heating device and the second high-frequency dielectric heating device are arranged so as to oppose each other with the first slide plate and the second slide plate located therebetween, 
     a first flat-plate die that is flat and a first engraved die with a fusion-cutting blade, the first engraved die having a recess of a design to be formed in the decorative piece material and a fusion-cutting blade along an outline of the design, are fastened to a surface of the first slide plate that opposes the second slide plate such that the first flat-plate die and the first engraved die are arranged side-by-side in a slide direction, and 
     a second flat-plate die that is flat and a second engraved die, the second engraved die having a recess of the design to be formed in the decorative piece material, are fastened to a surface of the second slide plate that opposes the first slide plate such that the second flat-plate die and the second engraved die are arranged side-by-side in the slide direction. 
     Moreover, a device for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin according to the present invention is a device for producing a decorative piece made of a thermoplastic synthetic resin by shaping a decorative piece material including an upper layer that has a thermoplastic synthetic resin film and a lower layer that has a thermoplastic synthetic resin sheet through high-frequency dielectric heating and fusion-cutting the decorative piece material using a fusion-cutting blade, the device including:
         a first jig having a first frame, a first flat-plate die mounted on the first frame, and a first high-frequency dielectric heating device that applies high-frequency dielectric heating to the first flat-plate die; and       

     a second jig having a second frame that includes a pair of parallel second guide members, a second slide plate that is slidably disposed on the second guide members, and a second high-frequency dielectric heating device that is disposed on a transfer path of the second slide plate and applies high-frequency dielectric heating to the second slide plate, 
     wherein the first high-frequency dielectric heating device and the second high-frequency dielectric heating device are arranged so as to oppose each other with the first flat-plate die and the second slide plate located therebetween, and 
     a second flat-plate die that is flat and a second engraved die with a fusion-cutting blade, the second engraved die having a recess of a design to be formed in the decorative piece material and a fusion-cutting blade along an outline of the design, are fastened to a surface of the second slide plate that opposes the first flat-plate die such that the second flat-plate die and the second engraved die are arranged side-by-side in the slide direction. 
     Moreover, a device for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin according to the present invention is a device for producing a decorative piece made of a thermoplastic synthetic resin by shaping a decorative piece material including an upper layer that has a thermoplastic synthetic resin film and a lower layer that has a thermoplastic synthetic resin sheet through high-frequency dielectric heating and fusion-cutting the decorative piece material using a fusion-cutting blade, the device including: 
     a first jig having a first frame that includes a pair of parallel first guide members, a first slide plate that is slidably disposed on the first guide members, and a first high-frequency dielectric heating device that is disposed on a transfer path of the first slide plate and applies high-frequency dielectric heating to the first slide plate; and 
     a second jig having a second frame that includes a pair of parallel second guide members, a second slide plate that is slidably disposed on the second guide members, and a second high-frequency dielectric heating device that is disposed on a transfer path of the second slide plate and applies high-frequency dielectric heating to the second slide plate, 
     wherein, in the first jig and the second jig, the first slide plate and the second slide plate are slidable in the same direction, 
     the first high-frequency dielectric heating device and the second high-frequency dielectric heating device are arranged so as to oppose each other with the first slide plate and the second slide plate located therebetween, 
     a first flat-plate die that is flat and a recessed die with a cushioning material, the recessed die having a recess at a position corresponding to a design to be formed in the decorative piece material and a cushioning material fitted in the recess, are fastened to a surface of the first slide plate that opposes the second slide plate such that the first flat-plate die and the recessed die are arranged side-by-side in a slide direction, and 
     a second flat-plate die that is flat and a second engraved die with a fusion-cutting blade, the second engraved die having a recess of the design to be formed in the decorative piece material and a fusion-cutting blade formed along an outline of the design, are fastened to a surface of the second slide plate that opposes the first slide plate such that the second flat-plate die and the second engraved die are arranged side-by-side in the slide direction. 
     Effects of the Invention 
     With the method for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin according to the present invention, the entire decorative piece material can be heated and softened by performing high-frequency dielectric heating on the decorative piece material using the flat-plate dies. Since the entire decorative piece material is heated and softened through high-frequency dielectric heating prior to the shaping, the decorative piece material can be shaped using the engraved die in the subsequent shaping step even when the decorative piece material is thick, and thus, a bulky three-dimensional decorative piece made of a thermoplastic synthetic resin that has a three-dimensional appearance and a sense of luxuriousness can be favorably produced. 
     Moreover, with the device for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin according to the present invention, it is possible to shape the decorative piece material using the engraved die and/or the engraved die with the fusion-cutting blade immediately after softening the decorative piece material using the flat-plate die, by sliding the dies after the softening. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a cross-sectional view of a decorative piece material according to an embodiment of the present invention. 
         FIG. 2  is an explanatory diagram illustrating a softening step of the present invention. 
         FIG. 3  is an explanatory diagram illustrating a shaping step and a fusion-cutting step according to a first embodiment of the present invention. 
         FIG. 4  shows (a) a plan view, (b) a vertical cross-sectional view, and (c) a horizontal cross-sectional view of a first jig that is used in the first embodiment of the present invention. 
         FIG. 5  shows (a) a bottom view, (b) a vertical cross-sectional view, (c) a horizontal cross-sectional view, and (d) a plan view of a second jig that is used in the first embodiment of the present invention. 
         FIG. 6  shows (a) a plan view, (b) a vertical cross-sectional view, and (c) a horizontal cross-sectional view of the first jig in  FIG. 4  in a state in which dies are fastened to the first jig. 
