JP5056269B2 - Vacuum insulation - Google Patents

Description

  The present invention relates to a high performance vacuum heat insulating material.

  In recent years, expectations for industrial technology that requires high vacuum are increasing. For example, energy saving is strongly desired from the viewpoint of preventing global warming, and energy saving is an urgent issue for household appliances. In particular, a heat insulating material having excellent heat insulating performance is required from the viewpoint of efficiently using heat in a heat and cold insulation device such as a refrigerator, a freezer, and a vending machine.

  As general heat insulating materials, fiber materials such as glass wool and foams such as urethane foam are used. However, in order to improve the heat insulation performance of these heat insulating materials, it is necessary to increase the thickness of the heat insulating material, and there is a limit to the space that can be filled with the heat insulating material, so when space saving and effective use of the space are necessary It cannot be applied.

  Therefore, vacuum heat insulating materials have been proposed as high performance heat insulating materials. This is a heat insulator in which a core material serving as a spacer is inserted into a jacket material having gas barrier properties and the inside is decompressed and sealed.

  By increasing the degree of vacuum inside the vacuum heat insulating material, high-performance heat insulating performance can be obtained, but the gas existing inside the vacuum heat insulating material is roughly divided into the following three types. One is the gas that cannot be evacuated during the vacuum insulation material preparation, and the other is the gas generated from the core material and the jacket material after being sealed under reduced pressure (adsorbed on the core material and the jacket material). The remaining gas is a gas that passes through the jacket material and enters from the outside.

  In order to adsorb these gases, a method of filling a gas adsorbent has been devised. The gas adsorbent needs to be stored in a non-contact environment with an external atmosphere in order to prevent deterioration during storage. On the other hand, when filled in the vacuum heat insulating material, it is necessary to communicate with the atmosphere inside the vacuum heat insulating material and adsorb gas. A method for communicating between the gas adsorbent and the inside of the vacuum heat insulating material has also been devised (see Patent Document 1).

In Patent Document 1, a gas adsorbent and a magnetic material bag sealed under reduced pressure in a sealing bag are set in advance in a jacket material, the bag is moved with a permanent magnet after vacuum sealing, and a through hole is formed in the sealing bag. It is what is generated. As a result, the gas adsorbing material and the inside of the jacket material communicate with each other, and gas can be adsorbed.
Japanese Patent Publication No. 4-51752

  However, in the above conventional configuration, powder is used as the core material. On the other hand, man-hours are required to connect the interior of the packaging material and the interior of the jacket material. Generally, the vacuum heat insulating material of the powder-based core material is less dependent on the pressure inside the jacket material. Therefore, even if gas enters from the outside, the increase in thermal conductivity is small. On the other hand, since the inside of the packaging material and the inside of the jacket material are communicated, the cost increases depending on the number of steps. For these reasons, there has been a problem that the effect of reducing thermal conductivity is small with respect to an increase in cost. Moreover, since the process using a gutter was required when communicating, there existed a subject that the thickness of a vacuum heat insulating material increased and a load was applied to the jacket material.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a vacuum heat insulating material that has a large effect of reducing thermal conductivity by solving the harmful effects caused by the installation of an air adsorbent.

  In order to achieve the above object, the vacuum heat insulating material of the present invention includes a core material containing at least a fiber material, a gas adsorbing material vacuum-sealed in a bag made of a gas barrier packaging material, and an external force. A member having a protrusion capable of opening a hole in the packaging material is covered with a jacket material having excellent gas barrier properties, and the inside of the jacket material is vacuum-sealed. The projection is deformed when pushed to the gas adsorbing material side through the material, and the projection is configured to open a hole in the packaging material so as to communicate the inside of the packaging material with the inside of the jacket material. It is.

  In other words, the fiber core material and the gas adsorbent have a lower thermal conductivity than that of the powder-based core material under low pressure, that is, excellent heat insulation properties. Communication within the jacket material is performed without increasing man-hours.

  By doing in this way, the outstanding heat insulation performance under the low pressure of a fiber type core material is maintained. Further, since the number of man-hours is not increased, an increase in cost can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding heat insulation in the low pressure of a fiber type core material is maintained, the increase in cost by installation of a gas adsorbent is suppressed, and the vacuum heat insulating material excellent in cost effectiveness can be obtained.

According to the present invention, a core material including at least a fiber material, a gas adsorbent vacuum-sealed in a bag made of a gas barrier packaging material, and a hole can be opened in the packaging material when an external force is applied. A member having a protrusion is covered with a jacket material having excellent gas barrier properties, and the inside of the jacket material is vacuum-sealed, and the member is pushed to the gas adsorbent side through the jacket material. In such a case, the projection is deformed so that a hole is formed in the packaging material so that the inside of the packaging material and the inside of the jacket material are communicated.

