Heating roller

Abstract

To provide a heating roller that can heat uniformly along its entire length. [Solution] The present invention provides a heating roller comprising a cylindrical body and an infrared radiation source located inside the cylindrical body and extending in the longitudinal direction of the cylindrical body, wherein the outer surface of the cylindrical body has a right-side overlapping outer region including a right-side overlapping outer region that overlaps with the vicinity of the right-side end of the projected image obtained by projecting the infrared radiation source working part onto the outer surface of the cylindrical body, a left-side overlapping outer region including a left-side overlapping outer region that overlaps with the vicinity of the left-side end of the projected image obtained by projecting the infrared radiation source working part onto the outer surface of the cylindrical body, and a central outer region between the right-side overlapping outer region and the left-side overlapping outer region, and the right-side overlapping outer region and the left-side overlapping outer region of the outer surface of the cylindrical body have an insulating layer or a heat-shielding layer.

Description

[Technical Field] 【0001】 The present invention relates to a heating roller, and more particularly to a heating roller capable of uniformly heating sheet-like heat-treated materials such as fiber sheets. In particular, it relates to a heating roller capable of uniformly performing heat treatment at high temperatures of 350°C or higher. [Background technology] 【0002】 One known method for manufacturing fibrous sheets, such as nonwoven fabrics, is solution spinning, in which a polymer solution obtained by dissolving a polymer in a solvent is spun to form fibers, which are then collected to form a nonwoven fabric. However, because this solution spinning method uses a polymer solution obtained by dissolving a polymer in a solvent, solvent residue may remain in the constituent fibers of the formed nonwoven fabric. Such solvent residue can have adverse effects when the nonwoven fabric is applied to various uses. Therefore, it was necessary to thoroughly heat the material to remove the solvent and prevent residue from remaining. 【0003】 For example, if a nonwoven fabric containing residual solvent was used as a separator for an electrochemical element, the solvent remaining in the nonwoven fabric's constituent fibers could leach into the electrolyte, potentially degrading the function of the electrochemical element. Furthermore, if a nonwoven fabric containing residual solvent was used as a filter material, the solvent remaining in the nonwoven fabric's constituent fibers could leach into the filtered material, such as a gas or liquid, potentially contaminating it. Therefore, it was necessary to thoroughly heat the fabric to remove the solvent and prevent any residue from remaining. 【0004】 Methods for thoroughly removing such solvents and other substances were known, such as using heating equipment such as can dryers, calenders, hot air dryers, hot air drying machines, electric furnaces, and heat plates. 【0005】 However, these conventional heat treatment devices have difficulty in precisely controlling the temperature, making it difficult to uniformly heat the entire fiber sheet, such as nonwoven fabric, to the desired temperature. For example, with heating rollers and heat plates, the temperature at both ends of the heating area tends to be lower than the temperature in the center (the desired temperature), and with electric furnaces and hot air dryers, uneven heating tends to occur. 【0006】 As a heat treatment apparatus that can solve such uneven heating problems, a heating roller has been proposed in which "a spiral-shaped heat source for heating the cylindrical body is supported at a certain distance from the cylindrical body within a rotatable cylindrical body" (Patent Document 1). 【0007】 However, even with this heating roller, the temperature at both ends along the length of the roller tended to be lower than the temperature in the center between the ends, and it was not possible to improve the uneven heating to a satisfactory level. [Prior art documents] [Patent Documents] 【0008】 [Patent Document 1] Japanese Patent Publication No. 2011-165527 [Overview of the Initiative] [Problems that the invention aims to solve] 【0009】 This invention was made under such circumstances, and aims to provide a heating roller that can heat uniformly along its entire length. [Means for solving the problem] 【0010】 The present invention is a heating roller comprising a cylindrical body and an infrared radiation source located inside the cylindrical body and extending in the longitudinal direction of the cylindrical body, wherein the outer surface of the cylindrical body has a right-side overlapping outer region including a right-side overlapping outer region that overlaps with the vicinity of the right-side end of the projected image obtained by projecting the infrared radiation source working part onto the outer surface of the cylindrical body, a left-side overlapping outer region including a left-side overlapping outer region that overlaps with the vicinity of the left-side end of the projected image obtained by projecting the infrared radiation source working part onto the outer surface of the cylindrical body, and a central outer region between the right-side overlapping outer region and the left-side overlapping outer region, and the heating roller has a heat insulating layer or a heat shielding layer in the right-side overlapping outer region and the left-side overlapping outer region of the outer surface of the cylindrical body. 【0011】 Furthermore, "the length of the right overlapping outer region and the length of the left overlapping outer region on the outer surface of the cylindrical body are both 5 mm or more," "the infrared emissivity in the central outer region of the outer surface of the cylindrical body is 0.29 to 0.81," "the infrared emissivity in the central outer region of the outer surface of the outer surface of the cylindrical body is the same as or less than the infrared emissivity on the inner surface of the cylindrical body," "the infrared emissivity on the inner surface of the cylindrical body is 0.7 or more," and / or "the volume density of the central outer region of the outer surface of the outer surface of the cylindrical body is 1.0 W / cm³." 2 It is preferable that it is "more than or equal to" [Effects of the Invention] 【0012】 The heating roller of the present invention has a heat insulating layer or heat shielding layer on the right and left overlapping outer regions of the cylindrical outer surface, which prevents the temperature from dropping at both ends of the heating roller. As a result, the temperature is uniform and heating can be achieved uniformly along the entire length of the heating roller. Furthermore, since it utilizes heat transfer through radiation from an infrared radiation source, it also has the effect of suppressing power consumption. 【0013】 In particular, by ensuring that the lengths of both the right and left overlapping outer regions are 5 mm or more, temperature drops at both ends of the heating roller can be prevented, resulting in uniform heating and a consistent temperature across the entire length of the heating roller. 【0014】 Furthermore, the infrared emissivity in the central outer region of the cylindrical outer surface is 0.29 to 0.81, making it easy to emit infrared radiation. This relatively suppresses localized heat accumulation in the central outer region between the right and left outer end regions, allowing for more uniform heating across the entire length of the heating roller. Additionally, because the infrared emissivity in the central outer region of the cylindrical outer surface is 0.29 to 0.81, making it easy to emit infrared radiation, if the sheet-like material to be heat-treated, such as a fiber sheet, easily absorbs infrared radiation, the sheet can be heated efficiently. 【0015】 Furthermore, if the infrared emissivity in the central outer region is the same as or lower than the infrared emissivity on the inner surface of the cylinder, heat is more easily absorbed from the inner surface of the cylinder than from the outer surface, thus accumulating heat and facilitating heat transfer in the longitudinal direction of the cylinder. This allows for uniform heating across the entire length of the heating roller, making it easier to handle heat treatment at high temperatures of 350°C or higher. In particular, if the infrared emissivity on the inner surface of the cylinder is high, such as 0.7 or higher, infrared radiation is easily absorbed, and the cylinder heats up quickly, making it easier to handle heat treatment at high temperatures of 350°C or higher. 