Insulation material, foldable insulation material

Abstract

We provide insulation materials that are easy to handle, including foldable insulation materials. [Solution] The thermal insulation material 1 comprises a glass wool layer 5 formed of glass fibers, a bubble sheet layer 10 having a cap film 11 laminated on the glass wool layer 5 and having a plurality of caps 11a, a back film 12 laminated on the cap film 11 to seal air in the plurality of caps 11a, and a sealing part 30 that covers and seals the glass wool layer 55.

Description

Technical Field

[0001] The present invention relates to a heat insulating material provided with a fibrous heat insulating material and a foldable heat insulating material.

Background Art

[0002] Conventionally, for heat insulation of automobiles and the like, there has been a heat insulating material in which a bubble sheet and a fibrous heat insulating material such as glass wool are laminated (for example, Patent Document 1). However, such a heat insulating material has been difficult to handle because fibers that have escaped from the fibrous heat insulating material may dissipate to the surroundings.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a heat insulating material and a foldable heat insulating material that facilitate handling of the fibrous heat insulating material.

Means for Solving the Problems

[0005] One embodiment of the present invention is, for example, a fibrous heat insulating material layer formed of a fibrous heat insulating material, a cap film laminated on the fibrous heat insulating material layer and having a plurality of caps, and a back film laminated on the cap film to enclose air in the plurality of caps. A heat insulating material including a bubble sheet layer and a sealing portion that covers and seals the fibrous heat insulating material layer.

Brief Description of the Drawings

[0006] [[ID=五十]] [[ID=五十一]] [Figure 1] [[ID=五十二]]It is a perspective view of the heat insulating material 1 of the first embodiment. [[ID=五十三]] [[ID=五十四]] [Figure 2]This is a perspective view illustrating the laminated structure of the thermal insulation material 1 of the first embodiment. [Figure 3] This is a longitudinal cross-sectional view of the vicinity of the edge of the thermal insulation material 1 of the first embodiment. [Figure 4] This diagram illustrates a method for verifying the thermal insulation material 1 of the first embodiment. [Figure 5] This graph shows the temperature measurement results for the verification of the first embodiment. [Figure 6] This graph shows the power consumption measurement results for the verification of the first embodiment. [Figure 7] This is a perspective view showing the foldable insulation material 261 of the second embodiment. [Figure 8] This is a longitudinal cross-sectional view of the vicinity of a continuous portion 262 of adjacent insulation material 201 in the second embodiment. [Figure 9] This is a perspective view of the insulated box 265 of the second embodiment. [Figure 10] This is a vertical cross-sectional view (corresponding to Figure 3) illustrating the laminated structure of the insulation material 301A in the third embodiment. [Figure 11] This is a perspective view of the thermal insulation material 401 of the fourth embodiment. [Modes for carrying out the invention]

[0007] Embodiments of the present invention will be described below with reference to the drawings and other documents. (First Embodiment) Figure 1 is a perspective view of the thermal insulation material 1 of the first embodiment. Figure 2 is a perspective view illustrating the laminated structure of the thermal insulation material 1 in the first embodiment. Figure 2(A) shows the state in which the first bubble sheet layer 10, the glass wool layer 5, and the second bubble sheet layer 20 are laminated. Figure 2(B) shows the first bubble sheet layer 10, the glass wool layer 5, and the second bubble sheet layer 20 decomposed in the thickness direction Z. Figure 3 is a longitudinal cross-sectional view of the vicinity of the edge of the thermal insulation material 1 of the first embodiment. In the embodiments and drawings, an XYZ Cartesian coordinate system is used as appropriate for explanation. Each direction is defined for the sake of explanation. As shown in Figure 1, this coordinate system represents the left-right direction X (left side X1, right side X2), the vertical direction Y (front side Y1, rear side Y2), and the thickness direction Z (bottom side Z1, top side Z2) of the thermal insulation material 1. The thickness of each component is exaggerated as appropriate in the illustration. The thickness direction Z is the lamination direction of each layer.