  The heat conductivity of the vacuum heat insulating material produced using the core material containing the fiber material is smaller in the low pressure region than the heat conductivity of the vacuum heat insulating material produced using the core material made only of the powder material, Large in high pressure range. Therefore, it is important for the vacuum heat insulating material produced using the core material containing the fiber material to keep the pressure inside the jacket material low.

  Since the vacuum heat insulating material of the present invention has a gas adsorbing material in the jacket material, the pressure inside the jacket material is kept low, and the thermal conductivity of the vacuum heat insulating material using the core material containing the fiber material Is kept low.

  Here, the core material including the fiber material includes fibers of 1% to 100% with respect to the weight of the core material, and may be a composite other than the fiber material and the fiber material.

The packaging material excellent in gas barrier properties is a film or sheet-like member that is difficult to gas and can be produced. For example, a film in which a polypropylene film, an aluminum foil, and a low density polyethylene are laminated in this order can be used. Further, the bag encloses the gas adsorbing material to make it independent from the surrounding space, and includes a bag heat-sealed in four directions, a pillow bag, a gusset bag, and the like. Further, the gas permeability is preferably 10 ⁴ [cm ³ / m ² · day · atm] or less, and more preferably 10 ³ [cm ³ / m ² · day · atm] or less.

  The member having a protrusion has a portion having a remarkably large curvature as compared with the surrounding curvature. Since the portion having a large curvature receives the same force in a smaller area, the force applied per unit area increases. Therefore, when a portion having a large curvature is pressed against the packaging material, a through hole is likely to be formed in the packaging material.

The jacket material having excellent gas barrier properties is a material that is independent of the surrounding space by wrapping a core material, a wrapping material, a gas adsorbing material, and a member having a protrusion. Further, the gas permeability is preferably 10 ⁴ [cm ³ / m ² · day · atm] or less, and more preferably 10 ³ [cm ³ / m ² · day · atm] or less.

  The method of making a hole is made by a protrusion contacting a jacket material.

  The term “communication” means that a space separated between the inside of the packaging material and the outside of the packaging material is made into a continuous space.

In the present invention, the core material is composed of a fiber assembly.

  Generally, the thermal conductivity of the vacuum heat insulating material is determined by the sum of the heat conduction by the core material and the heat conduction by the residual gas in the jacket material. For example, when the core material contains powder, the mean free path of the gas existing inside the core material is short, so that the thermal conductivity by the gas is very small, and the heat conduction by the core material is dominant.

  On the other hand, when the core material is a fiber, the thermal conductivity of the core material is very small because there are few contact points between the fibers, but since the mean free path of the gas is large, the heat conduction by the gas with a slight pressure increase The rate becomes dominant.

  Therefore, when the core material is composed only of fibers, such an effect is large, and therefore, in the fiber core material, keeping the inside of the jacket material at a low pressure is very effective for reducing the thermal conductivity of the vacuum heat insulating material. It becomes a means.

  Here, the fiber aggregate is an aggregate composed only of fibers, and may be molded with a binder, acid, heat, or the like.

In the present invention, the communication between the inside of the packaging material and the inside of the jacket material is made by the contact between the projection and the packaging material.

  Since the stress is concentrated by the protrusions and the inside of the packaging material and the inside of the covering material are communicated with each other, the strength of the packaging material can be increased so as not to communicate with other than the projections. For this reason, it can prevent the damage at the time of handling a packaging material until it applies to a vacuum heat insulating material, and can improve a yield.

  Here, the contact is a state in which there is no other object or space between two or more objects. When the projection comes into contact with the packaging material, the piercing force, the cutting force, etc. work, Including cracking in the material.

  The breakage refers to an unintentional communication between the inside of the packaging material and the outside of the packaging material before being applied to the vacuum heat insulating material.

Further, according to the present invention, the contact between the protrusion and the packaging material is caused by the difference between the atmospheric pressure and the pressure inside the jacket material.

  It is desirable that the contact between the protrusion and the packaging material is made without going through a special process in the production process of the vacuum heat insulating material.

  The vacuum heat insulating material is manufactured in a process in which a core material or the like is inserted into the jacket material, the pressure is reduced inside the vacuum chamber, and the atmosphere is released after sealing. The pressure in the outer cover material of the vacuum heat insulating material is lower than that of the outer cover material. For this reason, the inside of a vacuum heat insulating material is compressed by this pressure difference. If the relative positions of the protrusion and the packaging material are set so as to contact with each other by this pressure difference, they are automatically pressed by the application of atmospheric pressure, and a through hole is generated. As a result, the step of communicating the inside of the packaging material and the inside of the jacket material can be omitted, and the cost for producing the vacuum heat insulating material can be reduced.

