JP2012026513A - Bag body, and vacuum heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag body having long-term superior sealing properties.SOLUTION: In this vacuum heat insulating material 1, a core material 2, which consists of a glass-fiber laminated body, is sealed under a low pressure as a filler between two outer covering materials 3 whose heat welding layers 6 are arranged opposite to each other, and the heat welding layers 6 on the outer peripheral parts of the outer covering materials 3 are heat welded to each other. When viewing a cross-section, cut by a plane perpendicular to the peripheral edge of an outer covering material 3, of at least a part of a sealed part 7 where the heat welding layers 6 on the outer peripheral parts of the outer covering materials 3 are heat welded to each other, a heat welding layer 6 located in the sealed part 7 has at least one recessed part, a thin wall part 8, in which the thickness of the heat welding layer 6 is thinner than the thickness of the peripheral part of a deepest part, is formed in the deepest part of the recessed part, and two sealing grooves 9 made by continuing the recessed parts out in a circumferential direction of the outer covering material 3 are formed continuously over at least two adjacent edges of the outer covering material 3 without branching off or intersecting halfway. Therefore, cracking and thinning of a gas barrier layer are prevented, and the long-term superior sealing properties (vacuum performance) can be maintained.

Description

  The present invention relates to a bag for sealing a filling and a vacuum heat insulating material using the bag.

  In recent years, foods such as confectionery or medicines can be stored in a sealed bag to enable long-term storage, or a fiber body is vacuum sealed in a sealed bag to form a vacuum heat insulating material.

  Here, a vacuum heat insulating material will be described as an example. As measures against global warming, which is a serious global environmental problem, there is an active movement to promote energy saving in home appliances, equipment, and buildings such as houses, and vacuum insulation that has an excellent thermal insulation effect over the long term But more than ever.

  The vacuum heat insulating material is a material in which a core material having fine voids such as glass wool or silica powder is covered with a jacket material having gas barrier properties, and the inside of the jacket material is sealed under reduced pressure. The vacuum heat insulating material enables a high heat insulating effect to be exhibited by keeping the inner space of the jacket material at a high vacuum and reducing the amount of heat transmitted through the gas phase as much as possible. Therefore, in order to exhibit the excellent heat insulating effect over a long period of time, a technique for maintaining a high degree of vacuum inside the vacuum heat insulating material (inside the jacket material) is extremely important.

  As a method for maintaining the degree of vacuum inside the vacuum heat insulating material, a method in which a gas adsorbent or a moisture adsorbent is sealed under reduced pressure inside the vacuum heat insulating material together with the core material is generally used. As a result, residual moisture released into the vacuum heat insulating material from the minute gaps in the core material after vacuum packaging, or atmospheric gases such as water vapor and oxygen that permeate through the jacket material from the outside air and permeate into the vacuum heat insulating material over time. Can be removed.

  However, considering the adsorption capacity of existing adsorbents, it can be said that the use of adsorbents alone is not sufficient to provide vacuum insulation that maintains a high thermal insulation effect over the long term. It is necessary to take measures to control the amount of atmospheric gas that is generated.

  Here, the case where the filling material is discharged from the sealed bag body filled with gas or liquid to the outside air and the case where it enters the bag body from the outside air like a vacuum heat insulating material can be considered. The gas intrusion route will be described taking the material as an example.

  The vacuum heat insulating material is usually sealed in a three-side seal bag made by superimposing two rectangular outer jacket materials and heat-sealing the outer peripheral portions of the outer periphery of the three sides of the outer jacket material. It is manufactured by inserting the core material from the opening of the bag and thermally welding the opening of the three-side seal bag while evacuating the inside of the bag of the jacket material using a vacuum packaging machine.

  The outer cover material is usually a heat-welded layer made of a thermoplastic resin such as low density polyethylene in the innermost layer, a gas barrier layer made of a material having gas barrier properties such as an aluminum foil or an aluminum vapor deposited film in the intermediate layer, and an outermost layer in the outer layer. Uses a laminated film obtained by laminating a surface protective layer such as a nylon film or a polyethylene terephthalate film through an adhesive.

