JP5800832B2 - Jacket heater and heating method using jacket heater - Google Patents

Description

  The present invention relates to a jacket heater mounted on a pipe or the like and a heating method using the jacket heater, and more particularly to a method for suppressing heat dissipation from the jacket heater and increasing heating efficiency to save power.

  Conventionally, in order to heat an object to be heated such as various devices and equipment and piping connected thereto, the piping is surrounded by a jacket heater having flexibility. In addition, when a curved surface such as a side surface of the apparatus is kept warm or heated, a similar jacket heater is attached. Such a jacket heater is also called a mantle heater.

  As such a jacket heater, a mantle heater 10 as shown in FIG. 10 is known, and the present applicant also discloses a patent document 1 between an inner layer material 100 and an outer layer material 200 made of a fluororesin sheet. A mantle heater 10 is proposed in which a heating element 300 having a heating wire (not shown) attached to an inorganic fiber sheet 303 and a heat insulating material 400 are stacked to form a laminated shape. The heating wire is a heating wire, and a power line 306 leading to the outside of the inner layer material 100 and the outer layer material 200 is connected, and power is supplied by connecting the outlet 307 to an external power source (not shown). When the mantle heater 10 is attached to the straight pipe 20, both peripheral edges 103 and 104 in the longitudinal direction are abutted and joined by hook-and-loop fasteners 105 and 106 attached to the end faces.

  Such a mantle heater 10 has an advantage that it can be used in a clean room or the like because it has flexibility and also generates little dust.

Japanese Laid-Open Patent Publication No. 2002-295883

  However, the mantle heater 10 has the outer layer material 200 exposed in the mounted state, and it is inevitable that heat is dissipated through the outer layer material 200 even if the heat insulating material 400 is incorporated. Accordingly, an object of the present invention is to suppress heat dissipation from the jacket heater.

In order to achieve the above object, the present invention provides the following jacket heater and a heating method using the jacket heater.
(1) It has a surrounding body composed of an inner layer material and an outer layer material, a heating element and a heat insulating material surrounded by the inner layer material and the outer layer material, so that the heated body and the inner layer material are in contact with each other. In the jacket heater attached to the heated object,
A jacket heater in which at least the outer layer material of the enclosure is a fluororesin sheet, a fluororesin fiber cloth, or a fluororesin coated inorganic fiber cloth, and a metal layer is formed on an outer peripheral surface of the outer layer material.
(2) The jacket heater according to (1), wherein the metal layer is a metal foil.
(3) The jacket heater as described in said (1) whose said metal layer is a metal vapor deposition film.
(4) The jacket heater according to (1), wherein the metal layer is a metal coating film.
(5) It has a surrounding body composed of an inner layer material and an outer layer material, a heating element and a heat insulating material surrounded by the inner layer material and the outer layer material, and at least the outer layer material of the surrounding body is a fluororesin A heating method using a jacket heater which is a sheet made of cloth, a cloth made of fluororesin fiber or a cloth made of fluororesin coated inorganic fiber, and is attached to the heated body so that the heated body and the inner layer material are in contact with each other,
A heating method using a jacket heater, which includes a step of surrounding the outer layer material with a metal foil after the jacket heater is mounted on a heated object.
(6) In the step of surrounding the outer layer material with a metal foil, the metal foil is a metal foil having a plurality of protrusions on at least one surface, and the outer layer material is made of the metal foil so that the protrusions are on the outer layer material side. A heating method using the jacket heater according to the above (5).
(7) In the step of surrounding the outer layer material with the metal foil, the metal foil is a metal foil in which a foam layer having an open cell structure is formed on at least one surface, and the foam layer is on the outer layer material side. The heating method using the jacket heater according to (5), wherein the outer layer material is surrounded by the metal foil.
(8) An envelope including an inner layer material and an outer layer material, a heating element and a heat insulating material surrounded by the inner layer material and the outer layer material, and at least the outer layer material of the envelope being a fluororesin A heating method using a jacket heater which is a sheet made of cloth, a cloth made of fluororesin fiber or a cloth made of fluororesin coated inorganic fiber, and is attached to the heated body so that the heated body and the inner layer material are in contact with each other,
A heating method using a jacket heater, which includes a step of applying a coating material containing a metal powder to an outer peripheral surface of an outer layer material after the jacket heater is mounted on a heated body, and drying.

