JP2012121142A - Method for manufacturing extruded resin plate - Google Patents

Abstract

An object of the present invention is to provide a method for producing an extruded resin plate having excellent heat warping resistance.
A melted thermoplastic resin 3 is extruded from a die 2, sandwiched between a first cooling roll 5 and a second cooling roll 6, wound around a second cooling roll 6, and then placed on a third cooling roll 7. A method for producing an extruded resin plate by cooling by winding, wherein the first cooling roll 5 and the third cooling roll 7 are both elastic rolls having a metal thin film on the outer periphery, and the second cooling The roll 6 was a metal roll, and the peripheral speed ratio (V3 / V2) between the peripheral speed (V2) of the second cooling roll 6 and the peripheral speed (V3) of the third cooling roll 7 was set to less than 1. . It is preferable that the thermoplastic resin is a methacrylic resin or an aromatic polycarbonate resin.
[Selection] Figure 1

Description

  The present invention relates to a method for producing an extruded resin plate by extruding a thermoplastic resin.

  As a method for producing an extruded resin plate, a molten thermoplastic resin is extruded from a die, sandwiched between a first cooling roll and a second cooling roll, wound around a second cooling roll, and then wound around a third cooling roll. There is a method of cooling to obtain an extruded resin plate (for example, see Patent Documents 1 and 2). In Patent Documents 1 and 2, the peripheral speed of each cooling roll is controlled to a predetermined value, and the retardation and shrinkage in the thickness direction of the resulting extruded resin plate are lowered.

  On the other hand, the extruded resin plate obtained by the above-described extrusion molding method has a problem that it is easily warped when heated. This problem is conspicuous in optical applications such as a display protection plate where the usage environment is likely to become hot due to heat generated from the light source.

  However, Patent Documents 1 and 2 do not discuss suppression of heating warpage. Therefore, the extruded resin plate obtained by the conventional extrusion molding method as described in Patent Documents 1 and 2 has not been sufficiently resistant to heat warpage.

JP 2009-154442 A JP 2007-185756 A

  The subject of this invention is providing the manufacturing method of the extrusion resin board which is excellent in heat-warping-proof property.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found a solution means having the following constitution and have completed the present invention.
(1) The molten thermoplastic resin is extruded from a die, sandwiched between a first cooling roll and a second cooling roll, wound around a second cooling roll, and then cooled by winding around a third cooling roll. , A method for producing an extruded resin plate, wherein each of the first cooling roll and the third cooling roll is an elastic roll having a metal thin film on an outer peripheral portion, and the second cooling roll is a metal roll. The extruded resin is characterized in that the peripheral speed ratio (V3 / V2) between the peripheral speed (V2) of the second cooling roll and the peripheral speed (V3) of the third cooling roll is less than 1. A manufacturing method of a board.
(2) The method for producing an extruded resin plate according to (1), wherein the thermoplastic resin is a methacrylic resin or an aromatic polycarbonate resin.
(3) Among the elastic rolls constituting the first cooling roll and the third cooling roll, at least one of the elastic rolls is a substantially cylindrical shaft roll and a cylinder disposed so as to cover the outer peripheral surface of the shaft roll. (1) or (1), wherein a metal thin film having a shape and a fluid sealed between the shaft roll and the metal thin film are provided, and the temperature of the fluid is controlled by temperature control. The manufacturing method of the extrusion resin board as described in (2).

  Since the extruded resin plate of the present invention is hardly warped even when heated, it can be suitably used for optical applications such as a display protection plate where the use environment tends to become high temperature.

It is a schematic explanatory drawing which shows the manufacturing method of the extrusion resin board concerning one Embodiment of this invention. It is a partial expansion schematic explanatory drawing of FIG.

