JP2005207556A - Fairing body for heat insulating material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fairing body to be stored in the outer package of a heat insulating material, having non-deteriorative and stable heat insulating performance without the need for applying binder thereto or giving firing treatment thereto. <P>SOLUTION: The fairing body 5 for the vacuum heat insulating material 1 comprises a core material 2 of glass wool and an inner pack 3 as a sheet material for storing the core material 2 and holding it in a compressed condition. Since the inner pack 3 stores the core material 2 and holds it in the compressed condition, the fairing body 5 having a stable contour is obtained in a short time without the need for applying the binder to the core material 2 or for giving firing treatment thereto. Problems on productivity or environment are also cleared out. Besides, the core material 2 of the single glass wool maintains extremely improved heat insulating performance, without adding anything thereto. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat insulating material shaped body housed in a vacuum state inside an exterior body having gas barrier properties, for example, and a method for manufacturing the same.

  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 exterior body that wraps the glass wool in a vacuum state. The exterior body here may be any material as long as it has a gas barrier property and can accommodate the core material and maintain the inside in a vacuum, but preferably, for example, a plastic film having a metal such as aluminum deposited on its surface The laminated bag is used.

  By the way, glass wool for a vacuum heat insulating material used as a core material has an excellent heat insulating performance and has an advantage of not generating outgas such as a foam because it has air permeability. However, on the other hand, glass wool has a small bulk specific gravity (density), and as it is, it cannot be stored in the bag-shaped exterior body at the time of manufacture, or cannot finally obtain a plate-shaped heat insulating material.

Therefore, conventionally, after applying an inorganic binder or an organic binder to glass wool, the glass wool is fired in a pressed state, and the binder is solidified to form a shaped body that holds the glass wool in a compressed state. . This shaped body has a fixed shape that can be easily stored in the exterior body, and the workability thereafter can be greatly improved.
JP 2003-269689 A

  Although the above-described shaped body having a higher glass wool density can be greatly improved in handling at the time of production, it has significant problems in productivity and environmental aspects.

  In other words, in terms of the environment, when the binder is applied to the glass wool, the atmosphere in the workplace is deteriorated, and it is necessary to treat unnecessary materials. In addition, a lot of heat is generated during subsequent firing, resulting in energy loss. Further, in terms of productivity, an expensive facility investment is required in each of these processes because an inorganic binder or an organic binder is applied and a shaped body is manufactured by firing treatment. In addition, since an inorganic binder or an organic binder is added as a shaped body, the extremely excellent heat insulation performance of the glass wool itself is deteriorated, and there is a concern that the subsequent baking process takes time.

  Therefore, in view of the above problems, the present invention can obtain a stable shaped body in a short time without applying a binder or baking treatment, and the shaped body of a heat insulating material that does not deteriorate the heat insulating performance, and the production thereof. It aims to provide a method.

  The shaped body of the heat insulating material in claim 1 of the present invention, instead of the conventional inorganic binder or organic binder, the sheet material accommodates the core material and holds it in a compressed state, so that the binder is applied to the core material, There is no need to carry out a firing process, and a stable shaped body having a fixed shape can be obtained in a short time, and productivity and environmental problems can be eliminated. Moreover, since nothing is added to the core material itself, including the binder, it is possible to maintain the excellent heat insulation performance as glass wool alone.

  Moreover, since the thickness of the sheet material is 0.05 mm or less in the shaped body of the heat insulating material according to claim 2 of the present invention, the workability when making the sheet material into a bag shape, and the opening of the sheet material The workability at the time of sealing can be improved.

  In the method for manufacturing the shaped body of the heat insulating material according to claim 3 of the present invention, the sheet material accommodates the core material and holds it in a compressed state instead of the conventional inorganic binder or organic binder, so that the binder is applied to the core material. In addition, it is possible to obtain a stable shaped article having a fixed shape in a short time and to eliminate problems in productivity and the environment. Moreover, since nothing is added to the core material itself, including the binder, it is possible to maintain the excellent heat insulation performance as glass wool alone.

  Since the present invention is as described above, the following effects can be obtained.

  In the first and third aspects of the invention, a stable shaped body can be obtained in a short time without applying a binder or baking treatment, and the heat insulating performance as the shaped body should not be deteriorated. Can do.

  In the invention of claim 2, the workability when the sheet material is made into a bag shape and the workability when the opening of the sheet material is sealed can be improved.

