JP4449657B2 - Insulation material - Google Patents

Description

The present invention relates to a heat insulating member having excellent heat insulating performance.

  In recent years, there has been an active movement to promote energy conservation as a countermeasure against global warming, which is a global environmental problem. With regard to consumer and industrial equipment, from the viewpoint of effective use of heat, a heat insulation material having excellent heat insulation performance is used. It has been demanded. In particular, when a heat insulating material is used in a high temperature region exceeding 150 ° C., an energy saving effect is remarkably exhibited, so that application to an electrophotographic apparatus and a semiconductor manufacturing apparatus is expected.

  In the high temperature region exceeding 150 ° C., unlike the room temperature region, the radiant heat conduction component by infrared rays cannot be ignored, so that the heat insulating performance of the heat insulating material is deteriorated. Therefore, in order to exhibit an excellent heat insulating effect in a high temperature region, a technique that uses a heat insulating material excellent in heat resistance and a means for suppressing infrared rays is necessary.

  As a technique for using both a heat insulating material and a means for suppressing infrared rays, a laminate of a flame-retardant and heat-resistant fiber sheet and an aluminum layer is vacuumed in a bag made of a sheet having an aluminum layer. A heat insulating method for a fixing device in which a heat reflecting member is provided inside a vacuum heat insulating material sealed in a state (for example, see Patent Document 1) or a cover having a heat insulating material has been reported (for example, see Patent Document 2).

  FIG. 17 is a cross-sectional view of a conventional vacuum heat insulating material described in Patent Document 1. In this vacuum heat insulating material 1 ′, a laminate 4 of sheets having a flame-retardant and heat-resistant fiber sheet 2 and an aluminum layer 3 is sealed in a bag 5 made of a sheet having an aluminum layer in a vacuum state. Is.

  Since this vacuum heat insulating material 1 'uses what has a flame retardance and heat resistance as a fiber sheet, it can be used also on the conditions which become high temperature of about 200 degreeC, and the fiber sheet 2, aluminum layer Infrared rays from the exothermic component can be reflected by the laminate 4 of the sheet having 3 and the temperature of the exothermic component can be maintained by the heat insulating material, which can contribute to energy saving of the electrophotographic apparatus. Yes.

FIG. 18 is a cross-sectional view of a conventional image forming apparatus described in Patent Document 2. In this image forming apparatus 6, a fixing cover 9 including a vacuum layer 8 is disposed so as to surround the upper periphery of the fixing apparatus 7, and a reflection sheet 10 is attached inside the fixing cover 9. . By covering the periphery of the fixing device with the fixing cover 9, the heat generated from the fixing device 7 is effectively insulated, thereby preventing the temperature rise in the image forming device 6 and reducing the power consumption of the fixing device 7. It is possible to plan.
JP 2001-265138 A Japanese Patent Laying-Open No. 2003-271044

  However, in the configuration of Patent Document 1 above, infrared rays generated from the heat source are absorbed by the plastic film constituting the bag of the vacuum heat insulating material 1 ′. Therefore, an aluminum layer 3 having an infrared reflecting action is inserted into the bag 5. However, the infrared reflection effect cannot be expected. Moreover, there is no description of flame retardancy and heat resistance in the bag 5 of the vacuum heat insulating material 1 ′, and the feasibility is poor. Further, if flame resistance or heat resistance is imparted to the bag of the vacuum heat insulating material 1 ', it is necessary to use engineering plastic or super engineering plastic, and therefore the vacuum heat insulating material 1' cannot be provided at low cost.

  In the configuration of Patent Document 2, the reflective sheet 10 is attached to the inside of the fixing cover 9 to reflect the radiant heat generated from the fixing device 7, thereby keeping the air in the fixing device 7 at a high temperature. However, since the air temperature in the fixing device 7 is as high as 120 ° C. to 180 ° C., the reflective sheet 10 itself is oxidized and deteriorated, so that the infrared reflection effect cannot be provided for a long time.

  This invention solves the said conventional subject, and it aims at providing the heat insulation member which has the outstanding heat insulation effect and the outstanding infrared rays reflection effect.

In order to solve the above conventional problems, the heat insulating member of the present invention is composed of at least a core material and a gas barrier laminate film covering the core material, and a vacuum heat insulating material formed by decompressing the inside of the laminate film. The metal cover is covered with a non-metal cover and a metal cover in which at least infrared transparent resin and a metal plate are stacked, and the metal cover is disposed so that the metal plate faces the vacuum heat insulating material. In addition, inorganic fibers are provided between the metal plate and the vacuum heat insulating material, and the inorganic fibers are oriented such that the fibers are parallel to the stacking direction of the vacuum heat insulating material and the nonmetallic cover. Is.

When the metal cover surface of the heat insulating member is installed in the direction of the heat source, infrared rays generated from the heat source are reflected by the metal plate, so that the surface temperature of the vacuum heat insulating material decreases. Thereby, it is not only necessary to impart high heat resistance to the vacuum heat insulating material, but it is possible to suppress deterioration of the vacuum heat insulating material with time. In addition, since the metal plate is protected by a resin having infrared transparency, rapid oxidation deterioration of the metal plate can be suppressed, and infrared rays can be reflected over a long period of time. Further, since the metal cover is present between the heat source and the vacuum heat insulating material, the vacuum heat insulating material is not directly exposed to the flame, so that it is not necessary to impart flame retardancy to the vacuum heat insulating material. Moreover, since it has inorganic fiber between a metal plate and a vacuum heat insulating material, since the heat | fever transmitted from a metal plate is transmitted to a vacuum heat insulating material via an inorganic fiber, the heat flow of a heat insulating member can be made small, and a heat insulating member The heat insulation effect can be improved. Further, the fibers are oriented so that the inorganic fibers are parallel to the stacking direction of the vacuum heat insulating material and the non-metal cover, and the inorganic fibers are oriented in the longitudinal direction of the metal cover. Since the orientation direction and the conduction direction of heat transmitted from the inorganic fiber to the vacuum heat insulating material are orthogonal, the heat insulating performance of the inorganic fiber is improved, the heat flow of the heat insulating member can be further reduced, and the heat insulating effect of the heat insulating member is further improved. be able to.

According to the present invention, it is not necessary to impart high heat resistance to the vacuum heat insulating material, and deterioration with time of the vacuum heat insulating material can be reduced. Moreover, rapid oxidation deterioration of the metal plate can be suppressed, and infrared rays can be reflected over a long period of time. Further, since the metal cover is present between the heat source and the vacuum heat insulating material, the vacuum heat insulating material is not directly exposed to the flame, so that it is not necessary to impart flame retardancy to the vacuum heat insulating material. Moreover, since it has inorganic fiber between a metal plate and a vacuum heat insulating material, since the heat | fever transmitted from a metal plate is transmitted to a vacuum heat insulating material via an inorganic fiber, the heat flow of a heat insulating member can be made small, and a heat insulating member The heat insulation effect can be improved. Further, the fibers are oriented so that the inorganic fibers are parallel to the stacking direction of the vacuum heat insulating material and the non-metal cover, and the inorganic fibers are oriented in the longitudinal direction of the metal cover. Since the orientation direction and the conduction direction of heat transmitted from the inorganic fiber to the vacuum heat insulating material are orthogonal, the heat insulating performance of the inorganic fiber is improved, the heat flow of the heat insulating member can be further reduced, and the heat insulating effect of the heat insulating member is further improved. be able to.

