JP5309366B2 - Vacuum heat insulating material, heat insulating box, and manufacturing method of vacuum heat insulating material - Google Patents

Description

  The present invention relates to a vacuum heat insulating material, a heat insulating box, and a method for manufacturing a vacuum heat insulating material, in particular, a vacuum heat insulating material having a resin fiber assembly as a core material, a heat insulating box using the vacuum heat insulating material, and a vacuum heat insulating material. And a manufacturing method.

  Conventionally, a vacuum heat insulating material using a fiber assembly as a core material has been proposed. For example, Japanese Unexamined Patent Application Publication No. 2007-32622 (Patent Document 1) proposes a vacuum heat insulating material having a core material in which a waste material and a new material made of an inorganic fiber polymer not containing a binder are wrapped with an inner packaging material. Japanese Patent Laid-Open No. 2002-310384 (Patent Document 2) proposes a vacuum heat insulating material having a core material in which a reinforcing material and an inorganic fiber aggregate not including a binder for solidifying the fiber material are laminated. Has been.

JP 2007-32622 A JP 2002-310384 A

  In a vacuum heat insulating material using a fiber assembly as a core material, if the fiber bonding process for integrating the fiber assembly is not performed, the fibers may fray or fall off during manufacture. Handleability is significantly reduced.

  In Japanese Patent Application Laid-Open No. 2007-32622, since the waste material and the new material made of the inorganic fiber polymer are not hardened with the binder, the handling property when the waste material and the new material are wrapped in the inner packaging material is not improved. In Japanese Patent Laid-Open No. 2002-310384, since a binding material for solidifying a fiber material is not included, handling properties when inserting a reinforcing material and an inorganic fiber aggregate into an outer jacket material are not improved.

  Further, in order to improve the handling property of the core material made of the fiber assembly, fiber bonding processing for integrating the fiber assembly may be performed so as to maintain the shape of the core material made of the fiber assembly. . In this case, the fusion part between the fibers is formed so as to penetrate the core material. Since heat conduction increases at the fusion part between the fibers, the heat insulating performance of the vacuum heat insulating material is lowered.

  This invention is made | formed in view of said subject, The objective is providing the manufacturing method of a vacuum heat insulating material, a heat insulation box, and a vacuum heat insulating material with high handling property and heat insulation performance of a resin fiber aggregate. is there.

The vacuum heat insulating material of the present invention is a vacuum heat insulating material obtained by vacuum-sealing a resin fiber assembly, and the resin fiber assembly has a glass transition temperature higher than that of the first fiber assembly and the resin material constituting the first fiber assembly. And a second fiber aggregate composed of a low crystalline resin material, and the second fiber aggregate is thermally fused to the first fiber aggregate.

The method for manufacturing a vacuum heat insulating material according to the present invention is a method for manufacturing a vacuum heat insulating material in which a resin fiber assembly is vacuum-sealed, and includes a first fiber assembly of the resin fiber assembly and a resin constituting the first fiber assembly. In the process of laminating a second fiber aggregate composed of a crystalline resin material having a glass transition temperature lower than that of the material, and in a state where the first fiber aggregate and the second fiber aggregate are laminated, the first fiber A step of integrating the first fiber aggregate and the second fiber aggregate by thermally fusing the second fiber aggregate to the aggregate.

  According to the present invention, the second fiber assembly composed of a resin material having a glass transition temperature lower than that of the resin material constituting the first fiber assembly is thermally fused to the first fiber assembly. The handling property of the resin fiber assembly can be enhanced by integrating the first fiber assembly and the second fiber assembly. In addition, since the first fiber aggregate does not penetrate through heat fusion, the heat insulation performance of the resin fiber aggregate can be enhanced.

It is a schematic sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention. It is a schematic sectional drawing of the resin fiber assembly in Embodiment 1 of this invention. It is a figure which shows schematically the manufacturing method of the vacuum heat insulating material in Embodiment 1 of this invention. It is a figure which shows roughly the manufacturing method of the vacuum heat insulating material in the modification 1 of Embodiment 1 of this invention. It is a figure which shows roughly the manufacturing method of the vacuum heat insulating material in the modification 2 of Embodiment 1 of this invention. It is a figure which shows schematically the manufacturing method of the vacuum heat insulating material in Embodiment 2 of this invention. It is a figure which shows schematically the manufacturing method of the vacuum heat insulating material in Embodiment 3 of this invention. It is a schematic sectional drawing of the heat insulation box in Embodiment 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the configuration of the vacuum heat insulating material according to Embodiment 1 of the present invention will be described.