【0016】 Furthermore, the capacity density of the central outer region of the outer surface of the cylindrical body is 1.0 W / cm³. 2 This level of performance makes it easier to handle heat treatment at high temperatures, such as 350°C or above. [Brief explanation of the drawing] 【0017】 [Figure 1] (a) Front view of the heating roller of the present invention (b) Front view of the heating roller showing the projection image of the infrared radiation source working part onto the outer surface of the cylindrical body constituting the heating roller of (a) (c) Schematic front view showing the internal structure of the heating roller of (a) (d) Cross section of (c) along the CC line [Figure 2] (a) Front view of another heating roller of the present invention (b) Front view of the heating roller showing the projection image of the infrared radiation source working part onto the outer surface of the cylindrical body constituting the heating roller of (a) [Figure 3](a) Another front view of the heating roller of the present invention (b) Front view of the heating roller showing the projection image of the infrared radiation source acting portion on the outer surface of the cylinder constituting the heating roller of (a) [Figure 4] Front view of the heating roller when the heating roller of the present invention is in use [Figure 5] Graph showing the temperature distribution on the surface of the heating roller when the heating rollers of Example 1-1 and Comparative Example 1-1 are heated [Figure 6] Graph showing the temperature distribution on the surface of the heating roller when the heating rollers of Example 2-1, 2-2 and Comparative Example 2-1 are heated [Figure 7] Graph showing the temperature distribution on the surface of the heating roller when the heating rollers of Example 3-1, 3-2 and Comparative Example 3-1 are heated [Figure 8] Graph showing the temperature distribution on the surface of the heating roller when the heating rollers of Example 4-1, 4-2 and Comparative Examples 4-1, 4-2 are heated 【Mode for Carrying Out the Invention】 【0018】 Regarding the heating roller of the present invention, it will be described based on Fig. 1(a) which is a front view of the heating roller of the present invention, Fig. 1(b) which is a front view of the heating roller showing the projection image of the infrared radiation source acting portion on the outer surface of the cylinder constituting the heating roller of Fig. 1(a), Fig. 1(c) which is a schematic front view showing the internal structure of the heating roller of Fig. 1(a), and Fig. 1(d) which is a cross-sectional view taken along the C-C line of Fig. 1(c). 【0019】 As shown in Fig. 1(d), a cylinder body (Cb); As shown in Figs. 1(c) and (d), six rod-shaped infrared radiation sources (Sin) located on concentric circles at an angle of 60° around the axis of the cylinder body (Cb) and extending in the longitudinal direction of the cylinder body (Cb); As shown in Fig. 1(d), a buffer tube (Ts) for equalizing the radiation of infrared rays, located on the inner side of the infrared radiation source (Sin); As shown in Figure 1(c), a pair of support plates (PSR, PSL) are located at both ends of the infrared radiation source (Sin) in the longitudinal direction and support the infrared radiation source (Sin); As shown in Figure 1(c), a pair of internal insulation or internal heat shielding (IR, IL) is located outside the support plates (PSR, PSL) and prevents heat dissipation from both ends of the infrared radiation source (Sin); As shown in Figures 1(c) and (d), a composite shaft consisting of a right shaft plate (SBR), a left shaft plate (SBL), and six connecting shafts (Tin) connecting the right shaft plate (SBR) and the left shaft plate (SBL); and, As shown in Figures 1(a) and (b), the outer surface of the cylindrical body (Cbo) has an insulating layer or a heat-shielding layer (HIR, HIL) on the right overlapping outer region (OR) that overlaps with the vicinity of the right end of the projected image (Pd1, Pd2, Pd3) obtained by projecting the infrared radiation source (AI) onto the outer surface of the cylindrical body (Cbo), and the outer surface of the cylindrical body (Cbo) has an insulating layer or a heat-shielding layer (HIR, HIL) on the left overlapping outer region (OL) that overlaps with the vicinity of the left end. 【0020】 In this invention, the cylindrical body (Cb) is a pipe-shaped material with an annular cross-section that constitutes the surface of the heating roller. It absorbs infrared radiation emitted from an infrared radiation source (Si), stores heat, and / or emits infrared radiation, thereby heating sheet-like materials such as fiber sheets. 【0021】 The cylindrical body (Cb) can be any material that absorbs infrared radiation, stores heat, and / or emits infrared radiation, and is not particularly limited. Examples include: ceramic tubes made of ceramics such as mullite, alumina, zirconia, and magnesia; glass tubes such as quartz; metal tubes such as stainless steel alloys and aluminum alloys with an oxide film formed on their surface; tubes coated with paint containing an infrared-emitting material (e.g., oxide-based); tubes coated with an infrared-emitting paint (e.g., silicon-based); tubes sprayed or plated with an infrared-emitting material; tubes with an infrared-emitting material deposited as a thin film coating (e.g., PVD, CVD, etc.); tubes with a surface roughness adjusted to facilitate infrared radiation; or cylindrical bodies made of a combination of these as appropriate (e.g., ceramic tubes sprayed with an infrared-emitting material). 【0022】 The infrared emissivity of the outer surface (Cbo) of such a cylindrical body (Cb) can be 0.29 to 0.81, which is preferable. In other words, if the infrared emissivity of the outer surface (Cbo) of the cylindrical body is 0.29 or higher, localized heat accumulation is relatively suppressed, uniform heating can be achieved over the entire length of the heating roller, and infrared radiation is easily emitted, allowing for efficient heating of sheet-like heat-treated materials such as fiber sheets. On the other hand, if the infrared emissivity of the outer surface (Cbo) of the cylindrical body is 0.81 or lower, energy loss from the outer surface of the cylindrical body is reduced, allowing for efficient heating. 【0023】 Furthermore, if the heating roller of the present invention is intended for high-temperature heat treatment such as 350°C or higher, it is preferable that the cylindrical body (Cb) be made of a material with heat resistance of 450°C or higher, and more preferably of a material with heat resistance of 500°C or higher, so that the cylindrical body (Cb) does not break during heat treatment. Examples of such heat-resistant materials include ceramic tubes made of ceramics such as mullite, alumina, zirconia, and magnesia; glass tubes made of quartz or similar material; and metal tubes made of stainless steel alloys, aluminum alloys, etc. 【0024】 Furthermore, cylindrical tubes (Cb) made of ceramic tubes, glass tubes, or tubes coated with materials such as ceramics and glass are preferable because impurities such as metals and organic compounds are less likely to be mixed into sheet-like heat-treated materials such as fiber sheets during heat treatment. 【0025】 The length of the cylindrical body (Cb) is not particularly limited, as long as it is longer than the width of the sheet-like heat-treated material such as a fiber sheet. Furthermore, the inner diameter of the cylindrical body (Cb) is not particularly limited, as long as it can accommodate the infrared radiation source (Sin). 【0026】 Furthermore, the wall thickness of the cylindrical body is determined by a combination of factors such as the constituent material of the cylindrical body and the emissivity of the outer surface, and is not particularly limited. However, generally speaking, a thicker wall thickness (3 mm or more) of the cylindrical body (Cb) is preferable because it increases the thermal diffusion in the planar direction of the cylindrical body, making it easier to achieve a uniform temperature distribution, and also makes it easier to perform uniform heat treatment on sheet-like heat-treated materials such as fiber sheets, as it reduces the likelihood of sudden temperature changes. 【0027】 In this invention, the infrared radiation source (Sin) extends along the longitudinal direction of the cylindrical body (Cb), and by emitting infrared radiation, it can heat the entire longitudinal direction of the cylindrical body (Cb). In the heating roller (HR) of Figure 1, six rod-shaped infrared radiation sources (Sin) are arranged concentrically around the axis of the cylindrical body (Cb) at equal angles of 60°, so that the entire cylindrical body (Cb) can be heated uniformly. However, if the entire cylindrical body (Cb) can be heated uniformly, it is not necessary for the radiation sources to be arranged concentrically around the axis of the cylindrical body (Cb), at equal angles, to be six in number, or to be rod-shaped. Nevertheless, arranging the rod-shaped infrared radiation sources (Sin) concentrically around the axis of the cylindrical body (Cb) at equal angles makes it easier to heat the cylindrical body (Cb) uniformly. 【0028】 Furthermore, if the ratio (Lc / La) of the total length (Lc) of the cylindrical body (Cb) to the total length (La) of the infrared radiation source part (AI) is large, heat dissipation from both ends of the cylindrical body (Cb) increases, making it difficult to achieve a uniform temperature distribution in the longitudinal direction. Therefore, (Lc / La) is preferably 1.0 to 2.0, more preferably 1.0 to 1.6, even more preferably 1.0 to 1.4, even more preferably 1.0 to 1.2, and even more preferably 1.0 to 1.1. 【0029】 The infrared radiation source area (AI) refers to the part where infrared radiation is effective. As described later, both ends of the infrared radiation source (Sin) in the longitudinal direction are supported by a pair of support plates (PSR, PSL). Therefore, the radiation state of infrared radiation changes depending on the pair of support plates (PSR, PSL). Thus, in the heating roller (HR) in Figure 1, the infrared radiation source area (AI) refers to the part between the inner surfaces of the pair of support plates (PSR, PSL), as shown in Figure 1(b). 【0030】 Furthermore, it is preferable that the infrared radiation source (Sin) is positioned such that its midpoint in the longitudinal direction coincides with the midpoint of the cylindrical body (Cb) in the longitudinal direction, so that the entire cylindrical body (Cb) can be heated uniformly. 【0031】 This infrared radiation source (Sin) can be anything that can emit infrared radiation and is not particularly limited, but examples include halogen lamps; heating elements made of carbon fiber or graphite; metal heating elements such as electric heating wires covered with ceramic or oxide coatings; and sheathed heaters with oxide coatings or infrared radiation paints applied to the sheath surface. 