[0008] As shown in Figures 1 to 3, the insulation material 1 comprises a glass wool layer 5, a first bubble sheet layer 10 (first film), a second bubble sheet layer 20 (second film), and a sealed section 30. The first bubble sheet layer 10, the glass wool layer 5, and the second bubble sheet layer 20 are laminated in this order from the lower side Z1 to the upper side Z2. In other words, the first bubble sheet layer 10 is laminated on the lower side Z1 (one side) of the glass wool layer 5, and the second bubble sheet layer 20 is laminated on the upper side Z2 (the other side) of the glass wool layer 5. The insulation material 1 has a symmetrical structure in the thickness direction Z. Therefore, the layer configuration of the first bubble sheet layer 10 and the second bubble sheet layer 20 is also symmetrical in the thickness direction Z; in other words, the second bubble sheet layer 20 has a structure that is like the first bubble sheet layer 10 with the front and back sides reversed.

[0009] (Glass wool layer 5) The glass wool layer 5 is a layer in which glass wool, which is made of glass fibers in a cotton-like form, is bonded together with a binder, and is a rectangular (square or rectangular) plate-shaped member.

[0010] (First bubble sheet layer 10) When viewed from the thickness direction Z, the shape of the first bubble sheet layer 10 is rectangular, slightly larger than the glass wool layer 5, in order to provide a heat-sealed portion 31 (described later) around its entire circumference. The edges of the first bubble sheet layer 10 protrude outward from the edges of the glass wool layer 5 by, for example, about 10 mm. The first bubble sheet layer 10 is formed by laminating a cap film 11, a back film 12, and a metal thin film layer 13 in this order from the upper side Z2 to the lower side Z1. These layers are joined together by heat welding or the like. The cap film 11 and the back film 12 are resin films such as polyethylene, polypropylene, and polyethylene terephthalate, for example. The laminate in which the cap film 11 and the back film 12 are laminated can be used as a bubble cushioning material (see, for example, Japanese Patent Application Laid-Open No. 07-016965) only with this laminate.

[0011] The cap film 11 includes a plurality of convex caps 11a that bulge in a hollow shape. The back film 12 encloses air in the plurality of caps 11a by being laminated on the cap film 11. The first bubble sheet layer 10 is laminated on the cap film 11 such that the cap film 11 faces the glass wool layer 5 side and the back film 12 faces the surface layer side.

[0012] The metal thin film layer 13 is a thin film layer such as a metal foil of aluminum or the like. The metal thin film layer 13 is laminated on the surface of the back film 12 opposite to the cap film 11 side. Therefore, the metal thin film layer 13 is laminated on the outermost surface of the heat insulating material 1. For the metal thin film layer 13, a film obtained by laminating a resin film such as polyethylene on a metal thin film can be used. The metal thin film layer 13 can be joined to the back film 12 by heat welding or the like of the resin film to the back film 12. Note that the metal thin film layer 13 may be formed not by a metal foil but by, for example, vapor-depositing a metal on a resin film, or by directly vapor-depositing a metal on the back film 12.

[0013] (The second bubble sheet layer 20) The second bubble sheet layer 20 has a configuration symmetric to the first bubble sheet layer 10 in the thickness direction Z. That is, in the second bubble sheet layer 20, a cap film 21, a back film 22, and a metal thin film layer 23 are laminated in this order from the lower side Z1 to the upper side Z2.

