JP5608518B2 - Resin sheet manufacturing apparatus and resin sheet manufacturing method - Google Patents

Description

  The present invention relates to a resin sheet manufacturing apparatus having a plurality of protrusions and grooves between the protrusions on one side, and more specifically, the grooves and protrusions on the outer peripheral surface of an endless metal strip heated by high frequency induction heating. The present invention relates to a resin sheet manufacturing apparatus and a resin sheet manufacturing method for obtaining the resin sheet by transferring the shape of the stripe to one side of the resin sheet.

  Conventionally, synthetic resin films having irregularities on the surface have been widely used for solar cell sealing films, liquid crystal display optical films, laminated glass inner films, and the like. When manufacturing such a synthetic resin film, a method of pressing a molten resin extruded by a melt extrusion method between a mold roll having an uneven surface and a pressure roll, and a transfer material having an uneven surface on an outer surface A method of heating and pressing the surface of the synthetic resin film is used.

  For example, Patent Document 1 below discloses a thermoplastic resin sheet processing apparatus schematically shown in FIG.

  In the sheet processing apparatus 101 shown in FIG. 10, the thermoplastic resin sheet 103 wound around the supply roll 102 is fed out. The thermoplastic resin sheet 103 is guided between the mold roll 104 and the pressure roll 105. The mold roll 104 is made of metal. The mold roll 104 has irregularities on the outer surface. A heating device 106 is provided on the upstream side in the rotational direction of the mold roll 104 from the portion where the thermoplastic resin sheet 103 is supplied to the outer surface of the mold roll 104. The mold roll 104 is heated by the heating device 106. By pressing the thermoplastic resin sheet 103 between the heated mold roll 104 and the pressure-bonding roll 105, the uneven shape of the outer surface of the mold roll 104 can be transferred to the thermoplastic resin sheet 103.

  In the sheet processing apparatus 101, an endless belt 109 is stretched between the pressure-bonding roll 105 and the rolls 107 and 108. The endless belt 109 is in close contact with the thermoplastic resin sheet 103 on the outer surface of the mold roll 104. The endless belt 109 cools the thermoplastic resin sheet 103 provided with the uneven shape, and the thermoplastic resin sheet 103 is peeled off from the mold roll 104 relatively easily.

  Patent Document 2 below describes a method of using high-frequency induction heating as an apparatus for heating the mold roll when transferring the concavo-convex shape to the thermoplastic resin sheet using the mold roll.

JP-A-10-291251 Japanese Patent No. 4232608

  In the sheet processing apparatus 101 described in Patent Document 1, a thermoplastic resin sheet having irregularities on the surface can be obtained. However, in the sheet processing apparatus 101, a heating apparatus that applies radiant heat is used as the heating apparatus 106. For this reason, there exists a problem that energy efficiency is low.

  Furthermore, in the sheet processing apparatus 101, it is difficult to accurately form fine irregularities on the surface of the thermoplastic resin sheet.

  In addition, Patent Document 1 describes that, by using a thermoplastic resin composition in which a plasticizer is added to soft polyvinyl chloride having a relatively low viscosity among thermoplastic resins, the transferability of unevenness is improved. Yes. However, particularly when a thermoplastic resin having a relatively high viscosity is used, it is extremely difficult to accurately form fine irregularities on the surface of the thermoplastic resin sheet by the sheet processing apparatus 101. Moreover, in order to make a viscosity low, the additive etc. which reduce a viscosity must be mix | blended, There exists a restriction | limiting in the kind of thermoplastic resin which can be used, and the composition of a thermoplastic resin composition.

  The method described in Patent Document 2 has high thermal efficiency because the mold roll is heated using high-frequency induction heating. However, heat easily diffuses in the metal roll. For this reason, in order to maintain the surface temperature of the mold roll at a relatively high temperature suitable for transferring the concavo-convex shape, a considerable amount of power must be supplied. Furthermore, even if the manufacturing method described in Patent Document 2 is used, it is difficult to accurately form fine irregularities on the surface of the resin sheet. For example, it is extremely difficult to accurately form irregularities having an aspect ratio exceeding 0.5, which corresponds to the ratio of height to width, in the convex / concave section of the irregularities, and accurately forming irregularities having an aspect ratio exceeding 2. There is a problem that it is much more difficult to do.

  An object of the present invention relates to a resin sheet manufacturing apparatus and a resin sheet manufacturing method capable of accurately forming a plurality of fine protrusions and a plurality of grooves on one surface of a resin sheet.

  According to a wide aspect of the present invention, there is provided an apparatus for producing a resin sheet having a plurality of protrusions and grooves between the protrusions on one side, a temperature control roll having a metal roll body, and a resin sheet. An endless metal strip having grooves and ridges corresponding to the shapes of the ridges and grooves formed on one side, an outer peripheral surface of the temperature control roll, and an inner peripheral surface of the endless metal strip The low relative permeability layer having a lower relative permeability than the endless metal strip, and the endless metal strip is in contact with the temperature control roll via the low relative permeability layer. While the temperature control roll is rotating in a state, a shape for bringing the resin sheet into contact with the outer peripheral surface of the endless metal strip and imparting the shape of the protrusion and the groove to one surface of the resin sheet On the outer peripheral surface of the applying device and the endless metal strip An electromagnetic induction heating device for heating the endless metal strip upstream of the position where the fat sheet is contacted, and the length direction of the groove and the protrusion in the transport direction of the endless metal strip The endless metal strip has the groove and the protrusion on the outer peripheral surface, so that a resin sheet manufacturing apparatus is provided.

  On the specific situation with the manufacturing apparatus of the resin sheet which concerns on this invention, the said low relative magnetic permeability layer is integrally provided in the outer peripheral surface of the said metal roll main body of the said temperature control roll. In this case, the size of the manufacturing apparatus can be reduced. Furthermore, a magnetic field for generating an eddy current in the endless metal strip can be confined in the endless metal strip by a material having a low relative permeability.

  In another specific aspect of the resin sheet manufacturing apparatus according to the present invention, the low relative permeability layer is integrally provided on an outer peripheral surface of the metal roll body of the temperature control roll, and the low ratio The endless metal strip is integrally provided on the outer peripheral surface of the magnetic permeability layer. In this case, the size of the manufacturing apparatus can be reduced. Furthermore, it is possible to reduce the number of members used and the cost of the manufacturing apparatus.

  In still another specific aspect of the resin sheet manufacturing apparatus according to the present invention, the endless metal strip is an endless metal belt, the temperature control roll has a plurality of temperature control rolls, and the endless metal belt is It is passed over several temperature control rolls. In this case, the temperature of the endless metal strip can be controlled with higher accuracy.