  In this case, the atmospheric gas that permeates from the outside air into the vacuum heat insulating material is a component that permeates through the pinholes of the aluminum foil on the surface of the jacket material or the gaps between the vapor deposition layers, and the heat-welded layer on the edge surface of the jacket material Are classified into two types, that is, a component that penetrates from the exposed portion to the inside through the sealing portion.

  Of these, the thermoplastic resin constituting the heat-welded layer has extremely high gas permeability and moisture permeability compared to the gas barrier layer. Most of the material is transmitted through the sealing portion to the inside from the exposed portion of the heat-welded layer on the end surface of the peripheral edge of the workpiece.

  Therefore, in order to provide a vacuum heat insulating material having excellent heat insulating performance over a long period of time, it is indispensable to suppress the amount of atmospheric gas permeation from the portion where the heat-welded layer on the edge surface of the outer jacket material is exposed. Techniques have been a challenge.

  In response to this problem, there has been reported a vacuum heat insulating material provided with a thin portion in which a part of the heat-welded layer in the sealing portion is thin (see, for example, Patent Document 1).

  7 is a plan view of the conventional vacuum heat insulating material described in Patent Document 1, FIG. 8 is a cross-sectional view of the conventional vacuum heat insulating material described in Patent Document 1, and FIG. It is an enlarged view of the sealing part of sectional drawing of the described conventional vacuum heat insulating material.

  As shown in FIGS. 7 to 9, the vacuum heat insulating material 101 is composed of a core material 102 and a jacket material 103 that seals the core material 102 under reduced pressure, and the jacket material 103 is directed from the outer layer side toward the inner layer side. The surface protective layer 104, the gas barrier layer 105, and the heat welding layer 106 are laminated in this order.

  A part of the heat-welding layer 106 of the sealing portion 107, which is a portion where the heat-welding layers 106 facing each other of the two outer cover materials 103 are heat-welded, is thin. The thin portion 108 is formed by particularly strongly heating and compressing a part of the covering material 103 in the sealing portion 107, and a seal groove 109 is formed on the outer peripheral side of the covering material 103.

  In the conventional configuration, the thin wall portion 108 increases the permeation resistance of the gas that permeates and penetrates the thermal welding layer 106 from the end surface of the outer periphery of the outer covering material 103, and suppresses the gas intrusion into the interior, thereby providing excellent heat insulation over a long period It is said that performance can be demonstrated.

Japanese Utility Model Publication No. 62-141190

  In the configuration of Patent Document 1, the thin-walled portion 108 is formed on the side of the outer peripheral portion of the jacket material 103. Usually, in order to form the thin portion 108 on the side of the outer covering material 103, that is, to form the sealing groove 109, two rectangular outer covering materials 103 having the same size are once stacked so that the heat-welding layers 106 face each other. Then, heat welding in the length direction is performed, and then heat welding in the width direction is performed.

  As a result, the corner portion 110 of the vacuum heat insulating material 101 is thermally welded twice, and excessive tension is applied to the gas barrier layer 105 of the thin portion 108 of the sealing portion 107 in particular, and the corner portion 110 of the vacuum heat insulating material 101 is heated. There is a possibility that the gas barrier layer 105 may be cracked, thinned, or the sealing portion is broken.

  When these gas barrier layers 105 are cracked or thinned, there is a problem that the penetration of atmospheric gas components into the vacuum heat insulating material 101 is promoted over time and the performance deterioration is accelerated. In addition, this problem is not limited to the vacuum heat insulating material, and there is a problem that the sealing performance is similarly lowered in other sealing bags.

  In view of the above-mentioned conventional problems, the present invention reduces the occurrence of cracking and thinning of the gas barrier layer and the breaking of the sealing portion in the thin portion of the heat-welded layer provided in the sealing portion and the vicinity thereof for a long period of time. An object is to provide a highly airtight bag.

