JP2006070951A - Vacuum thermal insulation panel, cooling and storage shed, and laminate film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a thermal insulation performance from lowering in a vacuum thermal insulation panel for vacuum-sealing a core material and also prevent the cooling efficiency of a cooling and storage shed formed by disposing the vacuum thermal insulation panel in a thermal insulation box from lowering. <P>SOLUTION: This vacuum thermal insulation panel 4 is formed by storing the core material 1 with thermal insulation in a bag 3 with high gas shielding property and vacuum-sealing the bag. The bag 3 comprises one outer storage material 31 and the other inner storage material 32 having a covering part 33 covering the core material 1 and an outer edge part extending outward from the peripheral edge of the covering part 33 and overlapped with each other at the outer edge part. A plurality of lattice-like cutting lines 40 are formed over the covering part 33 and the outer edge part in a metal layer 36 as a gas-barrier layer forming the outer storage material 31 and the inner storage material 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum heat insulation panel formed by housing a core material having heat insulation properties in a housing member having high gas barrier properties and vacuum-sealing, a cooling storage box in which the vacuum heat insulation panel is disposed in a heat insulation box, and a vacuum heat insulation panel The present invention relates to a laminate film that forms a storage member that stores the core material and includes a gas barrier layer made of a metal foil.

A member having a synthetic resin layer for heat insulation inside the metal foil and a film having a protective layer on the outside forms a member for housing the core material, which is a heat insulation spacer, from the container and the container lid, and the core material is housed in the container. The container is covered with a lid, evacuated, and the inside of the container is vacuum-sealed, and the synthetic resin layer at the outer edge of the container and the container lid is heat-sealed. There has been proposed a vacuum heat insulating material provided with a plurality of non-heat transfer portions from which the foil and the protective layer are continuously removed in the circumferential direction so as to block heat conduction between the outer edge portion and the flat portion of the container (patent) Reference 1).
JP-A-4-337194

  However, when the core material is stored in the container and covered with the container lid, and the inside of the container is vacuum-sealed, if the core material is shifted to one side in the container and the original is the side facing the offset side, The non-heat-transfer portion that must be located on the forehead around the core material may be located outside the forehead and on the peripheral edge that is the contact with the lid. Thus, when the non-heat transfer part of the container is located outside the forehead part and at the peripheral part which is the overlapping part with the container lid, it is located inside the non-heat transfer part and is superposed on the container lid. There is a problem that heat is transmitted from the part to the inner plane part, and the heat insulation performance of the vacuum heat insulating material is deteriorated. When such a vacuum heat insulating material is used for the heat insulation box of the cooling storage, There was a problem that the heat insulation performance was lowered and the cooling efficiency was lowered.

  Moreover, in the method of providing a non-heat-transfer part in such a core material peripheral part, it must be designed whenever the size of a vacuum heat insulation panel differs, and it is not industrially easy.

  Accordingly, in view of the above-described problems, the present invention prevents a decrease in heat insulation performance by blocking heat conduction in the metal layer of the housing member in the vacuum heat insulation panel that is evacuated and vacuum-sealed, and cooling the cooling storage. An object of the present invention is to prevent a decrease in efficiency and to easily produce a vacuum insulation panel industrially and to provide a laminate film suitable for the vacuum insulation panel.

  For this reason, the first invention is a vacuum heat insulation panel formed by vacuum-sealing a heat-insulating core material in a gas-tight housing member, and the housing member includes a covering portion that covers the core material. An outer edge portion extending outward from the periphery of the covering portion, and a plurality of grid-like cutting lines are formed in the metal layer, which is a gas barrier layer constituting the housing member, over the covering portion and the outer edge portion. It is characterized by that.

  According to a second aspect of the present invention, there is provided a heat insulating box body in which a vacuum heat insulating panel formed by housing a core material having heat insulating properties in a storage member having a high gas barrier property and vacuum-sealing is disposed between the outer box and the inner box. The storage member of the vacuum heat insulation panel includes a covering portion that covers the core material and an outer edge portion that extends outward from the periphery of the covering portion, and a gas barrier layer that constitutes the storing member In the metal layer, a plurality of grid-like cutting lines are formed between the covering portion and the outer edge portion.

  Furthermore, a third aspect of the present invention is a laminate film including a gas barrier layer made of a metal foil, which is provided with a separating portion for forming the metal foil into a thin cut shape. It is characterized by.

  According to a fourth invention, in the third invention, the spacing portion is formed by providing linear spacing portions in a lattice shape.

