JP2019019866A - Coated vacuum heat insulation material - Google Patents

Abstract

To provide a coated vacuum heat insulation material that has excellent heat insulation performance, and includes a vacuum heat insulation material coated with a heat shrinkage film.SOLUTION: A coated vacuum heat insulation material has a vacuum heat insulation material, and a heat shrinkage film that coats the vacuum heat insulation material. The vacuum heat insulation material has a polygonal tabular shape. The heat shrinkage film is in close contact with at least outer peripheral surface of the vacuum heat insulation material. In a region within 70 mm from the corner part of the coated vacuum heat insulation material, there is at least one deaeration pore for air release with an area of 0.1-5 cm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coated vacuum heat insulating material obtained by coating a vacuum heat insulating material with a heat shrink film.

  In recent years, energy saving and resource saving are strongly desired from the viewpoint of global warming prevention and the like. In particular, efficient use of thermal energy in the fields of household, commercial appliances such as refrigerators, freezers, heat insulation boxes, jar rice cookers, water heaters, vending machines, automobiles, photocopiers, floor heating, and houses. From the viewpoint of doing, a vacuum heat insulating material is used.

  Refrigerators and the like are mainly insulated with a vacuum heat insulating material and a urethane foam material. There is a resin casing inside the refrigerator, and the vacuum heat insulating material is attached to the casing, and the space around it is filled with urethane foam. After affixing the vacuum heat insulating material to the housing inside the refrigerator, when the urethane foaming agent is injected, the urethane foam material may enter the gap between the ear folds of the vacuum heat insulating material. When the urethane foam material enters the gap between the ear folds of the vacuum heat insulating material, the fluidity and filling properties of the urethane foam material are deteriorated.

  Patent Document 1 discloses a vacuum heat insulating material in which the outer peripheral edge surface and the ear fold are covered with a heat-shrinkable heat-shrinkable material for protection from external impacts and prevention of peeling of the ear fold. In Patent Document 1, by enclosing a vacuum heat insulating material with a heat-shrinkable material, urethane is prevented from entering the gaps between the ear folds, and the fluidity and filling properties of the urethane foam in the refrigerator are improved.

Japanese Patent Laid-Open No. 2006-89962

  However, if the heat-shrinkable film is simply heat-shrinked to enclose the vacuum heat insulating material, air remains between the heat-shrinkable film and the vacuum heat insulating material. Since the thermal conductivity of air is higher than the thermal conductivity of vacuum insulation, if air remains between the heat shrink film and the vacuum insulation, the insulation performance of the entire vacuum insulation covered with the heat shrink film is The problem that it will fall rather than the heat insulating material itself arises. In general, heat-shrinkable films with many small vents are known so that air between the film and the vacuum insulation can escape during heat-shrinking. Even when a heat-resistant film is used, a certain amount of air remains between the heat-shrinkable film and the vacuum heat insulating material, so that the heat insulating performance of the obtained coated vacuum heat insulating material is not sufficient.

  The subject of this invention is providing the coating | cover vacuum insulation material which coat | covered the vacuum insulation material with the heat-shrink film which has the outstanding heat insulation performance.

It has been found that the above problem can be solved by providing at least one air releasing deaeration hole having an area of 0.1 to 5 cm ^{2 at} the corner of the coated vacuum heat insulating material. That is, the present invention relates to the following [1] to [11].

[1] A coated vacuum heat insulating material comprising a vacuum heat insulating material and a heat shrink film covering the vacuum heat insulating material,
The vacuum heat insulating material is a polygonal plate,
The heat shrink film is in close contact with at least the outer peripheral surface of the vacuum heat insulating material;
The covering vacuum heat insulating material has at least one deaeration hole in a region within 70 mm from at least one corner of the covering vacuum heat insulating material on the outer peripheral surface;
The deaeration holes have an area of 0.1 to ⁵ cm ² ;
Covered vacuum insulation.

[2] The coated vacuum heat insulating material according to [1], wherein an air amount between an upper surface and a lower surface of the vacuum heat insulating material and the heat shrinkable film is 0 to 10 cm ³ / m ² .

[3] The above-mentioned [1] or [2], wherein the covering vacuum heat insulating material has at least one deaeration hole in a region within 70 mm from at least three corners of the covering vacuum heat insulating material on the outer peripheral surface. Coating vacuum insulation.

[4] The coated vacuum heat insulating material according to any one of [1] to [3], wherein the heat shrinkable film does not have a vent hole on the upper surface and the lower surface of the coated vacuum heat insulating material.

