JP2012026512A - Bag body and vacuum heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material that can maintain a heat insulating effect for a long period of time, and has superior recycling property.SOLUTION: An exterior covering member 3 is constituted of a surface protection layer 4, an inside protection layer 5, a gas barrier 6 and a heat welding layer 7. Upon viewing a cross section when at least part of a sealed part 8 in which external peripheries of the exterior covering material 3 are heat-welded to each other is cut at a flat face vertical to the peripheral edge, the heat welding layer 7 located at the sealed part 8 has at least one recess, and a thin-thickness part 9 thinner than the periphery of the deepest part in the thickness of the heat welding layer 7 is formed at the deepest part of the recess. By this arrangement, an atmospheric gas amount intruding from the end face of the peripheral edge of the exterior covering material 3 through the sealed part 8 can be suppressed, the heat bridge is suppressed, and the vacuum insulating material 12 sufficiently achieved in a low solid-heat conductive component which an inorganic fiber originally possesses, and high in heat insulating effect can be provided. Furthermore, since a notch is formed along the peripheral edge of the exterior covering material 3, and a core material 13 accommodated in an inner bag 13a is sealed, the vacuum heat insulating material 12 easy in the reutilization of the core material 13 can be provided.

Description

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

  In recent years, food such as confectionery and beverages, or liquid, gas, solid chemicals and household goods can be stored in a sealed bag for long-term storage, or foam, powder and fiber can be vacuum sealed in a sealed bag. Insulation materials and bag sealing techniques are widely used. 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 maintains an excellent thermal insulation effect over the long term More material is needed than ever before.

  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 can realize a high heat insulating effect by keeping the inner space in a high vacuum and reducing the amount of heat transmitted through the gas phase as much as possible. Therefore, a technique for maintaining a high degree of vacuum inside the vacuum heat insulating material is extremely important in order to exhibit the excellent heat insulating effect over a long period of time.

  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, a gas path entering from the outside air into the vacuum heat insulating material will be described.

  The vacuum heat insulating material is usually a three-side seal bag into a three-side seal bag prepared by superposing two rectangular outer cover materials and heat-sealing the outer peripheral portions of the three peripheral edges of the outer cover material. It is manufactured by inserting a core material from the opening portion of the bag and heat-welding the opening portion 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 a barrier property 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 passes through the sealing portion from the portion where the component that permeates from the surface of the jacket material and the heat-welded layer on the edge surface of the jacket material are exposed. And the components that permeate inside.

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 insulation material that maintains excellent heat insulation performance over a long period of time, it is indispensable to suppress the amount of atmospheric gas permeation from the exposed part of the edge of the outer periphery of the outer jacket material. 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).

  FIG. 7 is a cross-sectional view of a conventional vacuum heat insulating material described in Patent Document 1.

  As shown in FIG. 7, the conventional vacuum heat insulating material 101 described in Patent Document 1 has a part of the thermal welding layer 103 in the sealing portion of the outer covering material 104 having the gas barrier layer 102 and the thermal welding layer 103. It is thin. The thin-walled portion 105 is formed by using a heating and pressing jig 106 as shown in FIG. 8 to particularly strongly press a part of the jacket material 104 in the sealed portion. It is formed so as to surround the entire circumference. At this time, due to the protrusion shape of the heating and pressing jig 106, the gas barrier layer 102 has a corner 107 (a portion having a square shape).

  In the conventional configuration, the thin wall portion 105 increases the permeation resistance of the gas entering from the end surface of the outer periphery of the outer covering material 104, and can suppress the gas intrusion into the inside, thereby exhibiting excellent heat insulation performance for a long time. ing.

  Furthermore, in order to provide a vacuum heat insulating material that maintains excellent heat insulating performance over a long period of time, it is an object to suppress the permeation amount of the atmospheric gas that permeates from the surface of the remaining jacket material.

  In response to this problem, a vacuum heat insulating material in which an aluminum foil is provided on a gas barrier layer has been reported (see, for example, Patent Document 2).

  FIG. 9 is a cross-sectional view of a conventional vacuum heat insulating material described in Patent Document 2. As shown in FIG. 9, in the conventional vacuum heat insulating material described in Patent Document 2, the heat insulating material 202 is filled in the laminated film container 201, and the laminated film containers 201 are thermally welded to the outer periphery of the heat insulating material 202. The fin-like heat welding portion 203 is provided.

  FIG. 10 is an enlarged cross-sectional view of a conventional laminated film container 201 of a vacuum heat insulating material described in Patent Document 2. As shown in FIG. 10, the laminate film container 201 includes a heat welding layer 204, an aluminum foil layer 205, and a surface protective layer 206.

  According to the conventional configuration, the aluminum foil layer 205 is an aluminum foil having a thickness of 20 μm or less, so that a vacuum can be maintained for a long time without causing pinholes or cracks in the aluminum foil layer 205.

Japanese Utility Model Publication No. 62-141190 Japanese Patent Publication No. 2-54479

  In order to provide a bag body that maintains excellent sealing performance for a longer period of time and a vacuum heat insulating material that maintains heat insulating performance, a component that permeates from the surface of the outer jacket material and a heat-welded layer on the edge of the outer edge of the outer jacket material are provided. It is necessary to suppress the permeation amount of both atmospheric gases from the exposed portion through the sealing portion to the inside.

  However, when the heat compression jig described in Patent Document 1 is used at the time of heat welding of the heat welding part of the vacuum heat insulating material using the laminate film container 201 of Patent Document 2 as shown in FIG. In the thin wall portion, a corner portion 207 as shown in FIG. 11 is formed, and cracks are generated in the laminate film container 201, particularly the aluminum foil 205, in the corner portion 207 when the vacuum heat insulating material is manufactured and handled. From this crack, there was a problem that the penetration of atmospheric gas components into the vacuum heat insulating material was promoted over time.

  Here, the corner portion 207 is a heat generated at the boundary of the thin portion and the vicinity thereof when the cross section when the sealing portion is cut by a plane perpendicular to the periphery of the laminate film container 201 (cover material) is seen. It refers to a square-shaped part (a part having a large curvature) formed with a change in the thickness of the weld layer 204.

  Moreover, about what sealed the heat insulation core material with the laminated film of 2 sheets, in patent document 2, the countermeasure against the gas and water vapor | steam which penetrate | invade into a vacuum heat insulating material through the welding part of a heat welding film is not taken. Therefore, the amount of gas and water vapor that penetrates into the gap formed by the heat insulating material 202 as the core material increases by the amount of intrusion from the vapor deposition surface, compared to the vacuum heat insulating material that uses aluminum foil as a gas barrier film. The increasing rate of the degree of vacuum in the air gap is larger than before.

  Therefore, only with the technical means of the above-mentioned Patent Document 1, there is no description about the change over time in the thermal conductivity even though there is a description about the thermal conductivity immediately after the vacuum heat insulating material is manufactured and the gas barrier property of the laminated film, It is difficult to say that the vacuum state inside the exterior body is maintained and the heat insulation performance can be maintained.

  In addition, when recycling vacuum insulation, there is known a method of separating and reusing the core material and the jacket material using the difference in specific gravity after pulverization, but it takes a lot of energy during regeneration. Thus, there is a need for a method for easily separating the core material and the jacket material.

  The present invention solves the above-described conventional problems, and the deterioration of the gas barrier layer and the breakage of the sealing part are extremely unlikely to occur in the thin-walled part of the heat-welded layer provided in the sealing part and the vicinity thereof for a long period of time. A vacuum with excellent recyclability that can maintain excellent sealing performance, maintain a good thermal insulation performance for a long period of time when a core material having fine voids as a filling is sealed under reduced pressure, and can easily separate the core material. It aims at providing the bag body used as a heat insulating material, and the vacuum heat insulating material using the same.