The invention of the heat insulating member according to claim 1 is composed of at least a core material and a gas barrier laminate film covering the core material, and a vacuum heat insulating material formed by decompressing the inside of the laminate film, The metal cover is covered with at least an infrared transparent resin and a metal cover, and the metal cover is disposed so that the metal plate faces the vacuum heat insulating material , It has an inorganic fiber between the said vacuum heat insulating materials, and the said inorganic fiber has a fiber orientated so that it may become parallel with respect to the lamination direction of the said vacuum heat insulating material and the said nonmetallic cover .

  When the metal cover surface of the heat insulating member is installed in the direction of the heat source, infrared rays generated from the heat source are reflected by the metal plate, so that the surface temperature of the vacuum heat insulating material decreases. Thereby, it is not only necessary to impart high heat resistance to the vacuum heat insulating material, but it is possible to suppress deterioration of the vacuum heat insulating material with time.

  In addition, since the metal plate is protected by a resin having infrared transparency, rapid oxidation deterioration of the metal plate can be suppressed, and infrared rays can be reflected over a long period of time. In addition, since the metal cover is present between the heat source and the vacuum heat insulating material, the vacuum heat insulating material is not directly exposed to the flame, so that it is not necessary to impart flame retardancy to the vacuum heat insulating material.

  In addition, the material, shape and thickness of the non-metal cover are not particularly specified. For example, PPS (polyphenylene sulfide) resin, PC (polycarbonate) resin, PET (polyethylene terephthalate) resin, etc. The thickness may be determined according to the strength required for the cover.

  Further, depending on the application temperature of the heat insulating member, a heat leak phenomenon in which the heat of the metal cover is transmitted to the non-metal cover occurs, and therefore a laminated body of inorganic fibers such as glass cloth may be used as the non-metal cover.

  Further, the material, shape and thickness of the metal plate are not particularly specified. For example, plate materials such as aluminum, silver, gold, nickel, copper and stainless steel, aluminum foil, silver foil, gold foil, nickel foil, Metal foils such as copper foil and stainless steel foil that are thinly stretched, and plate materials that are vapor-deposited on plastics such as aluminum, silver, gold, nickel, and copper can be considered, but they have high infrared reflectivity and low process costs. It is preferable to use an inexpensive aluminum plate or copper plate.

  In addition, the method for joining the metal plate and the resin having infrared transparency is not particularly specified. For example, physical joining methods such as screws and nails, spraying on the metal plate, adhesive, heat, etc. Bonding methods using chemical properties can be used.

In addition, by having inorganic fibers between the metal plate and the vacuum heat insulating material, heat transferred from the metal plate is transferred to the vacuum heat insulating material through the inorganic fibers, so the heat flow of the heat insulating member can be reduced, The heat insulation effect of the member can be improved.

  Further, the material of the inorganic fiber is not particularly specified, and for example, rock wool or glass wool can be used.

Further, the fibers are oriented so that the inorganic fibers are parallel to the stacking direction of the vacuum heat insulating material and the non- metal cover, and the inorganic fibers are oriented in the longitudinal direction of the metal cover. Since the orientation direction and the conduction direction of heat transmitted from the inorganic fiber to the vacuum heat insulating material are orthogonal, the heat insulating performance of the inorganic fiber is improved, the heat flow of the heat insulating member can be further reduced, and the heat insulating effect of the heat insulating member is further improved. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Form 1 of reference example )
FIG. 1 is a cross-sectional view of a heat insulating member according to Embodiment 1 of the reference example , and FIG. 2 is a cross-sectional view of a vacuum heat insulating material according to Embodiment 1 of the reference example .

  In FIG. 1, a heat insulating member 11 is obtained by covering the vacuum heat insulating material 1 with a non-metal cover 12, a metal cover 15 in which an infrared-transmitting resin 13 and a metal plate 14 are stacked with an adhesive 18. The metal cover 15 is arranged so that the metal plate 14 faces the vacuum heat insulating material 1. Moreover, in FIG. 2, the vacuum heat insulating material 1 covers the core material 16 with the gas barrier laminate film 17, and makes the inside into a pressure-reduced state.

  About the heat insulation member 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The non-metal cover 12 has an action of protecting the vacuum heat insulating material 1 against an external impact.

  The resin 13 having infrared transparency has a function of protecting the metal plate 14 against sudden oxidation deterioration and external impact and transmitting infrared rays.

  The metal plate 14 has an action of protecting the vacuum heat insulating material 1 against an external impact and protecting the vacuum heat insulating material 1 from flame. Moreover, by reflecting the infrared rays that have passed through the resin 13 having infrared transparency, the surface temperature of the vacuum heat insulating material 1 is lowered, and the deterioration over time of the vacuum heat insulating material 1 is reduced.

As described above, in the embodiment of the present reference example , the vacuum heat insulating material 1 is arranged such that the non-metallic cover 12, the resin 13 having infrared transparency and the metal plate 14 are opposed to the vacuum heat insulating material 1. It is possible to impart impact resistance, flame retardancy, and durability to the vacuum heat insulating material 1 by covering it with the metal cover 15 stacked on the surface.

An effective heat insulating effect can be obtained by attaching the heat insulating member 11 of Embodiment 1 of the present reference example as described above to a place where heat insulation or heat insulation is required. Examples of installation locations include industrial equipment such as thermostatic baths and semiconductor manufacturing equipment, information equipment such as computers, printers, copiers, and projectors, cooking appliances such as jar pots, rice cookers, microwave ovens, and water heaters. Every case is conceivable.

  The method for attaching the heat insulating member 11 is not particularly specified, and may be chemical bonding such as integral foaming with an adhesive or resin, or physical bonding such as hammering or pinching.

The result confirmed about the infrared rays reflection effect and metal plate protective effect of the heat insulation member 11 comprised as mentioned above is shown to the reference example 1 to the reference example 3, and a comparative example is shown to the comparative example 1 to the comparative example 4. FIG.

  Moreover, performance evaluation measured the metal cover 15 surface temperature when the heat insulation member 11 was installed so that the halogen heater of length 300mm might be enclosed. When the surface temperature of the metal cover 15 is improved as compared with the measured value of the heat insulating member (Comparative Example 1) in which the vacuum heat insulating material 1 is disposed on the metal cover 15 made of an iron plate, the evaluation standard of the infrared reflection effect is as follows. Judged to have infrared reflection effect.