Further, according to the present invention , a space is secured between the projection and the packaging material when pressure is not applied, and the projection contacts the packaging material when pressure is applied.

  When pressure is not applied, there is a space between the protrusion and the packaging material, so there is no through hole in the packaging material, and the independence of the space inside the packaging material is maintained, and the gas adsorbed in the packaging material is absorbed. The material can be less degraded.

Further, according to the present invention, the member having the protrusions is close to a flat plate shape by deformation when pressure is applied.

  Since the vacuum heat insulating material is superior in heat insulating performance around the same thickness as other heat insulating materials, the thickness used for obtaining the same heat insulating performance can be reduced. This is because the thickness required to obtain the same heat insulating property with heat insulating materials having different thermal conductivities is proportional to the thermal conductivity of each heat insulating material. On the other hand, the thickness of the vacuum heat insulating material is approximately the sum of the thickness of the core material under one atmospheric pressure, the adsorbing material, and the thickness of the mechanism for exerting the characteristics of the adsorbing material.

  Here, the mechanism for exerting the characteristics of the adsorbent is a member having a packaging material for preventing contact with the atmosphere when the adsorbent is not used, and a projection for communicating the inside of the packaging material with the inside of the jacket material. It is. Therefore, if the member having the protrusions is thinned, the vacuum heat insulating material can be thinned.

  The member having the protrusions has a small contribution to the increase in the thickness of the vacuum heat insulating material because the member has a flat plate shape under atmospheric pressure load. Therefore, a thin vacuum insulation material can be obtained by using a powdered gas adsorbent.

  In the flat shape, a certain member fits in a space defined by two planes parallel to each other and having a curvature of 0, and the distance between the two most distant points in this member is 10 times or more the plane distance. There is something. Therefore, it does not necessarily mean that the curvature of the surface of a certain member is uniform throughout the member. Further, in order to make the vacuum heat insulating material thin, the distance between two surfaces parallel to each other and having a curvature of 0 is preferably 3 mm or less.

In the present invention, the member having the protrusion is formed by molding a flat member.

  In order to reduce the thickness of the vacuum heat insulating material, it is effective to reduce the thickness of the member having the protrusions.

  A member having a projection formed by bending a flat plate member or the like becomes close to a flat plate shape when an atmospheric pressure is applied, and a thin vacuum insulating material can be obtained.

In the present invention, the projection is formed by molding a flat plate member. For example, the projection is formed by cutting a part of the flat plate member and bending the cut along the cut. It will be.

  Since there is no need for a separate step of adding protrusions, the cost can be reduced and a low-cost vacuum heat insulating material can be obtained.

According to the present invention, the member having the protrusion is formed by bending at the notch of the flat plate member having the notch.

  When a member having a protrusion is vacuum-packed, it is deformed by atmospheric pressure and approaches a flat plate shape. However, when the strength of the plate-like member constituting the member having the protrusion is high, the member having the protrusion is unlikely to be flat even when atmospheric pressure is applied, and it is difficult to reduce the thickness of the vacuum heat insulating material. The notched portion of the plate-like member is easily deformed by an external force. Therefore, a member having a protrusion produced by bending at a notch portion is easily deformed at atmospheric pressure even when the strength of the plate-like member is large, and approaches a plate-like shape, so that a thin vacuum heat insulating material is obtained. be able to.

In the present invention, the member having the protrusion is made of metal.

  Since the member having the projection is a metal, the strength of the projection can be increased and sharpened. For this reason, the design freedom degree of a packaging material improves. That is, even if the strength of the packaging material is large, the inside of the packaging material and the inside of the jacket material are communicated. By increasing the strength of the packaging material, damage during handling before application to the vacuum heat insulating material is suppressed, so that the yield is improved and the vacuum heat insulating material can be obtained at low cost.

  Here, it is desirable that the metal has a certain strength in order to ensure the strength of the projection, and a metal composed of a single element such as iron or copper, or an alloy such as stainless steel or phosphor bronze can also be used. Not what you want.

In the present invention, the metal is a spring material.

  Since the metal is a spring material, it is easily deformed by the difference between the pressure inside the jacket material and the atmospheric pressure. Moreover, since it follows the shape of the jacket material, concentration of stress on the jacket material can be avoided, and bag breakage can be suppressed. Furthermore, since it is a spring material, once it is deformed, if it is removed from the vacuum heat insulating material and the pressure difference disappears, it becomes the shape before vacuum packaging, so it can be used repeatedly and can be recycled.

  Here, the spring material is a metal that is predominantly deformed, among elastic deformation and plastic deformation, which are typical deformations.