  The extruded resin plate of the present invention is made of a thermoplastic resin. The thermoplastic resin may be a general-purpose thermoplastic resin or an engineering plastic, such as a methacrylic resin, a styrene resin, a methyl methacrylate-styrene resin, or a methyl methacrylate-butadiene-styrene. Resin, polyvinyl chloride resin, polyethylene resin such as low density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene resin, acrylonitrile-butadiene-styrene resin, acrylonitrile-styrene resin, cellulose acetate resin, ethylene-vinyl acetate resin , Acrylic-chlorinated polyethylene resin, ethylene vinyl alcohol resin, fluorine resin, polyacetal resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, aromatic Recarbonate resin, polysulfone resin, polyethersulfone resin, methylpentene resin, polyarylate resin, resin containing alicyclic structure-containing ethylenically unsaturated monomer unit, polyphenylene sulfide resin, polyphenylene oxide resin, polyether ether ketone resin , Polyvinyl chloride elastomer, chlorinated polyethylene, ethylene-ethyl acrylate resin, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, ionomer resin, styrene / butadiene block polymer, ethylene-propylene rubber, polybutadiene resin, acrylic elastomer, etc. Can be mentioned.

  Among these, methacrylic resins or aromatic polycarbonate resins are preferred because of their good optical properties. As the methacrylic resin, for example, those having a methyl methacrylate unit as a main component, specifically, a methyl methacrylate resin containing usually 50% by mass or more and preferably 70% by mass or more of a methyl methacrylate unit are preferably used. Examples of the methyl methacrylate resin include a methyl methacrylate homopolymer having a methyl methacrylate unit of 100% by mass, and a copolymer with methyl methacrylate and other monomers copolymerizable therewith.

  Other monomers that can be copolymerized with methyl methacrylate include methacrylic acid esters other than methyl methacrylate, and specific examples thereof include ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, and phenyl methacrylate. , Benzyl methacrylate, 2-ethylhexyl methacrylate, 2-hydroxyethyl methacrylate and the like.

  Examples of other monomers include acrylate esters, and specific examples thereof include methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, and acrylic acid. Examples include 2-ethylhexyl and 2-hydroxyethyl acrylate.

  Furthermore, other monomers include unsaturated acids such as methacrylic acid and acrylic acid, unsubstituted styrene, halogenated styrenes such as chlorostyrene and bromostyrene, and alkylstyrenes such as vinyltoluene and α-methylstyrene. Substituted styrenes such as acrylonitrile, acrylonitrile, methacrylonitrile, maleic anhydride, phenylmaleimide, cyclohexylmaleimide and the like. The other monomers which can be copolymerized with these exemplified methyl methacrylates may be used alone or in combination of two or more.

  On the other hand, examples of the aromatic polycarbonate resin include those obtained by polymerizing a dihydric phenol and a carbonylating agent by an interfacial polycondensation method or a melt transesterification method, or by polymerizing a carbonate prepolymer by a solid phase transesterification method. And those obtained by polymerizing by a ring-opening polymerization method of a cyclic carbonate compound.

  Examples of the dihydric phenol include hydroquinone, resorcinol, 4,4′-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, bis {(4-hydroxy-3,5-dimethyl) phenyl} methane, 1,1-bis. (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 2,2-bis (4-hydroxyphenyl) propane (commonly called bisphenol A), 2,2-bis {( 4-hydroxy-3-methyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dimethyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dibromo) Phenyl} propane, 2,2-bis {(3-isopropyl-4-hydroxy) phenyl} propane, 2,2-bis {(4- Droxy-3-phenyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) -4 -Methylpentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3 5-trimethylcyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis {(4-hydroxy- -Methyl) phenyl} fluorene, α, α'-bis (4-hydroxyphenyl) -o-diisopropylbenzene, α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene, α, α'-bis ( 4-hydroxyphenyl) -p-diisopropylbenzene, 1,3-bis (4-hydroxyphenyl) -5,7-dimethyladamantane, 4,4′-dihydroxydiphenylsulfone, 4,4′-dihydroxydiphenylsulfoxide, 4, Examples include 4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenyl ketone, 4,4′-dihydroxydiphenyl ether, and 4,4′-dihydroxydiphenyl ester. These may be used alone or in combination of two or more. May be used in combination.