  According to the present invention, since the outer peripheral surface of the outer layer material of the jacket heater is surrounded by the metal layer, the heat rays emitted from the outer layer material are reflected by the metal layer and enter the jacket heater. Therefore, heat radiation from the jacket heater is greatly reduced, resulting in power saving. Moreover, since the surface is a metal layer, it is possible to prevent the generation of outgas, which is suitable for heating a pipe that requires a clean environment such as a semiconductor manufacturing apparatus.

FIG. 1 is a perspective view showing an embodiment of a jacket heater according to the present invention. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a perspective view showing a construction method of the jacket heater according to the present invention. FIG. 4 is a cross-sectional view showing an example of a metal foil used in the present invention. FIG. 5 is a cross-sectional view showing another example of the metal foil. FIG. 6 is a schematic diagram for explaining the test method of Test 1. FIG. FIG. 7 is a graph showing the results of Test 1. FIG. 8 is a schematic diagram for explaining the test method of Test 2. FIG. FIG. 9 is a graph showing the results of Test 2. FIG. 10 is a perspective view showing a conventional jacket heater.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an example of a jacket heater according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. The overall structure of the jacket heater 10 is the same as that shown in FIG. 10, and a heating wire (heating wire) 302 is provided on the inorganic fiber sheet 303 between the inner layer material 100 and the outer layer material 200 as an enclosure. In the present invention, the metal layer 1 is further formed on the outer peripheral surface of the outer layer material 200. The heating element 300 and the heat insulating material 400 are laminated. Examples of the metal layer 1 include a metal foil, a metal vapor deposition film, and a metal coating film. Although there is no restriction | limiting in the material of each of these members, For example, the following can be used.

  The inner layer material 100 and the outer layer material 200 are, for example, PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene-perfluoroalkoxyethylene copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PCTFE. (Polychlorotrifluoroethylene), ETFE (tetrafluoroethylene-ethylene copolymer), ECTFE (chlorotrifluoroethylene-ethylene copolymer), PVDF (polyvinylidene fluoride) and other fluororesins made of fluororesin Sheet or cloth made of fluororesin fibers (woven cloth) knitted with the above-mentioned fluororesin fibers, cloth made of inorganic fibers such as glass fibers, silica fibers, alumina fibers, silica alumina fibers (woven cloth), These inorganic fiber products The fluorine-based fluororesin coating inorganic fibers made cloth The resin was coated can be used to scan.

  Further, as the inner layer material 100 and the outer layer material 200, in addition to the fluororesin, polyamide, polycarbonate, polyacetal, polybutylene terephthalate, modified polyphenylene ether, polyphenylene sulfide, polysulfone, polyethersulfone, polyarylate, polyetherether kelton, Although it is heat resistant, such as polyphthalemide, polyimide, polyetherimide, polymethylpen, etc., a resin having a lower melting point than that of a fluororesin can also be used.

  The thickness of such an enclosure is not particularly limited as long as the effects of the present invention can be obtained, but 0.1 to 8 mm is appropriate, 0.1 to 5 mm is preferable, and 0.1 to 2 mm is more preferable. It is.

  The heating element 300 may have a heating wire 302 such as a nichrome wire or a stainless wire that generates heat when energized. Such a heating wire 302 is preferably electrically insulated. Such insulation is performed by covering an inorganic fiber sleeve 301 made of glass fibers, inorganic fibers such as silica fibers, alumina fibers, or silica alumina fibers, or by coating a resin. Instead of the heating wire 302, a carbon heating element or a ceramic heating element may be used. In addition, a power line 306 is connected to the heating wire 302, and power is supplied by connecting the outlet 307 to an external power source (not shown).