[5] The coated vacuum heat insulating material according to any one of [1] to [4], wherein the vacuum heat insulating material has a square plate shape.

[6] The following steps:
1. A step of putting a polygonal plate-like vacuum heat insulating material into a polygonal bag made of non-heat-shrinkable film, wherein the bag has an opening, and the non-heat-shrinkable film has a thickness of 20 to 200 μm. Having a process,
2. Sealing the opening;
3. Cutting at least a portion of the sealed bag, the at least a portion including the apex of the bag;
4). 4. Heat-shrink the cut bag at 80 ° C. to 200 ° C., and Cooling the heat-shrinked bag to 50 ° C. or lower,
The manufacturing method of the covering vacuum heat insulating material as described in said [1] containing.

[7] The following steps:
1. A step of cutting at least a part of a polygonal bag made of an unheat-shrinkable film, wherein the bag has an opening, the unheat-shrink film has a thickness of 20 to 200 μm, and the at least one A process wherein the part includes the apex of the bag;
2. A step of placing a polygonal plate-like vacuum heat insulating material into the cut bag;
3. Sealing the opening;
4). 4. Heat-shrink the sealed bag at 80 ° C. to 200 ° C., and Cooling the heat-shrinked bag to 50 ° C. or lower,
The manufacturing method of the covering vacuum heat insulating material as described in said [1] containing.

[8] The method according to [6] or [7], wherein a length of two sides constituting the apex in at least a part of the bag to be cut is 70 mm or less.

[9] The non-heat-shrinkable film is a monolayer or multilayer film selected from the group consisting of a polyvinyl chloride film, a polystyrene film, a polyethylene film, a polypropylene film, an ethylene vinyl alcohol resin film, and a polyolefin film, [6] The method according to any one of [8].

[10] The method according to any one of [6] to [9], wherein the shrinkage ratio of the unheat-shrinkable film is 10 to 80%.

[11] The method according to any one of [6] to [10], wherein the unheat-shrinkable film has a tensile strength of 70 to 1800 kg / cm ² .

  According to the present invention, there is provided a coated vacuum heat insulating material having an excellent heat insulating performance, in which a vacuum heat insulating material is coated with a heat shrink film.

FIG. 1 shows a rectangular plate-like vacuum heat insulating material shape. FIG. 2 shows a square bag made of an unheat-shrinkable film and a cut portion thereof. FIG. 3 shows the cut portion of the bag.

The present invention is a coated vacuum heat insulating material comprising a vacuum heat insulating material and a heat shrinkable film covering the vacuum heat insulating material, wherein the vacuum heat insulating material is a polygonal plate, and the heat shrinkable film is It is in close contact with at least the outer peripheral surface of the vacuum heat insulating material, and the coated vacuum heat insulating material has at least one deaeration hole in an area of 70 mm or less from at least one corner of the coated vacuum heat insulating material on the outer peripheral surface. And the said deaeration hole is a covering vacuum heat insulating material which has an area of 0.1-5 cm < ² >.

  The coated vacuum heat insulating material of the present invention includes a vacuum heat insulating material. The vacuum heat insulating material includes a core material and a gas barrier film, and may include an adsorbent. The core material is sealed under reduced pressure in the gas barrier film. As a vacuum heat insulating material, the thing of a prior art can be especially used without a restriction | limiting.

As a core material used for this invention, what is used in the vacuum heat insulating material field | area can be especially used without a restriction | limiting. For example, inorganic fibers, fibers in which inorganic fibers and organic fibers are mixed, powder core materials mainly composed of silica particles, foam heat insulating materials, and the like can be used as the core materials. The main component of the core material is preferably glass fibers or silica particles containing SiO ₂ .
Core materials are known and are readily available in the market or can be prepared.

  The gas barrier film used in the present invention is not particularly limited as long as it is a film having a gas barrier property, but is preferably a laminate of a seal layer and a gas barrier layer. The seal layer, the gas barrier layer, and the resin are sequentially formed from the side in contact with the core material. What laminated | stacked the film layer is more preferable. The thickness of the gas barrier film is not particularly limited, but is usually 5 to 60 μm, and preferably 6 to 30 μm. A gas barrier layer is a layer which does not permeate | transmit gas, and is used from a viewpoint which prevents the fall of the vacuum degree of a vacuum heat insulating material.

