JP2010242875A - Manufacturing method for vacuum heat insulating material and the vacuum heat insulating material manufactured by the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a vacuum heat insulating material that suppresses costs required for the manufacturing equipment of a vacuum heat insulating material using a metal outer package material while reducing manufacturing time. <P>SOLUTION: A core material is sealed in an interposing part I by sealing/welding lines 130a, 130c, and 130d and a temporary sealing/welding line 130' inside an outer package material 120 as shown in Fig.(e). A sealing material 200a is placed on a degassing port 140 provided in the outer package material 120 so as to decompress it inside a vacuum chamber, and the sealing material 200a is adhered to the outer package material 120 by an impulse sealer provided inside the vacuum chamber so as to seal the degassing port 140 as shown in Fig.(f). A sealing/welding line 130b is formed on the outer package material 120 under the atmospheric pressure as shown in Fig.(g). The outer package material 120 is cut along the sealing/welding line 130b so as to make the cut line (the chain line) as the right side 122b of the outer package material 120 as shown in Fig.(h). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating material manufacturing method using a metal outer packaging material and a vacuum heat insulating material manufactured by the manufacturing method.

Conventionally, in a vacuum heat insulating material in which a heat insulating member is housed in a metal outer packaging material and the inside of the metal outer packaging material is sealed in a vacuum, for example, the core material is made of two stainless steel foils. It is formed by sealing the butt portion of the stainless steel foil by seam welding after being bent and molded into a vacuum furnace in a state of being bent over the entire circumference and put into a vacuum furnace. (For example, see Patent Document 1).
In addition, as another method for manufacturing the vacuum heat insulating material described above, for example, a spacer, a metal foil, and a getter material are disposed between two metal thin plates or a two-folded metal thin plate, and the outer edge portion is a seam. After joining by welding or the like, the inside is evacuated through a tip tube or the like provided at a corner of the metal thin plate. And after sealing a chip pipe | tube etc. and joining the vicinity, the outer edge side of the said joining location was excised and the corner | angular part was cut off, and the vacuum heat insulating material was formed (for example, refer patent document 2).

JP-A-8-159376 JP 2001-311496 A

However, when manufacturing a vacuum heat insulating material by the method described in Patent Document 1 described above, in order to weld metal outer packaging materials while keeping the inside of the metal outer packaging material in a vacuum state, a vacuum chamber or the like is used. It is necessary to install a welder in the equipment. Therefore, the vacuum chamber becomes larger and complicated, and it is necessary to strengthen the exhaust device for reducing the pressure in the vacuum chamber, so that the equipment for manufacturing the vacuum heat insulating material becomes very expensive. There's a problem.
Moreover, when manufacturing a vacuum heat insulating material by the method described in Patent Document 2, it takes a long time until the inside of the metal thin plate is sufficiently depressurized because vacuuming is performed through a tip tube or the like. There is a problem that it is difficult to improve the performance.

  This invention is made | formed in view of the above-mentioned point, The place made into the objective is to suppress the cost required for the manufacturing equipment of the vacuum heat insulating material using a metal outer packaging material, and to shorten manufacturing time. It is providing the manufacturing method of the vacuum heat insulating material which can be performed, and the vacuum heat insulating material produced by the manufacturing method.

In order to achieve the above object, the present invention provides a method for producing a vacuum heat insulating material, which includes a core material portion and a metal outer packaging material that houses the core material portion and maintains the inside in a reduced pressure state. Because
A sealing step of sealing the metal outer packaging material in a state where the core material portion is housed inside the metal outer packaging material so as to be sandwiched from one surface side and the other surface side of the core material portion;
An opening step of opening a deaeration port at a position where the core material part does not exist in the metal outer packaging material when the core material part is stored;
A covering step of placing a sealing material on the deaeration port in a state where the inside and the outside of the metal outer packaging material can communicate with each other through the deaeration port;
A decompression step of decompressing the inside of the metal outer packaging material through a gap between the deaeration port and the sealing material;
In the state where the inside of the metal outer packaging material is decompressed, a closing step of closing the deaeration port with the sealing material;
The metal outer packaging material is divided into a core material region where the core material portion exists and a deaeration port region where the degassing port exists, and a reduced pressure state is maintained in the core material region. A joining step of joining the metal outer packaging material on the one surface side of the core material portion and the metal outer packaging material on the other surface side;
And removing the deaeration region from the metal outer packaging material.