  Referring to the drawing, the vacuum heat insulating material 10 mainly includes a core material 2 having a plurality of resin fiber assemblies 1, a moisture adsorbent 3, and an outer packaging material 4.

  A core material 2 having a plurality of resin fiber assemblies 1 and a moisture adsorbent 3 are inserted into the outer packaging material 4. The inside of the outer packaging material 4 is decompressed. Thereby, the vacuum heat insulating material 10 is comprised so that the resin fiber assembly 1 may be vacuum-sealed. The inside of the outer packaging material 4 is decompressed to a degree of vacuum of, for example, several Pa (Pascal). The opening of the outer packaging material 4 is bonded by heat sealing. The outer packaging material 4 has, for example, a metal foil layer having a thickness of about 6 μm and a thermoplastic polymer layer. The outer packaging material 4 has gas barrier properties.

  The core material 2 is configured to support the atmospheric pressure in the vacuum heat insulating material 10 and secure a space in the vacuum heat insulating material 10. The core material 2 is a laminate of a plurality of resin fiber assemblies 1. The core material 2 is not limited to the plurality of resin fiber assemblies 1, and may consist of one resin fiber assembly 1. The moisture adsorbent 3 is configured to suppress deterioration with time of the vacuum degree of the vacuum heat insulating material 10 by adsorbing moisture inside the outer packaging material 4. The moisture adsorbent 3 is composed of CaO (calcium oxide) inserted in a breathable bag.

  With reference to FIG. 2, the resin fiber assembly 1 has a first fiber assembly 1a and a second fiber assembly 1b. The 2nd fiber aggregate 1b is comprised with the resin material whose glass transition temperature is lower than the resin material which comprises the 1st fiber aggregate 1a. The second fiber assembly 1b is heat-sealed to the first fiber assembly 1a. The first fiber assembly 1 a and the second fiber assembly 1 b are integrated by the heat-sealing part 5. The heat sealing | fusion part 5 penetrates the 2nd fiber assembly 1b, and is comprised so that it may melt | fuse with the interface of the 1st fiber assembly 1a.

  The second fiber assembly 1b is in contact with both the one surface of the first fiber assembly 1a and the other surface opposite to the one surface. The second fiber assembly 1b may be in contact with only one surface of the first fiber assembly 1a.

  The first fiber assembly 1a may be made of PET (polyethylene terephthalate) having a glass transition temperature of 70 ° C., for example. The second fiber assembly 1b may be made of PP (polypropylene) having a glass transition temperature of −20 ° C., for example. In addition, the combination of the resin fiber which comprises the 1st fiber assembly 1a and the 2nd fiber assembly 1b is not limited to this, The 2nd fiber assembly is based on the glass transition temperature of the resin material which comprises the 1st fiber assembly 1a. The resin material which has the relationship with the low glass transition temperature of the resin material which comprises the body 1b should just be applied.

Next, the manufacturing method of the vacuum heat insulating material of this Embodiment is demonstrated.
With reference to FIG. 3, the fibers spun from the second fiber spinning device 7 c of the spinning device 7 are collected on the conveyor 6. A second fiber assembly 1b is formed by the fibers spun from the second fiber spinning device 7c and collected on the conveyor 6. The second fiber assembly 1b is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. The fibers spun from the first fiber spinning device 7 a of the spinning device 7 are collected on the second fiber assembly 1 b placed on the conveyor 6. A first fiber assembly 1 a is formed by fibers spun from the first fiber spinning device 7 a and collected on the second fiber assembly 1 a placed on the conveyor 6. The first fiber assembly 1a is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Thereby, the 1st fiber assembly 1a and the 2nd fiber assembly 1b comprised by the resin material whose glass transition temperature is lower than the resin material which comprises the 1st fiber assembly 1a are laminated | stacked.

  The fibers spun from the second fiber spinning device 7 b of the spinning device 7 are collected on the first fiber assembly 1 a placed on the conveyor 6. A second fiber assembly 1b is formed by fibers spun from the second fiber spinning device 7b and collected on the first fiber assembly 1a. The second fiber assembly 1b is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Thereby, the first fiber assembly 1a and the second fiber assembly 1b are laminated with the first fiber assembly 1a sandwiched between the second fiber assemblies 1b.

