JP2011106653A - Packing material for vacuum thermal insulation panel, and vacuum thermal insulation panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a thermal insulation zone in a packing material without weakening the joint of a bag of a vacuum thermal insulation panel while increasing a degree of freedom of the packing material with respect to a core material in the vacuum thermal insulation panel. <P>SOLUTION: A packing material 1 comprises a base-material film, an aluminum foil 10, and a surface protective film. The aluminum foil 10 of the packing material is removed so as to provide a thermal insulation zone 10a. A bag is formed by the packing material having the thermal insulation zone. A vacuum thermal insulation panel is manufactured by vacuum-packing a core material 20 into the bag. The thermal insulation zone 10 is provided in a continuous loop form at a position inside from a margin 10c being a heat seal part and apart by a distance W<SB>1</SB>from the edge line 21d of the core material 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-barrier packaging material used for a vacuum insulation panel mainly used as a thermal insulation material for refrigerators, electric pots, etc., and a vacuum insulation panel in which a core material is packaged with this packaging material.

  Conventionally, heat insulating materials such as glass wool and foamed synthetic resin have been widely used as heat insulating materials for home appliances, but in recent years, the demand for energy saving has increased, and higher performance heat insulating materials have been demanded. Vacuum insulation panels are attracting attention.

  This vacuum insulation panel is generally made of an inorganic porous molded body made of inorganic powder such as pearlite powder, an organic porous molded body made of foamed synthetic resin, fiber such as glass fiber or ceramic fiber, etc. as a core material. A bag body (container) formed of a packaging material made of a highly barrier film or sheet is loaded, and the bag body is evacuated, and then the bag body is sealed. And in order to increase and maintain the degree of vacuum inside the bag body, a laminate of metal foil such as aluminum foil is often used as the packaging material having a high barrier property, and when the bag body is formed, A heat seal part is formed by overlapping the packaging material on the peripheral part. However, since the metal foil has extremely high thermal conductivity, heat conduction occurs on the front surface side (one surface side) and the back surface side (other surface side) of the bag through such a seam (margin). For example, when a vacuum heat insulating panel is loaded on the wall surface of the refrigerator, the outer surface of the refrigerator wall surface is exposed to the outside air, and the inner surface of the wall surface is exposed to the cool air in the refrigerator. Therefore, one surface of the vacuum heat insulating panel is exposed to a relatively high temperature due to the influence of outside air, and the other surface is exposed to a relatively low temperature due to the influence of cool air inside the cabinet. However, as described above, heat conduction occurs through the seam (margin) where the front surface and the back surface (one surface and the other surface) of the vacuum heat insulating panel are located on the side surfaces, so that there is a problem that the heat insulating property is greatly hindered.

  Therefore, as disclosed in Patent Documents 1 and 2, it has been proposed to form a heat insulating band by removing the metal foil on the seam or side of the packaging material. However, it is common to use a metal foil with a relatively large thickness in order to improve the barrier property, and the portion of the heat insulating zone from which this metal foil has been removed may cause the packaging material to become fragile. When the packaged heat insulation panel is attached to a refrigerator or the like, the side end face of the heat insulation panel is generally supported, and a load is easily applied to the side end face.

  In addition, since the overlapping seams (margins) and side end surfaces of the packaging material are narrow, there is a problem that a heat insulating band having a sufficient width cannot be provided, and that the heat insulating band cannot be formed in a free pattern.

  One problem with the above vacuum insulation panel is that when the core material is wrapped in a slanted state in the packaging bag, heat is transferred directly from the side end surface to the packaging material on the other side, and the insulation band becomes useless. It is.

  Therefore, Patent Document 3 discloses a vacuum heat insulation panel in which the metal thin film on the side end face is completely removed. However, in this case, the barrier property and heat insulation performance are lowered on the side end face, and the heat insulation performance as a whole panel is remarkably lowered. To do.

  A common problem with packaging materials used in these vacuum insulation panels is that the packaging material must be replaced because the location of the insulation zone of the packaging material varies with the size of the vacuum insulation panel. Therefore, Patent Document 4 proposes forming a grid-like cutting line in a metal layer of a storage material (packaging material). However, this technique also has more cutting lines (heat insulation bands) than the above-mentioned ones, and not only weakens the seam that becomes the joint when the bag is formed, but also impedes barrier properties. Arise.

