JP2005297235A - Heat insulating packaging film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating packaging film excellent in a heat insulating effect and barrier properties wherein heat transfer by radiation of infrared rays and absorption of the infrared rays are suppressed at a minimum and heat insulating properties are prevented from being deteriorated in an adhesive layer sticking together an infrared ray reflective layer consisting of a metal foil such as an aluminum foil and a protective layer consisting of an infrared ray permeable plastic film, and the protective layer. <P>SOLUTION: The heat insulating packaging film successively laminated with at least the infrared ray reflective layer consisting of the metal foil and the protective layer consisting of the infrared ray permeable plastic film on one face of a substrate on the other face of which a sealant layer is provided, is characterized by that the adhesive layer sticking together the infrared ray reflective layer and the protective layer is formed in a pattern-like shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat insulating packaging film used for an exterior of a vacuum heat insulating panel used for a refrigerator or the like.

  In recent years, heat insulation has been improved in performance as part of energy saving. As an example, there is a heat insulating material (called a vacuum heat insulating panel) whose inside is reduced in pressure among heat insulating materials used in a refrigerator or the like. As an example of this heat insulating material, a sectional view thereof is shown in FIG. A vacuum insulating panel C is obtained by providing a sealant layer of the heat insulating film 30 having a sealant layer formed on one side on the inner surface, filling the heat insulating core material 31 as a containing material for containing the heat insulating core material, and vacuum packaging. As the heat insulating core material, a synthetic resin foam such as rigid urethane foam, a molded body obtained by molding a powder such as silica or pearlite into a certain shape, a calcium silicate molded body, or the like is used.

  Among these, the characteristics required for the heat insulating film 30 include low permeation of air and moisture, and low heat transfer coefficient. Therefore, conventionally, a heat insulating packaging film having a structure as shown in FIG. 11 has been used. In this conventional heat insulating film D, for example, a heat fusion layer 43 made of high-density polyethylene is bonded to a gas barrier layer made of a polyethylene terephthalate (PET) film 41 on which an aluminum film 42 is deposited by using an adhesive 44. This gas barrier layer prevents the permeation of gas into the heat insulating material, thereby preventing the heat insulation from deteriorating. Moreover, since the film thickness of the aluminum film 42 is as thin as about 0.5 μm, heat leak along the aluminum film 42 is small and high heat insulating performance is obtained.

  In such a conventional heat insulating film, when the infrared reflection characteristic of the PET surface of the PET film 41 on which the aluminum film 42 is deposited is measured, the reflectance at a wavelength of 2 to 30 μm is extremely low at about 10%. This is because infrared rays are irregularly reflected on the surface of the aluminum film 42 because the surface roughness of the aluminum film 42 is large. Therefore, when the conventional heat insulating film is irradiated with infrared rays, the temperature of the PET film 41 is increased by the energy of the infrared rays while the infrared rays are irregularly reflected on the surface of the aluminum film 42, and the heat is transmitted through the aluminum film 42. As a result, heat leaked and the heat insulation was impaired.

  Therefore, instead of using an aluminum vapor-deposited film, as shown in FIG. 12, an adhesive 44 is used for the PET film 41, and the surface in contact with the PET film is polished to have a glossy surface with a surface gloss rate of 70% or more. The thing which adhered the foil 45 is proposed. However, when the infrared reflection characteristics of the heat insulating film on the PET surface were measured, the reflectance was as low as 10% or less in several wavelength regions centering on the wavelength region of 6 to 10 μm. This is considered that the PET film has absorbed infrared rays. That is, in the heat insulating film E, the effect of increasing the surface gloss rate of the aluminum foil 45 is not sufficiently exhibited due to the absorption of infrared rays by the PET film 41.

  Therefore, in order to solve the above problems, the absorption of infrared rays by the plastic film used as a protective layer provided on the surface of the heat insulating film is made as small as possible to minimize the radiant heat absorption by the infrared rays and at the same time maintain the gas barrier property. In order to do so, an infrared transmitting material is used as the protective layer, a metal foil is used as the infrared reflective layer, and the heat-sealing layer, the protective layer, and the infrared reflective layer are bonded with an adhesive. An integrated gas barrier layer has been proposed.

