JP2003314786A5 - - Google Patents

Description

0015.
[Means for solving problems]
In order to solve the above problem, in the vacuum heat insulating material of the present invention, the board-shaped core material is inserted into the outer cover material through the opening on one side of the outer cover material to reduce the pressure inside the outer cover material to open the opening. It is a sealed vacuum heat insulating material, and the core material is formed by adhering a binder to inorganic fibers having an average fiber diameter of 0.1 μm or more and 10 μm or less and compression molding into a board shape, and before depressurizing the core material. The density of the core material is 100 kg / m ³ or more and 400 kg / m ³ or less, the bending elasticity of the core material before decompression is 0.5 MPa or more, and the inner peripheral length of the opening and the said in a direction parallel to the opening. The feature is that the difference from the maximum outer peripheral length of the core material is larger than 0 mm and 30 mm or less .

0018.
Rigidity can be ensured by using a board-shaped core material molded using a binder with inorganic fibers as the main component, and even if the gap between the core material and the outer cover material is small, the core material is scraped by the edge of the outer cover material. It is possible to suppress the fact that it is being used.

[0019]
Along with this, the core material is scraped by the edge of the jacket material, and eventually the gap between the core material and the jacket material becomes large, or the scraped core material becomes powder and adheres to the jacket material, and the pressure is reduced. The possibility of causing a seal failure later is also greatly reduced.

0020
Here, if the average fiber diameter of the inorganic fibers used for the core material is less than 0.1 μm, industrial production is difficult and practically unsuitable, and if it is larger than 10 μm, the voids between the fibers become large and the initial heat insulating performance is excellent. The vacuum heat insulating material cannot be obtained.

0021.
Further, by reducing the density to 100 kg / m ³ or more and 400 kg / m ³ or less, the void diameter between the fibers is reduced, and further, by adding a binder to the inorganic fibers to maintain the above density, the predetermined fiber diameter is maintained. On the other hand, it is possible to obtain a core material having an optimum void diameter in terms of initial heat insulation performance and reliability.

[0022]
Here, if the density is less than 100 kg / m ³ , it is difficult to maintain the rigidity of the board, and if the gap between the core material and the outer cover material is small, the core material cannot be inserted properly, and 400 kg. If it is larger than / m ³ , the influence of solid heat conduction becomes large and the initial heat insulation performance deteriorates.

[0023]
When inserting the core material into the outer cover material, if the inner peripheral length of the opening is too large with respect to the outer peripheral length of the core material, the fin portion increases, and if it is too small, the core material cannot be inserted smoothly.

0024
Here, if the core material has a bending elastic modulus of a predetermined value or more, it can be smoothly inserted even in a state where the difference between the inner peripheral length of the opening and the outer peripheral length of the core material is 30 mm or less and the margin is small.

0025.
The vacuum heat insulating material produced in this way can reduce the area of the fin portion formed around the core material.

0026
Further, the vacuum heat insulating material of the present invention is formed by inserting a board-shaped core material into the outer cover material through an opening on one side of the outer cover material to reduce the pressure inside the outer cover material and seal the opening. The core material is a vacuum heat insulating material, which is formed by adhering a binder to an inorganic fiber having an average fiber diameter of 0.1 μm or more and 10 μm or less and compression-molding into a board shape. The density of the core material in the inside is 110 kg / m ³ or more and 413 kg / m ³ or less, and the bending elasticity of the core material when taken out from the outer cover material under atmospheric pressure after depressurization is 0.2 MPa or more. In at least one cross section in a direction parallel to the opening of the jacket material, the difference between the outer circumference length of the core material after vacuum encapsulation and the outer circumference length of the jacket material is larger than 0 mm and 70 mm or less. It is something to do.

[0027]
Since the core material obtained by molding the fiber material using a binder is elastic, it tends to be slightly reduced and deformed when it is inserted into the outer cover material to reduce the pressure and compressed by the atmospheric pressure. This deformation breaks the adhesion between the fibers by the binder, and the flexural modulus decreases.

[0028]
In consideration of this point, if a core material having a flexural modulus of 0.2 MPa or more when taken out from the outer cover material under atmospheric pressure after depressurization is used, the core material can be used as the outer cover material. Since the core material does not bend or crack during insertion, the core material can be inserted smoothly even if the gap between the core material and the outer cover material is small, and vacuum heat insulation with few fins. It becomes possible to obtain the material.

0037
For example, in the case of an outer cover material having fins in two directions in one cross section of the vacuum heat insulating material such as a four-way seal bag, the difference between the outer peripheral length of the outer cover material and the outer peripheral length of the core material is set to 70 mm or less. When the core material is placed in the center of the outer cover material, the length of the fin part generated on one side of the vacuum heat insulating material is 17 . If it is 5 mm or less, the foam heat insulating material is well filled even when the vacuum heat insulating material and the foam heat insulating material are applied to the heat insulating wall of the refrigerator / freezer, and heat leakage and deformation of the wall surface do not occur.

[0174]
【The invention's effect】
As described above, in the vacuum heat insulating material of the present invention, the board-shaped core material is inserted into the jacket material from the opening on one side of the jacket material, the inside of the jacket material is depressurized, and the opening is sealed. The vacuum heat insulating material is made by adhering a binder to inorganic fibers having an average fiber diameter of 0.1 μm or more and 10 μm or less and compression molding into a board shape, and the density of the core material before depressurization. Is 100 kg / m ³ or more and 400 kg / m ³ or less, the bending elasticity of the core material before depressurization is 0.5 MPa or more, and the inner peripheral length of the opening and the core material in the direction parallel to the opening. The difference from the maximum outer peripheral length of the core material is larger than 0 mm and 30 mm or less. Since the bending elasticity of the core material before decompression is 0.5 MPa or more, the core material is used as the outer cover material. Since the core material does not bend or crack during insertion, the core material can be inserted smoothly even if the gap between the core material and the outer cover material is small, and vacuum heat insulation with few fins. The material can be obtained.

