KR20050031362A - Vacuum insulation panel, method manufacturing thereof and refrigerator - Google Patents

Abstract

A vacuum thermal insulation panel and a manufacturing method thereof, and a refrigerator are provided to secure excellent surface characteristics by reducing waves and depression of the surface, to shorten the time for production, and to improve efficiency. A manufacturing method of a vacuum thermal insulation panel includes a process of making a binder permeate in an inorganic fiber material and a drying process of reducing moisture impregnated together with a binder in the inorganic fiber material. In the drying process, moisture impregnated together with the binder in the inorganic fiber material is reduced by thermally pressing the inorganic fiber material. The manufacturing method of the vacuum thermal insulation panel comprises a first process of layering the inorganic fiber material and impregnating the inorganic fiber material with the binder(b); a second process of drying the inorganic fiber material to constitute a core member(c,d); and a third process of sealing up the core member formed by the second process, with an outer cover material(d,f). In the second process, the inorganic fiber material, loaded between hot plate, the temperature of which is over 200 degrees centigrade, is pressed for predetermined time.

Description

Vacuum Insulation Panel, Manufacturing Method and Refrigerator {VACUUM INSULATION PANEL, METHOD MANUFACTURING THEREOF AND REFRIGERATOR}

The present invention relates to a vacuum insulated panel usable as a heat insulating material such as a refrigerator, a manufacturing method thereof, and a refrigerator.

As a prior art using the urethane foam of a continuous bubble for a core member, there exist some described in patent document 1. As shown in FIG. In this example, the completed vacuum insulator is pressed to planarity improvement.

In addition, Patent Document 2 and Patent Document 3 disclose vacuum insulators using inorganic fibers as core members. In the example of patent document 2, the vacuum heat insulating material in which inorganic fibers are bound by the component eluted from inorganic fiber is disclosed. Patent Document 3 discloses a configuration in which a reinforcing material is laminated on at least one surface of a core member made of an inorganic fiber assembly.

[Patent Document 1]

Japanese Patent Laid-Open No. 2000-283385

[Patent Document 2]

Japanese Patent Laid-Open No. 7-167376

[Patent Document 3]

Japanese Patent Laid-Open No. 2002-310384

Conventionally, when manufacturing a vacuum heat insulation panel using the urethane foam of a continuous bubble as a core member, as shown in patent document 1, the planarity improvement was aimed at by pressing the completed vacuum heat insulating material. However, in order to improve the performance of the vacuum insulation panel itself, it has been found that it is effective to use inorganic fibers such as glass fibers from the urethane foam containing the organic component as the core member.

However, inorganic fibers such as glass fibers have large deformations such as ripples and dents during vacuum evacuation, and deformations such as ripples and dents can be seen even in finished products as vacuum insulation panels. As an improvement, even if it solidifies to some extent on the panel using a binder, for example, as in patent document 2, the flatness of the surface of urethane foam cannot be maintained, but it is used for manufacturing the vacuum insulation panel using inorganic microfine fiber. Therefore, improvement of surface property was a subject.

In improving the surface properties, it has been attempted to improve the surface properties by laminating a reinforcing material on at least one surface of the core member as described in Patent Document 3. However, increasing the number of materials leads to an increase in work and an increase in product cost, so that even in a vacuum insulation panel made of inorganic microfibers such as glass fibers in the core member, the core member is continuously added without adding new materials. The method of obtaining the surface property equivalent to the vacuum insulation panel which made the bubble rigid urethane foam was calculated | required.

In order to improve surface property, the method of improving the adhesive force using an organic or inorganic binder is adopted in order to increase the binding force of a core member. In the case where the binder is employed in this manner, the degree of vacuum gradually decreases due to the moisture generated from the core member unless some amount of water is removed until vacuum evacuation during the manufacturing process. The decrease in the degree of vacuum greatly deteriorates the heat insulating performance of the vacuum heat insulating panel, which causes a problem in terms of reliability of the vacuum heat insulating material. Therefore, in the case of employing a binder, vacuum evacuation is usually performed after the drying step.

However, as a drying process, even if it drys with a core member in a hot air drying furnace, for example, big improvement of the surface property of a core member cannot be achieved, and raises the following problems.