  The first fiber assembly 1a and the second fiber assembly 1b are formed by the conveyor 6 toward the embossed heat roller 8 in a state where the first fiber assembly 1a is sandwiched and stacked between the second fiber assemblies 1b. It is conveyed in the direction of arrow A in the figure. The embossing heat roller 8 is configured to heat-fuse the second fiber aggregate 1b, and is set to a temperature at which the first fiber aggregate 1a does not melt and the second fiber aggregate 1b melts. For example, the temperature of the embossed heat roller 8 may be set to 120 degrees. The temperature of the embossing heat roller 8 is not limited to this, and may be a temperature at which only the second fiber assembly 1b can be heat-sealed.

  The embossed heat roller 8 has two rollers, one roller 8a rotating in the direction of arrow B in the figure, and the other roller 8b rotating in the direction of arrow C in the figure. In a state where the first fiber assembly 1a and the second fiber assembly 1b are laminated, the embossed heat roller 8 is passed between the rollers 8a and 8b. The heat fusion passes through the second fiber assembly 1b made of a resin material having a glass transition temperature lower than that of the resin material constituting the first fiber assembly 1a, and reaches the interface of the first fiber assembly 1a. Wear is given. On the other hand, the interface of the first fiber assembly 1a is fused by the melted second fiber assembly 1b, but the temperature of the embossing heat roller 8 is set to a temperature at which the first fiber assembly 1a is not melted. The fusion does not penetrate through the first fiber assembly 1a. In this way, the second fiber assembly 1b is heat-sealed to the first fiber assembly 1a. Thereby, the 2nd fiber assembly 1b is heat-sealed on both surfaces of the 1st fiber assembly 1a, and the 1st fiber assembly 1a and the 2nd fiber assembly 1b are integrated.

  In the manufacturing method of the vacuum heat insulating material 10 described above, the spinning of the first fiber assembly 1a and the second fiber assembly 1b and the integration of the spun first fiber assembly 1a and the second fiber assembly 1b are continuous. Done. Moreover, you may increase the ratio of the 1st fiber assembly 1a in the resin fiber assembly 1 rather than the ratio of the 2nd fiber assembly 1b.

  The resin fiber assembly 1 in which the first fiber assembly 1a and the second fiber assembly 1b are integrated is wound up by a winding roller 9 that rotates in the direction of arrow D in the figure. The resin fiber assembly 1 taken up by the take-up roller 9 is cut into an arbitrary size.

  Referring to FIG. 1, a plurality of resin fiber assemblies 1 are inserted into an outer packaging material 4 together with a moisture adsorbent 3. The inside of the outer packaging material 4 is decompressed, and the opening of the outer packaging material 4 is bonded by heat sealing. Thereby, the resin fiber assembly 1 is vacuum-sealed on the outer packaging material 4. A vacuum heat insulating material 10 is formed by vacuum-sealing the resin fiber assembly 1 on the outer packaging material 4.

Then, the manufacturing method of the vacuum heat insulating material of the modification 1 of this Embodiment is demonstrated.
The method for manufacturing a vacuum heat insulating material according to Modification 1 of the present embodiment is mainly different from the method for manufacturing a vacuum heat insulating material in that the second fiber spinning device 7c is not provided.

  With reference to FIG. 4, in the method for manufacturing a vacuum heat insulating material according to the first modification of the present embodiment, fibers spun from the first fiber spinning device 7 a of the spinning device 7 are collected on the conveyor 6. A first fiber assembly 1 a is formed by fibers spun from the first fiber spinning device 7 a and collected on the conveyor 6. The first fiber assembly 1a is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure.

  The fibers spun from the second fiber spinning device 7 b of the spinning device 7 are collected on the first fiber assembly 1 a placed on the conveyor 6. A second fiber assembly 1b is formed by fibers spun from the second fiber spinning device 7b and collected on the first fiber assembly 1a. The second fiber assembly 1b is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Thereby, the 1st fiber assembly 1a and the 2nd fiber assembly 1b comprised by the resin material whose glass transition temperature is lower than the resin material which comprises the 1st fiber assembly 1a are laminated | stacked.