  In order to achieve the above object, the bag body of the present invention is a bag body for sealing a filling, in which the outer peripheral portions of two outer jacket materials or the outer peripheral portions in the vicinity of the outer periphery are thermally welded to each other. Is a sealing part comprising a laminate film laminated in the order of a surface protective layer, an internal protective layer, a gas barrier layer, and a heat welding layer from the outside to the inside, and the outer peripheral parts of the jacket material are heat welded to each other When the cross-section when cutting at least a part of the surface by a plane perpendicular to the peripheral edge is viewed, the thermal welding layer located in the sealing portion has at least one recess, and the deepest portion of the recess A thin-walled portion where the thickness of the heat-welded layer is thinner than the peripheral portion of the deepest portion is formed, and a notch or a cut is formed in at least a part of the peripheral portion of the jacket material, and the filling is Sealed in a state of being housed in an inner bag.

In the above configuration, first, when seeing a cross-section when cutting at least a part of the sealing portion in which the outer peripheral portions of the jacket material are heat-welded with each other in a plane perpendicular to the peripheral edge, thermal welding located in the sealing portion By providing a thin portion where the layer thickness is locally thin, the permeation area of gas and moisture entering from the end face of the outer periphery of the jacket material is reduced in the thin portion of the heat-welded layer, and the permeation resistance of gas and moisture Since the permeation rate of gas and moisture is reduced, the amount of gas and moisture that permeate over time is suppressed, and excellent sealing performance can be exhibited over a long period of time.

  Moreover, when the cross section when cutting at least a part of the sealing portion in which the outer peripheral portions of the jacket material are thermally welded is cut by a plane perpendicular to the peripheral edge, the protective layer includes a plurality of protective layers such as a surface protective layer and an internal protective layer. The heat welding layer bends along the shape of at least one recess in the thin portion of the sealing portion and in the vicinity thereof, but the recess is formed by a plurality of films such as a surface protective layer and an internal protective layer. Sometimes when external force is applied, the stress is gradually reduced as it becomes the inner layer, and it is difficult for stress to concentrate locally, and the deterioration of the gas barrier layer laminated on the outer layer side from the heat-welded layer occurs. It becomes extremely difficult to get up.

  Furthermore, in the thin part of the heat-welded layer, the thickness of the heat-welded layer is thinner than the peripheral part, and the strength is reduced by the thickness reduction, but the thickness of the heat-welded layer is the protrusion of the heating compression jig used for forming the recess. As the strength of the sealing portion also increases and decreases continuously and smoothly along with the increase and decrease gradually along the part, it is difficult for stress to concentrate locally in the thin part of the heat-welded layer, Deterioration of the gas barrier layer and breakage of the sealing portion in the thin-walled portion of the weld layer and the jacket material in the vicinity thereof are extremely difficult to occur.

  Furthermore, since a notch or a notch is formed in at least a part of the peripheral portion of the jacket material and the filling is sealed in a state of being stored in the inner bag, the jacket material can be easily torn and easily It is possible to take out the filling material and to protect the filling material with the inner bag when taking out the filling material inside the jacket material, and to prevent the filling material in the inner bag from being damaged.

  And when the core material having fine voids as a filling material is sealed in the bag under reduced pressure, excellent insulation performance can be maintained for a long time, and the core material is recycled in order to recycle the vacuum insulation material. When the material is taken out, the core material can be easily separated and the core material is protected by the inner bag, so that the core material in the inner bag can be prevented from being damaged, and the core material is left as it is or only the inner bag. Can be reused for the core material of the vacuum heat insulating material, and the regenerative energy can be reduced.

  As described above, the gas barrier layer is hardly deteriorated and the sealing part is hardly broken at the thin part of the heat-welded layer provided in the sealing part, and excellent sealing performance can be maintained over a long period of time. When sealed with vacuum in a state where a core material having a gap is put in an inner bag, it is possible to maintain excellent heat insulation performance over a long period of time, the core material can be easily separated, and the core material is left as it is, or the inner bag The bag body used as the vacuum heat insulating material excellent in recyclability which can be reused for the core material of a vacuum heat insulating material, and a vacuum heat insulating material using the same can be provided.

  According to the present invention, by providing the thin portion where the thickness of the heat-welding layer of the sealing portion is locally thin, the gas and moisture amount entering from the end face of the outer periphery of the outer jacket material are suppressed, and the thermal insulation layer is excellent over a long period of time. Sealing performance can be demonstrated. In addition, since the protective layer is composed of a plurality of films such as a surface protective layer and an internal protective layer, when an external force is applied during the formation of the recess, the gas barrier layer laminated on the outer layer side from the heat-welded layer is extremely deteriorated. It becomes difficult. Furthermore, it is difficult for stress to be locally concentrated in the thin portion of the heat-welded layer, and cracks and breakage of the sealing portion in the thin-wall portion of the heat-welded layer and the jacket material in the vicinity thereof are extremely unlikely to occur. Further, the present invention can also be applied to a vacuum heat insulating material in which the filling is used as a core material and the bag body is evacuated.

  As described above, in the thin-walled portion of the heat-welded layer provided in the sealing portion and in the vicinity thereof, the bag body that is extremely unlikely to cause cracking or breaking of the sealing portion and that maintains excellent sealing performance over a long period of time, and the heat insulating performance The vacuum insulation material to maintain can be provided.

  Furthermore, since a notch or a notch is formed in at least a part of the peripheral portion of the jacket material and the filling is sealed in a state of being stored in the inner bag, the jacket material can be easily torn and easily It is possible to take out the filling material, and when taking out the filling material inside the jacket material, the filling material can be protected by the inner bag, and the filling material in the inner bag can be prevented from being damaged. When the core material having the inner bag is sealed under reduced pressure, the core material can be easily separated at the time of recycling. It can be reused for the core material and the regenerative energy can be reduced.

The top view of the bag body in Embodiment 1 of this invention Sectional drawing of the bag body in Embodiment 1 of this invention Sectional drawing which shows an example of the sealing part containing the thin part of the bag body in Embodiment 1 of this invention Sectional drawing which shows an example of the heating compression jig of the bag body in Embodiment 1 of this invention Sectional drawing which shows the modification of the sealing part containing the thin part of the bag body in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material in Embodiment 2 of this invention Sectional drawing of the conventional vacuum heat insulating material described in patent document 1 Sectional drawing which shows the state which forms the thin part with the heating compression jig of the conventional vacuum heat insulating material described in patent document 1 Sectional drawing of the conventional vacuum heat insulating material described in patent document 2 Expanded sectional view of a conventional laminated film container of vacuum heat insulating material described in Patent Document 2 Sectional drawing of the sealing part containing the thin part at the time of using the heat compression jig described in patent document 1 at the time of the heat welding of the heat welding part of the vacuum heat insulating material described in patent document 2

  The first invention is a bag body for sealing a filler in which the outer peripheral portions of two outer jacket materials or the outer peripheral portions in the vicinity of the outer periphery are thermally welded, and the outer jacket material is directed from the outside to the inside. It consists of a laminate film laminated in the order of a surface protective layer, an internal protective layer, a gas barrier layer, and a heat-welded layer, and at least a part of the sealing portion in which the outer peripheral portions of the jacket material are heat-welded to each other is perpendicular to the peripheral edge When the cross section when cut in a flat plane 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 the deepest in the deepest portion of the concave portion. A thin-walled portion thinner than the peripheral portion is formed, and at least a part of a peripheral edge portion of the jacket material is formed with a notch or a notch, and the filling is sealed in a state of being accommodated in an inner bag. It is a bag body.