【0032】 This infrared radiation source (Sin) can emit infrared radiation by being powered from a power source (not shown). 【0033】 Thus, the rod-shaped infrared radiation source (Sin) extends along the longitudinal direction of the cylindrical body (Cb). To support this infrared radiation source (Sin), the infrared radiation source (Sin) has a pair of circular support plates (PSR, PSL) at both ends in the longitudinal direction of the infrared radiation source (Sin), each with a through hole into which the infrared radiation source (Sin) can be inserted. As shown in Figure 1(d), if the outer diameter of the pair of support plates (PSR, PSL) is smaller than the inner diameter of the cylindrical body (Cb), frictional resistance is not generated even when the cylindrical body (Cb) rotates, thus homogenizing the infrared radiation and making it easier to heat the entire cylindrical body (Cb) uniformly. The infrared radiation source (Sin) may be rotated by rotating the pair of support plates (PSR, PSL), or the infrared radiation source (Sin) may be fixed without rotating the pair of support plates (PSR, PSL). 【0034】 Furthermore, it is preferable that the pair of support plates (PSR, PSL) easily reflect infrared rays so that they can act as partitions separating the infrared radiation source (AI) from the outer regions at both ends, absorbing infrared rays emitted from near the ends of the infrared radiation source (AI) and preventing energy loss due to heat transfer. For example, it is preferable that the surfaces of the pair of support plates (PSR, PSL) are polished to a mirror finish so that they can reflect infrared rays. It is also preferable that the pair of support plates (PSR, PSL) are made of a stainless steel alloy or nickel alloy with high heat resistance. 【0035】 Furthermore, it has a pair of internal insulation or internal heat shielding materials (IR, IL) located outside the support plates (PSR, PSL) to prevent heat dissipation from both ends of the infrared radiation source (Sin). This pair of internal insulation or internal heat shielding materials (IR, IL) has a circular outer shape. Note that if the outer diameter of the pair of internal insulation or internal heat shielding materials (IR, IL) is smaller than the inner diameter of the cylindrical body (Cb), then, similar to the support plates (PSR, PSL), frictional resistance will not be generated even if the cylindrical body (Cb) rotates, thus homogenizing the infrared radiation and making it easier to heat the entire cylindrical body (Cb) uniformly. 【0036】 Examples of internal insulation materials include materials formed by molding reinforcing materials such as glass fibers and aramid fibers with cement, or ceramic plates. Examples of internal heat shielding materials include stainless steel alloy plates and aluminum alloy plates. 【0037】 In Figure 1, nothing is shown in the space between the support plates (PSR, PSL) and the internal insulation material or internal heat shielding material (IR, IL). However, it is preferable to provide a heat-resistant insulation material in the space between the support plates (PSR, PSL) and the internal insulation material or internal heat shielding material (IR, IL) to suppress the temperature drop at both ends of the infrared radiation source (Sin). Suitable heat-resistant insulation materials include, for example, glass wool, AES wool, alumina fiber, silica aerogel, calcium silicate, etc., with a thermal conductivity of less than 0.1 W / (m·K). 【0038】 In the heating roller (HR) shown in Figure 1, there is a buffer tube (Ts) located inside the infrared radiation source (Sin), with a pipe shape having an annular cross-section, which is in contact with the infrared radiation source (Sin) to equalize the radiation of infrared rays. Preferably, this buffer tube can also absorb infrared rays emitted from the infrared radiation source (Sin) and store heat and / or emit infrared rays, so that the cylindrical body (Cb) can be heated more uniformly. 【0039】 Therefore, the buffer tube (Ts) is preferably made of a material that, like the cylindrical body (Cb), absorbs infrared radiation and generates heat and / or emits infrared radiation. For example, it is preferably a ceramic tube or a stainless steel tube coated with an infrared-emitting paint. 【0040】 In Figure 1(d), the buffer tube (Ts) is located inside the infrared radiation source (Sin), but it is not necessary to have it, or it may be located outside the infrared radiation source (Sin). 【0041】 Furthermore, if a buffer tube (Ts) is provided, whether it is located inside or outside the infrared radiation source (Sin), the infrared emissivity of the buffer tube (Ts) is preferably 0.8 or higher, and more preferably 0.9 or higher, so that it can absorb and emit infrared radiation to efficiently heat the cylindrical body (Cb). 【0042】 The heating roller (HR) in Figure 1 further comprises a composite shaft consisting of a right shaft plate (SBR), a left shaft plate (SBL), and six connecting shafts (Tin) that connect the right shaft plate (SBR) and the left shaft plate (SBL). The connecting shafts (Tin) support the support plates (PSR, PSL) and the internal insulation or internal heat shielding material (IR, IL). Therefore, if the composite shaft is not rotated, the infrared radiation source (Sin) can be held in a stationary state. When the composite shaft is rotated, the support plates (PSR, PSL) and the internal insulation or internal heat shielding material (IR, IL) rotate, and as a result, the infrared radiation source (Sin) rotates, allowing for uniform emission of infrared radiation. 【0043】 The materials that make up the right shaft plate (SBR), left shaft plate (SBL), and connecting shaft (Tin) of this composite shaft only need to be able to support the support plate (PSR, PSL) and the internal insulation material or internal heat shielding material (IR, IL), and are not particularly limited, but stainless steel alloy is preferred, for example. 【0044】 When rotating the composite shaft, it can be rotated by a conventional rotating means (not shown). In particular, rotating the composite shaft with a rotational power source using a servo mechanism is preferable because it allows for more uniform control of the heat treatment conditions for the sheet-like workpiece. 【0045】 The heating roller (HR) of the present invention is configured as described above, and as shown in Figure 1(b), the outer surface (Cbo) of the cylindrical body (Cb) has a right-side outer region (Ro) including a right-side overlapping outer region (OR) that overlaps with the vicinity of the right-side end, a left-side outer region (Lo) including a left-side overlapping outer region (OL) that overlaps with the vicinity of the left-side end, and a central outer region (Co) between the right-side outer region (Ro) and the left-side outer region (Lo), based on the projected image (Pd1, Pd2, Pd3) obtained by projecting the infrared radiation source (AI) onto the outer surface (Cbo) of the cylindrical body. 【0046】 Furthermore, the heating roller (HR) of the present invention has a heat insulating layer or a heat shielding layer (HIR, HIL) on the cylindrical outer surface (Cbo) corresponding to the right overlapping outer region (OR) and the left overlapping outer region (OL), respectively. 【0047】 This thermal insulation layer or heat shielding layer (HIR, HIL) may be composed of a separate material that is separable from the outer surface of the cylindrical body (Cbo), or it may be composed of an inseparable layer. 【0048】 Examples of the former, separable insulation layer made of a separate material, include silica cloth sheets; ceramic cloth sheets; sheet-like insulation materials or cylindrical molded insulation materials made of glass wool, AES wool, alumina fiber, silica aerogel, calcium silicate, etc. 【0049】 Furthermore, examples of heat-shielding layers made of separate materials include aluminum foil, metal sheets such as shims, metal sleeves, and metal tubes. 【0050】 If this insulating or heat-shielding layer (HIR, HIL) is made of a separate material that can be separated from the outer surface of the cylindrical body (Cbo), it has the advantage that the material and arrangement of the insulating or heat-shielding layer can be appropriately adjusted according to the configuration of the heating roller or heating conditions. 【0051】 The latter, an inseparable heat insulating layer or heat shielding layer (HIR, HIL), can be formed by processing the outer surface (Cbo) of the cylindrical body. For example, a heat shielding layer can be formed by thermal spraying a metallic material such as aluminum or coating a heat-shielding paint onto the outer surface (Cbo) of a cylindrical body corresponding to the right overlapping outer region (OR) and left overlapping outer region (OL) of a ceramic tube made of ceramics such as mullite, alumina, zirconia, or magnesia, or a glass tube made of quartz. 【0052】 As an additional, inseparable insulating or heat-shielding layer (HIR, HIL), the emissivity of the central outer region (Co) of a metal pipe, such as a stainless steel alloy or aluminum alloy, can be increased by applying an oxide film treatment, coating it with a paint containing infrared-emitting material, thermal spraying or plating it with an infrared-emitting material, forming an infrared-emitting material as a thin film coating, or adjusting the surface roughness to facilitate infrared emission. This increases the emissivity of the central outer region (Co) and relatively lowers the emissivity of the right outer region (Ro) and left outer region (Lo), including the right overlapping outer region (OR) and left overlapping outer region (OL). As a separate, inseparable insulating or heat-shielding layer (HIR, HIL), the right outer region (Ro) and left outer region (Lo) can be made to function as an insulating or heat-shielding layer (HIR, HIL). 