  Among them, bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3 -Methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl) −3,3,5-trimethylcyclohexane and α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene are preferred. In particular, bisphenol A alone or 1,1-bis (4-hydroxyphenyl)- 3,3,5-trimethylcyclohexane and bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propa And at least one selected from α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene are preferred.

  Examples of the carbonylating agent include carbonyl halides such as phosgene, carbonate esters such as diphenyl carbonate, and haloformates such as dihaloformate.

  The thermoplastic resin may contain a rubbery polymer. The rubbery polymer is preferably one having a refractive index substantially equal to that of the thermoplastic resin other than the rubbery polymer, that is, having a refractive index difference of 0.005 or less.

  Acrylic rubber particles are suitable as the rubbery polymer when the portion other than the rubbery polymer of the thermoplastic resin is a methacrylic resin. The acrylic rubber particle is a particle containing an elastic polymer mainly composed of an acrylate ester as a rubber component, and may be a particle having a single layer structure made of only this elastic polymer, or a layer of this elastic polymer. It may be a multi-layered particle having The elastic polymer may be a homopolymer of an acrylate ester or a copolymer of 50% by mass or more of an acrylate ester and 50% by mass or less of other monomers. .

  The thermoplastic resin can be produced, for example, by a bulk polymerization method, a suspension polymerization method, a micro suspension polymerization method, an emulsion polymerization method, a dispersion polymerization method, or the like. The thermoplastic resin contains, for example, a light diffusing agent, an ultraviolet absorber, a surfactant, an impact resistance agent, a polymer antistatic agent, an antioxidant, a flame retardant, a lubricant, a colorant such as a dye or a pigment, and the like. Also good.

  The extruded resin plate of the present invention comprising the thermoplastic resin described above can be produced by an extrusion molding method. Hereinafter, an embodiment of a method for producing an extruded resin plate according to the present invention will be described in detail with reference to FIGS. 1 and 2.

  As shown in FIG. 1, first, the above-described thermoplastic resin is melt-kneaded by an extruder 1, and a molten thermoplastic resin (hereinafter referred to as “molten thermoplastic resin”) 3 is formed from a die 2 into a plate shape. Extrude. Examples of the extruder 1 include a single screw extruder and a twin screw extruder. Examples of the die 2 include a T die.

  The molten thermoplastic resin 3 extruded from the die 2 is molded and cooled by the cooling unit 4. The cooling unit 4 is constituted by three cooling rolls arranged to face each other in a substantially horizontal direction. The three cooling rolls include a first cooling roll 5, a second cooling roll 6, and a third cooling roll 7 that are arranged in order along the direction of taking the molten thermoplastic resin 3 indicated by the arrow A.

  As shown in FIG. 2, the molding / cooling by the cooling unit 4 is performed by sandwiching the molten thermoplastic resin 3 between the first cooling roll 5 and the second cooling roll 6 and winding it around the second cooling roll 6. It is carried out by winding around the third cooling roll 7. More specifically, the molten thermoplastic resin 3 is sandwiched between the first cooling roll 5 and the second cooling roll 6, and the second cooling roll 6 and the third cooling roll 7 are wound around the second cooling roll 6. And is cooled by being wound around the third cooling roll 7 and then taken up by a take-up roll (not shown) to obtain an extruded resin plate 10.

  Here, of the first to third cooling rolls 5 to 7, at least the second and third cooling rolls 6 and 7 are connected to a rotation driving means such as a motor, and the second and third cooling rolls 6 and 7 are predetermined. It is configured to rotate independently at the peripheral speed. Then, the peripheral speed ratio (V3 / V2) between the peripheral speed (V2) of the second cooling roll 6 and the peripheral speed (V3) of the third cooling roll 7 is made less than 1, preferably 0.999 or less. Thereby, the heat-proof curvature property of the extrusion resin board 10 obtained can be improved. The reason for this is presumed as follows.