  In the above configuration, first, when seeing a cross-section when cutting at least a part of the sealing portion in which the outer peripheral portions of the jacket material are heat-welded with each other in a plane perpendicular to the peripheral edge, thermal welding located in the sealing portion By providing a thin portion where the layer thickness is locally thin, the permeation area of gas and moisture entering from the end face of the outer periphery of the jacket material is reduced in the thin portion of the heat-welded layer, and the permeation resistance of gas and moisture Since the permeation rate of gas and moisture is reduced, the amount of gas and moisture that permeate over time is suppressed, and excellent sealing performance can be exhibited over a long period of time.

Moreover, when the cross section when cutting at least a part of the sealing portion in which the outer peripheral portions of the jacket material are thermally welded is cut by a plane perpendicular to the peripheral edge, the protective layer includes a plurality of protective layers such as a surface protective layer and an internal protective layer The heat welding layer bends along the shape of at least one recess in the thin portion of the sealing portion and in the vicinity thereof, but the recess is formed by a plurality of films such as a surface protective layer and an internal protective layer. Sometimes when external force is applied, the stress is gradually reduced as it becomes the inner layer, and it is difficult for stress to concentrate locally, and the deterioration of the gas barrier layer laminated on the outer layer side from the heat-welded layer occurs. It becomes extremely difficult to get up.

  Furthermore, in the thin part of the heat-welded layer, the thickness of the heat-welded layer is thinner than the peripheral part, and the strength is reduced by the thickness reduction, but the thickness of the heat-welded layer is the protrusion of the heating compression jig used for forming the recess. As the strength of the sealing portion also increases and decreases continuously and smoothly along with the increase and decrease gradually along the part, it is difficult for stress to concentrate locally in the thin part of the heat-welded layer, Deterioration of the gas barrier layer and breakage of the sealing portion in the thin-walled portion of the weld layer and the jacket material in the vicinity thereof are extremely difficult to occur.

  Furthermore, since a notch or a notch is formed in at least a part of the peripheral portion of the jacket material and the filling is sealed in a state of being stored in the inner bag, the jacket material can be easily torn and easily It is possible to take out the filling material and to protect the filling material with the inner bag when taking out the filling material inside the jacket material, and to prevent the filling material in the inner bag from being damaged.

  And when the core material having fine voids as a filling material is sealed in the bag under reduced pressure, excellent insulation performance can be maintained for a long time, and the core material is recycled in order to recycle the vacuum insulation material. When the material is taken out, the core material can be easily separated and the core material is protected by the inner bag, so that the core material in the inner bag can be prevented from being damaged, and the core material is left as it is or only the inner bag. Can be reused for the core material of the vacuum heat insulating material, and the regenerative energy can be reduced.

  As described above, the gas barrier layer is hardly deteriorated and the sealing part is hardly broken at the thin part of the heat-welded layer provided in the sealing part, and excellent sealing performance can be maintained over a long period of time. When sealed with vacuum in a state where a core material having a gap is put in an inner bag, it is possible to maintain excellent heat insulation performance over a long period of time, the core material can be easily separated, and the core material is left as it is, or the inner bag The bag body used as the vacuum heat insulating material excellent in recyclability which can be reused for the core material of a vacuum heat insulating material, and a vacuum heat insulating material using the same can be provided.

  Although not particularly specified for the laminate film substrate, in order to improve the gas barrier property of the jacket material, polyamide films such as nylon-6 and nylon-66, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, etc. It is desirable to use a material having a high gas barrier property such as a polyester film, a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene-vinyl alcohol copolymer.

  Although not particularly specified as a heat-weldable film, thermoplastic films such as low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, unstretched polypropylene, polyacrylonitrile, or a mixture containing them. Body and laminate can be used.

  Moreover, although it does not specify in particular regarding an inner bag, general purpose films, such as a polyamide film and a polyester film, can be used.

  The shape of the inner bag is not particularly specified, such as a four-side sealed bag, a gusset bag, a three-side sealed bag, or a pillow bag, but it is desirable that the inner bag has a structure that can be easily evacuated with a vent hole or the like. .

  Further, the peripheral edge portion of the jacket material refers to the vicinity of the end portion of the jacket material in which the multilayer state of the jacket material is confirmed when viewed from a direction perpendicular to the multilayer direction of the jacket material. More specifically, when seen from a direction perpendicular to the multilayer direction of the jacket material, the heat-welding films are thermally welded from the end of the jacket material where the multilayer state of the jacket material is confirmed. Refers to a location within 50 mm possible. In view of reducing the amount of film used and ease of production, it is preferably within 30 mm.

  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.

  The bag shape of the jacket material is not particularly specified, such as a four-side seal bag, a gusset bag, a three-side seal bag, and a pillow bag.

  In addition, a recessed part is a sealing part when seeing the cross section at the time of cut | disconnecting at least one part of the sealing part by which the outer peripheral parts of the jacket material were heat-welded by a plane perpendicular | vertical to the periphery of a jacket material. The position of the heat-welded layer is at least one recessed portion, and the boundary line (boundary surface) between the heat-welded layer and another layer adjacent to the outside of the heat-welded layer is at least one convex toward the heat-welded layer side. It points to the curve part.

  In addition, the deepest part of a recessed part refers to the point part located in the location where the thickness of the heat welding layer located between the points on the opposing boundary surface is the thinnest among the point groups which form the recessed part. .

  Filling materials are not limited to foods such as confectionery and beverages, liquids, gases, solid chemicals and household goods, but also to the core material of vacuum heat insulating materials in which foams, powders, and fibers are vacuum-sealed. Applicable.

  2nd invention is the vacuum heat insulating material which carried out the pressure reduction sealing in the state which accommodated the core material which has a fine space | gap as a filling in the bag body of 1st invention, and was excellent in heat insulation performance over a long period of time Can be easily separated, and the core material remains as it is, or only the inner bag is newly changed and can be reused as the core material for vacuum insulation materials. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the above-described embodiments, and detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a plan view of a bag body according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the bag body according to the first embodiment, and FIG. 3 is a seal including a thin portion in the bag body according to the first embodiment. Sectional drawing which shows an example of a stop part is shown.

  In FIG. 1, a bag body 1 is composed of a filling 2 in a state accommodated in an inner bag 2 a and two rectangular outer jacket materials 3 cut to the same size. The filler 2 is hermetically sealed, and the outer peripheral portions in the vicinity of the peripheral edges of the two jacket materials 3 that cover the filler 2 are thermally welded.

  The two jacket materials 3 are laminated films in which a surface protective layer 4, an internal protective layer 5, a gas barrier layer 6, and a heat welding layer 7 are laminated in this order from the outer layer side toward the inner layer side. Further, on the peripheral side (outer peripheral part) of the jacket material 3, there is a sealing part 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together. The thin portion 9 is provided on at least three sides.

  Next, the shape of the sealing part 8 around the thin part 9 will be described.

  In FIG. 3, there is a difference in the wave height of the concave portion of the boundary surface between the thermal welding layer 7 and the gas barrier layer 6, and only the deepest portion of the concave portion provided in the boundary surface having the concave portion having a large wave height. Is located in the thin portion 9.

  Next, in the present embodiment, an example of a method for manufacturing the bag body 1 of the present embodiment shown in FIGS. 1 to 3 will be described.

  First, it arrange | positions so that the heat welding layers 7 of the two jacket materials 3 may oppose, and heat-welds the three sides of the jacket material 3 into a bag shape. At the time of this thermal welding, heat compression is performed so that the two outer cover materials 3 are sandwiched between a metal heating and compression jig 10 (see FIG. 4) and a silicon rubber heater (not shown), and the sealing of the shape shown in FIG. A stop 8 is formed. Thereafter, the filler 2 in a state accommodated in the inner bag 2a is inserted into the bag body 1, and the bag body 1 is obtained by heat-sealing and sealing the opening of the bag of the outer jacket material 3.

