JP2007092776A - Heat insulating material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a heat insulating material capable of being independently and easily arranged on a case body having an irregular shape, reducing inflow/outflow of heat from a butting face, and reducing cost, and a manufacturing method for the heat insulating material. <P>SOLUTION: This heat insulating material comprises a core material 2 comprising glass wool, an inner pack 3 as a packaging body capable of storing and holding the core material 2 in the compressed state, and a barrier material 4 as a coating body. Part of the core material 2 is removed to form a linear thin part 13 in the core material 2. Since the thin part 13 thinner than other portions is formed in the core material 2 by removing part of the core material 2, the completed vacuum heat insulating material 1 can be easily bent by using the thin part 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat insulating material in which a shaped body in which a core material is housed and held in a package is housed in an outer shell, and a method for manufacturing the heat insulating material.

  In recent years, consumer electronics products such as refrigerators and cooking appliances are required to save energy. In order to meet such demands, high-performance vacuum insulation is used inside the main body of home appliances.

  As disclosed in, for example, Patent Document 1, the vacuum heat insulating material includes glass wool serving as a core material and an outer casing that wraps the glass wool in a vacuum state. The outer covering here may be any material as long as it has gas barrier properties and can accommodate the core material and maintain the inside in a vacuum, but preferably a plastic film having a metal such as aluminum deposited on its surface. A laminated bag such as is used.

On the other hand, glass wool used as a core material has a small bulk specific gravity (density), and cannot be stored in the bag-shaped outer casing at the time of production as it is, or finally obtains a plate-shaped heat insulating material. I can't. In order to cope with such a problem, the applicant of the present application has proposed a shaped body of a heat insulating material in which a core material is housed in a sheet material and held in a compressed state in Patent Document 2. With such a shaped body, it is not necessary to apply a binder to the core material or perform a baking treatment, and a shaped body having a stable fixed shape can be obtained in a short time.
JP 2003-269689 A JP 2005-207556 A

  By the way, even if it is a box-shaped home appliance such as a refrigerator, the place where the above-described vacuum heat insulating material can be applied is limited, and the vacuum heat insulating material is applied as it is due to the influence of other parts. It may not be attached.

  Furthermore, in the case of home appliances that form a round and cylindrical housing, it can be used by adding multiple subdivided vacuum insulation materials within the housing, but the butt surface increases between the insulation materials and heat is generated from there. Therefore, the desired heat insulation effect cannot be obtained. In addition, since the number of heat insulating materials used increases, there is a problem that causes an increase in cost.

  Therefore, in view of the above problems, the present invention can be easily and independently arranged even for a deformed casing, and can reduce the cost of heat from the abutting surface and can reduce costs. It aims at providing the manufacturing method.

  In the heat insulating material according to claim 1 of the present invention, since a thin portion is formed in the core material by removing a part of the core material, the completed heat insulating material can be easily bent using the thin wall portion. it can. Therefore, it is possible to easily arrange a single heat insulating material for an irregularly shaped casing such as a cylinder, and it is not necessary to prepare a plurality of heat insulating materials. Cost reduction can be realized by reducing the number of sheets.

  Furthermore, if the packaging body stores and holds the core material in a compressed state, there is no need to apply a binder to the core material or perform a baking treatment, and the core material can be held in a stable and fixed shape in a short time. In addition, nothing is added to the core material itself including the binder, and the extremely excellent heat insulating performance as the core material itself can be maintained as it is.

  In the heat insulating material according to claim 2 of the present invention, in the same process as the outer periphery cutting that determines the outer shape of the core material, for example, a thin blade can be formed by inserting a cutting blade by a cutting means, thereby reducing work steps. Can do.

In the heat insulating material according to claim 3 of the present invention, the width W of the thin portion formed by removing a part of the core material is the depth (T ₀ -T ₁ ) of the portion from which a part of the core material is removed. The dimension of the thin portion relative to the core material so that it is twice or more, or the thickness T ₁ of the thin portion exceeds 0 and is not more than 3/4 of the thickness T ₀ of the core material other than the thin portion. If it is prescribed | regulated, it will become possible to bend a heat insulating material comfortably in a thin part.

  In the method for manufacturing a heat insulating material according to claim 4 of the present invention, a thinned portion (thin wall portion) is formed in a part of the core material. Therefore, the completed heat insulating material is easily folded using the thin wall portion. Can be bent. Therefore, it is possible to easily arrange a single heat insulating material for an irregularly shaped casing such as a cylinder, and it is not necessary to prepare a plurality of heat insulating materials. Cost reduction can be realized by reducing the number of sheets.