First, when used in a refrigerator, when adhesion to the outer plate causes a poor adhesion or becomes a cause of inhibition of adiabatic urethane flow. If the flow is inhibited, voids or gaps are formed, which causes a decrease in thermal insulation performance.

Secondly, when a vacuum insulator having unevenness, warpage or wrinkles on the surface is used in a refrigerator, not only adhesion failure occurs when the outer plate of the refrigerator is adhered to the vacuum insulator, but the outer plate shape is uneven in the vacuum insulation panel. It is influenced by warping and wrinkles, which also affects the appearance of the refrigerator.

Third, in the manufacturing process of enclosing the core member with the outer shell material, the outer shell material is damaged due to minute unevenness or wrinkles on the surface of the core member. The envelope requires gas barrier properties to maintain the vacuum of the vacuum insulation panel, thereby forming an aluminum layer. If the aluminum layer is damaged by irregularities on the surface of the core member, the gas barrier property is lowered, causing a decrease in heat insulating performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a vacuum insulation panel and a refrigerator having excellent surface properties by reducing as much as possible the surface ripples and depressions generated when inorganic fibers are used as the core member of the vacuum insulation panel. It aims at shortening production time and realizing efficiency.

In order to achieve the above object, the present invention is a method of manufacturing a vacuum insulation panel produced by impregnating a binder in an inorganic fiber material to increase the bonding force of the core member,

After penetrating a binder into the said inorganic fiber material, it is characterized by having the drying process which reduces the moisture impregnated with the binder with the said inorganic fiber material.

Moreover, in the manufacturing method of said vacuum heat insulation panel,

The drying step is characterized by reducing the moisture impregnated with the binder in the inorganic fiber material by heat-processing the inorganic fiber material.

Moreover, in the manufacturing method of said vacuum heat insulation panel, the hotplate temperature of the said heat process was made 200 degreeC or more, It is characterized by the above-mentioned.

In addition, the method of manufacturing a vacuum insulation panel of the present invention comprises a first step of impregnating a binder by laminating an inorganic fiber material;

A second step of drying the inorganic fiber material in which the binder obtained by this first step is impregnated and laminated to form a core member,

It has a 3rd process which seals the core member obtained by this 2nd process with an outer shell material,

The second step is characterized in that the inorganic fiber material loaded between the hot plates having the hot plate temperature of 200 ° C. or more is pressed for a predetermined time.

In addition, a first step of impregnating a binder by laminating an inorganic fiber material,

The inorganic fiber material laminated by impregnating and obtaining the binder obtained by this first step is pressed in a plane shape larger than this inorganic fiber material between the upper hot plate and the lower hot plate at the same temperature with each temperature being 200 ° C. or higher. Second process,

It has a 3rd process which seals the core member obtained by this 2nd process with an outer shell material,

The pressure width of the upper hot plate and the lower hot plate in the second step is determined from the amount of the binder laminated in the first step and the thickness of the inorganic fiber material impregnated with the binder.

In addition, the vacuum insulation panel of the present invention is characterized in that the inorganic fiber-based material is impregnated with a binder, and then heat-processed the inorganic fiber material to reduce moisture impregnated in the inorganic fiber material.

Further, the inorganic fiber material impregnated with a binder is laminated, and the laminated inorganic fiber material is pressed for a predetermined time by a hot plate having a planar shape larger than the inorganic fiber material, and the pressed inorganic fiber material is provided as a core member. It is done.

Furthermore, in the vacuum insulation panel formed by inserting the core member which consists of an inorganic fiber material in the outer cover material which coat | covered the inner surface of the metal foil with the inner layer film, Unevenness | corrugation of 1 mm or more in height, 3 mm or more in width, on the surface of the said vacuum insulation panel, It is characterized by no wrinkles.

In addition, the refrigerator of the present invention contacts the inner surface of the outer wall of the box member of the refrigerator, wherein the surface of the vacuum insulation panel manufactured by sealing a core member manufactured by pressing an inorganic fiber material laminated by impregnation with a binder between hot plates with an outer covering material. Characterized in that arranged.