  Examples of the gas barrier layer include metal foil and a laminated film (deposited film) obtained by vapor deposition on a resin film. Examples of the metal of the metal foil include aluminum, copper, stainless steel, and iron. Preferably, aluminum is used. The vapor deposition film is formed by vapor deposition of a metal such as aluminum, stainless steel, cobalt, nickel, or the like, silica, alumina, or a combination thereof by a vapor deposition method, a sputtering method, or the like. Examples of the resin film used as the base material for the deposited film include aromatic polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyolefin resins such as polyethylene, polypropylene and olefin copolymers; polyvinyl chloride , Vinyl chloride resins such as vinyl chloride copolymer; polyamide resins such as nylon 6, nylon 66, metaxylylenediamine / adipic acid condensate; polyvinyl alcohol, acrylonitrile / butadiene / styrene copolymer, acrylonitrile / styrene copolymer Styrenic resin such as coalesc; acrylic resin such as polymethyl methacrylate, acrylic acid ester and methyl methacrylate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl alcohol and partially saponified A film produced from a thermosetting resin such as a thermoplastic resin such as a cured resin, a phenol resin, or a urea resin is used. The gas barrier layer is preferably an aluminum foil. Although the thickness of a gas barrier layer does not have a restriction | limiting in particular, Usually, it is 5-60 micrometers, Preferably it is 6-30 micrometers. The metal foil and vapor deposition film used for the gas barrier layer are known and can be easily obtained or prepared in the market.

The seal layer is a resin that can be fused by heating. There is no particular limitation as long as the resin can be heat-sealed. Specifically, a film made of a polyolefin resin such as polyethylene or polypropylene, polyacrylonitrile, PET, an ethylene-vinyl alcohol copolymer, or a mixture thereof can be used. Preferably, polyethylene, polypropylene, and ethylene-vinyl alcohol copolymer are used. The polyethylene preferably has a density of 0.90 to 0.98 g / cm ³ . The polypropylene preferably has a density of 0.85 to 0.95 g / cm ³ . Although there is no restriction | limiting in particular in the thickness of a sealing layer, Usually, it is 10-100 micrometers, Preferably it is 25-60 micrometers. Resins used for the sealing layer are known and can be easily obtained in the market or can be prepared.

  The resin film layer is a layer arbitrarily provided on the gas barrier layer for the purpose of protecting the gas barrier layer. As the resin film layer, aromatic polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyolefin resins such as polyethylene, polypropylene and olefin copolymers; polyvinyl chloride, vinyl chloride copolymers and the like Polyvinyl resins such as nylon 6, nylon 66, metaxylylenediamine / adipic acid condensates, etc .; styrene resins such as polyvinyl alcohol, acrylonitrile / butadiene / styrene copolymers, acrylonitrile / styrene copolymers; Films made from thermoplastic resins such as acrylic resins such as polymethyl methacrylate, acrylic acid ester and methyl methacrylate copolymer, and thermosetting resins such as phenol resin and urea resin are used. Preferably, PET, nylon 6 or nylon 66 is used. Organic and inorganic fillers can also be added to these resin films. These resins can be used alone or in admixture of two or more. In order to further improve the gas barrier performance of the gas barrier film, a gas barrier resin obtained by polymerizing and copolymerizing vinyl monomers such as vinylidene chloride, acrylonitrile, and vinyl alcohol is applied to the resin film layer or laminated. These particles can be mixed and dispersed in the resin film layer. Although there is no restriction | limiting in particular in the thickness of a resin film layer, Usually, it is 5-40 micrometers, Preferably it is 10-30 micrometers. Resins used for the resin film layer are known and can be easily obtained in the market or can be prepared.

  The adsorbent used in the present invention is not particularly limited as long as it is a substance that adsorbs gas. For example, it is a substance that adsorbs gas such as nitrogen, oxygen, carbon dioxide, and / or moisture. Examples of the adsorbent include calcium oxide, magnesium oxide, silica gel, zeolite, activated carbon, barium oxide, barium-lithium alloy, porous coordination polymer, metal organic structure, or a mixture thereof. From the viewpoint of gas adsorption performance and productivity, calcium oxide is preferable. Adsorbents are known and can be readily obtained in the market or can be prepared.

  The internal pressure of a vacuum heat insulating material is 0.5-20 Pa, for example, Preferably it is 0.5-10 Pa. If the internal pressure is within the above range, heat conduction through the gas inside the vacuum heat insulating material can be suppressed, so that the heat insulating property of the vacuum heat insulating material can be improved.