  Further, the evaluation standard of the metal plate protection effect is that the heat insulating member 11 is left in a constant temperature oven at 150 ° C. for 30 days, and then the performance evaluation is performed again. If there was, it was judged that there was a metal plate protective effect. As will be described later, the surface temperature of the metal cover 15 in Comparative Example 1 and the surface temperature of the metal cover 15 after being left in the constant temperature oven were 144.1 ° C. and 146.3 ° C., respectively.

  Here, the infrared absorptance of the resin having infrared transmissivity is the infrared emissivity obtained at 150 ° C. using a Fourier transform infrared spectrophotometer JIR5500 type manufactured by JEOL Ltd. and an infrared radiation unit IR-IRR200. It was regarded as the absorption rate.

( Reference Example 1)
A conductive powder made of silicon oxide compound made of dry silica (Aerosil 300 average particle size: 7 nm) manufactured by Nippon Aerosil Co., Ltd. and carbon black (Toka Black # 7100F made by Tokai Carbon Co., Ltd. average particle size: 42 nm) has a weight ratio of The core material 16 of the vacuum heat insulating material 1 was produced by filling a non-woven bag made of polyethylene terephthalate and polypropylene with a mixture of 95: 5. The core material 16 was covered with a laminate film 17 having gas barrier properties, and the vacuum heat insulating material 1 was produced by reducing the pressure inside.

  Next, as resin 13 having infrared transparency, a 12 μm thick FEP film (infrared absorptivity 8%) was dry laminated on the surface of the 12 μm thick aluminum foil, and then the non-laminated surface of the aluminum foil was The metal cover 15 was produced by affixing on the iron plate 14 with a thickness of 0.5 mm.

  After disposing the vacuum heat insulating material 1 so as to contact the iron plate 14 of the metal cover 15, a cover 12 made of PPS resin (thickness 1 mm) was attached so as to cover the vacuum heat insulating material 1, and the heat insulating member 11 was produced.

  As a result of evaluation, the surface temperature of the metal cover 15 of the heat insulating member 11 and the surface temperature of the metal cover 15 after being left in the constant temperature furnace were 139.0 ° C. and 139.2 ° C., respectively. Compared with Comparative Example 1, since the surface temperature of the metal cover 15 was 5.1 ° C. lower, it was confirmed that the infrared reflection effect was improved. Further, the increase in the surface temperature of the metal cover 15 after being left in the high-temperature furnace was 0.2 ° C. compared with the initial temperature, and there was almost no change, so that the metal plate protection effect could be confirmed.

( Reference Example 2)
As a resin 13 having infrared transparency, a PET film having a thickness of 12 μm (infrared absorptivity of 18%) is dry-laminated on the surface of an aluminum foil having a thickness of 12 μm. The metal cover 15 was produced by affixing to a 5 mm iron plate 14.

A PPS resin (thickness 1 mm) cover is provided so as to cover the vacuum heat insulating material 1 after the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 is disposed so as to contact the iron plate 14 of the metal cover 15. 12 was attached and the heat insulation member 11 was produced.

  As a result of evaluation, the surface temperature of the metal cover 15 of the heat insulating member 11 and the surface temperature of the metal cover 15 after being left in the constant temperature furnace were 142.1 ° C. and 142.7 ° C., respectively. Compared with Comparative Example 1, since the surface temperature of the metal cover 15 was 2.0 ° C. lower, it was confirmed that the infrared reflection effect was improved. Further, the increase in the surface temperature of the metal cover 15 after being left in the high-temperature furnace was 0.6 ° C. compared with the initial temperature, and there was almost no change, so that the metal plate protective effect could be confirmed.

( Reference Example 3)
A laminate of a 12 μm thick FEP film (infrared absorptivity 8%) and a 12 μm thick PPS film (infrared absorptivity 10%) was designated as resin 13 having infrared transparency. The infrared absorption rate at this time was 25%. A metal cover 15 was produced by laminating the PPS film side of the laminate 13 on the surface of an aluminum plate 14 having a thickness of 0.2 mm.

After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to come into contact with the aluminum plate 14 of the metal cover 15, the PPS resin (thickness 1 mm) is made to cover the vacuum heat insulating material 1. The cover 12 was attached and the heat insulation member 11 was produced.

  As a result of evaluation, the surface temperature of the metal cover 15 of the heat insulating member 11 and the surface temperature of the metal cover 15 after being left in the constant temperature furnace were 143.5 ° C. and 143.8 ° C., respectively. Compared with Comparative Example 1, since the surface temperature of the metal cover 15 was 0.6 ° C. lower, it was confirmed that the infrared reflection effect was improved. Further, the increase in the surface temperature of the metal cover 15 after being left in the high-temperature furnace was 0.3 ° C. compared to the initial temperature, and there was almost no change, so that the metal plate protective effect could be confirmed.

(Comparative Example 1)
After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to be in contact with the iron plate using an iron plate having a thickness of 0.5 mm as a metal cover, PPS resin ( A cover made of 1 mm thick) was attached to produce a heat insulating member. As a result of evaluation, the surface temperature of the metal cover of the heat insulating member and the surface temperature of the metal cover after being left in the constant temperature oven were 144.1 ° C. and 146.3 ° C., respectively.

(Comparative Example 2)
A laminate of two 12 μm-thick PET films (infrared absorptivity 18%) stacked on top of each other was used as a resin having infrared transparency. The infrared absorption rate at this time was 30%. The laminate was laminated on the surface of an aluminum plate having a thickness of 0.2 mm to produce a metal cover.

After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to come into contact with the aluminum plate of the metal cover, a cover made of PPS resin (thickness 1 mm) is placed so as to cover the vacuum heat insulating material 1. Attachment and heat insulation member were produced.

  As a result of evaluation, the surface temperature of the metal cover of the heat insulating member and the surface temperature of the metal cover after being left in the constant temperature oven were 145.4 ° C. and 145.7 ° C., respectively. Compared with Comparative Example 1, since the surface temperature of the metal cover was 1.3 ° C. higher, an improvement in the infrared reflection effect could not be confirmed. However, the increase in the metal cover surface temperature after being left in the high-temperature furnace was 0.3 ° C. compared to the initial temperature, and there was almost no change, so the metal plate protective effect could be confirmed.

(Comparative Example 3)
A metal cover was prepared by laminating a nylon film having a thickness of 15 μm (infrared absorptivity 53%) and an aluminum plate having a thickness of 0.2 mm. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to come into contact with the aluminum plate of the metal cover, a cover made of PPS resin (thickness 1 mm) is placed so as to cover the vacuum heat insulating material 1. Attachment and heat insulation member were produced.