  In another specific aspect of the resin sheet manufacturing apparatus according to the present invention, the shape imparting apparatus is a pressure roll for pressure bonding a resin sheet to the outer peripheral surface of the endless metal strip, and the pressure roll is the above-described pressure roll. It arrange | positions so that it may have a clearance gap between temperature control rolls, and in this clearance gap, a resin sheet is crimped | bonded by the said crimping | compression-bonding roll to the outer peripheral surface of the said endless metal strip.

  In the apparatus for producing a resin sheet according to the present invention, the shape imparting device is not limited to a pressure roll, but may be an edge pinning device or an air knife.

  In still another specific aspect of the resin sheet production apparatus according to the present invention, the apparatus further comprises a melt extrusion apparatus for extruding the molten resin into a sheet shape, and on one side of the resin sheet extruded by the melt extrusion apparatus, The shape of the said protrusion and the said groove | channel is provided. That is, the shape which reversed the shape of the said groove | channel and the said protrusion of the said endless metal strip is provided to the single side | surface of a resin sheet. In this case, since the resin sheet that is at a relatively high temperature from the beginning is used by being melt-extruded, the shape of the ridges and grooves can be more easily and accurately applied to one side of the resin sheet. Can do.

  In still another specific aspect of the resin sheet manufacturing apparatus according to the present invention, the temperature control roll has a hollow portion inside the metal roll body, and a refrigerant supply device for supplying a refrigerant to the hollow portion Have In this case, the metal roll body can be cooled by the refrigerant, and the resin sheet provided with the shapes of the protrusions and the grooves can be easily peeled from the outer peripheral surface of the endless metal strip.

  In the groove on the outer peripheral surface of the endless metal strip, the aspect ratio of the cross section in the width direction of the groove in the direction orthogonal to the transport direction of the endless metal strip is preferably 0.5 or more. Preferably there is. Thereby, in the protrusion on one side of the resin sheet, the aspect ratio of the cross section in the width direction of the protrusion is 0.5 or more or 2 or more in the direction orthogonal to the conveying direction of the resin sheet when obtaining the resin sheet Sheets can be provided.

  The resin sheet manufacturing method according to the present invention is a manufacturing method using the resin sheet manufacturing apparatus according to the present invention, the step of rotating the temperature control roll to convey the endless metal strip, and the endless The step of heating the metal strip by the electromagnetic induction heating device, and the downstream side of the transport direction of the endless metal strip from the position heated by the electromagnetic induction heating device of the endless metal strip being transported, In at least a part of the transport direction of the endless metal strip, at least in the transport direction of the endless metal strip, the endless metal strip is brought into contact with the temperature control roll through the low relative permeability layer. In some of the above regions, a step of bringing the resin sheet into contact with the outer peripheral surface of the endless metal strip and imparting the shape of the protrusion and the groove to one surface of the resin sheet; and the protrusion And a resin sheet shape is imparted between the grooves, and a step of peeling the outer peripheral surface of the endless metal strips.

  According to the resin sheet manufacturing apparatus and the resin sheet manufacturing method of the present invention, the endless metal strip is heated by an electromagnetic induction heating device having excellent thermal efficiency, and the heated endless metal strip is made of a material having a low relative permeability. Since the resin sheet is brought into contact with the outer peripheral surface of the endless metal strip while the temperature control roll is rotating while in contact with the temperature control roll, the groove between the outer peripheral surface of the endless metal strip and the protrusion The shape can be transferred to one side of the resin sheet with high accuracy.

  In addition, since the electromagnetic induction heating device having excellent thermal efficiency is used, the endless metal strip is heated to a sufficient temperature at which the shape of the groove and the protrusion can be transferred with high accuracy with a small amount of electric power. Moreover, since the endless metal strip is in contact with the metal roll body via a material having a low relative permeability, the magnetic field can be concentrated in the endless metal strip. For this reason, an eddy current can be generated more efficiently.

  And since the said endless metal strip has the said groove | channel and the said protrusion on an outer peripheral surface so that the length direction of the said groove | channel and the said protrusion may extend in the conveyance direction of the said endless metal strip, A plurality of fine ridges and a plurality of grooves can be accurately formed on one surface.

FIG. 1A is a schematic configuration diagram of a resin sheet manufacturing apparatus according to an embodiment of the present invention, FIG. 1B is an enlarged cross-sectional view showing an essential part thereof, and FIG. It is a partial notch front sectional drawing which shows the resin sheet obtained by one Embodiment. FIG. 2 is a partially enlarged cross-sectional view showing the configuration of the temperature control roll, the low relative permeability layer, and the endless metal strip used in the first embodiment of the present invention. FIG. 3A is a cross-sectional view in a direction orthogonal to the transport direction of the endless metal strip, and FIG. 3B is a cross-sectional view in the transport direction of the endless metal strip. FIG. 4 is a partially cutaway cross-sectional view showing an application example of the resin sheet obtained in the first embodiment of the present invention. FIG. 5 is a partially cutaway cross-sectional view showing a modified example of the resin sheet obtained in the first embodiment of the present invention. FIG. 6 is a schematic configuration diagram of a resin sheet manufacturing apparatus according to the second embodiment of the present invention. FIG. 7 is a schematic configuration diagram of a resin sheet manufacturing apparatus according to the third embodiment of the present invention. FIG. 8 is a schematic diagram for explaining a modification of the resin sheet manufacturing apparatus shown in FIG. 1. FIG. 9 is a cross-sectional view of a resin sheet that was attempted to be produced in Comparative Examples 3-4 and Reference Examples 1-2. FIG. 10 is a schematic configuration diagram for explaining a conventional thermoplastic resin sheet processing apparatus.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

(First embodiment)
Fig.1 (a) is a schematic block diagram which shows the manufacturing apparatus of the resin sheet which concerns on the 1st Embodiment of this invention. FIG.1 (b) is the elements on larger scale which show the principal part of the manufacturing apparatus of the resin sheet which concerns on 1st Embodiment. FIG.1 (c) is a partial notch front sectional drawing which shows the resin sheet obtained by 1st Embodiment.

  FIG. 2 is a partially enlarged cross-sectional view showing the configuration of the temperature control roll, the low relative permeability layer, and the endless metal strip used in the first embodiment of the present invention. In FIG. 2, the cross section in the groove part which does not have the protrusion of an endless metal strip is shown.

  As shown in FIG. 1A, a resin sheet manufacturing apparatus 1 includes a melt extrusion apparatus 2 for extruding a molten resin into a sheet shape. For example, the melt extrusion apparatus 2 melts a resin and extrudes it as a resin sheet 3. In the present embodiment, the melt extrusion device 2 is used. However, in the present invention, the melt extrusion device may not be used, and a pre-molded resin sheet may be used.

  Since the resin sheet 3 immediately after being extruded from the melt extrusion apparatus 2 is in a relatively high temperature state, it is easy to impart a fine shape by transfer. Therefore, it is preferable to use the melt extrusion apparatus 2. When a pre-molded resin sheet is used, it is necessary to sufficiently heat the resin sheet 3 to a temperature necessary for transferring a fine shape in a later process. The said shape is a shape of the some protrusion formed in a resin sheet, and the groove | channel between these protrusions.

