JP2006021429A - Vacuum heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material which is high in durability in relation to a pinhole by thrusting. <P>SOLUTION: A laminated film 9, obtained by laminating a heat seal layer 5, a gas-barrier layer 6, a second protective layer 7 of a polyethylene or polypropylene film layer with a Young's modulus according to JIS K 7127 of 200 MPa or below, and a first protective layer 8 in turn from the inside through, for example, a urethane type adhesive layer about 3 μm in thickness arranged between the layers, is used as the coating material 10 of the vacuum heat insulating material 1. The occurrence of the pinhole by a thrust with the foreign substance of a core material 3 can be prevented by the excellent flexibility and impact resistance of the polyethylene or polypropylene film layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminate film, a package, and a vacuum heat insulating material.

Conventionally, the jacket material of this type of vacuum heat insulating material has been composed of a plastic laminate film having a metal foil or a vapor-deposited film, and attempts to prevent foreign objects from piercing by improving the piercing strength of the plastic layer. Has been made. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 9-317986

  When vacuum insulation material is manufactured, the chamber is evacuated and the opening is heat-sealed. After the chamber is opened to the atmosphere, the atmosphere is introduced into the chamber, which becomes a shock wave and is added to the outer cover material of the vacuum insulation material. . Glass fibers having an average diameter of 10 μm or less are used as the core material of the vacuum heat insulating material. However, when a foreign object is produced in the glass fiber, this is applied to the jacket material by the shock wave. It pierced from the inside, pinholes were generated in the vacuum heat insulating material, and there was a problem that the vacuum state of the vacuum heat insulating material could not be maintained.

  An object of this invention is to provide the vacuum heat insulating material with high durability with respect to the pinhole by piercing in view of the said subject.

  In order to achieve the above object, the present invention uses a laminate film having a layer made of a polyethylene film or a polypropylene film having a Young's modulus in JISK7127 of 200 MPa or less.

  Thereby, as for the jacket material using this laminate film, a part of the laminate film constituting the jacket material has excellent flexibility and excellent impact resistance. In other words, the vacuum heat insulating material using the outer cover material is excellent in flexibility against the piercing of the foreign material from the core material side. It becomes difficult to pierce. Moreover, when it is excellent in impact resistance, the sticking by a foreign material can be suppressed when the atmosphere is introduced into the vacuum chamber. With these two effects, the jacket material can prevent the occurrence of pinholes.

  According to the present invention, durability against pinholes caused by piercing can be increased.

  The invention described in claim 1 is a laminate film formed by laminating with an adhesive in the order of a heat seal layer, a gas barrier layer, a polyethylene film layer or polypropylene film layer having a Young's modulus of 200 MPa or less in JISK7127, and a protective layer. .

  Since this laminate film has a polyethylene film layer or a polypropylene film layer having a Young's modulus of JISK7127 of 200 MPa or less, against pinhole factors such as piercing from the heat seal layer side or the protective layer side, Since the polyethylene film layer or the polypropylene film layer has excellent flexibility and impact resistance, the generation of pinholes can be suppressed.

  The invention according to claim 2 is a laminate film comprising a heat seal layer, a gas barrier layer, a polyethylene film layer having a Young's modulus in JISK7127 of 200 MPa or less or a polypropylene film layer, and a protective layer, which are laminated with an adhesive. It is a package characterized by heat-sealing heat-sealing layers and filling an object inside.

  In this package, since the polyethylene film layer or the polypropylene film layer has excellent flexibility and impact resistance against a pinhole factor from inside or outside the package, Generation can be suppressed.

  The invention according to claim 3 is a laminate film formed by laminating a heat seal layer, a gas barrier layer, a polyethylene film layer or a polypropylene film layer having a Young's modulus of 200 MPa or less in JISK7127, and a protective layer in this order. It is a vacuum heat insulating material formed by heat-sealing heat seal layers and filling a core material under reduced pressure.

  Generally, a vacuum heat insulating material is evacuated in a vacuum chamber, and after heat-sealing the opening of the outer cover material of the vacuum heat insulating material, when the vacuum chamber is opened to the atmosphere, the introduced atmosphere becomes a shock wave, and the outer cover material A shock is applied to the outer cover material, and the foreign matter contained in the glass fiber used as the core material pierces the jacket material from the inside due to the shock.