  As a result of evaluation, the metal cover surface temperature of the heat insulating member and the metal cover surface temperature after being left in the constant temperature furnace were 150.5 ° C. and 151.1 ° C., respectively. Compared with Comparative Example 1, since the metal cover surface temperature was 6.4 ° C. higher, the infrared reflection effect could not be confirmed. However, the rise in the metal cover surface temperature after leaving in the high-temperature furnace was 0.6 ° C. compared to the initial temperature, showing almost no change, confirming the metal plate protection effect.

(Comparative Example 4)
After placing a vacuum heat insulating material produced in the same process as in Reference Example 1 so that an aluminum plate having a thickness of 0.5 mm is used as a metal cover and in contact with the aluminum plate, a PPS resin ( A cover made of 1 mm thick) was attached to produce a heat insulating member.

  As a result of evaluation, the metal cover surface temperature of the heat insulating member and the metal cover surface temperature after being left in the constant temperature oven were 124.9 ° C. and 127.1 ° C., respectively. Compared with Comparative Example 1, since the metal cover surface temperature was lower by 19.2 ° C., it was confirmed that the infrared reflection effect was improved. However, since the increase in the metal cover surface temperature after leaving in the high temperature furnace increased by 2.2 ° C. compared to the initial temperature, the metal plate protection effect could not be confirmed.

Table 1 and FIG. 3 show the results ( Reference Example 1 to Reference Example 3 and Comparative Example 1 to Comparative Example 4) of confirming the infrared reflection effect and the metal plate protection effect of the heat insulating member configured as described above. .

（表１）の結果から、金属板１４の表面を、赤外線透過性を有する樹脂１３で被覆することにより、金属板１４の赤外線反射効果の急激な酸化劣化を防止することができた。また、図３の結果から、赤外線透過性を有する樹脂１３の赤外線吸収率を２５％以下とすることにより、赤外線透過性を有する樹脂１３を透過した赤外線を、金属板１４で効率良く反射することがわかった。

From the results of (Table 1), it was possible to prevent rapid oxidation deterioration of the infrared reflection effect of the metal plate 14 by coating the surface of the metal plate 14 with the resin 13 having infrared transparency. Further, from the result of FIG. 3, by setting the infrared absorptivity of the resin 13 having infrared transparency to 25% or less, the infrared rays transmitted through the resin 13 having infrared transparency can be efficiently reflected by the metal plate 14. I understood.

(Form 2 of reference example )
FIG. 4 shows a cross-sectional view of the heat insulating member 11 in Embodiment 2 of the reference example . In FIG. 4, the heat insulating member 11 is obtained by covering the vacuum heat insulating material 1 with a non-metal cover 12, a metal cover 15 in which a resin 13 having infrared transparency and a metal plate 14 are stacked, and the metal cover 15. Is arranged so that the metal plate 14 faces the vacuum heat insulating material 1, and the resin 13 having infrared transparency and the metal plate 14 are joined by thermocompression bonding.

About the heat insulation member 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Incidentally, Embodiment 1 and portions of the same configuration as reference examples, description thereof will be omitted.

  Since the resin 13 having infrared transparency is a material having good adhesiveness to metal, no adhesive is required for joining to the metal plate 14. Thereby, since there is no infrared absorption with an adhesive agent, the infrared reflective efficiency of a metal cover improves.

The result confirmed about the infrared reflective effect of the heat insulating member comprised as mentioned above is shown in the reference example 4, and a comparative example is shown in the comparative example 5. FIG.

  Moreover, performance evaluation measured the metal cover surface temperature when the heat insulation member 11 was installed so that the halogen heater of length 300mm might be enclosed.

( Reference Example 4)
A metal cover 15 was produced by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm as a resin 13 having infrared transparency to the surface of an aluminum plate 14 having a thickness of 0.2 mm. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to come into contact with the aluminum plate 14 of the metal cover 15, the PPS resin (thickness 1 mm) is made to cover the vacuum heat insulating material 1. The cover 12 was attached and the heat insulation member 11 was produced. When the evaluation was performed, the surface temperature of the metal cover 15 of the heat insulating member 11 was 128.0 ° C.

(Comparative Example 5)
A metal cover was produced by dry laminating a 12 μm thick ETFE film (infrared absorptivity 8%) as a resin having infrared transparency on the surface of an aluminum plate having a thickness of 0.2 mm. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to come into contact with the aluminum plate of the metal cover, a cover made of PPS resin (thickness 1 mm) is placed so as to cover the vacuum heat insulating material 1. Attachment and heat insulation member were produced. When evaluated, the metal cover surface temperature of the heat insulating member was 132.4 ° C.

Table 2 shows the results ( Reference Example 4 and Comparative Example 5) of confirming the infrared reflection effect of the heat insulating member 11 configured as described above.

（表２）の結果から、赤外線透過性を有する樹脂１３を、金属板１４に熱圧着することにより、赤外線透過性を有する樹脂１３と、金属板１４との間に存在する接着剤を無くしたため、金属カバー１５の赤外線反射効果が向上することがわかった。

From the results of (Table 2), the adhesive 13 existing between the resin 13 having infrared transparency and the metal plate 14 was eliminated by thermocompression bonding the resin 13 having infrared transparency to the metal plate 14. It was found that the infrared reflection effect of the metal cover 15 was improved.

(Form 3 of reference example )
FIG. 5 shows a cross-sectional view of the heat insulating member 11 in Embodiment 3 of the reference example , and FIG. 6 is a schematic diagram of an adhesive applied in a grid as an example of application of the adhesive part in Embodiment 3 of the reference example . FIG.

  In FIG. 5, the heat insulating member 11 is obtained by covering the vacuum heat insulating material 1 with a non-metal cover 12, a metal cover 15 in which a resin 13 having infrared transparency and a metal plate 14 are stacked, and the metal cover 15. Is arranged such that the metal plate 14 faces the vacuum heat insulating material 1, and the resin 13 having infrared transparency and the metal plate 14 are partially bonded by an adhesive 18. In FIG. 6, the adhesive 18 is applied so that the bonded portion 19 and the non-bonded portion 20 are in a lattice shape.

About the heat insulation member 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Incidentally, Embodiment 1 or portions of Embodiment 2 of the same configuration of the reference example as reference examples, description thereof will be omitted.

  The resin 13 having infrared transparency and the metal plate 14 are bonded so as to form an adhesive portion 19 and a non-adhesive portion 20 with an adhesive 18. As a result, a part of the infrared light incident on the bonding part 19 is absorbed by the bonding part 19 and becomes heat, but the infrared light incident on the non-bonding part 20 is reflected by the metal plate 14 without being absorbed. The infrared reflection efficiency of the cover 15 is improved.

The result confirmed about the infrared reflective effect of the heat insulation member 11 comprised as mentioned above is shown in the reference example 5, and a comparative example is shown in the comparative example 6. FIG.