  The fifth invention is characterized in that the third or fourth invention comprises a second gas barrier layer comprising a metal vapor deposition layer provided on the entire surface.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the heat insulation performance in the vacuum heat insulation panel which evacuates and vacuum-seal | tightens a core material can be prevented. Moreover, the fall of the cooling efficiency of the cooling storeroom which has arrange | positioned the vacuum heat insulation panel in the heat insulation box can be prevented. Furthermore, a vacuum insulation panel can be easily produced industrially, and a laminate film suitable for the vacuum insulation panel can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings. First, the core material 1 of the vacuum heat insulating panel used as a heat insulating material for a cooling storage such as a household refrigerator, a freezer, a commercial showcase, etc., does not generate outgas. The core material 1 is dried at a temperature of 100 to 120 ° C., for example, for about 60 minutes, so that the moisture is absorbed so that no outgas is generated, and then vacuum packing is performed. That is, after drying, the core material 1 is put into the bag (container) 3 that is a storage member having a rectangular shape in plan view and heat-sealed on three sides, and the core material 1 is put into a vacuum chamber (not shown). ) And evacuated, and the degree of vacuum is, for example, 13.3 Pa to 1.33 Pa (0.1 to 0.01 Torr), and the remaining one opened is heat sealed and sealed. The vacuum heat insulation panel 4 is formed.

  Hereinafter, the bag 3 will be described in detail. The bag 3 has a gas barrier property (high gas barrier property), can be heat-sealed, and can store the core material 1 and maintain the inside in a vacuum. Anything can be used.

  As shown in FIGS. 1 and 2, the bag 3 includes an outer storage material (laminate film) 31 that is one sheet-shaped storage material and an inner storage material (laminate film) 32 that is the other storage material. A covering portion 33 for covering the core material 1 and superposed seal portions 3A, 3C, 3D and a seal portion 3B which are preliminarily polymerized outer edge portions extending outwardly from the outer peripheral edge of the covering portion 33 are provided. The outer storage material 31 and the inner storage material 32 are both the same, and are composed of a film having a good gas barrier property and a high gas barrier property. For example, a nylon layer 34 and PET (polyethylene terephthalate) are formed from the outside. Protective layer made of layer 35, for example, a four-layer structure of a gas barrier layer made of metal layer 36 such as aluminum foil (good thermal conductivity) and a heat-sealed seal layer made of high-density polyethylene layer 37, for example. Bonded and fixed with an agent.

  The metal layer 36 as the gas barrier layer has a plurality of grid-like longitudinal and horizontal cutting lines (cut lines) having a slight width by chemical etching in order to block heat conduction from the outer housing material 31 to the inner housing material 32. ) 40 are formed at intervals (see in particular FIG. 2). The cutting line 40 is a separation portion that forms an aluminum foil (metal foil) that is the metal layer 36 into a thin cut shape, that is, a linear separation portion.

  A description will be given of a method of creating the cutting line 40 formed over the entire length and width of the outer storage material 31 and the inner storage material 32. First, the nylon layer 34, the PET layer 35, and the aluminum foil are bonded and fixed. A resist solution is applied to the outer surface of the aluminum foil of the laminate film (the surface opposite to the surface on the PET layer 35 side) and dried. Next, the resist is exposed using a photomask prepared in advance. Then, the outer surface of the laminate film is immersed in an etching solution to dissolve a part of the aluminum foil corresponding to the pattern of the photomask (thereby forming a cutting line 40), and then remains on the surface of the aluminum foil. The resist is removed.

  Then, a heat-sealing seal layer composed of a high-density polyethylene layer 37 is adhered and fixed to the metal layer 36 formed with the nylon layer 34, the PET layer 35, and the cutting line 40 in this manner with an adhesive. The outer storage material 31 that is the storage material of the second storage material or the inner storage material 32 that is the other storage material is created. Therefore, the outer storage material 31 and the inner storage material 32 are thermally welded at the three side corners to form the superposition seal portions 3A, 3C, 3D and the seal portion 3B to be opened to form the bag 3 (in this case) The bag 3 is formed with the cutting lines 40 of the outer storage material 31 and the inner storage material 32 aligned with each other), and as described above, the core material 1 is put into the bag 3 from the opening of the seal portion 3B, and the vacuum is drawn. Then, the sealing portion 3B is heat sealed and sealed to form the vacuum heat insulating panel 4.