[0175]
The core material is formed by adhering a binder to inorganic fibers having an average fiber diameter of 0.1 μm or more and 10 μm or less and compression-molding them into a board shape, and the density of the core material before decompression is 100 kg / m ³ or more and 400 kg / m. Since it is ³ or less, even if the gap between the core material and the outer cover material is small, it is possible to suppress the core material from being scraped by the edge of the outer cover material, and the scraped core material is powder. The possibility that it will adhere to the outer cover material and cause a sealing failure after depressurization is also greatly reduced. Further, it is possible to obtain a core material having an optimum void diameter in terms of initial heat insulating performance and reliability.

[0176]
Further, a vacuum heat insulating material is produced by a manufacturing method in which a board-shaped core material is inserted into the jacket material from an opening on one side of the jacket material to reduce the pressure inside the jacket material and seal the opening. Since the difference between the inner peripheral length of the opening and the maximum outer peripheral length of the core material in the direction parallel to the opening is larger than 0 mm and 30 mm or less, the area of the fin portion formed around the core material can be reduced. In addition, the core material can be inserted smoothly.

[0177]
Further, the vacuum heat insulating material of the present invention is formed by inserting a board-shaped core material into the outer cover material through an opening on one side of the outer cover material to reduce the pressure inside the outer cover material and seal the opening. The core material is a vacuum heat insulating material, and the core material is formed by adhering a binder to inorganic fibers having an average fiber diameter of 0.1 μm or more and 10 μm or less and compression molding into a board shape. The density of the core material in the inside is 110 kg / m ³ or more and 413 kg / m ³ or less, and the bending elasticity of the core material when taken out from the outer cover material under atmospheric pressure after depressurization is 0.2 MPa or more. In at least one cross section in a direction parallel to the opening of the jacket material, the difference between the outer circumference length of the core material after vacuum encapsulation and the outer circumference length of the jacket material is larger than 0 mm and 70 mm or less. Since the bending elasticity of the core material when taken out from the outer cover material under atmospheric pressure after depressurization was set to 0.2 MPa or more, the core material was evacuated when the core material was inserted into the outer cover material. Since it does not drip or crack, the core material can be inserted smoothly even if the gap between the core material and the outer cover material is made small, and a vacuum heat insulating material with few fins can be obtained.

[0178]
The core material is formed by adhering a binder to inorganic fibers having an average fiber diameter of 0.1 μm or more and 10 μm or less and compression-molding them into a board shape. Since the density is 110 kg / m ³ or more and 413 kg / m ³ or less, it is possible to prevent the core material from being scraped by the edge of the outer cover material even if the gap between the core material and the outer cover material is small. The possibility that the scraped core material becomes powder and adheres to the outer cover material, causing a sealing failure after depressurization is also greatly reduced. Further, it is possible to obtain a core material having an optimum void diameter in terms of initial heat insulating performance and reliability.

[0179]
Further, a vacuum heat insulating material is produced by a manufacturing method in which a board-shaped core material is inserted into the jacket material from an opening on one side of the jacket material to reduce the pressure inside the jacket material and seal the opening. In at least one cross section in the direction parallel to the opening of the jacket material, the difference between the outer circumference length of the core material after vacuum encapsulation and the outer circumference length of the jacket material is larger than 0 mm and 70 mm or less. It is possible to obtain an outer cover material that can minimize the fin portion even in the form of a bag.

Claims (4)

A vacuum heat insulating material comprising a board-like core material inserted into an outer covering material from an opening at one side of the outer covering material to decompress the inside of the outer covering material and sealing the opening, the core material Is made by attaching a binder to inorganic fibers having an average fiber diameter of 0.1 μm to 10 μm and compression molding it into a board shape, and the density of the core material before decompression is 100 kg / m ^{3 to} 400 kg / m ³ , The flexural modulus before pressure reduction of the core is 0.5 MPa or more, and the difference between the inner circumferential length of the opening and the maximum outer peripheral length of the core in the direction parallel to the opening is greater than 0 mm and 30 mm The vacuum heat insulating material characterized by being the following . A vacuum heat insulating material comprising a board-like core material inserted into an outer covering material from an opening at one side of the outer covering material to decompress the inside of the outer covering material and sealing the opening, the core material A binder is attached to inorganic fibers having an average fiber diameter of 0.1 μm to 10 μm and compression molded into a board shape, and after pressure reduction, the density of the core material in the outer covering material under atmospheric pressure is 110 kg / kg. m ³ or more 413Kg / m ³ or less, after decompression, the flexural modulus of the core material when removed from the envelope material at atmospheric pressure is not less 0.2MPa or more, a direction parallel to the opening of said outer covering material A vacuum heat insulating material characterized in that the difference between the outer peripheral length of the core material after sealing under reduced pressure and the outer peripheral length of the outer covering material is greater than 0 mm and not more than 70 mm in at least one cross section in . It has a vacuum heat insulating material in a space formed by an outer case, an inner case, the outer case and the inner case, and the vacuum heat insulating material is the one described in claim 1 or 2 Refrigeration equipment and cold equipment using vacuum insulation material. A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator connected annularly, wherein a flammable refrigerant is enclosed in the refrigeration cycle, an outer case, an inner case, and the outer case And a vacuum heat insulating material in a space formed by the inner box and the vacuum heat insulating material, wherein the vacuum heat insulating material is the one described in claim 1 or 2; Cold equipment.