  Further, since the core material is stored and held in a compressed state, there is no need to apply a binder to the core material or to perform a baking treatment, and the core material can be held in a stable and fixed shape in a short time. In addition, nothing is added to the core material itself including the binder, and the extremely excellent heat insulating performance as the core material itself can be maintained as it is.

  In the first and fourth aspects of the present invention, it is possible to easily arrange an irregularly shaped casing alone, to reduce the amount of heat entering and exiting the butted surfaces, and to reduce the cost. Further, the core material can be held in a stable and fixed shape in a short time, and the heat insulating performance as a single core material can be maintained as it is.

  In the invention of claim 2, the work process can be reduced by forming the thin portion in the same process as the outer periphery cutting of the core material.

  In the invention of claim 3, by defining the dimension of the thin portion with respect to the core material, the heat insulating material can be bent without difficulty in the thin portion.

  Hereinafter, preferred embodiments of the vacuum heat insulating material in the present invention will be described with reference to the accompanying drawings.

  First, the structure in the completion state of a heat insulating material is demonstrated based on FIG. In the figure, reference numeral 1 denotes a flat vacuum heat insulating material disposed in, for example, a refrigerator or a cooking appliance, which includes a core material 2 made of a heat insulating material in which fibrous glass wool rich in elasticity is laminated, The inner pack 3 is a sheet material for storing the core material 2, and the core material 2 and the inner pack 3 are configured by a barrier material 4 as an outer covering body that is packaged in a vacuum state. The core material 2 here does not contain a conventional inorganic binder or organic binder, and is composed of glass wool alone. The barrier material 4 before vacuum sealing is formed in a bag shape having only one side opened, and a shaped body 5 in which the core material 2 is stored in a compressed state in the inner pack 3 from this opening (not shown). (See FIG. 7) is inserted and sealed. The barrier material 4 may be any material as long as it has a gas barrier property and can accommodate the core material 2 and the inner pack 3 and maintain the inside in a vacuum. A laminated bag such as a film is used.

  Next, the manufacturing process of the said vacuum heat insulating material 1 is demonstrated, referring also FIGS. FIG. 2 is a cross-sectional view showing a state in which the outer periphery of the core material 2 is cut. In the cutting process of the core material 2 which is the first process, the core material 2 is adjusted to a predetermined size so that the outer shape of the core material 2 becomes, for example, a rectangular shape by a blade as a cutting means provided in a mold (not shown). Cut. At the same time, a blade (cutting blade) as a cutting means provided in advance in a place where the vacuum heat insulating material 1 is finally bent is moved to the middle of the core material 2 partway in the thickness direction. Make a crossed cut into. Reference numeral 11 in FIG. 2 denotes a cut portion formed in the core material 2 by the cutting blade.

  When the cutting process of the core material 2 is completed, a drying process of the core material 2 is performed thereafter. Next, as shown in FIG. 3, a part of the core material 2 separated by the cut portion 11 (the separation part 12 is separated). ) Is removed from the core material 2. Thereby, the core member 2 is formed with a thinned portion 13 that is thinner than other portions, and a groove-like concave portion 14 is formed in a portion where the cut-off portion 12 is removed. In addition, the said drying process is performed in order to remove the water | moisture content adhering to a core material, and to remove a deposit | attachment in the case of the vacuum drawing mentioned later.

  FIG. 4 shows a state in which the core material 2 before compression is wrapped with the inner pack 3. The inner pack 3 as a package surrounding the core material 2 is a material that can maintain sealing performance, heat resistance, and durability (hardness to cut) in each manufacturing process until the shaped body 5 described later is inserted into the barrier material 4. Is selected. Specifically, it is preferable to select a polypropylene resin or a polyethylene resin that satisfies these requirements as the material of the inner pack 3. Further, the thickness of the inner pack 3 is the workability when the inner pack 3 is subsequently formed into a bag shape, the workability when the inside of the inner pack 3 is vacuum-depressed, and the opening of the inner pack 3 is sealed, etc. In consideration of the above, a thickness of 0.05 mm or less is preferable.