[0014] (Sealed part 30) The sealed portion 30 is the part (covering portion) that covers and seals the entire glass wool layer 5. In this embodiment, the first bubble sheet layer 10 and the second bubble sheet layer 20 function as the sealed portion 30. In other words, since the outer dimensions of the first bubble sheet layer 10 and the second bubble sheet layer 20 are larger than the outer dimensions of the glass wool layer 5, the first bubble sheet layer 10 and the second bubble sheet layer 20 cover the bottom and top surfaces of the glass wool layer 5. Furthermore, the first bubble sheet layer 10 and the second bubble sheet layer 20 are provided with heat-sealed portions 31. The heat-welded portion 31 is the portion where the layers are heat-welded together over the entire circumference of the first bubble sheet layer 10 and the second bubble sheet layer 20, in the area outside the glass wool layer 5, when viewed from the thickness direction Z. The heat-welded portion 31 is provided over the entire circumference of the first bubble sheet layer 10 and the second bubble sheet layer 20. As a result, the first bubble sheet layer 10 and the second bubble sheet layer 20 can be sealed so that the air contained in the glass wool layer 5 does not leak to the outside, and so that the fibers that have fallen out of the glass wool layer 5 do not come out to the outside. Furthermore, the sealed section 30 prevents moisture from entering the glass wool layer 5 from the outside and also prevents direct exposure of the glass wool layer 5 to ultraviolet rays (such as exposure caused by sunlight). As a result, the sealed section 30 can suppress the deterioration of the binder that adheres the glass fibers of the glass wool layer 5 together.

[0015] With the above configuration, insulation material 1 has good thermal insulation properties, as explained below. (1) Since the insulating material 1 has a thin metal film layer 13 on the entire surface of its bottom and top surfaces, it can efficiently reflect radiant heat (electromagnetic waves) from the surroundings, thereby improving its heat insulation properties. For this reason, by arranging the insulating material 1 to surround an object (such as packaging), it is possible to suppress heat from escaping from the object to the outside, and also to suppress heat from being transferred from the outside to the object.

[0016] (2) The first bubble sheet layer 10 has air sealed inside the cap 11a. In addition, since the heat-sealed portion 31 is provided around the entire circumference of the first bubble sheet layer 10 and the second bubble sheet layer 20, the space outside the cap 11a is also separated from the outside air and sealed. As a result, the first bubble sheet layer 10 has an insulating effect because air is sealed inside. The second bubble sheet layer 20 also has an insulating effect in a similar manner. (3) In addition to the thermal insulation properties of the glass wool layer 5 itself, the glass wool layer 5 is completely sealed while sandwiched between the first bubble sheet layer 10 and the second bubble sheet layer 20, thus providing thermal insulation due to the sealed air.

[0017] (Verification of the thermal insulation effect of insulation material 1) Figure 4 is a diagram illustrating the verification method for the thermal insulation material 1 of the first embodiment. Figure 5 is a graph showing the temperature measurement results for the verification of the first embodiment. Figure 6 is a graph showing the power consumption measurement results for the verification of the first embodiment. The thermal insulation effect of insulation material 1 was verified by the following experiment. As shown in Figure 4, an insulating material 1 was placed between the main body 50a and the blanket 50b of the electric kotatsu 50, and the temperature (air temperature) change over time was measured using thermometers 51-53 for the interior (temperature inside the kotatsu), near the top surface (near the top surface of the top plate 50c), and outside (the room in which the electric kotatsu 50 was installed). The internal temperature thermometer 51 was positioned above the floor to reduce the influence of the floor temperature. The thermometer 52 near the top surface was surrounded by an enclosure to reduce the influence of the external temperature. The room in which the electric kotatsu 50 was installed was a closed space, and the external temperature was kept nearly constant by the air conditioning system 55. Additionally, the power consumption of the electric kotatsu (heated table) was measured using a power meter. Glass wool layer 5 has a density of 96 kg / m³. 2 12mm thick glass wool was used. Insulation material 1 had a total thickness of 17mm and a total weight of 1272g / m². 2 The thermal conductivity in the thickness direction Z is 0.03319 m 2 It was K / W. Similarly, temperature and power consumption were measured in the configuration without insulation material 1, and the measurement results for both the presence and absence of insulation material 1 were compared.

[0018] (Internal temperature of electric kotatsu 50) As shown in Figure 5, the internal temperature tended to be higher with insulation than without. The temperature difference between the two after 180 minutes was 2.0°C (42.8°C-40.8°C). The external temperature difference after 180 minutes was approximately 1°C lower with insulation than without. Taking this temperature difference into account, the temperature with insulation was more than 2.0°C higher than without insulation. This confirmed that the insulation 1 improved the heat retention of the electric kotatsu 50.