  However, even in the above heat insulating film, even if an infrared transmitting substance is used as the protective layer and a metal foil is used as the infrared reflecting layer, a urethane adhesive that is generally used as an adhesive for laminating the protective layer and the metal foil. In addition, since epoxy adhesives and ether adhesives absorb infrared rays, there is still a problem that the heat insulating effect is lowered by absorbing infrared rays with an adhesive layer made of these adhesives.

  The present invention has been made to solve the above-described problems, and is an adhesive layer that adheres an infrared reflecting layer made of a metal foil such as an aluminum foil and a protective layer made of an infrared transmissive plastic film to each other. Another object of the present invention is to provide a heat-insulating packaging film excellent in heat-insulating effect and barrier property, which prevents deterioration of heat-insulating property by minimizing infrared heat radiation and infrared absorption in the protective layer.

To achieve the above objectives, ie
The invention according to claim 1
On the other surface of the base material provided with a sealant layer on one side, an insulating packaging film in which at least an infrared reflective layer made of a metal foil and a protective layer made of an infrared transparent plastic film are sequentially laminated, The heat insulating packaging film is characterized in that an adhesive layer for bonding the infrared reflective layer and the protective layer to each other is formed in a pattern.

The invention according to claim 2
2. The heat insulating packaging film according to claim 1, wherein the area of the patterned adhesive layer is 5 to 80% of the substrate.

The invention according to claim 3
3. The heat insulating packaging film according to claim 1, wherein a thickness of the patterned adhesive layer is in a range of 0.1 to 6 μm.

The invention according to claim 4
The heat insulating packaging film according to any one of claims 1 to 3, wherein the metal foil is an aluminum foil having a surface gloss rate of 70% or more.

The invention according to claim 5
5. The heat insulating packaging film according to claim 1, wherein the aluminum foil has a thickness of 10 μm or more and 30 μm or less.

The invention according to claim 6
The heat insulating property according to any one of claims 1 to 5, wherein an adhesive layer for adhering the base material and the aluminum foil and the base material and the sealant layer to each other is formed in a solid form. It is a packaging film.

<Action>
In the present invention, an infrared ray transmitting plastic film is used for the protective layer, a metal foil is used for the infrared reflecting layer, and an adhesive layer for adhering the protective layer and the infrared reflecting layer is formed in a pattern. The thickness of the adhesive layer is in the range of 0.1 to 6 μm, and the area of the patterned adhesive layer is 5 to 80% of the base material, thereby reducing the absorption of infrared rays in the adhesive layer. And high infrared reflectance can be obtained. In addition, when an aluminum foil is used as the metal foil and the surface gloss rate is 70% or more and the aluminum foil has an appropriate thickness, a high infrared reflectance can be obtained. Moreover, when an aluminum foil as a metal foil functions as an advanced gas barrier layer, gas permeation can be prevented when used as an exterior material of a vacuum heat insulating panel.

  As described above, by using an infrared transparent plastic film as the protective layer, most of the infrared rays incident from the surface of the heat insulating packaging film pass through the protective layer and reach the infrared reflective layer surface, and the aluminum foil surface After being reflected by the film, it is transmitted through the protective layer and the adhesive layer again and is emitted to the outside from the film surface, so that the infrared reflection characteristics are improved. Therefore, it is possible to prevent deterioration of heat insulation properties due to radiation heat transfer and infrared absorption. In addition, if an aluminum foil having a high surface gloss rate is used as the infrared reflective layer, a high infrared reflectivity on the surface of the aluminum foil can be obtained, so that a high infrared reflectivity can be obtained over almost the entire infrared wavelength band. Further, the heat insulating property is further improved.

  Moreover, by using the heat insulating packaging film of the present invention as an exterior material of a vacuum heat insulating panel used for a refrigerator or the like, it is possible to provide a vacuum heat insulating panel having a high heat insulating property and a high gas barrier property.

