JP2012197950A - Heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating material which has improved moisture adsorption performance and whose reliability can be secured for a long period.SOLUTION: A vacuum heat insulating material 1 is constituted by wrapping a core material 2 and a moisture adsorbent 3 with a barrier material 22 as an outer covering material. At least three or more moisture adsorbents 3 are arranged to be distributed to the right and left from the longitudinal center C of the core material 2. Namely, the moisture adsorbents 3 are not disposed to be concentrated at one location of the core material 2, but are distributed to the right and left from the longitudinal center C of the core material 2 to dispose at least three of them, so that moisture can be uniformly adsorbed in the entire inside of the barrier material 22. Accordingly, speed of moisture adsorption by the moisture adsorbent 3 is increased, the heat insulation performance is improved, and the reliability of the vacuum heat insulating material 1 can be secured for a long period.

Description

  The present invention relates to a heat insulating material excellent in heat insulating properties.

  Conventionally, as a method of forming a recess in this type of heat insulating material, there is a method of compressing the heat insulating material by press molding (for example, Patent Document 1) or a method of rotating the roller to compress the heat insulating material (for example, Patent Document 2). Are known.

  Patent Documents 3 and 4 disclose a heat insulating material in which an adsorbent is disposed in order to absorb moisture.

Japanese Patent No. 3793113 JP 2007-205530 A Japanese Patent No. 3465713 JP 2007-155087 A

  In the above prior art, since the concave portion is formed by compression, the outer casing is damaged.

  In addition, the adsorbent has a poor ability to adsorb moisture and has a problem that the heat insulation performance deteriorates.

  An object of the present invention is to provide a heat insulating material capable of improving moisture adsorption performance and ensuring long-term reliability.

  In the heat insulating material according to claim 1, the moisture adsorbent is not concentrated in one place of the core material, but is dispersed to the left and right from the longitudinal center of the core material, and at least three or more are arranged. It becomes possible to adsorb the moisture of the object uniformly. Therefore, the moisture adsorption performance by the moisture adsorbent is improved, the heat insulation performance is improved, and long-term reliability as a heat insulation material can be secured.

  According to the configuration of claim 1, it is possible to provide a heat insulating material that has improved moisture adsorption performance and can ensure long-term reliability.

It is a whole perspective view of the heat insulating material of the completion state which shows one Example of this invention. It is sectional drawing of the heat insulating material of a completion state same as the above. It is a perspective view of the core material which shows the manufacturing process of a heat insulating material same as the above. It is sectional drawing of the state which inserted the water | moisture-content adsorption agent into the core material same as the above. It is a perspective view of the vacuum heat insulating material before forming a recessed part same as the above. It is a schematic explanatory drawing which shows the manufacturing process at the time of forming a recessed part in a vacuum heat insulating material same as the above. It is a schematic explanatory drawing which shows another manufacturing process at the time of forming a recessed part in a vacuum heat insulating material same as the above. It is whole sectional drawing of the heat insulating material of the completion state which shows another Example of this invention. It is a perspective view of the core material which shows the manufacturing process of a heat insulating 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 shaping body which shows the state after compressing a core material same as the above.

  Hereinafter, preferred embodiments of a heat insulating material according to the present invention will be described with reference to the accompanying drawings. 1 and 2 show a heat insulating material in a completed state, that is, a vacuum heat insulating material 1. In each of these drawings, a flat plate-shaped vacuum heat insulating material 1 covers a core material 2 and a moisture adsorbent 3. It is configured by packaging in a vacuum state with the outer packaging material 4 as a body. The core material 2 is made of a heat insulating material in which fibrous glass wool is laminated, and the moisture adsorbent 3 corresponding to the adsorbent is sealed in a bag shape with a laminated sheet-like film, and inside thereof is oxidized. An inorganic substance having a moisture adsorption function, such as calcium, silica gel, or zeolite, is provided.

  The core material 2 used in this embodiment does not contain a conventional inorganic binder or organic binder, and is formed of glass wool alone. Further, the outer packaging material 4 before vacuum sealing is formed in a bag shape having only one side opened, and the core material 2 and the moisture adsorbent 3 are inserted from this opening and vacuum sealed. The outer packaging material 4 may be any material as long as it has a gas barrier property and can accommodate the core material 2 and the moisture adsorbent 3 and maintain the inside in a vacuum. For example, a metal such as aluminum is deposited on the surface. A laminated bag such as a plastic film is used.

