KR20060113436A - Vacuum heat insulation material and method for production thereof - Google Patents

Abstract

A vacuum insulating material and a manufacturing method thereof are provided to increase the insulating performance by attaching the pipe and installing the vacuum insulating material. A vacuum insulating material is composed of a core(2) received at a sealing body comprising a gas barrier film having a heat welding layer; and a vacuum insulating material(1) whose inner side is decompressed/sealed. The no-welding unit of the sealing body is heat-welded by heating the whole part or a part of the no-welding part under the constant pressure. The core has a penetration hole or a notch, or a penetration hole and a notch. The cutting line is formed at the end of the perimeter of the periphery edge unit at the center of the penetration hole.

Description

Vacuum Insulation Material and its Manufacturing Method {VACUUM HEAT INSULATION MATERIAL AND METHOD FOR PRODUCTION THEREOF}

1 is a plan view of a vacuum insulating material produced by a conventional method used in the present invention,

FIG. 2 is a partially enlarged side view illustrating a state in which the circumferential edge portion of the vacuum insulation material shown in FIG. 1 is folded into the core material side;

3 is a partially enlarged perspective view showing a state before folding the other peripheral edge portion of the vacuum insulating material shown in Figure 2 to the core material side,

FIG. 4 is a perspective view of the periphery of the core portion corner portion of the vacuum insulation material shown in FIG.

FIG. 5 is a partially cutaway perspective view of the upper surface side around the core material corner portion shown in FIG. 4;

6 is a perspective view showing an example of a method of manufacturing a vacuum insulator of the present invention by total heating;

7 is a plan view showing an example of the manufacturing process of the vacuum insulating material of the present invention,

8 is a plan view showing another example of the manufacturing process of the vacuum insulating material of the present invention,

9 is a plan view of an example of a vacuum insulator using a core having a circular through hole at its center;

10 is a plan view of another example of a vacuum insulator using a core member having a circular through hole at its center;

11 is a plan view of an example of a vacuum insulator using a core member having a notch at the side portions;

12 is a plan view of an example of a vacuum insulator using a core having a through hole in the form of a keyhole,

13 is a plan view of an example of a vacuum insulator using a core member having a rectangular through hole in a central portion thereof;

14 is a plan view of another example of a vacuum insulator using a core member having a rectangular through hole at its center;

15 is a plan view of an example of a vacuum insulator using a core having an approximately L-shaped plane;

FIG. 16 is a plan view showing an example of a manufacturing process of a vacuum insulator using a core having a complicated shape, in which FIG. 16 (a) shows a vacuum insulator heat-sealed at its edges, and FIG. 16 (b) heats the entire vacuum insulator under normal pressure. One vacuum heat insulating material, FIG. 16 (c) shows a vacuum heat insulating material obtained by cutting a gas-welded gas barrier film along a core material.

<Description of the code>

1, 7, 9, 11, 13, 15, 17, 19, 21, 23: vacuum insulation

3: gas barrier film 4: bending line

2, 8, 10, 12, 14, 16, 18, 20, 22: heartwood

5: dryer

6: hot air blower

F: exterior encapsulation

h: Heat-sealed portion H: Heat-sealed portion

M: Beauty wearing part Q: Bending part

R: Overlap S: Corner

T: Sharpening K: Incision

Technical Field

According to the present invention, when the peripheral edge is folded in consideration of the usage form of the vacuum insulation material used by folding the laminated portions (circumferential edges) of the gas barrier films formed on the peripheral edge, even when a small hole or crack occurs in the film, The present invention relates to a vacuum insulating material and a method for manufacturing the same, which can be mounted in a complex shape where a gas is invaded and the internal vacuum degree is deteriorated and the thermal insulation performance is not deteriorated.

Background

The vacuum insulating material is a sealing material made of a composite plastic laminate film having excellent gas barrier properties as a core material, and a continuous bubble rigid plastic foam, an inorganic material, etc. is stored therein, and the pressure is reduced therein. It is manufactured by heat sealing. In general, since the vacuum insulator passes through the outer encapsulation material, air or moisture permeates, or carbon dioxide or organic gas is generated therein, the vacuum degree gradually decreases with time, and accordingly, the thermal conductivity becomes high, resulting in high thermal insulation. There is a problem that can not be maintained.

In addition, since the vacuum insulation material has laminated portions of gas barrier films at the peripheral edge thereof, it is necessary to bend the peripheral edge portion in order to mount it tightly during use. For example, in Patent Literature 1, when the vacuum insulator is mounted inside the side wall of the box, the laminated portion at the circumferential edge is hindered and a gap is formed at the end, so that the gap is formed at the end so that the laminated portion can be easily bent. It is trying to solve these problems by avoiding it.