  In the bag body 1 of the present embodiment, the outer cover material 3 is protected in the bag body 1 in which the outer peripheral portions in the vicinity of the peripheral edges of the two outer cover materials 3 into which the filler 2 is inserted and sealed are thermally welded. The protective layer is composed of a plurality of films such as a surface protective layer 4 and an internal protective layer 5, and the outer peripheral portions of the jacket material 3 are thermally welded to each other. When the cross section when cutting at least a part of the sealed portion 8 cut along a plane perpendicular to the periphery is viewed, the heat-welded layer 7 located in the sealed portion 8 has at least one recess, A thin-walled portion 9 in which the thickness of the heat-welded layer 7 is thinner than the peripheral portion of the deepest portion is formed in the deepest portion.

  Further, the heat-welding layer 7 of the sealing portion 8 has a boundary surface with another layer (gas barrier layer 6) on both surfaces, and the wave height of the undulation of one boundary surface of the recess is the undulation of the other boundary surface of the recess. Greater than the wave height.

  Further, the deepest portion of the concave portion on the side of the thermal welding layer 7 on the one boundary surface and the deepest portion of the concave portion on the side of the thermal welding layer 7 on the other boundary surface of the concave portion. Not facing each other.

  In the example shown in FIG. 3, the sealing portion 8 has at least two thin portions 9 (four).

  In addition, a triangular wave-shaped notch is formed along the peripheral edge of the jacket material 3.

  About the bag 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The jacket material 3 is obtained by laminating a thermoplastic resin, a metal foil having a gas barrier property, a resin film, or the like, and plays a role of suppressing atmospheric gas intrusion into the bag body 1 from the outside.

  The surface protective layer 4 and the inner surface protective layer 5 are located on the outer layer side of the gas barrier layer 6 among the layers of the outer jacket material 3, and prevent the outer shell material 3, particularly the gas barrier layer 6 from being damaged or torn from external forces. To fulfill.

  In the gas barrier layer 6 laminated on the outer layer side from the heat welding layer 7, the heat welding layer 7 bends along the shape of at least one recess in the thin portion 9 and the vicinity of the sealing portion 8, but the surface protective layer 4 When an external force is applied at the time of forming a recess by a plurality of films such as the inner protective layer 5, the stress is gradually reduced as the inner layer is formed, and the stress is less likely to concentrate locally. The generation of cracks in the gas barrier layer 6 laminated on the outer layer side is extremely difficult.

  As the surface protective layer 4 and the inner surface protective layer 5, conventionally known materials such as nylon film, polyethylene terephthalate film, polypropylene film can be used, and both the surface protective layer 4 and the inner surface protective layer 5 may be the same type or two or more types. You may use it repeatedly.

  In the present embodiment, the gas barrier layer 6 is a film obtained by depositing a metal atom such as aluminum or copper or a metal oxide such as alumina or silica on a polyethylene terephthalate film or an ethylene-vinyl alcohol copolymer film, or a metal atom or metal. A film or the like obtained by coating the surface on which the oxide is deposited can be used.

  The heat welding layer 7 welds the jacket materials 3 to each other and protects the gas barrier layer 6 from piercing from the inside of the bag body 1 by the filler 2 in addition to the role of maintaining the sealing performance inside the bag body 1. It plays a role.

  Conventionally known materials such as low-density polyethylene, linear low-density polyethylene, metallocene catalyst-based linear low-density polyethylene film, high-density polyethylene, and polypropylene can be used as the heat-welded layer 7, and one or more types can be stacked. May be used.

  The sealing portion 8 is configured by welding the heat welding layers 7 of the jacket material 3, and plays a role of blocking the inside and outside of the vacuum heat insulating material 1.

  The thin-walled portion 9 plays a role of maintaining the sealing performance of the bag body 1 by suppressing the permeation rate of the atmospheric gas that enters the bag body 1 from the end surface of the outer periphery of the jacket material 3 through the sealing portion 8.

  As described above, in the present embodiment, the thin-walled portion 9 is provided at the deepest position of the recess of the boundary surface between the heat-welded layer 7 and the gas barrier layer 6 in the sealing portion 8, and the boundary surface between the two layers. Since the difference is provided in the wave height of the concave portion of the gas barrier layer 6, the gas barrier layer 6 and the covering material 3 are hardly deteriorated or broken, and the atmospheric gas intrusion into the bag body 1 with time is suppressed.

  Moreover, when the bag body 1 is produced by the manufacturing method described above, the heat welding layer 7 is usually heated and compressed by the heat compression jig 10 constituted by the protrusions 11 as shown in FIG. Since the external force is also applied in the direction perpendicular to the tangent line of the protrusion 11, the resin of the heat welding layer 7 can easily flow toward both ends of the thin portion 9. Compared to the case where the flat portion is compressed, the temperature condition and pressure condition during manufacture when obtaining the same thickness of the thin portion 9 are relaxed, and the deterioration of the gas barrier layer 6 and the jacket material 3 is suppressed. The

  In other words, it becomes possible to further reduce the thickness of the thin portion 9 of the heat-welded layer 7 under the same molding conditions, and it becomes easy to suppress the amount of gas and moisture intrusion from the end surface of the outer periphery of the outer cover material 3.

  The bag body 1 according to the present embodiment is a bag body 1 in which the outer peripheral portions in the vicinity of the peripheral edges of the two outer cover materials 3 to be inserted and sealed with the filler 2 stored in the inner bag 2a are heat-welded. The covering material 3 is composed of a protective layer, a gas barrier layer 6, and a heat welding layer 7, and the protective layer is composed of a plurality of films such as a surface protective layer 4 and an internal protective layer 5, and the covering material. 3, when at least a part of the sealing portion 8 in which the outer peripheral portions are heat-welded to each other is cut by a plane perpendicular to the peripheral edge, the heat-welding layer 7 located in the sealing portion 8 has at least one A thin-walled portion 9 is formed at the deepest portion of the concave portion where the thickness of the heat-welded layer 7 is thinner than the peripheral portion of the deepest portion.

In the above-described configuration, first, when a cross section when cutting at least a part of the sealing portion 8 in which the peripheral portions of the jacket material 3 are thermally welded is cut by a plane perpendicular to the peripheral portion, the heat of the sealing portion 8 is obtained. By providing the thin-walled portion 9 where the thickness of the weld layer 7 is locally thin, the permeation cross-sectional area of gas and moisture entering from the end face of the outer periphery of the outer cover material 3 is reduced in the thin-walled portion 9 of the heat-welded layer 7. Further, the permeation resistance of gas and moisture is increased, and the permeation rate of gas and moisture is reduced. Therefore, the amount of gas and moisture that permeate with time is suppressed, and excellent heat insulation performance can be exhibited over a long period of time.

  In addition, when a cross-section when cutting at least a part of the sealing portion 8 where the peripheral portions of the jacket material 3 are heat-welded with each other is cut along a plane perpendicular to the peripheral portion, the protective layer is the surface protective layer 4 and the internal protection. Since it is composed of a plurality of films such as the layer 5, the gas barrier layer 6 laminated on the outer layer side of the heat welding layer 7 follows the shape of the heat welding layer 7 in the thin portion 9 of the sealing portion 8 and in the vicinity thereof. However, when an external force is applied when forming a recess by a plurality of films such as the surface protective layer 4 and the internal protective layer 5, the stress is gradually reduced as the inner layer is formed, and the stress is locally concentrated. It becomes difficult to generate cracks in the gas barrier layer 6 laminated on the outer layer side of the heat-welded layer 7.

