JP2011179635A - Vacuum heat insulating material and insulating box equipped with this vacuum heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material which is good in insulating performance, and excellent in productivity, handling property and recyclability, furthermore excellent in an inserting ability of absorbent. <P>SOLUTION: In the vacuum heat insulating material 6, in which the inside is processed in decompression condition by enclosing a core material 1 in a container 2 with gas barrier property, the core material 1 is constructed in laminated structure by winding seat-like fiber aggregate in series from inner circumference to outer periphery, and one side end (A) in winding direction of the laminated structure is cut; a cutting section 4 formed in the one side end (A) of the core material 1 is formed in concave, for example rough V-character in cross section, toward an inner side of the core material 1 before being decompressed; and decompressing sealing is processed by placing an absorbent 3 in the cutting section 4 of the core material 1, and arranging it at an insertion port 5 side of the container 2 with the gas barrier property. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating material and a heat insulating box provided with the vacuum heat insulating material, and more particularly to a vacuum heat insulating material suitable for use in a refrigeration apparatus and a heat insulating box provided with the vacuum heat insulating material.

  Conventionally, urethane foam has been used as a heat insulating material used in a heat insulating box such as a refrigerator. In recent years, due to market demands for energy saving and space saving and large capacity, a form in which a vacuum heat insulating material having better heat insulating performance than urethane foam is embedded in urethane foam is used. Such a vacuum heat insulating material is also used for a refrigerator or the like.

In the vacuum heat insulating material, powder, foam, fiber or the like is inserted as a core material into an outer packaging material made of a plastic laminate film using an aluminum foil as a gas barrier layer. The inside of this vacuum heat insulating material is kept at a degree of vacuum of several Pa (Pascal) or less.
As the core material of the vacuum heat insulating material, powders such as silica, foams such as urethane, and fiber bodies are used.

  The fibrous body includes inorganic fibers and organic fibers. Inorganic fibers include inorganic fibers such as glass fibers and ceramic fibers (see, for example, Patent Documents 1 and 8), while organic fibers include polypropylene fibers, polylactic acid fibers, aramid fibers, and LCP (liquid crystal polymer) fibers. And organic fibers such as polyethylene terephthalate fiber, polyester fiber, polyethylene fiber, and cellulose fiber (see, for example, Patent Documents 2, 7, and 9). At present, glass fibers having excellent heat insulation performance are the mainstream of vacuum insulation core materials.

  Examples of the shape of the fibrous body include cotton-like ones, sheets laminated (for example, see Patent Document 3), and sheets laminated so that fiber orientations alternate (for example, Patent Documents 4, 5, and 6). (See, for example, Patent Document 10).

  Further, an adsorbent that adsorbs gas and moisture is disposed in the outer packaging material in order to suppress the deterioration of the degree of vacuum, which is a factor of lowering the heat insulating performance of the vacuum heat insulating material. In this case, the core material is cut at an arbitrary depth and molded by applying pressure, and the adsorbent is disposed in the recess to suppress the unevenness of the surface of the vacuum heat insulating material (for example, patents) Reference 11).

JP-A-8-028776 (pages 2 to 3) JP 2002-188791 A (page 4) JP 2005-344832 A (page 3) JP 2006-307921 A (page 5) JP 2006-017151 A (page 3) Japanese Examined Patent Publication No. 7-103955 (2nd page) JP 2006-283817 A (page 4) JP-A-2005-344870 (page 7) JP 2006-161939 A (page 4) Japanese Patent Laid-Open No. 62-204093 (2nd page, FIG. 4) JP 2004-218747 A (page 4)

  In the vacuum heat insulating materials of Patent Documents 1 and 8, glass fibers are mainly used as the core material. When glass fiber is used as a core material, it has excellent heat insulation performance, but the core material must be inserted into an outer packaging material such as an aluminum foil laminate film and the inside is vacuum sealed to produce a vacuum heat insulating material. May pierce the outer packaging material and damage or break the outer packaging material. For this reason, the glass fiber core material is not inserted directly into the outer packaging material, but inserted into the outer packaging material in a state of being inserted into a separate bag such as a plastic bag, but an extra plastic bag is required, The manufacturing process of the core material and the vacuum heat insulating material becomes complicated and the cost increases.