However, the gas barrier films are in close contact with each other in the laminated portion of the circumferential edge of the vacuum insulator, but as shown in FIG. 1, other than the heat-sealed portion h of the circumferential edge portion 1a of the vacuum insulator 1. The side closer to the core 2 is a non-thermally welded portion M which is not thermally welded. When this circumferential edge part 1a is folded as shown in FIG. 2, the unbonded part M is often located on the line (henceforth the bending line 4) of a bending part. Therefore, when a small hole and a crack generate | occur | produce in the film on the bending line 4 at the time of folding, there exists a problem that gas invades gradually from it, the vacuum degree inside falls, and heat insulation performance deteriorates easily. In addition, when the other peripheral edge portion 1a is folded in the state shown in FIG. 2 as shown by the arrow in FIG. 3, twice of the peripheral edge portions 1a and 1a 'at the corners of the vacuum insulation material 1. Since a sharp end (hereinafter referred to as a sharp part) is formed at the portion to be folded in, the other part collides with the sharp part T, which causes cracks and the like, and thus, the thermal insulation performance is likely to deteriorate as described above.

In order to solve the above problem, using a rectangular plate-shaped core material to investigate the non-bonding portion of the vacuum insulation material produced by a conventional method, the non-bonding portion (M) along the four sides of the core material (2) Not only was it located close to the core 2, it was found that it was in harmony with the complicated shape of the laminated portions of the gas barrier films 3a and 3b around the corners of the core 2. In detail, as shown in FIG. 4, at the time of manufacture of the vacuum heat insulating material 1, the gas barrier films 3a and 3b which generate | occur | produce around the corner part of the core material 2 by the internal pressure reduction of the sealing body F. FIG. It was found that the bent portion Q, the overlapped portion R, and the corner portion S as shown in FIG. This is because when two gas barrier films 3a and 3b slightly larger than the core 2 are superposed on each other with the core 2 interposed therebetween, and the gas barrier films 3a and 3b at the peripheral edges are stacked, It is presumed that an excess portion appears in the films 3a and 3b around the corner portion of the core 2, and when the pressure is reduced, the excess portion appears as a stacked cross-sectional shape as described above. On the other hand, such a complicated cross-sectional laminated form is also related to the thickness of the core 2 to be accommodated, especially when the core 2 is thick, a slightly larger bend Q and a superimposed portion R around the corners thereof. ), It is easy to produce the corner portion S, and as a result, when the core material 2 is thick, it is guessed that there are many unbonded parts M around a corner part.

In the conventional vacuum heat insulating material 1, the heat-welding layer on the front and rear surfaces of the core material 2 and the inner surface of the gas barrier films 3a and 3b are in close contact with each other by depressurization but are not welded. When gas intruded by the cause, gas also entered between the front and back surfaces of the core material 2, and gas barrier films 3a and 3b.

In addition, as another problem, conventional vacuum insulators are generally rectangular in planar shape. Thus, for example, when the vacuum insulator is mounted on a wall through which a pipe or steel frame, etc., for passing a power line or a communication line passes through, it is possible to avoid the pipe and the like. Although a plurality of vacuum insulators are provided in a manner such as mounting a plurality of vacuum insulators, there is a problem that the thermal conductivity from the periphery of a pipe or the like becomes large and the cost for manufacturing a large number of small vacuum insulators is too high.

In order to solve the above problems, Patent Document 2 has a gas barrier outer shell material having a heat welding layer and a plate-shaped core material, and the core material is made by pressure-sealing sealing between the outer skin materials that the heat welding layers face each other. Including a portion of the core material between the shell material and heating and pressing, the invention of the vacuum insulation material heat-welded so that the opposing heat-welding layer to follow the core shape has been proposed.

In addition, Patent Document 3 is a vacuum insulating material having a limited use in the shape of an object to be applied and having a wide range of uses, and has a gas barrier outer shell material having a heat welding layer and a plate-shaped core material, and the outer skin material in which the heat welding layers face each other. The core material is vacuum-sealed between the core member and the core member is formed under pressure-sealed sealing, and has a circumferential edge portion formed only of the envelope material in close contact with the core member without interposing the core member. The invention of the vacuum insulation material which melt | dissolved the welding layer, and is bonded with the surface part of the said core material, and the heat welding layers which oppose the circumferential edge part of each other along the core shape has been proposed.