  In the present invention, the vacuum heat insulating material is generally a quadrangular plate, and may have another polygonal shape, for example, a pentagon or more, depending on the application. A rectangular plate-like vacuum heat insulating material shape is shown in FIG. The plate shape means a thin and flat shape, and has two opposing surfaces (upper surface 1 and lower surface 2 in FIG. 1) and an outer peripheral surface (four side surfaces 3 in FIG. 1) connecting these two surfaces. In this specification, the “corner portion” refers to the short side (side in the thickness direction) of the outer peripheral surface (side 4 in FIG. 1). The size of the vacuum heat insulating material can be appropriately set depending on the application, but a small one is about 200 mm square, and a large one is about 1000 mm × 2000 mm.

  The coated vacuum heat insulating material of the present invention includes a heat shrink film that covers the vacuum heat insulating material. In the present specification, the “heat-shrinkable film” refers to a film after heat-shrinking. The “non-heat-shrinkable film” or “heat-shrinkable film” refers to a film before being heat-shrinked.

  The heat shrink film is in close contact with at least the outer peripheral surface of the vacuum heat insulating material. When the heat-shrinkable film is in close contact with at least the outer peripheral surface, heat loss from the heat-shrinkable film can be suppressed, and the coated vacuum heat insulating material can exhibit sufficient heat insulating performance.

In the conventional coated vacuum heat insulating material, air of about 100 to 250 cm ³ / m ² is often left between the upper and lower surfaces of the vacuum heat insulating material and the heat shrink film. On the other hand, in the present invention, the amount of air between the upper and lower surfaces of the vacuum heat insulating material and the heat shrinkable film is, for example, 0 to 10 cm ³ / m ² . The amount of air can be measured, for example, based on a value obtained by subtracting the volume of the vacuum heat insulating material and the volume of the heat shrinkable film from the volume of the coated vacuum heat insulating material. If the amount of air between the upper and lower surfaces of the vacuum heat insulating material and the heat-shrinkable film is within the above range, it is possible to suppress a decrease in the heat insulating performance of the coated vacuum heat insulating material.

  In the outer peripheral surface, the coated vacuum heat insulating material of the present invention has at least one corner of the coated vacuum heat insulating material, for example, at least two corners, preferably at least three corners, more preferably within 70 mm from all the corners. , Preferably at least one deaeration hole in an area within 50 mm, more preferably within 30 mm. In this invention, a deaeration hole points out the part which is not coat | covered with the heat-shrink film of the surface of a covering vacuum heat insulating material which has an area mentioned later. For example, the deaeration hole may be a hole provided in the heat-shrinkable film, or may be a gap portion of the film when a belt-like film is wound in the vertical direction and the horizontal direction of the vacuum heat insulating material. Good. An example of the above region is shown as region 5 in FIG. The position of the deaeration hole is specified based on the position of the end of the deaeration hole farther from the corner. The deaeration holes may extend over a plurality of surfaces of the coated vacuum heat insulating material. When the position of the deaeration hole is within the above range, the adhesion between the heat shrink film and the vacuum heat insulating material can be maintained. Further, it is possible to prevent the film from being damaged due to heat shrinkage during the production of the coated vacuum heat insulating material.

In the present invention, the deaeration holes have an area of 0.1 to ⁵ cm ² , preferably 0.2 to ⁴ cm ² , more preferably 0.3 to ³ cm ² . When the deaeration hole extends over a plurality of surfaces of the coated vacuum heat insulating material, the area of the hole is specified based on the area of the portion of the vacuum heat insulating material exposed from the deaeration hole. If the area of the deaeration hole is within the above range, the air between the film and the vacuum heat insulating material is easily released during the heat shrinkage of the non-heat shrinkable film, and the remaining air amount between the heat shrinkable film and the vacuum heat insulating material. Can be reduced sufficiently. Further, it is possible to prevent the film from being damaged due to heat shrinkage during the production of the coated vacuum heat insulating material. Furthermore, when injecting urethane foam during the manufacture of refrigerators, urethane foam can be prevented from flowing between the vacuum heat insulating material and the heat-shrinkable film through the deaeration holes at the corners, and the fluidity and filling of the urethane foam. It can prevent a decline in sex.

  In the present invention, the heat-shrinkable film may have the same air holes as those of the conventional heat-shrinkable film, for example, on the upper surface and / or the lower surface of the coated vacuum heat insulating material.

  The coated vacuum heat insulating material of the present invention is (1) a step of putting a polygonal plate-shaped vacuum heat insulating material into a polygonal bag made of an unheat-shrinkable film, wherein the bag has an opening, The non-heat-shrinkable film has a thickness of 20 to 200 μm, (2) the step of sealing the opening, and (3) the step of cutting at least a part of the sealed bag, the at least part of Including the apex of the bag, (4) a step of heating the cut bag at 80 ° C. to 200 ° C. and thermally shrinking, and (5) a step of cooling the heat-shrinked bag to 50 ° C. or less, It can manufacture by the method containing.