Further, since glass fiber is hard and brittle, dust may scatter during manufacture of a vacuum heat insulating material and may be irritated if it adheres to the skin, mucous membrane, etc. of an operator, and there is a problem in handling and workability.
Furthermore, from the viewpoint of recycling, for example, in a refrigerator, each product is pulverized in a recycling factory. At this time, the glass fiber is mixed with urethane waste and subjected to thermal recycling. However, the glass fiber is not recyclable because it reduces combustion efficiency and becomes a residue.

On the other hand, the vacuum heat insulating material using the polyester fibers of Patent Documents 2, 7, and 9 as the core material is excellent in handleability and recyclability, but has a thermal conductivity of 0.0030 [W / mK, which is an index representing the heat insulating performance. ] (Refer to Patent Document 7) and is inferior in heat insulation performance compared to a general vacuum heat insulating material (thermal conductivity of about 0.0020 [W / mK]) using glass fiber as a core material.
For this reason, as in Patent Documents 3, 4, and 5, there is a vacuum heat insulating material that thins the organic fiber layer and makes the fiber orientation perpendicular to the heat transfer direction to improve the heat insulation performance. As a result, productivity becomes worse.

  Although it is conceivable to improve productivity by forming a core material by laminating continuous strip-like sheet-like members alternately in different directions as in Patent Document 10 so as to overlap and fold them in a different direction, Is required, and the structure of the folding device is complicated and expensive, resulting in an increase in cost.

  In addition, in order to suppress the deterioration of the degree of vacuum, which is a cause of lowering the heat insulation performance, the vacuum heat insulating material is arranged in the outer packaging material. When cutting is made and pressure is applied, the adsorbent is placed in the recess, and the unevenness on the surface of the vacuum heat insulating material is suppressed, the direction of the cut is not constant. Sexuality gets worse.

  The present invention has been made in order to solve the above-described problems, and has a good heat insulation performance, excellent productivity, handleability, recyclability, and excellent vacuum insertability. And it aims at providing the heat insulation box provided with this vacuum heat insulating material.

The vacuum heat insulating material according to the present invention is
A vacuum heat insulating material in which a core material is sealed in a gas barrier container and the inside is in a reduced pressure state,
The core material is obtained by continuously winding a sheet-like fiber assembly from the inner periphery toward the outer periphery to form a laminated structure, and cutting one end portion in the winding direction of the laminated structure.
Moreover, the heat insulation box which concerns on this invention is equipped with an outer box and the inner box arrange | positioned inside the outer box, and arrange | positions said vacuum heat insulating material between an outer box and an inner box.

ADVANTAGE OF THE INVENTION According to this invention, the vacuum heat insulating material excellent in handling property, heat insulation performance, and productivity can be obtained, aiming at effective utilization of resources.
Moreover, the heat insulation box excellent in heat insulation can be obtained.

It is a perspective view of the vacuum heat insulating material which concerns on Embodiment 1 of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is explanatory drawing which shows the lamination | stacking state of the core material of the vacuum heat insulating material of FIG. It is a perspective view of the state which cut | disconnected the one side edge part of the core material of the vacuum heat insulating material of FIG. It is a perspective view of the state which inserted the core material of the vacuum heat insulating material of FIG. 4 in the outer packaging material. It is a perspective view which shows the vacuum heat insulating material after evacuating the core material of FIG. It is explanatory drawing which shows the manufacturing method of the vacuum heat insulating material of FIG. It is explanatory drawing which shows the manufacturing method of the vacuum heat insulating material which concerns on Embodiment 2 of this invention. It is the perspective view which showed a part of core material of the vacuum heat insulating material which concerns on Embodiment 3 of this invention in the cross section. It is explanatory drawing which shows the manufacturing method of the vacuum heat insulating material of FIG. It is explanatory drawing which shows the manufacturing method of the vacuum heat insulating material which concerns on Embodiment 4 of this invention. It is explanatory drawing which shows the manufacturing method of the vacuum heat insulating material following FIG. It is sectional drawing of the heat insulation box which concerns on Embodiment 5 of this invention.