  However, the vacuum heat insulating material of the present invention has a polyethylene film or a polypropylene film excellent in flexibility and impact resistance having a Young's modulus of 200 MPa or less in JISK7127, and the jacket material is in the above situation. Because it has flexibility, the jacket material is easily deformed, and foreign matter contained in the glass fiber is difficult to pierce and has high impact strength. The occurrence of pinholes can also be suppressed against piercing.

  In addition to the above effects, the polyethylene film or polypropylene film having a Young's modulus of 200 MPa or less in JISK7127 is located on the atmosphere side with respect to the gas barrier layer, and thus the polyethylene film or polypropylene film may have poor gas barrier properties. Since air does not enter the inside of the vacuum heat insulating material via, a change with time of the thermal conductivity of the vacuum heat insulating material can be suppressed to a small value.

  The invention according to claim 4 is the vacuum heat insulating material according to claim 3, wherein a nylon film is used for the protective layer, and the pinhole cannot be suppressed by the polyethylene film or the polypropylene film. However, since the next protective layer has a nylon film with good pinhole resistance, the nylon film can further suppress the generation of pinholes and further improve the pinhole resistance.

  Invention of Claim 5 is a vacuum heat insulating material of Claim 3 which used the polyethylene terephthalate film for the said protective layer, In addition to the effect of the invention of Claim 3, polyethylene terephthalate Since the film is excellent in pinhole resistance, the generation of pinholes can be further suppressed with a polyethylene terephthalate film.

  In addition, since polyethylene terephthalate is excellent in friction resistance, when the polyethylene terephthalate film is the outermost layer, the conveyor and the vacuum heat insulating material in the vacuum heat insulating material and vacuum heat insulating material manufacturing line or the vacuum heat insulating material applying device manufacturing line, etc. Even if rubbed, the generation of pinholes can be suppressed, and the polyethylene terephthalate film has a low hygroscopic property, so in the evacuation process in the production of vacuum heat insulating material, the evacuation time of the polyethylene terephthalate film can be prolonged. Can be suppressed.

  The invention according to claim 6 is a laminate film obtained by laminating with an adhesive in the order of a heat seal layer, a polyethylene terephthalate film layer, a gas barrier layer, a polyethylene film layer having a Young's modulus of 200 MPa or less in JISK7127, or a polypropylene film layer. These heat seal layers are heat-welded with each other, and a vacuum heat insulating material is formed by filling the core material under reduced pressure.

  Thereby, in addition to the effect of the invention of the third aspect, the polyethylene terephthalate is arranged on the core material side of the gas barrier layer, so that the pinhole resistance of the vacuum heat insulating material can be further improved. In addition, the gas barrier property of polyethylene terephthalate film is much better than that of heat sealing film, so the influence of gas intrusion from polyethylene terephthalate film into vacuum insulation is almost ignored. can do.

The invention according to claim 7 is a vacuum heat insulating material according to any one of claims 1 to 6, wherein a low-density polyethylene film having a heat seal layer density of 0.930 g / cm ³ or more is used. In addition to the effect of improving the resistance to pinholes, by using a low density polyethylene film having a density of 0.930 g / cm ³ or more, gas intrusion from the heat seal layer can be suppressed, and a high density polyethylene film, Compared to unstretched polypropylene film, low-density polyethylene film has more flexibility, so that the occurrence of pinholes in the vacuum heat insulating material can be suppressed.

  The invention according to claim 8 is a laminate film obtained by laminating with an adhesive in the order of a heat seal layer, a gas barrier layer, and a protective layer using a polyethylene film or a polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127. is there.

  By using the polyethylene film or the polypropylene film for the heat seal layer, the polyethylene film or the polypropylene film has excellent flexibility and impact resistance, and this first comes into contact with a substance that causes pinholes. In addition to preventing the generation, a protective layer having good pinhole resistance is used next to the next gas barrier layer, so that the pinhole resistance of the laminate film is improved.

  The invention according to claim 9 is a laminate film formed by laminating with an adhesive in the order of a heat seal layer, a gas barrier layer, and a protective layer using a polyethylene film or polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127. It is a package characterized by heat-sealing the heat seal layers and filling an object inside.

  By using the polyethylene film or the polypropylene film for the heat seal layer, the polyethylene film or the polypropylene film has excellent flexibility and impact resistance, and this first comes into contact with a substance that causes pinholes. Next to the gas barrier layer, a protective layer having good pinhole resistance is used.