In addition, Patent Document 4 discloses a vacuum insulation panel having a notch portion in which a through hole and / or a door hinge fixing member, etc., through which wiring, piping, equipment, and the like can pass, are sealed, and the heat insulating core material is made of a gas barrier packaging material. In a vacuum insulation panel enclosed in a vacuum exhausted state, the vacuum insulation panel has a through hole and / or a notch, and the gas barrier packaging materials are fused together along the inner circumference of the through hole and / or the notch. As a vacuum insulation panel in which a sealing part is formed, the invention of the vacuum insulation panel in which an incision or a slit is formed inside the sealing part was proposed.

The vacuum insulation material of the invention proposed by the said patent documents 2, 3 opposes by absorbing the presence or absence of the core material between outer shell materials by deformation of a hot plate using the heat plate which consists of an elastic body in the heat welding at the time of manufacturing a vacuum insulation material. The thermal welding layers are thermally welded to follow the core shape. However, in such a heating and pressing method, since deformation of the hot plate made of an elastic body has a limit in consideration of the thickness of the core material, the unbonded portion is closer to the core material of the laminated portion of the gas barrier film (exterior material) along the four sides of the core material. There was a problem that this tends to remain. In addition, since there is a need to separately prepare a hot plate made of an elastic body suitable for the size of the vacuum insulation material, there was also a problem that the manufacturing cost is too high. Furthermore, in the vacuum insulation material proposed by patent documents 2 and 3, the bending part, superposition part, and corner part of the said film which generate | occur | produce by the excess gas barrier film around the corner part of a core material are not considered at all, and these parts It is hard to see that the welding of the beauty part in the skin is sufficiently done. In particular, in the hot plate composed of an elastic body, there was a problem that sufficient heating pressure was hardly made around the corners of the core material.

In addition, a sealing portion in which gas barrier packaging materials are fused together is formed along the inner circumferential portion of the through hole and the notch portion in the vacuum insulation panel of the invention proposed in Patent Document 4, but a hot plate is used for fusion of the gas barrier packaging materials. It is assumed to have been. Therefore, even if it seals along the inner periphery of a through hole and a notch part, it is hard to say that the one close | similar to these through holes and a notch part is heat-welded enough. Moreover, also in the invention proposed by this patent document 4, the bending part, superposition part, and corner part of the said film which generate | occur | produce by the excess gas barrier film around the corner part of a core material are not considered at all, and heat in these site | parts is not considered. It is hard to say that welding of the weld part is sufficient.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-295984

[Patent Document 2] Patent Publication No. 3530535

[Patent Document 3] Japanese Patent Publication No. 2004-197954

[Patent Document 4] Japanese Patent Application Laid-Open No. 8-303686

In the present invention, when the circumferential edge portion of the vacuum insulator is folded and used toward the core side, the conventional vacuum insulator has the same problem as described above. In addition, by welding the unbonded portion including the bent portion, the overlapping portion, and the corner portion of the gas barrier film generated around the corner portion of the core material, even if a small hole is opened in the film when folded, and a crack is generated at the edge portion of the corner portion, It is an object of the present invention to provide a new vacuum insulator and a method of manufacturing the same, which can prevent the ingress of gas and prevent a decrease in the degree of vacuum inside.

Means to solve the problem

The structure of the vacuum insulation material of this invention made | formed in order to solve the said subject consists of the vacuum insulation material which accommodated the core material in the sealing body which consists of a gas barrier film which has a heat welding layer, and sealed the inside in the pressure reduction state, The entire or uncoated portion is heated under normal pressure to heat weld the uncoated portion of the encapsulation body.

Moreover, the structure of the manufacturing method of the vacuum heat insulating material of this invention made with the objective of solving the said subject is the thing which accommodated the core material in the sealing body which consists of a gas barrier film which has a heat welding layer, and sealed the inside in pressure reduction state. The vacuum insulator is heated in its entirety or in the uncoated portion under normal pressure to heat weld the uncoated portion of the encapsulation body.

In the above configuration, in the above-described configuration, the uncoated portion to be heated is a non-coated portion containing any one of a bent portion, an overlapping portion, and a corner portion of the gas barrier film formed around the corner portion of the core material by internal pressure reduction of the encapsulation body. The unbonded portion to be heated includes a bent portion or a sharpened portion formed around the core member when the excess gas barrier film around the vacuum insulation member is folded into the core member side. Moreover, it is preferable that the heating temperature of the whole or the part under above-mentioned normal pressure is a temperature about 5 to 35 degreeC higher than melting | fusing point of a heat welding layer.