  Moreover, performance evaluation measured the surface temperature of the metal cover 15 when the heat insulation member 11 was installed so that the halogen heater of length 300mm might be enclosed.

( Reference Example 5)
The adhesive 18 is applied to the surface of an aluminum foil having a thickness of 12 μm using a gravure printing method so that the adhesive portion 19 and the non-adhesive portion 20 are 45:55 (adhesive application rate: 45%), and infrared rays are applied. After laminating a 12 μm thick FEP film (infrared absorptivity 8%) as the resin 13 having transparency, the non-laminated surface of the aluminum foil is attached to an iron plate 14 having a thickness of 0.5 mm to provide a metal cover. 15 was produced.

A PPS resin (thickness 1 mm) cover is provided so as to cover the vacuum heat insulating material 1 after the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 is disposed so as to contact the iron plate 14 of the metal cover 15. 12 was attached and the heat insulation member 11 was produced. When the evaluation was performed, the surface temperature of the metal cover 15 of the heat insulating member 11 was 130.6 ° C.

(Comparative Example 6)
An adhesive is applied to the surface of an aluminum foil having a thickness of 12 μm using a gravure printing method so that an adhesive portion and a non-adhesive portion are 45:55 (adhesive application rate: 45%), and infrared transmittance is increased. After laminating a 12 μm-thick FEP film (infrared absorptivity 8%) as the resin having, a metal cover was prepared by sticking the non-laminated surface of the aluminum foil to an iron plate having a thickness of 0.5 mm. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 1 so as to come into contact with the iron plate of the metal cover, a cover made of PPS resin (thickness 1 mm) is attached so as to cover the vacuum heat insulating material 1 A heat insulating member was produced. As a result of evaluation, the surface temperature of the metal cover of the heat insulating member was 139.0 ° C.

Table 3 shows the results ( Reference Example 5 and Comparative Example 6) of confirming the infrared reflection effect of the heat insulating member 11 configured as described above.

（表３）の結果から、赤外線透過性を有する樹脂１３と金属板１４の間に存在する接着剤１８を部分的に塗布することにより、接着部１８へ入射した赤外線の一部は接着剤１８で吸収され、熱となるが、非接着部２０へ入射した赤外線は接着剤１８で吸収されることなく、金属板１４で反射されるため、金属カバー１５の赤外線反射効果が向上することがわかった。

From the results of (Table 3), by partially applying the adhesive 18 existing between the resin 13 having infrared transparency and the metal plate 14, a part of the infrared rays incident on the adhesive portion 18 is adhesive 18. However, the infrared ray incident on the non-bonded portion 20 is reflected by the metal plate 14 without being absorbed by the adhesive 18, so that the infrared reflection effect of the metal cover 15 is improved. It was.

(Form 4 of reference example )
FIG. 7 shows a cross-sectional view of the heat insulating member 11 in Embodiment 4 of the reference example , and FIG. 8 shows a cross-sectional view of the vacuum heat insulating material 1 in Embodiment 4 of the reference example .

  In FIG. 7, the heat insulating member 11 is obtained by covering the vacuum heat insulating material 1 with a non-metal cover 12, a metal cover 15 in which a resin 13 having infrared transparency and a metal plate 14 are stacked, and the metal cover 15. Is arranged such that the metal plate 14 faces the vacuum heat insulating material 1, and the vacuum heat insulating material 1 has a peripheral portion (which can be formed on the outer periphery of the core material 16, as shown in FIG. 8. A fin portion 21 consisting only of a laminate film 17 not sandwiching 16 is bent toward the non-metal cover 12 side.

About the heat insulation member 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. The portion of the embodiment 3 of the same structure of Example Modes 1 reference example, description thereof will be omitted.

  Since the vacuum heat insulating material 1 bent the peripheral part 21 to the nonmetallic cover 12 side, the effective heat insulation area of the vacuum heat insulating material 1 can be enlarged. Thereby, since the air heat insulation layer in the heat insulation member 11 reduces, it has the effect | action which the heat insulation effect of the heat insulation member 11 improves.

The result confirmed about the heat insulation effect of the heat insulation member 11 comprised as mentioned above is shown in the reference example 6, and a comparative example is shown in the comparative example 7. FIG.

  Moreover, the performance evaluation measured the surface temperature of the nonmetallic cover 12 when the heat insulation member 11 was installed so that the halogen heater of length 300mm might be enclosed.

( Reference Example 6)
A conductive powder made of silicon oxide compound made of dry silica (Aerosil 300 average particle size: 7 nm manufactured by Nippon Aerosil Co., Ltd.) and carbon black (Toka Black # 7100F average particle size: 42 nm made by Tokai Carbon Co., Ltd.) has a weight ratio of 95. : The core material 16 of the vacuum heat insulating material 1 was produced by filling the non-woven bag made of polyethylene terephthalate and polypropylene with the mixture so as to be 5. The core material 16 was covered with a laminate film 17 having a gas barrier property, and after the inside was in a reduced pressure state, the peripheral edge portion 21 in the longitudinal direction was bent to produce the vacuum heat insulating material 1.

  As a resin 13 having infrared transparency, a metal cover 15 was prepared by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm to the surface of an aluminum plate 14 having a thickness of 0.2 mm. After the vacuum heat insulating material 1 was disposed so as to contact the aluminum plate 14 of the metal cover 15, a cover 12 made of PPS resin (thickness 1 mm) was attached so as to cover the vacuum heat insulating material 1, and the heat insulating member 11 was produced. . At this time, the vacuum heat insulating material 1 was obtained by bending the peripheral edge portion 21 in the longitudinal direction of the metal cover 15. As a result of the evaluation, the surface temperature of the nonmetallic cover 12 of the heat insulating member 11 was 57.8 ° C.

(Comparative Example 7)
When the evaluation was performed using the heat insulating member 11 used in Reference Example 4, the surface temperature of the nonmetallic cover 12 of the heat insulating member 11 was 60.0 ° C.

Table 4 shows the results ( Reference Example 6 and Comparative Example 7) of confirming the infrared reflection effect of the heat insulating member 11 configured as described above.

（表４）の結果から、真空断熱材１の周縁部２１を非金属カバー１２側に折り曲げて断熱部材１１中へ配設することにより、真空断熱材１の有効断熱面積が大きくなり、断熱部材１１中の空気断熱層が減少するため、断熱部材１１の断熱効果が向上することがわかった。

From the result of (Table 4), the effective heat insulation area of the vacuum heat insulating material 1 becomes large by bending the peripheral edge portion 21 of the vacuum heat insulating material 1 to the non-metal cover 12 side and disposing it in the heat insulating member 11. Since the air heat insulation layer in 11 decreased, it turned out that the heat insulation effect of the heat insulation member 11 improves.