  In order to achieve the above object, in the bag of the present invention, the filler is sealed between the two outer jacket materials facing each other, and the outer peripheral portions of the outer jacket material are bonded to each other. A thermally welded bag body, in which at least a part of a sealing portion where the heat-welded layers of the outer peripheral portion of the jacket material are heat-welded is cut along a plane perpendicular to the periphery of the jacket material When the cross section is viewed, the thermal welding layer located in the sealing portion has at least one concave portion, and the thickness of the thermal welding layer is thinner at the deepest portion of the concave portion than the peripheral portion of the deepest portion. A thin-walled portion is formed, and grooves formed by the recesses being continuous in the circumferential direction of the jacket material are formed continuously without branching or intersecting at least over two adjacent sides of the jacket material. It has been done.

  In the above configuration, first, by providing a thin portion on the heat-welded layer of the sealing portion where the heat-welded layers on the outer peripheral portion of the jacket material are heat-welded, the gas and moisture entering from the end surface of the outer periphery of the jacket material Since the permeation area of the gas and moisture is increased, the gas and moisture permeation resistance is increased, and the gas and moisture permeation rate is reduced. The amount of gas and moisture that permeate over time can be suppressed, and a highly sealed bag body can be provided over a long period of time. When this bag body is used as a vacuum heat insulating material, excellent vacuum performance is maintained over a long period of time. A highly airtight bag can be provided.

  In addition, the grooves formed by the continuous recesses where the thin-walled portions are formed in the circumferential direction of the jacket material are formed continuously without branching or intersecting at least over two adjacent sides of the jacket material. The heat welding of the corners of the bag body can be completed only once. Therefore, the tension applied to the gas barrier layer can be reduced, and the risk that the gas barrier layer is cracked or thinned, and the sealing portion is broken can be reduced.

  As described above, in the thin portion of the heat-welded layer provided in the sealing portion and the gas barrier layer in the vicinity thereof, generation of cracks and thinning of the heat-sealed sealing portion are extremely unlikely to occur, and the sealability is long-lasting. A high bag body can be provided, and when this bag body is used as a vacuum heat insulating material, excellent vacuum performance can be maintained over a long period of time.

  According to the present invention, the gas and moisture entering from the end surface of the outer periphery of the jacket material are provided by providing the thin-walled portion in the heat weld layer of the sealing portion where the heat weld layers of the outer periphery of the jacket material are heat welded to each other. Since the permeation area of the gas and moisture is increased, the gas and moisture permeation resistance is increased, and the gas and moisture permeation rate is reduced. The amount of gas and moisture that permeate over time can be suppressed, and a highly sealed bag body can be provided over a long period of time. When this bag body is used as a vacuum heat insulating material, excellent vacuum performance is maintained over a long period of time. A highly airtight bag can be provided.

  In addition, the grooves formed by the continuous recesses where the thin-walled portions are formed in the circumferential direction of the jacket material are formed continuously without branching or intersecting at least over two adjacent sides of the jacket material. The heat welding of the corners of the bag body can be completed only once. Therefore, the tension applied to the gas barrier layer can be reduced, and the risk that the gas barrier layer is cracked or thinned, and the sealing portion is broken can be reduced.

As described above, in the thin portion of the heat-welded layer provided in the sealing portion and the gas barrier layer in the vicinity thereof, generation of cracks and thinning of the heat-sealed sealing portion are extremely unlikely to occur, and the sealability is long-lasting. A high bag body can be provided, and when this bag body is used as a vacuum heat insulating material, excellent vacuum performance can be maintained over a long period of time.

  In addition, when this bag body is used as a vacuum heat insulating material, the amount of gas entering through the heat-welded layer on the side heat-welded from the outer surface of the jacket material is suppressed, so that it is heat-welded by forming a thin portion. Since the vacuum performance does not deteriorate even if the width of the heat-welded side formed on the outer peripheral portion of the jacket material is shortened to the extent that it can be offset with the increase in the permeation resistance of the other side, the bag having the same size filling The size of the jacket material used for the body can be reduced, and the material cost can be reduced.