  Hereinafter, a preferred embodiment of the heat insulating packaging film of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the configuration of the heat insulating packaging film of the present invention. As shown in FIG. 1, a heat-insulating packaging film A as an example of the present invention includes a second insulating layer 13 provided with a sealant layer 13 on one side through a third adhesive layer 16 on the other side. An infrared reflecting layer 11 made of a metal foil such as an aluminum foil is laminated through two adhesive layers 15, and an infrared ray is further formed on the infrared reflecting layer 11 made of the metal foil via a first adhesive layer 14. A heat-insulating packaging film in which a protective layer 10 made of a transparent plastic film is sequentially laminated, and an adhesive layer 14 for bonding the infrared reflective layer 11 and the protective layer 10 to each other is formed in a pattern. The third adhesive layer 16 and the second adhesive layer 15 for adhering the material 12 and the sealant layer 13 and the base material 12 and the infrared reflecting layer 11 made of metal foil are formed in a solid shape (entire surface). Yes.

  The base material 12 used in the present invention is a plastic material, and is not particularly limited. For example, a polyester film such as polyethylene terephthalate (PET) and polyethylene terephthalate copolymer polyester film or polyethylene naphthalate (PEN) is used. Polyolefin films such as polyethylene film, polypropylene film, ethylene-propylene copolymer film, polystyrene film, nylon 66 film, nylon 6 film, polyamide film such as metaxylidenediamine copolymer polyamide film, polycarbonate film, polyacrylonitrile film , Polyimide film, polyamide-imide film, polyvinyl alcohol film, ethylene-vinyl alcohol copolymer film Examples thereof include a film, a polyphenylene film, a polysulfone film, and a polyphenylene sulfide film. These may be stretched or unstretched as long as they have mechanical strength and dimensional stability. In particular, a polyethylene terephthalate (PET) film arbitrarily stretched in the biaxial direction from the viewpoint of heat resistance or the like is preferably used. Various known additives and stabilizers can also be added to the base material. Examples thereof include an antistatic agent, an ultraviolet ray preventing agent, a plasticizer, and a lubricant. In addition, in order to improve the adhesion when laminating each other layer on this substrate, corona treatment, low temperature plasma treatment, ion bombardment treatment, chemical treatment, solvent treatment, etc., with the laminated surface side of the substrate as a pretreatment Either treatment may be performed.

The thickness of the substrate 12 is not particularly limited, and a film obtained by laminating films having different properties other than a single film can be used in consideration of suitability as a packaging material. In consideration of workability in forming other layers, the range of 3 to 200 μm is preferable for practical use, and 6 to 30 μm is particularly preferable.

  As the metal foil used as the infrared reflective layer 11 in the present invention, an aluminum foil is preferably used. Since the aluminum foil has a dense structure, the vacuum degree of the vacuum heat insulating panel can be maintained for a long time due to high gas barrier properties. Further, since it exhibits high infrared reflection characteristics, it has been frequently used for preventing heat conduction due to radiant heat transfer.

  As the aluminum foil, foils having various thicknesses from 7 μm to 100 μm are generally produced. The thinner the aluminum foil is, the easier it is to make a pinhole, and the pinholeless aluminum foil has a thickness of 15 μm or more. However, as the thickness increases, the heat leak through the aluminum increases, so the film thickness needs to be determined by comparing the magnitude of the thermal conductivity and the change in vacuum over time. In addition, if the film thickness exceeds 20 μm, the rigidity of the aluminum foil increases, the laminate film springs back during heat fusion, the fusion strength decreases, and the laminate film is wrinkled, resulting in deterioration of vacuum retention. The thickness of the aluminum foil is preferably 20 μm or less.

  The protective film constituting the protective layer 10 used in the present invention is not particularly limited as long as it is an infrared transparent plastic film. For example, a polyethylene terephthalate (PET) film, a high density polyethylene film, a methylpentene polymer film, etc. can be used. In particular, a methylpentene polymer film is preferable.

  Although the thickness of the protective layer 10 which consists of a protective film is based also on the raw material to be used, the range of 3-30 micrometers is preferable. If the thickness is less than 3 μm, it is difficult to bond the layers together, and if it is thicker than 30 μm, the heat ray absorption by infrared rays increases, which is not preferable from an economical viewpoint.