【0053】 This insulating or heat-shielding layer (HIR, HIL) is formed by processing the outer surface (Cbo) of the cylindrical body, and if an inseparable insulating or heat-shielding layer (HIR, HIL) is formed without impairing the smoothness of the outer surface (Cbo), then a sheet-like heat-treated material wider than the central outer region (Co) can be heat-treated. 【0054】 The length of the cylindrical body (Cb) in the right overlapping outer region (OR) and the left overlapping outer region (OL) is not particularly limited, as the preferred length varies depending on the emissivity of the central outer region (Co) of the cylindrical body (Cb). However, to prevent the temperature from becoming too low at both ends of the heating roller, it is preferably 5 mm or more, more preferably 10 mm or more, even more preferably 30 mm or more, and even more preferably 50 mm or more. On the other hand, if it is too long, it tends to become difficult to heat-treat sheet-like materials such as wide fiber sheets, so it is preferably 200 mm or less, more preferably 180 mm or less, and even more preferably 160 mm or less. 【0055】 The lengths of the right overlapping outer region (OR) and the left overlapping outer region (OL) may be the same or different, and can be arbitrarily adjusted according to the design and specifications of the heating roller (HR). However, if the lengths of the right overlapping outer region (OR) and the left overlapping outer region (OL) are the same, it is easier to heat the heating roller (HR) uniformly. 【0056】 In the heating roller (HR) shown in Figure 1, the cylindrical outer surface (Cbo) corresponding to the right overlapping outer region (OR) and the left overlapping outer region (OL) has an insulating layer or a heat-shielding layer (HIR, HIL). The right overlapping outer region (OR) and the left overlapping outer region (OL) may have the same insulating layer or heat-shielding layer (HIR, HIL), or they may have different insulating layers or heat-shielding layers (HIR, HIL). Alternatively, one of the right overlapping outer region (OR) or the left overlapping outer region (OL) may have an insulating layer and the other may have a heat-shielding layer. However, it is preferable that the layers be the same so that the degree of thermal control by the insulating layer or heat-shielding layer is similar at both ends of the heating roller (HR) and the temperature distribution along the length of the central outer region (Co) of the heating roller (HR) is more uniform. 【0057】 Furthermore, in Figure 1(a), the insulating layer or heat shielding layer (HIR, HIL) is present only on the cylindrical outer surface (Cbo) corresponding to the right overlapping outer region (OR) and the left overlapping outer region (OL). However, the insulating layer or heat shielding layer may also be present on part or all of the regions other than the right end outer region (Ro) and / or the left end outer region (Lo), excluding the infrared radiation source area (AI). 【0058】 For example, as shown in Figure 2(a) a front view of the heating roller and (b) a front view of the heating roller showing the projection image of the infrared radiation source working part on the outer surface of the cylindrical body, a heat insulating layer or heat shielding layer (HIR, HIL) is also provided in a portion of the right non-overlapping outer region (NR) and left non-overlapping outer region (NL) in the right outer region (Ro) and left outer region (Lo), which are not the right overlapping outer region (OR) and left overlapping outer region (OL), and are not the infrared radiation source working part (AI). Having a heat insulating layer or heat shielding layer (HIR, HIL) in a portion of the right non-overlapping outer region (NR) and left non-overlapping outer region (NL) in this way is preferable because it makes thermal management easier and facilitates uniform temperature distribution in the longitudinal direction of the central outer region (Co) of the heating roller (HR). 【0059】 Similarly, as shown in Figure 3(a) a front view of the heating roller and (b) a front view of the heating roller showing the projection image of the infrared radiation source working part on the outer surface of the cylindrical body, the entire regions of the right non-overlapping outer region (NR) and left non-overlapping outer region (NL) in the right outer region (Ro) and left outer region (Lo), excluding the right overlapping outer region (OR) and left overlapping outer region (OL), and excluding the infrared radiation source working part (AI), also have an insulating layer or heat shielding layer (HIR, HIL). Having an insulating layer or heat shielding layer (HIR, HIL) in the entire regions of the right non-overlapping outer region (NR) and left non-overlapping outer region (NL) in this way is preferable because it makes thermal management easier and facilitates uniform temperature distribution along the length of the central outer region (Co) of the heating roller (HR). 【0060】 In Figure 1 of the present invention, the heating roller (HR) has a pair of support plates (PSR, PSL) and a cylindrical body (Cb) that are spaced apart, so even if the composite shaft rotates, the cylindrical body (Cb) does not rotate. The cylindrical body (Cb) may or may not rotate, but rotation is advantageous when it comes into contact with a sheet-like material to be heat-treated, such as a fiber sheet, for heat treatment. In other words, rotation of the cylindrical body (Cb) prevents excessive friction between the sheet-like material to be heat-treated and the cylindrical body (Cb), thus preventing damage to the surface condition of the sheet-like material to be heat-treated. Therefore, it is preferable that the cylindrical body (Cb) can rotate. 【0061】 Specifically, as shown in Figure 4, a front view of the heating roller when it is in use, a pair of circular ring supports (CSR, CSL) are attached to the cylindrical surface (Cbo) of the heating roller (HR) in the areas (INR, INL) where there is no heat insulating layer or heat shielding layer (HIR, HIL) in the right end outer region (Ro) and the left end outer region (Lo). By transmitting power from a motor or the like to this pair of circular ring supports (CSR, CSL) via an endless belt or the like, the cylindrical body (Cb) can be rotated. 【0062】 Furthermore, if heat transfer through this pair of circular ring supports (CSR, CSL) is large, the temperature distribution along the length of the outer central region (Co) of the cylindrical body (Cb) tends to become uneven. Therefore, it is preferable to attach this pair of circular ring supports (CSR, CSL) to the cylindrical body surface (Cbo) by fixing them in a way that minimizes the contact area, such as by using bolts for point contact. It is also preferable to interpose a heat-resistant insulating material between the pair of circular ring supports (CSR, CSL) and the cylindrical body surface (Cbo), such as a heat-resistant insulating material composed of glass wool, AES wool, alumina fiber, silica aerogel, calcium silicate, etc., or a heat-resistant insulating material composed of cement, etc., with reinforcing materials such as glass fiber and aramid fiber. Furthermore, the mounting position of this pair of circular ring supports (CSR, CSL) on the cylindrical surface (Cbo) is preferably in an area (INR, INL) away from the infrared radiation source (AI) and where there is no insulating layer or heat shielding layer (HIR, HIL), as shown in Figure 4. In particular, within the area (INR, INL) where there is no insulating layer or heat shielding layer (HIR, HIL), it is preferable that it be the position furthest from the infrared radiation source (AI) and furthest from the insulating layer or heat shielding layer (HIR, HIL), as shown in Figure 4. 【0063】 Furthermore, when rotating the cylindrical body (Cb), it is preferable to use a rotational power source with a servo mechanism, as this allows for more uniform control of the heat treatment conditions for the sheet-like material to be heat-treated. 【0064】 The infrared emissivity in the central outer region (Co) of the outer surface (Cbo) of the cylindrical body (Cb) of the present invention is preferably 0.29 to 0.81. When the infrared emissivity is 0.29 or higher, localized heat accumulation in the central outer region (Co) is relatively suppressed, allowing for uniform heating along the entire length of the heating roller, and also allowing for efficient heating of sheet-like heat-treated materials such as fiber sheets because infrared radiation is easily emitted. A more preferable infrared emissivity is 0.40 or higher, and an even more preferable infrared emissivity is 0.50 or higher. On the other hand, if the infrared emissivity exceeds 0.81, energy loss from the outer surface (Cbo) is large, and heating cannot be done efficiently, so it is preferable to have an infrared emissivity of 0.81 or lower, and more preferably 0.75 or lower. 【0065】 In this invention, the emissivity is determined by placing a contact-type temperature sensor (manufactured by Anritsu Keiki Co., Ltd.) on the outer surface (Cbo) of a cylindrical body (Cb), heating a heating roller, and adjusting the emissivity setting value so that the readings of the contact-type temperature sensor and the radiation thermometer (manufactured by Horiba, Ltd.) become equal. The emissivity at this time is defined as the emissivity of the object being measured. 【0066】 Furthermore, it is preferable that the infrared emissivity in the central outer region (Co) is the same as or lower than the infrared emissivity on the inner surface (Cbi) of the cylinder. With such infrared emissivity, the infrared radiation is more easily absorbed from the inner surface (Cbi) of the cylinder (Cb) than from the outer surface (Cbo), allowing for heat storage and easier handling of high-temperature heat treatments of 350°C or higher. In particular, a high infrared emissivity of 0.7 or higher on the inner surface (Cbi) of the cylinder is preferable because it makes it easier to raise the temperature inside the cylinder, thus facilitating heat treatments of 350°C or higher. 