         FIG. 7  shows plan views and cross-sectional views of (a) a flat-plate die and (b) an engraved die with fusion-cutting blades that are to be fastened to the first jig. 
         FIG. 8  shows (a) a bottom view, (b) a vertical cross-sectional view, and (c) a horizontal cross-sectional view of the second jig in  FIG. 5  in a state in which dies are fastened to the second jig. 
         FIG. 9  shows plan views and cross-sectional views of (a) a flat-plate die and (b) an engraved die that are to be fastened to the second jig. 
         FIG. 10  is an explanatory diagram of a production method that uses a production device of the first embodiment of the present invention. 
         FIG. 11  is an explanatory diagram illustrating a shaping and fusion-cutting step according to a second embodiment of the present invention. 
         FIG. 12  is an explanatory diagram of a production method that uses a production device of the second embodiment of the present invention. 
         FIG. 13  is an explanatory diagram illustrating a shaping step and a fusion-cutting step according to a third embodiment of the present invention. 
         FIG. 14  shows (a) a plan view and (b) a vertical horizontal cross-sectional view of the first jig that is used in a third production method of the present invention. 
         FIG. 15  shows a plan view and a cross-sectional view of a recessed die with cushioning materials that is to be fastened to the first jig in  FIG. 14 . 
         FIG. 16  shows (a) a bottom view and (b) a horizontal cross-sectional view of the second jig that is used in the third production method of the present invention. 
         FIG. 17  shows a plan view and a cross-sectional view of an engraved die with fusion-cutting blades that is to be fastened to the second jig in  FIG. 16 . 
         FIG. 18  is an explanatory diagram of the production method that uses a third production device of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a three-dimensional decorative piece  90  made of a thermoplastic synthetic resin of the present invention and a method for producing the three-dimensional decorative piece  90  will be described with reference to the drawings. Note that, in the drawings, the thicknesses of the decorative piece  90  and layers of a decorative piece material  91 , projections and recesses of dies, the thicknesses of the dies, and the like are shown exaggerated to facilitate the explanation. Also, the shapes, the designs, and the like of the decorative piece  90  and the decorative piece material  91  are given by way of example only, and can be changed as appropriate. 
       FIG. 1  is a cross-sectional view of the decorative piece material  91 . As shown in  FIG. 1 , the decorative piece material  91  includes an upper layer  92  and a lower layer  93 . 
     The upper layer  92  is a laminated film including a thermoplastic synthetic resin film that can be molded through high-frequency dielectric heating, a vapor-deposited metal layer, and the like. The thermoplastic synthetic resin film may be made of a soft thermoplastic synthetic resin, such as polyvinyl chloride or polyurethane, for example. The upper layer  92  can be formed by, for example, forming the vapor-deposited metal layer on the thermoplastic synthetic resin film that is located on the upper surface side through metal vapor deposition. Note that the upper layer  92  may also have a configuration in which a migration preventing film is provided on a lower surface of the vapor-deposited metal layer via an adhesive layer, if necessary, and furthermore a thermoplastic synthetic resin film may be provided thereunder via an adhesive layer. 
     An example of the migration preventing film is an ethylene-vinyl alcohol copolymer (EVOH) film. The migration preventing film prevents a dye of a garment or the like to which the decorative piece  90  is attached from migrating to a front surface side of the decorative piece material  91 . 
     A desired design can also be printed in a desired color onto an upper surface of the upper layer  92  using a transparent color ink, a matte ink, a glossy ink, or the like. Furthermore, a fine line design can also be added by screen printing an ultraviolet-curable transparent UV ink or the like onto the above-described printing, so that a sense of luxuriousness such as that of braided embroidery, an aura of substance, elaborateness, a depth of color, and a metallic appearance, and furthermore, minute projections and depressions, and the like can also be expressed. 
     A soft sheet of a thermoplastic synthetic resin or a foamed resin sheet can be used as the lower layer  93 , and the lower layer  93  may be made of a thermoplastic synthetic resin, such as soft polyvinyl chloride (PVC), for example. 
     In the present invention, a material in which a foamed resin sheet or the like is thicker than that of a conventional material can be used as the decorative piece material  91 . For example, the decorative piece material  91  may have a total thickness of greater than 2 mm, and the shaping of a decorative piece material having such a thickness has been difficult with a conventional method. The decorative piece material  91  has a thickness of preferably about 2.3 mm to 6 mm, but the present invention is also applicable to a decorative piece material having a greater thickness. 
     A feature of the present invention is that the decorative piece material  91  is softened through high-frequency dielectric heating in advance, and then high-frequency dielectric heating is performed again to thereby perform shaping and fusion-cutting. 
     Softening Step 
     As illustrated in  FIG. 2 , the step of softening the decorative piece material  91  can be performed by performing high-frequency dielectric heating while the decorative piece material  91  is sandwiched between a first flat-plate die  20  and a second flat-plate die  21 , which serve as electrodes. Specifically, the decorative piece material  91  is placed on top of the first flat-plate die  20  as illustrated in  FIG. 2( a ) , the second flat-plate die  21  is brought closer to the first flat-plate die  20  as illustrated in  FIG. 2( b ) , and high-frequency dielectric heating is performed. Thus, insulators of the upper layer  92  and the lower layer  93  of the decorative piece material  91  generate heat and fuse, allowing both layers to be softened in their entirety and welded to each other. After the high-frequency dielectric heating, the second flat-plate die  21  is separated from the decorative piece material  91  as illustrated in  FIG. 2( c ) . 