  First, in the step of covering the core material 2 with the inner pack 3, the core material 2 is placed on one side portion 3A of the inner pack 3 that is cut into a predetermined size, and the intermediate portion 3B is placed as shown in FIG. Folded so that the one side 3A and the other side 3C of the inner pack 3 are opposed to each other with the core material 2 interposed therebetween.

  Next, a step of forming the inner pack 3 into a bag shape is performed. Here, after compressing the core material 2 with a press or the like (not shown), the one side portion 3A of the inner pack 3 and the ear portions 3D on the left and right sides of the other side portion 3C are overlapped (FIG. 5), What is necessary is just to seal the ear | edge part 3D formed in 3 A of 1 side 3 and the other side part 3C by heat sealing (FIG. 6). In FIG. 6, the ear portions 3 </ b> D on the left and right sides of the inner pack 3 are sealed, and the inner pack 3 is formed in a bag shape in which only one side on the front side is opened.

  From the state of FIG. 5, the ear 3 </ b> D on the left side of the inner pack 3 and another ear 3 </ b> D on the front side are sealed (in this case, an opening is formed on the right side of the inner pack 3. ), The ear 3D on the right side of the inner pack 3 and another ear 3D on the front side are sealed (in this case, an opening is formed on the left side of the inner pack 3). Good. Further, the reason for sealing the ear portion 3D while compressing the core material 2 is that, in the state of the core material 2 before compression, depending on the thickness of the core material 2, the one side portion 3A and the other side portion 3C of the inner pack 3 This is because it is difficult to overlap each ear 3D.

  Next, the process proceeds to a step of forming the core material 2 into a shaped body. Here, after compressing the core material 2 to a fixed shape using the above-mentioned press machine, the opening left to vacuum-depress the inside of the inner pack 3 is heat-sealed immediately after the pressure reduction, so that the compression is achieved. A shaped body 5 in which the core material 2 that maintains the state is housed in the inner pack 3 can be obtained. The opening can be easily sealed by sealing the ear portions 3D on the front sides of the one side portion 3A and the other side portion 3C of the inner pack 3 in the same manner as described above. As shown in FIG. 7, when all the opening end portions of the inner pack 3 are sealed, the core material 2 housed in the inner pack 3 is held in a stable compressed state. The body 5 has, for example, vertical, horizontal, and thickness dimensions of about 1400 mm, 480 mm, and 12.5 to 1 mm, respectively, and can be easily stored in the bag-like barrier material 4. In addition, the number here is an example to the last, and the shaping body 5 other than the said dimension can also be manufactured.

  In this embodiment, before the core material 2 is compressed to a fixed shape, the opening end of the inner pack 3 other than the vacuum decompression opening is sealed. From the state shown in FIG. After compressing the core material 2 to a fixed shape, all the open end portions of the inner pack 3 may be sealed in order or at a time to obtain a desired shaped body 5.

  As described above, in a series of manufacturing steps until the shaped body 5 is obtained, in order to maintain the shape of the compressed core material 2, a binder is applied to the core material 2 or the compressed core material 2 is left for a predetermined time. There is no need to fire. That is, in this embodiment, after the core material 2 is covered with the inner pack 3, the core material 2 is compressed, the inside of the inner pack 3 is vacuum depressurized, the opening end of the inner pack 3 is sealed, and the inner pack 3 By simply storing and holding the core material 2 in a compressed state, the shaped body 5 having a stable shape can be obtained in a very short time. Further, in addition to the press machine for compressing the core material 2, only the equipment for sealing the opening end portion of the inner pack 3 may be used, and the productivity can be remarkably improved. No energy loss due to heat occurs. In addition, nothing is added to the core material 2 alone, and the extremely excellent heat insulation performance of the glass wool alone can be maintained as it is simply by covering the periphery with the inner pack 3.

  The shaped body 5 thus obtained is inserted into the bag-shaped barrier material 4 having gas barrier properties from the opening end (not shown) in the manufacturing process of the vacuum heat insulating material 1 as the next heat insulating material, and then the vacuum chamber The vacuum heat insulating material 1 shown in FIG. 1 is formed by being vacuum-evacuated and heat-sealing and sealing the opening end of the barrier material 4. In addition, in order to make it easy to insert the shaping body 5 into the barrier material 4, the ear portion 3 </ b> D of the inner pack 3 outside the core material 2 may be folded back. Moreover, since the function as the inner pack 3 becomes unnecessary after the shaping body 5 is inserted into the barrier material 4, the end portion of the inner pack 3 may be cut and discarded. In this case, the core material 2 temporarily expands and recovers inside the barrier material 4, but the core material 2 is compressed again by the subsequent vacuuming, so that the desired vacuum heat insulating material 1 can be finally obtained. it can.