  Such a heating wire 302 may be sewn to the support (inorganic fiber sheet) 303 with a sewing thread 304 in a desired pattern. As such a support (inorganic fiber sheet) 303, for example, an inorganic fiber cloth made of inorganic fibers such as glass fibers, silica fibers, alumina fibers, and silica alumina fibers can be used.

  As the heat insulating material 400, an inorganic fiber mat in which glass fibers, ceramic fibers, silica fibers, and the like are assembled and subjected to needle processing can be used. Further, it may be formed into a mat shape with an inorganic binder such as colloidal silica, alumina sol or sodium silicate, or an organic binder such as starch. Alternatively, a porous molded body made of a heat-resistant organic resin such as aramid, polyamide, or polyimide can be used. 5-100 mm is suitable for the thickness of such a heat insulating material, 5-50 mm is suitable, and 8-30 mm is still more suitable. In the jacket heater of the present invention, a heat insulating material is not essential and can be omitted.

  In addition to the materials described above, a fiber body (aerogel fiber body) filled with airgel can be used as the heat insulating material. Such an airgel fiber body is a heat insulating material in which a fiber base material is filled with airgel.

  Examples of the fiber base material constituting the airgel fiber body include organic fibers such as polyethylene terephthalate (PET) fibers, carbon fibers, glass fibers, aluminosilicate fibers, silica fibers, fibers made of inorganic fibers such as mullite fibers and alumina fibers. A substrate can be used, and a fiber substrate made of inorganic fibers having excellent heat resistance can be preferably used.

  That is, as the fiber base material, an inorganic fiber woven fabric or non-woven fabric can be preferably used. Here, as the non-woven fabric, for example, a paper-like material obtained by making an inorganic fiber with a paper-making machine, a blanket obtained by processing the collected inorganic fiber into a mat shape, or an inorganic binder with an organic binder. In addition, a felt mat or the like formed into a mat shape can be used. By using a nonwoven fabric in which inorganic fibers are randomly oriented as the fiber substrate, the airgel can be effectively held between the inorganic fibers of the fiber substrate.

  In addition, as an inorganic fiber constituting the fiber base material, for example, when the jacket heater of the present invention is used in an environment where heat resistance is not so required, such as less than 100 ° C., the airgel fiber body has excellent flexibility. Organic fibers such as PET fibers that can be imparted with water can be preferably used. In addition, for example, when the jacket heater of the present invention is used in an environment where a certain degree of heat resistance is required, such as 100 to 250 ° C., an inexpensive glass fiber can be preferably used. In addition, for example, when the jacket heater of the present invention is used in an environment where high heat resistance exceeding 250 ° C. is required, aluminosilicate fiber, silica fiber, mullite fiber, alumina fiber, etc. having high heat resistance These ceramic fibers can be preferably used.

  As the airgel, for example, an airgel made of an inorganic material (inorganic airgel) or an airgel made of an organic material (organic airgel) can be used, and an inorganic airgel excellent in heat resistance can be preferably used. As the inorganic airgel, for example, silica airgel or alumina airgel can be used. In particular, by using silica airgel, the heat insulation property of the airgel fiber body can be effectively enhanced.

  Therefore, as an airgel fiber body, what filled the inorganic airgel in the nonwoven fabric of the inorganic fiber can be used preferably. Specifically, for example, an airgel fiber body in which a silica fiber non-woven fabric is filled with silica airgel, or an airgel fiber body in which a glass fiber mat is filled with silica airgel can be preferably used. As such an airgel fiber body, for example, products such as “SCAPELOFT2200”, “SCAPELOFT2250”, “Pyrogel6650”, and “PyrogelXT” are available from Aspen Aerogels Inc.

The ratio of the airgel and the fiber base contained in the airgel fiber body should be set as appropriate according to the characteristics (for example, heat insulation, heat resistance, low dust generation, flexibility) that the airgel fiber body should have. Can do. The density of an airgel fiber body can be made into the range of 20-500 kg / m < ³ >, for example, Preferably it can be set as the range of 100-300 kg / m < ³ >.