     First Embodiment 
     According to a first embodiment, after the softening step, the decorative piece material  91  is shaped as illustrated in  FIGS. 3( a ) to 3( c )  (shaping step), and subsequently the shaped decorative piece material  91  is fusion-cut as illustrated in  FIGS. 3( d ) to 3( f )  (fusion-cutting step). 
     In the shaping step, as illustrated in  FIG. 3( a ) , the first flat-plate die  20  is used, and an engraved die  22  is used in place of the second flat-plate die  21  in  FIG. 2 . As illustrated in  FIG. 3( a ) , the engraved die  22  is a die in which recesses  23  of a design to be formed in the decorative piece material  91  are formed. While the decorative piece material  91  that is in a softened state due to the softening step is still placed on top of the first flat-plate die  20 , the engraved die  22  is brought closer to the first flat-plate die  20  as illustrated in  FIG. 3( b ) , and high-frequency dielectric heating is performed. Thus, the decorative piece material  91  is shaped in conformity with the recesses  23  of the engraved die  22  as illustrated in  FIG. 3( c ) . In the shaping step, since the decorative piece material  91  that is softened in its entirety in advance is shaped, the shaping can be performed even when the decorative piece material  91  is thick. Note that, after the shaping, the decorative piece material  91  is cooled to fix its shape. 
     After the shaping step, the decorative piece material  91  is fusion-cut along the design. In the fusion-cutting step, first, as illustrated in  FIG. 3( d ) , the decorative piece material  91  with a piece of release paper  95  disposed on or attached to the lower layer  93  side thereof via a piece of double-sided tape  94  is placed on top of the first flat-plate die  20 . The double-sided tape  94  is used to attach the produced decorative piece  90  to various products and the like. 
     In the fusion-cutting step, as also illustrated in  FIG. 3( d ) , an engraved die  24  with fusion-cuttings blade is used in place of the engraved die  22 . The engraved die  24  with the fusion-cutting blades is a die in which fusion-cutting blades  25  are formed at peripheral edges of recesses  26  along outlines of the design to be formed in the decorative piece material  91 . If the fusion-cutting blades  25  come into surface contact with the decorative piece material  91  that has been shaped using the engraved die  22 , the dielectric heating efficiency decreases, resulting in a deformation or the like of the already shaped decorative piece material  91 . For this reason, it is desirable that, as illustrated in  FIG. 3 , the fusion-cutting blades  25  have a sharper angle than the engraved die  22  so as not to come into surface contact with the decorative piece material  91 . In a state in which the decorative piece material  91  that has been shaped through the shaping step is placed on top of the first flat-plate die  20 , with the double-sided tape  94  and the release paper  95  disposed on or attached to the decorative piece material  91 , the engraved die  24  with the fusion-cutting blades is brought closer to the first flat-plate die  20  as illustrated in  FIG. 3( e ) , and high-frequency dielectric heating is performed. Thus, the decorative piece material  91  and the double-sided tape  94  are fusion-cut or cut by the fusion-cutting blades  25  as illustrated in  FIG. 3( f ) . The release paper  95  is not cut by the fusion-cutting blades  25 . 
     As a result of the above-described fusion-cutting step, the shaped and fusion-cut design and unnecessary portions of the decorative piece material  91  remain on the release paper  95  in a state in which the design and the unnecessary portions are separately attached to the double-sided tape  94 . After that, the unnecessary portions are eliminated, and an application film is attached to the upper layer  92  side of the decorative piece material  91  so as to prevent displacement of the design. Thus, a decorative piece  90  can be obtained. Examples of the application film include, but are not limited to, sheets in which an acrylic pressure-sensitive adhesive is applied to a polyester film or paper. 
     The obtained decorative piece  90  can be affixed to a product by peeling off the release paper  95  and attaching the decorative piece  90  to the product via the double-sided tape  94  in a state in which the application film or the like is attached to the decorative piece  90 , and then peeling off the application film or the like. 
     According to the first embodiment of the present invention, a decorative piece  90  can be produced by performing the shaping step and the fusion-cutting step by replacing the dies after the softening step. 
     As described above, replacement of the dies is needed when producing the decorative piece  90 . Hereinafter, a production device  10  with which a decorative piece  90  can be produced by favorably replacing the dies will be described. 
     Production Device of First Embodiment 
       FIGS. 4 and 5  show an example of the production device  10  that can be used in the present embodiment. The production device  10  may be constituted by a first jig  30  shown in  FIG. 4  and a second jig  50  shown in  FIG. 5 . The first jig  30  and the second jig  50  constitute the production device  10  in which, as shown in  FIG. 10 , which will be described later, the first jig  30  is arranged on the lower side and the second jig  50  is arranged on the upper side. 
     In the first jig  30 , as shown in  FIG. 4 , a rectangular first frame  32  is mounted on an upper surface of a rectangular bottom plate  31 . As shown in  FIG. 4( c ) , the first frame  32  includes first guide members  33  on an inner surface side thereof in a left-right direction, which is a width direction, the first guide members  33  extending parallel to each other. 
     A first slide plate  34  is slidably engaged with the first guide members  33 . The first slide plate  34  has a length that is ⅔ of the length of the first frame  32  (first guide members  33 ). A plurality of tapped holes  35  to which a die, which will be described later, is to be fastened are formed in the first slide plate  34 , and two dies can be mounted on the first slide plate  34  in a length direction. 
     Also, pin holes  37  for achieving alignment with the second jig  50  are formed at a plurality of locations in the first frame  32 . 
     Means for preventing displacement such as magnets  38  and  39  are arranged in end faces in the length direction of the first frame  32  and the first slide plate  34 , and when the first slide plate  34  is slid and abutted against the first frame  32 , the magnets  38  and  39  are attracted to each other, thereby restraining the first slide plate  34  from moving freely. 