  Although it does not specifically limit as said resin, In this embodiment, polymethylmethacrylate which is a thermoplastic resin is used. The resin is preferably a thermoplastic resin, and the resin sheet is preferably a thermoplastic resin sheet. Examples of other thermoplastic resins include polycarbonate, polyethylene terephthalate, polyvinyl butyral, ethylene vinyl alcohol resin, cycloolefin polymer, and cycloolefin copolymer.

  The resin sheet 3 extruded by the melt extrusion apparatus 2 is supplied between the roll 11 and the pressure-bonding roll 7. The roll 11 includes a temperature control roll 4 having a metal roll body 4a. The roll 11 further includes a low relative magnetic permeability layer 5 provided on the outer peripheral surface of the metal roll main body 4 a and an endless metal strip 6 provided on the outer peripheral surface of the low relative magnetic permeability layer 5. The pressure roll 7 is a shape imparting device for imparting the shape of the protrusion 3 a and the groove 3 b to one surface of the resin sheet 3.

  As shown in FIG.1 (b), the temperature control roll 4 has the metal roll main body 4a. The metal roll body 4a is made of metal. The metal is not particularly limited. As the metal, an appropriate metal having high strength such as aluminum, stainless steel or iron is used. The metal roll body 4a is cylindrical. The metal roll body 4a has a hollow portion 4b inside. It is preferable that the temperature control roll 4 has a refrigerant supply device (not shown) for supplying a refrigerant to the hollow portion 4b of the metal roll body 4a. Examples of the refrigerant include air. However, the refrigerant supply device is not essential.

  A low relative permeability layer 5 is provided on the outer peripheral surface of the metal roll body 4a. The low relative permeability layer 5 is formed of a low relative permeability material having a low relative permeability. The low relative magnetic permeability layer 5 is provided so as to cover the outer peripheral surface of the metal roll body 4a. The low relative permeability layer 5 is integrated with the metal roll body 4a. That is, in this embodiment, the low relative permeability layer 5 is integrally provided on the outer peripheral surface of the metal roll body 4 a of the temperature control roll 4.

As the low relative permeability material, an appropriate material having a relative permeability lower than that of the endless metal strip is used. Examples of such materials include inorganic compounds such as Cr ₂ O ₃ , Al ₂ O ₃ and a zirconia / calcium oxide mixture, and heat-resistant organic compounds represented by polyimide. In this embodiment, the low relative magnetic permeability layer 5 is formed of Cr ₂ O ₃ .

  The thickness of the low relative permeability layer 5 is not particularly limited. A material having a low relative permeability often has a low thermal conductivity. If the thermal conductivity becomes too low, it becomes difficult to perform appropriate cooling between the position X and the position Z shown in FIG. Therefore, the thickness of the low relative magnetic permeability layer 5 is preferably 5 mm or less. Moreover, since durability will fall when too thin, it is preferable that the thickness of the low relative magnetic permeability layer 5 is 0.001 mm or more. However, the thickness of the low relative permeability layer 5 is appropriately adjusted depending on the material of the low relative permeability layer 5 and is not particularly limited.

  An endless metal strip 6 is provided on the outer peripheral surface of the low relative permeability layer 5. The endless metal strip 6 is integrated with the low relative magnetic permeability layer 5. That is, in the present embodiment, the endless metal strip 6 is integrally provided on the outer peripheral surface of the low relative permeability layer 5.

  The low relative permeability layer may be provided on at least one of the outer peripheral surface of the temperature control roll and the inner peripheral surface of the endless metal strip.

  The endless metal strip 6 is heated by electromagnetic induction heating. For this reason, it is preferable that the endless metal strip 6 is formed of a metal material having a high relative magnetic permeability such as nickel, a nickel alloy, or carbon steel. More specifically, the endless metal strip 6 is preferably formed of a metal material having a relative permeability of 2 or more. Moreover, since it is formed of metal, the endless metal strip 6 is excellent in thermal conductivity, and the temperature control of the endless metal strip 6 is easy. In the present embodiment, the endless metal strip 6 is made of Ni.

  FIG. 3A shows a cross-sectional view in the direction orthogonal to the transport direction of the endless metal strip 6, and FIG. 3B shows a cross-sectional view in the transport direction of the endless metal strip 6. The transport direction of the endless metal strip 6 is the rotational direction of the endless metal strip 6 and the circumferential direction.

  As shown in FIG. 3A, the endless metal strip 6 has a plurality of grooves 6a and a plurality of protrusions 6b on the outer peripheral surface. The groove 6a is disposed between the two protrusions 6b, and the plurality of grooves 6a and the plurality of protrusions 6b are alternately arranged. The grooves 6 a and the protrusions 6 b are regularly provided along a direction orthogonal to the conveying direction of the endless metal strip 6. The shapes of the grooves 6a and the ridges 6b correspond to shapes in which the ridges 3a and the grooves 3b formed on one surface of the finally obtained resin sheet 3 are reversed. The shape of the groove 6a and the protrusion 6b corresponds to the shape of the protrusion 3a and the groove 3b formed on one side of the finally obtained resin sheet 3. By transferring the shape of the groove 6a and the protrusion 6b to the resin sheet 3, the protrusion 3a is formed corresponding to the groove 6a, and the groove 3b is formed corresponding to the protrusion 6b.

  Endless metal strip 6 has grooves 6a and ridges 6b on its outer peripheral surface so that the length direction of grooves 6a and ridges 6b extends in the conveying direction of endless metal strip 6. In other words, endless metal strip 6 has grooves 6a and ridges 6b on the outer peripheral surface so that the length direction of grooves 6a and ridges 6b extends in the rotational direction or circumferential direction of endless metal strip 6. The endless metal strip 6 has grooves 6a and ridges 6b on the outer peripheral surface so that the direction perpendicular to the conveying direction of the endless metal strip 6 is the width direction of the grooves 6a and the ridges 6b. In other words, the conveyance direction of the endless metal strip 6 and the length direction of the groove 6a and the protrusion 6b are substantially parallel. The direction perpendicular to the conveying direction of the endless metal strip 6 is substantially parallel to the width direction of the groove 6a and the protrusion 6b.

  The endless metal strip 6 may be extrapolated to the metal roll body 4a in which the low relative magnetic permeability layer 5 is provided on the outer peripheral surface. A flat endless metal strip may be formed on the outer peripheral surface of the low relative permeability layer 5, and the shape of grooves and protrusions may be provided on the outer peripheral surface of the flat endless metal strip.