【0067】 Such cylindrical inner surfaces (Cbi) with an infrared emissivity of 0.7 or higher can be fabricated, for example, by applying an infrared-emitting paint. 【0068】 In the heating roller (HR) of the present invention, the right overlapping outer region (OR) and the left overlapping outer region (OL) of the outer surface (Cbo) of the cylindrical body (Cb) have an insulating layer or a heat-shielding layer (HIR, HIL), but the inner surface (Cbi) of the cylindrical body (Cb) can also have an insulating layer or a heat-shielding layer. By having such an insulating layer or a heat-shielding layer, the temperature drop at both ends of the heating roller (HR) can be suppressed even further. The insulating layer or heat-shielding layer on the inner surface (Cbi) of the cylindrical body (Cb) can be present only on a part or all of the inner surface (Cbi) corresponding to the right non-overlapping outer region (NR) and the left non-overlapping outer region (NL), excluding the right overlapping outer region (OR) and the left overlapping outer region (OL). 【0069】 The insulating or heat-shielding layer that can form the inner surface (Cbi) of this cylindrical body (Cb) can be, for example, a cylindrical molded insulating material made of glass wool, AES wool, alumina fiber, silica aerogel, calcium silicate, etc.; heat-shielding paint; metal sheets such as aluminum foil or shim material; metal sleeves; metal pipes; etc. 【0070】 Furthermore, when the inner surface (Cbi) of the cylindrical body (Cb) has an insulating layer or a heat-shielding layer, it is preferable that the infrared emissivity in the central outer region (Co) is the same as or lower than the infrared emissivity in the region of the inner surface (Cbi) that does not have an insulating layer or a heat-shielding layer. It is also preferable that the infrared emissivity in the region of the inner surface (Cbi) that does not have an insulating layer or a heat-shielding layer is high, at 0.7 or higher. 【0071】 Furthermore, the capacity density (hereinafter sometimes simply referred to as "capacity density") of the central outer region of the outer surface of the cylindrical body is 1.0 W / cm². 2 A capacity density of 1.5 W / cm² is suitable for applications requiring high-temperature heat treatment, as it can easily withstand heat treatment at temperatures above 350°C. A higher capacity density allows for better handling of high-temperature heat treatment; therefore, a capacity density of 1.5 W / cm² is desirable. 2 It is more preferable that it be greater than or equal to 2.0 W / cm². 2It is even more preferable that the value is 2.8 W / cm². 2 It is even more preferable if the above conditions are met. 【0072】 The capacity density of the central outer region of the heating roller (HR) surface is the value obtained by dividing the capacity per unit length of the infrared radiation source (AI) in the infrared radiation source (Sin) by the area of ​​the region on the cylindrical outer surface (Cbo) that is the same length as the infrared radiation source (AI). 【0073】 The heating roller (HR) shown in Figure 1 of the present invention operates as follows. 【0074】 In the present invention, when an infrared radiation source (Sin) is energized from a power source (not shown) to the heating roller (HR) shown in Figure 1, infrared radiation is emitted from the infrared radiation source (Sin). This emitted infrared radiation is absorbed by the cylindrical body (Cb) and the buffer tube (Ts), and heat is transferred and stored inside the cylindrical body (Cb) and the buffer tube (Ts). Then, infrared radiation is emitted from the cylindrical body (Cb) and the buffer tube (Ts). 【0075】 In the area (AI) where infrared radiation is emitted from the infrared radiation source (Sin) of the cylindrical body (Cb), the areas near both ends tend to have a lower temperature than the central outer region (Co) due to heat transfer and thermal radiation. However, in the heating roller (HR) of the present invention, the cylindrical body (Cb) has an insulating layer or a heat shielding layer (HIR, HIL) in the right overlapping outer region (OR) and the left overlapping outer region (OL). 【0076】 Therefore, when an insulating layer is present, heat transfer is suppressed and heat is stored in the right overlapping outer region (OR) and the left overlapping outer region (OL), and thermal radiation is also suppressed, thereby suppressing the temperature drop near the right overlapping outer region (OR) and the left overlapping outer region (OL). As a result, the temperature can be uniformly heated along the entire length of the central outer region (Co) of the heating roller. 【0077】 On the other hand, if a heat shield layer is present, the right overlapping outer region (OR) and the left overlapping outer region (OL) suppress heat radiation outward from the heating roller (HR), which acts in the direction of heat accumulation in the cylindrical body (Cb), thereby suppressing the temperature drop near the right overlapping outer region (OR) and the left overlapping outer region (OL). As a result, the temperature can be uniformly heated along the entire length of the central outer region (Co) of the heating roller. 【0078】 Thus, since the heating roller (HR) of the present invention has a uniform temperature throughout the entire length of the central outer region (Co), a sheet-like material to be heat-treated can be uniformly heat-treated by directly or indirectly contacting or bringing it close to this central outer region (Co). Indirect contact of the sheet-like material to be heat-treated with the central outer region (Co) means interposing a non-porous material such as paper or film, or a porous material such as nonwoven fabric or mesh, between the sheet-like material to be heat-treated and the heating roller (HR) to bring the sheet-like material to contact the heating roller (HR). 【0079】 Furthermore, in the heating roller (HR) shown in Figure 4, the cylindrical body (Cb) can rotate, allowing for more uniform heating of the cylindrical body (Cb). Additionally, even if the sheet-like material to be heat-treated is brought into direct contact with the central outer region (Co) of the outer surface (Cbo) of the cylindrical body, it is preferable to synchronize the rotation speed of the cylindrical body (Cb) with the conveying speed of the sheet-like material to ensure uniform heat treatment without damaging the surface condition of the sheet-like material due to friction. Rotating the infrared radiation source (Sin) also allows for more uniform heating of the cylindrical body (Cb). 【0080】 For example, by rotating the cylindrical body (Cb) of the present invention with a rotary power source equipped with a servo mechanism, and simultaneously controlling the draw of multiple transport rollers, a fiber sheet containing liquids such as dispersion media and solvents, such as electrospun nonwoven fabrics and wet nonwoven fabrics, with a basis weight of 5 g / m² is produced. 2Even low-weight fiber sheets, or low-strength fiber sheets with a tensile strength of 5N / 5cm width or less in the conveying direction, can be uniformly heat-treated without causing wrinkles in the fiber sheets. 【0081】 Furthermore, in the heating roller (HR) shown in Figure 4, the cylindrical body (Cb) and the infrared radiation source (Sin) can rotate independently. However, if both rotate, and the rotation direction and rotation speed of the infrared radiation source (Sin) and the cylindrical body (Cb) are the same, it is no different from when both the cylindrical body (Cb) and the infrared radiation source (Sin) are stationary. Therefore, it is preferable that the rotation direction and / or rotation speed of the cylindrical body (Cb) and the infrared radiation source (Sin) are different. 【0082】 Furthermore, when it is necessary to heat-treat a sheet-like material at a high temperature of 350°C or higher, it is preferable to use a cylindrical body (Cb) in which the infrared emissivity in the central outer region (Co) is the same as or smaller than the infrared emissivity in the inner surface (Cbi), and in particular, it is preferable to use a cylindrical body (Cb) in which the infrared emissivity in the inner surface (Cbi) is 0.7 or higher. Also, the capacity density of the heating roller (HR) surface should be 1.0 W / cm³. 2 To achieve the above, it is preferable to use a combination of cylindrical bodies (Cb) and infrared radiation sources (Sin) as appropriate. [Examples] 【0083】 The present invention will be specifically described below with reference to examples, but these examples are not intended to limit the scope of the present invention. 【0084】 (Example 1-1, Comparative Example 1-1) A heating roller (HR) was fabricated as shown in Figures 1 and 2. 【0085】 (1) Cylindrical body (Cb); A mullite HB cylindrical tube with an annular cross-section (inner diameter: 85 mm, outer diameter: 100 mm, wall thickness: 7.5 mm) (length: 840 mm, emissivity of outer surface: 0.81, emissivity of inner surface: 0.81). 【0086】 (2) Infrared radiation source (Sin); Six rod-shaped infrared heaters (outer diameter 8 mm, heating element length: 500 mm, 750 W) are arranged concentrically around the axis of the cylindrical body (Cb) at equal angles of 60°. Each of the six infrared heaters is positioned so that its midpoint coincides with the midpoint of the cylindrical body's length. 【0087】 (3) A pair of support plates (PSR, PSL); A pair of circular stainless steel plates (outer diameter: 80 mm, thickness: 5 mm) are arranged at 450 mm intervals, each having 12 through-holes (diameter: 8 mm) at equal 30° angles to the center, 58 mm from the center, through which an infrared heater or connecting shaft can be inserted. 