  Such an airgel fiber body has excellent heat insulating properties because air convection in the airgel fiber body is effectively prevented by the micropores in the airgel filling the voids between the fibers.

  Specifically, the thermal conductivity of the airgel fiber body at 25 ° C. can be, for example, 0.024 W / m · K or less, preferably 0.020 W / m · K or less, and more preferably. May be 0.018 W / m · K or less.

  The thermal conductivity of the airgel fiber body at 80 ° C. can be, for example, 0.035 W / m · K or less, preferably 0.027 W / m · K or less, more preferably 0. 0.025 W / m · K or less.

  Thus, since an airgel fiber body has the outstanding heat insulation, it can reduce in thickness, maintaining sufficient heat insulation. Specifically, the thickness of the airgel fiber body can be, for example, in the range of 1 to 50 mm, preferably in the range of 1 to 25 mm, and more preferably in the range of 1 to 15 mm. it can. By reducing the thickness of the heat insulating material, the flexibility of the jacket heater of the present invention can be improved, and the thickness of the jacket heater can be reduced, contributing to space saving.

  As the metal layer 1, a metal foil, a metal vapor deposition film, or a metal coating film is preferable.

  The metal foil for forming the metal layer 1 is preferably an aluminum foil because it is inexpensive, but other metals such as copper and stainless steel may be used. For joining to the outer layer material 200, an adhesive capable of adhering metal may be used, or heat fusion may be performed. For applications where external contamination due to outgas generation is a problem, it is preferable to use heat fusion.

  Moreover, what is necessary is just to vapor-deposit the same metal as the case of metal foil, when forming a metal vapor deposition film. In order to form a metal coating film, a general metal paint containing a metal powder similar to that in the case of a metal foil may be applied using a brush or spray and dried.

  If the thickness of the metal layer 1 is too thin, the metal layer 1 may be broken. If the thickness is too thick, the flexibility is impaired and the cost increases, so 20 μm to 5 mm is appropriate, and 30 to 100 μm is preferable. And 40 to 70 μm is more preferable.

  In order to cover the jacket heater 10 on the pipe 20 as described above, after the gap between the peripheral edge portions 103 and 104 is widened and attached to the pipe 20, the peripheral edge portions 103 and 104 are brought into contact with each other. For example, it can be fixed via the hook-and-loop fasteners 105 and 106 at the end faces. In place of the hook-and-loop fasteners 105 and 106, a known fixing means such as a hook or a buckle, belts or the like can be used.

  According to the jacket heater of the present invention, since the heat rays radiated from the outer layer material 200 of the jacket heater 10 are reflected by the metal layer 1 and enter the jacket heater 10 by the metal layer 1, the heat radiation from the jacket heater 10 is greatly increased. Can be reduced.

  In addition, the jacket heater 10 can be formed in a curved shape or an L shape so that the jacket heater 10 can be attached to a bent tube or an L-shaped tube in addition to a cylindrical shape so as to be mounted on the straight pipe 20. When the object to be heated has a square case shape, it can be formed in a box shape or a plate shape.

  In the above, the jacket heater 10 in which the metal layer 1 is formed on the outer layer material 200 is shown. However, as shown in FIG. 3, the existing jacket heater 10 without the metal layer 1 is used and the outer layer is mounted on the pipe 20. Even if the outer peripheral surface of the material 200 is surrounded by a metal layer such as the metal foil 30, the same heat dissipation suppression effect can be obtained.

  The surrounding method using the metal foil 30 is preferable because the method of winding the metal foil 30 around the jacket heater 10 can easily cope with various jacket heaters 10 having different lengths and is simple. In addition, when winding the metal foil 30, the edge 30a of adjacent metal foil is overlapped and wound so that the outer layer material 200 may not be exposed.

  Examples of the metal foil 30 include aluminum foil, copper foil, and stainless steel foil as described above, and the thickness thereof may be the same as described above.