The top view of the vacuum heat insulating material using the bag body in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material using the bag body of the embodiment Sectional drawing which shows the sealing part containing the thin part in the bag body of the embodiment The top view of the vacuum heat insulating material using the bag body of the modification of the embodiment The top view of the vacuum heat insulating material using the bag body in Embodiment 2 of this invention The top view of the vacuum heat insulating material using the bag body of the modification of the embodiment Plan view of conventional vacuum insulation Cross section of conventional vacuum insulation Sectional drawing which shows the sealing part containing the thin part in the conventional vacuum heat insulating material

  The first invention is a bag body in which a filler is sealed between two outer jacket materials facing each other and the thermal welding layers on the outer periphery of the outer jacket material are thermally welded. When the cross-section of the sealing part in which at least a part of the heat-welded layers of the outer peripheral part of the outer cover material is heat-welded is cut along a plane perpendicular to the peripheral edge of the outer cover material, the sealing is performed. The heat-welded layer located in the portion has at least one recess, and a thin-walled portion is formed in the deepest portion of the recess, the thickness of the heat-welded layer being thinner than the peripheral portion of the deepest portion, It is a bag body in which a groove formed by a concave portion continuing in the circumferential direction of the jacket material is formed continuously without branching or intersecting at least over two adjacent sides of the jacket material.

  In the above configuration, first, by providing a thin portion on the heat-welded layer of the sealing portion where the heat-welded layers on the outer peripheral portion of the jacket material are heat-welded, the gas and moisture entering from the end surface of the outer periphery of the jacket material Since the permeation area of the gas and moisture is increased, the gas and moisture permeation resistance is increased, and the gas and moisture permeation rate is reduced. The amount of gas and moisture that permeate over time can be suppressed, and a highly sealed bag body can be provided over a long period of time. When this bag body is used as a vacuum heat insulating material, excellent vacuum performance is maintained over a long period of time. A highly airtight bag can be provided.

  In addition, the grooves formed by the continuous recesses where the thin-walled portions are formed in the circumferential direction of the jacket material are formed continuously without branching or intersecting at least over two adjacent sides of the jacket material. The heat welding of the corners of the bag body can be completed only once. Therefore, the tension applied to the gas barrier layer can be reduced, and the risk that the gas barrier layer is cracked or thinned, and the sealing portion is broken can be reduced.

  As described above, in the thin portion of the heat-welded layer provided in the sealing portion and the gas barrier layer in the vicinity thereof, generation of cracks and thinning of the heat-sealed sealing portion are extremely unlikely to occur, and the sealability is long-lasting. A high bag body can be provided, and when this bag body is used as a vacuum heat insulating material, excellent vacuum performance can be maintained over a long period of time.

  In addition, when this bag body is used as a vacuum heat insulating material, the amount of gas entering through the heat-welded layer on the side heat-welded from the outer surface of the jacket material is suppressed, so that it is heat-welded by forming a thin portion. Since the vacuum performance does not deteriorate even if the width of the heat-welded side formed on the outer peripheral portion of the jacket material is shortened to the extent that it can be offset with the increase in the permeation resistance of the other side, the bag having the same size filling The size of the jacket material used for the body can be reduced, and the material cost can be reduced.

  Next, the constituent material of the bag will be described.

  The heat welding layer constituting the jacket material is not particularly specified, but a low density polyethylene film, a linear low density polyethylene film, a high density polyethylene film, a medium density polyethylene film, a polypropylene film, a polyacrylonitrile film, etc. These thermoplastic resins or mixed films thereof can be used.

  The filler is not particularly specified as to the type, but is a porous body having a gas phase ratio of about 90%, open-celled bodies such as urethane foam, styrene foam, phenol foam, glass wool, rock wool, alumina fiber, Conventionally known fillers such as fiber bodies such as silica alumina fibers, powders such as perlite, wet silica, and dry silica can be used.

  The laminate adhesive used for the jacket material is not particularly specified, and conventionally known laminate adhesives such as two-component curable urethane adhesives or epoxy resin adhesives can be used.