【0088】 (4) A pair of internal insulation or internal heat shielding materials (IR, IL); A pair of circular stainless steel plates (outer diameter: 80 mm, thickness: 5 mm) are positioned 25 mm outside the pair of support plates (PSR, PSL). Each plate has six through-holes (diameter: 8 mm) for inserting a connecting shaft, located 58 mm from the center and spaced at equal 60° angles concentrically with respect to the center. 【0089】 (5) Heat-resistant insulating material; A circular calcium silicate plate (outer diameter: 80 mm, thickness: 25 mm) is placed between a pair of support plates (PSR, PSL) and a pair of internal insulation or internal heat shielding materials (IR, IL). The plate has 12 through-holes (diameter: 8 mm) at a position 58 mm from the center, through which an infrared heater or connecting shaft can be inserted, arranged concentrically with the center at equal angles of 30°. 【0090】 (6) Buffer tube (Ts); A buffer tube made of mullite HB, with a circular cross-section (inner diameter: 42 mm, outer diameter: 50 mm, wall thickness: 4 mm) and a pipe-like shape (450 mm long), is positioned inside the infrared heater (emissivity of the outer surface: 0.81). 【0091】 (7) Composite shaft; A circular disk part (outer diameter: 80 mm, thickness: 5 mm) made of stainless steel, having six circular recesses (diameter: 8 mm) at a position 58 mm from the center where a connection shaft can be inserted, concentric with the center and at equal angles of 60°, and a columnar shaft part (outer diameter: 34 mm) made of stainless steel and protruding from the center of the disk part, which are composed of a right shaft plate (SBR) and a left shaft plate (SBL), and six stainless steel connection shafts (Tin) (outer diameter: 8 mm) that are fixed by the recesses of the right shaft plate (SBR) and the left shaft plate (SBL) and penetrate through the through holes of a pair of support plates (PSR, PSL), a heat-resistant heat insulation material, and a pair of internal heat insulation materials or internal heat shielding materials (IR, IL). 【0092】 Note that the infrared radiation source (Sin) and the connection shaft (Tin) penetrate through the alternating through holes of the support plates (PSR, PSL), etc. That is, the infrared radiation source (Sin) starts from a certain through hole as the starting point X (0°) and penetrates through the through holes at 60°, 1​​​​​​​​​​​​​​​​​ 【0096】 [Table 2] 【0097】 (Evaluation of the heated roller) As shown in Figure 4, in the heating rollers of Example 1-1 and Comparative Example 1-1, a pair of stainless steel circular ring supports (CSR, CSL) (outer diameter: 120 mm, inner diameter: 110 mm, width: 15 mm) were bolted to both ends of the regions (INR, INL) on the cylindrical surface (Cbo) where there was no heat insulating layer or heat shielding layer (HIR, HIL). By transmitting motor power to this pair of circular ring supports (CSR, CSL) via an endless belt, only the cylindrical body (Cb) constituting the heating roller was rotated at a peripheral speed of 200 mm / min. Power was also supplied to an infrared radiation source to heat the surface of the outer central region (Cbo) of the heating roller (HR) to approximately 430°C, and the temperature distribution in the longitudinal direction of the outer central region (Co), that is, the region where sheet-like heat-treated materials such as fiber sheets can be processed, was measured. The results are shown in Figure 5. In Figure 5, the midpoint of the outer central region (Co) is defined as measurement position 0, and the temperatures on both sides of it are shown. 【0098】 As shown in Figure 5, the heating roller (HR) of Example 1-1, which has insulating layers (HIR, HIL) in the right and left overlapping outer regions of the cylindrical outer surface, exhibited minimal temperature drop at both ends and was able to uniformly heat-treat the sheet-like material. In particular, it was found that when the lengths of the right overlapping outer region (OR) and the left overlapping outer region (OL) on the cylindrical outer surface were both 5 mm or more, the temperature drop at both ends was minimized, and the sheet-like material could be uniformly heat-treated. 【0099】 Furthermore, when power is supplied to the infrared radiation source (Sin) to heat the surface of the outer central region (Co) of the heating roller (HR) to 350°C, the power consumption is 1580W, and the power consumption density per unit area of ​​a region on the outer surface of the cylindrical body (Cbo) that is the same length as the infrared radiation source working part (AI) is 1.0W / cm². 2 That was the case. 【0100】 (Examples 2-1, 2-2, Comparative Example 2-1) A heating roller (HR) was fabricated as shown in Figure 1. 【0101】 (1) Cylindrical body (Cb); A radioactive aluminum cylindrical tube with a ring-shaped cross-section (inner diameter: 90 mm, outer diameter: 100 mm, wall thickness: 5 mm, length: 700 mm), in which the outer surface of the pipe-shaped aluminum cylindrical tube is treated with heat-resistant anodizing, and the inner surface is coated with heat-resistant infrared radiation paint (emissivity of the outer surface: 0.75, emissivity of the inner surface: 0.89). 【0102】 (2) Infrared radiation source (Sin); Six rod-shaped infrared heaters (outer diameter 8 mm, heating element length: 700 mm, 1050 W) are arranged concentrically around the axis of the cylindrical body (Cb) at equal 60° angles. Each of the six infrared heaters is positioned so that its midpoint coincides with the midpoint of the cylindrical body's length. 【0103】 (3) A pair of support plates (PSR, PSL); A pair of circular stainless steel plates (outer diameter: 85 mm, thickness: 5 mm) are arranged at 650 mm intervals, each having 12 through-holes (diameter: 8 mm) at equal 30° angles to the center, 58 mm from the center, through which an infrared heater or connecting shaft can be inserted. 【0104】 (4) A pair of internal insulation or internal heat shielding materials (IR, IL); A pair of circular stainless steel plates (outer diameter: 85 mm, thickness: 5 mm) are positioned 25 mm outside the pair of support plates (PSR, PSL), each having six through-holes (diameter: 8 mm) at equal 60° angles concentrically with respect to the center, 58 mm from the center, into which a connecting shaft can be inserted. 【0105】 (5) Heat-resistant insulating material; A circular inorganic insulation board (outer diameter: 85 mm, thickness: 25 mm) made of AES wool, amorphous silica, and silicon carbide is placed between a pair of support plates (PSR, PSL) and a pair of internal insulation materials or internal heat shielding materials (IR, IL). This board has 12 through holes (diameter: 8 mm) at a position 58 mm from the center, each at a constant angle of 30° to the center, allowing for the insertion of an infrared heater or connecting shaft. 【0106】 (6) Buffer tube (Ts); A buffer tube (with an emissivity of the outer surface of 0.88) is placed outside the infrared heater. This buffer tube is a 650mm long stainless steel pipe with an annular cross-section (inner diameter: 72.3mm, outer diameter: 76.3mm, wall thickness: 2mm) and both the outer and inner surfaces are fully coated with infrared radiation paint. 【0107】 (7) Composite shaft; The structure consists of a right shaft plate (SBR) and a left shaft plate (SBL), each composed of a circular disc made of stainless steel, with six circular recesses (diameter: 8mm) located 58mm from the center, each at a 60° angle concentrically with respect to the center; and a columnar shaft portion (outer diameter: 34mm) made of stainless steel protruding from the center of the disc. The structure is fixed in the recesses of the right shaft plate (SBR) and the left shaft plate (SBL), and consists of six stainless steel connecting shafts (Tin) (outer diameter: 8mm) that pass through holes in a pair of support plates (PSR, PSL), a heat-resistant insulation material, and a pair of internal insulation or internal heat shielding materials (IR, IL). 【0108】 The infrared radiation source (Sin) and the connecting shaft (Tin) pass through alternating through holes in the support plates (PSR, PSL), etc. In other words, the infrared radiation source (Sin) starts from a certain through hole X (0°) and passes through through holes at 60°, 120°, 180°, 240°, 300°, and 360°, while the connecting shaft starts from a certain through hole X (0°) and passes through through holes at 30°, 90°, 150°, 210°, 270°, and 330°. 【0109】 (8) Right edge outer area (Ro), center outer area (Co), left edge outer area (Lo), etc.; As shown in Tables 3-5, a heat shield layer was formed by wrapping an aluminum sheet (thickness: 0.5 mm) around both ends of a cylindrical body (Cb) with a width of 75 mm (Example 2-1) or 100 mm (Example 2-2) to form a right overlapping outer region (OR) and a left overlapping outer region (OL), thereby creating a heating roller (Examples 2-1, 2-2). Alternatively, as shown in Table 5, a heating roller was created without wrapping an aluminum sheet around both ends of the cylindrical body (Cb) (Comparative Example 2-1). 【0110】 The infrared radiation source area (AI) was 650 mm. The infrared emissivity in the central outer region (Co) was 0.75, and the infrared emissivity on the inner surface of the cylinder (Cbi) was 0.89. Furthermore, the capacity density was 2.9 W / cm³. 2 That was the case. 