  Next, the vacuum heat insulation panel 4 produced in this way is used for the refrigerator 10 as shown in FIG. First, the refrigerator 10 includes a refrigerator main body 14 including an outer box 11 made of a steel plate, an inner box 12 formed of a synthetic resin material, and a heat insulating material 13 filled between both boxes 11 and 12, and the inner box. And a heat insulating door 16 that closes the front opening of the door 12 so as to be freely opened and closed.

  And the outer side storage material 31 of the vacuum heat insulation panel 4 is attached to the inner surface of the outer box 11, and the foamed polyurethane 15 is filled between the boxes 11 and 12 to form the heat insulating material 13. By using the vacuum heat insulating panel 4 having low conductivity (high heat insulating performance), heat leakage can be suppressed low, and the thickness of the heat insulating material 13 in the refrigerator 10 can be reduced.

  In this case, in the created vacuum heat insulation panel 4, the superposed seal portions 3A, 3C, 3D located on the three sides excluding the opening in the bag 3 before storing the core material 1 are 12 millimeters, and the bag 3 is originally large. Since the core material 1 is inserted into the bag 3 and evacuated, the surplus portion is polymerized and the ear portion becomes longer than 12 millimeters. In addition, when the vacuum is evacuated, the core material 1 is made to be shifted to either side of the opening and any other side other than the side facing the opening, that is, which of the superposition seal portions 3C or 3D That ear part becomes long.

  When the core material 1 is offset when the core material 1 is inserted into the heat insulating bag 3 and evacuated as described above, the width of the ear portion on the side facing the offset side is increased. For example, as illustrated in FIG. 2, when the core material 1 is shifted to the edge portion side of the overlap seal portion 3 </ b> D, the overlap seal portion 3 </ b> C that is a side opposite to the edge portion side of the overlap seal portion 3 </ b> D. In the ear portion, the width dimension increases, but a plurality of cutting lines 40 are formed in a lattice pattern at intervals in the gas barrier layer 37 of the outer storage material 31 and the inner storage material 32 of the heat insulation bag 3. Therefore, at least one cutting line 40C is located not only at the ear portion of the overlapping seal portion 3C but also at the peripheral portion of the covering portion 33. For this reason, the heat conduction from the one covering portion 33 to the other covering portion 33 via the ear portion of the superposition seal portion 3C or 3D of the vacuum heat insulating panel 4 can be blocked by the cutting line 40C or 40D. A decrease in the heat insulating performance of the vacuum heat insulating panel 4 can be prevented.

  In addition, when the core material 1 is shifted to the side of the overlap seal portion 3A that is the ear portion, the width of the width of the ear portion of the seal portion 3B on the opening side that is the side opposite to the side of the overlap seal portion 3A is Although the size increases, a plurality of cutting lines 40 are formed in a lattice pattern at intervals in the metal layer 36 that is the gas barrier layer of the outer storage material 31 and the inner storage material 32 of the bag 3. At least one cutting line 40B is located not only at the ear portion of the overlap seal portion 3B but also at the covering portion 33 adjacent to the ear portion of the overlap seal portion 3B. For this reason, the heat conduction from the one covering portion 33 to the other covering portion 33 through the ear portion of the polymerization sealing portion 3A or the sealing portion 3D of the vacuum heat insulating panel 4 can be blocked by the cutting line 40B or 40A. As a result, it is possible to prevent the heat insulation performance of the vacuum heat insulation panel 4 from being lowered.

  As a result, when the core material 1 is inserted into the bag 3 and evacuated, the core material 1 is a gas barrier layer of the outer storage material 31 and the inner storage material 32 of the bag 3 even when the core material 1 is offset in any direction. The cutting lines 40A, 40B, 40C, and 40D among the plurality of cutting lines 40 that are formed in a grid pattern with a space in the metal layer 36 can be positioned at the peripheral edge over the entire circumference of the covering portion 33.

  For this reason, when the vacuum heat insulation panel 4 is used for the refrigerator 10, the outside air heat through the outer box 11 is transferred from the covering portion 33 of the outer storage material 31 through the metal layer 36 to the overlapping seal portions 3A3C and 3D and the seal portion. Conduction to 3B can be blocked by cutting lines 40A, 40B, 40C, and 40D, and from the superposed seal portions 3A, 3C, and 3D of the inner storage material 32 and the seal portion 3B to the metal layer 36 of the covering portion 33 Can be cut off by the cutting lines 40A, 40B, 40C and 40D.