  The unheat-shrinkable film has a thickness of 20 to 200 μm, preferably 40 to 160 μm, more preferably 60 to 120 μm. When the thickness is within the above range, the protection property of the heat-shrinkable film is increased, and damage to the coated vacuum heat insulating material can be prevented.

The shrinkage ratio of the non-heat-shrinkable film varies depending on the resin material of the non-heat-shrinkable film, but is adjusted to, for example, 10% to 80%, preferably 10% to 50%. The shrinkage rate is the length of the non-heat-shrinkable film and the film after heat-shrink when the non-heat-shrinkable film is heated and shrunk for 1 minute or more at a temperature higher than the shrinkage temperature of the non-heat-shrinkable film and lower than the melting temperature. The length ratio can be measured. If the shrinkage rate is within the above range, the air between the film and the vacuum heat insulating material can be sufficiently extracted from the deaeration hole without changing the shape of the vacuum heat insulating material due to the shrinkage of the unheat-shrinkable film. Furthermore, non-heat-shrinkable film preferably 70~1800kg / cm ^2, more preferably 300~1000kg / cm ^2, more preferably has a tensile strength of 500~800kg / cm ^2. The tensile strength can be measured by a known method, for example, according to JIS K 7127. If the tensile strength is within the above range, the heat-shrinkable film is protective and the coated vacuum heat insulating material is easy to handle. The non-heat-shrinkable film may have the same air holes as those of the conventional heat-shrinkable film.

  The non-heat-shrinkable film may be a single layer or a multilayer film, and the material is not particularly limited as long as it has the above-described heat shrinkage rate. Preferred films include, for example, polyvinyl chloride film, polystyrene film, polyethylene film, polypropylene film, polyolefin film, polyethylene terephthalate film, Teflon film, polyamide film, polyetheretherketone film, fluororesin film, and polyethylene vinyl alcohol resin. Examples thereof include a film or a multilayer heat-shrink film containing these.

  In the step (1), the bag made of the non-heat-shrinkable film has an opening from which a vacuum heat insulating material can be put. There is no restriction | limiting in particular in the means of putting a vacuum heat insulating material in a bag. The bag preferably has the same shape as the surface of the vacuum insulation.

  In the step (2), the means for sealing the opening of the bag containing the vacuum heat insulating material is not particularly limited, and for example, it can be sealed by a heat seal method, a hot plate method, an impulse seal method, or laser welding. By sealing the opening, the vacuum heat insulating material can be held inside the non-heat-shrinkable film.

Step (3) is a step of cutting at least a part of the bag. The cut portion may include a portion of the sealed opening. FIG. 2 shows the bag and its cut portion when the bag is square, and FIG. 3 shows the enlarged cut portion. As shown in FIG. 2, the cutting portion 6 includes the apex 7 of the bag. Further, as shown in FIG. 3, the length of the two sides 8 constituting the apex 7 in at least a part of the bag to be cut is, for example, 70 mm or less, preferably 50 mm or less, more preferably 30 mm or less. If the length is within the above range, the cut surface constitutes a deaeration hole having an area of 0.1 to ⁵ cm ^{2 in} an area of 70 mm or less from the corner of the outer peripheral surface in the coated vacuum heat insulating material of the final product. be able to. In addition, by using at least a part including the apex as a cutting portion, it is possible to prevent the film from being damaged during the heat shrinkage of the non-heat shrinkable film. The same applies when the bag is a polygon other than a square. The cutting can be performed, for example, with scissors, a cutter, or the like.

  Step (4) is a step in which the cut bag is heated and thermally contracted, and the heating temperature can be appropriately set based on the shrinkage temperature of the unheat-shrinkable film. It can be adjusted according to the resin material of the shrink film. If the heating temperature is within the above range, the unheat-shrinkable film can be heat-shrinked. The non-heat-shrinkable film can be heated by, for example, a hot air circulation oven, a dryer, or a heater.

  Step (5) is a step of cooling the heat-shrinked bag, and the cooling temperature is 50 ° C. or lower, preferably 40 ° C. or lower. If the cooling temperature is within the above range, the heat shrinkage and deformation of the heat shrinkable film can be stopped. The heat-shrinkable film can be cooled by, for example, a cooler, a fan, or natural cooling.