In the manufacturing method according to the present invention, for example, the core part is sandwiched between two metal outer packaging materials from both sides, or one metal outer packaging material is folded in half and the core part is sandwiched from both sides. Then, it is housed inside the metal outer packaging material, and the housed core material portion is sealed inside the metal outer packaging material (sealing process). Then, in the metal outer packaging material, an exhaust hole is opened at a location where the housed core material portion does not exist (opening step).
In addition, the core member may be accommodated by a metal outer packaging material in which holes for exhaust are previously formed, and then the metal outer packaging material may be sealed (except for the deaeration port). In this case, the position of the deaeration port that is opened in advance is determined at a position that is out of the planned storage position of the core part in the metal outer packaging material.

Next, after the sealing material is placed on the deaeration port so that the air inside the metal outer packaging material can be discharged from the deaeration port (covering step), the deaeration port and the sealing material The inside of the metal outer packaging material is depressurized through the gap (decompression process), and the deaeration port is closed with the sealing material (blocking process).
Here, the order of the covering step and the pressure reducing step may be reversed. For example, after the pressure inside the metal outer packaging material is reduced in the vacuum chamber, the deaeration port is closed with the sealing material while maintaining the state. You may do it.
Then, in the metal outer packaging material, after joining the metal outer packaging materials positioned on both sides of the core material portion so as to be divided into the core material region and the deaeration port region (joining step), A portion of the deaeration region is removed from the outer packaging material (removal step).

  According to said manufacturing method, after decompressing the inside of a metal outer packaging material, a depressurization state can be maintained by plugging a deaeration port with a sealing material, and a joining process can be performed under atmospheric pressure. Therefore, it is not necessary to integrally perform the decompression process and the joining process, and the equipment for performing the decompression process and the equipment for performing the joining process can be installed separately. Therefore, a vacuum heat insulating material can be manufactured without requiring expensive equipment which enables joining of metal outer packaging materials under reduced pressure.

Further, in the manufacturing method according to the present invention, the deaeration port is a through-hole penetrating the metal outer packaging material on the one surface side and the other surface side,
In the covering step, the opening of the deaeration port in the metal outer packaging material on the one surface side and the opening of the deaeration port in the metal outer packaging material on the other surface side are each made of the sealing material. A covering step is preferred.

  According to the above manufacturing method, the metal outer packaging on the one surface side and the other surface side is formed by using the through holes penetrating the metal outer packaging material on one surface side and the other surface side of the core portion as the deaeration port. A sealing material is mounted on each through-hole from the material. For this reason, compared with the case where a deaeration port is provided only on one side, the time required for decompression can be shortened, and the operation of providing the deaeration port becomes easier.

Further, in the manufacturing method according to the present invention, the sealing material is a member including an adhesion layer made of at least a thermoplastic resin,
The closing step is preferably a step of closely contacting the metal outer packaging material by applying heat to the adhesion layer.

  According to said manufacturing method, since the member containing the contact | adherence layer which consists of a thermoplastic resin is used as a sealing material, it closely_contact | adheres to metal outer packaging material by heating, and closes a deaeration port. As a result, the facility for performing the closing process can be downsized with a simple structure because only a device that only partially heats the location where the sealing material is disposed in the metal outer packaging material can be realized. Can be integrated into a device for reducing pressure relatively easily and inexpensively. That is, the process of closing the deaeration port with the sealing material while maintaining the reduced pressure state can be realized by a relatively inexpensive device.

Further, in the manufacturing method according to the present invention, in the decompression step, the metal outer packaging material provided with the deaeration port in a state in which the core material portion is accommodated is accommodated in a vacuum chamber, and the metal outer packaging material is stored. Depressurize the inside of
In the closing step, it is preferable that the sealing material is heated by a heat-sealing machine provided in the vacuum chamber so that the sealing material is in close contact with the metal outer packaging material and the deaeration port is closed.

  According to the above manufacturing method, a pressure reduction process is performed in a vacuum chamber, and a clogging process is performed in the vacuum chamber using a heat-sealing machine that is generally easily available, such as an impulse sealer, and can be downsized. Therefore, it is possible to configure a facility that can integrally perform the decompression process and the closing process relatively inexpensively.

  Moreover, the vacuum heat insulating material which concerns on this invention is a vacuum heat insulating material produced by one of the manufacturing methods mentioned above.

  According to the method for manufacturing a vacuum heat insulating material according to the present invention, the cost required for the manufacturing facility for the vacuum heat insulating material using the metal outer packaging material can be suppressed, and the manufacturing time can be shortened.

It is a perspective view which shows the external appearance of the vacuum heat insulating material manufactured by the manufacturing method of this invention. It is a front view which shows the external appearance of the same vacuum heat insulating material. It is explanatory drawing for demonstrating the manufacturing process of the vacuum heat insulating material by the manufacturing method of this invention. It is explanatory drawing for demonstrating the manufacturing process of the vacuum heat insulating material by the manufacturing method of this invention. It is explanatory drawing for demonstrating the schematic structure of the apparatus used for the obstruction | occlusion process in the manufacturing method of this invention, and the content of the obstruction | occlusion process.