  Reference numeral 5 denotes a recess formed on the surface of the flat vacuum heat insulating material 1 while rotating the roller 6 in the linear direction S. The concave portion 5 is formed linearly along the direction of rotation of the roller 6, and its bottom surface is formed in a flat shape without any irregularities in any part. In addition, here, two parallel concave portions 5 and 5 are formed on one side surface of the vacuum heat insulating material 1 along the longitudinal direction of the vacuum heat insulating material 1 from one end to the other end of the vacuum heat insulating material 1. The

  As shown in FIG. 1, the moisture adsorbent 3 is provided on a flat portion of the core material 2 where the recess 5 is not formed. The moisture adsorbent 3 has a rectangular shape, and is arranged so that the long side is along the concave portion 5 formed in the linear direction. As shown in FIG. 2, when the thickness of the flat portion where the concave portion 5 of the core material 2 is not formed is T, the depth T ′ of the concave portion 5 of the core material 2 is T × 1/3 or more. It is preferable that

  The roller 6 for forming the concave portion 5 is configured by integrally including a cylindrical roller body 7 and a convex portion 8 formed on the outer periphery of the roller body 7, and the short direction of the vacuum heat insulating material 1. It rotates about a shaft 9 along the axis. The convex portion 8 has the same height at any part of the outer periphery of the roller body 7 corresponding to the depth T ′ of the concave portion 5. Further, two convex portions 8 and 8 are formed on the roller body 7 corresponding to the two parallel concave portions 5 and 5.

  Next, the manufacturing method of the said vacuum heat insulating material 1 is demonstrated, referring FIGS. 3-6. FIG. 3 shows a single core material 2, which uses a mold (not shown) to obtain a core material 2 having a predetermined size. At that time, a cutting blade is put in advance at a position where a portion where the concave portion 5 is formed is escaped, and a concave insertion portion 2A into which the moisture adsorbent 3 can be inserted is formed.

  Then, after obtaining the drying process of the core material 2, as shown in FIG. 4, in the insertion part 2A of the place which put the cutting blade, the core material 2 is removed and it thins, and the water | moisture-content adsorption agent 3 is inserted in the insertion part 2A. insert. An appropriate amount of the small piece 2B of the core material 2 removed when the cutting blade is inserted is peeled off and returned to cover the moisture adsorbent 3, so that the moisture adsorbent 3 does not directly hit the outer packaging material 4. .

  FIG. 5 shows a state in which the moisture adsorbent 3 is attached to the core material 2, and these are placed in a bag-shaped outer packaging material 4 and set in a vacuum device (not shown). This is a flat vacuum heat insulating material 1 ′ obtained by stopping. Here, for convenience of explanation, the vacuum heat insulating material before forming the recess 5 is denoted by reference numeral 1 ′, and the vacuum heat insulating material in a completed state is denoted by reference numeral 1. As described above, since the upper portion of the moisture adsorbent 3 inserted into the insertion portion 2A is covered with the small pieces 2B in advance, the moisture adsorbent 3 becomes the outer packaging material 4 when these are placed inside the outer packaging material 4. It is designed not to hit directly.

  FIG. 6 shows a manufacturing process in a state where the recess 5 is formed on the surface of the vacuum heat insulating material 1 ′. Here, as a processing apparatus for forming the concave portion 5, in addition to the roller 6 described above, a guide roller 11 disposed with a predetermined gap facing the roller 6, a pair of rollers 6 and a guide roller. 11 and a pair of feed rollers 12 and 13 disposed along the conveying direction L of the vacuum heat insulating material 1 ′. The feed rollers 12 and 13 are for conveying the vacuum heat insulating material 1 ′ between the roller 6 and the guide roller 11, and both are rotatably supported by a processing apparatus main body (not shown). Similarly, the other roller 6 and the guide roller 11 are also rotatably supported by the processing apparatus main body. Note that the feed rollers 12 and 13 may be provided not only on the front side of the roller 6 but also on the rear side of the roller 6 with respect to the conveying direction L of the vacuum heat insulating material 1 ′. Similar to the guide roller 11, the feed rollers 12, 13 and the roller 6, the vacuum heat insulating material 1 ′ is rotated around an axis along the short direction.