  Further, when the metal foil 30 is wound, a minute gap may be naturally formed between the outer layer material 200, but since the minute gap is an air layer, a heat insulating and heat retaining effect is also added. However, depending on how the metal foil 30 is wound, there may be a portion where the metal foil 30 and the outer layer material 200 are in partial contact and a minute gap is not formed. Therefore, as shown in FIG. 4, it is preferable that the protrusions 31 are scattered on the surface of the metal foil 30 on the outer layer material side. In addition, although there is no restriction | limiting in the height, pitch (protrusion space | interval), etc. of the processus | protrusion 31, A height is 0.5-2.0 mm and a pitch is 5-20 mm. The protrusion 31 can reliably form a minute gap between the metal foil 30 and the outer layer material 200. That is, after the jacket heater is mounted on a heated object such as a pipe, the outer layer material of the jacket heater is surrounded by a metal foil having a plurality of protrusions on at least one surface so that the protrusion is on the outer layer material side. preferable.

  In order to reliably form a minute gap between the metal foil 30 and the outer layer material 200, a foam layer 35 having an open cell structure may be bonded to the surface of the metal foil 30 on the outer layer material side as shown in FIG. . In addition to open-cell foams with continuous air bubbles, there are closed-cell foams that are interspersed with individual bubbles and foams that contain both open and closed cells. It is preferable to form the foam layer 35 with a foam having an open-cell structure so that the heat rays from the material 200 reach the metal foil 30 directly. That is, after the jacket heater is mounted on a heated object such as a pipe, the outer layer material of the jacket heater is made to be the outer layer material side by a metal foil in which a foam layer having an open cell structure is formed on at least one surface. It is preferable to surround them.

  Further, the foam layer 35 has a heat insulation and heat insulation effect by the air layer as the bubble volume increases, and the heat rays from the outer layer material 200 easily reach the metal foil 30, so that the porosity is 60% or more. Is preferable, and 80% or more is more preferable.

  There is no restriction | limiting in the material of the foaming layer 35, Since heat resistance is not especially requested | required, it can be made from various resin, and since it is cheap, a urethane foam is suitable. The thickness of the foam layer 35 is suitably 0.5 to 2.0 mm.

  In addition, when joining the metal foil 30 and the foam layer 35, what is necessary is just to use the adhesive agent which can adhere | attach a metal, or to heat-seal | fuse. For applications where external contamination due to outgas generation is a problem, it is preferable to use heat fusion.

  The metal foil 30 provided with the metal foil 30 or the foamed layer 35 and the jacket heater 10 are joined to the belt heater 10 after the metal foil 30 or the metal foil 30 provided with the foamed layer 35 is wound around the jacket heater 10. The mounting state can be maintained using a fixing means such as the above. Alternatively, an adhesive layer may be formed on the back surface (surface on the outer layer material side) of the metal foil 30 or the foamed layer 35 and adhered to the outer peripheral surface of the outer layer material 200. Or you may adhere the metal foil 30 provided with the metal foil 30 or the foaming layer 35 on the outer peripheral surface of the outer layer material 200 using a double-sided adhesive tape.

  Further, instead of the metal foil 30, the existing jacket heater 10 is mounted on a heated object such as the pipe 20, and then a metal paint is applied to the outer surface of the outer layer material 200 and dried to form a metal coating film. May be.

  The jacket heater of the present invention can be heated with power saving, and the power saving performance is particularly effective in heating at a high temperature of 100 ° C. or higher, preferably 150 ° C. or higher, as shown in the examples described later. Moreover, since the surface is the metal layer 1, generation | occurrence | production of outgas can also be prevented and it becomes suitable for heating to-be-heated bodies, such as piping with which clean environments, such as a semiconductor manufacturing apparatus, are requested | required.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and demonstrated further regarding this invention, this invention is not restrict | limited at all by this.

[Test 1]
<Example 1>
“Pyrogel” manufactured by Nippon Aerosil Co., Ltd. having a thickness of 3 mm was prepared as a heat insulating material, and a heat insulating material A in which an aluminum foil having a thickness of 0.2 mm was adhered to one surface thereof with an adhesive was prepared.