  As the spring material, beryllium copper, phosphor bronze, titanium copper, stainless steel or the like can be used, and phosphor bronze is particularly preferable.

In the present invention, the metal is phosphor bronze.

  Phosphor bronze has excellent spring characteristics and corrosion resistance, and a member having protrusions with excellent characteristics can be obtained.

In the present invention, the thickness of the flat plate member is 0.3 mm or less.

  In order to reduce the thickness of the vacuum heat insulating material, it is necessary that the member having the protrusion is easily deformed due to the difference between the pressure inside the jacket material and the atmospheric pressure and approaches a flat plate shape. When the thickness of the flat plate member is 0.3 mm or less, the plate member is easily deformed due to the difference between the pressure inside the jacket material and the atmospheric pressure, and approaches a flat plate shape. Therefore, a thin vacuum insulating material can be obtained.

  The thickness of the flat plate-like member may be 0.3 mm or less, but 0.2 mm or less is more desirable in order to facilitate deformation along the jacket material.

In the present invention, the member having the protrusion is made of resin.

  According to resin molding, the degree of freedom of shape of a member having a protrusion increases. Therefore, a projection suitable for the strength of the packaging material can be produced, and the design flexibility of the packaging material is increased. As a result, appropriate design is possible according to the use of the vacuum heat insulating material. Moreover, since it can be produced with the minimum required strength, it can be produced so as to be deformed by the difference between the pressure inside the jacket material and the atmospheric pressure, and a thin vacuum heat insulating material can be obtained.

  The type of the resin may be any material that can ensure the hardness of the protrusion and generates less gas, and can use polypropylene, polybutylene terephthalate, polystyrene, polyamide, polycarbonate, AS resin, ABS resin, etc. Considering polypropylene, it is desirable.

In the present invention, the resin is polypropylene.

  Since polypropylene is low in cost, the cost of a member having protrusions can be reduced. Moreover, when resin is applied to a vacuum heat insulating material, gas generation becomes a problem, but gas generation from polypropylene is small, and the characteristics of the vacuum heat insulating material are not hindered.

In the present invention, the resin is a fiber reinforced plastic.

  When glass fiber is used as the reinforcing fiber, gas generation from the fiber is small, and the effect of reinforcing the resin is high. By using a resin reinforced with glass fiber, the strength of the projection can be ensured, and the inside of the packaging material and the inside of the jacket material can be more smoothly communicated.

  A fiber is one that is significantly longer in one direction than the other in a three-dimensional space. There are glass fibers, carbon fibers, and metal fibers. However, there is less gas generation, the ability to reinforce plastics, and cost. Judging comprehensively, glass fiber is desirable.

In the present invention, the member having the protrusion is a composite of metal and resin.

  Since the member having the protrusions is a composite of metal and resin, it can be designed with a configuration corresponding to each material characteristic. In other words, in order to ensure communication between the inside of the packaging material and the inside of the jacket material, it is excellent by using metal as the projection that requires high strength and resin as the part that requires flexibility to protect the jacket material. A vacuum heat insulating material having the above characteristics can be obtained.

  Here, in order to ensure the strength of the protrusion, it is desirable that the metal has a certain strength, and a metal composed of a single element such as iron or copper, or an alloy such as stainless steel or phosphor bronze can be used. Not specified.

  The type of the resin may be any material that can ensure the hardness of the protrusion and generates less gas, and can use polypropylene, polybutylene terephthalate, polystyrene, polyamide, polycarbonate, AS resin, ABS resin, etc. Considering polypropylene, it is desirable.

In the present invention, the member having the protrusion is fixed to the packaging material.

  Since the member having the protrusion is fixed to the packaging material, the number of steps for installing the adsorbent on the vacuum heat insulating material can be reduced, and the cost can be reduced.

  The method for fixing the member having the protrusion to the packaging material is not particularly specified, but a hook-like portion is provided on the member having the protrusion, and the surface member having the adhesive applied on both sides is attached. This method can be used.

In the present invention, the length of the protrusion is shorter than the thickness of the gas adsorbent under atmospheric pressure.