In addition, the surface of the vacuum insulation panel manufactured by sealing the core member produced by pressing the inorganic fiber-based material laminated by impregnating the binder between hot plates having a hot plate temperature of 200 ° C. or higher with an outer shell material of the box member of the refrigerator. It is characterized in that it is disposed in contact with the inside of the outer wall.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described.

1 is a cross-sectional view of a vacuum insulated panel according to an embodiment of the present invention, and FIG. 2 is a view showing a manufacturing process of a core member shown in an embodiment of the present invention. Reference numeral 1 denotes an outer shell material having a gas barrier property, and the core member 2 and the absorbent material 3 made of an inorganic ultrafine fiber material are sealed under reduced pressure to provide thermal insulation performance as vacuum insulation. The outer cover material 1 has metal foils, such as aluminum, with good gas barrier property inside, and is integrally comprised by the inner layer film which can be heat-welded, such as a high density polyethylene resin and a polyacrylonitrile resin inside.

Here, the example of manufacture of the core member 2 is demonstrated by FIG.

Reference numeral 4 denotes an inorganic ultrafine fiber material, for example, glass fiber, which is a raw material of the core member 2, and a plurality of core member raw materials 4 are laminated and bonded with an inorganic binder to improve handling in manufacturing. . At this time, since the inorganic binder contains water, it is necessary to remove the water that penetrates at the same time as the binder penetrates into the inorganic ultrafine fiber material. That is, when the core member raw material 4 is bonded with an inorganic binder and covered with the outer cover material 1, moisture is generated from the core member 2 after the pressure reduction sealing, and the vacuum degree gradually decreases, and the heat insulating performance of the vacuum insulation panel is reduced. There is a problem in terms of reliability as a vacuum insulation panel which leads to deterioration significantly. Therefore, a drying process is provided as a process for reducing moisture from the inorganic microfine fiber material in which the binder has penetrated. In this specification, the process of reducing moisture from the inorganic microfine fiber material is generically referred to as a drying process.

As this drying process, as shown in FIG. 2, the process of heat-molding using the process 5 of the inside of a hot-air drying furnace which can be considered as a normal drying process, and the heat process which enables surface shaping as well as the drying which become an Example of this invention are possible. Process 6 can be considered, and the Example of this invention is demonstrated simultaneously, comparing the temperature, external appearance, and optimal process time of said two processes 5 and 6.

In addition, from the viewpoint of appearance evaluation, the smoothness of the surface including the height and width of the unevenness, the amount of warpage and the wrinkles was selected. Regarding the irregularities, the state of the irregularities on the surface is determined by visual observation from a distance of 30 cm based on the brightness of 300 lux or more, and the height and width are measured with a vernier caliper. The amount of warpage after vacuum packaging of the vacuum insulated panel is matched to the vacuum insulated panel placed on the base, and the gap between the base and the gauge is measured on a scale. About the smoothness of the surface, the state of wrinkles is judged by visual observation from a distance of 30 cm based on brightness of 300 lux or more.

Moreover, ten samples in each process were created, and the thing which becomes the maximum value among them was employ | adopted.

(Reference Example 1)

The laminate of glass fibers having an average fiber diameter of 4 µm was solidified using an inorganic binder. The subsequent drying step is step 5 of standing in a hot air drying furnace, and the furnace temperature is 150 ° C. It is made to dry on this condition, a core member is produced, and the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced.

As a result of measuring the surface state of the vacuum insulation panel thus obtained, the unevenness was 1.5 mm in height and 4.2 mm in width, the amount of warpage was 2.5 mm, and the appearance was also not good because there were many wrinkles. In addition, the required drying process time was 90 minutes until the optimum amount of moisture for vacuum packaging.

In addition, the optimal moisture content is a moisture content which becomes 0.2% by ratio with the total weight of a core member in this specification, and when moisture content is below this value, the fall of the thermal insulation performance after vacuum-packing as a vacuum insulation panel is suppressed small. can do.

(Reference Example 2)

The laminate of glass fibers having an average fiber diameter of 4 µm was solidified using an inorganic binder. The subsequent drying step is step 5 of standing in a hot air drying furnace, and the furnace temperature is 200 ° C. It is made to dry on this condition, a core member is produced, and the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced.