     The first jig  30  is configured such that one wire (lower board) of a high-frequency molding machine, which is not shown, can be connected to the center of a lower surface of the bottom plate  31 , and high-frequency dielectric heating is applied to a portion indicated by the oblique lines in  FIG. 4 . The region that is subjected to the high-frequency dielectric heating is a region that occupies ½ of the first slide plate  34  in the length direction and ⅓ of the first frame  32  in the length direction and is located centrally in the length direction of the first frame  32 . 
     Therefore, the first jig  30  is configured such that, when the first slide plate  34  is slid in a direction indicated by the arrows in  FIG. 4( a ) , the first slide plate  34  can be slid to the front side, which is the lower side in the paper plane, as shown in  FIGS. 4( a ) and 4( b )  and positioned by the magnets  38  and  39  attracting each other. Moreover, in the case where the first slide plate  34  is slid to the back side, which is the upper side in the paper plane, as well, the first slide plate  34  can be positioned by the magnets  38  and  39  attracting each other. 
     In the second jig  50 , as shown in  FIG. 5 , a rectangular second frame  52  is mounted on a lower surface of a rectangular top plate  51 . The second frame  52  includes second guide members  53  on an inner surface side thereof in the left-right direction, which is the width direction, the second guide members  53  extending parallel to each other. The second guide members  53  are formed so as to extend in the same direction as the first guide members  33 . 
     A second slide plate  54  is slidably engaged with the second guide members  53 . The second slide plate  54  has a length that is ⅔ of the length of the second frame  52  (second guide members  53 ). A plurality of tapped holes  55  to which a die, which will be described later, is to be fastened are formed in the second slide plate  54 , and two dies can be mounted on the second slide plate  54  in the length direction. 
     Also, pin holes  57  for achieving alignment with the first jig  30  are formed at a plurality of locations in the second frame  52 . 
     Means for preventing displacement such as magnets  58  and  59  are arranged in end faces in the length direction of the second frame  52  and the second slide plate  54 , and when the second slide plate  54  is slid and abutted against the second frame  52 , the magnets  58  and  59  are attracted to each other, thereby restraining the second slide plate  54  from moving freely. 
     In the second jig  50 , a cross-shaped bar  51   a  in which a plurality of screw holes are formed is mounted on an upper surface of the top plate  51 , so that the second jig  50  can be fastened to an upper board (not shown) of the high-frequency molding machine, which is not shown, using a bolt or the like. In the second jig  50 , high-frequency dielectric heating is performed on a portion indicated by the oblique lines in  FIG. 5 . The region that is subjected to the high-frequency dielectric heating is a region that occupies ½ of the second slide plate  54  in the length direction and ⅓ of the second frame  52  in the length direction and is located centrally in the length direction of the second frame  52 . This region opposes the high-frequency dielectric heating region of the first jig  30  shown in  FIG. 4 . 
     Therefore, the second jig  50  is configured such that, when the second slide plate  54  is slid in a direction indicated by the arrows in  FIG. 5( a ) , the second slide plate  54  can be slid to the back side, which is the lower side in the paper plane, as shown in  FIGS. 5( a ) and 5( b ) , and positioned by the magnets  58  and  59  attracting each other. Moreover, in the case where the second slide plate  54  is slid to the front side, which is the upper side in the paper plane, as well, the second slide plate  54  can be positioned by the magnets  58  and  59  attracting each other. 
     In the first jig  30  and the second jig  50  described above, dies are mounted on the first slide plate  34  and the second slide plate  54 . 
       FIG. 6  shows the first jig  30  to which dies  40  and  41  are mounted, and  FIG. 7  shows the dies  40  and  41  that are to be mounted to the first jig  30 . The dies  40  and  41  can be mounted on the first slide plate  34  by fastening screws  36  to the tapped holes  35 . The dies to be fastened to the first jig  30  may be the first flat-plate die  40  shown in  FIG. 7( a )  and the first engraved die  41  with fusion-cutting blades shown in  FIG. 7( b ) . The first flat-plate die  40  is a die that has a flat upper surface, and the first engraved die  41  with the fusion-cutting blades is a die in which fusion-cutting blades  42  are formed along the outlines of the design of the decorative piece material  91 . 
       FIG. 8  shows the second jig  50  to which dies  60  and  61  are mounted, and  FIG. 9  shows the dies  60  and  61  that are to be mounted to the second jig  50 . The dies  60  and  61  can be mounted on the second slide plate  54  by fastening screws  56  to the tapped holes  55 . The dies to be fastened to the second jig  50  may be the second flat-plate die  60  shown in  FIG. 9( a )  and the second engraved die  61  shown in  FIG. 9( b ) . The second flat-plate die  60  is a die that has a flat lower surface, and the second engraved die  61  is a die in which recesses  62  of the design of the decorative piece material  91  are formed. For example, recesses  62  that constitute inverted alphabet letters “CHRO” are formed in the second engraved die  61  shown in  FIG. 9 . 
     Then, the first jig  30  and the second jig  50  on which the dies  40  and  41  and the dies  60  and  61  are respectively mounted are fastened to a high-frequency dielectric heating device, which is not shown, such that the first jig  30  is located on the lower side and the second jig  50  is located on the upper side. In order for the first jig  30  and the second jig  50  to be fastened correctly relative to each other in the vertical direction, the positions of both jigs are adjusted by inserting pins (not shown) into the pin holes  37  and  57 . 