  In the production of the coated vacuum heat insulating material of the present invention, the bag of unheat-shrinkable film may be cut in advance before putting the vacuum heat insulating material. That is, the coated vacuum heat insulating material of the present invention is a process of (a) cutting at least a part of a polygonal bag made of a non-heat-shrinkable film, wherein the bag has an opening, and the non-heat-shrinkable film (B) a step of putting a polygonal plate-like vacuum heat insulating material into the cut bag, and (c) the opening. A step of sealing the part, (d) a step of heating the sealed bag at 80 ° C. to 200 ° C. to heat shrink, and (e) a step of cooling the heat-shrinked bag to 50 ° C. or less. Can also be manufactured. Steps (a) to (e) can be carried out in the same manner as steps (3), (1), (2), (4) and (5), respectively.

  In another aspect, the coated vacuum insulation of the present invention having deaeration holes at the corners by winding a strip-shaped unheat-shrink film around the vacuum heat insulating material in the longitudinal direction and the transverse direction and thermally shrinking the unheat-shrink film. The material can be manufactured.

  The vacuum heat insulating material of this invention can be used for the same use as the conventional vacuum heat insulating material, for example, a refrigerator, a vending machine, a heat insulation box, etc.

  The coated vacuum heat insulating material of the present invention can be used as a heat insulating material for a refrigerator, for example. Inside the refrigerator, a vacuum heat insulating material is affixed to the housing, and a gap around the case is filled with a urethane foam material or the like. Since the shrinkage wrinkles of the heat-shrinkable film remain at the corners of the conventional coated vacuum heat insulating material, when using the conventional coated vacuum heat insulating material, when injecting the urethane foam into the gap, the urethane foam material There was a problem that the fluidity and filling property of the resin deteriorated. In addition, when a conventional coated vacuum heat insulating material having small air holes on the surface of the heat shrink film is used, the air holes are blocked by urethane foam, so that the air between the heat shrink film and the vacuum heat insulating material is not completely removed. There is also a problem that the heat insulation performance of the refrigerator is adversely affected. In the coated vacuum heat insulating material of the present invention, by providing deaeration holes at the corners, shrinkage wrinkles can be reduced, so that the fluidity and filling properties of urethane can be improved. In addition, since the coated vacuum heat insulating material of the present invention has deaeration holes larger than the conventional vent holes in the corner region, air exists between the heat shrink film of the coated vacuum heat insulating material and the vacuum heat insulating material. Even when urethane is injected, air is pushed out from the deaeration hole, and the heat insulation of the refrigerator can be prevented from being lowered. Furthermore, in the coated vacuum heat insulating material of the present invention, since the heat shrink film is in close contact with the outer peripheral surface of the vacuum heat insulating material, the fluidity and filling properties of the urethane foam are improved.

Example 1
From the opening of a rectangular bag of a polyvinyl chloride film (thickness 75 μm, shrinkage ratio 20% / length 20%, tensile strength 630 kg / cm ² (measured according to JIS K 7127)) without vents A rectangular plate-shaped vacuum heat insulating material (300 mm × 300 mm × 20 mm) was put, and the opening was sealed with an impulse sealer. Four locations including the top of the sealed bag were cut. In each cut portion, the two sides constituting the vertex were 10 mm and 30 mm. The bag was heated at 100 ° C. for 15 seconds in a hot air circulating oven to heat shrink the film. Next, the bag was cooled at an environmental temperature of 25 ° C. by natural cooling to obtain a coated vacuum heat insulating material. The heat shrink film was in close contact with the vacuum heat insulating material on the outer peripheral surface. The coating vacuum heat insulating material has a deaeration hole (minor axis 2 mm and major axis 20 mm) having an area of about 0.3 cm ² at a position 20 mm from the corner (distance from the corner to the distal end of the deaeration hole) on the outer peripheral surface. Oval).

Example 2
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage width 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 mm vertically and horizontally. Four points including the vertex were cut. In each cut portion, the two sides constituting the vertex were 10 mm and 30 mm. A square plate-shaped vacuum heat insulating material (300 mm × 300 mm × 20 mm) was introduced from the opening of the bag, and the opening was sealed with an impulse sealer. The bag was heated at 100 ° C. for 15 seconds in a hot air circulating oven to heat shrink the film. Next, the bag was cooled at an environmental temperature of 25 ° C. by natural cooling to obtain a coated vacuum heat insulating material. The heat-shrinkable film has vent holes (circularity of 1 mm in diameter) having an area of about 0.008 cm ² on the upper and lower surfaces, with an average interval of 48 mm vertically and horizontally, and is in close contact with the vacuum heat insulating material on the outer peripheral surface. It was. The coated vacuum heat insulating material had a deaeration hole (an ellipse with a minor axis of 2 mm and a major axis of 20 mm) having an area of about 0.3 cm ² at a position 20 mm from the corner on the outer peripheral surface.