  In addition, Patent Document 5 describes a technique in which a spacer is interposed at a seam (joint portion) of the bag body. However, a thermal bridge is formed when the end surface of the packaging material comes into contact with the spacer, so that the spacer is fixed. The above-mentioned thickness is required, and not only the number of members increases, but it is necessary to provide them all around the seam, which is inferior in manufacturing.

Japanese Utility Model Publication No. 60-142928 JP 60-256700 A Japanese Patent Laid-Open No. 5-272864 JP 2006-70951 A Japanese Patent Laid-Open No. 10-185417

  Therefore, an object of the present invention is to form a heat insulation band with a free pattern on the packaging material without weakening the joint of the bag body of the vacuum heat insulation panel, and to increase the degree of freedom of the packaging material with respect to the core material. .

  In order to solve the above problems, the present invention comprises a laminate in which a base film is provided on one surface of an aluminum foil, a surface protection film is provided on the other surface, and a heat insulating band is formed by removing a part of the aluminum foil into a strip shape. In the vacuum heat insulating panel packaging material, the heat insulating band is formed so as to be continuous in a loop shape on the inner side of the heat seal portion provided at the peripheral portion of the bag body in order to form the bag body with the packaging material. It is. The heat insulation band as a whole forms a square loop with substantially straight sides, and the heat insulation band is a predetermined distance inward from the edge line that is a corner between one side surface and the side end surface of the core material vacuum-packed by the packaging material. It is preferable to be positioned.

  The heat insulation band may be any one of a continuous regular waveform, a circle, an ellipse, and a polygon, and a loop may be formed as a whole. The width of these heat insulating bands is preferably 0.05 mm to 100 mm.

  A bag body is formed using the packaging material as described above, and the core material is vacuum packaged to form a vacuum heat insulation panel.

  According to the present invention, as described above, the heat-insulating band is disposed on the inner side of the heat seal portion of the packaging material, preferably on the inner side of the edge line of the core material, so that the side on which the load is applied during handling and installation. A vacuum heat insulating panel with excellent strength is obtained without the weakened portion from which the aluminum foil is removed on the end face.

  Further, if the linear shape of the heat insulating band is appropriately selected, even if the position of the core material to be vacuum-packed is slightly deviated, no ridges or wrinkles are produced during the packaging, and the strength is not lowered. Accordingly, it is possible to form several types of bags that wrap core materials of different sizes with a single packaging material.

Sectional drawing which shows an example of the packaging material of this invention Sectional drawing which shows the other example of the packaging material of this invention Plan view showing an example of aluminum foil for packaging material The top view which shows the other example of the aluminum foil of a packaging material Plan view showing another example of aluminum foil for packaging material The top view which shows another example of the aluminum foil of a packaging material Partially enlarged sectional view of vacuum insulation panel Schematic diagram showing various examples of heat insulation bands provided on aluminum foil Partially enlarged perspective view of vacuum insulation panel

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The packaging material for a vacuum insulation panel may be any laminated structure in which an aluminum foil (hereinafter, including an aluminum alloy foil) is interposed. For example, as shown in FIG. 1, on one surface of an aluminum foil 10 as a barrier layer. The packaging material 1 which laminated | stacked the base film 11 and the surface protection film 12 on the other surface, and provided the heat seal layer 13 on the outer surface of the base film 11 is mention | raise | lifted. In addition, as shown in FIG. 2, the packaging material 1 which inserted the vapor deposition film 14 which provided the metal or ceramic vapor deposition layer 14a between the aluminum foil 10 and the surface protection film 12 may be sufficient. Further, the films 11 and 12 are not limited to a single layer, and may be a composite film by coextrusion or lamination. As a method for laminating these films and layers, known means such as dry lamination, wet lamination, and coating can be employed.