  Since the length of the protrusion is shorter than the thickness of the gas adsorbent under atmospheric pressure, the protrusion remains inside the packaging material. Accordingly, the protrusions do not damage the outer cover material of the vacuum heat insulating material, and a vacuum heat insulating material with excellent reliability can be obtained.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a vacuum heat insulating material according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the vacuum heat insulating material 1 of the present embodiment includes a core material 2, a member 3 having protrusions, and a gas adsorbing material 5 that is previously vacuum-sealed in a packaging material 4. After being installed in the substrate 6 and vacuum sealed, the inside of the packaging material 4 and the inside of the coating material 6 are communicated. Specifically, the core material 2 including at least a fiber material and the gas barrier packaging material 4 are used. A gas adsorbent 5 that is vacuum-sealed in a bag, and a member 3 having a projection that can open a hole in the packaging material 4 when an external force is applied. And the inside of the jacket material 6 is vacuum-sealed, and the member 3 is deformed when it is pushed to the gas adsorbing material 5 side through the jacket material 6 so that the projections form holes in the packaging material 4. It is configured to open and allow the inside of the packaging material 4 and the inside of the jacket material 6 to communicate.

  The core material 2 is a glass fiber aggregate formed into a plate shape by thermoforming, the packaging material 4 is a laminated film having a gas barrier property, the adsorbent material 5 is a powdered CuZSM-5, and the jacket material 6 is a gas barrier property. It is a laminate film.

  2A and 2B are schematic views of the member 3 having protrusions used for the vacuum heat insulating material according to Embodiment 1 of the present invention, where FIG. 2A is a cross-sectional view and FIG. 2B is a top view.

  The member 3 having protrusions is a protrusion made by bending a plate made of phosphor bronze having a thickness of 0.25 mm to form a leaf spring, but cutting and bending the vicinity of the center. Further, the bent portion has a notch portion 7.

  FIG. 3 is a cross-sectional view showing an air adsorption device composed of a gas adsorbent and a member before vacuum sealing of the vacuum heat insulating material in Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view showing an air adsorption device composed of a gas adsorbent and a member after vacuum sealing of the vacuum heat insulating material in Embodiment 1 of the present invention.

  In FIG. 4, when atmospheric pressure is applied, the projections cause through holes in the packaging material, and the interior of the packaging material and the interior of the jacket material communicate with each other, so that the gas adsorbent adsorbs the gas inside the jacket material. Indicates a possible state.

  The operation | movement and effect | action are demonstrated about the vacuum heat insulating material 1 comprised as mentioned above.

  First, as shown in FIG. 3, in the gas adsorption device, the gas adsorbent 5 is vacuum-sealed with the packaging material 4. Further, the member 3 having the protrusion is in contact with the packaging material 4 at a portion other than the protrusion. Therefore, since no through-hole is generated in the packaging material 4, the gas adsorbent 5 does not come into contact with external air. Therefore, the adsorption capacity of the gas adsorbent 5 is maintained until it is applied to a vacuum heat insulating material.

  When vacuum-sealing the vacuum heat insulating material 1, a gas adsorption device is placed on the core material 2. At this time, the packaging material 4 was placed in contact with the core material 2. These were inserted into the jacket material 6 that had been sealed in three directions in advance, evacuated to vacuum, and then the opening was sealed by thermal welding.

  Since the inside of the jacket material 6 is depressurized, a pressure corresponding to the difference between the pressure inside the jacket material and the external pressure is applied to the core material 2 and the member 3 having the protrusions. Phosphor bronze, which is the material of the member 3 having protrusions, is elastically deformed when an external force is applied. Due to this deformation, in a state where no stress is applied, the protrusions that are spaced from the packaging material 4 approach the packaging material 4. Furthermore, since the protrusions contact the packaging material 4 and apply a piercing force, the packaging material 4 has a through hole. In this way, the inside of the packaging material 4 and the inside of the jacket material 6 communicate with each other, and gas adsorption by the adsorbent material 5 becomes possible.

  As shown in FIG. 4, after vacuum packaging, the member having the protrusions becomes nearly flat, and the contribution to the increase in the thickness of the vacuum heat insulating material is reduced.

  In this embodiment, the air adsorbing device separates the gas adsorbing material from the surrounding space when pressure is not applied, thereby preventing the gas adsorbing material from deteriorating. At the time of pressure loading, the gas adsorbing material communicates with the surrounding space. The air adsorbing material can adsorb external gas, and includes a member 3 having a protrusion, a gas adsorbing material 4, and a packaging material 5.

  In this embodiment, phosphor bronze is used as the metal. However, the present invention is not limited to phosphor bronze, and any other metal can be used as long as it is used as a spring material. Even if it is different from the spring material, it can be used by reducing the thickness to facilitate deformation.

  In addition, the contact between the projection and the packaging material and the generation of the through hole were made by the atmospheric pressure and the pressure difference inside the jacket material. However, the invention is not limited to this, and mechanical stress may be applied after vacuum sealing. good.

(Embodiment 2)
5A and 5B are schematic views of a member having protrusions used in the vacuum heat insulating material according to Embodiment 2 of the present invention, where FIG. 5A is a cross-sectional view and FIG. 5B is a top view.