  Even if puncture to the laminate film occurs due to the substance filled in the package, the heat seal layer uses a polyethylene film or a polypropylene film whose Young's modulus in JISK7127 is 200 MPa or less. The substance first comes into contact with the polyethylene film or the polypropylene film, but due to its flexibility and impact resistance, the generation of pinholes in the package can be greatly suppressed.

  The invention according to claim 10 is a laminate film formed by laminating with an adhesive in the order of a heat seal layer, a gas barrier layer, and a protective layer using a polyethylene film or a polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127. It is a vacuum heat insulating material formed by thermally welding the heat seal layers and filling a core material under reduced pressure.

  Generally, a vacuum insulation material is evacuated in a vacuum chamber, heat-sealed the opening of the outer cover material of the vacuum insulation material, and then opened to the atmosphere, the introduced atmosphere becomes a shock wave, and the outer cover material is impacted. In addition, the foreign matter contained in the glass fiber used as the core material is pierced from the inner side into the jacket material by the impact.

  However, since the vacuum heat insulating material of the present invention has a polyethylene film or a polypropylene film having excellent flexibility with a Young's modulus of 200 MPa or less in JISK7127, the jacket material is flexible in the above situation. Since the outer shell material is easily deformed and the foreign matter contained in the glass fiber is hard to pierce, this polyethylene film or polypropylene film also has a high impact strength as described above. The occurrence of pinholes can be suppressed even when the glass fiber foreign material is pierced by the impact.

  In addition, the polyethylene film or the polypropylene film has only one surface bonded to the other film, and is in direct contact with foreign matter when released to the atmosphere, so that it can come into contact with foreign matter in a more free shape. Significant improvements can be made to the occurrence of

  The invention according to claim 11 is the vacuum heat insulating material according to claim 10, wherein the laminate film cross section is coated with an ethylene polyvinyl alcohol copolymer or a polyacrylic acid resin. In addition to the effect of improving the pinhole resistance of the invention of the present invention, the coating of ethylene polyvinyl alcohol copolymer or polyacrylic acid resin has a large gas barrier property improving effect, and therefore the polyethylene film or polypropylene having poor gas barrier property. Even if a film is applied, the amount of gas intrusion from the end face of the vacuum heat insulating material can be greatly reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of the vacuum heat insulating material in the first embodiment. As shown in FIG. 1, the vacuum heat insulating material 1 is obtained by covering a core material 3 and a gas adsorbent 4 with a covering material 2 and sealing the inside of the covering material 2 under reduced pressure.

FIG. 2 shows a cross section of the jacket of the vacuum heat insulating material of the first embodiment. As shown in FIG. 2, a heat seal layer 5 having a thickness of about 50 μm made of a low density polyethylene film or polypropylene film having a density of 0.930 g / cm ³ or more, a thickness made of a metal foil or a plastic film having a melting point of 150 ° C. or more. A gas barrier comprising a base film having a thickness of about 15 μm or less, a plastic film having a vapor deposition layer of any one of metal, metal oxide, and silica, or a plastic film having a polyacrylic acid resin coating layer provided on the vapor deposition layer. A first protective layer comprising a second protective layer 7 made of a polyethylene film or a polypropylene film having a Young's modulus of 200 MPa or less and a thickness of about 50 μm, and a nylon film having a thickness of about 25 μm or less. Layer 8 is approximately 3 μm urethane between each layer The laminate film 9 formed by sequentially laminated via the adhesive layer, constituting the enveloping member 10.

  Here, the manufacturing method of a vacuum heat insulating material is demonstrated.

  The core material 3 is dried for a predetermined time in a constant temperature furnace. The core material 3 and the adsorbent 4 are inserted into a jacket material 10 which has been sealed on three sides in advance by heat welding, the jacket material 10 is installed in a vacuum chamber, and the inside of the jacket material 10 is decompressed to about 13 Pa. Then, the opening part of the jacket material 10 is sealed by heat welding. Thereafter, the atmosphere is introduced into the vacuum chamber, the atmospheric pressure is returned to the inside of the vacuum chamber, and the completed vacuum heat insulating material 1 is taken out.

  The operation of the vacuum heat insulating material 1 produced as described above will be described for pinhole resistance.