(Embodiment 1 )
FIG. 9 shows a cross-sectional view of the heat insulating member according to Embodiment 1 of the present invention. In FIG. 9, the heat insulating member 11 is obtained by covering the vacuum heat insulating material 1 with a non-metal cover 12, a metal cover 15 in which a resin 13 having infrared transparency and a metal plate 14 are stacked, and the metal cover 15. Is arranged so that the metal plate 14 faces the vacuum heat insulating material 1, and inorganic fibers 22 are inserted between the vacuum heat insulating material 1 and the metal plate 14.

About the heat insulation member 11 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. The portion of the embodiment 4 of the same structure of Example Modes 1 reference example, description thereof will be omitted.

  In the heat insulating member 11, the heat from the metal plate 14 can be insulated by inserting the inorganic fibers 22 between the vacuum heat insulating material 1 and the metal plate 14. Thereby, when the surface temperature of the vacuum heat insulating material 1 falls, it has the effect | action that the heat flux of the heat insulation member 11 becomes small, and the heat insulation effect of the heat insulation member 11 improves.

The result confirmed about the infrared reflective effect of the heat insulation member 11 comprised as mentioned above is shown in Example 1 and Example 2 , and a comparative example is shown in the comparative example 8. FIG.

  In the performance evaluation, the surface temperature of the nonmetallic cover 12 and the heat flux of the surface of the nonmetallic cover 12 when the heat insulating member 11 was installed so as to surround the 300 mm long halogen heater were measured.

(Example 1 )
As a resin 13 having infrared transparency, a metal cover 15 was prepared by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm to the surface of an aluminum plate 14 having a thickness of 0.2 mm.

Glass wool (thickness 1 mm) 22 having a fiber direction oriented in a direction parallel to the aluminum plate 14 was disposed so as to contact the aluminum plate 14 of the metal cover 15. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 6 so as to come into contact with the glass wool 22, a cover 12 made of PPS resin (thickness 1 mm) is attached so as to cover the vacuum heat insulating material 1, The heat insulating member 11 was produced.

  At this time, the vacuum heat insulating material 1 was obtained by bending the peripheral edge portion 21 in the longitudinal direction of the metal cover 15. As a result of evaluation, the surface temperature of the nonmetallic cover 12 of the heat insulating member 11 and the heat flux of the surface of the nonmetallic cover 12 were 55.3 ° C. and 101.9 W / m 2, respectively.

(Example 2 )
A metal cover 15 was produced by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm as a resin 13 having infrared transparency to the surface of an aluminum plate 14 having a thickness of 0.2 mm. Glass wool 22 (thickness 1 mm) having a random fiber direction was disposed so as to come into contact with the aluminum plate 14 of the metal cover 15. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 6 so as to come into contact with the glass wool 22, a cover 12 made of PPS resin (thickness 1 mm) is attached so as to cover the vacuum heat insulating material 1, The heat insulating member 11 was produced.

  At this time, the vacuum heat insulating material 1 was obtained by bending the peripheral edge portion 21 in the longitudinal direction of the metal cover 15. As a result of evaluation, the surface temperature of the nonmetallic cover 12 of the heat insulating member 11 and the heat flux of the surface of the nonmetallic cover 12 were 56.6 ° C. and 104.5 W / m 2, respectively.

(Comparative Example 8)
When the evaluation was performed using the heat insulating member 11 used in Reference Example 6, the surface temperature of the nonmetallic cover 12 and the heat flux of the surface of the nonmetallic cover 12 of the heat insulating member 11 were 57.8 ° C. and 107.1 W, respectively. / M2.

Table 5 shows the results (Example 1 , Example 2, and Comparative Example 8) of confirming the infrared reflection effect of the heat insulating member 11 configured as described above.

（表５）の結果から、真空断熱材１と金属板１５との間に無機繊維２２を挿入することで、金属板１５からの熱を断熱することができる。これにより、断熱部材１１の熱流束が小さくなり、断熱部材１１の断熱効果が向上することがわかった。

From the result of (Table 5), the heat from the metal plate 15 can be insulated by inserting the inorganic fiber 22 between the vacuum heat insulating material 1 and the metal plate 15. Thereby, it turned out that the heat flux of the heat insulation member 11 becomes small, and the heat insulation effect of the heat insulation member 11 improves.

( Form 5 of reference example )
FIG. 10 shows a cross-sectional view of the heat insulating member 11 in Embodiment 5 of the reference example . In FIG. 10, a heat insulating member 11 is obtained by covering the vacuum heat insulating material 1 with a non-metal cover 12, a metal cover 15 in which a resin 13 having infrared transparency and a metal plate 14 are stacked, and the metal cover 15. Is arranged so that the metal plate 14 faces the vacuum heat insulating material 1.

The result confirmed about the heat insulation effect of the heat insulating member comprised as mentioned above is shown in the reference example 7 , and the comparative example is shown in the comparative example 10 and the comparative example 11. FIG.

  The performance evaluation was made by measuring the surface temperature of the non-metallic cover 12 when the heat insulating member 11 was installed so as to surround the halogen heater having a length of 300 mm, and then leaving the heat insulating member 11 in a constant temperature oven at 150 ° C. for 30 days. Later, performance evaluation was performed again, and the degree of deterioration of the heat insulating effect of the heat insulating member 11 was compared.

( Reference Example 7 )
A metal cover 15 was produced by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm as a resin 13 having infrared transparency to the surface of an aluminum plate 14 having a thickness of 0.2 mm. After placing the vacuum heat insulating material 1 produced in the same process as in Reference Example 6 so as to be in contact with the aluminum plate 14 of the metal cover 15, the PPS resin (thickness 1 mm) is made to cover the vacuum heat insulating material 1. The cover 12 was attached and the heat insulation member 11 was produced.

  As a result of the evaluation, the surface temperature of the nonmetallic cover 12 of the heat insulating member 11 was 57.8 ° C. Further, the surface temperature of the non-metallic cover 12 of the heat insulating member 11 after being left in the constant temperature oven was 58.0 ° C.

(Comparative Example 9)
Using glass wool as the core material of the vacuum heat insulating material 1, the core material was covered with a laminate film having gas barrier properties, the inside was decompressed, and the vacuum heat insulating material 1 was produced by folding the peripheral edge in the longitudinal direction.

  A metal cover was prepared by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm as a resin having infrared transparency to the surface of an aluminum plate having a thickness of 0.2 mm.

  After the vacuum heat insulating material 1 produced in this comparative example is disposed so as to come into contact with the aluminum plate of the metal cover, a PPS resin (thickness 1 mm) cover is attached so as to cover the vacuum heat insulating material 1, and a heat insulating member Was made.

  When evaluated, the non-metallic cover surface temperature of the heat insulating member was 56.6 ° C. Further, the surface temperature of the non-metallic cover of the heat insulating member after being left in the constant temperature oven was 62.9 ° C.