  An easily peelable material layer may be formed on the outer peripheral surface of the endless metal strip 6, that is, the surface on the side where the grooves 6 a and the protrusions 6 b are provided. By forming the easily peelable material layer, the peelability of the resin sheet 3 can be enhanced. As the easily peelable material constituting the easily peelable material layer, an organic material such as a fluorine-containing monomolecular film and an inorganic material such as diamond-like carbon are appropriately used.

  As shown in FIG. 1A, the temperature adjusting roll 4 is rotated in the direction of the arrow A shown in the figure by a driving device M such as a motor. The drive device M is a drive device for rotationally driving the temperature adjustment roll 4. The pressure roll 7 is rotatably provided. The pressure-bonding roll 7 is arranged so as to have a gap between it and the temperature control roll 4. In the gap, the resin sheet 3 is crimped to the outer peripheral surface of the endless metal strip 6 by the crimping roll 7. That is, the resin sheet 3 is sandwiched between the endless metal strip 6 located on the outer peripheral surface of the temperature control roll 4 and the pressure-bonding roll 7.

  The pressure roll 7 can be formed of an appropriate metal. The metal is not particularly limited, and examples thereof include stainless steel and iron. In order to enhance the press-bonding property, the press-bonding roll 7 may be a press-bonding roll in which the outer peripheral surface of the press-bonding roll body is coated with a flexible material such as rubber.

  The pressure-bonding roll 7 may be rotationally driven by a driving device (not shown) in the direction opposite to the arrow A direction.

  A position where the resin sheet 3 is sandwiched between the endless metal strip 6 positioned on the outer peripheral surface of the temperature control roll 4 and the pressure-bonding roll 7 and transfer described later is performed is defined as a position X. In order to electromagnetically heat the endless metal strip 6 at a position upstream of the position X in the rotation direction of the temperature control roll 4, that is, a position Y upstream of the endless metal strip 6 in the transport direction, an electromagnetic induction heating device 8 is used. Is arranged. The electromagnetic induction heating device 8 is disposed on the upstream side of the position where the resin sheet 3 is in contact with the outer peripheral surface of the endless metal strip 6. The electromagnetic induction heating device 8 has a coil through which a high-frequency current is passed. The endless metal strip 6 made of metal is electromagnetically heated by the magnetic field generated when a high-frequency current is applied to the coil, and generates heat. In order to give the resin sheet 3 the shapes of the protrusions 3a and the grooves 3b, an electromagnetic induction heating device 8 is used so that the endless metal strip 6 is heated to an appropriate temperature.

  The position Y is not particularly limited as long as it is upstream of the position X in the transport direction of the endless metal strip 6, that is, in the rotational direction of the temperature adjusting roll 4. Preferably, an electromagnetic induction heating device is provided at a position where the shape of the groove 6a and the protrusion 6b of the endless metal strip 6 heated at the position Y can be maintained at a temperature sufficient to transfer the shape to the resin sheet 3 at the position X. It is desirable to arrange 8.

  At least one of the pressure-bonding roll 7 and the temperature adjusting roll 4 may have a larger diameter in the center in the axial direction than the diameter of the end in the axial direction, and may be formed by a barrel-shaped crown roll. Since at least one of the pressure-bonding roll 7 and the temperature control roll 4 is a crown roll, it is possible to suppress dents in the central portion in the axial direction of the roll. Therefore, the accuracy of the shape of the resin sheet can be increased even in the axial center of the roll.

  A roll 9 is disposed so as to be separated from the temperature control roll 4. After the shapes of the protrusions 3a and the grooves 3b are given at the position X, the resin sheet 3 moves together with the temperature control roll 4 while being in contact with the outer peripheral surface of the endless metal strip 6, and at the position Z, the endless metal strip It is peeled from the body 6. The roll 9 is provided to adjust the position Z. That is, the resin sheet 3 provided with the shapes of the protrusions 3a and the grooves 3b is stretched over the roll 9, and the roll 9 is used so that the position Z is an appropriate position.

  A manufacturing method using the resin sheet manufacturing apparatus 1 of the present embodiment will be described.

  In the present embodiment, the resin sheet 3 shown in FIG. 1C is finally obtained. The resin sheet 3 has a plurality of protrusions 3a and a plurality of grooves 3b on one side. In FIG.1 (c), the cross-sectional shape of the resin sheet 3 in the direction orthogonal to the sheet conveyance direction at the time of obtaining the resin sheet 3 is shown. In the melt extrusion method, a long resin sheet 3 is obtained. Therefore, in FIG. 1C, the cross-sectional shape of the resin sheet 3 in the width direction of the long resin sheet 3 is shown.

  The groove 3b is disposed between the two protrusions 3a, and the plurality of protrusions 3a and the plurality of grooves 3b are alternately arranged. The resin sheet 3 has a protrusion 3a on one side so that the length direction of the protrusion 3a and the groove 3b extends in the sheet conveyance direction when obtaining the resin sheet 3, that is, the length direction of the long resin sheet 3. And a groove 3b. The sheet conveying direction when obtaining the resin sheet 3 and the length directions of the protrusions 3a and the grooves 3b are substantially parallel. The length direction of the resin sheet 3 and the length direction of the protrusion 3a and the groove 3b are substantially parallel. The protrusion 3a and the groove 3b are regularly provided along a direction orthogonal to the sheet conveying direction when the resin sheet 3 is obtained. The protrusions 3 a and the grooves 3 b are regularly provided along the width direction of the resin sheet 3. The resin sheet 3 has an uneven shape on one side by the plurality of protrusions 3a and the plurality of grooves 3b. Here, the cross section in the width direction of the protrusion 3a and the cross section in the width direction of the groove 3b are rectangular. The dimension (width dimension) in the cross section of the protrusion 3a in the width direction is W1, and the distance between the centers of the plurality of protrusions 3a, 3a is W2. Moreover, the height of the protrusion 3a is set to h, and the thickness of the resin sheet main body part except the protrusion 3a of the resin sheet 3 is set to t. The thickness t is the thickness of the resin sheet 3 in the groove 3b portion. The resin sheet 3 has a plurality of protrusions 3a having a height h and a width W1 on one side.

  As shown in FIGS. 3A and 3B, in order to obtain the resin sheet 3 by a transfer method, the endless metal strip 6 has a plurality of grooves 6a corresponding to the plurality of protrusions 3a on the outer peripheral surface, and a plurality of A plurality of protrusions 6b corresponding to the grooves 3b. The W1 corresponds to a dimension (width dimension) in a cross section in the width direction of the groove 6a in the endless metal strip 6. W2 corresponds to the distance between the centers of the plurality of grooves 6a, 6a in the endless metal strip 6. The above h corresponds to the depth of the groove 6a.