Embodiments of the present invention will be described below with reference to the drawings.
<<< Structure of vacuum insulation material >>>
FIG. 1 is a perspective view showing the external appearance of the vacuum heat insulating material 100, and FIG. 2 is a front view showing the external appearance of the vacuum heat insulating material 100.
As shown in FIGS. 1 and 2, the vacuum heat insulating material 100 can be made by housing the core material portion 110 in the outer packaging material 120 and forming a sealing welding line 130. Details of the manufacturing method of the vacuum heat insulating material 100 will be described later. Since the welding line 130 for sealing is formed so as to be visible, it is shown by a solid line in FIGS. Moreover, since the core material part 110 is covered with the outer packaging material 120, it was shown with the broken line in FIG. 1, FIG.

<< Core material part 110 >>
<Shape of the core part 110>
Although the shape of the core part 110 is not specifically limited, Usually, it has a substantially flat plate shape as shown in FIGS. The thickness and size of the core member 110 may be determined as appropriate according to the size of the place where the vacuum heat insulating material 100 is actually attached and the required heat insulating performance.

<Material of core part 110>
Although the core material part 110 is not specifically limited, a fiber assembly, an open cell foam, etc. are used. A fiber assembly is preferable from the viewpoint of heat insulation. From the viewpoint of workability, the fiber assembly is preferably used in a substantially plate shape as described above. When the fiber assembly is used as it is in the “wadding state” or in the refined “powdered state”, the handling property of the core material part 110 is deteriorated. The process of storing in 120 becomes complicated and the workability deteriorates.

The fiber assembly is composed of inorganic fibers, organic fibers, or a mixture thereof.
Examples of the inorganic fiber include glass fiber (glass wool), alumina fiber, slag wool fiber, silica fiber, rock wool, and the like.

  Examples of organic fibers include polyester fibers, acrylic fibers, polyethylene fibers, polypropylene fibers, nylon fibers, polyvinyl alcohol fibers, polyurethane fibers, polynosic fibers, rayon fibers, and other synthetic fibers, and natural fibers such as hemp, silk, cotton, and wool. Etc. An inorganic fiber and an organic fiber are used as single fiber which consists of 1 type, or multiple types of mixed fiber.

  In this embodiment, in order to take advantage of the heat resistance of the outer packaging material 120 to be described later, the core material portion 110 is preferably an inorganic core material portion having excellent heat resistance. Part is particularly preferred.

<< Outer packaging material 120 >>
<Shape of outer packaging material 120>
As shown in FIG. 1, the outer packaging material 120 is formed by two sheet-shaped outer packaging materials 120a and 120b. In FIG. 1, the thickness of the outer packaging materials 120a and 120b is exaggerated for easy understanding. However, as will be described later, when a thin metal plate is used as the outer packaging material 120, the actual thickness is 0. .05mm to about 0.5mm. Hereinafter, the outer packaging materials 120a and 120b may be simply referred to as the outer packaging material 120.

  Each of the two outer packaging materials 120a and 120b has a certain shape such as a square or a rectangle. The shape and size of each of the two outer packaging materials 120a and 120b may be appropriately determined according to the shape and size of the core member 110, the shape and size of the non-intervening portion N described later, and the like.

  As will be described later, the two outer packaging materials 120a and 120b are overlapped with each other, and the two outer packaging materials 120a and 120b are welded so as to go around the core material portion 110 with the core material portion 110 interposed therebetween. By doing so, the vacuum heat insulating material 100 can be made. In addition, as shown in FIG. 1, instead of using the two outer packaging materials 120a and 120b, one rectangular outer packaging material may be folded in half, thereby accommodating the core material portion 110 therebetween. .

<Material of outer packaging material 120>
Any material can be used as the outer packaging material 120 as long as it is a metal that can sufficiently withstand the function of the vacuum heat insulating material 100 under conditions such as temperature and pressure at which the vacuum heat insulating material 100 is used. For example, various steel thin plates such as a mild steel thin plate, a stainless steel thin plate, a galvanized steel thin plate, an aluminum alloy thin plate, a titanium thin plate, a tin thin plate, and the like can be used. In particular, it is preferable to use stainless steel, iron, titanium or the like having a plate thickness of about 0.05 mm to 0.5 mm.

  In addition, the outer packaging material 120 may be configured not only by a single layer of metal thin plate but also by a plurality of layers of metal thin plate. The configuration of the outer packaging material may be appropriately determined in consideration of the heat resistance, the heat insulating property of the core member 110, and the like.