(Comparative Example 10)
Using the continuous urethane foam as the core material of the vacuum heat insulating material 1, the core material was covered with a laminated film having gas barrier properties, the inside was decompressed, and the vacuum heat insulating material 1 was produced by folding the peripheral edge in the longitudinal direction.

  As a resin having infrared transparency, a metal cover was prepared by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm to the surface of an aluminum plate having a thickness of 0.2 mm. After placing the vacuum heat insulating material 1 produced in this comparative example so as to contact the aluminum plate of the metal cover, a cover made of PPS resin (thickness 1 mm) is attached so as to cover the vacuum heat insulating material 1, and a heat insulating member Was made.

  When evaluated, the non-metallic cover surface temperature of the heat insulating member was 58.1 ° C. Further, the surface temperature of the non-metallic cover of the heat insulating member after being left in the constant temperature oven was 63.7 ° C.

Table 6 shows the results ( Reference Example 7, Comparative Example 9, and Comparative Example 10) for confirming the heat insulating effect of the heat insulating member configured as described above.

（表６）の結果から、真空断熱材１の芯材を、乾式シリカと導電性粉体との混合物からなる芯材を用いることにで、グラスウールやその他の真空断熱材１に使用される芯材と比較して、真空断熱材１の内圧上昇に伴う断熱性能の劣化が小さいことが確認できた。

From the results of (Table 6), the core material used for glass wool or other vacuum heat insulating material 1 is obtained by using a core material made of a mixture of dry silica and conductive powder as the core material of the vacuum heat insulating material 1. Compared with the material, it was confirmed that the deterioration of the heat insulating performance accompanying the increase in the internal pressure of the vacuum heat insulating material 1 was small.

( Form 6 of reference example )
FIG. 11 shows a cross-sectional view of the vacuum heat insulating material 1 in Embodiment 6 of the reference example . In FIG. 11, the vacuum heat insulating material 1 covers the core material 16 with a laminate film 23 having an aluminum foil layer and a laminate film 24 having an aluminum vapor deposition layer, and the inside is decompressed.

About the vacuum heat insulating material 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In addition, the part of the same structure as Embodiment 1 and Embodiment 1 of the reference example to Embodiment 5 of the reference example is omitted.

  The vacuum heat insulating material 1 exhibits a high gas barrier property by directing the laminate film 23 having an aluminum foil layer toward the heat source side. Further, the heat transferred from the heat source to the laminate film 23 having the aluminum foil layer is transferred to the laminate film 24 having the aluminum vapor deposition layer, but the aluminum vapor deposition layer is very thin compared to the aluminum foil, so that heat is not easily transmitted. It has the effect | action that the heat insulation effect of the vacuum heat insulating material 1 can be improved.

The result confirmed about the heat insulation effect of the heat insulation member 11 comprised as mentioned above is shown in the reference example 8 , and a comparative example is shown in the comparative example 12. FIG.

  Moreover, performance evaluation measured the nonmetallic cover surface temperature when the heat insulation member 11 was installed so that the halogen heater of length 300mm might be enclosed.

( Reference Example 8 )
A conductive powder made of silicon oxide compound made of dry silica (Aerosil 300 average particle size: 7 nm) manufactured by Nippon Aerosil Co., Ltd. and carbon black (Toka Black # 7100F made by Tokai Carbon Co., Ltd. average particle size: 42 nm) has a weight ratio of The core material 16 of the vacuum heat insulating material 1 was produced by filling a non-woven bag made of polyethylene terephthalate and polypropylene with a mixture of 95: 5. The core material 16 was covered with a laminate film having a gas barrier property shown in (Table 7), and after the inside was in a reduced pressure state, the peripheral edge portion 21 in the longitudinal direction was bent to produce the vacuum heat insulating material 1.

次に、赤外線透過性を有する樹脂１３として厚さ２５μｍの変性ＥＴＦＥフィルム（赤外線吸収率８％）を、厚さ０．２ｍｍのアルミニウム板１４の表面に、熱圧着することで金属カバー１５を作製した。

Next, a metal cover 15 is prepared by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm as a resin 13 having infrared transparency to the surface of an aluminum plate 14 having a thickness of 0.2 mm. did.

  After the vacuum heat insulating material 1 was disposed so as to contact the aluminum plate 14 of the metal cover 15, a cover 12 made of PPS resin (thickness 1 mm) was attached so as to cover the vacuum heat insulating material 1, and the heat insulating member 11 was produced. . As a result of the evaluation, the surface temperature of the nonmetallic cover 12 of the heat insulating member 11 was 57.8 ° C.

(Comparative Example 12)
The core material 16 produced in the same process as in Reference Example 8 is covered with a laminate film having gas barrier properties as shown in (Table 7), the inside is made into a reduced pressure state, and then the peripheral edge portion 21 in the longitudinal direction is bent to form a vacuum. The heat insulating material 1 was produced.

  Next, a metal cover was prepared by thermocompression bonding a modified ETFE film (infrared absorptivity 8%) having a thickness of 25 μm as a resin having infrared transparency to the surface of an aluminum plate having a thickness of 0.2 mm.

  After the vacuum heat insulating material 1 was disposed so as to contact the aluminum plate of the metal cover, a PPS resin (thickness 1 mm) cover was attached so as to cover the vacuum heat insulating material 1 to produce a heat insulating member. When evaluated, the non-metallic cover surface temperature of the heat insulating member was 61.9 ° C.

Table 8 shows the results ( Reference Example 8 and Comparative Example 12) of confirming the heat insulating effect of the heat insulating member 11 configured as described above.

（表８）の結果から、断熱部材１１において、真空断熱材１のラミネートフィルム２３，２４のうち、非金属カバー１２と対向する面の少なくとも一部を、金属を蒸着したフィルム２４とすることにより、金属カバー１５と対向する面から、非金属カバー１２と対向する面へ伝わる熱が小さくなるため、断熱部材１１の断熱効果が向上することがわかった。

From the results of (Table 8), in the heat insulating member 11, among the laminated films 23 and 24 of the vacuum heat insulating material 1, at least a part of the surface facing the nonmetallic cover 12 is a film 24 on which metal is deposited. It has been found that since the heat transmitted from the surface facing the metal cover 15 to the surface facing the non-metal cover 12 is reduced, the heat insulating effect of the heat insulating member 11 is improved.

( Reference example form 7 )
FIG. 12 shows a cross-sectional view of the core material in Embodiment 7 of the reference example . In FIG. 12, a core material 16 is obtained by covering a mixture 25 made of dry silica and conductive powder with an inner bag 26 made of a nonwoven fabric, and the inner bag 26 forms a center seal portion 27.

The operation | movement and effect | action are demonstrated below about the core material 16 comprised as mentioned above. Note that portions having the same configurations as those of Embodiment 1 and Embodiments 1 to 6 of the reference example are not described.