  That is, in the process of molding and cooling the molten thermoplastic resin 3 by the cooling unit 4, internal stress is generally easily accumulated. If the molten thermoplastic resin 3 is molded and cooled in a state where the peripheral speed ratio (V3 / V2) is less than 1, that is, the third cooling roll 7 is rotated slower than the second cooling roll 6, the internal stress is not easily accumulated. As a result, it is assumed that the obtained extruded resin plate 10 is hardly warped even when heated.

  On the other hand, when the peripheral speed ratio (V3 / V2) is 1 or more, that is, when the third cooling roll 7 is rotated at the same speed as or faster than the second cooling roll 6, the heat warping resistance of the extruded resin plate 10 is improved. Can not.

  The lower limit value of the peripheral speed ratio (V3 / V2) is not particularly limited as long as the molten thermoplastic resin 3 can be taken and exhibits the effects of the present invention, but is usually 0.900 or more, 0 Is preferably 950 or more, more preferably 0.990 or more, and even more preferably 0.995 or more.

  The peripheral speeds (V1), (V2), and (V3) of the first, second, and third cooling rolls 5, 6, and 7 are usually 0.5 to 6 m / second, and 1 to 5 m / second. It is preferable to be 2 to 4 m / sec, and it is preferable to set the peripheral speed ratio (V3 / V2) to less than 1 within this numerical range.

  In the present embodiment, in addition to controlling the peripheral speed ratio (V3 / V2) to the specific value described above, the first to third cooling rolls 5 to 7 are further configured by specific cooling rolls. Specifically, among the first to third cooling rolls 5 to 7, the first cooling roll 5 is an elastic roll having a metal thin film on the outer periphery, and the second cooling roll 6 is a rigid metal roll. To do. Thus, when the molten thermoplastic resin 3 is sandwiched between the first and second cooling rolls 5 and 6, the first cooling roll 5 that is an elastic roll is a second cooling that is a metal roll through the molten thermoplastic resin 3. The roller 6 is elastically deformed into a concave shape along the outer peripheral surface of the roll 6. As a result, the first and second cooling rolls 5 and 6 are brought into pressure contact with the molten thermoplastic resin 3 by surface contact, and the molten thermoplastic resin 3 sandwiched between these rolls is uniformly applied in a planar shape. The film is formed while being pressed.

  In this embodiment, the 3rd cooling roll 7 is made into the elastic roll provided with the metal thin film in the outer peripheral part. Therefore, the same effect as that between the first and second cooling rolls 5 and 6 can be obtained between the second and third cooling rolls 6 and 7, and therefore distortion during the film formation of the molten thermoplastic resin 3 is reduced. Thus, an extruded resin plate 10 having reduced strength and anisotropy of heat shrinkage is obtained. Therefore, according to this embodiment, the effect by controlling the peripheral speed ratio (V3 / V2) to the specific value described above, and the first to third cooling rolls 5 to 7 are configured by specific cooling rolls. Combined with the effect, the extruded resin plate 10 having excellent heat warping resistance can be obtained.

  As said metal roll which comprises the 2nd cooling roll 6, what is conventionally used by extrusion molding is employable, For example, a drilled roll, a spiral roll, etc. are mentioned.

  As the elastic rolls constituting the first and third cooling rolls 5 and 7, for example, a substantially cylindrical shaft roll, a cylindrical metal thin film arranged so as to cover the outer peripheral surface of the shaft roll, An elastic roll (A) comprising a fluid made of water, oil, or the like enclosed between a shaft roll and a metal thin film, and configured to be temperature-controllable by controlling the temperature of the fluid; The elastic roll (B) etc. which wound the metal thin film around the outer peripheral surface of this rubber roll are mentioned.

  The metal thin film in the elastic rolls (A) and (B) is made of, for example, stainless steel, and the thickness is preferably about 0.2 to 3 mm. Moreover, it is preferable that at least one of the elastic rolls constituting the first and third cooling rolls 5 and 7 is an elastic roll (A).