<Sealing welding line 130, intervening portion I, non-intervening portion N (proximity region P, separation region D)>
As will be described later, the vacuum heat insulating material 100 sandwiches the core material portion 110 between the two outer packaging materials 120a and 120b, and welds the two outer packaging materials 120a and 120b along the outer periphery of the core material portion 110. Can be made. As shown in FIGS. 1 and 2, a welding line 130 for sealing can be formed by welding the two outer packaging materials 120a and 120b. As shown in FIGS. 1 and 2, the sealing welding line 130 (130 a to 130 d) extends from the end of one side of the outer packaging material 120 to the end of the other side facing the one side. , And formed substantially parallel along another side sandwiched between one side and the other side.

  Specifically, the welding line 130a for sealing extends from the end of one side 122d of the outer packaging material 120 to the end of the other side 122b facing the one side 122d, It is formed substantially in parallel along another side 122a sandwiched between the side 122b. The sealing welding line 130b is sandwiched between one side 122a and the other side 122c from the end of one side 122a of the outer packaging material 120 to the end of the other side 122c facing the one side 122a. The other side 122b is formed substantially in parallel. The sealing welding line 130c is sandwiched between one side 122b and the other side 122d from the end of one side 122b of the outer packaging material 120 to the end of the other side 122d facing the one side 122b. It is formed substantially in parallel along another side 122c. The sealing welding line 130d is sandwiched between one side 122c and the other side 122a from the end of one side 122c of the outer packaging material 120 to the end of the other side 122a facing the one side 122c. It is formed substantially in parallel along another side 122d.

  Note that the four sides 122a to 122d of the outer packaging material 120 described above are denoted by the same reference numerals for the two outer packaging materials 120a and 120b as sides common to the two outer packaging materials 120a and 120b. Hereinafter, for convenience, the side 122a is referred to as an upper side, the side 122b is referred to as a right side, the side 122c is referred to as a lower side, and the side 122d is referred to as a left side.

  As described above, by forming the welding line for sealing 130 (130a to 130d), the welding line for sealing 130 is formed to circulate around the core part 110, and includes the core part 110. It is possible to accurately seal the region. An area including the core part 110, that is, an area formed by sandwiching the core part 110 between the two outer packaging materials 120a and 120b (an area surrounded by a broken line in FIG. 2) is a core material. Since the part 110 intervenes, it is called an interposition part I. Further, the region where the core material part 110 is not sandwiched between the two outer packaging materials 120a and 120b (the region indicated by two types of hatching in FIG. 2) is the non-intervening part N because the core material part 110 is not interposed. Called.

  Further, the non-intervening portion N can be divided into a proximity region P and a separation region D by the sealing welding line 130. The proximity region P is a region extending between the interposition part I and the sealing welding line 130 (a region indicated by hatching with a right-down diagonal line in FIG. 2). Further, the separation region D is a region (a region indicated by hatching with a right-up diagonal line in FIG. 2) extending away from the interposition part I than the sealing welding line 130. Therefore, in the vacuum heat insulating material 100 shown in the present embodiment, the proximity region P extends so as to go around the interposition part I, and the separation region D extends so as to go around the proximity region P. Further, the sealing welding line 130 is formed so as to be in contact with both the proximity region P and the separation region D. In other words, the sealing welding line 130 is formed so as to partition and demarcate the proximity region P and the separation region D.

  As described above, the sealing welding line 130 is formed so as to circulate around the core member 110, and the vacuum heat insulating material 100 is sealed by the sealing welding line 130. That is, both the intervening portion I and the proximity region P are maintained in a reduced pressure state by the sealing welding line 130. Further, as described above, both the intervening portion I and the adjacent region P of the vacuum heat insulating material 100 function as a vacuum maintaining region because the decompressed state is maintained. On the other hand, the separation region D is formed so as to go around the intervening portion I and the proximity region P, and the separation region D functions as a non-vacuum region because it is not in a vacuum state.

  Thus, the sealing welding line 130 is formed so as to circulate around the interposition part I (core part 110) and the proximity region P. In particular, the sealing welding line 130 is preferably formed so as not to overlap with the interposition part I (core part 110) and as close as possible to the outer periphery of the interposition part I (core part 110). . As described above, by forming the sealing welding line 130, the interposition part I (core material part 110) can be increased, so that a region having a heat insulation effect can be increased. Since the core part 110 does not exist in the non-intervening part N (the proximity area P and the separation area D), it does not contribute to the heat insulation effect.