The above heat-sealing layer is high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), unstretched polypropylene (CPP), stretch polypropylene (OPP), polyvinylidene chloride (PVDC), poly Plastic films of any of vinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), and ethylene-vinyl alcohol copolymer (EVOH) can be used. It is preferable that the thickness of this heat welding layer is 5-50 micrometers.

Next, according to the present invention, those having a through hole and / or a notch in the core can be used. As the core material, a continuous bubble rigid plastic foam or an inorganic substance or a laminate of continuous bubble rigid plastic foam and an inorganic substance can be used.

Moreover, it can also be set as the structure which provided the incision line or the hole or notch along the inner peripheral edge of the said through-hole or the notch in the welding part of the gas barrier films of the part enclosed by the through-hole or the notch. The cut line may be formed to extend from the center of the through hole to the outer circumferential end of the peripheral edge portion.

As an inorganic substance which comprises the said core material, it is preferable to use the glass fiber mat which laminated | stacked and heat-compression-molded by apply | coating 0.5-1.5 wt% of organic binders to glass fiber. On the other hand, it can be set as the structure formed by embedding a gas adsorption agent in the core material.

In addition, as the inorganic material constituting the core material, a glass fiber mat compression-molded by a needle punch can be used without applying a binder such as an organic binder to a laminate of glass fibers. It is also possible to use a glass fiber mat which is collected and hot-pressed.

To practice the invention Best  shape

Next, examples of embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of a vacuum insulator prepared by a conventional method for use in the present invention, FIG. 2 is a partially enlarged side view showing a state in which the peripheral edge portion of the vacuum insulator shown in FIG. 1 is folded into the core side, and FIG. 3 is shown in FIG. A partially enlarged perspective view showing a state before folding the other peripheral edge portion of one vacuum insulator to the core side, FIG. 4 is a perspective view of the periphery of the core corner portion of the vacuum insulator shown in FIG. Fig. 6 is a perspective view showing an example of a method of manufacturing the vacuum insulator of the present invention by full heating, and Fig. 7 shows an example of a manufacturing process of the vacuum insulator of the present invention. 8 is a plan view showing another example of the manufacturing process of the vacuum insulation material of the present invention, Figure 9 is an example of a vacuum insulation material using a core material having a circular through hole in the center 10 is a plan view of another example of a vacuum insulation material using a core material having a circular through hole in the center, FIG. 11 is a plan view of an example of a vacuum insulation material using a core material having a notch in the side portion, and FIG. 12 is a through hole in the form of a key hole. 13 is a plan view of an example of a vacuum insulating material using a core having a core, FIG. 13 is a plan view of an example of a vacuum insulating material using a core having a rectangular through hole at the center, and FIG. 14 is a view of another example of a vacuum insulating material using a core having a rectangular through hole at the center. Fig. 15 is a plan view of an example of a vacuum insulator using a core material having a substantially L-shaped plane, and Fig. 16 is a plan view showing an example of a manufacturing process of a vacuum insulator using a core member having a complicated shape, and Fig. 16 (a) is a circumference. 16, (b) is a vacuum insulator, in which the entirety of the vacuum insulator is heated under normal pressure, and FIG. 16 (c) is a heat-welded gas barrier property. It shows a vacuum insulating material cut to flow along the core member.

1 to 4 show a vacuum insulator 1 as an example to be used in the present invention as described above. This vacuum insulation material 1 was manufactured by the conventional method, and the core material 2 is accommodated in the exterior sealing body F which consists of the gas barrier film 3 which has a heat welding layer, and the inside is made into the pressure reduction state. The opening is sealed. As a manufacturing method, the core material 2 is sandwiched between two gas barrier films 3a and 3b which are slightly larger than this, and the laminated portion of the gas barrier films 3a and 3b at the circumferential edge is heated while being in a reduced pressure. It may be produced by sealing. On the other hand, 1a is a peripheral edge part of the vacuum heat insulating material 1, and is a part which laminated | stacked the gas barrier films 3a and 3b which did not insert the core material 2 of the exterior sealing body F. As shown to FIG. The width of the circumferential edge portion 1a is also related to the thickness of the core 2, but is generally about 10 to 50 mm, preferably about 10 to 30 mm.