  When the vacuum heat insulating material 1 is manufactured, evacuation is performed in the vacuum chamber, and the opening of the jacket material 10 is heat-sealed, and then the vacuum chamber is opened to the atmosphere, the air is introduced into the chamber. The introduced atmosphere becomes a shock wave, and an impact is applied to the jacket material 10 of the vacuum heat insulating material 1. Glass fibers having an average diameter of 10 μm or less are used as the core material 3 of the vacuum heat insulating material 1, but foreign matters generated when the glass fibers are produced remain in the glass fibers, and foreign matters are removed by the shock waves. The phenomenon of piercing the workpiece from the inside occurs.

At this time, the outer cover material 10 has, in order from the inside, a heat seal layer 7 made of a low density polyethylene film having a density of 0.930 g / cm ³ or more and a thickness of about 50 μm, a metal foil having a thickness of about 6 μm, or a melting point. A base film made of a plastic film having a thickness of about 12 μm at 150 ° C. or more, a plastic film having a metal, metal oxide, or silica deposited layer, or a 1 μm polyacrylic resin layer on the deposited layer A gas barrier layer 6 made of a plastic film having a thickness, a second protective layer 7 made of a polyethylene film or a polypropylene film having a thickness of about 50 μm with a Young's modulus in JISK7127 of 200 MPa or less, and a second protective layer 7 made of nylon having a thickness of about 25 μm. 1 protective layer 8 is sequentially laminated between each layer via an adhesive layer of about 3 μm urethane. Since the laminated film 9 is used, the occurrence of pinholes in the outer cover material 10 can be suppressed even when the atmosphere in the vacuum chamber is released.

  That is, when the atmosphere is released, the jacket material 10 is struck against the core material 3 by the introduced atmosphere, but the jacket material 10 has a polyethylene film or a polypropylene film having excellent flexibility, In the above situation, the outer covering material 10 is easily deformed to some extent along the shape of the foreign matter, so that the foreign matter is difficult to pierce, the Young's modulus in JISK7127 is 200 MPa or less, and the impact strength in JISK7124 is 100 N · Since the polyethylene film or polypropylene film 7 of cm or more has high impact strength, it is possible to suppress the occurrence of pinholes due to foreign material piercing from the core material 3 side due to the impact when released to the atmosphere.

  As an example, the results of producing 30 vacuum heat insulating materials each using the core material 3 containing a large amount of the foreign matter and four kinds of jacket materials are shown below.

Example 1
From the core material side, a low density polyethylene film with a density of 0.930 g / cm ^{3 and} a thickness of about 50 μm, an aluminum foil with a thickness of about 6 μm, a low density polyethylene film with a Young's modulus of 430 MPa and a thickness of about 50 μm. A vacuum heat insulating material was produced using a four-layer outer covering material of a nylon film having a thickness of about 15 μm.

  Immediately after production and 7 days after production, the vacuum insulation of the vacuum heat insulating material was inspected, and it was confirmed that bag breakage due to 5 pinholes occurred after being left for 7 days. The impact strength of the low density polyethylene film was about 70 N · cm as measured by JISK7124.

(Example 2)
From the core side, a low density polyethylene film with a density of 0.930 g / cm ^{3 and} a thickness of about 50 μm, an aluminum foil with a thickness of about 6 μm, and a low density polyethylene film with a Young's modulus of JISK7127 of about 50 μm and a thickness of about 50 μm. A vacuum heat insulating material was produced using a four-layer outer covering material of a nylon film having a thickness of about 15 μm.

  Immediately after the production and 7 days after the production, the vacuum insulation of the vacuum heat insulating material was inspected, and it was confirmed that two pieces of bag breakage due to pinholes occurred after leaving for 7 days. The impact strength of the low density polyethylene film was about 80 N · cm as measured by JISK7124.

Example 3
From the core side, a low density polyethylene film having a density of 0.930 g / cm ^{3 and} a thickness of about 50 μm, an aluminum foil having a thickness of about 6 μm, and a low density polyethylene film having a Young's modulus of 140 MPa and a thickness of about 50 μm according to JISK7127. A vacuum heat insulating material was produced using a four-layer outer covering material of a nylon film having a thickness of about 15 μm.

  Immediately after the production and 7 days after the production, the vacuum insulation of the vacuum heat insulating material was inspected, and it was confirmed that there was no bag breakage due to pinholes after standing for 7 days. The impact strength of the low density polyethylene film was about 100 N · cm as measured by JISK7124.