     Then, first, the softening step (see  FIG. 2 ) of softening the decorative piece material  91  is performed using the production device  10 . As illustrated in  FIG. 10( a ) , in both the first jig  30  and the second jig  50 , the slide plates  34  and  54  are positioned such that the flat-plate dies  40  and  60  are located centrally (in the portions indicated by the oblique lines in  FIGS. 6 and 8 ), and the decorative piece material  91  is placed on top of the first flat-plate die  40 . In this state, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the flat-plate dies  40  and  60  as electrodes, thereby softening and welding the entire decorative piece material  91 . When the softening is completed, the second jig  50  is moved upward. 
     Subsequently, with the first jig  30  left as it is, the second slide plate  54  of the second jig  50  is slid to the back side, thereby moving the second engraved die  61  to the center (the portion indicated by the oblique lines in  FIG. 8 ) as illustrated in  FIG. 10( b ) . Then, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the first flat-plate die  40  and the second engraved die  61  as electrodes (shaping step in  FIGS. 3( a ) to 3( c ) ). Since the entire decorative piece material  91  is softened due to the softening step, the decorative piece material  91  is shaped in conformity with the recesses  62  of the second engraved die  61  through high-frequency dielectric heating, and thus the design is formed therein as projections and recesses. When the shaping is completed, the decorative piece material  91  is temporarily cooled to fix the shape. 
     Next, as illustrated in  FIG. 10( c ) , the first slide plate  34  of the first jig  30  is slid to the back side, thereby moving the first engraved die  41  with the fusion-cutting blades to the center (the portion indicated by the oblique lines in  FIG. 6 ), and the second slide plate  54  of the second jig  50  is slid to the front side, thereby moving the second flat-plate die  60  to the center (the portion indicated by the oblique lines in  FIG. 8 ). Then, the decorative piece material  91  is disposed, with its surface that has served as the lower surface in the shaping step facing upward, such that the shaped design is fitted into the first engraved die  41  with the fusion-cutting blades. The double-sided tape  94  to which the release paper  95  is attached is placed on or attached to the decorative piece material  91  from above such that the release paper  95  is located on the upper side. In this state, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the first engraved die  41  with the fusion-cutting blades and the second flat-plate die  60  as electrodes (fusion-cutting step in  FIGS. 3( d ) to 3( f ) ). Thus, the decorative piece material  91  and the double-sided tape  94  are fusion-cut along the outlines of the design by the fusion-cutting blades  42 . After that, the second jig  50  is moved upward, and the decorative piece material  91  is removed. 
     Since the removed decorative piece material  91  is attached to the release paper  95  via the double-sided tape  94 , the decorative piece material  91  can be removed from the production device  10  without positional displacement occurring. In this state, unnecessary portions are eliminated from the decorative piece material  91 , and the application film  96  is attached to a surface of the decorative piece material  91  on the opposite side to the release paper  95 . Thus, a decorative piece  90  can be obtained as illustrated in  FIG. 10( d ) . 
     The obtained decorative piece  90  can be affixed to a product without positional displacement occurring, by peeling off the release paper  95 , attaching the decorative piece  90  to the product via the double-sided tape  94 , and then peeling off the application film  96 . 
     In the above-described embodiment, the slide plates  34  and  54  are respectively disposed in the first jig  30  and the second jig  50 , and different types of dies are fastened to these slide plates  34  and  54 . Therefore, replacement of the dies can be achieved simply by sliding the slide plates  34  and  54 , and the softening step ( FIG. 2 ), the shaping step ( FIGS. 3( a ) to 3( c ) ), and the fusion-cutting step ( FIGS. 3( d ) to 3( f ) ) can be performed immediately one after another using the same device. 
     Moreover, since the softening step allows the entire decorative piece material  91  to be softened in advance even when the decorative piece material  91  is thick, the above-described embodiment is particularly preferable for the production of a bulky decorative piece  90  having a three-dimensional appearance and a sense of luxuriousness. For example, if a decorative piece material  91  that is 2.3 mm to 6 mm thick is used, a decorative piece  90  having a thickness of 2.5 mm to 6.2 mm can be produced. 
     Second Embodiment 
     In a second embodiment, after the softening step, shaping and fusion-cutting are performed in one step. Note that, unless otherwise specified, the same reference numerals as those of the first embodiment denote the same or similar members, and a description thereof is omitted as appropriate. 
     As is the case with the first embodiment, the decorative piece material  91  is subjected to the softening step illustrated in  FIG. 2 . 
     Then, the decorative piece material  91  that is softened in its entirety is subjected to a shaping and fusion-cutting step illustrated in  FIGS. 11( a ) to 11( c ) . The shaping and fusion-cutting step can be performed by performing high-frequency dielectric heating using the flat-plate die  20  on one hand and the engraved die  24  with the fusion-cutting blades, in which the recesses  26  of the design are formed and the fusion-cutting blades  25  are formed along the outlines of the design, on the other hand. The engraved die  24  with the fusion-cutting blades shown in  FIGS. 11( a ) to 11( c )  is a die in which the recesses  26  are formed to have a depth that is greater than the thickness of a decorative piece  90  to be obtained. 