  The sealant layer 13 used in the present invention may be any material that can be melted by heat and fused to each other. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density Polyethylene, cyclic polyolefin, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer Acid-modified polyolefins obtained by modifying polyolefin resins such as methylpentene polymer, polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, etc. Resin, polyvinyl acetate resin, polyester Resin, polystyrene resin, fluorine resin, one or resin comprising more resins other like can be used. In the present invention, when two layers of the thermoplastic resin layer are formed using the resin as described above, it can be formed by combining the same kind of resins or different kinds of resins. For example, it may be formed using the same kind of polyethylene resin, or different kinds of polyethylene resin and ethylene-vinyl acetate copolymer or polyethylene resin and ethylene-methacrylic acid copolymer are used. It can also be formed.

As an adhesive used for the first, second, and third adhesive layers 14, 15, and 16 for laminating the respective base materials constituting the heat-insulating packaging film of the present invention, the adhesive for laminating with an adhesive for laminating is used. It can be carried out by a dry lamination method or the like that is laminated through an adhesive layer. In the above, as the laminating adhesive, for example, one-pack or two-pack curable or non-cured vinyl, (meth) acrylic, polyamide, polyester, polyether, polyurethane, etc. Laminate adhesives such as solvent-type, epoxy-type, rubber-type, and other solvent-type, aqueous-type, and emulsion-type can be used. In the present invention, for example, an adhesion promoter such as a silane coupling agent can be arbitrarily added to the laminating adhesive.

  In the present invention, the first adhesive layer 14 for bonding the infrared reflective layer 11 made of a metal foil such as an aluminum foil and the protective layer 10 to each other using the above adhesive is formed in a pattern. As a method for forming a pattern, a gravure coating machine using the above adhesive, a coating machine using a rubber plate via an anilox roller, or a coating machine using a rotary screen, etc. The first adhesive layer 14 can be formed in a pattern by a known coating method used. In the case of the patterned first adhesive layer 14, the thickness of the adhesive layer 14 is desirably in the range of 0.1 to 6 μm.

  It does not specifically limit as a pattern shape, For example, a unit shape as shown in FIGS. 2-7 can be illustrated. It is effective to combine not only one type of unit pattern but also two or more types of unit patterns.

  The area of the pattern is appropriately selected according to the required adhesive strength within the range of 5 to 80% with respect to the substrate and the type of adhesive used.

  Further, the third adhesive layer 16 and the second adhesive layer 15 for adhering the base material 12 and the sealant layer 13 and the base material 12 and the infrared reflecting layer 11 made of metal foil to each other are solid (overall). It may be formed.

Examples of a method for forming a solid shape (entire surface) using the laminating adhesive described above include, for example, a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, and a river slot. It can be applied by a method such as a coat method, a fountain method, a transfer roll coat method, or the like, and the coating amount is preferably about 0.1 to 10 g / m ² (dry state). 1 to 5 g / m ² (dry state) is desirable.

  An example of the vacuum heat insulation panel which used the heat insulation packaging film of the present invention obtained above as an exterior material of a vacuum heat insulation panel is explained.

  As shown in FIG. 8, the sealant layer of the heat-insulating packaging film A of the present invention having a sealant layer formed on one side is provided on the inner surface, and the heat-insulating core material b is filled as a housing material for housing the heat-insulating core material, and vacuum packaging is performed. By doing so, the vacuum heat insulation panel B is obtained. As the heat insulating core material, a synthetic resin foam, a molded body obtained by molding a powder such as silica or pearlite into a certain shape, a calcium silicate molded body, or the like is used.

  The thickness of the heat-insulating packaging film as the exterior material is set in consideration of vacuum maintenance performance, mechanical strength, deformability at the time of pressure compression, and usually about 50 to 150 μm. The heat-insulating packaging film as the exterior material may be processed in a form that can easily accommodate the synthetic resin foam as a vacuum heat-insulating core material, such as a bag shape or a container shape, or a flat sheet shape. It is prepared as it is, and when the synthetic resin foam is accommodated, the synthetic resin foam may be wrapped and used.