Example 4
From the core material side, a low density polyethylene film with a density of 0.930 g / cm ^{3 and} a thickness of about 50 μm, an aluminum foil with a thickness of about 6 μm, and a low density polyethylene film with a Young's modulus of JIS K7127 of 110 MPa and a thickness of about 50 μm. A vacuum heat insulating material was produced using a four-layer outer covering material of a nylon film having a thickness of about 15 μm.

  Immediately after the production and 7 days after the production, the vacuum insulation of the vacuum heat insulating material was inspected, and it was confirmed that there was no bag breakage due to pinholes after standing for 7 days. The impact strength of the low density polyethylene film was about 200 N · cm as measured by JISK7124.

  Moreover, in a low density polyethylene film, since the softness | flexibility and impact resistance improve, so that the Young's modulus in JISK7127 becomes small, the pinhole resistance of the jacket material 10 will improve.

Moreover, since the heat seal layer 7 of the jacket material 2 uses a low density polyethylene film having a density of 0.930 g / cm ³ or more, the heat seal layer 7 is a high density polyethylene film, an unstretched polypropylene film. Compared to the above, since it has more flexibility, it is possible to suppress the occurrence of pinholes from the inside of the jacket material 10 by the core material 3 for the same reason as described above.

In addition, a low density polyethylene film having a density of 0.930 g / cm ³ or more has better gas barrier properties than a low density polyethylene film or polypropylene film having a Young's modulus of 200 MPa or less in JISK7127. There is no need for special handling for the layer cross section and heat seal width.

  Even when the jacket material 10 is used for a package other than the vacuum heat insulating material, it has excellent flexibility and resistance to the outside of the gas barrier 6 against pinhole factors such as piercing from inside or outside the package. Since the polyethylene film or polypropylene film layer having impact properties is laminated, the generation of pinholes in the package can be suppressed.

  In addition, although the bag shape of the jacket material 3 was explained in the three-side seal bag, there are four-side seal bags, gusset bags, three-side seal bags, pillow bags, center tape seal bags, etc., which are particularly specified. It is not a thing. Moreover, it does not specifically limit about the thickness of each film.

(Embodiment 2)
FIG. 3 shows a cross-sectional view of the jacket 12 of the vacuum heat insulating material 11 according to the second embodiment. In the present embodiment, a polyethylene terephthalate film is used for the first protective layer 13, and there is an approximately 3 μm urethane-based adhesive layer between the film layers of the outer covering material 12. Each film is laminated by the agent layer. In addition, the same code | symbol is attached | subjected about the same structure as Embodiment 1, and the detailed description is abbreviate | omitted.

  As described above, a polyethylene terephthalate film having a thickness of about 12 μm is used for the first protective layer 13 for the jacket 12 of the vacuum heat insulating material 11. This polyethylene terephthalate film has excellent friction resistance and excellent pinhole resistance compared to nylon film and polyethylene film as film properties. Since the first protective layer 13 is excellent in friction resistance, even if the vacuum heat insulating material 11 rubs against the conveyor or the like in the vacuum heat insulating material 11 and the vacuum heat insulating material 11 production line or the vacuum heat insulating material 11 application equipment production line, the friction is generated. The generation of pinholes due to can be suppressed. Furthermore, since the first protective layer 13 has a low hygroscopic property, it is possible to suppress the lengthening of the vacuuming time due to moisture absorption in the vacuuming step in the production of the vacuum heat insulating material 11.

  In addition, although the bag shape of the jacket material 3 was explained in the three-side seal bag, there are four-side seal bags, gusset bags, three-side seal bags, pillow bags, center tape seal bags, etc., which are particularly specified. It is not a thing. Moreover, it does not specifically limit about the thickness of each film.

(Embodiment 3)
FIG. 4 shows a cross section of the jacket 15 of the vacuum heat insulating material 14 according to the third embodiment. In the present embodiment, a polyethylene terephthalate film 17 having a thickness of about 12 μm is disposed on the side of the core 3 and adjacent to the gas barrier layer 16 with respect to the gas barrier layer 16.

Further, a polyethylene film having a density of about 0.930 g / cm ³ or more and a thickness of about 50 μm is used for the heat seal layer 17a, and the protective layer 18 adjacent to the outside of the gas barrier layer 16 has a Young's modulus according to JISK7127. Is a polyethylene film or a polypropylene film having a thickness of about 50 μm and a thickness of 200 MPa or less. There may or may not be a layer on the outer layer side of the protective layer 18.