  In FIG. 5, the member 3 having protrusions is a polypropylene resin reinforced with glass fiber, and the glass fiber is contained in 20 weight percent. Further, the bent portion is thinner than other portions. A vacuum heat insulating material was produced using the member 3 having the projection having such a configuration. The components other than the member 3 having the protrusions and the vacuum sealing method are the same as those in the first embodiment.

  A pressure corresponding to the difference between the pressure inside the jacket material and the external pressure is applied to the member 3 having the protrusions. Since the member 3 having protrusions is reinforced by glass fiber, the protrusions are not pressed against the packaging material 4 because the deformation is small at the original pressure. However, since the bent portion is thinner than the other portions, the bent portion is greatly deformed and the protrusion is pressed against the packaging material.

  Here, since the protrusion is polypropylene reinforced with glass fiber and has sufficient strength, a through hole is formed in the packaging material. In this way, the inside of the packaging material 4 and the inside of the jacket material communicate with each other, and gas adsorption by the gas adsorbing material 5 becomes possible.

  In the present embodiment, polypropylene is used as the resin. However, the present invention is not limited to this, and any resin can be used as long as it can generate a through hole in the packaging material.

(Embodiment 3)
FIG. 6 is a schematic view of a member having a projection used for the vacuum heat insulating material in Embodiment 3 of the present invention, (a) is a cross-sectional view, and (b) is a top view. FIG. 7 is a cross-sectional view of a gas adsorption device including a gas adsorbent and a member before vacuum sealing of the vacuum heat insulating material in Embodiment 3 of the present invention.

  In FIG. 6, the protrusions of the member 3 having protrusions are made of copper, and the portions other than the protrusions are made of polypropylene. Moreover, one of the parts which contact a packaging material in the state which has not added stress is hook shape.

  In FIG. 7, the member 3 having a protrusion is fixed to the packaging material 4 at a hook-like portion, and therefore the member 3 having the protrusion and the packaging material 4 can be handled as an integral member.

  A vacuum heat insulating material was produced using the member 3 having the projection having such a configuration. The components other than the member 3 having the protrusions and the vacuum sealing method are the same as those in the first embodiment. A pressure corresponding to the difference between the pressure inside the jacket material and the external pressure is applied to the member 3 having the protrusions. Since parts other than the protrusions of the member 3 having the protrusions are polypropylene and easily deform, the protrusions are pressed against the packaging material 4. Since the protrusion is made of copper and has sufficient strength, the packaging material 4 has a through hole. In this way, the inside of the packaging material 4 and the inside of the jacket material 6 communicate with each other, and the gas adsorbing material 5 can adsorb gas.

  In the present embodiment, copper is used as the metal. However, the present invention is not limited to this, and any metal can be used as long as it can generate a through hole in the packaging material.

Example 1
The core material was produced by pressing and heat-molding an aggregate of glass fibers into a plate shape so that the thickness was 5 mm.

  Powdered CuZSM-5 was used as the gas adsorbent. A film obtained by laminating a biaxially stretched polypropylene film having a thickness of 15 μm, an aluminum foil having a thickness of 6 μm, and a low-density polyethylene film having a thickness of 50 μm was used as the packaging material. This film was sealed in three directions to form a bag, and the gas adsorbent encapsulated in a rare gas atmosphere was placed in a vacuum chamber, and then reduced to 1 Pa and sealed.

  A member having protrusions is formed by bending a phosphor bronze plate having a length of 30 mm, a width of 12 mm, and a thickness of 0.25 mm at four locations in the length direction, and does not contact the surface of the packaging material. The distance from the surface was 3 mm when no pressure was applied. The protrusions were produced by cutting out and bending the central part in the length direction and the width direction, and the length was 2 mm. As a result, a gap of 1 mm was opened between the packaging material and the projection when no pressure was applied.

  As the jacket material, a film obtained by laminating a biaxially stretched nylon film having a thickness of 15 μm, a biaxially stretched nylon film having a thickness of 25 μm, an aluminum foil having a thickness of 6 μm, and a low density polyethylene film having a thickness of 50 μm was used. . The core material, the packaging material, and the member having the protrusions were stacked in this order in a jacket material that had been sealed in three directions in advance to form a bag, placed in a vacuum chamber, and sealed after reducing pressure to 10 Pa.

  When the thermal conductivity of the vacuum heat insulating material thus produced was measured, an excellent result of 0.0015 W / mK was obtained. As shown in (Comparative Example 1), it can be seen that the thermal conductivity is reduced compared to 0.0020 W / mK when no gas adsorbent is used. From this, it can be seen that the gas adsorbent adsorbs the gas inside the jacket material.