  Furthermore, the width of the sealing welding line 130 itself is preferably within 5 mm. If the conventional outer packaging material inner layer is heat-sealed, the wider the width, the better the long-term heat insulation performance. Therefore, the width required for heat-sealing is usually about 10 mm. However, in the present invention, since the vacuum heat insulating material 100 is attached to the attachment body B using the separation region D divided by the sealing welding line 130, it is preferable as the heat insulation efficiency to provide a non-existing portion more than necessary. It is preferable to reduce the width of the sealing welding line 130 itself. Especially preferably, it is 0.5-3 mm. Further, the width of the non-intervening portion N is not particularly limited depending on the size of the vacuum heat insulating material, but is about 3 to 70 mm, and preferably 10 to 40 mm from the viewpoint of heat insulating efficiency and mounting property. is there.

<< Getter agent >>
<Function of getter agent>
A getter agent (not shown) may be provided in the outer packaging material 120. After depressurizing the inside of the outer packaging material 120 and welding it, gas, for example, outgas or moisture may be generated from the core material portion 110 inside the outer packaging material 120, which may reduce the degree of vacuum. For this reason, it is preferable to store the getter agent capable of adsorbing gas and moisture together with the core member 110 in the outer packaging material 120. In this way, by storing the getter agent in the outer packaging material 120, gas and moisture can be absorbed by the getter agent, so that the heat insulating effect of the vacuum heat insulating material 100 can be maintained for a longer time.

<Material of getter agent>
The substance capable of adsorbing gas and moisture is not particularly limited, and examples of substances that physically adsorb gas and moisture include activated carbon, silica gel, aluminum oxide, molecular sieve, and zeolite. Also, those that chemically adsorb gas, moisture, etc. are, for example, calcium oxide, barium oxide, calcium chloride, magnesium oxide, magnesium chloride, metal powder materials such as iron and zinc, barium-lithium alloys, zirconium There are system alloys.

<< Method for Manufacturing Vacuum Insulating Material 100 >>
Next, the manufacturing method of the vacuum heat insulating material 100 mentioned above is demonstrated with reference to FIGS. Here, FIG. 3 and FIG. 4 are schematic views schematically showing the manufacturing process of the vacuum heat insulating material 100. FIG. 5 is a diagram schematically showing an apparatus used in the process of closely attaching the sealing film described later to the outer packaging material 120 in the manufacturing process of the vacuum heat insulating material 100.

As shown in FIG. 3 (a), two metal outer packaging materials 120a and 120b having substantially the same size, each having a rectangular shape in which the opposing sides are each composed of a long side and a short side, are prepared. The two outer packaging materials 120a and 120b are arranged so as to substantially overlap. Here, the upper side 122a and the lower side 122c of the outer packaging material 120 are long sides, and the temporary right side 122b ′ and the left side 122d are short sides. The material is a stainless foil with a thickness of 80 μm, and the dimensions are 1070 mm for the long side and 700 mm for the short side.
Here, the provision of the temporary right side 122 ′ is different from the right side 122b when the vacuum heat insulating material 100 is completed.

  Then, sealing welding lines 130a, 130c, and 130d are formed along the three sides of the upper side 122a, the lower side 122c, and the left side 122d, respectively, and the outer packaging material 120 is opened on the temporary right side 122b ′ side. It is configured in a bag shape. Here, the positions where the sealing welding lines 130a, 130c, and 130d are formed are positions 10 mm away from the corresponding upper side 122a, lower side 122c, and left side 122d, respectively.

  Next, as shown in FIG. 3 (b), the core material part 110 is accommodated in the bag-shaped outer packaging material 120 from the temporary right side 122b ′ where the sealing welding line 130 is not formed, A temporary sealing welding line 130 ′ is formed along the right side 122 b ′ (see FIG. 3C). The position where the temporary sealing welding line 130 ′ is formed is a position 10 mm away from the temporary right side 122 b ′. Accordingly, a blank portion (a portion surrounded by a broken line in FIG. 3C) is surrounded by the right side of the interposition portion I, the sealing welding lines 130a and 130c, and the temporary sealing welding line 130 ′. ) Is formed.

  Each of the sealing welding lines 130 described above is formed by welding, but the type of welding is that the two outer packaging materials 120a and 120b can be joined, and the interposed portion I and the adjacent region P are sealed in a reduced pressure state. Any type of arc welding, electron beam welding, resistance welding, or the like may be used as long as the above can be maintained. For example, there are pressure bonding methods such as seam welding, butt welding such as TIG welding, MIG brazing, and the like. In particular, it is preferable to use a welding method that does not generate gas or the like from the sealing welding line 130 that is a joint even in a vacuum state or a high temperature state. In addition to welding, the sealing welding line 130 may be formed by soldering or brazing. 4A to 4C correspond to a sealing process.