<Example 2>
“Pyrogel” manufactured by Nippon Aerosil Co., Ltd. having a thickness of 3 mm was prepared as a heat insulating material, and a heat insulating material B in which a stainless steel foil having a thickness of 0.1 mm was adhered to one surface thereof with an adhesive was prepared.

(Comparative Example 1)
A heat insulating material C made of only a heat insulating material having a thickness of 3 mm (“Pyrogel” manufactured by Nippon Aerosil Co., Ltd.) was produced.

(Comparative Example 2)
A heat insulating material D made only of a 6 mm thick heat insulating material (“Pyrogel” manufactured by Nippon Aerosil Co., Ltd.) was produced.

Then, as shown in FIG. 6, the heat insulating materials A to D of Example 1, Example 2, Comparative Example 1 or Comparative Example 2 are placed on a hot plate as shown in FIG. , The heat insulating material is placed in contact with the hot plate), and the input power required to maintain the hot plate at 50 ° C., 100 ° C., 150 ° C., 200 ° C. or 250 ° C. is measured. The theoretical power amount was calculated from the calculated power correction formula. In addition, there is actually a heat quantity (heat loss Q _L ) other than the electric power input to heat the heat insulating material, and as shown in the figure, the surface area of the heat insulating material is narrower than the surface area of the hot plate. In addition to the amount of heat from the plate being transferred to the heat insulating material, there is an amount of heat radiated into the air (Q _loss ), an amount of heat transmitted through the heat insulating material (Q _T ), and an amount of heat reflected from the heat insulating material (Q _R ). Therefore, the actual input power Q _S is the sum of the amount of heat Q _W and heat loss Q _L for heating the heat insulating material. Therefore, the theoretical power amount was calculated by the following power correction formula.
Q _S = Q _W + Q _L
Q _W = [(T _o −T ₁ ) / D × λ × S] −Q _L
Q _L = Q _loss + Q _T + Q _R
In the formula, T ₀ : surface temperature of hot plate (° C.), T ₁ : surface temperature of heat insulating material opposite to hot plate (° C.), D: thickness of heat insulating material (m), λ: heat of heat insulating material Conductivity (W / m ² · K), S: area (m ² ) of the surface of the heat insulating material on the side in contact with the hot plate. Further, Q _T = Q _R = 0 and S is 0.0289 m ² . The temperature was measured by arranging thermocouples, and the arrangement points were set at five locations in the vicinity of the four corners and the center, and the average value was taken as the measurement value.

  FIG. 7 shows the calculation results of the theoretical electric energy. The heat insulating material A of Example 1 and the heat insulating material B of Example 2 are almost equivalent to the heat insulating material D of Comparative Example 2 in which the thickness of the heat insulating material is doubled to 6 mm. It can be seen that the input power is sufficient. In other words, by adhering metal foil (aluminum foil or stainless steel foil) according to the present invention, the thickness of the heat insulating material can be halved, and the material cost can also be halved. Such an effect is remarkable in heating at a high temperature of 100 ° C. or higher.

[Test 2]
The amount of heat dissipated from the surface of the heat insulating material Q is the sum of surface heat transfer by convection and surface heat transfer by radiation, and can be obtained from the following equation.
Q = α _c (T _s −T _∞ ) + α _r (T _s −T _∞ )
Here, α _c (T _s −T _∞ ) is the amount of surface heat transfer due to convection, and α _r (T _s −T _∞ ) is the amount of surface heat transfer due to radiation, and is expressed below.
α _c = A × 3.26 × (T _s −T _∞ ) ^0.25 × {(w + 0.348) / (0.348)} ^0.5
α _r = A × ε × σ × (T _s ⁴ −T _∞ ⁴ ) / (T _s −T _∞ )
In the formula, A is the surface area (m ² ), T _s is the surface temperature (K) opposite to the hot plate of the heat insulating material, T _∞ is room temperature (K), and α _c is the surface heat transfer coefficient by convection (W / m) ² · K), α _r is the surface heat transfer coefficient by radiation (W / m ² · K), ε is the emissivity, w is the wind speed (m / s), and σ is the Stefan-Boltzmann constant (5.67 × 10 ^{− 8} W / m ² · K). For example, JIS A 9501: 2006 can be referred to for the above.

