JP2010060048A - Vacuum heat insulating core material, vacuum heat insulating material using the same, and method of manufacturing the vacuum heat insulating core maerial - Google Patents

Abstract

A core material for a vacuum heat insulating material that has high rigidity and does not require heating in production.
A glass wool in which a core material for vacuum heat insulating material 13 is covered with a jacket material 15 made of a laminate film, and short glass fibers are stacked in a thickness direction in a vacuum heat insulating material 10 in which the inside of the jacket material 15 is sealed under reduced pressure. 11 is a state in which a surface material 12 made of a nonwoven fabric is laminated on each of two opposing surfaces substantially perpendicular to the thickness direction in 11 and is subjected to needle punching to compress the glass wool 11 and the surface material 12 in the thickness direction. Then, the one integrated by warp fiber entanglement was used for the vacuum heat insulating material core 13. Thereby, the core material 13 for vacuum heat insulating materials provided with high rigidity is obtained. In addition, since heating is not required in production, energy (electric power or the like) for heating is not consumed, and the amount of carbon dioxide emission that is the cause of global warming can be reduced accordingly.
[Selection] Figure 1

Description

  The present invention relates to a vacuum heat insulating material core made of glass wool, a vacuum heat insulating material using the same, and a method for manufacturing a vacuum heat insulating material core.

  In recent years, energy saving of home appliances has become an important issue to be addressed urgently, while the suppression of global warming gas emissions has been called out. As one of these solutions, a vacuum heat insulating material having an excellent heat insulating performance has been developed for the purpose of preventing useless transfer of heat. A vacuum heat insulating material is an open-cell foamed resin or fiber material, which is covered with a barrier covering material and sealed inside under reduced pressure. Reduces conduction and improves thermal insulation performance.

  In such a vacuum heat insulating material, in order to further improve the heat insulating performance, it is known to apply glass fiber such as glass wool to the core material. Glass fiber such as glass wool is bulky and has poor handleability, and is processed into a mat-like core material by needle punching or hot pressing (see, for example, Patent Document 1 and Patent Document 2). ).

JP-A-7-96563 JP 2005-273696 A

  However, even if glass wool applied to the core material of the vacuum heat insulating material is subjected to needle punch processing, high rigidity as a core material cannot be obtained because the entanglement of warp fibers by the needle is weak. For this reason, there exists a problem that the productivity of a vacuum heat insulating material falls that handling property is bad.

  In addition, although high rigidity is obtained in the hot press processing, it is necessary to heat the glass wool to a temperature close to the strain point of the glass constituting the glass wool (about 480 ° C.) when compressing the glass wool. Etc.), the amount of carbon dioxide emission, which is the cause of global warming, is large.

  The present invention has been made in view of such circumstances, and has high rigidity, and does not require heating in production, a vacuum heat insulating material using the same, and a vacuum heat insulating material core material using the same It aims at providing the manufacturing method of.

  The core material for a vacuum heat insulating material according to the present invention is a core material for a vacuum heat insulating material, and includes a first material having a heat insulating action, and a planar second material covering at least one surface of the first material. The first material and the second material are integrated by warp fiber entanglement.

  According to the said structure, since the 2nd material is integrated by the entanglement of the 1st material and warp fiber, high rigidity is acquired.

  Moreover, the said structure WHEREIN: The entanglement of the said warp fiber is formed by needle punching.

  According to the above configuration, since heating is not required in the formation of the vacuum insulation core material, energy (electric power, etc.) for heating is not consumed in the manufacture, and this is considered to cause global warming. The amount of carbon dioxide emitted can be reduced.

  In the above configuration, the second material covers two opposing surfaces of the first material.

  According to the above configuration, since the second material is provided on each of the two surfaces of the first material, higher rigidity can be obtained.

  In the above structure, glass wool is desirable as the first material.

  In the above structure, a nonwoven fabric is desirable as the second material.