Example 3
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage ratio 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 m vertically and horizontally. Four points including the vertex were cut. In each cut portion, the two sides constituting the vertex were 10 mm and 20 mm. Subsequent procedures were performed in the same manner as in Example 2 to obtain a coated vacuum heat insulating material. The heat-shrinkable film has vent holes (circularity of 1 mm in diameter) having an area of about 0.008 cm ² on the upper and lower surfaces, with an average interval of 48 mm vertically and horizontally, and is in close contact with the vacuum heat insulating material on the outer peripheral surface. It was. The coated vacuum heat insulating material had a deaeration hole (an ellipse with a minor axis of 1 mm and a major axis of 15 mm) having an area of about 0.1 cm ² at a position 15 mm from the corner on the outer peripheral surface.

Example 4
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage ratio 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 m vertically and horizontally. Four points including the vertex were cut. In each cut portion, the two sides constituting the vertex were 10 mm and 60 mm. Subsequent procedures were performed in the same manner as in Example 2 to obtain a coated vacuum heat insulating material. The heat-shrinkable film has vent holes (circularity of 1 mm in diameter) having an area of about 0.008 cm ² on the upper and lower surfaces, with an average interval of 48 mm vertically and horizontally, and is in close contact with the vacuum heat insulating material on the outer peripheral surface. It was. The coated vacuum heat insulating material had a deaeration hole (an ellipse with a minor axis of 6 mm and a major axis of 60 mm) having an area of about 2.8 cm ² at a position 60 mm from the corner on the outer peripheral surface.

Comparative Example 1
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage ratio 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 mm vertically and horizontally. A coated vacuum heat insulating material was obtained in the same manner as in Example 2 except that it was used without being cut. The heat-shrinkable film had air holes (circularity of 1 mm in diameter) having an area of about 0.008 cm ² on the upper and lower surfaces, with an average interval of 48 mm in the vertical and horizontal directions.

Comparative Example 2
Cut a rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage width 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 1 mm at 50 mm intervals in the vertical and horizontal directions. A coated vacuum heat insulating material was obtained in the same manner as in Example 2 except that the coated vacuum heat insulating material was used. The heat-shrinkable film had vent holes (an ellipse with a minor axis of 2 mm and a major axis of 20 mm) having an area of about 0.3 cm ² on the upper and lower surfaces at an average interval of 40 mm in the vertical and horizontal directions.

Comparative Example 3
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage width 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 mm vertically and horizontally. Four points including the vertex were cut. In each cut portion, the two sides constituting the vertex were 20 mm and 90 mm. Subsequent procedures were performed in the same manner as in Example 2 to obtain a coated vacuum heat insulating material. The heat shrink film was broken from the cut part of the corner.

Comparative Example 4
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage width 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 mm vertically and horizontally. Four points including the vertex were cut. In each cut portion, the two sides constituting the vertex were 1 mm and 5 mm. Subsequent procedures were performed in the same manner as in Example 2 to obtain a coated vacuum heat insulating material. The heat-shrinkable film had air holes (circularity of 1 mm in diameter) having an area of about 0.008 cm ² on the upper and lower surfaces, with an average interval of 48 mm in the vertical and horizontal directions. The coated vacuum heat insulating material had a hole (an ellipse having a minor axis of 0.5 mm and a major axis of 4 mm) having an area of about 0.02 cm ² at a position 4 mm from the corner on the outer peripheral surface.

Comparative Example 5
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage width 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 mm vertically and horizontally. On one side, an area of 10 mm × 30 mm extending from the top to 135 mm to 165 mm was cut. Subsequent procedures were performed in the same manner as in Example 2 to produce a coated vacuum heat insulating material. The heat shrink film was damaged from the cut portion of the outer peripheral surface.

Comparative Example 6
A rectangular bag of polyvinyl chloride film (thickness 75 μm, shrinkage width 20% / length 20%, tensile strength 630 kg / cm ² ) having circular ventilation holes with a diameter of 0.1 mm at intervals of 60 mm vertically and horizontally. On one side, a 10 mm × 30 mm region at the center was cut. Subsequent procedures were performed in the same manner as in Example 2 to produce a coated vacuum heat insulating material. The heat shrink film was broken from the cut part.