Therefore, the heat insulating material A of Example 1 or the heat insulating material C of Comparative Example 1 (both surface area A is 0.0289 m ² ) is placed on the hot plate as shown in FIG. Heating was maintained at 100 ° C., 150 ° C., 200 ° C. or 250 ° C., and at each temperature, the interface temperature between the heat insulating material and the hot plate and the surface temperature of the heat insulating material opposite to the hot plate were measured. The temperature of the interface and the surface was measured by arranging thermocouples, and the arrangement points were set at five locations in the vicinity of the four corners and the center, and the average value was taken as the measurement value. The emissivity on the surface of the heat insulating material was measured with a radiation thermometer. And the amount of surface heat transfer by the convection by the convection and the amount of surface heat transfer by the radiation were calculated from the above formula.

  The calculation result of the amount of heat dissipated is shown in FIG. 9. By bonding the aluminum foil, the surface heat transfer amount due to radiation decreases and the surface heat transfer amount due to convection increases, but the amount of surface heat transfer due to radiation increases. Since the decrease is larger than the increase in the amount of surface heat transfer due to convection, the input power amount is reduced as a whole. Such an effect is remarkable in heating at a high temperature of 100 ° C. or higher.

Although the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2010-271611 filed on Dec. 6, 2010, the contents of which are incorporated herein by reference. Moreover, all the content of the literature described in the specification is also taken in as a reference.

1 Metal layer 10 Jacket heater (mantle heater)
30 Metal foil 31 Projection 35 Foamed layer 100 Inner layer material 200 Outer layer material 300 Heating element 400 Heat insulating material

Claims (8)

An enveloping body made of an inner layer material and an outer layer material, a heating element surrounded by the inner layer material and the outer layer material, and a heat insulating material, and the heated object so that the heated object and the inner layer material are in contact with each other In the jacket heater attached to
A jacket heater in which at least the outer layer material of the enclosure is a fluororesin sheet, a fluororesin fiber cloth, or a fluororesin coated inorganic fiber cloth, and a metal layer is formed on an outer peripheral surface of the outer layer material.   The jacket heater according to claim 1, wherein the metal layer is a metal foil.   The jacket heater of Claim 1 whose said metal layer is a metal vapor deposition film.   The jacket heater according to claim 1, wherein the metal layer is a metal coating film. An envelope composed of an inner layer material and an outer layer material, a heating element and a heat insulating material surrounded by the inner layer material and the outer layer material, and at least the outer layer material of the envelope is a fluororesin sheet, Fluorine resin fiber cloth or fluororesin coated inorganic fiber cloth, a heating method using a jacket heater attached to the heated body so that the heated body and the inner layer material are in contact with each other,
A heating method using a jacket heater, which includes a step of surrounding the outer layer material with a metal foil after the jacket heater is mounted on a heated object.   In the step of surrounding the outer layer material with the metal foil, the metal foil is a metal foil having a plurality of protrusions on at least one surface, and the outer layer material is surrounded by the metal foil so that the protrusions are on the outer layer material side. A heating method using the jacket heater according to claim 5.   In the step of surrounding the outer layer material with the metal foil, the metal foil is a metal foil in which a foam layer having an open-cell structure is formed on at least one surface, and the metal foil so that the foam layer is on the outer layer material side. The heating method using the jacket heater according to claim 5, wherein the outer layer material is surrounded by the step. An envelope composed of an inner layer material and an outer layer material, a heating element and a heat insulating material surrounded by the inner layer material and the outer layer material, and at least the outer layer material of the envelope is a fluororesin sheet, Fluorine resin fiber cloth or fluororesin coated inorganic fiber cloth, a heating method using a jacket heater attached to the heated body so that the heated body and the inner layer material are in contact with each other,
A heating method using a jacket heater, which includes a step of applying a coating material containing a metal powder to an outer peripheral surface of an outer layer material after the jacket heater is mounted on a heated body, and drying.

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