  In the above-described process, first, the welding lines 130a, 130c, and 130d for sealing are respectively formed along the three sides of the outer packaging materials 120a and 120b, and once formed into a bag shape, the core material portion 110 is then used as the outer packaging material. 120, the welding line 130 ′ for temporary sealing was formed, but the core part 110 was sandwiched between the outer packaging materials 120a and 120b, and sealed along each side 122a to 122d of the outer packaging material 120. Stop welding lines 130a, 130c, and 130d and temporary sealing welding line 130 'may be formed sequentially.

  Next, as shown in FIG. 3D, a deaeration port 140 for reducing the pressure inside the outer packaging material 120 is provided in the above-described blank portion. Here, the deaeration port 140 is a through hole having a diameter of 3 mm, and an opening of the deaeration port 140 exists in each of the outer packaging materials 120a and 120b. In FIG. 3D, one deaeration port 140 is provided at the center in the short side direction of the outer packaging material 120, but a plurality of deaeration ports 140 may be provided according to the size of the outer packaging material 120. Moreover, the deaeration port 140 does not necessarily need to be a through hole, and may be provided only in either the outer packaging material 120a or 120b. The process shown in FIG. 3D described above corresponds to an opening process.

  Next, as shown in FIG. 4E, the sealing material 200 is placed in the opening of the deaeration port 140 in each of the outer packaging materials 120a and 120b. For example, a sealing material 200a (see FIG. 5 described later) is placed on the opening on the outer packaging material 120a side, and another sealing material 200b (see FIG. 5 described later) is placed on the opening on the outer packaging material 120b side. ) Is placed on the outer packaging material 120 so that the opening on the outer packaging material 120b side is located. This step corresponds to a coating step.

  Here, the sealing material 200 is a member such as a lump or a sheet, and may be any member that can temporarily seal the deaeration port by being in close contact, and any thermoplastic resin can be used without particular limitation. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, nylon resin, polyester resin, ethylene-acrylic acid copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-methacrylic acid copolymer resin, and ethylene-vinyl alcohol copolymer. Ethylene-modified copolymer resins such as polymer resins, polyvinyl alcohol resins and the like can be used. In particular, in the case of an ethylene-modified copolymer resin such as an ethylene-acrylic acid copolymer resin, the adhesiveness with the stainless steel foil as the material of the outer packaging material 120 is good, and the adhesion with the outer packaging material is improved. Further, instead of the thermoplastic resin, a resin curable by ultraviolet rays (hereinafter referred to as an ultraviolet curable resin) may be used, and the deaeration port may be temporarily sealed by irradiating the ultraviolet rays.

  Moreover, it is preferable that the sealing material 200 has a multilayer sheet-like structure including the adhesion layer made of the above-described thermoplastic resin and a layer having a gas barrier property (hereinafter referred to as a gas barrier layer). As the gas barrier layer, a metal foil, a resin having a metal vapor deposition layer, an ethylene-vinyl alcohol copolymer resin, or the like can be used. Further, when the sealing material 200 has the multilayer structure described above and an ultraviolet curable resin is used as the adhesion layer, it is necessary to irradiate the adhesion layer with ultraviolet rays through the gas barrier layer when the sealing material 200 is adhered to the outer packaging material 120. For this reason, the gas barrier layer needs to have optical transparency.

  Furthermore, for example, an outer packaging material of a vacuum heat insulating material used in a refrigerator or the like may be used as it is for the adhesion layer made of the thermoplastic resin described above. As an outer packaging material of a vacuum heat insulating material used for a refrigerator or the like, for example, a four-layer structure in which nylon, aluminum-deposited PET (polyethylene terephthalate), aluminum foil, and high-density polyethylene are laminated in this order from the outermost layer to the innermost layer. Gas barrier film made of, polyethylene terephthalate resin, aluminum foil, gas barrier film made of high density polyethylene resin, polyethylene terephthalate resin, ethylene-vinyl alcohol copolymer resin having an aluminum deposited layer, gas barrier film made of high density polyethylene resin, etc. Is mentioned.

  Next, in the state shown in FIG. 4E, the outer packaging material 120 containing the core member 110 is placed in a vacuum chamber and decompressed (evacuated). At this time, the sealing material 200 is not fixed to the outer packaging material 120 at all, but since the entire inside of the vacuum chamber is depressurized, the sealing material 200 is maintained in a flat state. Further, the air inside the outer packaging material 120 is sucked out of the sealing material 200 from the deaeration port 140 through the gap between the sealing material 200 and the outer packaging material 120. Thereby, compared with the case where it decompresses via a tip pipe | tube, the decompression time required in order to obtain a required vacuum degree can be shortened significantly. Note that the process shown in FIG. 4E described above corresponds to a decompression process.