  In a state where the first fiber assembly 1a and the second fiber assembly 1b are laminated, the second fiber is passed between the rollers 8a and 8b of the embossing heat roller 8 and the second fiber assembly 1a. The assembly 1b is heat-sealed. Thereby, the 2nd fiber assembly 1b is heat-seal | fused to the single side | surface of the 1st fiber assembly 1a, and the 1st fiber assembly 1a and the 2nd fiber assembly 1b are integrated. In addition, since the manufacturing method other than this is the same as the manufacturing method of said vacuum heat insulating material, the same code | symbol is attached | subjected about the same element and the description is not repeated.

Then, the manufacturing method of the vacuum heat insulating material of the modification 2 of this Embodiment is demonstrated.
In the manufacturing method of the vacuum heat insulating material of the modification 1 of this Embodiment, compared with the manufacturing method of said vacuum heat insulating material, it does not have the 1st fiber spinning apparatus 7a, but the 1st fiber-bonding process was carried out. This is mainly different in that the fiber assembly 1a has a rotary roll 10a wound up.

  Referring to FIG. 5, the fibers spun from the second fiber spinning device 7 c of the spinning device 7 are collected on the conveyor 6. A second fiber assembly 1b is formed by the fibers spun from the second fiber spinning device 7c and collected on the conveyor 6. The second fiber assembly 1b is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure.

  The first fiber assembly 1a is fiber-bonded. The first fiber assembly 1a subjected to the fiber bonding process is wound around the rotary roll 10a. The first fiber assembly 1a fiber-bonded from the rotating roll 10a is unwound in the direction of arrow E in the figure on the second fiber assembly 1a placed on the conveyor 6. The first fiber assembly 1a subjected to the fiber bonding process is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Thereby, the 1st fiber assembly 1a fiber-bonded and the 2nd fiber assembly 1b comprised by the resin material whose glass transition temperature is lower than the resin material which comprises the 1st fiber assembly 1a are laminated | stacked.

  The fibers spun from the second fiber spinning device 7b of the spinning device 7 are collected on the first fiber aggregate 1a subjected to fiber bonding and placed on the conveyor 6. A second fiber assembly 1b is formed by the fibers collected on the first fiber assembly 1a spun from the second fiber spinning device 7b and subjected to fiber bonding. The second fiber assembly 1b is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. As a result, the first fiber assembly 1a and the second fiber assembly 1b that have been subjected to fiber bonding are stacked such that the first fiber assembly 1a that has been subjected to fiber bonding is sandwiched between the second fiber assemblies 1b.

  In a state where the first fiber assembly 1a and the second fiber assembly 1b that have been subjected to fiber bonding are stacked, the first fiber assembly that has been subjected to fiber bonding by passing between the rollers 8a and 8b of the embossed heat roller 8 The second fiber assembly 1b is heat-sealed to the fiber assembly 1a. As a result, the second fiber assembly 1b is heat-sealed to both surfaces of the fiber-bonded first fiber assembly 1a, so that the fiber-bonded first fiber assembly 1a and the second fiber assembly 1b Integrated. In addition, since the manufacturing method other than this is the same as the manufacturing method of said vacuum heat insulating material, the same code | symbol is attached | subjected about the same element and the description is not repeated.

  As the fiber bonding process, a “thermal bond method” in which bonding is performed by heat such as an embossing roller is common, but the fiber bonding process in the present embodiment is not limited to the “thermal bond method”. "Chemical bond method" that is bonded by an adhesive, "needle punch method" that is mechanically bonded by sticking a needle with a barb, "span lace method" in which fibers are entangled by a high-pressure water stream, and "steam jet" that is bonded by heated steam Any method that can bind the fibers and obtain the same effect may be used.

  In addition, as a manufacturing method of the vacuum heat insulating material 10 of this Embodiment, the fiber which spins the resin material which comprises the fiber spun from the 2nd fiber spinning apparatus 7c shown in FIG. 3 from the 2nd fiber spinning apparatus 7b is shown. It is good also as a resin material different from the resin material which comprises. And the 1st fiber assembly 1a and the 2nd fiber assembly 1b are integrated by the embossing heat roller 8 set to the temperature which the 2nd fiber assembly 1b fuse | melts, and it is wound up by the winding roller 9 Also good.