Measurement of the amount of air between the upper and lower surfaces of the vacuum heat insulating material and the heat shrinkable film For each of the coated vacuum heat insulating materials of Examples 1 to 4 and Comparative Examples 1 to 6, the upper and lower surfaces of the vacuum heat insulating material and the heat shrinkable film The amount of air was measured by subtracting the volume of the vacuum heat insulating material and the volume of the heat shrinkable film from the volume of the coated vacuum heat insulating material. From the measured air volume, the air volume (internal air volume) per unit area of the upper and lower surfaces was calculated. The results of the coated vacuum heat insulating materials of Examples 1 to 4 are shown in Table 1, and the results of the coated vacuum heat insulating materials of Comparative Examples 1 to 6 are shown in Table 2.

Measurement of thermal conductivity The thermal conductivity of each of the coated vacuum heat insulating materials of Examples 1 to 4 and Comparative Examples 1 to 6 was measured according to JIS A 1412 Annex B method. The results of the coated vacuum heat insulating materials of Examples 1 to 4 are shown in Table 1, and the results of the coated vacuum heat insulating materials of Comparative Examples 1 to 6 are shown in Table 2.

  The vacuum heat insulating material of the present invention is particularly useful as a heat insulating performance improving material for refrigerators, cold boxes, vending machines, and the like.

DESCRIPTION OF SYMBOLS 1 Upper surface 2 Lower surface 3 Outer peripheral surface 4 Corner | angular part 5 The area | region of a fixed range from a corner | angular part 6 Cut | disconnected part 7 Vertex 8 Two sides which comprise a vertex

Claims (11)

A vacuum insulation material comprising a vacuum insulation material and a heat shrink film covering the vacuum insulation material,
The vacuum heat insulating material is a polygonal plate,
The heat shrink film is in close contact with at least the outer peripheral surface of the vacuum heat insulating material;
The covering vacuum heat insulating material has at least one deaeration hole in a region within 70 mm from at least one corner of the covering vacuum heat insulating material on the outer peripheral surface;
The deaeration holes have an area of 0.1 to ⁵ cm ² ;
Covered vacuum insulation. The covering vacuum heat insulating material of Claim 1 whose air quantity between the upper surface and lower surface of the said vacuum heat insulating material, and the said heat shrink film is 0-10 cm < ³ > / m < ² >.   The said covering vacuum heat insulating material is a covering vacuum heat insulating material of Claim 1 or 2 which has an at least 1 deaeration hole in the area | region within 70 mm from the at least 3 corner | angular part of the said covering vacuum heat insulating material in an outer peripheral surface.   The coated vacuum heat insulating material according to any one of claims 1 to 3, wherein the heat shrinkable film does not have a vent hole on an upper surface and a lower surface of the coated vacuum heat insulating material.   The covering vacuum heat insulating material according to any one of claims 1 to 4, wherein the vacuum heat insulating material has a square plate shape. The following steps,
1. A step of putting a polygonal plate-like vacuum heat insulating material into a polygonal bag made of non-heat-shrinkable film, wherein the bag has an opening, and the non-heat-shrinkable film has a thickness of 20 to 200 μm. Having a process,
2. Sealing the opening;
3. Cutting at least a portion of the sealed bag, the at least a portion including the apex of the bag;
4). 4. Heat-shrink the cut bag at 80 ° C. to 200 ° C., and Cooling the heat-shrinked bag to 50 ° C. or lower,
The manufacturing method of the covering vacuum heat insulating material of Claim 1 containing this. The following steps,
1. A step of cutting at least a part of a polygonal bag made of an unheat-shrinkable film, wherein the bag has an opening, the unheat-shrink film has a thickness of 20 to 200 μm, and the at least one A process wherein the part includes the apex of the bag;
2. A step of placing a polygonal plate-like vacuum heat insulating material into the cut bag;
3. Sealing the opening;
4). 4. Heat-shrink the sealed bag at 80 ° C. to 200 ° C., and Cooling the heat-shrinked bag to 50 ° C. or lower,
The manufacturing method of the covering vacuum heat insulating material of Claim 1 containing this.   The method according to claim 6 or 7, wherein a length of two sides constituting the apex in at least a part of the bag to be cut is 70 mm or less.   The non-heat-shrinkable film is a monolayer or multilayer film selected from the group consisting of a polyvinyl chloride film, a polystyrene film, a polyethylene film, a polypropylene film, an ethylene vinyl alcohol resin film, and a polyolefin film. The method of any one of these.   The method according to any one of claims 6 to 9, wherein a shrinkage ratio of the unheat-shrinkable film is 10 to 80%. The tensile strength of the non-heat shrinkable film is a 70~1800kg / cm ^2, The method according to any one of claims 6-10.