  Further, in the thin-walled portion 9 of the heat-welded layer 7, the thickness of the heat-welded layer 7 is thinner than the peripheral portion, and the strength is reduced by the thickness reduction, but the thickness of the heat-welded layer 7 gradually increases along the recess. Since the strength (bending strength, etc.) of the sealing portion 8 continuously increases and decreases smoothly as the position changes, the stress is locally concentrated in the thin portion 9 of the heat-welded layer 7. It is difficult to occur, and the occurrence of cracks in the thin-walled portion 9 of the heat-welded layer 7 and the jacket material 3 in the vicinity thereof and the breakage of the sealing portion 8 are extremely unlikely to occur.

  By the above, in the thin part 9 of the heat welding layer 7 provided in the sealing part 8 and its vicinity, the crack 1 and the sealing part 8 breakage are hardly caused, and the bag body 1 maintaining excellent sealing performance for a long period of time. Can provide.

  Further, in the bag 1 of the present embodiment, the heat welding layer 7 of the sealing portion 8 has a boundary surface with the gas barrier layer 6 on both surfaces, and the wave height of the undulation on one boundary surface of the recess is the other of the recesses. It is larger than the wave height of the swell of the boundary surface.

  In the thin-walled portion 9 and the vicinity thereof, the covering material 3 (each layer 6, 5) on the outer layer side of the heat-welding layer 7 is distorted along the shape of the heat-welding layer 7 that is at least one recess. Under stress, the strength decreases.

  Therefore, by making the wave height of the undulation of the boundary surface of one of the concave portions (upper side in FIG. 2) larger than the wave height of the undulation surface of the other concave portion (lower side of FIG. 2), the wave height is relatively small. The decrease in strength of the outer cover material 3 on the boundary surface side having the waviness (lower side in FIG. 2) is caused by the reduction in the strength of the outer cover material 3 on the boundary surface side (upper side in FIG. 2) having waviness with a relatively large wave height. In comparison with the sealing portion 8 of the outer covering material 3, the outer covering material 3 (on the lower side in FIG. 2) supports the other outer covering material 3 (on the upper side in FIG. 2). The rigidity is maintained in the shape, and the occurrence of cracks and breakage of the sealing portion 8 when receiving external force are extremely difficult.

  When the thin-walled portion 9 is present, not only the thickness of the heat-welded layer 7 is thin and the strength is reduced, but also the strength of the jacket material 3 is reduced due to the distortion due to the deepest portion of the recess being located.

  In the present embodiment, the deepest portion of the concave portion on the heat welding layer 7 side of one boundary surface (upper side in FIG. 2) and the other boundary (lower side in FIG. 2) of the concave portion Since the deepest portion of the concave portion on the surface of the surface is not opposed to the deepest portion, a decrease in strength of the sealing portion 8 where the deepest portion of the concave portion is located is suppressed, and the sealing portion 8 has an external force. Scratches and breakage are less likely to occur. At the same time, the effect of suppressing the deterioration of the gas barrier layer 6 in the recesses is further enhanced.

Moreover, it is preferable that the sealing part 8 has at least two thin parts 9 as in the example shown in FIG.

  In the thin-walled portion 9, the thickness of the heat-welded layer 7 is thinner than that of other portions of the sealing portion 8, and the sealing strength of the heat-welding is reduced. When the workpiece 3 is heat-welded, there is a concern that a heat-welding failure occurs in the thin portion 9.

  Since there is no resin at the location where the thermal welding failure occurs, the effect of suppressing gas intrusion decreases. As a countermeasure, by providing at least two or more thin-walled portions 9, the influence of gas and moisture penetration promotion into the bag body 1 due to poor heat welding is mitigated.

  In particular, when a thin material such as glass fiber is used, there are many cases where the filler 2 material sandwiched during the heat welding as an interspersed material is deformed by heating and a through hole is formed in the thin portion 9. For this reason, the effect (of the present embodiment) of the present invention becomes more remarkable.

  Moreover, in the thin part 9, although the intensity | strength of the jacket material 3 becomes lower than a surrounding part and there is a concern about the load concentration at the time of receiving external force, the load of external force is due to the presence of a plurality of thin parts 9. Are dispersed, and the occurrence of cracks in the thin-walled portion 9 and the breakage of the sealing portion 8 are extremely difficult to occur.

  Further, when the plurality of thin portions 9 are provided, the same effect can be obtained even if the thickness of the thermal welding layer 7 in the thin portion 9 is increased as compared with the case where only one thin portion 9 is provided. 9 is reduced, and the risk of cracks in the thin-walled portion 9 and breakage of the sealing portion 8 is reduced.

  Moreover, in this Embodiment, since the filling 2 is accommodated in the inner bag 2a and forms the triangular wave-shaped notch along the peripheral part of the jacket material 3, tearing force more than predetermined is given. If applied, stress concentration will occur, the outer jacket material 3 can be easily torn, and the filling 2 stored in the inner bag 2a inside the outer jacket material 3 can be taken out in a state where it can be easily reused. It can be reused for vacuum insulation.

  In the present embodiment, the sealing portion 8 having the thin portion 9 has three sides, but may be provided on four sides of the entire circumference of the sealing portion 8.

  In addition, the thickness of the heat welding layer 7 in each thin part 9 does not need to be the same.

  In addition, in this Embodiment, although the thin part 9 is orthogonal, the thin part 9 does not need to cross | intersect.

  In addition, the width | variety of the recessed part of the interface located in each thin part 9 does not need to be the same, and the metal foil and film used as the gas barrier layer 6 should just have a width | variety which does not deteriorate.

  In addition, the space | interval of the thin part 9 is not specified in particular, and as shown in FIG. 5, the space | interval of the recessed parts which a boundary surface does not need to be equal.

  In the present embodiment, the position of the thin-walled portion 9 is not particularly specified, but the position of the concave portion on the boundary surface exists at the boundary between the sealing portion 8 of the jacket material 3 and the portion that is not. In such a case, the resin on one side of the thin-walled portion 9 is not sufficiently heated, and the fluidity of the resin is poor.

The bag body 1 according to the present embodiment is a bag body 1 for filling sealing in which the peripheral edges of two outer cover materials 3 or the outer peripheral portions in the vicinity of the peripheral edges are thermally welded to each other. Sealing comprising a laminate film laminated in the order of a surface protective layer 4, an internal protective layer 5, a gas barrier layer 6, and a heat welding layer 7 from the inside to the inside, and the outer peripheral parts of the jacket material 3 being heat welded to each other When at least a part of the portion 8 is cut by a plane perpendicular to the periphery of the outer cover material 3, the heat-welded layer 7 located in the sealing portion 8 has at least one concave portion when viewed in a cross section. A thin-walled portion 9 is formed in the deepest portion of the recess where the thickness of the heat-welded layer 7 is thinner than the peripheral portion of the deepest portion, and a notch 3a or a cut is formed in at least a part of the peripheral portion of the jacket material 3 The bag 1 is sealed in a state in which the filling 2 is stored in the inner bag 2a.

  In the above-described configuration, first, when a cross-section when cutting at least a part of the sealing portion 8 in which the outer peripheral portions of the jacket material 3 are thermally welded is cut by a plane perpendicular to the peripheral edge, the position is located in the sealing portion 8. By providing the thin-walled portion 9 where the thickness of the heat-welding layer 7 is locally thin, in the thin-walled portion 9 of the heat-welding layer 7, the permeation area of gas and moisture entering from the end surface of the outer periphery of the outer cover material 3 is reduced. Further, the permeation resistance of gas and moisture is increased, and the permeation rate of gas and moisture is reduced. Therefore, the amount of gas and moisture that permeate with time is suppressed, and excellent sealing performance can be exhibited over a long period of time.