Next, the effect of this Embodiment is demonstrated.
According to the vacuum heat insulating material 10 of this Embodiment, the 2nd fiber assembly comprised with the resin material whose glass transition temperature is lower than the resin material which comprises the 1st fiber assembly 1a with respect to the 1st fiber assembly 1a. Since the body 1b is heat-sealed, the heat-sealing part 5 is formed until it penetrates the second fiber assembly 1b and reaches the interface of the first fiber assembly 1a. Thereby, the 2nd fiber assembly 1b is firmly heat-sealed. Therefore, on the second fiber assembly 1b side of the resin fiber assembly 1, fraying and dropping of the fibers can be suppressed.

  Moreover, since the fraying and dropping of the fibers can be suppressed on the second fiber assembly 1b side, the fraying and dropping of the fibers can also be suppressed as the entire resin fiber assembly 1. For example, after winding up the resin fiber assembly 1 integrated by the heat-sealing part 5 with the winding roller 9, it is possible to prevent the fibers from fraying or dropping off when being rewound to cut out to the required size. can do. Further, when the resin fiber assembly 1 is inserted into the outer packaging material 4, it is possible to prevent the fibers from fraying or falling off. Therefore, the handling property of the resin fiber assembly 1 can be increased.

  On the other hand, since the first fiber assembly 1a is made of a resin material having a glass transition temperature higher than that of the second fiber assembly 1b, the heat fusion part 5 fuses the interface of the first fiber assembly 1a. It does not penetrate the first fiber assembly 1a. Therefore, since the penetration of heat fusion does not occur inside the first fiber assembly 1a, it is possible to suppress a decrease in heat insulation performance. Thereby, the heat insulation performance of the resin fiber assembly 1 can be enhanced.

  In addition, the second fiber assembly 1b may be in contact with both the one surface of the first fiber assembly 1a and the other surface opposite to the one surface. Thereby, since it can suppress that the fiber frays and drops off on both surfaces of the resin fiber assembly 1, the handling property can be further enhanced.

  Moreover, the 2nd fiber assembly 1b may be heat-sealed only to the single side | surface of the 1st fiber assembly 1a. Thereby, since the 2nd fiber assembly 1b is heat-seal | bonded only to the single side | surface of the 1st fiber assembly 1a, the production efficiency including production cost can be improved.

  Moreover, the 1st fiber assembly 1a may be fiber-bonded. Thereby, the 1st fiber assembly 1a manufactured with another line including the purchased goods can be used. Therefore, the manufacturing freedom can be improved.

  According to the method for manufacturing a vacuum heat insulating material of the present embodiment, the first fiber assembly 1a of the resin fiber assembly 1 and a resin material having a glass transition temperature lower than that of the resin material constituting the first fiber assembly 1a. The second fiber assembly 1b thus formed is laminated. The first fiber assembly 1a and the second fiber assembly 1b are passed through the embossed heat roller 8 in a stacked state. The embossing heat roller 8 is set to a temperature at which the second fiber assembly 1b is melted and is not melted. Therefore, heat fusion is performed so that the heat fusion passes through the second fiber assembly 1b and reaches the interface of the first fiber assembly 1a. In this way, the second fiber assembly 1b is heat-sealed to the first fiber assembly 1a. Thereby, on the second fiber assembly 1b side of the resin fiber assembly 1, it is possible to manufacture the resin fiber assembly 1 capable of suppressing fraying and dropping of the fibers.

  Moreover, since the fraying and dropping of the fibers can be suppressed on the second fiber assembly 1b side, the resin fiber assembly 1 that can suppress the fraying and dropping of the fibers can be manufactured as the entire resin fiber assembly 1. Therefore, the resin fiber assembly 1 having high handling properties can be manufactured.

  On the other hand, the interface of the first fiber assembly 1a is fused, but heat fusion is not performed until it penetrates the first fiber assembly 1a. Therefore, since the penetration of heat fusion does not occur in the first fiber assembly 1a, it is possible to suppress a decrease in heat insulation performance. Thereby, the resin fiber assembly 1 with high heat insulation can be manufactured.

  Further, since the spinning of the first fiber assembly 1a and the second fiber assembly 1b and the integration of the spun first fiber assembly 1a and the second fiber assembly 1b can be performed continuously, production is possible. Can be improved.

  Moreover, you may increase the ratio of the 1st fiber assembly 1a in the resin fiber assembly 1 rather than the ratio of the 2nd fiber assembly 1b. Thereby, since the ratio for which the volume of the heat-fusion part 5 of the 2nd fiber assembly 1b accounts to the volume of the resin fiber assembly 1 can be reduced relatively, the fall of the heat insulation performance of the resin fiber assembly 1 is further reduced. Can be suppressed.