  In addition, there is an adhesive layer of about 3 μm urethane or the like between each film layer of the jacket material 15, and each film is laminated by this adhesive layer. The same components as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The outer sheath material 15 of the vacuum heat insulating material 14 is a gas barrier layer 16 in which a polyethylene terephthalate film 17 is disposed on the core material 3 side and adjacent to the gas barrier layer 16. This is a configuration having a protective layer 13 made of a polyethylene film or a polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127.

  At this time, the pinhole resistance of the jacket material 14 is that the polyethylene naphthalate film 17 is formed between the heat seal layer 5 and the gas barrier layer 6 in contrast to the configuration described in the first embodiment. Since the polyethylene terephthalate film 17 having good pinhole resistance is provided up to the protective layer 13, the pinhole resistance of the vacuum heat insulating material 14 can be improved, and the gas barrier layer 16 can be pinned without penetrating the protective layer 13. Even if a hole is generated, since one extra polyethylene terephthalate film 17 is added from the core material 3, the diameter of the pinhole is reduced and the amount of air entering through the protective layer 13 is reduced.

Further, since the gas barrier property of the polyethylene terephthalate film 18 is very good as compared with the polyethylene film having a heat seal layer 18 density of 0.930 g / cm ³ or more, the vacuum heat insulating material 14 from the polyethylene terephthalate film 18 is used. The influence of gas intrusion into the inside can be almost ignored.

  In addition, although the bag shape of the jacket material 3 was explained in the three-side seal bag, there are four-side seal bags, gusset bags, three-side seal bags, pillow bags, center tape seal bags, etc., which are particularly specified. It is not a thing. Moreover, it does not specifically limit about the thickness of each film.

(Embodiment 4)
FIG. 5 shows a cross section of the jacket material 20 of the vacuum heat insulating material 19 according to the fourth embodiment. The jacket material 20 in the present embodiment uses a polyethylene film or a polypropylene film having a thickness of about 50 μm with a Young's modulus of JIS K7127 of 200 MPa or less as the heat seal layer 21, and a gas barrier adjacent to the outside of the heat seal layer 21. A plastic film having a metal film or a metal film or a base film made of a plastic film having a melting point of 150 ° C. or more and a thickness of about 15 μm or less, a metal film, a metal oxide, or a silica film, or a layer of Further, a nylon film is used for each of the second protective layer 23 and the first protective layer 24 adjacent to the outside of the gas barrier layer 22 using a plastic film having a polyacrylic acid resin coating layer thereon. Its thickness is about 25 μm or less.

  In addition, there is an approximately 3 μm urethane adhesive layer between the film layers of the jacket material 20, and the films are laminated by this adhesive layer. The detailed description of the same configuration as in the first to third embodiments is omitted.

  The heat seal layer 21 of the vacuum heat insulating material 19 is made of a polyethylene film or a polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127. However, since the jacket material 20 has a polyethylene film or a polypropylene film having excellent flexibility, the outer shell material 20 is easily deformed in the above situation, so that the foreign material of the core material 3 can be deformed. Since the polyethylene film or polypropylene film 7 having a Young's modulus of 200 MPa in JISK7127 has a high impact strength, pinholes caused by foreign object piercing from the core material 3 side due to impact when released into the atmosphere are difficult to pierce. Occurrence can be suppressed.

Further, since a low density polyethylene film having a density of 0.930 g / cm ³ or more is used for the heat seal layer 21, the heat seal layer 21 is compared with a high density polyethylene film and an unstretched polypropylene film. Since it has flexibility, it is possible to suppress the occurrence of pinholes from the inside of the jacket material 20 by the core material 3 for the same reason as described above.

  Further, regarding the occurrence of pinholes, since there is a polyethylene film or polypropylene film or polypropylene film having a Young's modulus of 200 MPa or less in JISK7127 having flexibility and impact resistance in the immediate vicinity of the core material 3, Can be further suppressed.

  The polyethylene film or polypropylene film used for the heat seal layer 21 has excellent flexibility and impact resistance as described above, and the polyethylene film or polypropylene film is bonded to the other film only on one side. Since the contact with the foreign matter is not made when the air is released, it is possible to contact the foreign matter in a more free shape, so that it is possible to further improve the occurrence of pinholes due to the foreign matter.