  Further, when the cross section when the outer peripheral portion of the outer cover material 3 is cut by a plane perpendicular to the peripheral edge is cut at least part of the sealing portion 8 where the outer peripheral portions are thermally welded, the protective layer is the surface protective layer 4 and the internal protection. Since it is composed of a plurality of films such as the layer 5, the heat welding layer 7 bends along the shape of at least one recess in the thin portion 9 of the sealing portion 8 and its vicinity. When an external force is applied when forming a recess by a plurality of films such as the layer 5, the stress is gradually reduced as the inner layer is formed, and the stress is less likely to be concentrated locally. Deterioration of the laminated gas barrier layer 6 is extremely difficult to occur.

  Further, in the thin-walled portion 9 of the heat-welded layer 7, the thickness of the heat-welded layer 7 is thinner than the peripheral portion, and the strength is reduced by the thickness reduction, but the thickness of the heat-welded layer 7 is the heating used for forming the recess. As the strength of the sealing portion 8 increases or decreases continuously and smoothly along with the protrusion 11 in the compression jig 10, the stress locally increases in the thin portion 8 of the heat-welded layer 7. Are less likely to concentrate, and the gas barrier layer is not easily deteriorated or the sealing portion 8 is not easily broken in the thin-walled portion 9 of the heat-welded layer 7 and the jacket material 3 in the vicinity thereof.

  Furthermore, since the notch 3a or the notch is formed in at least a part of the peripheral edge portion of the jacket material 3, and the filler 2 is sealed in a state of being housed in the inner bag 2a, the jacket material 3 can be easily The filling 2 can be easily taken out, and when the filling 2 inside the outer jacket material 3 is taken out, the filling 2 is protected by the inner bag 2a, and the filling 2 in the inner bag 2a is removed. It can be prevented from being damaged.

  And when the core material which has a fine space | gap as the filling 2 is put in the bag 1 in the state which carried out the pressure reduction sealing in the bag 1, in order to maintain the heat insulation performance excellent over the long term, and to recycle a vacuum heat insulating material In addition, when the core material is taken out, the core material can be easily separated and the core material is protected by the inner bag 2a, so that the core material in the inner bag 2a can be prevented from being damaged, and the core material is left as it is. Alternatively, only the inner bag 2a can be newly changed and reused as the core material of the vacuum heat insulating material, and the regenerative energy can be reduced.

As described above, excellent sealing performance can be maintained over a long period of time, in which the gas barrier layer 6 is hardly deteriorated and the sealing portion 8 is not easily broken at the thin portion 9 of the heat welding layer 7 provided in the sealing portion 8 and the vicinity thereof. When the core material having fine voids as the filler 2 is sealed under reduced pressure in the inner bag 2a, excellent heat insulation performance can be maintained over a long period of time, the core material can be easily separated, and the core material can be left as it is. Or a bag body 1 as a vacuum heat insulating material excellent in recyclability that can be reused as a core material of a vacuum heat insulating material by changing only the inner bag 2a, and a vacuum heat insulating material using the same Can be provided.

  Hereinafter, the material structure and the effect of the jacket 3 of the bag body 1 according to the present invention will be described using examples.

Example 1
In Embodiment 1, a linear low density polyethylene film (LLDPE) having a thickness of 50 μm as the heat-welding layer 7, a thickness of 24 μm as the gas barrier layer 6, and a nylon film (Ny) having a thickness of 15 μm as the surface protective layer 4, The inner protective layer 5 is composed of a jacket material 3 formed by laminating a nylon film (Ny) having a thickness of 25 μm as two protective layers, and a filler 2 made of glass fibers (in a state of being housed in the inner bag 2a). A bag 1 was prepared.

  On the peripheral side (outer peripheral portion) of the jacket material 3, there is a sealing portion 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together, and three of the four sides of the sealing portion 8. Four groove-shaped thin portions 9 parallel to the peripheral edge are formed in the direction perpendicular to the peripheral edge, and one of the thin-walled portions 9 (in FIG. 3, the upper aluminum foil 6 and the heat welding layer 7 are arranged). The width at the deepest part of the concave portion of the boundary surface is 1.5 mm, each wave height of the undulation of the boundary surface (in FIG. 3 between the upper aluminum foil 6 and the thermal welding layer 7) is 0.2 mm, and The space | interval with the deepest part of an adjacent recessed part was 1.5 mm. Moreover, the maximum wave height of the recessed part which the other interface (in FIG. 3 with the lower aluminum foil 6 and the heat welding layer 7) has was 0.05 mm (refer FIG. 3).

  At this time, the seal width (the width for thermally welding the jacket materials 3) was 20 mm, and the thickness of the thin portion 9 was 10 μm.

  Here, the thickness of the thin-walled portion 9 is 200 times as long as at least a part of the sealing portion 8 in which the outer peripheral portions of the outer cover material 3 are thermally welded to each other by a microtome on a plane perpendicular to the peripheral edge. The magnification was measured with a microscope.

  In the above, the crack generation | occurrence | production was not confirmed in the aluminum foil 6 in the sealing part 8. FIG.

  In Example 1, since the nylon film was laminated as a two-layer protective layer, it was confirmed that the concave shape of each layer in the thin-walled portion 9 was gradually relaxed as it became the inner layer, and stress was concentrated locally. The effect of the present invention (Embodiment 1), which is less likely to occur, appears more remarkably.

(Example 2)
In Embodiment 1, a linear low density polyethylene film (LLDPE) having a thickness of 50 μm as the heat-welding layer 7, a thickness of 24 μm as the gas barrier layer 6, and a nylon film (Ny) having a thickness of 15 μm as the surface protective layer 4, Consists of an outer cover material 3 formed by laminating a polyethylene terephthalate film (PET) having a thickness of 25 μm as a protective layer of two layers as the inner protective layer 5 and a filler 2 made of glass fiber (contained in the inner bag 2a). A bag 1 was prepared.

On the peripheral side (outer peripheral portion) of the jacket material 3, there is a sealing portion 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together, and three of the four sides of the sealing portion 8. Four groove-shaped thin portions 9 parallel to the peripheral edge are formed in a direction perpendicular to the peripheral edge, and one of the thin wall portions 9 (in FIG. 3, the upper gas barrier layer 6 and the thermal welding layer 7 are arranged). The width at the deepest part of the concave portion of the boundary surface is 1.5 mm, each wave height of the waviness of the boundary surface (in FIG. 3 between the upper gas barrier layer 6 and the thermal welding layer 7) is 0.2 mm, and The space | interval with the deepest part of an adjacent recessed part was 1.5 mm. Further, the maximum wave height of the concave portion of the other interface (in FIG. 3, the lower gas barrier layer 6 and the heat-welded layer 7) was 0.05 mm (see FIG. 3).

  At this time, the seal width (the width for thermally welding the jacket materials 3) was 20 mm, and the thickness of the thin portion 9 was 10 μm.

  Here, the thickness of the thin-walled portion 9 is such that at least a part of the sealing portion in which the outer peripheral portions of the outer cover material 3 are heat-welded to each other by a microtome is cut by a plane perpendicular to the peripheral edge, 200 times Measured with a microscope at magnification.

  In the above, no deterioration of the gas barrier layer 6 was confirmed in the sealing portion 8.