  Moreover, in the said structure, the glass wool which laminated | stacked the glass short fiber in the thickness direction was used as said 1st material, the nonwoven fabric was used as said 2nd material, and the said nonwoven fabric was substantially perpendicular to the thickness direction of the said glass wool. It is desirable to cover the surface.

  The vacuum heat insulating material of the present invention is a vacuum heat insulating material in which a core material is covered with a cover material made of a laminate film, and the inside of the cover material is sealed under reduced pressure, wherein the core material has a heat insulating action. A material and a planar second material covering at least one surface of the first material are provided, and the first material and the second material are integrated by warp fiber entanglement.

  According to the above configuration, in the core material, since the second material is integrated by entanglement of the first material and warp fibers, high rigidity is obtained.

  Moreover, the said structure WHEREIN: The entanglement of the said warp fiber is formed by the needle punch process.

  According to the above configuration, since heating is not required in the formation of the core material, there is no consumption of energy (electric power, etc.) for heating in the manufacturing process, and the amount of carbon dioxide, which is the cause of global warming, is correspondingly reduced. Emissions can be reduced.

  In the above configuration, the second material covers two opposing surfaces of the first material.

  According to the above configuration, since the second material is provided on each of the two surfaces of the first material, higher rigidity can be obtained.

  In the above structure, glass wool is desirable as the first material.

  In the above structure, a nonwoven fabric is desirable as the second material.

  Moreover, in the said structure, the glass wool which laminated | stacked the glass short fiber in the thickness direction was used as said 1st material, the nonwoven fabric was used as said 2nd material, and the said nonwoven fabric was substantially perpendicular to the thickness direction of the said glass wool. It is desirable to cover the surface.

  In the method for manufacturing a core material for vacuum heat insulating material according to the present invention, at least one surface of the first material having a heat insulating action is covered with a planar second material, and needle punching is performed to perform the first material and the first material. The core material for a vacuum heat insulating material is manufactured by integrating the two materials by entanglement of warp fibers.

  According to the above method, a vacuum insulation core material having high rigidity can be obtained, and heating is not required in its manufacture, so that energy (electric power, etc.) for heating is not consumed, and the earth The amount of carbon dioxide, which is the cause of global warming, can be reduced.

  According to the present invention, a core material for a vacuum heat insulating material having high rigidity is obtained, and heating is not required in the manufacture of the core material for a vacuum heat insulating material, so that energy (electric power, etc.) for heating is consumed. The amount of carbon dioxide, which is the cause of global warming, can be reduced accordingly.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a vacuum heat insulating material according to Embodiment 1 of the present invention. FIG. 2 is a view schematically showing a cross section of the vacuum heat insulating material core according to the present embodiment. 1 and 2, the vacuum heat insulating material 10 of the present embodiment is a non-woven fabric on each of two opposing surfaces substantially perpendicular to the thickness direction of the glass wool 11 in the glass wool 11 in which short glass fibers are stacked in the thickness direction. A mat-like core material for vacuum heat insulating material (hereinafter simply referred to as “core”, in which glass wool 11 and face material 12 are integrated in a compressed state in the thickness direction by needle punching. 13), an adsorbent 14 for moisture adsorption provided inside the core material 13, and an outer jacket material 15 made of a gas barrier laminate film surrounding the core material 13.

The glass wool 11 constituting the core material 13 is obtained by stacking short fibers of soda-lime glass having an average fiber diameter of 3.5 μm in the thickness direction, for example, and a weight per unit area of 1800 g / m ^{2 is} used. Further, the face material 12 constituting the core material 13 is a spunbond type nonwoven fabric made of polyester resin, and a basis weight of 30 g / m ^{2 is} used. Since the glass wool 11 before the needle punching is bulky with a density of about 30 kg / m ³ , the face material 12 is laminated on the two surfaces opposite to each other in the thickness direction, and then the needle is formed in the thickness direction from the outside of the face material 12. It is matted by punching. The density of the core 13 after needle punching is 186 kg / m ³ .