[Embodiment 1: Vacuum heat insulating material]
1 and 2, the vacuum heat insulating material 6 includes a gas barrier container 2 (hereinafter referred to as an outer packaging material) having an air barrier property, and a core material 1 and a gas adsorbent 3 enclosed in the outer packaging material 2. The inside of the outer packaging material 2 is depressurized to a predetermined degree of vacuum. The outer packaging material 2 of the vacuum heat insulating material 6 is made of a plastic laminated film having a gas barrier property made of nylon, aluminum vapor-deposited PET, aluminum foil, and high-density polyethylene. Moreover, the core material 1 enclosed in the outer packaging material 2 is a laminate of a plurality of sheet-like (band-like) fiber assemblies (nonwoven fabrics), as shown in FIG. An organic fiber aggregate, for example, a polyester organic fiber nonwoven fabric subjected to hot embossing. Further, the adsorbent 3 is calcium oxide that can absorb the moisture of the polyester organic fiber aggregate constituting the core material 1. The adsorbent 3 may be used in combination with a gas adsorbent such as synthetic zeolite.

Below, the structure of the core material 1 of the vacuum heat insulating material 6 is described.
As shown in FIG. 4, the core material 1 is formed by continuously winding a plurality of (two in the present embodiment) sheet-like organic fiber aggregates having a width X from the inner periphery toward the outer periphery. In this case, only the A side of one end A, B in the winding direction is cut (cut). This cutting part 4 is formed in a concave shape toward the central part 1a on the inner side of the core material 1 before the decompression state. For example, it has the 1st, 2nd inclined surface 4a, 4b which is formed in the cross-section substantially V shape toward the center part 1a of the inner side of the core 1, and expands toward the outer side. The adsorbent 3 is placed on the first inclined surface 4 a on the lower side of the cutting portion 4 of the core material 1.

  The cutting portion 4 of the core material 1 is inserted toward the insertion port 5 side of the outer packaging material 2, the core material 1 is in a reduced pressure state (vacuum state), and the cutting portion 4 having a substantially V-shaped cross section is closed. Thus, the first and second inclined surfaces 4a and 4b are combined, and the surface becomes smooth as shown in FIG.

The manufacturing method of the vacuum heat insulating material 6 comprised as mentioned above is demonstrated.
As shown in FIG. 7, two sets of rolls 20 and 21 formed by winding the organic fiber aggregates 10 and 11 having a width X in a coil shape are prepared, and the rolls 20 and 21 are arranged in the front-rear direction (the axial direction of the roll In the direction perpendicular to the sheet), and simultaneously wound up by the reel 22, and the reel 22 is removed. Next, as shown in FIG. 4, only the A side of the one-side end portions A and B in the winding direction is cut into a substantially V-shaped cross section extending outward. The adsorbent 3 is placed on the first inclined surface 4a on the lower side of the cutting portion 4 so that the core material 1 faces the insertion port 5 side of the outer packaging material 2 as shown in FIG. Insert and hold the outer packaging material 2 at, for example, 2.0 Pa or less for a certain time using a vacuum packaging machine, and then seal the insertion port 5 side of the outer packaging material 2 as shown in FIG. 6 is formed. At this time, the first and second inclined surfaces 4a and 4b of the core material 1 are closed.

  The heat insulating performance of the vacuum heat insulating material 6 thus formed was evaluated by thermal conductivity. The thermal conductivity was measured with a thermal conductivity measuring machine manufactured by Eiko Seiki Co., Ltd. As a result, the thermal conductivity of a vacuum heat insulating material obtained by laminating organic fiber aggregates matched to the dimensions of a conventional desired core material was 0. A value equivalent to 0.0023 W / m · K was obtained for 0023 W / m · K.