Next, in the vacuum chamber, the region indicated by hatching in FIG. 4F is heated by an impulse sealer while keeping the pressure reduced, and the sealing material 200 is brought into close contact with the outer packaging material 120. This process corresponds to a closing process.
Here, with reference to FIG. 5, the structure around the heating part of the impal sealer installed in the vacuum chamber will be described. FIG. 5 is a side view of the outer packaging material 120 as viewed from the lower side 122c when the closing process shown in FIG. 4 (f) is performed, and the outer packaging material 120 is taken along the line AA in FIG. 4 (f). This is shown in the figure. FIGS. 5A, 5B, and 5C show the movement of the impal sealer when performing the above-described closing process.

  As shown in FIG. 5A, the heating unit of the impal sealer is mainly composed of an upper heating body 301 and a lower heating body 302. The upper heating body 301 is provided on the surface of the elongate bar-shaped base member 310a in the depth direction of FIG. 5, the heat-resistant rubber 311a attached to the lower surface of the base member 310a, and the heat-resistant rubber 311a. A nichrome ribbon 312a through which a large current flows sometimes, and an anti-adhesion film 313a attached to the base member 310a so as to cover the surface of the heat resistant rubber 311a and the nichrome ribbon 312a. Similarly, the lower heating body 302 includes a base member 310b, a heat resistant rubber 311b, a nichrome ribbon 312b, and an anti-adhesion film 313b. In the following description, when the parts of the upper heating body 301 and the lower heating body 302 are distinguished, the words “upper” or “lower” are added to the beginning of the names of the respective parts.

  In the vacuum chamber in which the impulse sealer having the above-described configuration is installed, first, when the decompression process is performed in the state shown in FIG. 4E, the upper heating body 301 and the lower heating body 302 are separated from each other. The opening of the deaeration port 140 of the outer packaging material 120 is placed on the lower adhesion preventing film 313b so as to be sandwiched between the sealing materials 200a and 200b (see FIG. 5A). When the pressure inside the vacuum chamber is reduced to complete the pressure reduction inside the outer packaging material 120, the upper heating body 301 is then lowered in the direction indicated by the arrow in FIG. The outer packaging material 120 is sandwiched between the upper heating body 301 and the lower heating body 302 via the sealing materials 200a and 200b, and the upper heating body 301 is further lowered to apply pressure (see FIG. 5B). . Then, a large current is passed through the upper nichrome ribbon 312a and the lower nichrome ribbon 312b to heat the sealing materials 200a and 200b and to fuse them to the outer packaging materials 120a and 120b, respectively. At this time, the sealing materials 200a and 200b are also fused to each other in the deaeration port 140 (see FIG. 5C). Thus, by making the deaeration port 140 a through-hole, not only can the pressure reduction time be shortened, but an improvement in the air density in the deaeration port 140 can be expected. Then, when the closing process is finished, the upper heating body 301 is raised again to a fixed position.

  Returning to FIG. 4, the outer packaging material 120 is taken out from the vacuum chamber, and is divided into a region where the deaeration port 140 is formed and a region where the core member 110 is present in the outer packaging material 120 under atmospheric pressure. At the position, a sealing welding line 130b is formed along the right side of the core part 110 (see FIG. 4G). This process corresponds to a bonding process. Further, as shown by a one-dot chain line in FIG. 4H, the outer packaging material 120 is cut along the sealing welding line 130b at a position spaced by 10 mm from the sealing welding line 130b. The side formed by this cutting becomes the right side 122 b of the outer packaging material 120. Further, the cutting position is set to the interval (10 mm) between the sealing welding line 130 and the side 122 of the outer packaging material 120 on the other three sides. The above process shown in FIG. 4H corresponds to a removal process.

  The vacuum heat insulating material 100 is completed through the above steps. According to the above-described method for manufacturing a vacuum heat insulating material, in the vacuum chamber, after the pressure inside the outer packaging material 120 is reduced in a short time, the degassing port 140 is closed by the sealing material 200 so that the reduced pressure state can be maintained. Therefore, the joining process can be performed under atmospheric pressure. That is, for example, the vacuum heat insulating material 100 can be manufactured without requiring expensive equipment that allows the outer packaging materials 120a and 120b to be welded in the vacuum chamber.