  The glass wool 11 and the face material 12 are needle punched together by a general-purpose needle punch device 20 shown in FIG. By this needle punching process, the glass fiber itself constituting the glass wool 11 becomes the warp fiber 30 (see also FIG. 2) and is entangled with other fibers, and the glass wool 11 is compressed and integrated. Furthermore, since the warp fibers 30 resulting from the glass wool 11 are also entangled with the face material 12 located on the surface of the glass wool 11, the face material 12 acts as an aggregate of the core material 13, and thus a rigid mat-like core material. Is obtained. Furthermore, since the nonwoven fabric which has a polyester resin as a main component is used as the face material 12, since a part of fiber which comprises the face material 12 is comprised as the warp fiber 30 of the core material 13, two surfaces The glass wool 11 sandwiched between the materials 12 is firmly restrained, and a core material 13 having high rigidity is obtained.

  In the needle punch device 20 shown in FIG. 3, the upper and lower two needle portions 21 reciprocate up and down, and the glass wool 11 and the face material 12 conveyed along the guide 22 are integrated by warp fiber interlacing. In this case, the direction indicated by the arrow A in the figure is the movement direction of the needle portion 21, and the direction indicated by the arrow B in the figure is the conveyance direction of the glass wool 11 and the face material 12.

  Returning to FIG. 1, the adsorbent 14 is, for example, calcium oxide. The outer cover material 15 includes a 6-nylon film having a thickness of 15 μm, a 6-nylon film having a thickness of 25 μm, an aluminum foil having a thickness of 6 μm, and an innermost layer having a thickness of 15 μm. This is a plastic laminate film in which polyethylene films with a thickness of 50 μm are bonded together with a urethane-based adhesive as a heat-welded layer. Two of these plastic laminate films are stacked so that the polyethylene films face each other, and the peripheral edge of the film is heated. Molded by welding.

  Next, the manufacturing method of the vacuum heat insulating material 10 of this Embodiment is demonstrated. FIG. 4 is a diagram illustrating a manufacturing process of the vacuum heat insulating material 10 of the present embodiment. In the figure, first, glass short fibers are stacked in the thickness direction to obtain glass wool 11 having a predetermined thickness ((a)). Subsequently, the face material 12 which consists of a nonwoven fabric is laminated | stacked on each of two mutually opposing surfaces substantially perpendicular | vertical to the thickness direction in the glass wool 11 ((b)). After the face material 12 is laminated on the glass wool 11, needle punching is performed ((c)). The core material 13 is obtained by this needle punching ((d)). Then, after the obtained core material 13 is dried, it is inserted into the bag-shaped outer covering material 15 together with the adsorbent 14 (not shown here). And it seals under reduced pressure with a vacuum packaging machine (illustration abbreviation) so that the inside of jacket material 15 may be 10 Pa or less ((e)). Thereby, the vacuum heat insulating material 10 is completed. At this time, since the core member 13 has sufficient rigidity for work, the workability such as insertion into the jacket material 15 is improved, and the productivity of the vacuum heat insulating material 10 can be improved.

About the vacuum heat insulating material 10 produced in this way, the thermal conductivity and the density of the core material 13 of the vacuum heat insulating material 10 were measured. It was measured at an average temperature of 24 ° C., and good results were obtained with a thermal conductivity of 0.0017 W / mK. Further, the thickness of the core material 13 which is the vacuum heat insulating material 10 and is compressed at atmospheric pressure is 8 mm, and the density of the core material after vacuum sealing calculated based on the weight of the core material before vacuum sealing is 233 kg / m ^3. Met.