  As described above, since a plurality of fiber assemblies are laminated in a roll shape and only one end portion A in the winding direction is cut, the vacuum drawability can be improved. Further, the productivity is superior to stacking sheets cut one by one. Further, since the end portion is cut, it becomes easy to put the adsorbent 3 from the cut portion 4 and the productivity is improved. Moreover, since the one-side end portion A becomes thin, forming the vacuum heat insulating material 1 by sandwiching the adsorbent 3 in the thinned portion makes the surface smoother and also prevents deterioration of the heat insulating performance due to slow leak due to pinholes. it can.

[Embodiment 2: Vacuum insulation]
In Embodiment 1, the core material 1 has a laminated structure in which a plurality (two) of sheet-like fiber assemblies are continuously wound from the inner periphery toward the outer periphery, and only one end portion in the winding direction is formed. In this embodiment, one sheet-like fiber assembly is continuously wound from the inner periphery toward the outer periphery to form a laminated structure, and only one end in the winding direction is cut. It is what you do.
As shown in FIG. 8, one set of rolls 20 obtained by winding the organic fiber assembly 10 having a width X in a coil shape is prepared, wound by a winding frame 22, and only one end portion in the winding direction is expanded outward. Cut into a substantially V-shaped cross section.
Other configurations, operations, and effects are substantially the same as those shown in the first embodiment, and a description thereof will be omitted.

[Embodiment 3: Vacuum heat insulating material]
In the third embodiment, the core material 1 is obtained by continuously winding a plurality of sheets as shown in the first embodiment and cutting one end in the winding direction. A plurality of sheet-like fiber aggregates are arranged in parallel in the width direction to form a sheet-like plural fiber aggregate having a joint portion.

  As shown in FIG. 9 (partially simplified), the core material 1 includes sheet-like long fiber organic fiber assemblies (or organic fiber nonwoven fabrics) 10a to 10d and 11a to 11d having a dimension Y in the width direction. A plurality of, for example, four, are arranged in parallel to form sheet-like first and second plural fiber assemblies 100, 110 each having a width X, and these are continuously wound from the inner periphery toward the outer periphery. It is laminated in a roll shape. At this time, in the width direction I, the joint portions 12 and 13 of the organic fiber assemblies 10a to 10d and 11a to 11d constituting the first and second multiple fiber assemblies 100 and 110 do not overlap each other. Are shifted alternately to prevent slippage by utilizing the friction of the organic fiber aggregates 10 and 11 between the joints 12 and 13 so as to obtain a smooth surface. And the one side edge part A of the 1st, 2nd multiple fiber aggregates 100 and 110 is cut | disconnected in the substantially V shape extended toward the outer side from the center part 1a of the core material 1. FIG. The adsorbent 3 is placed on the first inclined surface 4 a on the lower side of the cutting portion 4 of the core material 1.

The manufacturing method of the vacuum heat insulating material 6 comprised as mentioned above is demonstrated.
As shown in FIG. 10, a plurality of individual fiber assemblies each having a width X in which four individual rolls formed by winding organic fiber assemblies having a width Y in a coil shape are arranged in the width direction A (hereinafter referred to as aggregate rolls 200 and 210). 2 sets are prepared, and collective rolls 200 and 210 each made up of individual rolls 20a to 20d and 21a to 21d are arranged in the front-rear direction B, and are simultaneously wound around the reel 22. In this case, the positions of the joint portions 12 and 13 of the first and second multi-fiber assemblies 100 and 110 are shifted by shifting the first and second assembly rolls 200 and 210 in the width direction A. .
In this way, two sets of the first and second multi-fiber assemblies 100 and 110 are simultaneously wound on the winding frame 22, and one end A in the winding direction is cut to form the core material 1 as shown in FIG. .
Other configurations, operations, and effects are substantially the same as those shown in the first embodiment, and a description thereof will be omitted.

  In this way, since the layers where the seam portions 12 and 13 are different from each other are alternately stacked except for the first winding portion, the strength can be ensured and a smooth surface can be obtained. And since the one end part A of the winding direction was cut | disconnected in the cross-sectional substantially V shape expanded toward an outer side, evacuation property can be improved. Also, it is more productive than stacking cut sheets one by one.