(Embodiment 2)
In the manufacturing method of the vacuum heat insulating material 10 of Embodiment 2 of this invention, compared with the manufacturing method of the vacuum heat insulating material 10 of Embodiment 1, it does not have the 2nd fiber spinning apparatus 7b, 7c, and a fiber This is mainly different in that the second fiber assembly 1b subjected to the bonding process has the rotating rolls 10b and 10c wound up.

  Referring to FIG. 6, the second fiber assembly 1b is fiber-bonded. The second fiber assembly 1b subjected to the fiber bonding process is wound around the rotary roll 10c. The second fiber assembly 1b subjected to fiber bonding from the rotating roll 10c is unwound on the conveyor 6 in the direction of arrow G in the figure. The second fiber assembly 1b subjected to the fiber bonding process is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure.

  The fibers spun from the first fiber spinning device 7 a of the spinning device 7 are collected on the second fiber assembly 1 b subjected to fiber bonding and placed on the conveyor 6. The first fiber assembly 1a is formed by the fibers collected on the second fiber assembly 1b spun from the first fiber spinning device 7a and subjected to fiber bonding processing. The first fiber assembly 1a is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Thereby, the 1st fiber assembly 1a and the 2nd fiber assembly 1b comprised by the resin material whose glass transition temperature is lower than the resin material which comprises the 1st fiber assembly 1a, and fiber-bonding-processed are laminated | stacked.

  The second fiber assembly 1b fiber-bonded from the rotary roll 10b is unwound in the direction of arrow F in the figure on the first fiber assembly 1a placed on the conveyor 6. The second fiber assembly 1b subjected to the fiber bonding process is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Accordingly, the first fiber assembly 1a and the second fiber assembly 1b subjected to the fiber bonding process are sandwiched and stacked by the second fiber assembly 1b in which the first fiber assembly 1a is subjected to the fiber bonding process. .

  In a state where the first fiber assembly 1a and the second fiber assembly 1b subjected to fiber bonding are laminated, the embossed heat roller 8 is passed between the roller 8a and the roller 8b and is passed through the first fiber assembly 1a. On the other hand, the second fiber assembly 1b subjected to fiber bonding is heat-sealed. As a result, the second fiber assembly 1b subjected to the fiber bonding process on both surfaces of the first fiber assembly 1a is heat-sealed, and the first fiber assembly 1a and the second fiber assembly 1b subjected to the fiber bonding process are obtained. Integrated. In addition, since the manufacturing method other than this is the same as the manufacturing method of said vacuum heat insulating material 10, the same code | symbol is attached | subjected about the same element and the description is not repeated.

  According to the manufacturing method of the vacuum heat insulating material 10 of this Embodiment, since the 2nd fiber assembly 1b is fiber-bonded, use the 2nd fiber assembly 1b manufactured with another line also including the purchased goods. Can do. Therefore, the manufacturing freedom can be improved.

(Embodiment 3)
In the manufacturing method of the vacuum heat insulating material 10 of Embodiment 2 of this invention, compared with the manufacturing method of the vacuum heat insulating material 10 of Embodiment 1, 1st fiber spinning apparatus 7a and 2nd fiber spinning apparatus 7b, 7c are used. The rotating roll 10a is wound around the first fiber assembly 1a that has been fiber-bonded and the rotating rolls 10b and 10c are wound around the second fiber assembly 1b that has been fiber-bonded. Mainly different in that.

  Referring to FIG. 7, the second fiber assembly 1b is fiber-bonded. The second fiber assembly 1b subjected to the fiber bonding process is wound around the rotary roll 10c. The second fiber assembly 1b subjected to fiber bonding from the rotating roll 10c is unwound on the conveyor 6 in the direction of arrow G in the figure. The second fiber assembly 1b subjected to the fiber bonding process is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure.

  The first fiber assembly 1a is fiber-bonded. The first fiber assembly 1a subjected to the fiber bonding process is wound around the rotary roll 10a. The first fiber assembly 1a fiber-bonded from the rotating roll 10a is unwound in the direction of arrow E in the figure on the fiber-bonded second fiber assembly 1a placed on the conveyor 6. The first fiber assembly 1a subjected to the fiber bonding process is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Accordingly, the first fiber assembly 1a subjected to fiber bonding, and the second fiber assembly 1b formed from a resin material having a glass transition temperature lower than that of the resin material constituting the first fiber assembly 1a and subjected to fiber bonding. Are stacked.