[0019] (Temperature near the top surface) The temperature near the top surface tended to be lower with insulation than without. The temperature difference between the two after 180 minutes was 6.5°C. Note that at the start of the test, the temperature near the top surface temporarily decreased, which was due to the temperature of the top plate (50°C) not being sufficiently warmed up. This confirmed that the internal temperature was insulated by the insulating material 1, meaning that heat was shielded by the thermal resistance of the insulating material 1.

[0020] (Number of times heater 50d is started) As shown in Figure 6, the number of times heater 50d was started during the 180-minute test period was 4 times with insulation and 7 times without insulation, with the former being less frequent. Furthermore, in the case with insulation, the heater 50d was activated 0 times during the latter half of the test (after 140 minutes of the test period). This is thought to be due to the following reason: The temperature near the top surface tended to rise gradually as the test period progressed. As a result, in the latter half of the test, the top plate 50c became sufficiently warm, resulting in a small temperature difference between the internal and external temperatures. In this state, the heat escaping from the inside of the kotatsu to the outside is sufficiently reduced due to the action of insulation 1. Therefore, in the latter half of the test with insulation, the change in internal temperature was small, and it is thought that the heater 50d did not activate. Furthermore, the total power consumption over 180 minutes was 0.58 kWh with insulation and 0.60 kWh without insulation, meaning the former consumed less power.

[0021] As described above, the thermal insulation material 1 of this embodiment is constructed by laminating and sealing a glass wool layer 5 and bubble sheet layers 10 and 20. Therefore, the thermal insulation material 1 is easy to handle because it suppresses the dispersion of glass fibers that escape from the glass wool layer 5 to the outside, and it can also improve the thermal insulation effect. Furthermore, it is possible to suppress the deterioration of the glass wool layer 5 by preventing moisture from entering the glass wool layer 5 from the outside of the thermal insulation material 1 and by suppressing the exposure of the glass wool layer 5 to ultraviolet rays. Furthermore, since the insulation material 1 includes bubble sheet layers 10 and 20, it also functions as a cushioning material.

[0022] (Second Embodiment) Next, a second embodiment of the present invention will be described. In the following descriptions and drawings, parts that perform similar functions between each embodiment and other embodiments will be given the same names as appropriate, and the same reference numerals or the same reference numerals at the end (last two digits) will be used as appropriate to omit redundant explanations as necessary. Figure 7 is a perspective view showing the foldable insulation material 261 of the second embodiment. Figure 8 is a longitudinal cross-sectional view of the vicinity of the continuous portion 262 of adjacent insulation material 201 in the second embodiment. Figure 9 is a perspective view of the insulated box 265 of the second embodiment. Figure 9(A) is a diagram illustrating the assembly process of the insulated box 265. Figure 9(B) shows the insulation material 201D in the open state, with the insulated box 265 open at the top. Figure 9(C) shows the insulated box 265 with the lid covered with the insulating material 201D.

[0023] As shown in Figure 7(A), the foldable insulation material 261 is made up of multiple insulation materials 201 arranged in a continuous pattern both vertically and horizontally. The lamination configuration of each insulation material 201 is the same as in the first embodiment. The shape of the insulation material 201 when viewed from the thickness direction Z is square, but is not limited to this, and may be rectangular or the like. As shown in Figure 8, adjacent insulation materials 201 are connected by a continuous section 262, which is a bubble sheet layer 10, 20. The continuous section 262 is the part where the glass wool layer 5 is not present. A heat-sealed section 31 is provided in the continuous section 262. Figure 8 shows an example where the two heat-sealed sections 31 of adjacent insulation materials 201 are separated, but they may be connected.

[0024] The continuous section 262 lacks the glass wool layer 5 and is composed of the first bubble sheet layer 10 and the second bubble sheet layer 20, thus possessing sufficient flexibility. Therefore, adjacent insulation materials 201 can be folded and opened / closed using the continuous section 262 as a hinge. This makes the foldable insulation material 261 easy to store and transport. Furthermore, when the foldable insulation material 261 is used as packaging material, it can be folded to wrap around the packaged object or wrapped around the packaged object.