  As the material of the films 11, 12, and 14, synthetic resin films such as polyester, polyethylene, polypropylene, nylon, polyvinyl alcohol, and polyvinyl chloride are used. The same material is used for the heat seal layer 13, but polyethylene, particularly high density polyethylene (HDPE) is preferred.

  As shown in FIG. 3, the aluminum foil 10 that is a barrier layer of the packaging material 1 is provided with a heat insulating band 10 a obtained by removing the aluminum foil 10 into a linear shape or a strip shape. The heat insulating band 10a is obtained by laminating the aluminum foil 10 on the base film 12, and then etching the aluminum foil 10 according to a conventional method to remove the aluminum foil in a linear or belt shape. The width W of the heat insulating zone 10a is preferably about 0.05 mm to 100 mm. This width W mainly depends on the size of the vacuum heat insulation panel.

  As shown in FIG. 3, the heat insulating zone 10a forms one continuous loop (continuous ring) as a whole. And it is inside by a predetermined distance (to be described later) inside a portion 10c (hereinafter referred to as margin 10c) corresponding to a heat seal portion for forming a bag body for packaging the core material of the vacuum heat insulation panel with the packaging material 1. The heat insulating zone 10a is formed.

  The overall shape of the heat insulating band 10a is generally similar to the rectangular or square aluminum foil 10, but may be provided so as to form a double loop as shown in FIG. Of course, it may be double or more. Moreover, as shown in FIG. 5, you may provide so that the heat insulation zone | band 10a may form two independent loops. Also in this case, the loop can be doubled as shown by the chain line. Further, as shown in FIG. 6, three independent loops can be provided. When the heat insulating band 10a as shown in FIGS. 5 and 6 is provided, for example, when used for a vacuum heat insulating panel of a refrigerator in which a freezing room and a refrigerating room are separated, the refrigerating room is formed from a barrier layer (aluminum foil 10). The heat transfer can be cut off. In addition, it is preferable to make the corner part of the heat insulation zone 10a into a round shape as shown in the figure, and the other part is substantially linear.

As described above, the packaging material 1 is formed using the aluminum foil 10 provided with the heat insulating band 10a, and two sheets of the packaging material 1 are overlapped, and the portion corresponding to the margin 10c is sealed in three directions, and one is opened. The rectangular plate-shaped core material is inserted through this opening, and after evacuation, the opening is further heat-sealed to form a vacuum heat insulating panel. The completed vacuum insulation panel is shown in FIG. As illustrated, the packaging material 1 is in close contact with the one surface 21a, the other surface 21b, and the side surface (end surface) 21c of the core material 20 by vacuuming. The heat insulating band 10a, be pre-disposed to be positioned from the margin 10c (heat-sealed portion) a predetermined distance, i.e., at a location away from the side end face 21c by a distance W ₁ of one side 21a or other surface 21b of the core member 20 Thus, as is apparent from the figure, the aluminum foil 10 covering one surface 21a of the core material 20 of the plate-like vacuum heat insulating panel and the aluminum foil 10 covering the other surface 21b are completely thermally disconnected. The wrapping material 1 is tightly adsorbed and closely adhered to one surface (front surface) 21a and the other surface (back surface) 21b of the core material 20 when evacuated, and is formed on the side surface (end surface) 21 and margin 10c where gaps are likely to occur. Since there is no portion from which the aluminum foil 10 has been removed, the side surface (end surface) portion of the bag body, which is easily loaded during handling and installation, is not damaged. The distance W ₁ is about 5 mm to 100 mm, and is determined mainly depending on the size of the vacuum heat insulating panel.