  FIG. 8 shows an example of use of the completed vacuum heat insulating material 1. In the same figure, 4A is the sealing part by the heat seal formed in the opening edge part of the barrier material 4 after inserting the said shaping body 5 in the barrier material 4. FIG. The vacuum heat insulating material 1 here can be used by simply folding the thin portion 13 in accordance with the housing shape of the home appliance. Of course, it is also possible to use the plate-shaped vacuum heat insulating material 1 as it is without bending the thin portion 13.

  FIG. 9 shows an example in which a plurality of thin portions 13 are formed on the core material 2. A plurality of the thin-walled portions 13 are arranged at predetermined intervals so as to cross the front-rear direction of the core material 2, and the portion of the thin-walled portion 13 is bent in the same manner as in FIG. Obtainable. Therefore, in this case, for example, a single vacuum heat insulating material 1 can be attached to a casing of a household electrical appliance having a cylindrical shape.

FIG. 10 shows the dimensions of each part of the core material 2. In the figure, W is the width of the recess 14 formed by removing the cut-off portion 12, and this corresponds to the width of the thin portion 13. Further, T ₁ is the thickness of the thin portion 13 remaining as a part of the core material 2, and T ₀ is the thickness other than the thin portion 13 of the core material 2. In this case, the width W removed from the core material 2 as the separation portion 12 (that is, the width of the thin-walled portion 13 remaining as a part of the core material 2) satisfies the relationship of (W / 2) ≧ (T ₀ −T ₁ ). Like that. In this way, the width W of the thin-walled portion 13 is ensured to be twice or more the depth (T ₀ -T ₁ ) of the concave portion 14 from which a part of the core material 2 has been removed. Can be folded.

Further, the thickness T ₀ of the thinned portion (thin wall portion 13) of the core material 2 is set so as to satisfy the relationship of 0 <T ₁ ≦ (3/4) T ₀ . By doing so, the thickness T ₁ of the thin portion 13 exceeds 0 with respect to the thickness T ₀ of the core material 2 and becomes 3/4 or less, so that the thin portion 13 does not become unnecessarily thick and is vacuum insulated. The material 1 can be bent without difficulty.

  Incidentally, the shaped body 5 only needs to be able to temporarily compress and hold the core material 2 in a fixed shape by the inner pack 3 until it is inserted into the barrier material 4 during the manufacture of the vacuum heat insulating material 1. On the other hand, the gas barrier property and sealing property like the barrier material 4 are not required. Therefore, the shaped body 5 according to the present embodiment has an advantage that the material of the inner pack 3 can have a certain degree of versatility.

  As described above, the vacuum heat insulating material 1 in this embodiment includes the core material 2 made of, for example, glass wool, the inner pack 3 as a package that can store and hold the core material 2 in a compressed state, and the inner pack 3 with the core. It consists of a barrier material 4 as a covering body that houses a shaped body 5 containing a material 2 inside, and a part of the core material 2 is removed to form a thin-walled portion 13 such as a line on the core material 2. ing.

  In this case, a part of the core material 2 is removed, and a thin wall portion 13 having a thickness thinner than other portions is formed on the core material 2, and thus the vacuum heat insulating material completed using the thin wall portion 13. 1 can be easily bent.

  Moreover, the manufacturing method of the vacuum heat insulating material 1 in a present Example cuts the core material 2 of glass wool by a cutting means, such as putting a cutting blade in the part, and after obtaining the drying process of this core material 2, The cutting blade portion is removed to reduce the thickness, and the core material 2 is stored and held in a compressed state, for example, in the inner pack 3 or the like, and the core material is inserted into the barrier material 4 that is the outer cover body and vacuum-sealed. Yes.

  Also in this case, a thinned portion (thin wall portion 13) is formed by removing the cutting edge portion in a part of the core material 2, and thus the vacuum heat insulating material 1 completed using the thin wall portion 13 is provided. Can be folded easily.