[0025] The foldable insulation material 261 shown in Figure 7(B) consists of a total of six insulation materials 201A to 201F connected in a row, with four insulation materials 201A to 201D connected in the vertical direction Y, and three insulation materials 201E, 201B, and 201F connected in the horizontal direction X. As shown in Figures 7(B) and 9(A), the foldable insulation material 261 can be transformed into a box shape with an open upper side Z2 by folding the insulation material 201 that is continuous with the insulation material 201 at the continuous portion 262. Figure 9 shows an example in which the foldable insulation material 261 is used as the interior lining of a thermal insulation box 265. As shown in Figure 9, the insulated box 265 comprises an outer box 266 and a foldable insulation material 261. The outer box 266 is a box with an opening at the top Z2. The internal dimensions of the outer box 266 are just large enough to accommodate the foldable insulation material 261 that has been deformed into a box shape. Therefore, the insulation material 201 of the foldable insulation material 261 is arranged along the inner wall of the outer box 266. A lid may be provided on the top of the outer box 266. As shown in Figure 9(C), after the contents of the insulated box 265 have been placed inside, the insulation material 201D, which is placed on top of the foldable insulation material 261, should be closed. The insulated box 265 can also be used as a transport box, cooler box, etc. Furthermore, the insulated box 265 can be converted into an insulated bag by using a bag instead of the outer box 266. This insulated bag can then be used as an insulated bag, etc.

[0026] (Third embodiment) Next, a third embodiment of the present invention will be described. Figure 10 is a vertical cross-sectional view (corresponding to Figure 3) illustrating the laminated structure of the thermal insulation material 301 in the third embodiment. As shown in Figure 10, instead of a second bubble sheet layer, a flat sheet material such as polyethylene resin sheet 320 (second film) is laminated on the top layer of the insulation material 301. The resin sheet 320, like the second bubble sheet layer 20, has a thin metal film layer 323 laminated on it. Furthermore, the outer periphery of the first bubble sheet layer 10 and the resin sheet 320 are joined by a heat-sealed portion 431, similar to the embodiment described above. Since the thermal insulation material 301 of this embodiment comprises only one layer of the first bubble sheet layer 10 as a bubble sheet, it is less expensive and can be made thinner compared to the above embodiment. Furthermore, when the thermal insulation material 301 is used for packaging objects, it is preferable to have the first bubble sheet layer 10 facing the object, from the viewpoint of its function as a cushioning material.

[0027] (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. Figure 11 is a perspective view of the thermal insulation material 401 of the fourth embodiment. As shown in Figure 11(A), the first bubble sheet layer 10, the glass wool layer 5, and the second bubble sheet layer 20 are overlapped and then sealed in a bag 430 (sealed section). The bag 430 is made of a heat-sealable resin (such as polyethylene). As shown in Figure 11(B), the opening of the bag 430 is then heat-sealed to form a heat-sealed section 431. This creates the thermal insulation material 401. The lamination configuration of the first bubble sheet layer 10, the glass wool layer 5, and the second bubble sheet layer 20 is the same as in the above embodiment. Furthermore, since the glass wool layer 5 is sealed by the bag 430, the same heat retention performance as in the above embodiment can be expected, and the scattering of detached glass fibers to the outside can be suppressed.

[0028] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above. Various modifications and changes are possible, such as the modified forms described later, and these are also within the technical scope of the present invention. Furthermore, the effects described in the embodiments are merely a list of the most preferred effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. Note that the configurations of the embodiments described above and the modified forms described later can be used in part or in combination as appropriate, but a detailed explanation is omitted.