  When manufacturing the resin sheet 3, the molten resin sheet 3 is extruded from the melt extrusion device 2, and the resin sheet 3 is guided between the roll 11 having the temperature control roll 4 and the pressure roll 7. Specifically, the resin sheet 3 is guided between the endless metal strip 6 located on the outer peripheral surface of the temperature control roll 4 and the pressure-bonding roll 7. The temperature adjusting roll 4 is driven and rotated by the driving device M, and the endless metal strip 6 is rotated and conveyed. Further, the endless metal strip 6 is heated by the electromagnetic induction heating device 8. Thereby, the endless metal strip 6 is heated to a temperature higher than that necessary for good transfer. This temperature also varies depending on the material of the resin sheet 3 and the temperature immediately before the resin sheet 3 supplied between the roll 11 and the pressure roll 7. Heating may be performed at the position X so that the temperature can be satisfactorily transferred.

  The heated endless metal strip 6 moves to the position X as the temperature adjusting roll 4 rotates. At position X, the resin sheet 3 is crimped to the endless metal strip 6 by the crimping roll 7. As a result, the resin sheet 3 is pressed against the outer peripheral surface of the endless metal strip 6. Then, the shape of the groove 6 a and the protrusion 6 b on the outer peripheral surface of the endless metal strip 6 is transferred to one surface of the resin sheet 3, and the shape of the protrusion 3 a and the groove 3 b is imparted to the resin sheet 3. That is, as described above, the transport direction of the endless metal strip 6 on the downstream side of the transport direction of the endless metal strip 6 from the position where the endless metal strip 6 being heated by the electromagnetic induction heating device 8 is heated. In at least a part of the region, the endless metal strip 6 is brought into contact with the temperature control roll 4 through the low relative magnetic permeability layer 5. At the same time, the resin sheet 3 is brought into contact with the outer peripheral surface of the endless metal strip 6 in at least a part of the transport direction of the endless metal strip 6, and the shape of the protrusions 3a and the grooves 3b on one side of the resin sheet 3 Is granted.

  Thereafter, the resin sheet 3 moves from the position X to the position Z in a state where the resin sheet 3 is in contact with the outer peripheral surface of the endless metal strip 6 in a state where the temperature control roll 4 is positioned on the outer peripheral surface. In this case, when a coolant such as water or oil is supplied to the inside of the metal roll main body 4a of the temperature control roll 4, the temperature of the metal roll main body 4a of the temperature control roll 4 increases from the position X to the position Z. descend. Furthermore, the low relative magnetic permeability layer 5 and the endless metal strip 6 are also cooled, and the temperature decreases in the stage from the position X to the position Z. For this reason, at the position Z, the resin sheet 3 can be peeled off from the outer peripheral surface of the endless metal strip 6 without difficulty. Further, the resin sheet 3 peeled from the endless metal strip 6 is taken up via the roll 9.

  According to the resin sheet manufacturing apparatus 1 and the resin sheet manufacturing method using the resin sheet manufacturing apparatus 1 of this embodiment, the endless metal strip 6 is heated by electromagnetic induction heating using the electromagnetic induction heating apparatus 8. Therefore, the endless metal strip 6 can be quickly and efficiently heated above the temperature required for transferring the shape of the fine grooves and protrusions. Furthermore, since the low relative magnetic permeability layer 5 is located inside the endless metal strip 6, an eddy current can be generated more efficiently. Furthermore, since the material with low relative magnetic permeability constituting the low relative magnetic permeability layer 5 has low thermal conductivity, the heat of the endless metal strip 6 is not easily transmitted to the metal roll body 4a side to which the coolant is supplied. Therefore, from the position X to the position Y, the endless metal strip 6 is maintained at a temperature suitable for transfer. Therefore, at the position X, the shape of fine grooves and protrusions can be transferred to the resin sheet 3 with high accuracy.

  Moreover, since the endless metal strip 6 has the grooves 6a and the protrusions 6b on the outer peripheral surface so that the length direction of the grooves 6a and the protrusions 6b extends in the conveying direction of the endless metal strip 6, the fine grooves And the shape of the protrusion can be accurately transferred. Moreover, the stress added to the protrusion 3a provided to the resin sheet 3 at the time of peeling from the outer peripheral surface of the endless metal strip 6 can be reduced. Therefore, the resin sheet 3 can be peeled off from the outer peripheral surface of the endless metal strip 6 at the position Z without breaking the shape of the protrusions and grooves transferred at the position X. It is an electromagnetic induction heating device that endless metal strip 6 has grooves 6a and ridges 6b on the outer peripheral surface so that the length direction of grooves 6a and ridges 6b extends in the conveying direction of endless metal strip 6 In synergy with the above-described effect obtained by providing 8 and the low relative magnetic permeability layer 5, it contributes greatly to the formation of fine protrusions and grooves with high accuracy.

  Further, in the region between the position X and the position Z, when the temperature control roll 4 is cooled by the refrigerant, the temperature of the endless metal strip 6 is appropriately and efficiently lowered. The resin sheet 3 having the fine protrusions 3a and the grooves 3b on one side can be more easily peeled from the outer peripheral surface of the endless metal strip 6.

  In the conventional sheet processing apparatus 101 shown in FIG. 10 described above, it is attempted to increase the temperature of the resin sheet in advance by preheating. However, the heat given by preheating is dissipated before transfer, and the temperature at the time of transfer may not always be an appropriate temperature. Therefore, the sheet processing apparatus 101 shown in FIG. 10 may not be able to transfer a fine uneven shape with high accuracy. On the other hand, according to the present embodiment, as described above, the shapes of the fine grooves and the protrusions can be transferred to the resin sheet 3 with high accuracy. In particular, even when the protrusion 3a having a high aspect ratio h / W1 is formed, the shape can be transferred with high accuracy according to the present embodiment. Specifically, in the above-described conventional sheet processing apparatus, it is extremely difficult to form a protrusion having an aspect ratio of 0.5 or more by a transfer method. The resin sheet 3 which has the protrusion 3a whose h / W1 is 0.5 or more on one side can be obtained. And according to this embodiment, it is also easy to obtain the resin sheet 3 which has the protrusion 3a whose aspect ratio h / W1 is 2 or more on one side.

  When the protrusion 3a having a large aspect ratio as described above is formed on one side, in order to peel the resin sheet 3 from the endless metal strip 6, it is preferable to cool to a certain low temperature. Thereby, the protrusion 3a having a large aspect ratio can be effectively suppressed from being deformed when the resin sheet 3 is peeled off from the outer peripheral surface of the endless metal strip 6 or from being distorted or the like in the resin sheet 3. . In the present embodiment, when the endless metal strip 6 is appropriately cooled during the period from the position X to the position Z, the resin sheet 3 is bonded to the endless metal even when the protrusion 3a having a large aspect ratio is formed. It can peel from the strip | belt body 6 more easily.

  Therefore, the uniformity of the obtained resin sheet 3 can be improved, and the amount of distortion can be reduced. Therefore, for example, the resin sheet 3 can be suitably used as an optical film or sheet.