  In the manufacturing process for forming the recess 5, first, in a state where the flat vacuum heat insulating material 1 ′ is sandwiched between the feed rollers 12 and 13, the feed rollers 12 and 13 are rotated in the direction of the arrow shown in FIG. 6. The vacuum heat insulating material 1 ′ is conveyed toward the roller 6 so that the vacuum heat insulating material 1 ′ passes between the roller 6 and the guide roller 11. Here, when the roller 6 and the guide roller 11 are rotated in the direction of the arrow shown in FIG. 6, the convex portion 8 of the roller 6 linearly presses the surface of the vacuum heat insulating material 1 ′ along the transport direction L, The pressed portion is plastically deformed, and the concave portion 5 is gradually formed from one end of the vacuum heat insulating material 1 ′. As a result, it is possible to obtain the vacuum heat insulating material 1 in which the linear recess 5 having no irregularities is formed on the bottom surface as shown in FIG.

  In the manufacturing process of the recessed part 5 shown in FIG. 6, the recessed part 5 is not formed at once with respect to flat vacuum heat insulating material 1 ', but toward the linear direction corresponding to the conveyance direction L of vacuum heat insulating material 1'. Since the concave portion 5 is gradually formed according to the transport position of the vacuum heat insulating material 1 ′ while rotating the roller 6, damage to the outer packaging material 4 can be reduced.

  As another method of manufacturing the vacuum heat insulating material 1 ′, the core material 2 fitted with the moisture adsorbent 3 is wrapped with another member, for example, a sheet material such as a polypropylene sheet, and compressed, and the sheet material is compressed in the compressed state. The sealed body is heat-sealed to form a sealed molded body, and the molded body inserted into the bag-shaped outer packaging material 4 is set in a vacuum apparatus, and after opening one end of the sheet material before decompression, the outer packaging material 4 The inside may be decompressed and vacuum sealed. An example of this will be described later.

  As described above, in this embodiment, the vacuum insulating material 1 is a heat insulating material that is formed by wrapping the core material 2 with the outer packaging material 4 as the outer cover and forms the linear concave portion 5, and this concave portion 5 forms the roller 6 rotating in the said linear direction.

  That is, since the vacuum heat insulating material 1 here forms the linear recessed part 5 gradually by rotating the roller 6 toward a linear direction, it is at once by conventional press molding or roller processing. The damage to the outer packaging material 4 is less than that forming the recess 5, and long-term reliability can be secured as the vacuum heat insulating material 1.

  The depth T ′ of the recess 5 formed in the vacuum heat insulating material 1 is preferably 1/3 or more of the thickness T of the core material 2. In this embodiment, since the concave portion 5 is formed gradually rather than at one time, even if the depth T ′ of the concave portion 5 is formed to be 1/3 or more of the thickness T of the core material 2, damage to the outer packaging material 4 is caused. The problem that the damage to the outer packaging material 4 increases as the concave portion 5 is formed deeper as in the prior art can be solved.

  Furthermore, it is preferable to arrange the moisture adsorbent 3 as the adsorbent so that the long side which is the predetermined portion side is along the linear direction of the recess 5. If it carries out like this, the water | moisture-content adsorption agent 3 can be made not to become obstructive at the time of formation of the recessed part 5 by arrange | positioning the water | moisture-content adsorbent 3 in the position which does not interfere with the recessed part 5 formed linearly.

  Next, another embodiment will be described with reference to FIG. Here, the rollers 6 and 16 are arranged in parallel along the transport direction L of the vacuum heat insulating material 1 ′, and the guide rollers 11 and 21 are provided to face the rollers 6 and 16, respectively. This is different from FIG.

  More specifically, the roller 16 is configured by integrally including a cylindrical roller body 17 and a convex portion 18 formed on the outer periphery of the roller body 17 in the same manner as the roller 6 described above. The heat insulating material 1 rotates about a shaft 19 along the short direction. However, although the roller main bodies 7 and 17 have the same shape, the convex portion 8 of the roller 6 and the convex portion 18 of the roller 16 have different heights, and the roller body 7 and 17 have a higher roller height than the convex portion 8 of the roller 6. The 16 convex portions 18 are formed higher. That is, the plurality of rollers 6 and 16 are respectively arranged so that the heights of the convex portions 8 and 18 are sequentially increased in the transport direction L of the vacuum heat insulating material 1 ′. Other configurations as the processing apparatus are the same as those shown in FIG. 6, but as a modification, for example, three or more rollers 6 and 16 may be arranged.