As described above with reference to FIG. 1, the vacuum insulator 1 manufactured by the above-described conventional method has a gas barrier film between the heat-sealed portion h of the circumferential edge portion 1a and the core 2 under reduced pressure. (3a, 3b) are in close contact but not thermally welded. Therefore, a problem arises when the circumferential edge portion 1a is folded into the core material 2 side as it is described with reference to FIGS. 2 and 3. In addition, as shown in FIG. 4, the bending part Q of the laminated part of the gas barrier film 3a, 3b which arises around the corner part of the core material 2 at the time of manufacture of the vacuum heat insulating material 1, and overlaps, is superimposed. There is a beauty | wear attachment part M in the part R and the corner part S as shown in FIG.

The present invention is to heat the entire or unbonded portion of the vacuum insulating material (1) manufactured by the above-described conventional method as a base under normal pressure to the outer periphery of the outer package (F), that is, the circumferential edge of the vacuum insulating material (1) It is manufactured by thermal welding the beauty adhesion part in (1a). The whole heating is performed by putting the vacuum heat insulating material 1 in the drier 5 as shown in FIG. As shown in FIG. 7 by the whole heating, the bending part Q and the superimposition part R around the corner part of the core material 2 as well as the side close to the core material 2 along four sides of the core material 2 are shown. , All the welding part (M) in the corner (S) can be welded (H). Moreover, the whole surface of the core material 2 and the heat welding layer of the gas barrier film 3a, the back surface, and the heat welding layer of the gas barrier film 3b can be welded by whole heating, respectively.

Next, partial heating under normal pressure of the beauty | wear adhesion part M is mainly shown in FIG. 8 about the bending part Q, the superimposition part R, and the corner part S around the corner part of the core material 2. As shown in FIG. As described above, the hot air is blown by the hot air blower 6 to weld the unbonded portion M therein. On the other hand, of course, the beauty adhesion part M in the side close to the core 2 along four sides of the core 2 can also be welded. This partial heating can minimize the generation of the gas emitted from the core 2 by heating, compared with the entire heating, so that the inside of the vacuum insulator 1 can be kept at a high vacuum.

The detailed configuration of the gas barrier film 3, the member of the heat-sealing layer, and the like will be described later. For example, the plastic film of the heat-sealing layer may be a high density polyethylene (HDPE), a linear low density polyethylene (LLDPE), an unstretched polypropylene ( CPP), the density of HDPE is 0.93-0.95, the melting point is 120-130 ° C, the density of LLDPE is 0.91-0.93, the melting point is 100-110 ° C, the density of CPP is around 0.90, and the melting point is 130-170 ° C. It heats at the temperature about 5-35 degreeC higher than melting | fusing point of these heat welding layers of HDPE, LLDPE, and CPP. In addition, the adhesion (welding) strength in the case where the plastic film of the heat welding layer is HDPE was measured by changing the heating temperature, as shown in Table 1 below. In addition, it measured about 50 micrometers in thickness of a heat welding layer on the conditions of 300 mm / min of cross heat speed, using Autograph AGS-H * 1KN (Saymads Seisakusho) as a measuring instrument.

In the vacuum insulator 1, a plate having a rectangular plane is used as the core 2, but as described later, a core having a through hole or a notch may be used. Moreover, the outer shape of the core material 2 is not limited to a rectangle, either, A core material whose plane shape is square, trapezoidal, hexagonal, circular, oval, etc. can be used.

Next, the structure of the gas barrier film 3 forming the exterior encapsulation body F will be described. The gas barrier film 3 is formed of a composite plastic laminate film, and the heat-sealing layer, the metal foil, It has a structure which laminated | stacked another plastic film. As the metal foil, aluminum foil, steel foil, stainless foil, copper foil or the like can be used. In addition, a film laminated with a plastic film using a deposition film of a metal or an inorganic material may be used instead of the metal foil.

As an example of the composite plastic laminate film, there may be mentioned a laminate film having a four-layer structure of polyethylene terephthalate film / nylon film / aluminum foil / polyethylene film. In addition, three-layer structure of polyethylene terephthalate film / aluminum foil / high density polyethylene film There is also a laminate film, and when these films are formed in the sealed body (F), the polyethylene film is configured to be inside the sealed body (F). It is of course also possible to replace the aluminum foil of the laminate film with an aluminum deposited film. On the other hand, as the polyethylene (PE) film of the heat-sealing layer, any of low-density polyethylene (LDPE) films can be selected and used in addition to the above-described HDPE and LLDPE, and in addition to PE, stretched polypropylene (OPP) The plastic film of any of polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), and ethylene-vinyl alcohol copolymer (EVOH) may be used. It is preferable that the thickness of a heat welding layer is 5-50 micrometers in this invention.