  Moreover, when the thickness of the vacuum heat insulating material was measured, the part of the member having the protrusion was 6.0 mm, and the other part was 5.0 mm. From this result, it is considered that the member having the protrusions was deformed in the direction in which the thickness was reduced from 3 mm to 1 mm by the air, and the protrusions were pressed against the packaging material. Furthermore, even if the thermal conductivity was measured after aging the vacuum heat insulating material at 100 ° C. for one month, the value did not change.

  As shown in (Comparative Example 1), when no gas adsorbent is used, the thermal conductivity is kept low compared to 0.0080 W / mK when aged at 100 ° C. for one month. From this, it can be seen that the air adsorbent adsorbs the gas entering through the seal layer. As a result of disassembling the vacuum heat insulating material after the thermal conductivity measurement and observing the packaging material, it was confirmed that there was a through hole caused by contact with the protrusion.

(Example 2)
The member having the protrusions was formed by molding a polypropylene resin containing 20% by weight of glass fiber into the same shape as in the first embodiment by injection molding. The thickness of the bent portion is 0.1 mm, and the thickness other than the bent portion is 0.2 mm. The constituent elements other than the members having protrusions and the method for manufacturing the vacuum heat insulating material are the same as those in the first embodiment.

  When the thermal conductivity of the vacuum heat insulating material thus produced was measured, an excellent result of 0.0015 W / mK was obtained. As shown in (Comparative Example 1), it can be seen that the thermal conductivity is reduced compared to 0.0020 W / mK when no gas adsorbent is used. From this, it can be seen that the gas adsorbent adsorbs the gas inside the jacket material.

  Moreover, when the thickness of the vacuum heat insulating material was measured, the part of the member having protrusions was 5.8 mm, and the other part was 5.0 mm. Compared with the case of Embodiment 1, the thickness of the part which has a protrusion is 0.2 mm thin. This is because polypropylene is softer than copper and deforms more easily when atmospheric pressure is applied. Furthermore, even if the thermal conductivity was measured after aging the vacuum heat insulating material at 100 ° C. for one month, the value did not change.

  As shown in (Comparative Example 1), when no gas adsorbent is used, the thermal conductivity is kept low compared to 0.0080 W / mK when aged at 100 ° C. for one month. From this, it can be seen that the air adsorbent adsorbs the gas entering through the seal layer. As a result of disassembling the vacuum heat insulating material after the thermal conductivity measurement and observing the packaging material, it was confirmed that there was a through hole caused by contact with the protrusion.

(Example 3)
The member having the protrusions was prepared by attaching a copper protrusion to one that was injection-molded with polypropylene resin. The thickness of the bent portion is 0.1 mm, and the thickness other than the bent portion is 0.2 mm. The constituent elements other than the members having protrusions and the method for manufacturing the vacuum heat insulating material are the same as those in the first embodiment.

  When the thermal conductivity of the vacuum heat insulating material thus produced was measured, an excellent result of 0.0015 W / mK was obtained. As shown in (Comparative Example 1), it can be seen that the thermal conductivity is reduced compared to 0.0020 W / mK when no gas adsorbent is used. From this, it can be seen that the gas adsorbent adsorbs the gas inside the jacket material.

  Moreover, when the thickness of the vacuum heat insulating material was measured, the part which has a protrusion was 5.7 mm, and the other part was 5.0 mm. Compared to the case of the first embodiment, the thickness of the portion having the protrusion is 0.3 mm, and is 0.1 mm thinner than that of the second embodiment. This is thought to be because the polypropylene resin is softer because it does not contain glass fibers.

  In addition, because copper is used for the projections, the function of generating through holes in the packaging material is excellent. After measuring the thermal conductivity, the vacuum insulation material was disassembled and the packaging material was observed. The presence of the through-hole generated by the above was confirmed.

Example 4
The member having the protrusions was produced by injection molding a polypropylene resin containing 20% by weight of glass fiber. One of the portions in contact with the packaging material has a hook shape and can be attached to the packaging material. In the process of manufacturing the vacuum heat insulating material, the hook-shaped portion was attached to the packaging material and installed inside the jacket material. By doing in this way, the shift | offset | difference of the member which has a protrusion, and a packaging material can be prevented. The configuration other than the members having protrusions and the vacuum packaging process are the same as those in the first embodiment.

(Example 5)
The member with protrusions is a phosphor bronze plate with a length of 30 mm, a thickness of 12 mm, and a thickness of 0.25 mm. The distance from the non-applied surface was set to 3 mm when no pressure was applied. The protrusions were produced by cutting out and bending the central part in the length direction and the width direction, and the length was 1 mm. The thickness when atmospheric pressure was applied to the packaging material in which the gas adsorbent was sealed was 1.2 mm. The other components are the same as those in the first embodiment.