  In the second invention, in particular, in the first invention, adjacent grooves on the two sides are connected with a smooth curve, and adjacent grooves on the two sides are connected with a smooth curve. In the thin-walled portion of the heat-welded layer provided in the sealing portion and the gas barrier layer in the vicinity thereof, generation of cracks and breakage of the sealed portion of the heat-welded side are less likely to occur than in the first invention, and over a long period of time. A highly airtight bag can be provided, and when this bag is used as a vacuum heat insulating material, excellent vacuum performance can be maintained over a long period of time.

  3rd invention is the vacuum heat insulating material formed by sealing the glass fiber as a filling in the bag body of 1st or 2nd invention under reduced pressure.

  Thereby, when a filler consists of glass fiber, heat conductivity can be made small and a vacuum heat insulating material with high heat insulation performance can be provided.

  Hereinafter, embodiments of the bag of the present invention will be described with reference to the drawings, taking a vacuum heat insulating material as an example. Note that the same reference numerals are given to the same components as those of the above-described embodiment, and the detailed description thereof will be omitted. Further, the present invention is not limited to the embodiments. The use of the bag is not limited to the vacuum heat insulating material.

(Embodiment 1)
FIG. 1 is a plan view of a vacuum heat insulating material using a bag body according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the vacuum heat insulating material using the bag body of the same embodiment. 3 is an enlarged cross-sectional view showing a sealing portion including a thin portion in the bag body of the same embodiment.

  As shown in FIG. 1 to FIG. 3, the vacuum heat insulating material 1 according to the present embodiment includes a core material 2 and two rectangular outer covering materials 3 cut to the same dimensions. 3, the core material 2 is sealed under reduced pressure, and the outer peripheral portions in the vicinity of the peripheral edges of the two jacket materials 3 covering the core material 2 are heat-welded.

The two jacket materials 3 are laminated films in which a surface protective layer 4, a gas barrier layer 5, and a heat welding layer 6 are laminated from the outer layer side toward the inner layer side. Moreover, there is a sealing portion 7 in which the two heat-sealable layers 6 of the outer covering material 3 are melted and bonded to each other on the heat-welded side of the peripheral side (outer peripheral portion) of the outer covering material 3, Of the four sides of the sealing portion 7, all four sides have seal grooves 9 that form the thin portions 8.

  Moreover, the core material 2 of the filling is made of glass fiber.

  The jacket material 3 includes a 50 μm-thick linear low-density polyethylene film as the heat welding layer 6, a 6 μm-thick aluminum foil as the gas barrier layer 5, and two 15 μm and 25 μm-thick nylon films as the surface protective layer 4. Laminated. An aluminum vapor deposition film may be applied to the gas barrier layer, or a combination of an aluminum vapor deposition film and an aluminum foil may be applied.

  Next, an example of the manufacturing method of the vacuum heat insulating material 1 of this Embodiment comprised as mentioned above is demonstrated based on FIGS.

  First, two rectangular outer cover materials 3 having the same size and having the heat-welding layer 6 on one side are arranged so that the heat-welding layers 6 face each other, and the three sides around the outer cover material 3 are heated. Weld to form a bag.

  Thereafter, the core material 2 made of glass fiber is inserted into the bag from the remaining side that becomes the opening for insertion of the bag of the jacket material 3, and the jacket material is decompressed to about 200 Pa or less. A vacuum heat insulating material 1 is obtained by heat-sealing and sealing the remaining side that becomes the opening of the bag 3.

  However, when the outer cover material 3 is thermally welded, a metal heat compression jig having a convex portion is used, and a seal groove 9 is formed so that a concave portion is formed in the heat welding layer 6 located on the sealing portion 7 of the outer cover material 3. Then, by forming the seal groove 9, the thin portion 8 is formed in the heat welding layer 6 located in the sealing portion 7. Moreover, in the corner | angular part 10 of the vacuum heat insulating material 1, heat welding is performed at once using the metal heating compression jig which has an L-shaped convex part.