As the vacuum heat-insulating core material, an open-cell foam that is easy to evacuate the internal space of the synthetic resin foam and is excellent in heat insulation is preferable. What has the shape maintenance property which a bubble does not collapse even if an internal space is evacuated is preferable. Specifically, open-celled rigid polyurethane foam is a preferred material. The density of the synthetic resin foam is preferably about 40 to 100 kg / m ³ , and the average cell diameter is preferably about 100 μm or less. The synthetic resin foam can be used after being previously foam-molded into a block shape or a plate shape and cut into a size and shape that can be accommodated in a heat insulating packaging film as an exterior material.

  The shape of the synthetic resin foam may be a rectangular shape as a vacuum heat insulating material, a disc shape or other irregular shape, or a partially uneven shape, depending on the application. The size of the synthetic resin foam is preferably about 15 to 70 mm. The thickness of the synthetic resin foam is set to a thickness that takes into account the reduction due to pressure compression with respect to the thickness of the synthetic resin foam in the vacuum heat insulating material that is finally required.

  The synthetic resin foam is accommodated in a heat-insulating packaging film as an exterior material, the interior space is evacuated by degassing, and the flexible container is sealed in the same manner as a normal vacuum heat insulating material manufacturing technique. . Specifically, the synthetic resin foam is covered with a heat-insulating packaging film as an exterior material except for a portion serving as a vacuum suction port, and air in the internal space of the heat-insulating packaging film as an exterior material is discharged from the vacuum suction port. . When the internal space of the heat insulating packaging film as the exterior material is degassed, the internal space is narrowed until the heat insulating packaging film as the exterior material is in close contact with the outer shape of the synthetic resin foam, and then the outer material is applied to the synthetic resin foam. In the state where the heat insulating packaging film is in close contact, the air inside the synthetic resin foam is exhausted to be in a vacuum state. When a predetermined degree of vacuum is achieved, the vacuum suction port is sealed and the heat insulating packaging film as the exterior material is sealed.

  The degree of vacuum in the internal space varies depending on the required heat insulating performance, but is usually set to 0.1 to 1.0 Torr. For sealing the heat-insulating packaging film as the exterior material, adhesion by thermal fusion of a sealant layer provided on the heat-insulating packaging film as the exterior material is employed.

A heat insulating packaging film as an exterior material containing the synthetic resin foam is pressurized and compressed. As the pressurizing device, a normal press device can be used. The pressurizing apparatus can be provided with a pressurizing mold corresponding to the shape of the heat insulating packaging film as the exterior material. The pressurizing pressure is preferably about 5 kg / cm ² . Heating can be performed simultaneously with pressurization. The synthetic resin foam accommodated in the heat insulating packaging film as the exterior material is mainly compressed in the thickness direction by pressurization. It is necessary to compress the synthetic resin foam until permanent deformation occurs. Since the internal space of the heat insulating packaging film as the exterior material is in a vacuum state substantially free of air, it is easily compressed in accordance with the deformation of the synthetic resin foam even when sealed.

  Examples of the present invention will be described below.

<Film material>
・ Polyethylene terephthalate (PET) film [“E5200” manufactured by Toyobo Co., Ltd.]
・ Aluminum foil (AL) film [Showa Denko Co., Ltd.]
・ Polyethylene naphthalate (PEN) film [manufactured by Teijin DuPont Film Teflex Co., Ltd.]
Unstretched polypropylene (CPP) film [Toyobo Co., Ltd. “P1146”]
<Adhesive>
・ Polyurethane-based dry laminate adhesive (A310 / A10 = 10/1 mixed with "A310" and "A10" manufactured by Mitsui Takeda Chemical Co., Ltd.)
Using the above film material and adhesive, a heat insulating packaging film of the present invention having the following constitution was prepared. In addition, the pattern shape shown in FIG. 3 was applied to the 1st adhesive bond layer, the application | coating thickness of the adhesive agent was 3 micrometers, and the adhesive agent area area ratio with respect to a base material was 20%. The second and third adhesive layers were formed on the entire surface in a solid form.