  Therefore, according to the structure and the manufacturing method of such a vacuum heat insulating material 1, while being able to arrange | position the single vacuum heat insulating material 1 easily with respect to unusual shaped housings, such as a cylinder, a plurality of vacuum heat insulating materials 1 are not prepared. Therefore, it is possible to reduce the cost by reducing the number of the vacuum heat insulating materials 1 and reducing the number of the heat insulating materials 1 from entering and exiting the butted surfaces. Furthermore, since the core material 2 is stored and held in a compressed state, there is no need to apply a binder to the core material 2 or to perform a baking process, and the core material 2 can be held in a stable and fixed shape in a short time. In addition, nothing is added to the core material 2 itself including the binder, and the extremely excellent heat insulating performance as the core material 2 itself can be maintained as it is.

  That is, in the present embodiment, the single vacuum heat insulating material 1 can be easily arranged even for the irregularly shaped casing, and the heat entry / exit from the abutting surfaces of the vacuum heat insulating materials 1 can be reduced and the cost can be reduced. Can be planned. Further, since the core material 2 can be held in a stable and fixed shape in a short time, the heat insulating performance as the core material 2 alone can be maintained as it is.

  In this embodiment, since the thin portion 13 is formed by inserting the cutting edge simultaneously with the outer peripheral cut of the core material 2, the cutting blade is inserted and thinned in the same process as the outer peripheral cut for determining the outer shape of the core material 2. The part 13 can be formed, and the work process can be reduced.

Further, in this embodiment, when the width and thickness of the thin portion 13 are W and T ₁ and the thickness of the core material 2 other than the thin portion 13 is T ₀ , (W / 2) ≧ (T ₀ The thin portion 13 is formed so that -T ₁ ) or 0 <T ₁ ≦ (3/4) T ₀ holds. In this case, the width W of the thin-walled portion 13 formed by removing a part of the core material 2 is twice or more the depth (T ₀ -T ₁ ) of the part from which a part of the core material 2 is removed. Or the thickness T ₁ of the thin wall portion 13 exceeds 0 and is equal to or less than 3/4 of the thickness T ₀ of the core material 2 other than the thin wall portion 13. If it is prescribed | regulated, it will become possible to bend the vacuum heat insulating material 1 in the thin part 13 without difficulty.

  In addition, in this embodiment, since the thickness of the inner pack 3 is set to 0.05 mm or less, the workability when making the inner pack 3 into a bag shape and the opening of the inner pack 3 left for vacuum decompression are provided. Workability at the time of sealing can be improved.

  In addition, this invention is not limited to the said Example, It can change in the range which does not deviate from the meaning of this invention. For example, the vacuum heat insulating material as the heat insulating material in the present embodiment can be applied to any product other than the refrigerator and the cooking appliance. Further, instead of the inner pack as the sheet material in the embodiment, a bag-like package having only one side opened in advance may be used.

It is a longitudinal cross-sectional view of the vacuum heat insulating material in the preferable Example of this invention. It is a front view of the state which cut the outer periphery of the core material same as the above. It is a perspective view of the state which removed the separation part which is a part of core material from the core material same as the above. It is a perspective view which shows the state which covered the circumference | surroundings of the core material before compression same as the above with the inner pack. It is a longitudinal cross-sectional view of the state which piled up the ear | edge part, compressing a core material same as the above. It is a longitudinal cross-sectional view of the state which formed the seal part in the ear | edge part, compressing a core material same as the above. It is a longitudinal cross-sectional view of the shaping body which shows the state after compressing a core material same as the above. It is a perspective view which shows one example of use of a vacuum heat insulating material same as the above. It is a perspective view which shows another usage example of a vacuum heat insulating material same as the above. It is a principal part sectional drawing showing the dimension of each part of a core material same as the above.

Explanation of symbols

1 Vacuum insulation (insulation)
2 Core material 3 Inner pack (packaging body)
4 Barrier material (cover)
13 Thin section

Claims (4)

  A heat insulating material comprising a core material, a package that can be stored and held, and an outer cover body, wherein a thin portion is formed by removing a part of the core material.   The heat insulating material according to claim 1, wherein the thin portion is formed by a cutting means. (W / 2) ≧ (T ₀ −T ₁ ) or 0 <T ₁ ≦ (3/4) where W and T ₁ are the width and thickness, respectively, and T ₀ is the thickness other than the thin portion. The heat insulating material according to claim 1, wherein T ₀ is established.   A method for manufacturing a heat insulating material, comprising: cutting a core material by a cutting means, obtaining a drying step, thinning and storing and holding in a compressed state, and inserting and sealing the outer shell.

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