Moreover, when the said polyethylene film or a polypropylene film is used for the heat seal layer 21, the penetration | invasion amount of the air to the vacuum heat insulating material 19 compared with the polyethylene film whose density is applied normally 0.930 g / cm < ³ > or more. May increase, and the thermal conductivity of the vacuum heat insulating material becomes worse over time.

Since the heat seal width is 10 mm in the case of a polyethylene film having a density of 0.930 g / cm ³ or more, the density of the polyethylene film or polypropylene film of the heat seal layer 21 is changed by making the heat seal width larger than 10 mm. It is possible to suppress a decrease in gas barrier properties due to the above.

  In addition, although the bag shape of the jacket material 3 was explained in the three-side seal bag, there are four-side seal bags, gusset bags, three-side seal bags, pillow bags, center tape seal bags, etc., which are particularly specified. It is not a thing. Moreover, it does not specifically limit about the thickness of each film.

(Embodiment 5)
FIG. 6 shows a cross section of the jacket material 26 of the vacuum heat insulating material 25 of the fifth embodiment. The jacket material 26 in the present embodiment uses a polyethylene film or a polypropylene film having a thickness of about 50 μm and a Young's modulus of 200 MPa or less in JIS K7127 for the heat seal layer 27, and is adjacent to the outside of the heat seal layer 27. A plastic film having a metal foil or a base film made of a plastic film having a melting point of 150 ° C. or higher and a thickness of about 15 μm or less, a metal film, a metal oxide, or a plastic film having a deposited layer of silica; A plastic film further having a polyacrylic acid resin coating layer on the vapor deposition layer is used, and the second protective layer 29 and the first protective layer 30 adjacent to the outside of the gas barrier layer 28 have a thickness of about A nylon film of 25 μm or less is used.

  The entire circumference of the cross section of the jacket material 26 of the vacuum heat insulating material 25 is coated with an ethylene polyvinyl alcohol copolymer or a polyacrylic acid resin. Between each film layer of the jacket material 26, there is an approximately 3 μm urethane-based adhesive layer, and each film is laminated by this adhesive layer. The detailed description of the same configuration as in the first to fourth embodiments is omitted.

  The heat seal layer 27 of the vacuum heat insulating material 26 is made of a polyethylene film or a polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127, and the outer covering material 26 is a core material by the introduced air when released to the atmosphere due to its flexibility. 3, since the outer covering material 26 has a polyethylene film or polypropylene film having excellent flexibility, the outer covering material 26 is easily deformed in the above situation, so that the core material 3 The polyethylene film or polypropylene film 7 having a Young's modulus of 200 MPa or less according to JISK7127 has a high impact strength, so that the foreign material is pierced by the foreign material from the core material 3 side due to the impact when released to the atmosphere. Generation of pinholes can be suppressed.

Moreover, since the heat seal layer 27 uses a low density polyethylene film having a density of 0.930 g / cm ³ or more, the heat seal layer 27 is compared with a high density polyethylene film and an unstretched polypropylene film. Since it has more flexibility, it is possible to suppress the occurrence of pinholes from the inside of the jacket material 26 by the core material 3 for the same reason as described above.

  As for the occurrence of pinholes, since there is a polyethylene film or polypropylene film having a Young's modulus of 200 MPa or less in JISK7127, which has flexibility and impact resistance, in the immediate vicinity of the core material 3, the occurrence of pinholes is prevented. It can be suppressed more.

However, when this polyethylene film or polypropylene film is used for the heat seal layer 27, the gas barrier property may be inferior compared with a polyethylene film having a density of 0.930 g / cm ³ or more which is usually applied. In such a case, the amount of air entering the vacuum heat insulating material increases, and the thermal conductivity of the vacuum heat insulating material may become worse over time.

  As the intrusion path of air into the vacuum heat insulating material 25, intrusion from the gas barrier layer 28 of the vacuum heat insulating material 25 and intrusion from the cross section of the heat seal layer 27 can be considered. Intrusion from the cross section of the heat seal layer 27 therein can be suppressed by coating the cross section with a gas barrier material.