  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 plate vacuum heat insulating material disposed in, for example, a refrigerator or a cooking appliance, which contains a core material 2 made of elastic cotton wool for vacuum heat insulation and accommodates the core material 2. An inner pack 3 as a sheet material to be formed, and a barrier material 4 as an outer package for packaging the core material 2 and the inner pack 3 in a vacuum state. It should be noted that the core material 2 here does not contain a conventional inorganic binder or organic binder and is composed of glass wool alone. On the other hand, the barrier material 4 before packaging 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)). 4) is inserted and sealed. This 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. For example, a plastic in which a metal such as aluminum is deposited on the surface 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 shows a state in which the core material 2 before compression is wrapped with the inner pack 3. The core material 2 here is preferably glass wool for vacuum heat insulating material having a basis weight of 1400 g / m ² and an average fiber diameter of 3.5 μm or less. The thickness t1 of the core material 2 before being covered with the inner pack 3 is about 150 to 250 mm (preferably 200 mm). On the other hand, the inner pack 3 that surrounds the core material 2 is selected from materials that can maintain sealability, heat resistance, and durability (hardness to cut) in each manufacturing process until the shaping body 5 described later is inserted into the barrier material 4. Is done. 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, 0.05 mm or less is selected.

  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 having a rectangular sheet shape cut to a predetermined size, and as shown in FIG. The one side portion 3A and the other side portion 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, as shown in FIG. 3, while compressing the core material 2 with a press or the like (not shown), after overlapping the ear portions 3D on the left and right sides of the one side portion 3A of the inner pack 3 and the other side portion 3C, What is necessary is just to seal the ear | edge part 3D formed in the one side part 3A and the other side part 3C of the inner pack 3 by heat sealing. Thereby, the inner pack 3 is formed in a bag shape in which only the front side is opened. FIG. 4 shows a state in which the seal portion 7 that seals the ear portion 3D is provided in the ear portion 3D.

  In the state of FIG. 4, the ear 3D on the left side of the inner pack 3 and another ear on the front side (not shown) are overlapped, and this portion is sealed with the seal portion 7 (this In this case, an opening is formed on the right side of the inner pack 3.) The ear part 3D on the right side of the inner pack 3 and another ear part on the front side are overlapped, and this part is sealed with the seal part 7. You may stop. In any case, the seal portion 7 is linearly provided from end to end of the ear portion 3D in order to securely seal the entire ear portion 3D. 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, the one side portion 3A and the other side portion 3C of the inner pack 3 depend on the thickness t1 of the core material 2. This is because it is difficult to superimpose the ears 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 regular shape by using the above-described press machine, the opening left to vacuum-depress the inside of the inner pack 3 is sealed, and the compressed state is maintained. A shaped body 5 in which the core material 2 is housed in the inner pack 3 is obtained. The sealing of the opening can be easily performed by sealing the ears on the front side of the one side part 3A and the other side part 3C of the inner pack 3 with the seal part 7 similar to the above. . As shown in FIG. 5, when the opening end portion of the inner pack 3 is completely sealed by the seal portion 7, the core material 2 housed in the inner pack 3 is held in a stable compressed state. The shaped body 5 has a dimensional shape in which the thickness t2 of the core material 2 inside the inner pack 3 is several tens of mm or less, preferably about 25 mm, and can be easily accommodated in the bag-like barrier material 4.

  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.

  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, in this embodiment, the shaped body 5 of the vacuum heat insulating material 1 is configured by the core material 2 made of glass wool and the inner pack 3 as a sheet material that can be stored and held in a compressed state. Yes.

  Further, in this embodiment, a manufacturing method of the shaped body 5 is adopted in which the core material 2 made of glass wool is covered with the inner pack 3, the inside of the inner pack 3 is decompressed, and the core material 2 is stored and held in a compressed state. ing.

  If it does in this way, instead of the conventional inorganic binder and organic binder, since the inner pack 3 accommodates the core material 2 and holds it in a compressed state, the binder is applied to the core material 2 or a baking process is performed. There is no need at all, and a stable shaped shaped body 5 having a stable shape can be obtained in a short time, and problems in productivity and the environment can be eliminated. In addition, since nothing is added to the core material 2 itself, including the binder, the extremely excellent heat insulation performance as a single glass wool can be maintained as it is.

  Further, in this embodiment, since the thickness of the inner pack 3 is 0.05 mm or less, the workability when the inner pack 3 is made into a bag shape and the opening of the inner pack 3 left for vacuum decompression are sealed. The workability at the time of doing 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 1 as a heat insulating material in a present Example is applicable with respect to all products other than a refrigerator and a cooking appliance.

It is a disassembled perspective view of the vacuum heat insulating material in the preferable Example of this invention. 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.

Explanation of symbols

1 Vacuum insulation (insulation)
2 Core material 3 Inner pack (sheet material)
5 Shaped body

Claims (3)

A heat insulation shaped body comprising a core material made of glass wool and a sheet material capable of storing and holding the core material in a compressed state. The thickness of the said sheet material was 0.05 mm or less, The shaping body of the heat insulating material of Claim 1 characterized by the above-mentioned. A method for manufacturing a shaped body of a heat insulating material, comprising: covering a core material made of glass wool with a sheet material; decompressing the inside of the sheet material; and storing and holding the core material in a compressed state.

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