  As described above, in the vacuum heat insulating material 1 according to the present embodiment, the core material 2 made of a laminated body of glass fibers as a filler is reduced in pressure between the two outer covering materials 3 facing each other with the heat welding layers 6. It is the vacuum heat insulating material 1 which was sealed and the heat welding layers 6 of the outer peripheral part of the jacket material 3 were heat welded, Comprising: The sealing part by which the heat welding layers 6 of the outer peripheral part of the jacket material 3 were heat welded When the cross-section when cutting at least a part of 7 with a plane perpendicular to the periphery of the jacket material 3 is viewed, the heat-welded layer 6 located in the sealing portion 7 has at least one recess, A thin-walled portion 8 is formed in the deepest portion where the thickness of the heat-welded layer 6 is thinner than the peripheral portion of the deepest portion, and there are two seal grooves 9 formed by the recesses being continuous in the circumferential direction of the jacket 3. Formed continuously without branching or crossing over at least two adjacent sides (four sides in the present embodiment) of the jacket material 3 It has been.

  In the above configuration, first, by providing the thin-walled portion 8 in the heat-welding layer 6 of the sealing portion 7 in which the heat-welding layers 6 on the outer peripheral portion of the covering material 3 are heat-welded with each other, the end surface of the outer periphery of the covering material 3 The gas and moisture permeation area entering from the inside is reduced, the gas and moisture permeation resistance is increased, and the gas and moisture permeation rate is reduced. As a result, the gas and moisture amount entering from the end face of the outer periphery of the outer cover 3 Therefore, it is possible to provide the vacuum heat insulating material 1 with high hermeticity that suppresses the gas and moisture amount that permeate over time and maintains excellent vacuum performance over a long period of time.

Further, at least two adjacent sides of the jacket material 3 (four sides in the present embodiment) are formed by two recess grooves 9 formed by continuous recesses in which the thin-walled portion 8 is formed in the circumferential direction of the jacket material. Since it formed continuously, without branching or crossing over the middle, the heat welding of the corner | angular part 10 of the vacuum heat insulating material 1 can be completed by one time. Therefore, the tension applied to the gas barrier layer 5 can be reduced, and the risk that the gas barrier layer 5 is cracked or thinned, and the sealing portion 7 is broken can be reduced.

  By the above, in the thin part 8 of the heat welding layer 6 provided in the sealing part 7 and the gas barrier layer 5 in the vicinity thereof, generation of cracks or thinning and breakage of the heat-sealed sealing part 7 hardly occur. A bag body (vacuum heat insulating material 1) with high sealing performance can be provided over a long period of time, and excellent vacuum performance can be maintained over a long period of time.

  In addition, since the amount of gas penetration through the heat-welded layer 6 on the side heat-welded from the end face of the jacket material 3 is suppressed, it can be offset with the increase in the permeation resistance of the heat-welded side due to the formation of the thin portion 8. To the extent, even if the width of the heat-welded side formed on the outer peripheral portion of the jacket material 3 is shortened, the vacuum performance does not deteriorate. Therefore, the jacket material 3 used for the bag having the core material 2 of the same size. Therefore, the material cost can be reduced.

  Moreover, when a filler (core material 2) consists of glass fiber, heat conductivity can be made small and a vacuum heat insulating material with high heat insulation performance can be provided.

  In the present embodiment, the sealing portion 7 having two seal grooves 9 is provided on all four sides of the jacket material 3 so that each seal groove 9 forms a mouth shape. As shown in the example, a sealing portion 7 having two seal grooves 9 is provided on three sides of the jacket 3 excluding one side that becomes the opening portion of the bag, and one side that becomes the opening portion of the bag is provided on one side. The sealing part 7 without the seal groove 9 may be provided so that each seal groove 9 forms a U-shape.

(Embodiment 2)
FIG. 5 is a plan view of a vacuum heat insulating material using a bag body according to Embodiment 2 of the present invention. The present embodiment is the same as the first embodiment except for the pattern of the sealing portion 7 and the seal groove 9, and the same components as those of the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted. .