  When bending or bending the vacuum heat insulating material 1, the center seal portion 27 of the inner bag 26 serves as a fulcrum, and wrinkles concentrate on the vacuum heat insulating material 1 along the center seal portion 27. Wrinkles are less likely to occur. Thereby, it has the effect | action that the vacuum heat insulating material 1 can be arrange | positioned along the metal plate 14. FIG.

The result confirmed about the application effect of the core material 16 comprised as mentioned above is shown in the reference example 9 , and a comparative example is shown in the comparative example 13. FIG.

( Reference Example 9 )
A conductive powder made of silicon oxide compound made of dry silica (Aerosil 300 average particle size: 7 nm) manufactured by Nippon Aerosil Co., Ltd. and carbon black (Toka Black # 7100F made by Tokai Carbon Co., Ltd. average particle size: 42 nm) has a weight ratio of The core material 16 of the vacuum heat insulating material 1 was produced by filling the nonwoven fabric bag 26 having a center seal bag shape made of polyethylene terephthalate and polypropylene with the mixture 25 so as to be 95: 5.

  The core material 16 was covered with a laminate film 17 having a gas barrier property, and the vacuum heat insulating material 1 was produced by setting the inside to a reduced pressure state. When the vacuum heat insulating material 1 was bent into a semicircular shape, wrinkles were generated around the center seal portion as shown in FIG.

(Comparative Example 13)
A conductive powder made of silicon oxide compound made of dry silica (Aerosil 300 average particle size: 7 nm) manufactured by Nippon Aerosil Co., Ltd. and carbon black (Toka Black # 7100F made by Tokai Carbon Co., Ltd. average particle size: 42 nm) has a weight ratio of The mixture of 95: 5 was filled into a non-woven bag having a three-side sealed bag shape made of polyethylene terephthalate and polypropylene to prepare a vacuum heat insulating material core. This core material was covered with a laminate film having gas barrier properties, and a vacuum heat insulating material was produced by setting the inside to a reduced pressure state.

  When this vacuum heat insulating material was bent into a semicircular shape, many wrinkles as shown in FIG.

  From the above, when bending or bending the vacuum heat insulating material 1, the center seal portion 27 of the inner bag 26 serves as a fulcrum, and wrinkles concentrate on the vacuum heat insulating material 1 along the center seal portion 27. Wrinkles are less likely to occur in other parts. Thereby, it turned out that it becomes easy to arrange | position the vacuum heat insulating material 1 along the metal plate 14. FIG.

( Form 8 of reference example )
FIG. 15 is a cross-sectional view of an electrophotographic apparatus that is a heat insulating member application device in Embodiment 8 of the reference example , and FIG. 16 is a cross-sectional view of the heat insulating member in Embodiment 8 of the reference example .

  Printing on the recording paper 29 in the electrophotographic apparatus 28 having the fixing device 7 forms an electrostatic charge image on the surface of the photosensitive drum 30, adsorbs the toner from the toner storage portion 31, and then passes through the transfer drum 32. And transferred onto the recording paper 29. The recording paper 29 onto which the toner image has been transferred is carried into the fixing device 7, and the recording paper 29 is passed between a heat fixing roller 33 and a pressure roller 34 kept at a high temperature, whereby the toner is melted and fixed.

  The heat insulating member 11 is disposed around the heat fixing roller 33 and the pressure roller 34 so as to surround the heat fixing roller 33 and the pressure roller 34 in order to maintain a predetermined high temperature. As shown in FIG. 16, the recesses 35 are provided in the heat insulating member 11 by forming holes and holes in the metal cover 15 and the vacuum heat insulating material 1, respectively. By attaching the thermostat 36 to the recess 35, the temperature of the heat fixing roller 33 can be controlled.

  Thereby, the heat generated from the heat fixing roller 33 is insulated by the heat insulating member 11, so that the heat fixing roller 33 can be kept warm. In addition, a heat-sensitive control device (not shown) and a transfer device such as the toner storage unit 31 and the photosensitive drum 30 can be maintained for a long time at 45 ° C. or less where the toner is not adversely affected.

  An effective heat insulating effect can be obtained by attaching the heat insulating member according to the present invention to a place where heat insulation or heat insulation is required. Examples of installation locations include industrial equipment such as thermostatic baths and semiconductor manufacturing equipment, information equipment such as computers, printers, copiers, and projectors, and cooking appliances such as jar pots, rice cookers, microwave ovens, and water heaters. Conceivable.

Cross-sectional perspective view of a heat insulating member in Reference Example 1 Sectional drawing of the vacuum heat insulating material in form 1 of a reference example Characteristic diagram showing the relationship between the infrared absorptivity of the resin having infrared transparency and the metal cover surface temperature Cross-sectional perspective view of heat insulating member in embodiment 2 of reference example Cross-sectional perspective view of a heat insulating member in Embodiment 3 of the reference example Schematic diagram of adhesive in form 3 of reference example Cross-sectional perspective view of heat insulating member in embodiment 4 of reference example Sectional drawing of the vacuum heat insulating material in form 4 of a reference example Sectional perspective view of the heat insulation member in Embodiment 1 of this invention Sectional drawing of the heat insulation member in form 5 of a reference example Sectional drawing of the vacuum heat insulating material in form 6 of a reference example Sectional drawing of the core material of the vacuum heat insulating material in form 7 of a reference example The schematic diagram which shows the wrinkle of the vacuum heat insulating material in the reference example 9 The schematic diagram which shows the wrinkle of the vacuum heat insulating material in the comparative example 13 Sectional drawing of the electrophotographic apparatus in Reference Example Form 8 Sectional drawing of the heat insulation member in form 8 of a reference example Cross section of conventional vacuum insulation Sectional view of a conventional image forming apparatus

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 7 Fixing device 11 Heat insulating member 12 Non-metallic cover 13 Infrared transparent resin 14 Metal plate 15 Metal cover 16 Core material 17 Laminating film 18 Adhesive 19 Adhesive part 20 Non-adhesive part 21 Peripheral part 22 Inorganic fiber 23 Laminate film having aluminum foil layer 24 Laminate film having aluminum vapor deposition layer 25 Mixture of dry silica and conductive powder 26 Inner bag 27 Center seal portion 28 Electrophotographic apparatus

Claims (1)

A vacuum heat insulating material composed of at least a core material and a gas barrier laminate film covering the core material, and having a reduced pressure inside the laminate film, a non-metal cover, a resin having at least infrared transparency, and a metal plate The metal cover is disposed so that the metal plate faces the vacuum heat insulating material, and has inorganic fibers between the metal plate and the vacuum heat insulating material. And the said inorganic fiber is a heat insulating member characterized by the fiber being orientated so that it may become parallel with respect to the lamination direction of the said vacuum heat insulating material and the said nonmetallic cover .

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