  The thickness of the obtained extruded resin plate 10 is preferably 0.3 to 5 mm, more preferably 0.4 to 3 mm, and even more preferably 0.5 to 2 mm. The thickness of the extruded resin plate 10 can be adjusted, for example, by adjusting the thickness of the molten thermoplastic resin 3 extruded from the die 2 and the interval between the first cooling roll 5 and the second cooling roll 6. . Further, the obtained extruded resin plate 10 may be formed with a cured film on the surface or subjected to an antireflection treatment as necessary.

  The extruded resin plate of the present embodiment thus obtained is excellent in heat warping resistance, and therefore can be used for various applications. Among them, it is preferably used as a liquid crystal display protective plate. Applications of liquid crystal displays include, for example, display windows of portable information terminals such as TVs and computer monitors, mobile phones, personal handy-phone systems (PHS), and PDAs (Personal Digital Assistants), digital cameras, and handheld video cameras. Examples include a finder section and a display window of a portable game machine.

  In order to produce a display protective plate from the extruded resin plate of this embodiment, first, if necessary, the extruded resin plate is subjected to processing such as printing and drilling, and then the extruded resin plate is cut to a required size. Good. Thereafter, if the extruded resin plate is set on the display, it can be suitably used as a display protective plate.

  As mentioned above, although preferable embodiment concerning this invention was described, this invention is not limited to the above embodiment, A various improvement and change are possible within the range described in the claim.

  For example, in the above-described embodiment, the number of cooling rolls is three, but may be four or more. That is, a plurality of cooling rolls may be added after the third cooling roll. The number of cooling rolls to be added is usually about 2 to 4 appropriately. The cooling roll to be added may be constituted by one kind selected from a metal roll and an elastic roll, or may be constituted by combining a metal roll and an elastic roll.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, this invention is not limited to a following example.

The structure of the extrusion apparatus used in the following examples and comparative examples is as follows.
Extruder 1: A single screw extruder (manufactured by Hitachi Zosen Corporation) having a screw diameter of 130 mm was used.
Die 2: A T-die (manufactured by Hitachi Zosen Corporation) having a lip width of 1650 mm and a lip interval of 1 mm was used.
Cooling unit 4: A horizontal type, a surface length of 1800 mm, and first to third cooling rolls 5 to 7 having a diameter of 350 mm were used. These 1st-3rd cooling rolls 5-7 were connected to the motor, and it comprised so that each might rotate independently at predetermined | prescribed peripheral speed. The configurations of the first to third cooling rolls 5 to 7 other than those described above are as follows.

First and third cooling rolls 5, 7: Elastic rolls described later were used.
Second cooling roll 6: A stainless steel spiral roll was used.

  The elastic roll used in the first and third cooling rolls 5 and 7 is an elastic roll in which a metal thin film is disposed so as to cover the outer peripheral surface of the shaft roll, and a fluid is sealed between the shaft roll and the metal thin film. Using. The shaft roll, metal thin film and fluid are as follows.

Axial roll: stainless steel one was used.
Metal thin film: A 2 mm thick stainless steel mirror metal sleeve was used.
Fluid: Oil was used. The temperature of this oil was controlled so that the temperature of the elastic roll could be controlled. More specifically, the oil was heated and cooled by ON / OFF control of a temperature controller so that the temperature could be controlled and circulated between the shaft roll and the metal thin film.

  A methacrylic resin was used as the thermoplastic resin used in the following examples and comparative examples. As the methacrylic resin, pellets of thermoplastic polymer having a heat distortion temperature of 100 ° C. obtained by bulk polymerization of a monomer composed of 94% by mass of methyl methacrylate and 6% by mass of methyl acrylate were used.