  FIG. 4 is a partially cutaway sectional view showing a louver sheet 3A as an example of an optical sheet. In the louver sheet 3 </ b> A, the light shielding material layer 3 c is filled in the grooves 3 b between the protrusions 3 a of the resin sheet 3. Since the resin sheet 3 itself is translucent and the light-shielding material layer 3c is light-shielding, as shown by the arrow B in FIG. Have. On the other hand, as indicated by an arrow C in FIG. 4, light does not pass through the light shielding material layer 3 c at an angle inclined with respect to the surface of the resin sheet 3. Therefore, the louver sheet 3A can be used as the viewing angle control sheet.

  In addition to the louver sheet 3A and the prism sheet 15 shown in FIG. 5, the resin sheet obtained by the present invention can be suitably used for an optical sheet having various protrusions and grooves on one side. Examples of such an optical sheet include a lenticular lens sheet, a Fresnel lens sheet, and a microlens array sheet. Moreover, not only the optical sheet but also a resin sheet such as an embossed sheet in which random and fine protrusions and grooves are provided on one side can be provided by the present invention.

  In the first embodiment, in the cross-sectional shape shown in FIG. 1C, the shapes of the plurality of ridges 3a and the grooves 3b that are rectangular are provided. The shape of the formed protrusion and groove is not particularly limited. For example, like a prism sheet 15 shown in FIG. 5, in a cross section in a direction perpendicular to the resin sheet conveyance direction, a triangular protrusion 15a having a width W and a height h and a groove 15b between the protrusions 15a and 15a. The shape may be continuous. Here, the thickness t is the thickness of the sheet main body portion of the resin sheet at a portion where the protrusions 15a are not present, that is, at the deepest portion of the groove 15b. The aspect ratio in this case is defined by h / W, as described above.

(Second Embodiment)
FIG. 6 is a schematic configuration diagram showing a resin sheet manufacturing apparatus according to the second embodiment of the present invention.

  In the resin sheet manufacturing apparatus 21 shown in FIG. 6, the resin sheet 3 extruded from the melt extrusion apparatus 2 is supplied between the temperature control roll 22 and the pressure-bonding roll 7. The melt extrusion device 2 and the pressure roll 7 are configured in the same manner as in the first embodiment. A low relative permeability layer 25 is provided on the outer peripheral surface of the temperature control roll 22. The temperature control roll 22 has a metal roll body 22a. The metal roll body 22a is configured similarly to the metal roll body 4a. The low relative permeability layer 25 is configured in the same manner as the low relative permeability layer 5.

  A second temperature control roll 23 is provided separately from the temperature control roll 22. An endless metal belt 24, which is an endless metal strip, is stretched between the second temperature control roll 23 and the temperature control roll 22. The endless metal belt 24 is formed of the same material as the endless metal strip 6 used in the first embodiment. The endless metal belt 24 is configured separately from the temperature control roll 22 and the low relative permeability layer 25. The endless metal belt 24 has grooves and protrusions on the outer peripheral surface corresponding to the shapes of the protrusions 3 a and the grooves 3 b formed on one surface of the resin sheet 3. The endless metal belt 24 has grooves and protrusions on the outer peripheral surface so that the length direction of the grooves and protrusions extends in the conveying direction of the endless metal belt 24. In addition, in FIG. 6, illustration of the shape of the groove | channel and protrusion of the outer peripheral surface of the endless metal belt 24 was abbreviate | omitted.

  By rotating the second temperature control roll 23, the second temperature control roll 23 rotates in the direction of the arrow D shown in the figure. And the electromagnetic induction heating apparatus 8 is arrange | positioned in the conveyance direction upstream of the endless metal belt 24 rather than the position X, ie, the position where transfer to the resin sheet 3 is performed. Thus, the endless metal strip may be an endless metal belt that is separate from the temperature control roll and the low relative permeability layer. Moreover, the several temperature control rolls 22 and 23 may be used like the manufacturing apparatus 21 of a resin sheet.

  Also in the second embodiment, the roll 9 is disposed in the same manner as in the first embodiment, separated from the temperature control roll 22. The resin sheet 3 is stretched over the roll 9, and the roll 9 is used so that the position Z is an appropriate position.

  Also in the manufacturing method using the resin sheet manufacturing apparatus 21, the endless metal belt 24 is heated at the position Y by the electromagnetic induction heating device 8 until the position X is reached, and the endless metal belt 24 has a temperature higher than a temperature sufficient for transfer. To be heated. Therefore, at the position X, the shape of the groove and the protrusion is reliably transferred to the resin sheet 3. After the transfer, as in the first embodiment, the resin sheet 3 is cooled to an appropriate temperature when moving along the outer peripheral surface of the temperature control roll 22. Therefore, at the position Z, the resin sheet 3 provided with the shapes of fine protrusions and grooves can be peeled without difficulty.

  In the second embodiment, the low relative permeability layer 25 is integrated with the outer peripheral surface of the metal roll body 22a of the temperature control roll 22. The low relative permeability layer 25 is integrally provided on the outer peripheral surface of the temperature control roll 22. The low relative permeability layer 25 may be formed by coating the inner surface of the endless metal belt 24 with a low relative permeability material. In addition, a low relative permeability layer may be provided on both the inner peripheral surface of the endless metal belt 24 and the outer peripheral surface of the temperature control roll 22. In this case, different low relative permeability materials may be used, or the same low relative permeability materials may be used.

  Further, the endless metal belt 24 is separate from the temperature adjusting roll 22 and the low relative magnetic permeability layer 25. For this reason, in order to suppress wear of the inner peripheral surface of the endless metal belt 24 due to friction, position rubbing or cutting of the endless metal belt 24, an inorganic material layer that achieves such an effect may be formed. By forming the inorganic material layer, it is possible to prevent foreign matters from being mixed into the resin sheet.

  The frequency of the high-frequency current used for electromagnetic induction heating is not particularly limited, but is preferably in the range of 10 kHz to 1 MHz. When the frequency is equal to or lower than the upper limit, the relative magnetic permeability of the endless metal strip does not become too low, and heating can be performed more efficiently. When the frequency is equal to or higher than the lower limit, the electromagnetic field is hardly disturbed in the endless metal strip, the magnetic field is hardly leaked to the outside, and more efficient heating can be performed.

  In FIG. 6, an endless metal belt 24 is stretched between the second temperature control roll 23 and the temperature control roll 22. Thus, by arranging a plurality of temperature adjusting rolls inside the endless metal belt 24, the temperature of the endless metal belt 24 can be adjusted more finely. For example, when forming a crystalline thermoplastic resin such as polypropylene into a sheet, the crystallization speed can be easily controlled by using a plurality of temperature control rolls. Therefore, it is possible to provide a resin sheet with higher quality.