Next, when the structure of the core material 2 is demonstrated, as a core material 2, a continuous bubble hard plastic foam or an inorganic substance, or a laminated body of a continuous bubble hard plastic foam and an inorganic substance, etc. can be used. As an inorganic substance, the glass fiber mat formed by laminating | stacking and heat-compressing by apply | coating 0.5-1.5 wt% of organic binders to glass fiber can be used. On the other hand, as a continuous bubble rigid plastic foam, what is used by the conventional vacuum heat insulating material can be used. Although not shown in the drawing, the core 2 may be embedded with a gas adsorbent so as to absorb gas that penetrates from an outgas generated from the core 2 or a heat sealing portion over time.

In addition, as an inorganic substance which comprises the core material 2 of the vacuum heat insulating material 1, the glass fiber mat compression-molded by the needle punch can be used, without apply | coating a binder, such as an organic binder, to a laminated body of glass fiber. In addition, glass fibers may be collected using water, and a glass fiber mat formed by heat compression molding may be used.

Next, the core material may be one having through holes or notches, or one having both through holes and notches. These pipes may be passed through the pipe used for wiring or the like to form a vacuum insulation material that can be mounted on such a wall. In addition, the notch is intended to cope with a case where a part of a structural member such as a crutch enters to dig into the wall surface.

FIG. 9 shows an example in which a circular hole 7b is formed in the center of the vacuum insulator 7, and 8 is a core material having a corresponding through hole. In addition, 7a is the heat-welded peripheral edge part of the vacuum heat insulating material 7, and 7c is the laminated part by which the gas barrier films 3a and 3b which enclose the circular hole 7b were welded.

FIG. 10: is an example of the structure by which the gas barrier film | membrane 3a, 3b was welded and the laminated part 9c which formed in the center of the vacuum heat insulating material 9 is formed. The core 10 of the vacuum insulator 9 has a through hole in the center as shown in FIG. A cut line K is formed in a cross shape at the center of the recessed laminated portion 9c. This cut line K adjusts the cut width corresponding to the outer diameter of the pipe passing through the wall surface to be mounted. On the other hand, 9a is a heat-welded circumferential edge portion of the vacuum insulator 9.

FIG. 11 is an example in which an arc-shaped notch 1lb is formed on the side of the vacuum insulator 11, and 12 is a core having a notch having a corresponding shape. 11c is a portion in which gas barrier films 3a and 3b at the circumferential edge of the notch 1lb are welded.

FIG. 12 is an example of the configuration in which the gas barrier films 3a and 3b are welded to each other in the center of the vacuum insulator 13 to form a laminated portion 13c recessed in the form of a keyhole. The core member 14 of 3 has a through hole in the form of a keyhole. In the recessed laminated portion 13c, a cross-shaped incision line K is formed at the center of the through hole, and an incision line K extending from the incision line K over the outer peripheral end of the circumferential edge portion 13a is formed. have. The vacuum insulator 13 cuts the incision line K from the outer periphery to the center of the through hole with respect to the wall surface on which the pipe or the like is already piped, and inserts a pipe or the like into the cut-out to insert the pipe or the like on the wall surface. I can attach it.

FIG. 13: is an example of the structure by which the gas barrier films 3a and 3b were welded to the center part of the vacuum heat insulating material 15, and the laminated part 15c recessed in the rectangle is formed. The core 16 of the vacuum insulator 15 has a rectangular through hole. The cutout line K is formed in the said recessed laminated part 15c, and the cutout position and size of the cutout line K can be adjusted according to the number and outer diameter of the pipe which have passed through the wall surface to be mounted. On the other hand, 15a is a heat-welded circumferential edge portion of the vacuum insulator 15.

FIG. 14 is an example of the configuration in which three through holes 17b are welded to gas center films 3a and 3b at the center of the vacuum insulator 17, and are formed in a rectangular recessed laminated portion 17c. . The core material 18 of the vacuum insulator 17 has a rectangular through hole as in FIG. On the other hand, 17a is a heat-welded circumferential edge portion of the vacuum insulator 17.

Fig. 15 is an example of the vacuum insulator 19 having a substantially L-shaped plane and a groove-shaped notch 19b formed in the inner corner portion. The core 20 of the vacuum insulator 19 has a substantially L-shaped plane and has a notch 20a of approximately circular to circular arcs in the inner corner portion. This vacuum insulation material 19 puts the core material 20 into the sealing body which consists of the gas barrier films 3a and 3b heat-welded on three sides, and vacuums the inside and seals the vacuum insulation material formed by sealing it at normal pressure again. It heats under and heat-bonds the unbonded part of gas barrier film 3a, 3b of upper and lower sides, and is manufactured. The groove-shaped notch 19b is formed by cutting a part of the laminated portions of the gas barrier films 3a and 3b surrounded by the notches 20a of the core material 20 that are thermally welded by the entire heating. This is because in the case of a vacuum insulator having a substantially L-shaped plane, if there is no groove-shaped notch 19b in the inner corner portion, the inner corner portion cannot be folded when the peripheral edge portion is folded. On the other hand, 19a is a thermally welded peripheral edge of the vacuum insulator 19.