As a result of measuring the surface state of the vacuum insulation panel obtained in this way, unevenness was 1.3 mm in height and 3.9 mm in width, the curvature amount was 2.3 mm, and the appearance was also unsatisfactory with many wrinkles. In addition, the process time required until the optimum amount of moisture for vacuum packaging was 60 minutes.

(Reference Example 3)

The laminate of glass fibers having an average fiber diameter of 4 µm was solidified using an inorganic binder. The subsequent drying step is step 5 of standing in a hot air drying furnace, and the furnace temperature is 250 ° C. It is made to dry on this condition, a core member is produced, and the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced.

As a result of measuring the surface state of the vacuum insulation panel thus obtained, the unevenness was 1.3 mm in height and 3.6 mm in width, the warpage amount was 2.2 mm, and the appearance was also not good because there were many wrinkles. Moreover, the required process time was 40 minutes until it became the optimal amount of moisture for vacuum packaging.

(First embodiment)

The laminate of glass fibers having an average fiber diameter of 4 µm was solidified using an inorganic binder. The subsequent drying step is step 6 of hot process heating molding, and the hot process hot plate temperature is 150 ° C. It is made to dry on this condition, a core member is produced, and the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced.

As a result of measuring the surface state of the vacuum heat insulation panel obtained in this way, unevenness was 0.9 mm in height and 1.4 mm in width, the curvature amount was 1.5 mm, and there was no big wrinkle in appearance, and it was flat and favorable to some extent. In addition, the process time required until the optimal amount of moisture for vacuum packaging was 10 minutes.

(2nd Example)

The laminate of glass fibers having an average fiber diameter of 4 µm was solidified using an inorganic binder. The subsequent drying process is step 6 of hot process heating molding, and the hot process hot plate temperature is 200 ° C. It is made to dry on this condition, a core member is produced, and the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced.

As a result of measuring the surface state of the vacuum insulation panel thus obtained, the unevenness was 0.8 mm in height and 1.2 mm in width, the warpage amount was 1.2 mm, and almost no wrinkles were found, which was very good. In addition, the process time required until the optimal amount of moisture for vacuum packaging was 7 minutes.

(Third Embodiment)

The laminate of glass fibers having an average fiber diameter of 4 µm was solidified using an inorganic binder. The subsequent drying step is step 6 of hot process heating molding, and the hot process hot plate temperature is 250 ° C. It is made to dry on this condition, a core member is produced, and the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced.

As a result of measuring the surface state of the vacuum insulation panel thus obtained, the unevenness was 0.7 mm in height and 1.3 mm in width, the warpage amount was 1.1 mm, and almost no wrinkles were found. In addition, the process time required until the optimal amount of moisture for vacuum packaging was 7 minutes.

(Comparative Example)

The core member is a continuous foamed rigid polyurethane foam having good planarity. In this case, a predrying process is performed in a hot air drying furnace for the purpose of removing moisture, gas, etc. contained in a rigid polyurethane foam, and after drying, the said core member is accommodated in a gas barrier film. In this state, 10 minutes in the rotary pump of the vacuum packaging machine, 10 minutes in the diffusion pump, exhausted until the internal pressure of the gas barrier film is 1.3 Pa, and then the end of the gas barrier film is sealed by heat sealing to vacuum insulation The panel was produced. As a result of measuring the surface state of the vacuum insulation panel thus obtained, unevenness was hardly observed, and the amount of warpage was 1.1 mm.

Table 1 puts together the result obtained by the above reference example, an Example, and a comparative example. According to this result, even when inorganic microfine fibers such as glass fibers such as glass walls are used as the vacuum insulation panel, by adopting step 6 of thermal process heating molding, surface irregularities, warpage, and wrinkles can be reduced, resulting in surface properties. This excellent vacuum insulation panel can be obtained. Moreover, average process time can also be reduced significantly.