  The control temperature of the second temperature control roll 23 may be the same as or different from that of the temperature control roll 22. Moreover, the structure of the 2nd temperature control roll 23 may be the same as that of the temperature control roll 22, and may differ.

  Instead of the second temperature control roll 23, a roll having the same structure as the temperature control roll 22 may be used. When the second temperature control roll 23 and the temperature control roll 22 are the same, adjustment of molding conditions, for example, temperature adjustment can be performed accurately and promptly. In addition, preparation and maintenance of the manufacturing apparatus are easy.

  In addition to the temperature control rolls 22 and 23, a temperature control roll may be provided further downstream of the electromagnetic induction heating device 8 and upstream of the position X. Thereby, the transferability can be further enhanced by relatively increasing the temperature of the upstream temperature control roll.

  When the temperature control rolls 22 and 23 are used, the tension of the endless metal belt 24 can be adjusted by controlling the position of the second temperature control roll 23. Thereby, meandering of the endless metal belt 24 can be prevented, and the degree of heat transfer between the temperature control rolls 22 and 23 can be adjusted.

(Third embodiment)
FIG. 7: is a schematic block diagram which shows the manufacturing apparatus of the resin sheet which concerns on the 3rd Embodiment of this invention.

  In the resin sheet manufacturing apparatus 31 shown in FIG. 7, a roll 11 having a temperature control roll 4 configured in the same manner as in the first embodiment is used. The difference from the first embodiment is that edge pinning is performed at the portion where the resin sheet 3 extruded from the melt extrusion device 2 is in contact with the outer peripheral surface of the endless metal strip 6 provided on the outer peripheral surface of the temperature control roll 4. That is, the resin sheet 3 is brought into close contact with the outer peripheral surface of the endless metal strip 6 by the device 32. A known edge pinning device can be used as the edge pinning device 32. By using the edge pinning device 32, a resin sheet having a small residual phase difference, a small flare, and an excellent thickness accuracy can be obtained.

  Also in the third embodiment, since the endless metal strip 6 is preheated to an appropriate temperature for transfer by the electromagnetic induction heating device 8, the resin sheet 3 is formed into an endless metal strip by the edge pinning device 32 which is a shape imparting device. When brought into close contact with the body 6, the shapes of the fine grooves and the protrusions can be transferred with high accuracy. When the edge pinning device 32 is used, the press roll 7 in the first embodiment can be omitted.

  In addition to the edge pinning device, a die roll method in which a resin sheet extruded from a die lip is directly pressed against an endless metal strip as a shape imparting device for imparting the shape of a protrusion and a groove to one surface of the resin sheet 3 Alternatively, an air knife method using an air knife may be used. As a device using a die roll method or an air knife method, a known device can be appropriately used.

  As a modification of the first embodiment, as shown in FIG. 8, the endless metal strip 6 is formed of an endless metal belt 24 </ b> A that is separate from the temperature control roll 4 and the low relative permeability layer 5. May be. That is, in the present invention, the endless metal strip does not necessarily have to be integrated with the temperature control roll and the low relative permeability layer.

  Hereinafter, specific examples and comparative examples of the present invention will be given to clarify the effects of the present invention.

Example 1
The resin sheet manufacturing apparatus 1 of the first embodiment was used. An endless metal strip 6 having grooves 6a and ridges 6b on the outer peripheral surface so that the length directions of the grooves 6a and ridges 6b extend in the transport direction (rotation direction, circumferential direction) of the endless metal strip 6 Using.

  A long resin sheet 3 shown in FIG. 1C was obtained. FIG. 1C shows a cross section of the resin sheet 3 in the direction orthogonal to the sheet conveying direction when the resin sheet 3 is obtained and in the width direction of the resin sheet 3. W1, W2, h, and t of the resin sheet 3 shown in FIG. 1 (c) were W1 = 10 μm, W2 = 60 μm, h = 110 μm, and t = 200 μm, respectively.

  As a thermoplastic resin for constituting the resin sheet 3, Asahi Kasei Co., Ltd., acrylic resin, trade name: Delpet was used. The conditions were set so that the surface temperature of the endless metal strip was 170 ° C. at position X.

(Example 2)
Resin sheet 3 in the same manner as in Example 1 except that the shapes of the grooves 6a and the ridges 6b of the endless metal strip 6 are changed and the shapes of the ridges 3a and the grooves 3b of the resin sheet 3 are changed. Got. The aspect ratio h / W1 of the groove 6a was 2.2.

  W1, W2, h, and t of the resin sheet 3 shown in FIG. 1 (c) were W1 = 50 μm, W2 = 100 μm, h = 110 μm, and t = 200 μm, respectively.

(Example 3)
Resin sheet 3 in the same manner as in Example 1 except that the shapes of the grooves 6a and the ridges 6b of the endless metal strip 6 are changed and the shapes of the ridges 3a and the grooves 3b of the resin sheet 3 are changed. Got. The aspect ratio h / W1 of the groove 6a was 2.5.

  W1, W2, h, and t of the resin sheet 3 shown in FIG. 1 (c) were W1 = 20 μm, W2 = 70 μm, h = 125 μm, and t = 300 μm, respectively.

(Comparative Example 1)
An attempt was made to produce a resin sheet similar to that of Example 1 using the conventional sheet processing apparatus 101 shown in FIG. As the temperature at the position where the transfer is performed becomes higher, the resin sheet peels off from the roll, so the roll temperature at the transfer position is 130 ° C., which is a moldable temperature.

(Comparative Example 2)
An attempt was made to produce the same resin sheet as in Example 2 using the conventional sheet processing apparatus 101 shown in FIG. As the temperature at the position where the transfer is performed becomes higher, the resin sheet peels off from the roll, so the roll temperature at the transfer position is 130 ° C., which is a moldable temperature.

(Reference Example 1)
An attempt was made to obtain the resin sheet 111 shown in FIG. 9 in the same manner as in Example 1 except that only the endless metal strip was changed by changing the formation direction of the protrusions and grooves of the endless metal strip. An endless metal strip having a groove and a ridge on the outer peripheral surface was used so that the length direction of the groove and the ridge extends in a direction orthogonal to the conveying direction of the endless metal strip. The aspect ratio h / W1 of the groove of the endless metal strip was 2.2.

  FIG. 9 shows a cross section of the resin sheet 111 in the sheet conveyance direction and the length direction of the resin sheet 111 when the resin sheet 111 is obtained. W1, W2, h, and t of the resin sheet 111 shown in FIG. 9 were W1 = 10 μm, W2 = 60 μm, h = 110 μm, and t = 200 μm, respectively.

(Reference Example 2)
An attempt was made to obtain the resin sheet 111 shown in FIG. 9 in the same manner as in Example 2 except that only the endless metal strip was changed by changing the formation direction of the protrusions and grooves of the endless metal strip. An endless metal strip having a groove and a ridge on the outer peripheral surface was used so that the length direction of the groove and the ridge extends in a direction orthogonal to the conveying direction of the endless metal strip. The aspect ratio h / W1 of the groove of the endless metal strip was 2.2.