  That is, the outside air heat through the outer box 11 is covered from the covering portion 33 of the outer storage material 31 through the superposed seal portions 3A, 3C, 3D and the seal portion 3B of the outer storage material 31 and the inner storage material 32. Conduction to the portion 33 can be blocked by the cutting lines 40A, 40B, 40C, and 40D, and the heat insulation performance of the vacuum heat insulation panel 4 is reduced while maintaining the gas barrier effect by the metal layer 36 as the gas barrier layer as much as possible. It can be surely prevented.

  Further, in the present embodiment, a plurality of grid-like vertical and horizontal cutting lines are formed on the metal layer 36 which is a gas barrier layer of both the sheet-like outer storage material 31 and the inner heat insulating material 32 of the bag 3 as the storage member of the core material 1. In the case where the core material 1 is offset by forming a plurality of grid-like vertical and horizontal cutting lines 40 on at least the metal layer 36 which is a gas barrier layer of the outer storage material 31. In addition, heat conduction from the outer storage material 31 to the inner storage material 32 can be suppressed as much as possible, and as a result, the heat insulating performance of the vacuum heat insulating panel can be maintained.

  Conventionally, in order to suppress the heat bridge, the gas barrier bag is made of two laminate films. However, in the present embodiment, the heat bridge can be suppressed, and the gas barrier bag may be made and made of one.

  Further, in this embodiment, the bag 3 is made of two laminated films of the outer storage material 31 and the inner storage material 32, and both the storage materials form a grid-like cutting line 40 in the metal layer, but only on one side. You may make it form in. Also, in this case, when using the vacuum insulation panel in a refrigerator, the side on which this cutting line is formed is the side to be affixed to the outer box made of steel plate, and the laminated film side on which the conventional aluminum foil is arranged over the entire surface On the urethane foam side.

  Further, according to the present embodiment, only the aluminum foil forms the metal layer (gas barrier layer). However, the aluminum vapor deposition layer is formed on the entire nylon layer, for example, and this aluminum vapor deposition layer is formed on the second metal layer ( Gas barrier layer). This aluminum vapor deposition layer improves the gas barrier property. Moreover, since this aluminum vapor deposition layer is very thin compared with an aluminum foil, the heat | fever wraparound by the heat bridge through this aluminum vapor deposition layer is small.

  Moreover, in this embodiment, although the vacuum heat insulation panel was used for the refrigerator main body, you may use not only this but for the heat insulation door 16 which obstruct | occludes the front opening of the said inner box 12 so that opening and closing is possible.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various alternatives described above without departing from the spirit of the present invention. It includes modifications or variations.

It is sectional drawing of the peripheral part of a vacuum heat insulation panel. It is a top view of a vacuum heat insulation panel. It is a partial longitudinal cross-sectional view of a refrigerator.

Explanation of symbols

1 Core material 3 Bag (storage member)
3A, 3C, 3D polymerization seal (outer edge)
3B Seal (outer edge)
4 Vacuum insulation panel 31 Outer storage material (one storage material)
32 Inner storage material (other storage material)
33 Covering part 36 Metal layer (gas barrier layer)
40 cutting line

Claims (5)

A vacuum insulation panel comprising a heat-insulating core material housed in a gas-shielding housing member and vacuum-sealed, wherein the housing member covers the core material and the outer periphery from the periphery of the coating portion And a metal layer as a gas barrier layer constituting the housing member, wherein a plurality of grid-like cutting lines are formed across the covering portion and the outer edge portion. . A cooling storage room having a heat insulation box body in which a vacuum heat insulation panel formed by housing a core material having heat insulation properties in a housing member having high gas barrier properties and vacuum-sealing is disposed between an outer box and an inner box. In addition, the storage member of the vacuum insulation panel includes a covering portion that covers the core material and an outer edge portion that extends outward from the periphery of the covering portion, and the metal layer that is a gas barrier layer that constitutes the storage member includes A cooling storage, wherein a plurality of grid-like cutting lines are formed between the covering portion and the outer edge portion. A laminate film comprising a housing member for housing a core material of a vacuum heat insulating panel and having a gas barrier layer made of a metal foil, wherein a laminate portion is provided for forming the metal foil into a thin cut shape. The laminate film according to claim 3, wherein the spacing portion is formed by providing linear spacing portions in a lattice shape. The laminate film according to claim 3 or 4, further comprising a second gas barrier layer made of a metal vapor deposition layer provided on the entire surface.

Images