  The second fiber assembly 1b that has been fiber bonded from the rotating roll 10b is unwound in the direction of arrow F in the figure on the first fiber assembly 1a that has been fiber bonded and placed on the conveyor 6. The second fiber assembly 1b subjected to the fiber bonding process is conveyed by the conveyor 6 at an arbitrary speed in the direction of arrow A in the figure. Thus, the first fiber aggregate 1a subjected to fiber bonding and the second fiber aggregate 1b subjected to fiber bonding are the second fibers obtained by fiber bonding the first fiber aggregate 1a subjected to fiber bonding. They are sandwiched and stacked between the aggregates 1b.

  In a state where the first fiber assembly 1a subjected to fiber bonding and the second fiber assembly 1b subjected to fiber bonding are laminated, the fiber bonding is performed between the rollers 8a and 8b of the embossed heat roller 8. The second fiber assembly 1b that has been fiber-bonded to the processed first fiber assembly 1a is heat-sealed. As a result, the second fiber assembly 1b that has been fiber bonded to both surfaces of the first fiber assembly 1a that has been fiber bonded is thermally fused, and the first fiber assembly 1a that has been fiber bonded and the fiber bonding process. The second fiber assembly 1b thus formed is integrated. In addition, since the manufacturing method other than this is the same as the manufacturing method of said vacuum heat insulating material 10, the same code | symbol is attached | subjected about the same element and the description is not repeated.

  According to the manufacturing method of the vacuum heat insulating material 10 of this Embodiment, since the 1st fiber assembly 1a and the 2nd fiber assembly 1b which were fiber-bonded are fiber-bonded, it is a separate line including a purchased item. The manufactured first fiber assembly 1a and second fiber assembly 1b can be used. Therefore, the manufacturing freedom can be further improved.

(Embodiment 4)
The vacuum heat insulating material 10 according to the fourth embodiment of the present invention is mainly different from the vacuum heat insulating material 10 according to the first embodiment in that the fibers of the second fiber assembly 1b are made of a crystalline resin material. Is different.

  With reference to FIG. 1 and FIG. 2, in the vacuum heat insulating material 10 of this Embodiment, the fiber of the 1st fiber assembly 1a is comprised with the amorphous resin material, and the fiber of the 2nd fiber assembly 1b Is made of a crystalline resin material.

  For example, the first fiber assembly 1a is made of PS (polystyrene) having a glass transition temperature of 100 ° C., and the second fiber assembly 1b is made of PP (polypropylene) having a glass transition temperature of −20 ° C. Also good. The resin fiber assembly 1 is obtained by integrating the first fiber assembly 1a and the second fiber assembly 1b by heat fusion with the embossing heat roller 8 set at a temperature of 120 ° C. In addition, the combination of the resin material of the 1st fiber assembly 1a and the 2nd fiber assembly 1b, and the temperature of the embossing heat roller 8 are not limited to this.

  Since the other configuration and the manufacturing method are the same as those in the first embodiment, the same elements are denoted by the same reference numerals, and the description thereof will not be repeated.

  In the resin fiber assembly 1 made only of the non-crystalline resin material, the fiber contracts due to heat received from the outside of the outer packaging material 4 and the heat insulation performance is lowered. As this heat, for example, there is heat generated when urethane foam for fixing the vacuum heat insulating material is filled in the refrigerator outer shell.

  According to the vacuum heat insulating material 10 of the present embodiment, since the fibers of the second fiber assembly 1b are made of a crystalline resin material, the second fiber assembly 1b does not contract the fibers due to heat. And since the 2nd fiber assembly 1b fulfill | performs the interruption | blocking function of heat, the heat transfer to the 1st fiber assembly 1a can be prevented. Thereby, since the shrinkage | contraction by the heat | fever of the 1st fiber assembly 1a which consists of an amorphous resin material can be prevented, the fall of the heat insulation performance of the resin fiber assembly 1 can further be suppressed.

(Embodiment 5)
First, the configuration of the heat insulation box according to the fifth embodiment of the present invention will be described.