     The engraved die  24  with the fusion-cutting blades is used in place of the second flat-plate die  21  used in the softening step (see  FIG. 2 ), and as illustrated in  FIG. 11( a ) , the decorative piece material  91  that is in the softened state due to the softening step is placed on top of the flat-plate die  20 , with the release paper  95  disposed on the lower layer  93  side of the decorative piece material  91 , or attached to the decorative piece material  91 , via the double-sided tape  94 . Then, as illustrated in  FIG. 11( b ) , the engraved die  24  with the fusion-cutting blades is brought closer to the flat-plate die  20 , and high-frequency dielectric heating is performed. Thus, the decorative piece material  91  is shaped as illustrated in  FIG. 11( b ) . In the present embodiment, since the recesses  26  of the engraved die  24  with the fusion-cutting blades are formed to have a depth that is greater than the thickness of the decorative piece  90 , a top portion of the decorative piece  90  is shaped without abutting against a bottom surface of the die. As a result, a decorative piece  90  with a design having a slightly round-shaped curve can be obtained. Moreover, the decorative piece material  91  is fusion-cut or cut together with the double-sided tape  94  by the fusion-cutting blades  25  as illustrated in  FIGS. 11( b ) and 11( c ) . 
     After that, unnecessary portions of the decorative piece material  91  are eliminated, and the application film  96  is attached to the upper layer  92  side of the decorative piece material  91  so as to prevent displacement of the design, and thus, a decorative piece  90  can be obtained. 
     According to the second embodiment of the present invention, a decorative piece  90  can be produced by performing the shaping and fusion-cutting step by replacing the die after the softening step. 
     As described above, replacement of the die is needed when producing the decorative piece  90 . Hereinafter, a production device  10  with which a decorative piece  90  can be produced by favorably replacing the die will be described. 
     Production Device of Second Embodiment 
     In the present embodiment, the production device  10  shown in  FIGS. 4 and 5  is used in which dies different from those of the first embodiment are mounted as the production device  10 . Specifically, in the first jig  30 , as illustrated in  FIGS. 12( a ) and 12( b ) , only the first flat-plate die  40  is mounted on the first slide plate  34 , while in the second jig  50 , the second flat-plate die  60  illustrated in  FIG. 12( a )  and a second engraved die  64  with fusion-cutting blades are mounted on the second slide plate  54 . Note that the second engraved die  64  with the fusion-cutting blades has recesses  65  having a depth that is greater than the thickness of the decorative piece  90  to be obtained, and includes fusion-cutting blades  66  at peripheral edges of the recesses  65 . 
     Then, the first jig  30  and the second jig  50  to which the die  40  and the dies  60  and  64  are respectively mounted are fastened to a high-frequency dielectric heating device, which is not shown, such that the first jig  30  is located on the lower side and the second jig  50  is located on the upper side. 
     Then, as is the case with the first embodiment, the softening step (see  FIG. 2 ) of softening the decorative piece material  91  is performed using the production device  10 . As illustrated in  FIG. 12( a ) , in both the first jig  30  and the second jig  50 , the slide plates  34  and  54  are positioned such that the flat-plate dies  40  and  60  are located centrally, and the decorative piece material  91  is placed on top of the first flat-plate die  40 . In this state, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the flat-plate dies  40  and  60  as electrodes, thereby softening and welding the entire decorative piece material  91 . When the softening is completed, the second jig  50  is moved upward. 
     Subsequently, with the first jig  30  left as it is, the second slide plate  54  of the second jig  50  is slid, thereby moving the second engraved die  64  with the fusion-cutting blades to the center as illustrated in  FIG. 12( b ) . Then, the double-sided tape  94  to which the release paper  95  is attached is disposed on the first flat-plate die  40  of the first jig  30  or attached to the decorative piece material  91 , and the decorative piece material  91  is placed thereon with the upper layer  92  facing upward. Subsequently, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the first flat-plate die  40  and the second engraved die  64  with the fusion-cutting blades as electrodes (shaping step in  FIGS. 11( a ) to 11( c ) ). Since the entire decorative piece material  91  is softened due to the softening step, the decorative piece material  91  is shaped within the recesses  65  of the second engraved die  64  with the fusion-cutting blades through high-frequency dielectric heating, and thus, a design with a slightly round-shaped surface is formed. Moreover, the decorative piece material  91  and the double-sided tape  94  are fusion-cut along the outlines of the design by the fusion-cutting blades  66 . After that, the second jig  50  is moved upward, and the decorative piece material  91  is removed. 
     Since the removed decorative piece material  91  is attached to the release paper  95  via the double-sided tape  94 , the decorative piece material  91  can be removed from the production device  10  without positional displacement occurring. In this state, unnecessary portions are eliminated from the decorative piece material  91 , and the application film  96  is attached to a surface of the decorative piece material  91  on the opposite side to the release paper  95 . Thus, a decorative piece  90  can be obtained as illustrated in  FIG. 12( c ) . 
     In the above-described production device  10 , the slide plates  34  and  54  are respectively disposed in the first jig  30  and the second jig  50 , and different types of dies are fastened to these slide plates  34  and  54 . However, in the first jig  30 , the first flat-plate die  40  may be disposed non-slidably. 
     In the present embodiment as well, replacement of the die can be achieved simply by sliding the second slide plate  54 , and the softening step ( FIG. 2 ), the shaping and fusion-cutting step ( FIGS. 11( a ) - 11  ( c )) can be performed immediately one after the other using the same device. 
     Moreover, since the softening step allows the entire decorative piece material  91  to be softened in advance even when the decorative piece material  91  is thick, the above-described embodiment is particularly preferable for the production of a bulky decorative piece  90  having a three-dimensional appearance and a sense of luxuriousness. For example, if a decorative piece material  91  that is 2.3 mm to 6 mm thick is used, a decorative piece  90  having a thickness of 2.5 mm to 6.2 mm can be produced. 
     Third Embodiment 
     In a third embodiment, after the softening step, a shaping step and a fusion-cutting step are performed as is the case with the first embodiment. Note that, unless otherwise specified, the same reference numerals as those of the first embodiment and the second embodiment denote the same or similar members, and a description thereof is omitted as appropriate. 