Protective layer (PET12) / first adhesive layer (pattern) / infrared reflective layer (AL20) / second
Adhesive layer (solid) / base material (PEN12) / third adhesive layer (solid) / sealant layer (CPP60) [The numerical value of the base material in the above () represents the thickness (μm) of the base material. ]
In addition,

  In Example 1, the same pattern as in Example 1 was applied except that the shape pattern shown in FIG. 4 was applied as the shape pattern of the first adhesive layer, and the adhesive area ratio relative to the base material was 45%. An insulative packaging film of the invention was made.

  In order to compare the performance with Examples 1 and 2 of the present invention, the same procedure as in Example 1 was conducted except that the first adhesive layer was solidly applied and the adhesive coverage area ratio with respect to the substrate was 100%. A heat insulating packaging film was prepared.

  In order to compare the performance with Examples 1 and 2 of the present invention, the first adhesive layer was solid coated with an adhesive coating thickness of 1 μm, and the adhesive coverage area ratio to the base material was 100%. Produced a heat-insulating packaging film in the same manner as in Example 1.

  The thermal insulation packaging film obtained above was measured for the infrared reflectance and the laminate strength between the adhesive layers that adhere the protective layer and the infrared reflective layer to each other based on the method described below. The results are shown in Table 1.

<Measurement method of infrared reflectance>
The infrared reflectance was measured by the following procedure using an infrared measuring device (JIR-5500 FT-IR manufactured by JEOL Ltd.). An outline of the infrared measuring apparatus is shown in FIG. (A) is a top view, (b) is a side view.

  1) Set the sample 20 on the sample stage 21 (heating unit), attach temperature sensors 24 and 23 to the sample surface and the stage surface, and adjust the temperature so that the sample surface becomes 150 ± 1 ° C.

  2) After the temperature has stabilized, first perform radiation measurement on a standard black body, and then perform radiation measurement on the sample.

  3) Obtain the emissivity, integral emissivity, and radiance of the sample from the standard blackbody calibration curve.

  The measurement conditions are shown below.

Infrared radiation unit: JEOL IR-IRR200
Standard black body temperature: 40 ° C, 160 ° C
・ Resolution: 16cm- ¹
・ Scan: 200 times ・ Measurement wavelength region: 2.5 to 25 μm
・ Sample aperture: 10mmφ
<Measurement method of laminate strength>
The first patterned adhesive layer portion was cut to a width of 15 mm, and the laminate strength of the first adhesive layer was measured under the condition of a tensile speed of 300 mm / min. The laminate strength value was expressed as an average value of the maximum value and the minimum value.

  Next, using the heat insulating packaging film obtained above as an exterior material, a vacuum heat insulation core material (made of glass wool) is housed and sealed to create a vacuum heat insulation panel of size 300 × 150 × 150 cm. The outside temperature was maintained at 100 ° C., and the temperature difference between the inside and outside of the heat insulating material of the panel after 1 hour and the presence or absence of breakage (film turning) by the gelbot tester shown below were evaluated. The results are shown in Table 1.

<Gelbo flex tester test method>
In accordance with ASTM F392-93 (1999), a tester industry Co., Ltd. gelboflex tester was used and tested under conditions of 20 times at 20 ° C. and 60% RH under 500 conditions. The peeling of was observed visually. The case where peeling was observed was expressed as “film turning”.

表１には、各実施例についての赤外放射率、断熱材内温度差、ラミネート強度、フィルムめくれ発生袋数、および総合評価を記してある。

Table 1 shows the infrared emissivity, the temperature difference in the heat insulating material, the laminate strength, the number of film-turned bags, and the overall evaluation for each example.

  From Table 1, the heat insulating packaging films of the present invention obtained in Examples 1 and 2 have excellent heat insulating effects as the heat insulating packaging films obtained in Examples 3 and 4 as comparative examples of the present invention. This is because an infrared transparent plastic film is used for the protective layer, a metal foil is used for the infrared reflective layer, and an adhesive layer for bonding the protective layer and the infrared reflective layer to each other is formed in a pattern, When the thickness of the adhesive layer is in the range of 0.1 to 6 μm and the area of the patterned adhesive layer is 5 to 80% of the base material, the absorption of infrared rays in the adhesive layer is reduced and high. Infrared emissivity was obtained. Moreover, as a result of comprehensive evaluation, it was confirmed that the heat insulating packaging films of the present invention obtained in Examples 1 and 2 were sufficiently practical as exterior materials such as vacuum heat insulating panels.