  With reference to FIG. 8, the heat insulation box 20 of this Embodiment has mainly the vacuum heat insulating material 10, the inner box 21, the outer box 22, and the urethane foam heat insulating material 23. FIG.

  In the heat insulation box 20, the vacuum heat insulating material 10 according to any of Embodiments 1 to 4 is disposed between the inner box 21 and the outer box 22. A urethane foam heat insulating material 23 is disposed in a space other than the vacuum heat insulating material 10 in the space between the inner box 21 and the outer box 22.

  In the configuration shown in FIG. 8, the vacuum heat insulating material 10 is in close contact with the inner box 21, but the configuration of the heat insulating box 20 is not limited to the configuration shown in FIG. For example, the vacuum heat insulating material 10 may be in close contact with the outer box 22. Further, the vacuum heat insulating material 10 may be disposed between the inner box 21 and the outer box 22 using a spacer or the like.

  Moreover, in the structure shown in FIG. 8, although the foaming urethane heat insulating material 23 is arrange | positioned in spaces other than the vacuum heat insulating material 10 in the space between the inner box 21 and the outer box 22, the structure of the heat insulating box 20 is a figure. The configuration shown in FIG. For example, a heat insulating material other than urethane foam may be disposed. Further, the vacuum heat insulating material 10 may be disposed in all the spaces between the inner box 21 and the outer box 22.

  As mentioned above, according to this Embodiment, since the heat insulation box 20 is equipped with the vacuum heat insulating material 10 in any one of Embodiment 1-4, it has the same effect as any in Embodiment 1-4. .

  According to this Embodiment, since the vacuum heat insulating material 10 can suppress the fall of heat insulation performance, the heat insulation box 20 can implement | achieve the outstanding heat insulation.

  In addition, the manufacturing method of the resin fiber assembly 1 is not limited to the method of manufacturing continuously by the conveyor 6 and the spinning device 7. Also realized by a manufacturing method such as batch processing, in which the resin fiber assembly 1 manufactured intermittently by a wet method or the like that manufactures the resin fiber assembly 1 by treating the fiber like paper is integrated by heat fusion can do.

The above embodiments can be combined in a timely manner.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Resin fiber assembly, 2 core material, 3 moisture adsorption agent, 4 outer packaging material, 5 heat-sealing part, 6 conveyor, 7 spinning apparatus, 7a 1st fiber spinning apparatus, 7b 2nd fiber spinning apparatus, 7c 2nd fiber Spinning device, 8 embossed heat roller, 8a, 8b roller, 9 take-up roller, 10 vacuum heat insulating material, 10a, 10b, 10c rotating roll, 20 heat insulating box, 21 inner box, 22 outer box, 23 urethane foam heat insulating material.

Claims (8)

A vacuum heat insulating material obtained by vacuum-sealing a resin fiber assembly,
The resin fiber assembly is
A first fiber assembly;
A second fiber aggregate composed of a crystalline resin material having a glass transition temperature lower than that of the resin material constituting the first fiber aggregate;
A vacuum heat insulating material configured by thermally fusing the second fiber assembly to the first fiber assembly.   2. The vacuum heat insulating material according to claim 1, wherein the second fiber assembly is configured to come into contact with both one surface of the first fiber assembly and the other surface opposite to the one surface.   The vacuum heat insulating material according to claim 1 or 2, wherein the first fiber assembly is subjected to fiber bonding.   The vacuum heat insulating material in any one of Claims 1-3 by which the said 2nd fiber assembly is fiber-bonded. The vacuum heat insulating material in any one of Claims 1-4 with which the fiber of the said 1st fiber assembly is comprised with the amorphous resin material.   The heat insulation box provided with the vacuum heat insulating material in any one of Claims 1-5. A method for producing a vacuum heat insulating material in which a resin fiber assembly is hermetically sealed,
Laminating a first fiber aggregate of the resin fiber aggregate and a second fiber aggregate composed of a crystalline resin material having a glass transition temperature lower than that of the resin material constituting the first fiber aggregate; ,
In the state where the first fiber assembly and the second fiber assembly are laminated, the first fiber assembly is thermally fused to the first fiber assembly, thereby the first fiber assembly. And a process for integrating the second fiber assembly. A method for manufacturing a vacuum heat insulating material.   The manufacturing method of the vacuum heat insulating material of Claim 7 further equipped with the process of giving a fiber bond process to a said 2nd fiber assembly.

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