【0111】 [Table 3] 【0112】 [Table 4] 【0113】 [Table 5] 【0114】 (Evaluation of the heated roller) As shown in Figure 4, in the heating rollers of Examples 2-1, 2-2, and Comparative Example 2-1, a pair of stainless steel circular ring supports (CSR, CSL) (outer diameter: 120 mm, inner diameter: 110 mm, width: 15 mm) were bolted to both ends of the regions (INR, INL) on the cylindrical surface (Cbo) where there was no heat insulating layer or heat shielding layer (HIR, HIL). By transmitting motor power to this pair of circular ring supports (CSR, CSL) via an endless belt, only the cylindrical body (Cb) constituting the heating roller was rotated at a peripheral speed of 200 mm / min. At the same time, power was supplied to an infrared radiation source to heat the surface of the outer central region (Cbo) of the heating roller (HR) to approximately 400°C, and the temperature distribution in the longitudinal direction of the outer central region (Co), that is, the region where sheet-like heat-treated materials such as fiber sheets can be processed, was measured. The results are shown in Figure 6. In Figure 6, the midpoint of the central outer region (Co) is defined as measurement position 0, and the temperatures on both sides of it are displayed. 【0115】 As is clear from Figure 6, the heating rollers (HR) of Examples 2-1 and 2-2, which have heat shielding layers (HIR, HIL) on the right and left overlapping outer regions of the cylindrical outer surface, exhibited minimal temperature drop at both ends and were able to uniformly heat-treat sheet-like materials. 【0116】 (Examples 3-1, 3-2, Comparative Example 3-1) A heating roller (HR) was fabricated as shown in Figure 1. 【0117】 (1) Cylindrical body (Cb); A radioactive aluminum cylindrical tube with a ring-shaped cross-section (inner diameter: 90 mm, outer diameter: 100 mm, wall thickness: 5 mm, length: 700 mm), where the outer surface of the pipe-shaped aluminum cylindrical tube is coated with heat-resistant paint and the inner surface is coated with heat-resistant infrared radiation paint (emissivity of the outer surface: 0.29, emissivity of the inner surface: 0.89). 【0118】 (2) Infrared radiation source (Sin); Six rod-shaped infrared heaters (outer diameter 8 mm, heating element length: 700 mm, 1050 W) are arranged concentrically around the axis of the cylindrical body (Cb) at equal 60° angles. Each of the six infrared heaters is positioned so that its midpoint coincides with the midpoint of the cylindrical body's length. 【0119】 (3) A pair of support plates (PSR, PSL); A pair of circular stainless steel plates (outer diameter: 85 mm, thickness: 5 mm) are arranged at 650 mm intervals, each having 12 through-holes (diameter: 8 mm) at equal 30° angles to the center, 58 mm from the center, through which an infrared heater or connecting shaft can be inserted. 【0120】 (4) A pair of internal insulation or internal heat shielding materials (IR, IL); A pair of circular stainless steel plates (outer diameter: 85 mm, thickness: 5 mm) are positioned 25 mm outside the pair of support plates (PSR, PSL), each having six through-holes (diameter: 8 mm) at equal 60° angles concentrically with respect to the center, 58 mm from the center, into which a connecting shaft can be inserted. 【0121】 (5) Heat-resistant insulating material; A circular inorganic insulation board (outer diameter: 85 mm, thickness: 25 mm) made of AES wool, amorphous silica, and silicon carbide is placed between a pair of support plates (PSR, PSL) and a pair of internal insulation materials or internal heat shielding materials (IR, IL). This board has 12 through holes (diameter: 8 mm) at a position 58 mm from the center, each at a constant angle of 30° to the center, allowing for the insertion of an infrared heater or connecting shaft. 【0122】 (6) Buffer tube (Ts); A buffer tube (with an emissivity of the outer surface of 0.88) is placed outside the infrared heater. This buffer tube is a 650mm long stainless steel pipe with an annular cross-section (inner diameter: 72.3mm, outer diameter: 76.3mm, wall thickness: 2mm) and both the outer and inner surfaces are fully coated with infrared radiation paint. 【0123】 (7) Composite shaft; The structure consists of a right shaft plate (SBR) and a left shaft plate (SBL), each composed of a circular disc made of stainless steel, with six circular recesses (diameter: 8mm) located 58mm from the center, each at a 60° angle concentrically with respect to the center; and a columnar shaft portion (outer diameter: 34mm) made of stainless steel protruding from the center of the disc. The structure is fixed in the recesses of the right shaft plate (SBR) and the left shaft plate (SBL), and consists of six stainless steel connecting shafts (Tin) (outer diameter: 8mm) that pass through holes in a pair of support plates (PSR, PSL), a heat-resistant insulation material, and a pair of internal insulation or internal heat shielding materials (IR, IL). 【0124】 The infrared radiation source (Sin) and the connecting shaft (Tin) pass through alternating through holes in the support plates (PSR, PSL), etc. In other words, the infrared radiation source (Sin) starts from a certain through hole X (0°) and passes through through holes at 60°, 120°, 180°, 240°, 300°, and 360°, while the connecting shaft starts from a certain through hole X (0°) and passes through through holes at 30°, 90°, 150°, 210°, 270°, and 330°. 【0125】 (8) Right edge outer area (Ro), center outer area (Co), left edge outer area (Lo), etc.; As shown in Table 6, a silica cloth tape was wrapped around both ends of a cylindrical body (Cb) with a width of 140 mm to form an insulating layer, creating a right overlapping outer region (OR) and a left overlapping outer region (OL), and this was used as a heating roller (Example 3-1). 【0126】 Furthermore, as shown in Table 7, a heat shield layer was formed by wrapping an aluminum sheet (thickness: 0.5 mm) around both ends of the cylindrical body (Cb) with a width of 150 mm to form a right overlapping outer region (OR) and a left overlapping outer region (OL), and this was used as a heating roller (Example 3-2). 【0127】 Furthermore, as shown in Table 8, a heating roller was constructed without wrapping either silica cloth tape or aluminum sheet around both ends of the cylindrical body (Cb) (Comparative Example 3-1). 【0128】 The infrared radiation source area (AI) was 650 mm. The infrared emissivity in the central outer region (Co) was 0.29, and the infrared emissivity on the inner surface of the cylinder (Cbi) was 0.89. Furthermore, the volume density was 2.9 W / cm³. 2 That was the case. 【0129】 [Table 6] 【0130】 [Table 7] 【0131】 [Table 8] 【0132】 (Evaluation of the heated roller) As shown in Figure 4, in the heating rollers of Examples 3-1, 3-2, and Comparative Example 3-1, a pair of stainless steel circular ring supports (CSR, CSL) (outer diameter: 120 mm, inner diameter: 110 mm, width: 15 mm) were bolted to both ends of the regions (INR, INL) on the cylindrical surface (Cbo) where there was no heat insulating layer or heat shielding layer (HIR, HIL). By transmitting motor power to this pair of circular ring supports (CSR, CSL) via an endless belt, only the cylindrical body (Cb) constituting the heating roller was rotated at a peripheral speed of 160 mm / min. At the same time, power was supplied to an infrared radiation source to heat the surface of the outer central region (Cbo) of the heating roller (HR) to approximately 410°C, and the temperature distribution in the longitudinal direction of the outer central region (Co), that is, the region where sheet-like heat-treated materials such as fiber sheets can be processed, was measured. The results are shown in Figure 7. In Figure 7, the midpoint of the central outer region (Co) is defined as measurement position 0, and the temperatures on both sides of it are displayed. 【0133】 As can be seen from Figure 7, the heating rollers (HR) of Examples 3-1 and 3-2, which have an insulating layer or heat shielding layer (HIR, HIL) on the right and left overlapping outer regions of the cylindrical outer surface, exhibited minimal temperature drop at both ends and were able to uniformly heat-treat sheet-like materials. 【0134】 (Examples 4-1, 4-2, Comparative Examples 4-1, 4-2) A heating roller (HR) was fabricated as shown in Figure 1. 【0135】 (1) Cylindrical body (Cb); Alumina SSA-S cylindrical tube with an annular cross-section (inner diameter: 85 mm, outer diameter: 100 mm, wall thickness: 7.5 mm) (length: 1000 mm, emissivity of outer surface: 0.74, emissivity of inner surface: 0.81). 【0136】 (2) Infrared radiation source (Sin); Six rod-shaped infrared heaters (outer diameter: 8 mm, heating element length: 700 mm, 1050 W) are arranged concentrically around the axis of the cylindrical body (Cb) at equal 60° angles. Each of the six infrared heaters is positioned so that its midpoint coincides with the midpoint of the cylindrical body's length. 【0137】 (3) A pair of support plates (PSR, PSL); A pair of circular stainless steel plates (outer diameter: 82 mm, thickness: 5 mm) are arranged at 650 mm intervals, each equipped with 12 through-holes (diameter: 8 mm) at equal 30° angles relative to the center, 58 mm from the center, through which an infrared heater or connecting shaft can be inserted. 【0138】 (4) A pair of internal insulation or internal heat shielding materials (IR, IL); A pair of circular stainless steel plates (outer diameter: 82 mm, thickness: 5 mm) are positioned 25 mm outside the pair of support plates (PSR, PSL), each having six through-holes (diameter: 8 mm) at equal 60° angles concentrically with respect to the center, 58 mm from the center, into which a connecting shaft can be inserted. 【0139】 (5) Heat-resistant insulating material; A circular inorganic insulation board (outer diameter: 82 mm, thickness: 25 mm) made of AES wool, amorphous silica, and silicon carbide is placed between a pair of support plates (PSR, PSL) and a pair of internal insulation materials or internal heat shielding materials (IR, IL). This board has 12 through holes (diameter: 8 mm) at a position 58 mm from the center, each at a constant angle of 30° to the center, allowing for the insertion of an infrared heater or connecting shaft. 【0140】 (6) Buffer tube (Ts); A buffer tube (with an emissivity of the outer surface of 0.88) is placed outside the infrared heater. This buffer tube is a 650mm long stainless steel pipe with an annular cross-section (inner diameter: 72.3mm, outer diameter: 76.3mm, wall thickness: 2mm) and both the outer and inner surfaces are fully coated with infrared radiation paint. 