Next, an example of the manufacturing process of the vacuum insulation material 21 using the core material of a complicated shape is demonstrated by FIG. Fig. 16 (a) shows a vacuum insulation material 21 formed by sealing a round core material 22 into a sealing body F composed of gas-barrier films 3a and 3b heat-welded on three sides and sealing it while vacuuming the inside thereof. It is shown. In general, since the heat-sealed portion h is a straight line, it is difficult to form it according to the shape of the core material 22, and the gas barrier film 3 remaining on the circumferential edge portion, such as the case where the core material is a simple rectangle, is formed on the upper portion of the core material. Can't pog on FIG. 16 (b) shows a state in which the entire vacuum insulator 21 of FIG. 16 (a) is further heated under normal pressure to heat-weld (H) the unbonded portions of the upper and lower gas barrier films 3a and 3b. have. FIG. 16 (c) shows the vacuum insulator 21 of FIG. 16 (b) leaving the portion where the upper and lower gas barrier films are thermally welded (H) at the peripheral portion of the core member 22 at a constant width, and the other portions thereof. The vacuum insulator 23 cut and manufactured is shown.

9 to 16, the through hole or notch of the core may be polygonal such as triangle, square, hexagon, octagon or the like, or star or heteromorphic circular or heterogeneous polygon, or the like. Cores with both notches may be used.

<Example>

Next, a core material composed of a glass fiber mat coated with 1.2 wt% of an organic binder in a size of 12 × 300 × 400 mm and laminated and hot-pressed was prepared, one having a through hole and one having no through hole, and each having an aluminum foil composite plastic laminate film. After storing the 370 × 500 mm sized encapsulation body without using a gas adsorbent, the vacuum insulating material manufactured by heat sealing the opening by vacuuming the inside was placed in the dryer shown in FIG. 6, and the whole thereof was 130 It was left to stand for 5 minutes in an atmosphere of ℃, heat-welded around the periphery edge portion, the cosmetic bonding portion around the through hole and the front and rear surfaces of the film and the core material to prepare a vacuum insulation material of the present invention, respectively. In addition, the diameter of the through hole was 10 mm.

[Performance test]

The performance test for measuring the thermal conductivity over a maximum of 152 days from the time of manufacture immediately after manufacture under conditions of an acceleration temperature of 70 ° C. × drying and 70 ° C. × 95% RH, with or without the above-described core material, was not performed. The comparison was carried out. The thermal conductivity measuring device HC-074 占 300 (made by Ecosei Seiki) was used for the measurement of thermal conductivity. The results are shown in Table 2 below.

[evaluation]

As can be seen from Table 2, the thermal conductivity of the vacuum insulator according to the present invention, which is thermally welded to the unbonded portion by total heating, is not the same as having a through hole as compared with not performing the thermal welding of the unbonded portion. The lowering of the thermal conductivity was small. This tendency was the same for both the conditions of 70 ° C. × dry and 70 ° C. × 95% RH. On the other hand, the decrease in thermal conductivity was small compared with the one having no through hole.

The present invention is a problem that occurs when the circumferential edge portion of the vacuum insulator folds toward the core material side, that is, in the conventional vacuum insulation material, the cosmetically bonded portions of the gas barrier films are located along the four sides of the core material or around the corners. Since these unbonded parts were folded together in a state of use, a small hole was opened in the film, cracks occurred at the corners of the corners, gas was invaded, and the vacuum degree inside was easily reduced. This problem does not occur when the circumferential edge is folded by welding, and thus it can be said to be an excellent vacuum insulation material that can withstand long-term use. In addition, the present invention can be applied as it is to a vacuum insulating material produced by a conventional method as it is, it is possible to manufacture a vacuum insulating material excellent in heat insulating performance without expensive.