  In the manufacturing process for forming the recess 5, first, in a state where the flat vacuum heat insulating material 1 ′ is sandwiched between the feed rollers 12 and 13, the feed rollers 12 and 13 are rotated in the direction of the arrow shown in FIG. 7. The vacuum heat insulating material 1 is directed toward these rollers 6 and 16 so that the vacuum heat insulating material 1 'passes between the roller 6 and the guide roller 11 and between another roller 16 and the guide roller 21 in order. Carry '. Here, when the roller 6 and the guide roller 11 and the roller 16 and the guide roller 21 are all rotated in the direction of the arrow shown in FIG. 7, first, the convex portion 8 of the roller 6 on the near side in the transport direction L is vacuum-insulated. The surface of the material 1 ′ is pressed linearly along the conveying direction L, and the pressed portion is plastically deformed at a depth corresponding to the height of the convex portion 8. The portion 18 is further linearly pressed along the conveying direction L at the portion plastically deformed by the convex portion 8, and finally has a depth T ′ corresponding to the height of the convex portion 18, and the vacuum heat insulating material 1 ′. The concave portion 5 is gradually formed from one end. As a result, it is possible to obtain the vacuum heat insulating material 1 in which the linear recess 5 having no irregularities is formed on the bottom surface as shown in FIG.

  In the manufacturing process of the recessed part 5 shown in FIG. 7, it does not form the recessed part 5 at once with respect to flat vacuum heat insulating material 1 ', but toward the linear direction corresponding to the conveyance direction L of vacuum heat insulating material 1'. While the rollers 6 and 16 are rotated, the concave portion 5 is gradually formed according to the transport position of the vacuum heat insulating material 1 ′, so that damage to the outer packaging material 4 can be reduced. Particularly in this example, the recess 5 is not formed at a desired depth at a time by the single roller 6 but is formed at a desired depth step by step through the plurality of rollers 6, 16. Damage to 4 can be further reduced. In addition, this can be realized by transporting the vacuum heat insulating material 1 ′ once to the plurality of rollers 6 and 16 which are arranged in advance at a predetermined position, so that the cost can be reduced.

  As described above, the concave portions 5 here are the rollers 6 provided in multiple stages so that the convex portions 8 and 18 become higher in order as viewed from a predetermined feeding direction which is the conveying direction L of the vacuum heat insulating material 1 ′. 16 is formed while rotating in a linear direction. Therefore, when forming the recess 5, the vacuum heat insulating material 1 ′ is passed through the multistage rollers 6, 16, not at a desired depth at a time. Sequentially, a desired depth can be formed. Therefore, the damage to the outer packaging material 4 is further reduced, and the vacuum heat insulating material 1 ′ only needs to be passed once through the plurality of rollers 6, 16, so that the processing cost can be reduced.

  Next, another embodiment of the vacuum heat insulating material 1 will be described in detail with reference to FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the said Example, and description of a common location is abbreviate | omitted as much as possible to avoid duplication.

  FIG. 8 shows a completed state of the vacuum heat insulating material in the present embodiment. Here, the core material 2 made of the glass wool alone, the inner pack 21 as a sheet material for storing the core material 2, and these cores are shown. The material 2 and the inner pack 3 are constituted by a barrier material 22 serving as an outer package for packaging in a vacuum state. The barrier material 22 corresponds to the outer packaging material 4, and the barrier material 22 before vacuum sealing is formed in a bag shape having only one side opened, and the core material 2 is compressed into the inner pack 21 from this opening. The shaped body 23 stored in the state is inserted and vacuum sealed. The barrier material 22 may be any material as long as it has a gas barrier property and the core material 2 can be accommodated in the inner pack 21 and the inside can be kept in a vacuum. For example, a metal such as aluminum is deposited on the surface. A laminated bag such as a plastic film is used. Further, here, the moisture adsorbent 3 is housed in the inner pack 21 together with the core material 2.

  Next, the manufacturing process of the vacuum heat insulating material 1 shown in FIG. 8 is demonstrated, referring each figure of FIGS. 9-12. FIG. 9 shows a single core material 2, which uses a mold (not shown) to obtain a core material 2 having a predetermined size. At that time, a cutting blade is put in advance at a position where a portion where the concave portion 5 is formed is escaped, and a plurality of concave insertion portions 2A into which the moisture adsorbent 3 can be inserted are formed.

  Then, after obtaining the drying process of the core material 2, as shown in FIG. 4 described above, in the insertion portion 2A where the cutting blade is inserted, the core material 2 is removed to reduce the thickness, and moisture is adsorbed to the insertion portion 2A. Agent 3 is inserted. An appropriate amount of the small piece 2B of the core material 2 removed when the cutting blade is inserted is peeled off and put back on the moisture adsorbent 3, so that the moisture adsorbent 3 directly hits the inner pack 21 and the barrier material 22. Do not.