  W1, W2, h, and t of the resin sheet 111 shown in FIG. 9 were W1 = 50 μm, W2 = 100 μm, h = 110 μm, and t = 200 μm, respectively.

(Evaluation)
The transferability between the grooves and the protrusions in each resin sheet (thermoplastic resin sheet) obtained in Examples 1 to 3, Comparative Examples 1 to 2, and Reference Examples 1 to 2 was evaluated.

  The protrusions and groove forming portions of the resin sheet were cut in a direction perpendicular to the sheet surface direction, and photographed with a microscope, and the transfer rate was determined.

  In addition, it was evaluated whether or not the ridges were torn, whether or not vertical stripes were seen on the ridges, and whether or not there was an extension of the ridge height. If the ridge is broken and there is no vertical line or height extension, “○”, and if the ridge is broken and either the vertical line or height extension is slightly “△”, the line is The shape of the ridge was determined as “x” when any of tearing, vertical streak, and height extension was significant. The results are shown in Table 1 below.

  The transfer rate in Table 1 means the ratio of the heights of the grooves and ridges formed on the endless metal strip and the ridges and grooves transferred to the thermoplastic resin sheet. In other words, the ratio of the height of the protrusions of the endless metal strip to the height h shown in FIG.

  In Examples 1 to 3, the shape of the grooves and protrusions of the endless metal strip was completely transferred to one surface of the resin sheet 3. On the other hand, in Comparative Examples 1 and 2, the shape of the protrusion was poor, and in Comparative Example 2, the transfer rate was as low as 15%.

DESCRIPTION OF SYMBOLS 1 ... Resin sheet manufacturing apparatus 2 ... Melt extrusion apparatus 3 ... Resin sheet 3A ... Louver sheet 3a ... Projection 3b ... Groove 3c ... Light-shielding material layer 4 ... Temperature control roll 4a ... Metal roll main body 4b ... Hollow part 5 ... Low Relative magnetic permeability layer 6 ... Endless metal strip 6a ... Groove 6b ... Projection 7 ... Crimp roll 8 ... Electromagnetic induction heating device 9 ... Roll 11 ... Roll 15 ... Prism sheet 15a ... Projection 15b ... Groove 21 ... Production of resin sheet Device 22 ... Temperature control roll 22a ... Metal roll body 23 ... Second temperature control roll 24 ... Endless metal belt 24A ... Endless metal belt 25 ... Low relative permeability layer 31 ... Resin sheet manufacturing device 32 ... Edge pinning device

Claims (11)

An apparatus for producing a resin sheet having a plurality of protrusions and grooves between the protrusions on one side,
A temperature control roll having a metal roll body;
An endless metal strip having grooves and ridges corresponding to the shapes of the ridges and the grooves formed on one surface of the resin sheet; and
A low relative permeability layer that is provided on at least one of the outer peripheral surface of the temperature control roll and the inner peripheral surface of the endless metal strip, and has a lower relative permeability than the endless metal strip,
A resin sheet is brought into contact with the outer circumferential surface of the endless metal strip while the endless metal strip rotates while the endless metal strip is in contact with the temperature control roll through the low relative permeability layer. A shape imparting device for imparting the shape of the protrusion and the groove to one side of the resin sheet,
An electromagnetic induction heating device for heating the endless metal strip on the upstream side of the position where the resin sheet is in contact with the outer peripheral surface of the endless metal strip,
The endless metal strip is an endless metal belt;
The temperature control roll has a plurality of temperature control rolls;
The endless metal belt is passed over a plurality of temperature control rolls;
The apparatus for producing a resin sheet, wherein the endless metal strip has the groove and the protrusion on an outer peripheral surface so that a length direction of the groove and the protrusion extends in a conveying direction of the endless metal strip.   The apparatus for producing a resin sheet according to claim 1, wherein the low relative magnetic permeability layer is integrally provided on an outer peripheral surface of the metal roll body of the temperature control roll.   The low relative permeability layer is integrally provided on the outer peripheral surface of the metal roll main body of the temperature control roll, and the endless metal strip is integrally provided on the outer peripheral surface of the low relative permeability layer. The apparatus for producing a resin sheet according to claim 2. The shape imparting device is a crimping roll for crimping a resin sheet to the outer peripheral surface of the endless metal strip,
The pressure-bonding roll is disposed so as to have a gap with the temperature control roll, and the resin sheet is pressure-bonded to the outer peripheral surface of the endless metal strip in the gap by the pressure-bonding roll. apparatus for producing a resin sheet according to any one of 1 to 3. The shaping device is an edge pinning device manufacturing apparatus of the resin sheet according to any one of claims 1-3. The resin sheet manufacturing apparatus according to any one of claims 1 to 3 , wherein the shape imparting apparatus is an air knife. A melt extrusion device for extruding the molten resin into a sheet;
The manufacturing apparatus of the resin sheet of any one of Claims 1-6 which provides the shape of the said protrusion and the said groove | channel to the single side | surface of the resin sheet extruded by this melt extrusion apparatus. The resin sheet according to any one of claims 1 to 7 , wherein the temperature control roll has a hollow portion inside the metal roll main body and a refrigerant supply device for supplying a refrigerant to the hollow portion. Manufacturing equipment. Wherein in said groove of the outer peripheral surface of the endless metal strip, the aspect ratio of the width direction of the cross section of the groove in the direction perpendicular to the conveying direction of the endless metal strip is 0.5 or more, of claims 1-8 The manufacturing apparatus of the resin sheet of any one of Claims. 10. The resin sheet according to claim 9 , wherein in the groove on the outer peripheral surface of the endless metal strip, the aspect ratio of the cross section in the width direction of the groove in a direction orthogonal to the conveying direction of the endless metal strip is 2 or more. Manufacturing equipment. A method for producing a resin sheet having a plurality of ridges and grooves between the ridges on one side using the resin sheet production apparatus according to any one of claims 1 to 10 ,
Rotating the temperature control roll to convey the endless metal strip; and
Heating the endless metal strip with the electromagnetic induction heating device;
In at least a part of the transport direction of the endless metal strip, on the downstream side of the transport direction of the endless metal strip from the position where the endless metal strip is heated by the electromagnetic induction heating device The endless metal strip is brought into contact with the temperature adjusting roll through the low relative permeability layer, and at least part of the region in the transport direction of the endless metal strip on the outer peripheral surface of the endless metal strip. A step of bringing a resin sheet into contact with each other and imparting the shape of the protrusion and the groove to one surface of the resin sheet;
A method for producing a resin sheet, comprising: a step of peeling a resin sheet provided with shapes of the ridges and the grooves from an outer peripheral surface of the endless metal strip.

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