[0029] (Transformed form) (1) In the embodiment, the fibrous insulation layer was shown to be a glass wool layer, but it is not limited to this. The fibrous insulation layer may be made of inorganic fibrous material, such as rock wool in addition to glass wool. Alternatively, the fibrous insulation layer may be made of organic fibrous material (such as polyester wool) or wood fiber insulation. Even with these fibrous insulation layers, effects such as suppressing fiber dissipation in sealed areas and inhibiting binder deterioration can be expected.

[0030] (2) In the embodiment, an example was shown in which the thermal insulation material has metal thin film layers on both sides (one side and the other side), but it is not limited to this. The thermal insulation material does not have to have metal thin film layers, and the thermal insulation material may have metal thin film layers on only one side. Furthermore, the metal thin film layer does not have to be welded to a back film or the like; it may be a metal foil itself, a film on which a metal thin film has been formed, or the like. In this case, a metal foil or the like with an outer shape similar in size to the outer shape of the glass wool layer when viewed from the thickness direction Z may be placed on the glass wool layer and then sandwiched and sealed between upper and lower bubble sheet layers as in the first embodiment, or it may be sealed in a bag as in the fourth embodiment.

[0031] (3) In the embodiment, the bubble sheet layer was shown to be a sufficiently soft material for cushioning objects (such as packaged items), but it is not limited to this. The bubble sheet layer may be a sufficiently rigid bubble board or the like. In this case, the insulating material can be used as a sorting board when transporting objects. (4) In the embodiment, the bubble sheet layer is shown as having a two-layer structure consisting of a cap film and a back film, but it is not limited to this. The bubble sheet layer may have a structure of three or more layers. In this case, a flat film (also called a liner film, etc.) may be laminated on the top surface side of the cap of the cap film. [Explanation of Symbols]

[0032] 1, 201, 201A~201F, 301, 401: Insulation material 5: Glass wool layer 10: First bubble sheet layer 11,21: Cap film 12,22: Back film 13,23,323: Metal thin film layer 20: Second bubble sheet layer 30: Sealed part 31,431: Heat welded part 261: Foldable insulation material 262: Continuous section 265: Heat insulation box 320: Resin sheet 430: Bag body

Claims

1. A fibrous insulation layer formed by fibrous insulation material, A bubble sheet layer having a cap film having multiple caps and laminated on the fibrous insulation layer, and a back film that seals air into the multiple caps by being laminated on the cap film, A sealed portion that covers and seals the aforementioned fibrous insulation layer An insulating material that has the following properties.

2. The aforementioned sealed portion is A first film laminated on one side of the aforementioned fibrous insulation layer, A second film laminated on the other side of the aforementioned fibrous insulation layer, When viewed from the stacking direction, the first film and the second film are heat-welded together in an area outside the fibrous insulation layer, and the heat-welded portion is provided. The bubble sheet layer is the first film. The thermal insulation material according to feature 1.

3. The aforementioned bubble sheet layer is A first bubble sheet layer laminated on one side of the aforementioned fibrous insulation layer, The fibrous insulation layer comprises a second bubble sheet layer laminated on the other side of the aforementioned fibrous insulation layer, The first bubble sheet layer is the first film, The second bubble sheet layer is the second film. The thermal insulation material according to feature 2.

4. The fibrous insulation layer comprises at least one metal thin film layer laminated on one side and the other side of the fibrous insulation layer. The thermal insulation material according to any one of features 1 to 3.

5. The aforementioned metal thin film layer is the side of the back film opposite to the cap film side, and is laminated on the outermost layer of the thermal insulation material. The thermal insulation material according to feature 4.

6. A foldable thermal insulation material comprising a plurality of thermal insulation materials according to any one of claims 1 to 3, A first film laminated on one side of multiple fibrous insulation layers, The invention comprises a second film laminated on the other side of a plurality of fibrous insulation layers, The insulation material, when viewed from the direction of layering, It is square or rectangular in shape. Multiple layers of fibrous insulation material are arranged vertically and horizontally. The first film and the second film are heat-welded together between adjacent fibrous insulation layers, and the heat-welded portion is provided. Adjacent insulation materials can be opened and closed using the first and second films between them as a hinge. A foldable insulation material characterized by the following features.

Images