  In addition, unlike the core material 1 of the present invention, when inorganic fibers such as glass wool are used as the fiber aggregate, those without binder processing are difficult to wind with a roll, and binder processing is performed. Even if it exists, since the fiber itself is hard and brittle, it is difficult to manufacture due to breakage or the like, and powder is generated to cause deterioration of the working environment and heat insulation performance.

[Embodiment 4: Vacuum insulation]
In Embodiment 3, the core material is formed by continuously winding and laminating two sheet-like multiple fiber assemblies having a joint portion from the inner periphery toward the outer periphery, and one end in the winding direction is formed. In the fourth embodiment, the core material is obtained by continuously winding one sheet obliquely to form a plurality of fiber assemblies and cutting one end portion in the winding direction. .

  As shown in FIG. 11 and FIG. 12, the core material 1 is formed by winding a sheet-like organic fiber assembly 10 having a dimension Y in the width direction A with a certain angle and winding a plurality of fiber assemblies 100 having a width X. Form. At this time, the seam portions 12 before and after the organic fiber assembly 100 are disposed in parallel while being inclined in the width direction A, and the seam portions 12 of the organic fiber assemblies 10 adjacent in the vertical direction are inclined in the opposite direction. They are arranged in parallel. A cut portion having a substantially V-shaped cross section is formed at one end A in the winding direction, and the adsorbent is placed thereon.

The manufacturing method of the vacuum heat insulating material comprised as mentioned above is demonstrated.
As shown in FIG. 11, one individual roll (single roll) 20 around which the sheet-like organic fiber assembly 10 is wound is prepared, and this is wound around a slide type reel 22. At this time, as shown in FIG. 12, the individual rolls 20 are wound while being tilted at a certain angle with respect to the axial direction of the winding frame 22, and are folded back when wound to a predetermined width. Wrap around. Then, the winding frame 22 is removed, and only the end A on one side is cut to form the core material 1.
Other configurations, operations, and effects are substantially the same as those shown in the first embodiment, and a description thereof will be omitted.

[Embodiment 5: Insulation box]
In FIG. 13, the refrigerator 30 which is a heat insulating box includes an outer box 31, an inner box 32 disposed inside the outer box 31, a vacuum heat insulating material 6 disposed between the outer box 31 and the inner box 32, and A polyurethane foam (heat insulating material) 33 and a refrigeration unit (not shown) for supplying cold heat into the inner box 32 are provided. The outer box 31 and the inner box 32 each have an opening (not shown) on a common surface, and an opening / closing door (not shown) is provided in the opening.

  In the refrigerator described above, since the outer packaging material 2 of the vacuum heat insulating material 6 includes an aluminum foil (see FIG. 1), there is a possibility that a heat bridge is formed in which heat flows through the aluminum foil. For this reason, in order to suppress the influence of a heat bridge, the vacuum heat insulating material 6 is arrange | positioned away from the coated steel plate of the outer case 31 using the spacer 34 which is a resin molded product. In addition, the spacer 34 is appropriately provided with holes for not inhibiting the flow so that voids do not remain in the polyurethane foam injected into the heat insulating wall in a later step. That is, the refrigerator 30 has a heat insulating wall 35 formed by the vacuum heat insulating material 6, the spacer 34, and the polyurethane foam 33. In addition, the range in which the heat insulation wall 35 is disposed is not limited, and may be the entire range of the gap formed between the outer box 31 and the inner box 32 or a part thereof. The door may be disposed inside the opening / closing door.

  When the refrigerator 30 configured as described above is used, it is dismantled and recycled at recycling centers in various places based on the Home Appliance Recycling Law. At this time, when the core material of the vacuum heat insulating material of the refrigerator is an inorganic powder as in the conventional case, when the crushing process is performed, the powder is scattered, and the crushing process cannot be performed as it is in the box. It takes a lot of work to remove the vacuum insulation from the body. In addition, when the core material of the vacuum heat insulating material of the refrigerator is glass fiber as in the past, it can be crushed as it is in the box, and the crushed glass fiber is mixed with the pulverized polyurethane foam for thermal recycling. At this time, however, there is a difficulty in recyclability such as lowering the combustion efficiency or becoming a residue after combustion.