  Thus, according to the present embodiment, in the vacuum heat insulating material 10 in which the core material 13 is covered with the envelope material 15 made of a laminate film and the inside of the envelope material 15 is sealed under reduced pressure, the core material 13 is made of short glass fiber. Glass wool 11 stacked in the thickness direction, and a surface material 12 made of non-woven fabric covering each of two opposing surfaces substantially perpendicular to the thickness direction of the glass wool 11, and the glass wool 11 and the surface material 12 are needle punched. Therefore, the core material 13 having high rigidity can be obtained. In addition, since heating is not required in the manufacture of the core material 13, energy (electric power or the like) for heating is not consumed, and the amount of carbon dioxide emission that is the cause of global warming can be reduced accordingly. Moreover, since a general purpose thing can be used as the glass wool used for the core material 13, a cost advantage is improved. Moreover, since the surface of the core material 13 (glass wool 11) is coat | covered with the face material 12, scattering of the dust of glass fiber can be reduced. Thereby, the heat seal quality can be further improved, and at the same time, the working environment can be improved.

  In the present embodiment, a resin film can be used as the face material 12, but a non-woven fabric made of a fiber material is more desirable. In addition, the nonwoven fabric can be made of either resin or glass, but is preferably one that generates less gas, and more preferably consists of a spunbond method, thermal bond method, needle punch method, and stitch bond method that do not use a binder. desirable. In addition, from the viewpoint of cost performance, it is preferably made of resin, and more preferably made of polyester.

In the present embodiment, the lengths of the individual needles of the needle portion 21 are all constant, and the entanglement of the warp fibers 30 penetrating the glass wool 11 from both face materials 12 as shown in FIG. 2 is formed. However, the entanglement of the warp fibers 30 may be changed as shown in FIGS. That is, as shown in FIG. 2, each needle of the upper and lower needle parts 21 penetrates from one face member 12 to the other face member 12 and passes up and down, so that the fiber is entangled and heat is easily transmitted, Since the heat insulating property is deteriorated, as shown in FIG. 5, each needle of the lower needle portion 21 penetrates from the lower face material 12 to the upper face material 12, but each needle of the upper needle portion 21 When piercing halfway in the thickness direction of the glass wool 11 from the face material 12 or when each hook needle of the upper and lower needle portions 21 is pierced halfway in the thickness direction of the glass wool 11 (longer than half the thickness of the glass wool 11) as shown in FIG. As described above, the heat insulation can be improved by reducing the entanglement of the fibers. In this case, since FIG. 6 has less fiber entanglement than FIG. 5, it can be said that FIG. 6 is superior in heat insulation. 5 and 6 are merely examples, and various other modes can be considered. Two or more core materials 13 may be laminated and used. Thereby, a thicker vacuum heat insulating material can be formed. Furthermore, although the core material 13 used glass wool having a basis weight of 1800 g / m ² , the basis weight can be arbitrarily changed according to the required thickness.

(Embodiment 2)
FIG. 7 is a sectional view showing a vacuum heat insulating material according to Embodiment 2 of the present invention. In this figure, parts common to those in FIG. 1 described above are denoted by the same reference numerals and description thereof is omitted.

  Although the vacuum heat insulating material 10 of Embodiment 1 mentioned above provided the face material 12 on each of both surfaces substantially perpendicular to the thickness direction of the glass wool 11 of the core material 13, the vacuum heat insulating material 40 of this Embodiment is as follows. A core material 41 provided with the face material 12 only on one surface substantially perpendicular to the thickness direction of the glass wool 11 is provided. By providing the face material 12 only on one surface substantially perpendicular to the thickness direction of the glass wool 11, the amount of the face material 12 used can be reduced, although the rigidity is inferior to the case of providing the face material 12 on both surfaces of the glass wool 11. Since the needle part 21 in the needle punch device 20 only needs to be provided on the face material 12 side, the cost can be reduced.

About the vacuum heat insulating material 40 of this Embodiment, the heat conductivity and the density of the core material 41 of the vacuum heat insulating material 40 were measured. It was measured at an average temperature of 24 ° C., and a good result was obtained with a thermal conductivity of 0.0015 W / mK. Moreover, the thickness of the core material 41 was 8 mm, and the density of the core material portion after vacuum sealing calculated based on the weight of the core material before vacuum sealing was 229 kg / m ³ . In addition, the density of the core material 41 before being sealed under reduced pressure was 174 kg / m ³ , which was about 10 kg / m ³ lower than that of the first embodiment, and became bulky. The workability at the time of manufacturing the vacuum heat insulating material 40 was not particularly deteriorated, and the core material 41 kept sufficient rigidity in the work.