     As is the case with the first embodiment and the second embodiment, the decorative piece material  91  is subjected to the softening step illustrated in  FIG. 2 . 
     After the softening step, in the third embodiment, the decorative piece material  91  is shaped as illustrated in  FIGS. 13( a ) to 13( c )  (shaping step), and subsequently the shaped decorative piece material  91  is fusion-cut as illustrated in  FIGS. 13( d ) to 13( f )  (fusion-cutting step). 
     In the shaping step, as illustrated in  FIG. 13( a ) , the first flat-plate die  20  used in the softening step in  FIG. 2  is used, and the engraved die  24  with the fusion-cutting blades is used in place of the second flat-plate die  21 . As illustrated in  FIG. 13( a ) , the engraved die  24  with the fusion-cutting blades is a die in which the recesses  26  of the design are formed and the fusion-cutting blades  25  are formed along the outlines of the design. While the decorative piece material  91  that is in the softened state due to the softening step is still placed on top of the first flat-plate die  20 , the engraved die  24  with the fusion-cutting blades is brought closer to the first flat-plate die  20  as illustrated in  FIG. 13( b ) , and high-frequency dielectric heating is performed. Thus, the decorative piece material  91  is shaped in conformity with the recesses  26  of the engraved die  24  with the fusion-cutting blades. At this time, the decorative piece material  91  is partially fusion-cut by the fusion-cutting blades  25 . In the shaping step, since the decorative piece material  91  that is softened in its entirety in advance is shaped, the shaping can be performed even when the decorative piece material  91  is thick. After the shaping, the decorative piece material  91  is held on the engraved die  24  with the fusion-cutting blades using gummed tape or the like, and in this state, the engraved die  24  with the fusion-cutting blades is moved upward as illustrated in  FIG. 13( c ) . Then, the procedure proceeds to the fusion-cutting step. 
     In the fusion-cutting step, the first flat-plate die  20  is replaced with a flat-plate die  27  with cushioning materials in which, as illustrated in  FIG. 13( d ) , cushioning material recesses  28  are formed at positions corresponding to respective portions of the design, the cushioning material recesses  28  being smaller than the respective portions of the design by about 0.3 mm to 1 mm, and cushioning materials  29  are arranged in the cushioning material recesses  28 . The cushioning materials  29  may be made of cellular rubber, for example, and has such a thickness that the cushioning materials  29  protrude from the cushioning material recesses  28  for about 0.2 mm to 0.4 mm. 
     Then, as illustrated in  FIG. 13( d ) , the release paper  95  is disposed on the lower layer  93  side of the decorative piece material  91 , on top of the flat-plate die  27  with the cushioning materials in  FIG. 13( d ) , with the double-sided tape  94  located on the upper side. 
     Subsequently, as illustrated in  FIG. 13( e ) , the engraved die  24  with the fusion-cutting blades on which the decorative piece material  91  is held is brought closer to the flat-plate die  27  with the cushioning materials, and high-frequency dielectric heating is performed. Due to the repulsive force of the cushioning materials  29 , the decorative piece material  91  is strongly pressed against and hence attached to the double-sided tape  94 , and is also fusion-cut or cut by the fusion-cutting blades  25 . Note that the release paper  95  is not cut by the fusion-cutting blades  25 . 
     After that, unnecessary portions of the decorative piece material  91  are eliminated, and the application film  96  is attached to the upper layer  92  side of the decorative piece material  91  so as to prevent displacement of the design. Thus, a decorative piece  90  can be obtained. 
     According to the third embodiment of the present invention, a decorative piece  90  can be produced by performing the shaping and fusion-cutting step by replacing the dies after the softening step. 
     As described above, replacement of the dies is needed when producing a decorative piece  90 . Hereinafter, a production device  10  with which a decorative piece  90  can be produced by favorably replacing the dies will be described. 
     Production Device of Third Embodiment 
     In the present embodiment, the production device  10  shown in  FIGS. 4 and 5  is used in which dies different from those of the first embodiment are mounted as the production device  10 . Specifically, in the first jig  30 , as illustrated in  FIGS. 14( a ) and 14( b ) , the first flat-plate die  40  and a flat-plate die  44  with cushioning materials (see  FIG. 15 ) are mounted on the first slide plate  34 . Note that the flat-plate die  44  with the cushioning materials is a die in which cushioning material recesses  45  are formed at positions corresponding to and inward of respective portions of the design as described above and cushioning materials  46  are arranged in the cushioning material recesses  45 . In the second jig  50 , the second flat-plate die  60  shown in  FIG. 16( a )  and the second engraved die  64  with the fusion-cutting blades (see  FIG. 17 ) are mounted on the second slide plate  54 . Moreover, in the present embodiment, the design to be applied to the decorative piece  90  is “SUPER”. 
     Then, the first jig  30  and the second jig  50  to which the dies  40  and  44  and the dies  60  and  64  are respectively mounted are fastened to a high-frequency dielectric heating device, which is not shown, such that the first jig  30  is located on the lower side and the second jig  50  is located on the upper side. 
     Then, as is the case with the first embodiment, the softening step (see  FIG. 2 ) of softening the decorative piece material  91  is performed using the production device  10 . As illustrated in  FIG. 18( a ) , in both the first jig  30  and the second jig  50 , the slide plates  34  and  54  are positioned such that the flat-plate dies  40  and  60  are located centrally, and the decorative piece material  91  is placed on top of the first flat-plate die  40  such that the upper layer  92  faces upward. In this state, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the flat-plate dies  40  and  60  as electrodes, thereby softening and welding the entire decorative piece material  91 . When the softening is completed, the second jig  50  is moved upward. 