(Example 3)
In Embodiment 1, a high-density polyethylene film (HDPE) having a thickness of 50 μm is used as the heat welding layer 7, a 24 μm thickness is used as the gas barrier layer 6, a nylon film (Ny) having a thickness of 15 μm is used as the surface protective layer 4, and an internal protective layer 5 is a bag body composed of a jacket material 3 formed by laminating a 25 μm-thick nylon film (Ny) as a two-layer protective layer, and a filler 2 made of glass fibers (in a state of being housed in the inner bag 2a). 1 was produced.

  On the peripheral side (outer peripheral portion) of the jacket material 3, there is a sealing portion 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together, and three of the four sides of the sealing portion 8. Four groove-shaped thin portions 9 parallel to the peripheral edge are formed in a direction perpendicular to the peripheral edge, and one of the thin wall portions 9 (in FIG. 3, the upper gas barrier layer 6 and the thermal welding layer 7 are arranged). The width at the deepest part of the concave portion of the boundary surface is 1.5 mm, each wave height of the waviness of the boundary surface (in FIG. 3 between the upper gas barrier layer 6 and the thermal welding layer 7) is 0.2 mm, and The space | interval with the deepest part of an adjacent recessed part was 1.5 mm. Further, the maximum wave height of the concave portion of the other interface (in FIG. 3, the lower gas barrier layer 6 and the heat-welded layer 7) was 0.05 mm (see FIG. 3).

  At this time, the seal width (the width for thermally welding the jacket materials 3) was 20 mm, and the thickness of the thin portion 9 was 10 μm.

  Here, the thickness of the thin-walled portion 9 is 200 times as long as at least a part of the sealing portion 8 in which the outer peripheral portions of the outer cover material 3 are thermally welded to each other by a microtome on a plane perpendicular to the peripheral edge. The magnification was measured with a microscope.

  In the above, no deterioration of the gas barrier layer 6 was confirmed in the sealing portion 8.

(Embodiment 2)
FIG. 6 shows a cross-sectional view of the vacuum heat insulating material in Embodiment 2 of the present invention.

  In FIG. 6, the vacuum heat insulating material 12 includes a core material 13, an adsorbent 14 disposed in the core material 13, an inner bag 13 a for storing the core material 13, and two rectangular outer sheets cut into the same dimensions. The core material 13 and the adsorbent 14 that are made of the material 3 and are housed in the inner bag 13 a between the two outer material materials 3 are sealed under reduced pressure, and in the vicinity of the periphery of the two outer material materials 3 that cover the core material 13. The outer peripheries are thermally welded.

  The two jacket materials 3 are laminated in the order of the surface protective layer 4, the internal protective layer 5, the gas barrier layer 6, and the thermal welding layer 7 from the outer layer side to the inner layer side in the same form as in the first embodiment. Laminated film. Further, on the peripheral side (outer peripheral part) of the jacket material 3, there is a sealing part 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together. The thin portion 9 is provided on at least three sides.

  Here, the shape of the sealing portion 8 around the thin portion 9 is the same as that in the first embodiment.

  In FIG. 3, there is a difference in the wave height of the concave portion of the boundary surface between the thermal welding layer 7 and the gas barrier layer 6, and only the deepest portion of the concave portion provided in the boundary surface having the concave portion having a large wave height. Is located in the thin portion 9.

  Next, in the present embodiment, an example of a method for manufacturing the vacuum heat insulating material 12 of the present embodiment shown in FIG. 6 will be described.

  First, it arrange | positions so that the heat welding layers 7 of the two jacket materials 3 may oppose, and heat-welds the three sides of the jacket material 3 into a bag shape. At the time of this thermal welding, heat compression is performed so that the two outer cover materials 3 are sandwiched between a metal heating and compression jig 10 (see FIG. 4) and a silicon rubber heater (not shown), and the sealing of the shape shown in FIG. A stop 8 is formed. Thereafter, the core material 13 and the adsorbent 14 are accommodated in the inner bag 13a and then inserted into the bag, and the opening of the bag of the outer jacket material 3 is thermally welded while reducing the pressure inside the bag to about 200 Pa or less. The vacuum heat insulating material 12 is obtained by sealing.

  In the example shown in FIG. 3, the sealing portion 8 has at least two thin portions 9 (four).

  About the vacuum heat insulating material 12 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the core material 13 plays a role of forming a fine space as an aggregate of the vacuum heat insulating material 12, forms a heat insulating portion of the vacuum heat insulating material 12 after evacuation, and is made of glass fiber.

  The adsorbent 14 plays a role in adsorbing and removing residual gas components released into the vacuum heat insulating material 12 from the fine gaps of the core material 13 after vacuum packaging, and moisture and gas entering the vacuum heat insulating material 12. .

  The outer covering material 3 has the same form as that of the first embodiment, and plays a role of suppressing atmospheric gas intrusion into the vacuum heat insulating material 1 from the outside. Therefore, in the present embodiment, the passage of atmospheric gas into the vacuum heat insulating material 12 over time is suppressed, and excellent heat insulating performance can be exhibited over a long period of time.

  Further, since the protective layer is composed of a plurality of films such as the surface protective layer 4 and the internal protective layer 5, when an external force is applied at the time of forming the recess, the stress is gradually reduced as it becomes the inner layer, and locally It becomes difficult for stress to concentrate, and the occurrence of deterioration of the gas barrier layer 6 laminated on the outer layer side from the heat welding layer 7 becomes extremely difficult.

  Furthermore, in the thin part 9 of the heat welding layer 7, stress concentrates locally in the thin part 9 of the heat welding layer 7 as the thickness of the heat welding layer 7 gradually increases and decreases along the concave portion. This is unlikely to occur, and the occurrence of cracks in the thin-walled portion 9 of the heat-welded layer 7 and the jacket material 3 in the vicinity thereof and the breakage of the sealing portion 8 are extremely difficult to occur.

  By the above, the vacuum heat insulating material which maintains the heat insulation performance excellent in the long term in which the crack generation | occurrence | production and the fracture | rupture of the sealing part 8 do not occur easily in the thin part 9 of the heat welding layer 7 provided in the sealing part 8 and its vicinity. 12 can be provided.

The vacuum heat insulating material 12 according to the present embodiment is a vacuum heat insulating material 12 in which a core material 13 having a fine gap as a filling material is sealed under reduced pressure in a bag body 1 having the same configuration as that of the first embodiment. Therefore, it is possible to provide a vacuum heat insulating material 12 that can maintain excellent heat insulating performance and can easily separate the core material 13 and is excellent in recyclability.

  Hereinafter, the material structure and the effect of the jacket 3 of the vacuum heat insulating material 12 in the present invention will be described using examples.

Example 4
In the second embodiment, a linear low density polyethylene film (LLDPE) having a thickness of 50 μm as the heat welding layer 7, a thickness of 24 μm as the gas barrier layer 6, and a nylon film (Ny) having a thickness of 15 μm as the surface protective layer 4, As the internal protective layer 5, a jacket material 3 formed by laminating a nylon film (Ny) having a thickness of 25 μm as two protective layers, a core material 13 made of glass fiber, an adsorbent 14 made of calcium oxide, and a core material The vacuum heat insulating material 12 comprised from 13 and the inner bag 13a which accommodates the adsorption agent 14 was produced.

  On the peripheral side (outer peripheral portion) of the jacket material 3, there is a sealing portion 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together, and three of the four sides of the sealing portion 8. Four groove-shaped thin portions 9 parallel to the peripheral edge are formed in a direction perpendicular to the peripheral edge, and one of the thin wall portions 9 (in FIG. 3, the upper gas barrier layer 6 and the thermal welding layer 7 are arranged). The width at the deepest part of the concave portion of the boundary surface is 1.5 mm, each wave height of the waviness of the boundary surface (in FIG. 3 between the upper gas barrier layer 6 and the thermal welding layer 7) is 0.2 mm, and The space | interval with the deepest part of an adjacent recessed part was 1.5 mm. Further, the maximum wave height of the concave portion of the other interface (in FIG. 3, the lower gas barrier layer 6 and the heat-welded layer 7) was 0.05 mm (see FIG. 3).