The present invention is a core material by internal pressure reduction of the encapsulation body, in addition to the non-wearing portion in the portion along the four sides of the core material by further heating the whole or the unbonded portion of the vacuum insulation material manufactured by a conventional method under normal pressure without using a hot plate or the like. Since it is possible to sufficiently weld unbonded portions such as bent portions, overlapping portions, and corner portions of the film by the excess gas barrier film formed around the corner portions of the edges, the circumferential edge portion of the vacuum insulation material is folded toward the core side. In use, even if a small hole or a crack is formed in the sharp part T which arises on a bend line or a corner part, gas does not penetrate from the outside and an internal vacuum degree does not fall. In addition, when only the unbonded part is partially heated under normal pressure, generation of gas from the core material can be suppressed, which is more effective.

In addition, since the vacuum insulator according to the present invention can use a through hole, a notch, or both in the core material, the vacuum insulator can be easily attached to a wall surface through which a pipe or the like is perforated, or to a mounting portion having a complicated shape. Can be improved. Furthermore, an incision line or a hole can be formed in the welded part of the gas barrier films enclosed by the through-hole or notch, especially when the incision line is formed from the center of the through-hole to the outer peripheral end of the peripheral edge of the vacuum insulator. Even after attaching the pipe or the like, the effect of mounting the vacuum insulator can be obtained.

Claims (18)

The vacuum insulation material which enclosed a core material in the sealing body which consists of a gas barrier film which has a heat welding layer, and sealed the inside in the pressure reduction state, the whole or the unbonded part is heated under normal pressure, and the beauty welding part of the said sealing body is heat-welded. Vacuum insulation material characterized in that. The vacuum insulator according to claim 1, wherein the core has a through hole or a notch, or a through hole and a notch. The vacuum insulator according to claim 2, wherein an incision line or a hole or a notch along the inner circumferential edge of the through hole or the notch is formed in the welded portion of the gas barrier films in the portion surrounded by the through hole or the notch. . The vacuum insulator according to claim 3, wherein the incision line is formed over the outer peripheral end of the peripheral edge portion at the center of the through hole. The method of claim 1, wherein the non-bonded portion to be heated is a non-bonded portion of any of the bent portion, overlapping portion, corner portion of the gas barrier film generated around the corner portion of the core material by the internal pressure reduction of the encapsulation body. Vacuum insulating material characterized in that. The vacuum insulator according to claim 5, wherein the core has a through hole or notch, or a through hole and notch. 7. The vacuum insulator according to claim 6, wherein an incision line or a hole or notch along the inner circumferential edge of the through hole or notch is formed in the welded portion of the gas barrier films in the portion surrounded by the through hole or notch. . 8. The vacuum insulator according to claim 7, wherein the incision line is formed over the outer circumferential end of the peripheral edge portion at the center of the through hole. 9. The bent portion or the sharp portion of the bent portion according to any one of claims 5 to 8, wherein the unbonded portion to be heated is formed around the core member when the excess gas barrier film around the vacuum insulation member is folded into the core member side. Vacuum insulating material comprising a. The vacuum insulation material which enclosed a core material in the sealing body which consists of a gas barrier film which has a heat welding layer, and sealed the inside in the pressure reduction state, the whole or the unbonded part is heated under normal pressure, and the beauty welding part of the said sealing body is heat-welded. Method for producing a vacuum insulator, characterized in that. The manufacturing method according to claim 10, wherein the core material has a through hole or a notch, or a through hole and a notch. 12. The manufacturing method according to claim 11, wherein an incision line or a hole or notch along the inner circumferential edge of the through hole or notch is formed in the welded portion of the gas barrier films in the portion surrounded by the through hole or notch. . The manufacturing method according to claim 12, wherein the incision line is formed over the outer circumferential end of the peripheral edge portion at the center of the through hole. 15. The method of claim 13, wherein the non-bonded portion to be heated is a non-bonded portion including any of the bent portion, the overlapping portion, and the corner portion of the gas barrier film generated around the corner portion of the core material by internal pressure reduction of the encapsulation body. A manufacturing method characterized by the above-mentioned. 15. The manufacturing method according to claim 14, wherein the core material has a through hole or a notch, or a through hole and a notch. 16. The manufacturing method according to claim 15, wherein an incision line or a hole or notch along the inner circumferential edge of the through hole or the notch is formed in the welded portion of the gas barrier films in the portion surrounded by the through hole or the notch. . The manufacturing method according to claim 16, wherein the incision line is formed over the outer peripheral end of the peripheral edge portion at the center of the through hole. 18. The bent portion according to any one of claims 14 to 17, wherein a bent portion or a sharp portion of the bent portion that occurs around the core member when the excess gas barrier film around the vacuum insulation member is folded into the core member side is heated. A manufacturing method comprising the.

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