It is sectional drawing which shows an example of a structure of the heat insulation packaging film of this invention. It is the pattern shape as one Example of the adhesive bond layer which adhere | attaches the protective layer and infrared reflection layer which comprise the heat insulation packaging film of this invention mutually. It is the pattern shape as one Example of the adhesive bond layer which adhere | attaches the protective layer and infrared reflection layer which comprise the heat insulation packaging film of this invention mutually. It is the pattern shape as one Example of the adhesive bond layer which adhere | attaches the protective layer and infrared reflection layer which comprise the heat insulation packaging film of this invention mutually. It is the pattern shape as one Example of the adhesive bond layer which adhere | attaches the protective layer and infrared reflection layer which comprise the heat insulation packaging film of this invention mutually. It is the pattern shape as one Example of the adhesive bond layer which adhere | attaches the protective layer and infrared reflection layer which comprise the heat insulation packaging film of this invention mutually. It is the pattern shape as one Example of the adhesive bond layer which adhere | attaches the protective layer and infrared reflection layer which comprise the heat insulation packaging film of this invention mutually. It is sectional drawing which shows an example of the vacuum heat insulation panel which uses the heat insulation packaging film of this invention as an exterior material. It is explanatory drawing explaining the infrared measuring device which measures the infrared emissivity of a heat insulation packaging film. (A) is a top view. (B) is a side view. It is sectional drawing which shows an example of the conventional vacuum heat insulation panel. It is sectional drawing which shows an example of the heat insulation laminate film used for the exterior material of the conventional vacuum heat insulation panel. It is sectional drawing which shows the other example of the heat insulation laminate film used for the exterior | packing material of the conventional vacuum heat insulation panel.

Explanation of symbols

10 ... Protective layer 11, 45 ... Metal foil layer (aluminum foil layer)
DESCRIPTION OF SYMBOLS 12 ... Base material layer 13, 43 ... Sealant layer 14 ... 1st adhesive layer 15 ... 2nd adhesive layer 16 ... 3rd adhesive layer 20 ... Sample DESCRIPTION OF SYMBOLS 21 ... Heating stage 22 ... Sample fixing tool and screw 23 ... Heating stage temperature sensor 24 ... Sample surface temperature sensor 30 ... Exterior material (heat insulating film)
DESCRIPTION OF SYMBOLS 31 ... Core material 41 ... Polyethylene terephthalate film (PET) layer 42 ... Aluminum vapor deposition film 44 ... Adhesive layer A ... Heat insulation packaging film B, C ... Vacuum insulation panel D, E ... Thermal insulation laminate film

Claims (6)

  A heat-insulating packaging film in which a far-infrared reflective layer made of at least a metal foil and a protective layer made of an infrared-transmitting plastic film are sequentially laminated on the other surface of the base material provided with a sealant layer on one side, An insulating packaging film, wherein an adhesive layer for bonding the far-infrared reflective layer and the protective layer to each other is formed in a pattern.   The heat insulating packaging film according to claim 1, wherein the area of the patterned adhesive layer is 5 to 80% of the substrate.   The heat insulating packaging film according to claim 1 or 2, wherein the thickness of the patterned adhesive layer is in the range of 0.1 to 6 µm.   The heat insulating packaging film according to any one of claims 1 to 3, wherein the metal foil is an aluminum foil having a surface gloss rate of 70% or more.   The heat-insulating packaging film according to any one of claims 1 to 4, wherein the aluminum foil has a thickness of 10 µm to 300 µm.   The heat insulating property according to any one of claims 1 to 5, wherein an adhesive layer for adhering the base material and the aluminum foil and the base material and the sealant layer to each other is formed in a solid form. Packaging film.

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