[Example 1 and Comparative Examples 1 and 2]
<Production of extruded resin plate>
First, the extruder 1, the die 2, and the first to third cooling rolls 5 to 7 were disposed as shown in FIGS. 1 and 2, and the feed block was disposed at a predetermined position. Next, the second and third cooling rolls 6 and 7 were rotated at the peripheral speeds (V2) and (V3) shown in Table 1. In addition, the peripheral speed (V1) of the 1st cooling roll 5 was set to 2.695 m / sec. Moreover, as a result of adjusting and measuring the surface temperature of the 1st-3rd cooling rolls 5-7 to predetermined temperature, the surface temperature of the 1st cooling roll 5 is 98 degreeC, the surface temperature of the 2nd cooling roll 6 is 97 degreeC, The surface temperature of the 3rd cooling roll 7 was 97 degreeC.

  Next, the methacrylic resin pellets were melt-kneaded in the extruder 1 and fed in the order of the feed block and the die 2. Then, the methacrylic resin extruded from the die 2 in the molten state is sandwiched between the first cooling roll 5 and the second cooling roll 6 and wound around the second cooling roll 6 while the second cooling roll 6 and the third cooling roll. It was sandwiched between the rolls 7 and wound around the third cooling roll 7 to be cooled to obtain an extruded resin plate having a thickness of 1.0 mm.

<Evaluation>
The obtained extruded resin plates (Example 1 and Comparative Examples 1 and 2) were evaluated for heating warpage. The evaluation method is shown below, and the results are shown in Table 1.

(Evaluation method for heating warpage)
First, a test piece was cut out from the extruded resin plate. The shape of the test piece was 85 mm in the extrusion direction and 55 mm in the direction orthogonal to the extrusion direction. The test piece was placed on a surface plate with the convex warped surface facing downward, and the amount of lift at the four corners was measured with a position sensor, and the average value of the measured values was taken as the initial warpage amount.

  Next, the test piece was placed in a thermo-hygrostat set at a temperature of 85 ° C. and a humidity of 50% in a state where the test piece was suspended so that the extrusion direction was vertical, and held for 1 hour. Thereafter, the amount of lifting at the four corners of the test piece was measured in the same manner as the initial warpage amount, and the heating warpage amount was obtained. The initial warpage amount and the heating warpage amount were applied to the formula: heating warpage amount−initial warpage amount, and the warpage shift amount was calculated.

  As is apparent from Table 1, the first embodiment in which the circumferential speed ratio (V3 / V2) is less than 1 has a warp displacement amount as compared with Comparative Examples 1 and 2 in which the circumferential speed ratio (V3 / V2) is 1 or more. Small results were shown. From this result, it can be seen that Example 1 is hardly warped even when heated, and has excellent heat warping resistance.

DESCRIPTION OF SYMBOLS 1 Extruder 2 Die 3 Molten thermoplastic resin 4 Cooling unit 5 1st cooling roll 6 2nd cooling roll 7 3rd cooling roll 10 Extrusion resin board

Claims (3)

The molten thermoplastic resin is extruded from the die, sandwiched between the first cooling roll and the second cooling roll, wound around the second cooling roll, and then cooled by winding around the third cooling roll to obtain an extruded resin. A method of manufacturing a plate,
The first cooling roll and the third cooling roll are both elastic rolls provided with a metal thin film on the outer periphery, and the second cooling roll is a metal roll,
Production of an extruded resin plate, wherein a circumferential speed ratio (V3 / V2) between a circumferential speed (V2) of the second cooling roll and a circumferential speed (V3) of the third cooling roll is less than 1. Method.   The method for producing an extruded resin plate according to claim 1, wherein the thermoplastic resin is a methacrylic resin or an aromatic polycarbonate resin.   Among the elastic rolls constituting the first cooling roll and the third cooling roll, at least one of the elastic rolls is a substantially cylindrical shaft roll and a cylindrical metal disposed so as to cover the outer peripheral surface of the shaft roll. 3. The apparatus according to claim 1, further comprising a thin film, and a fluid sealed between the shaft roll and the metal thin film, and further configured to be temperature-controllable by controlling the temperature of the fluid. A method for producing an extruded resin plate.

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