  The vacuum heat insulating material was produced as follows. A core material was placed on a jacket material that had been sealed in three directions in advance, and the packaging material was placed so as not to overlap the core material. Further, a member having a protrusion was placed on the packaging material. Further, the inside of the jacket material was sealed after being reduced to 10 Pa. When the thermal conductivity of the vacuum heat insulating material thus produced was measured, an excellent result of 0.0015 W / mK was obtained. As shown in (Comparative Example 1), it can be seen that the thermal conductivity is reduced compared to 0.0020 W / mK when no gas adsorbent is used. From this, it can be seen that the gas adsorbent adsorbs the gas inside the jacket material.

  Moreover, when the thickness of the vacuum heat insulating material was measured, the core part was 5.0 mm and the location of the member having the protrusion was 1.5 mm. As described above, the maximum thickness of the vacuum heat insulating material is not increased by the member having the protrusions. Therefore, the vacuum heat insulating material can be made thinner. Moreover, since the low heat conductivity is acquired, it turns out that the through-hole has not arisen in the jacket material. This is because the protrusions remain inside the packaging material and do not contact the outer covering material.

(Comparative Example 1)
A vacuum heat insulating material was produced in the same manner as in Example 1 except that the gas adsorbing material, the packaging material, and the member having the protrusions were not used. When the thermal conductivity of the vacuum heat insulating material thus produced is measured, it is 0.0020 W / mK, which is larger than the thermal conductivity of 0.0015 W / mK when a gas adsorbent is used. I understand.

  Moreover, the thermal conductivity after aging the vacuum heat insulating material created in this comparative example at 100 ° C. for 1 hour is 0.0080 W / mK, and this is because the thermal conductivity is caused by the gas that has entered through the jacket material. This is because it has grown.

  As mentioned above, since the vacuum heat insulating material concerning this invention can obtain a thin vacuum heat insulating material more cheaply, it can be applied also to fields, such as heat insulation of a house.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention (A) Sectional drawing of the member which has the protrusion used for the vacuum heat insulating material of the embodiment (b) Top view of the member which has the protrusion used for the vacuum heat insulating material of the embodiment Sectional drawing which shows the air adsorption device before the vacuum sealing of the vacuum heat insulating material of the embodiment Sectional drawing which shows the air adsorption device after the vacuum sealing of the vacuum heat insulating material of the embodiment (A) Sectional drawing of the member which has the protrusion used for the vacuum heat insulating material in Embodiment 2 of this invention (b) Top view of the member which has the protrusion used for the vacuum heat insulating material of the embodiment (A) Sectional drawing of the member which has the protrusion used for the vacuum heat insulating material in Embodiment 3 of this invention (b) Top view of the member which has the protrusion used for the vacuum heat insulating material of the embodiment Sectional drawing of the gas adsorption device before the vacuum sealing of the vacuum heat insulating material in the embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Core material 3 Member which has a protrusion 4 Packaging material 5 Gas adsorbent material 6 Cover material 7 Notch part

Claims (10)

A core material including at least a fiber material, a gas adsorbent vacuum-sealed in a bag made of a gas barrier packaging material, and a protrusion capable of opening a hole in the packaging material when an external force is applied The member is covered with a jacket material having excellent gas barrier properties, and the inside of the jacket material is vacuum-sealed. The member is made of metal, the metal is a spring material, and the protrusion is the A vacuum heat insulating material configured to open a hole in the packaging material so as to communicate the interior of the packaging material with the interior of the jacket material. The vacuum heat insulating material according to claim 1, wherein the core material is a fiber assembly. The vacuum heat insulating material according to claim 1 or 2, wherein communication between the inside of the packaging material and the inside of the jacket material is performed by contact between the protrusion and the packaging material. The vacuum heat insulating material according to claim 3, wherein the contact between the protrusion and the packaging material is caused by a difference between the atmospheric pressure and the pressure inside the jacket material. The vacuum heat insulating material according to any one of claims 1 to 4, wherein the member having the protrusion is formed by molding a flat member. The vacuum heat insulating material according to claim 5 , wherein the member having the protrusion is formed by being bent at the notch of the flat plate-like member having the notch. Metals, vacuum heat insulating material according to claim 1 which is phosphor bronze. The vacuum heat insulating material according to claim 5 or 6 , wherein the flat member has a thickness of 0.3 mm or less. The vacuum heat insulating material according to any one of claims 1 to 8 , wherein the member having the protrusion is fixed to the packaging material. The vacuum heat insulating material according to any one of claims 1 to 9, wherein the length of the protrusion is shorter than the thickness of the gas adsorbent under atmospheric pressure.

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