  In the present embodiment, the face material 12 is provided on the surface of the glass wool 11, but may be provided inside the glass wool 11. Moreover, the number is arbitrary.

  The present invention provides a core material for vacuum heat insulating material having high rigidity, and does not require heating in the production of the core material, so there is no consumption of energy (electric power, etc.) for heating. It has the effect of reducing carbon dioxide emissions, which are considered to cause global warming, and can be applied to products in various fields such as home appliances, vehicles, and houses that require high thermal insulation performance. is there.

Sectional drawing which shows the vacuum heat insulating material which concerns on Embodiment 1 of this invention The figure which shows typically the cross section of the core material for vacuum heat insulating materials of the vacuum heat insulating material shown in FIG. The figure which shows typically the needle punch process in manufacture of the vacuum heat insulating material shown in FIG. The figure which shows the manufacturing process of the vacuum heat insulating material shown in FIG. The figure which shows typically the cross section of the application example of the core material for vacuum heat insulating materials shown in FIG. The figure which shows typically the cross section of the application example of the core material for vacuum heat insulating materials shown in FIG. Sectional drawing which shows the vacuum heat insulating material which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 40 Vacuum heat insulating material 11 Glass wool 12 Face material 13, 41 Core material for vacuum heat insulating materials 14 Adsorbent 15 Cover material 20 Needle punch apparatus 21 Needle part 22 Guide 30 Warp yarn fiber

Claims (13)

A vacuum insulation core material,
A first material having a heat insulating action;
A planar second material covering at least one surface of the first material,
The said 1st material and the said 2nd material are the core materials for vacuum heat insulating materials integrated by the entanglement of warp fiber.   The core material for a vacuum heat insulating material according to claim 1, wherein the entanglement of the warp fibers is formed by needle punching.   The core material for a vacuum heat insulating material according to claim 1 or 2, wherein the second material covers two opposing surfaces of the first material.   The core material for a vacuum heat insulating material according to any one of claims 1 to 3, wherein the first material is glass wool.   The core material for a vacuum heat insulating material according to any one of claims 1 to 4, wherein the second material is a nonwoven fabric.   The first material is glass wool in which short glass fibers are stacked in a thickness direction, the second material is a nonwoven fabric, and the nonwoven fabric covers a surface substantially perpendicular to the thickness direction of the glass wool. The core material for vacuum heat insulating materials according to claim 3. A vacuum heat insulating material in which the core material is covered with a jacket material made of a laminate film, and the inside of the jacket material is sealed under reduced pressure,
The core material is
A first material having a heat insulating action;
A planar second material covering at least one surface of the first material,
The first material and the second material are vacuum heat insulating materials integrated by warp fiber interlacing.   The vacuum heat insulating material according to claim 7, wherein the entanglement of the warp fibers is formed by needle punching.   The vacuum heat insulating material according to claim 7 or 8, wherein the second material covers two opposing surfaces of the first material.   The vacuum heat insulating material according to any one of claims 7 to 9, wherein the first material is glass wool.   The vacuum heat insulating material according to any one of claims 7 to 10, wherein the second material is a nonwoven fabric.   The first material is glass wool obtained by stacking short glass fibers in a thickness direction, the second material is a nonwoven fabric, and the nonwoven fabric covers a surface substantially perpendicular to the thickness direction of the glass wool. The vacuum heat insulating material according to any one of claims 9 to 9.   Covering at least one surface of the first material having a heat insulating action with the planar second material, performing needle punching, and integrating the first material and the second material by entanglement of warp fibers The manufacturing method of the core material for vacuum heat insulating materials which manufactures the core material for vacuum heat insulating materials.

Images