At this time, when the seal width (width for thermally welding the jacket materials 3) is 20 mm and the thickness of the thin portion 9 is 10 μm, the sealing portion 8 is removed from the end surface of the outer periphery of the jacket material 3 of the vacuum heat insulating material 12. The amount of atmospheric gas entering through was 7.8 × 10 ⁻¹⁵ mol / m ² / s / Pa.

  Here, the thickness of the thin-walled portion 9 is 200 times as long as at least a part of the sealing portion 8 in which the outer peripheral portions of the outer cover material 3 are thermally welded to each other by a microtome on a plane perpendicular to the peripheral edge. The magnification was measured with a microscope.

  In the above, no deterioration of the gas barrier layer 6 was confirmed in the sealing portion 8.

  In Example 4, since the nylon film was laminated as a two-layer protective layer as in Embodiment 1, it was confirmed that the concave shape of each layer in the thin-walled portion 9 was gradually relaxed as it became an inner layer, and locally The effect of the present invention (Embodiment 2), in which stress concentration is less likely to occur, is more noticeable.

(Example 5)
In the second embodiment, a linear low density polyethylene film (LLDPE) having a thickness of 50 μm as the heat welding layer 7, a thickness of 24 μm as the gas barrier layer 6, and a nylon film (Ny) having a thickness of 15 μm as the surface protective layer 4, As the inner protective layer 5, a jacket material 3 formed by laminating a polyethylene terephthalate film (PET) having a thickness of 25 μm as two protective layers, a core material 13 made of glass fiber, an adsorbent 14 made of calcium oxide, and a core The vacuum heat insulating material 12 comprised from the inner bag 13a which accommodates the material 13 and the adsorption agent 14 was produced.

On the peripheral side (outer peripheral portion) of the jacket material 3, there is a sealing portion 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together, and three of the four sides of the sealing portion 8. Four groove-shaped thin portions 9 parallel to the peripheral edge are formed in a direction perpendicular to the peripheral edge, and one of the thin wall portions 9 (in FIG. 3, the upper gas barrier layer 6 and the thermal welding layer 7 are arranged). The width at the deepest part of the concave portion of the boundary surface is 1.5 mm, each wave height of the waviness of the boundary surface (in FIG. 3 between the upper gas barrier layer 6 and the thermal welding layer 7) is 0.2 mm, and The space | interval with the deepest part of an adjacent recessed part was 1.5 mm. Further, the maximum wave height of the concave portion of the other interface (in FIG. 3, the lower gas barrier layer 6 and the heat-welded layer 7) was 0.05 mm (see FIG. 3).

At this time, when the seal width (width for thermally welding the jacket materials 3) is 20 mm and the thickness of the thin portion 9 is 10 μm, the sealing portion 8 is removed from the end surface of the outer periphery of the jacket material 3 of the vacuum heat insulating material 12. The amount of atmospheric gas entering through was 8.1 × 10 ⁻¹⁵ mol / m ² / s / Pa.

  Here, the thickness of the thin-walled portion 9 is 200 times as long as at least a part of the sealing portion 8 in which the outer peripheral portions of the outer cover material 3 are thermally welded to each other by a microtome on a plane perpendicular to the peripheral edge. The magnification was measured with a microscope.

  In the above, no deterioration of the gas barrier layer 6 was confirmed in the sealing portion 8.

(Example 6)
In Embodiment 2, a high-density polyethylene film (HDPE) having a thickness of 50 μm is used as the thermal welding layer 7, a thickness of 24 μm is used as the gas barrier layer 6, and a nylon film (Ny) having a thickness of 15 μm is used as the surface protective layer 4. 5, a jacket material 3 formed by laminating a nylon film (Ny) having a thickness of 25 μm as two protective layers, a core material 13 made of glass fiber, an adsorbent 14 made of calcium oxide, and a core material 13 and adsorbing The vacuum heat insulating material 12 comprised from the inner bag 13a which accommodates the agent 14 was produced.

  On the peripheral side (outer peripheral portion) of the jacket material 3, there is a sealing portion 8 in which the heat-welding layers 7 of the jacket material 3 are melted and bonded together, and three of the four sides of the sealing portion 8. Four groove-shaped thin portions 9 parallel to the peripheral edge are formed in a direction perpendicular to the peripheral edge, and one of the thin wall portions 9 (in FIG. 3, the upper gas barrier layer 6 and the thermal welding layer 7 are arranged). The width at the deepest part of the concave portion of the boundary surface is 1.5 mm, each wave height of the waviness of the boundary surface (in FIG. 3 between the upper gas barrier layer 6 and the thermal welding layer 7) is 0.2 mm, and The space | interval with the deepest part of an adjacent recessed part was 1.5 mm. Further, the maximum wave height of the concave portion of the other interface (in FIG. 3, the lower gas barrier layer 6 and the heat-welded layer 7) was 0.05 mm (see FIG. 3).

At this time, when the seal width (width for thermally welding the jacket materials 3) is 20 mm and the thickness of the thin portion 9 is 10 μm, the sealing portion 8 is removed from the end surface of the outer periphery of the jacket material 3 of the vacuum heat insulating material 12. The amount of atmospheric gas entering through was 1.5 × 10 ⁻¹⁵ mol / m ² / s / Pa.

  Here, the thickness of the thin-walled portion 9 is 200 times as long as at least a part of the sealing portion 8 in which the outer peripheral portions of the outer cover material 3 are thermally welded to each other by a microtome on a plane perpendicular to the peripheral edge. The magnification was measured with a microscope.

  In the above, no deterioration of the gas barrier layer 6 was confirmed in the sealing portion 8.

  The bag according to the present invention has a sealing performance that can withstand long-term use, and is used in daily life such as confectionery, beverages, retort foods, liquid or solid chemicals, detergents, bathing agents, shampoos, etc. It can also be applied to general-purpose sealed bags.

  In addition, the vacuum heat insulating material according to the present invention has heat insulating performance that can withstand long-term use, and is easy to reuse the core material, such as a refrigerator heat insulating material, a vending machine, and a building heat insulating material. It can also be applied to materials, automotive insulation, and cold storage boxes.

DESCRIPTION OF SYMBOLS 1 Bag body 2 Filling material 2a Inner bag 3 Cover material 3a Notch 4 Surface protective layer 5 Internal protective layer 6 Gas barrier layer 7 Thermal welding layer 8 Sealing part 9 Thin part 12 Vacuum heat insulating material 13 Core material 13a Inner bag

Claims (2)

A bag body for sealing a filling in which the outer peripheral portions of two outer jacket materials or the outer peripheral portions in the vicinity of the outer periphery are thermally welded to each other, wherein the outer jacket material is directed from the outside toward the inside. A laminate film laminated in the order of a gas layer, a gas barrier layer, and a heat-welded layer, and at least a part of the sealing portion in which the outer peripheral portions of the jacket material are heat-welded to each other is cut along a plane perpendicular to the peripheral edge 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 at the deepest portion of the concave portion is larger than the peripheral portion of the deepest portion. A bag body in which a thin thin part is formed, a cutout or a cut is formed in at least a part of a peripheral part of the jacket material, and the filling is sealed in a state of being housed in an inner bag. The vacuum heat insulating material which carried out the pressure reduction sealing in the state in which the core material which has a fine space | gap as a filling was accommodated in the inner bag in the bag body of Claim 1.