  By using an ethylene polyvinyl alcohol copolymer or a polyacrylic acid resin with good gas barrier properties for this coating, it is possible to suppress the intrusion of air from the cross section of the jacket material 25, and therefore the heat seal layer 27. Therefore, it is possible to suppress a decrease in gas barrier properties caused by changing the Young's modulus of the polyethylene film or polypropylene film, and to obtain the jacket material 25 having very good pinhole resistance.

  As described above, the laminate film and the package of the present invention are very excellent in pinhole resistance, and thus are suitable as a cover material for a vacuum heat insulating material. In addition, the vacuum insulation material has excellent pinhole resistance, so cooking appliances such as refrigerators, electric water heaters, and IH cooking heaters, and information equipment such as printing machines, copiers, liquid crystal projectors, and laptop computers It can also be applied to industrial equipment such as semiconductor manufacturing equipment.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention The principal part expanded sectional view of the jacket material of the vacuum heat insulating material in Embodiment 1 of this invention The principal part expanded sectional view of the jacket material of the vacuum heat insulating material in Embodiment 2 of this invention The principal part expanded sectional view of the jacket material of the vacuum heat insulating material in Embodiment 3 of this invention The principal part expanded sectional view of the jacket material of the vacuum heat insulating material in Embodiment 4 of this invention The principal part expanded sectional view of the jacket material of the vacuum heat insulating material in Embodiment 5 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Outer covering material 3 Core material 5 Heat seal layer 6 Gas barrier layer 7 Second protective layer 10 Outer covering material 11 Vacuum insulating material 12 Outer covering material 13 First protective layer 14 Vacuum insulating material 15 Outer covering Material 16 Gas barrier layer 17 Polyethylene terephthalate film 17a Heat seal layer 18 Protective layer 19 Vacuum heat insulating material 20 Outer cover material 21 Heat seal layer 22 Gas barrier layer 25 Vacuum heat insulating material 26 Outer cover material 27 Heat seal layer 28 Gas barrier layer 31 Coat layer

Claims (11)

  A laminate film obtained by laminating a heat seal layer, a gas barrier layer, a polyethylene film layer or a polypropylene film layer having a Young's modulus of 200 MPa or less according to JISK7127, and a protective layer in this order.   Heat sealing layers, gas barrier layers, polyethylene film layers having a Young's modulus in JISK7127 of 200 MPa or less or polypropylene film layers, and the heat seal layers of the laminate film formed by laminating with an adhesive in the order of protective layers, A package characterized by filling an object inside.   Heat sealing layers, gas barrier layers, polyethylene film layers having a Young's modulus in JISK7127 of 200 MPa or less or polypropylene film layers, and the heat seal layers of the laminate film formed by laminating with an adhesive in the order of protective layers, A vacuum heat insulating material that is filled with a core material under reduced pressure.   4. The vacuum heat insulating material according to claim 3, wherein a nylon film is used for the protective layer.   The vacuum heat insulating material according to claim 3, wherein a polyethylene terephthalate film is used for the protective layer.   Heat-sealing the heat-seal layers of a laminate film formed by laminating with an adhesive in the order of heat seal layer, polyethylene terephthalate film layer, gas barrier layer, polyethylene film layer having a Young's modulus of 200 MPa or less or polypropylene film layer in JISK7127 And a vacuum heat insulating material obtained by filling the inside with a core material under reduced pressure. The vacuum heat insulating material according to any one of claims 1 to 6, wherein a low density polyethylene film having a heat seal layer density of 0.930 g / cm ³ or more is used.   A laminate film obtained by laminating a heat seal layer, a gas barrier layer, and a protective layer with an adhesive in this order using a polyethylene film or polypropylene film having a Young's modulus of 200 MPa or less according to JISK7127.   The heat seal layers of a laminate film formed by laminating with an adhesive in the order of a heat seal layer, a gas barrier layer, and a protective layer using a polyethylene film or polypropylene film having a Young's modulus of JISK7127 of 200 MPa or less are thermally welded together. A packaging body characterized by filling an object inside.   The heat seal layers of a laminate film formed by laminating with an adhesive in the order of a heat seal layer, a gas barrier layer, and a protective layer using a polyethylene film or polypropylene film having a Young's modulus of JISK7127 of 200 MPa or less are thermally welded together. A vacuum heat insulating material obtained by filling the inside with a core material under reduced pressure.   11. The vacuum heat insulating material according to claim 10, wherein a cross section of the laminate film is coated with an ethylene polyvinyl alcohol copolymer or a polyacrylic acid resin.

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