  In the second embodiment shown in FIG. 5, a metal heat compression jig having a convex portion is used at the time of thermal welding of the jacket material 3, and a concave portion is formed in the thermal welding layer 6 located at the sealing portion 7 of the jacket material 3. By forming the seal groove 9 that can be formed, and forming the seal groove 9, the thin-walled portion 8 is formed in the heat-welded layer 6 located in the sealing portion 7.

  Moreover, in the corner | angular part 10 of the vacuum heat insulating material 1, it heat-welds at once using the metal heating compression jig which has a smooth curvilinear convex part, and the corner | angular part 10 of the vacuum heat insulating material 1 continues smoothly. The seal groove 9 is formed by the single line.

  Thereby, the vacuum heat insulating material 1 of this Embodiment can reduce the tension | tensile_strength added to the gas barrier layer 5 by the thin part 8 in the sealing part 7 also in the corner | angular part 10 of the vacuum heat insulating material 1, and the gas barrier layer It is possible to reduce the risk of cracking, thinning, and sealing part breakage.

  Moreover, since the width | variety of the sealing part of a bag body can be reduced by a part for performance improvement compared with the conventional bag body which has the performance equivalent to these embodiment, since a material can be used without waste, the cheap vacuum heat insulating material 1 Can provide.

In the vacuum heat insulating material 1 of the present embodiment, two adjacent sides (four sides in the present embodiment) are connected by a smooth curve, and the adjacent two sides of the groove are smooth curves. (In this embodiment, arcs), the cracks and the heat-sealed sides are sealed in the thin-walled portion 8 of the heat-welding layer 6 provided in the sealing portion 7 and the gas barrier layer 5 in the vicinity thereof. The breakage of the stop portion 7 is less likely to occur than in the first embodiment, and a bag body (vacuum heat insulating material) having a high hermeticity can be provided over a long period of time, and excellent vacuum performance can be maintained over a long period of time. .

  In the present embodiment, sealing portions 7 having two seal grooves 9 are provided on all four sides of the jacket material 3 so that each seal groove 9 forms a shape with rounded corners of the mouth shape. However, as shown in the modified example of FIG. 6, a sealing portion 7 having two seal grooves 9 is provided on three sides of the jacket material 3 excluding one side that becomes the opening portion of the bag, and the bag opening The sealing part 7 without the seal groove 9 may be provided on one side to be a part, and each seal groove 9 may be formed in a shape having a rounded U-shaped corner.

  In the first embodiment and the second embodiment, the structure in which the inside of the bag body is vacuum-welded and thermally welded has been described. However, as an application other than the vacuum heat insulating material, gas, liquid, or the like is used in the bag body. The same effect can be expected with the structure to be sealed.

  The bag according to the present invention can prevent cracking and thinning of the gas barrier layer and suppress the amount of gas and moisture that permeate over time. Therefore, it can be applied to uses such as vacuum insulation materials mounted on refrigerators, vending machines, etc., foods such as confectionery, and sealed bags for medicines.

1 Vacuum insulation material 2 Core material (filler)
3 Outer Material 4 Surface Protection Layer 5 Gas Barrier Layer 6 Thermal Welding Layer 7 Sealing Portion 8 Thin Wall 9 Sealing Groove 10 Corner

Claims (3)

A bag body in which a filler is sealed between two outer jacket materials facing each other, and the outer periphery of the outer jacket material is thermally welded to each other. The heat located in the sealing portion when the cross section when cutting at least a part of the sealing portion in which the heat-welding layers on the outer peripheral portion are heat-welded is cut along a plane perpendicular to the peripheral edge of the jacket material. The weld layer has at least one concave portion, and a thin-walled portion is formed in the deepest portion of the concave portion where the thickness of the thermal weld layer is thinner than the peripheral portion of the deepest portion, and the concave portion is the outer covering material. The bag body by which the groove | channel which is formed by continuing in the circumferential direction of this is continuously formed at least on the two adjacent sides of the jacket material without branching or crossing in the middle. The bag according to claim 1, wherein grooves on two adjacent sides are connected by a smooth curve. The vacuum heat insulating material formed by sealing the glass fiber as a filling in the bag body of Claim 1 or 2 under reduced pressure.

Images