  On the other hand, since the refrigerator 30 according to the present invention includes the vacuum heat insulating material 6 in which the core material 1 formed of a fiber assembly (organic fiber assembly) is disposed, the vacuum heat insulating material 6 is not removed. The crushing process can be performed, and the recyclability is good without causing a reduction in combustion efficiency or a residue during thermal recycling.

  In the above description, the case where the heat insulation box is the refrigerator 30 is shown, but the present invention is not limited to this, and cold heat such as vending machines, cold storage, vehicle air conditioners, water heaters, refrigeration / air conditioners, etc. Insulating bags (insulating containers) having deformable outer bags and inner bags may be used instead of devices or thermal devices, and boxes having a predetermined shape. In these cases, the heat insulating box may be provided with temperature adjusting means to adjust the temperature inside the inner box.

  DESCRIPTION OF SYMBOLS 1 Core material, 1a Center part inside the core material, 2 Outer packaging material (gas barrier container), 3 Adsorbent, 4 Cutting part, 5 Insertion port, 6 Vacuum heat insulating material 10, 11 Fiber aggregate, 12, 13 Seam portion, 31 outer box, 32 inner box, 33 polyurethane foam (heat insulating material), 34 spacer, 100, 110 multiple fiber aggregate, A one end in the winding direction.

Claims (15)

A vacuum heat insulating material in which a core material is sealed in a gas barrier container and the inside is in a reduced pressure state,
The core material has a laminated structure in which a sheet-like fiber assembly is continuously wound from the inner periphery toward the outer periphery, and a one-side end portion in the winding direction of the laminated structure is cut. Wood.   The vacuum heat insulating material according to claim 1, wherein a cut portion formed at one end portion in the winding direction of the core material is formed in a concave shape toward the inner side of the core material before the decompression state.   The vacuum heat insulating material according to claim 2, wherein the cut portion is formed in a concave shape toward a central portion on the inner side of the core material before the decompression state.   4. The vacuum heat insulating material according to claim 3, wherein the cut portion is formed in a substantially V-shaped cross section toward a central portion on the inner side of the core member.   The vacuum heat insulating material according to any one of claims 1 to 4, wherein a cut portion of the core material is disposed on the insertion port side of the gas barrier container and sealed under reduced pressure.   The adsorbent is placed on the cutting portion of the core material, and the cutting portion is disposed on the insertion port side of the gas barrier container and sealed under reduced pressure. Vacuum insulation.   The core material is a laminate structure in which a plurality of sheet-like fiber assemblies are continuously wound from the inner periphery toward the outer periphery. The vacuum insulation material described.   7. The core material according to claim 1, wherein a single sheet-like fiber assembly is continuously wound from the inner periphery toward the outer periphery to form a laminated structure. The vacuum insulation material described.   The vacuum insulation according to claim 7 or 8, wherein the core material is formed of a plurality of sheet-like fiber assemblies having a joint portion in which a plurality of sheet-like fiber assemblies are arranged in parallel. Wood.   The vacuum heat insulating material according to claim 9, wherein the plurality of sheet-like fiber aggregates are made of sheet-like fiber aggregates having the same width.   The vacuum heat insulating material according to claim 1, wherein the sheet-like fiber aggregate is a sheet-like long-fiber organic fiber aggregate or an organic fiber nonwoven fabric.   It comprises an outer box and an inner box arranged inside the outer box, and the vacuum heat insulating material 6 according to any one of claims 1 to 11 is arranged between the outer box and the inner box. Insulated box.   The heat insulation box according to claim 12, wherein a heat insulation material is filled between the outer box and the vacuum heat insulation material and / or between the inner box and the vacuum heat insulation material. .   The heat insulation box according to claim 12 or 13, wherein a spacer is disposed between the outer box and the vacuum heat insulating material.   The heat insulation box according to any one of claims 12 to 14, wherein an internal temperature of the inner box is adjusted by a temperature adjusting means.

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