  In addition, since a member having heat-fusibility is used as the sealing material 200, an impulse sealer, which can be obtained at a low cost and can be incorporated into the vacuum chamber relatively easily, Temporary sealing of the deaeration port 140 shown in 4 (f) can be performed. In addition, the use of the above-described layer having excellent gas barrier properties and the use of a thermoplastic resin having excellent adhesion to the outer packaging material 120 makes it possible to maintain the reduced pressure inside the outer packaging material 120 for a long time. Therefore, in consideration of the time required for the joining process shown in FIG. 4 (h), the number of outer packaging materials 120 to be depressurized at a time can be increased in the vacuum chamber, and the productivity per unit time can be increased. Can be increased.

  In the above-described embodiment, the opening process illustrated in FIG. 3D is performed after the contact process illustrated in FIGS. 3A to 3C is performed. First, the blank in the outer packaging material 120 is performed. A deaeration port 140 is opened in a portion (a region surrounded by a broken line shown in FIG. 3C), and then the sealing welding lines 130 a to 130 d and the temporary sealing are provided on the outer packaging material 120 containing the core member 110. A welding line 130 'may be formed. Further, the sealing material 200 is not limited to a member having an adhesion layer, and for example, a resin curable by ultraviolet rays (hereinafter referred to as an ultraviolet curable resin) may be used.

  In this case, the deaeration port 140 is provided only in the outer packaging material 120 on the upper surface side (for example, in the case of the outer packaging material 120 in the state shown in FIG. 4, the outer packaging material 120 a). A device (for example, a dispenser) for dropping the degassing port 140 is provided. First, in the state shown in FIG. 3D (however, the deaeration port 140 is provided only in the outer packaging material 120a), a pressure reduction process is performed in the vacuum chamber, and then in the vacuum chamber. Then, the coating step is performed by dropping the ultraviolet curable resin into the deaeration port 140 using the above-described dispenser or the like. In addition, a blocking process is performed by applying ultraviolet rays from the outside to the dropped UV curable resin through a window provided in the vacuum chamber, and after the UV curable resin is sufficiently cured, the outer packaging material 120 is taken out from the vacuum chamber. Then proceed to the next step. Thus, when an ultraviolet curable resin is used as the sealing material 200, the order of the coating process and the pressure reduction process is switched.

100 Vacuum heat insulating material 110 Heat insulating material (core material part)
120 (120a, 120b) Outer packaging material 130 (130a, 130b, 130c, 130d) Sealing welding line 130 'Temporary sealing welding line 140 Deaeration port 200 Sealing material 301 Upper heating element 302 Lower heating element I Intervening part N Non-intervening part

Claims (5)

A method for producing a vacuum heat insulating material, comprising: a core material part; and a metal outer packaging material that houses the core material part and maintains the inside in a reduced pressure state,
A sealing step of sealing the metal outer packaging material in a state where the core material portion is housed inside the metal outer packaging material so as to be sandwiched from one surface side and the other surface side of the core material portion;
An opening step of opening a deaeration port at a position where the core material part does not exist in the metal outer packaging material when the core material part is stored;
A covering step of placing a sealing material on the deaeration port in a state where the inside and the outside of the metal outer packaging material can communicate with each other through the deaeration port;
A decompression step of decompressing the inside of the metal outer packaging material through a gap between the deaeration port and the sealing material;
In the state where the inside of the metal outer packaging material is decompressed, a closing step of closing the deaeration port with the sealing material;
The metal outer packaging material is divided into a core material region where the core material portion exists and a deaeration port region where the degassing port exists, and a reduced pressure state is maintained in the core material region. A joining step of joining the metal outer packaging material on the one surface side of the core material portion and the metal outer packaging material on the other surface side;
A removal step of removing the deaeration region from the metal outer packaging material. The deaeration port is a through-hole penetrating the metal outer packaging material on the one surface side and the other surface side,
In the covering step, the sealing material is disposed on the opening of the deaeration port in the metal outer packaging material on the one surface side and on the opening of the degassing port in the metal outer packaging material on the other surface side, respectively. It is a process to mount. The manufacturing method of the vacuum heat insulating material of Claim 1 characterized by the above-mentioned. The sealing material is a member including an adhesion layer made of at least a thermoplastic resin,
The method of manufacturing a vacuum heat insulating material according to claim 1 or 2, wherein the closing step is a step of applying heat to the adhesion layer to adhere to the metal outer packaging material. In the decompression step, the metal outer packaging material provided with the deaeration port in a state in which the core material portion is accommodated is accommodated in a vacuum chamber, and the interior of the metal outer packaging material is decompressed.
The said closing process heats the said sealing material with the heat-sealing machine provided in the said vacuum chamber, makes it stick to the said metal outer packaging material, and closes the said deaeration port. The manufacturing method of the vacuum heat insulating material of description.   The vacuum heat insulating material produced by the manufacturing method of any one of Claim 1 to 4.

Images