  Although each side of the heat insulating band 10a is formed in a substantially straight line, it can be formed so as to draw a regular curve as shown in FIG. FIG. 8A shows a regular corrugated heat insulating zone 10b. The amplitude and cycle length of the waveform can be selected as appropriate. For example, the amplitude is 10 mm to 100 mm, and the length is preferably about 10 mm to 100 mm. Of course, the width of the heat insulating band 10b is 0.05 mm to 100 mm as in the heat insulating band 10a, and as a whole, a rectangular or square loop as shown in FIGS. 3 to 6 is formed and provided inside the margin 10c. The waveform is not limited to a smooth curve as shown in the figure, but may be a polygon such as a triangle or a rectangle. As shown in FIGS. 8B and 8C, it may be a regular waveform protruding only on one side. The height and width of the waveform are about 10 mm to 100 mm. As shown in FIG. 8D, the heat insulating zone 10b may be formed by continuing a circular or elliptical shape. In this case, it may be connected in a chain with adjacent ones, and a polygon may be used instead of a circle. Their maximum diameter is about 10 mm to 100 mm. Here, the term “regular” is not limited to adjacent ones having, for example, the same wave shape, but also includes a cyclic regularity that gradually changes from a large waveform to a small waveform and then changes from a large waveform to a small waveform. .

  When the heat insulating zone 10b as described above is employed, there are the following advantages. In the case of the heat insulating band 10a shown in FIGS. 3 to 6 described above, when the core material 20 is packaged with the bag formed by the packaging material 1 as shown in FIG. 7, the core material 20 is in a normal position in the bag. In other words, the heat insulation band 10a and the other surface 21b (may be one surface 21a) of the core material 20 and the corner (edge line) 21d between the side surface (end surface) 21c may be close to or cross each other. When vacuuming is performed in such a state, the packaging material 1 is first bent along the heat insulating band 10a before the packaging material 1 is adsorbed by the core material 20 and bent along the edge line 21d. The material 1 may have ridges or wrinkles.

  On the other hand, when the heat insulating band 10b as shown in FIG. 8 is adopted, even if it approaches or intersects the edge line 21d of the core material 20, it does not bend along the heat insulating band 10b. If this is utilized, the heat insulation zone 10b can have a degree of freedom from a position inside the edge line 21d as shown in FIG. 7 to a position straddling (overlapping) the edge line 21d as shown in FIG. That is, by preparing and preparing several types of bags in advance with the packaging material 1 having the same size of the heat insulating band 10b, several types of different outer peripheral lengths (total length of one surface 21a + other surface 21b + both side surfaces 21c) are obtained. The core material 20 can be packaged. For example, as shown in FIG. 9, there is no problem even if the heat insulating band 10b is formed across the edge line 21d, and no ridges or wrinkles occur in the packaging material 1 during vacuum packaging. At this time, the aluminum foil 10 is continuous with the surface side and there are few removed parts on the side surface 21c even at a portion where a part of the heat insulating band 10b is located on the side surface (end surface) 21c of the core material 20. There is almost no vulnerability.

DESCRIPTION OF SYMBOLS 1 Packaging material 10 Aluminum foil 10a, 10b Heat insulation zone 10c Margin 11 Base film 12 Surface protection film 13 Heat seal layer 14 Deposition film 14a Deposition layer 20 Core material 21a One side 21b of core material 21c Other side 21c of core material (End face)
W Width of insulation zone W ₁ Distance from the edge of the core material of insulation zone

Claims (6)

  A packaging material comprising a laminate in which a base film is provided on one surface of the aluminum foil and a surface protection film is provided on the other surface, and a heat insulation band is formed by removing a part of the aluminum foil in a strip shape. A packaging material for a vacuum heat insulation panel, which is formed so as to be continuous in a loop shape on the inner side of the heat seal portion provided on the peripheral portion of the bag body in order to form the bag body.   The heat insulating band as a whole forms a square loop with each side being substantially straight, and is located on the inner side of an edge line that is a corner between one surface and a side end surface of the core material vacuum-packed by the packaging material. Item 2. A packaging material for a vacuum insulation panel according to Item 1.   The packaging material for a vacuum heat insulation panel according to claim 1, wherein the heat insulation band is formed of a continuous regular waveform and forms a continuous loop as a whole.   The vacuum insulating panel packaging material according to claim 1, wherein the heat insulating band is formed of any one of a continuous regular circle, an ellipse, and a polygon, and forms a continuous loop as a whole.   The vacuum insulating panel packaging material according to any one of claims 1 to 4, wherein a width of the heat insulating band is 0.05 mm to 100 mm.   The vacuum heat insulation panel which vacuum-packed the core material using the packaging material for vacuum heat insulation panels in any one of Claims 1-5.

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