  FIG. 10 shows a state in which the core material 2 before compression is wrapped with the inner pack 21. For the inner pack 21 that covers the core material 2, a material that can maintain the sealing performance, heat resistance, and durability (hardness to cut) is selected in each manufacturing process until the shaping body 23 described later is inserted into the barrier material 22. . Specifically, the material of the inner pack 21 is preferably a polypropylene resin or a polyethylene resin. The thickness of the inner pack 21 is determined after the workability when the inner pack 21 is made into a bag shape after that, the bag-like inside of the inner pack 21 is vacuum reduced or pressed, or the vacuum reduced pressure and the pressed state are used in combination. In consideration of workability when the opening of the inner pack 21 is sealed, it is preferably 0.05 mm or less.

  Here, the process of covering the core material 2 with the inner pack 21 will be described. The core material 2 loaded with the moisture adsorbent 3 is placed on one side portion 21A of the sheet-like inner pack 21 cut into a predetermined size. 10, the intermediate portion 21 </ b> B is folded back so that the one side portion 21 </ b> A and the other side portion 21 </ b> C of the inner pack 21 face each other with the core material 2 interposed therebetween. Next, after compressing the core material 2 carrying the moisture adsorbent 3 with a press or the like, the one side portion 21A of the inner pack 21 and the ear portions 21D on the left and right sides of the other side portion 21C are overlapped (FIG. 11). ), The ear portions 21D formed on the one side portion 21A and the other side portion 21C of the inner pack 21 may be sealed by heat sealing. At that time, if one side of the ear portion 3D is opened for vacuum decompression, and the ear portions 21D are heat-sealed immediately after the decompression, the core material 2 that maintains the compressed state as shown in FIG. Can be obtained in the inner pack 21.

  In the manufacturing process of the vacuum heat insulating material 1, the shaped body 23 is inserted into the inside of the barrier material 22 formed in a bag shape having gas barrier properties from the open end, and then put into a vacuum device (not shown) to be evacuated. The vacuum heat insulating material 1 shown in FIG. 9 is formed by heat-sealing and sealing the opening end of the barrier material 22. It should be noted that the inner pack 21 may be a bag having one end opened in advance.

  The moisture adsorbent 3 as the desiccant has a moisture adsorption amount of about 30% of its own weight, but adsorbs moisture when the moisture adsorbent 3 comes into contact with moisture, and therefore adsorbs moisture present at a distant place. It takes time to do. Therefore, as shown in FIG. 9, the four moisture adsorbents 3 are dispersed and evenly distributed from the longitudinal center C of the core material 2 to the left and right, whereby residual moisture and the barrier material 22 of the core material 2 are disposed. Make it possible to efficiently adsorb moisture that has passed through. The number of the moisture adsorbents 3 may be any number as long as it is at least 3 or more. At that time, the longitudinal direction of the core material 2 can be used to efficiently adsorb moisture at any part of the vacuum heat insulating material 1. The moisture adsorbent 3 is arranged in a distributed manner from the center C to the left and right.

  As described above, in this embodiment, the vacuum heat insulating material 1 is configured by wrapping the core material 2 and the water adsorbent 3 with the barrier material 22 that is an outer covering, and includes at least three water adsorbents 3. Are distributed from the longitudinal center C of the core material 2 to the left and right. That is, the barrier material 22 is not disposed by concentrating the moisture adsorbent 3 in one place of the core material 2 but by dispersing at least three from the center C in the longitudinal direction of the core material 2. It becomes possible to adsorb moisture uniformly throughout the interior of the glass. Therefore, the speed of moisture adsorption by the moisture adsorbent 3 is increased, the heat insulation performance is improved, and long-term reliability as the vacuum heat insulating material 1 can be secured.

  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, in the embodiments after FIG. 9, the recess 5 may be formed in the vacuum heat insulating material 1 '.

1 Vacuum insulation (insulation)
2 Core material 3 Moisture adsorbent 22 Barrier material (cover)

Claims (1)

It is a heat insulating material configured by wrapping a core material and a moisture adsorbent in an outer casing,
A heat insulating material, wherein at least three or more of the moisture adsorbents are dispersed and arranged from the center in the longitudinal direction of the core material.

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