【0141】 (7) Composite shaft; The structure consists of a right shaft plate (SBR) and a left shaft plate (SBL), each composed of a circular disc made of stainless steel, with six circular recesses (diameter: 8mm) located 58mm from the center, concentrically arranged at 60° angles to the center, into which connecting shafts can be fitted; and a columnar shaft portion (outer diameter: 34mm) made of stainless steel protruding from the center of the disc. The structure is fixed in the recesses of the right shaft plate (SBR) and the left shaft plate (SBL), and consists of six stainless steel connecting shafts (Tin) (outer diameter: 8mm) that pass through holes in a pair of support plates (PSR, PSL), heat-resistant insulation material, and a pair of internal insulation material or internal heat shielding material (IR, IL). 【0142】 The infrared radiation source (Sin) and the connecting shaft (Tin) pass through alternating through holes in the support plates (PSR, PSL), etc. In other words, the infrared radiation source (Sin) starts from a certain through hole X (0°) and passes through through holes at 60°, 120°, 180°, 240°, 300°, and 360°, while the connecting shaft starts from a certain through hole X (0°) and passes through through holes at 30°, 90°, 150°, 210°, 270°, and 330°. 【0143】 (8) Right edge outer area (Ro), center outer area (Co), left edge outer area (Lo), etc.; As shown in Table 9, a 100 mm wide silica cloth tape was wrapped around both ends of a cylindrical body (Cb) to form a heat insulating layer, creating a right overlapping outer region (OR) and a left overlapping outer region (OL), and this was used as a heating roller (Example 4-1). 【0144】 Furthermore, as shown in Table 10, a heat shield layer was formed by wrapping an aluminum sheet (thickness: 0.5 mm) with a width of 100 mm around both ends of the cylindrical body (Cb) to form a right overlapping outer region (OR) and a left overlapping outer region (OL), and this was used as a heating roller (Example 4-2). 【0145】 Furthermore, as shown in Table 11, a heat insulating layer was formed by wrapping silica cloth tape with a width of 100 mm around both ends of the cylindrical body (Cb) without forming the right overlapping outer region (OR) and the left overlapping outer region (OL), and this was used as a heating roller (Comparative Example 4-1). 【0146】 Furthermore, as shown in Table 12, a heating roller was constructed without wrapping either silica cloth tape or aluminum sheet around both ends of the cylindrical body (Cb) (Comparative Example 4-2). 【0147】 The infrared radiation source area (AI) was 650 mm. The infrared emissivity in the central outer region (Co) was 0.74, and the infrared emissivity on the inner surface of the cylinder (Cbi) was 0.81. Furthermore, the capacity density was 2.9 W / cm³. 2 That was the case. 【0148】 [Table 9] 【0149】 [Table 10] 【0150】 [Table 11] 【0151】 [Table 12] 【0152】 (Evaluation of the heated roller) As shown in Figure 4, in the heating rollers of Examples 4-1, 4-2, and Comparative Examples 4-1, 4-2, a pair of stainless steel circular ring supports (CSR, CSL) (outer diameter: 120 mm, inner diameter: 110 mm, width: 15 mm) were bolted to both ends of the regions (INR, INL) on the cylindrical surface (Cbo) where there was no heat insulating layer or heat shielding layer (HIR, HIL). By transmitting motor power to this pair of circular ring supports (CSR, CSL) via an endless belt, only the cylindrical body (Cb) constituting the heating roller was rotated at a peripheral speed of 160 mm / min. At the same time, power was supplied to an infrared radiation source to heat the surface of the outer central region (Cbo) of the heating roller (HR) to approximately 400°C, and the temperature distribution in the longitudinal direction of the outer central region (Co), that is, the region where sheet-like heat-treated materials such as fiber sheets can be processed, was measured. The results are shown in Figure 8. In Figure 8, the midpoint of the central outer region (Co) is defined as measurement position 0, and the temperatures on both sides of it are displayed. 【0153】 As can be seen from Figure 8, a comparison between the heating rollers (HR) of Examples 4-1 and 4-2, which have an insulating layer or heat shielding layer (HIR, HIL) in the right and left overlapping outer regions of the cylindrical outer surface, and Comparative Example 4-1, which does not have an insulating layer or heat shielding layer (HIR, HIL) in the right and left overlapping outer regions, shows that even with an insulating layer or heat shielding layer, if the right and left overlapping outer regions do not have an insulating layer or heat shielding layer, the temperature drop at both ends is large, and the sheet-like material to be heat-treated cannot be uniformly heat-treated. 【0154】 From the above examples, it was found that the infrared emissivity of the central outer region (Co) of the cylindrical outer surface (Cbo) is 0.29 to 0.81, which facilitates uniform heating along the entire length of the heating roller. 【0155】 Furthermore, from the above examples, it was found that when the infrared emissivity in the central outer region (Co) is the same as or less than the infrared emissivity in the inner surface of the cylindrical body (Cbi), uniform heating can be achieved along the entire length of the heating roller, and heat treatment can be performed at high temperatures of 350°C or higher, especially 400°C or higher. 【0156】 Furthermore, from the above examples, it was found that if the infrared emissivity on the inner surface (Cbi) of the cylindrical body is 0.7 or higher, heat treatment can be performed at high temperatures of 350°C or higher, and especially 400°C or higher. [Industrial applicability] 【0157】 The heating roller of the present invention can heat uniformly throughout its entire length, and therefore can be used as a heating roller for various sheet-like materials to be heat-treated. In particular, even fiber sheets containing liquids such as dispersion media or solvents, such as electrospun nonwoven fabrics and wet nonwoven fabrics, low-basis-weight fiber sheets, or low-strength fiber sheets can be heat-treated uniformly without causing wrinkles in the fiber sheet. Furthermore, since the heating roller of the present invention can uniformly heat sheet-like materials to be heat-treated at high temperatures of 350°C or higher (especially high temperatures of 400°C or higher), it can be used to heat-treat fiber sheet constituent resins (for example, high-heat-resistant resins such as polyimide resins, polyamide-imide resins, and polybenzimidazole resins) at high temperatures. However, the heating roller of the present invention can also heat uniformly at temperatures below 350°C, such as 250°C and 300°C, making it highly versatile. [Explanation of Symbols] 【0158】 HR Heat Roller Ro right side outer area Lo Left side outer area Co central outer area HIR, HIL insulation layer or heat shield layer NR Right non-overlapping outer region NL Left non-overlapping outer region OR right side overlap outer area OL left overlap outer area AI infrared radiation source action part Areas where INR, INL insulation or heat shielding layers are absent. Cb cylinder Cbo cylindrical outer surface Cbi cylindrical inner surface Si1, Si2, Si3, Sin Infrared radiation source Projected images of the Pd1, Pd2, and Pd3 infrared radiation source working parts onto the outer surface of the cylindrical body. PSR, PSL support plate IR, IL: Internal insulation or internal heat shielding material Ts buffer tube SBR Right Shaft Plate SBL Left Shaft Plate Ti1, Ti2, Ti3, Ti4, Tin connecting shaft CSR, CSL circular ring support

Claims

[Claim 1] A cylindrical body and An infrared radiation source located inside the cylindrical body and extending in the longitudinal direction of the cylindrical body, A heating roller equipped with, The outer surface of the cylindrical body has a right-side outer region including a right-side overlapping outer region that overlaps with the vicinity of the right-side end of the projected image obtained by projecting the infrared radiation source working part onto the outer surface of the cylindrical body, a left-side outer region including a left-side overlapping outer region that overlaps with the vicinity of the left-side end of the projected image obtained by projecting the infrared radiation source working part onto the outer surface of the cylindrical body, and a central outer region between the right-side outer region and the left-side outer region. A heating roller characterized by having an insulating layer or a heat-shielding layer in the right overlapping outer region and the left overlapping outer region of the outer surface of the cylindrical body. [Claim 2] The heating roller according to claim 1, characterized in that the length of the right overlapping outer region and the length of the left overlapping outer region on the outer surface of the cylindrical body are both 5 mm or more. [Claim 3] The heating roller according to claim 1, characterized in that the infrared emissivity in the central outer region of the outer surface of the cylindrical body is 0.29 to 0.

81. [Claim 4] The heating roller according to claim 1, characterized in that the infrared emissivity in the central outer region of the outer surface of the cylindrical body is the same as or less than the infrared emissivity on the inner surface of the cylindrical body. [Claim 5] The heating roller according to claim 4, characterized in that the infrared emissivity on the inner surface of the cylindrical body is 0.7 or more. [Claim 6] The volume density of the central outer region of the outer surface of the cylindrical body is 1.0 W / cm². ２ The heating roller according to claim 1, characterized in that it is as described above.

Images