     Subsequently, with the first jig  30  left as it is, the second slide plate  54  of the second jig  50  is slid, thereby moving the second engraved die  64  with the fusion-cutting blades to the center as illustrated in  FIG. 18( b ) . Then, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed using the first flat-plate die  40  and the second engraved die  64  with the fusion-cutting blades as electrodes (shaping step in  FIGS. 13( a ) to 13( c ) ). Since the entire decorative piece material  91  is softened due to the softening step, the decorative piece material  91  is shaped in conformity with the recesses  65  of the second engraved die  64  with the fusion-cutting blades through high-frequency dielectric heating. Moreover, the decorative piece material  91  is partially fusion-cut by the fusion-cutting blades  66 . After that, the decorative piece material  91  is cooled. The cooling may be performed through natural cooling, for example, or may be performed through water-cooling or the like of the dies or the like with use of a chiller in order to shorten the cooling time. 
     In this state, the decorative piece material  91  is held on the second engraved die  64  with fusion-cutting blades using gummed tape or the like, and the second jig  50  is moved upward as illustrated in  FIG. 18( b ) . 
     Next, as illustrated in  FIG. 18( c ) , the first slide plate  34  of the first jig  30  is slid to the back side, thereby moving the flat-plate die  44  with the cushioning materials to the center (a portion indicated by the oblique lines in  FIG. 14( a ) ). Then, the double-sided tape  94  to which the release paper  95  is attached is placed on top of the flat-plate die  44  with the cushioning materials such that the release paper  95  is located on the lower side. In this state, the second jig  50  is moved downward, and while the decorative piece material  91  is thereby pressed, high-frequency dielectric heating is performed again using the flat-plate die  44  with the cushioning materials and the second engraved die  64  with the fusion-cutting blades as electrodes (fusion-cutting step in  FIGS. 13( d ) to 13( f ) ). The cushioning materials  46  allow the decorative piece material  91  to be strongly attached to the double-sided tape  94 , and the decorative piece material  91  and the double-sided tape  94  are fusion-cut by the fusion-cutting blades  66  along the outlines of the design by the fusion-cutting blades  66 . After that, the second jig  50  is moved upward, and the decorative piece material  91  is removed. 
     Since the removed decorative piece material  91  is attached to the release paper  95  via the double-sided tape  94 , the decorative piece material  91  can be removed from the production device  10  without positional displacement occurring. In this state, unnecessary portions are eliminated from the decorative piece material  91 , and the application film  96  is attached to a surface of the decorative piece material  91  on the opposite side of the release paper  95 . Thus, a decorative piece  90  can be obtained as illustrated in  FIG. 18( d ) . 
     The obtained decorative piece  90  can be affixed to a product without positional displacement occurring, by peeling off the release paper  95 , attaching the decorative piece  90  to the product via the double-sided tape  94 , and then peeling off the application film  96 . 
     In the above-described embodiment, the slide plates  34  and  54  are respectively disposed in the first jig  30  and the second jig  50 , and different types of dies are fastened to these slide plates  34  and  54 . Therefore, replacement of the dies can be achieved simply by sliding the slide plates  34  and  54 , and the softening step ( FIG. 2 ), the shaping step ( FIGS. 13( a ) to 13( c ) ), and the fusion-cutting step ( FIGS. 13( d ) to 13( f ) ) can be performed immediately one after another using the same device. 
     Moreover, since the softening step allows the entire decorative piece material  91  to be softened in advance even when the decorative piece material  91  is thick, the above-described embodiment is particularly preferable for the production of a bulky decorative piece  90  having a three-dimensional appearance and a sense of luxuriousness. For example, if a decorative piece material  91  that is 2.3 mm to 6 mm thick is used, a decorative piece  90  having a thickness of 2.5 mm to 6.2 mm can be produced. 
     The foregoing description is given merely to describe the present invention, and therefore should not be construed as limiting the invention recited in the appended claims or narrowing the scope of the present invention. Also, the constituent elements of the present invention are not limited to those described in the embodiments above, and it is of course possible to make various modifications within the technical scope defined in the appended claims. 
     It is also possible to combine the dies of the foregoing first to third embodiments. Moreover, the types of the dies that are mounted to the first jig  30  and the second jig  50  are not limited to those described above in the embodiments, and it is of course also possible to exchange the positions of the upper and lower dies, for example. Furthermore, regarding the shape of the recesses of the dies, any shapes, such as a mountain shape, a trapezoidal shape, and a round shape, and combinations of these shapes can be adopted. 
     In the embodiments, a plurality of dies are mounted to the first jig  30  and the second jig  50  in order to simplify the die replacement. However, it is of course also possible to realize the present invention in a manner in which dies are replaced as appropriate, or dies are respectively mounted on a plurality of high-frequency induction heating devices. 
     In addition, the layer configurations, the materials, and the like of the decorative piece material  91  are given by way of example only, and it should be understood that various changes can be made thereto. 
     LIST OF REFERENCE NUMERALS 
     
         
         
           
               10  Production device 
               20  First flat-plate die 
               21  Second flat-plate die 
               22  Engraved die 
               24  Engraved die with fusion-cutting blade 
               30  First jig 
               34  First slide plate 
               40  First flat-plate die 
               41  First engraved die with fusion-cutting blade 
               44  Flat plate die with cushioning material 
               50  Second jig 
               54  Second slide plate 
               60  Second flat-plate die 
               61  Second engraved die 
               64  Second engraved die with fusion-cutting blade 
               90  Decorative piece 
               91  Decorative piece material