Moreover, even when the process 6 of thermal process heating shaping | molding is performed, the one with higher pressure temperature is more excellent in surface property, and can shorten average process time further. However, in the case where the pressure temperature was set at 200 ° C. (second example) and at 250 ° C. (third example), there was no significant change in the average process time, and no significant difference was observed in the surface properties. In consideration of the efficiency at the time, etc., in this example, the pressure temperature is preferably 200 ° C.

Reference Example 1 Reference Example 2 Reference Example 3 Example 1 Example 2 Example 3 Comparative example Core member material glass fiber glass fiber glass fiber glass fiber glass fiber glass fiber Communicating Urethane Drying method Hot air drying furnace Hot air drying furnace Hot air drying furnace Thermal process Thermal process Thermal process - Temperature (℃) 150 200 250 150 200 250 - Unevenness Height (mm) 1.5 1.3 1.3 0.9 0.8 0.7 About 0 Width (mm) 4.2 3.9 3.6 1.4 1.2 1.3 About 0 Deflection (mm) 2.5 2.3 2.2 1.5 1.2 1.1 1.1 Appearance (wrinkles) × × × △ ○ ○ ○ Average process time (minutes) 90 60 40 10 7 7 -

As described above, according to the present embodiment, as much as possible, the surface wave or dent caused by the lack of rigidity in the core member of the vacuum insulation panel, for example, an inorganic microfiber such as glass fiber, is used to improve the thermal insulation performance. The use environment as a product of a vacuum insulation panel can be raised. Specifically, the drying process is carried out to disperse the moisture of the binder employed to increase the bonding force of the core member during molding of the vacuum insulation panel. By removing the unevenness as much as possible, not only stabilization of the surface properties of the manufactured vacuum insulation panel can be realized, but also a significant reduction in production time.

Fig. 3 shows a process for producing a vacuum insulation panel in the case of adopting step 6 of thermal process heating molding. First, the raw surface of an inorganic ultrafine fiber, such as glass fiber wound in roll shape, is cut (FIG. 3A). This cut inorganic microfine fiber has a difficulty in handling in a planar shape, and becomes a problem when encapsulated in an outer shell material thereafter. Thus, the inorganic fine fibers are laminated, and the laminate is impregnated with an inorganic binder to solidify it (Fig. 3 (b)). In this example, three inorganic ultrafine fibers are laminated.

Thereafter, there is a step 6 of thermal process heating molding which is a step of the present embodiment. Heat treatment is performed until the moisture of the inorganic fine fibers impregnated with the inorganic binder reaches the optimum amount of moisture for vacuum packaging in a subsequent process (Fig. 3 (c)). When the thermal process is performed at a predetermined temperature for a predetermined time, the core member is completed (Fig. 3 (d)).

At this time, it is preferable that the upper hot plate and the lower hot plate of the thermal process facility are configured to be larger than the cut inorganic microfine fibers, and the upper hot plate and the lower hot plate are at the same temperature. This is because, as shown in the above embodiment, the surface properties are different depending on the temperature of the hot plate. Therefore, when the hot plate temperature is different from the upper side and the lower side of the inorganic microfine fiber, the surface properties of the core member are different from the upper side and the lower side. . In this example, the upper hot plate and the lower hot plate are set to have the same temperature. In addition, it is natural that the top and bottom surfaces need to be flat.

In addition, in the process 6 of heat process heating shaping | molding, as shown in Table 1, compared with the process 5 of the standing in a hot-air drying furnace, there is no big difference in the average process time by a temperature difference. Therefore, even if some temperature nonuniformity arises in the temperature of each part of a hotplate, or even if some difference arises in the temperature of an upper hotplate and a lower hotplate, it does not affect a drying effect significantly. Moreover, when the set temperature is around 200 ° C, the average process time until the optimum amount of water before and after the change does not change substantially, so there is less influence.

In this example, the thickness of three laminated inorganic microfine fibers is about 80 to 100 mm. The laminated inorganic microfine fibers are impregnated with a binder to a thickness of about 50 to 80 mm. Further, the thermal process is performed at a pressure width, that is, the distance between the upper hot plate and the lower hot plate as 12 mm. Since the distance between the upper hot plate and the lower hot plate is about 12 mm, even if some difference occurs in the hot plate temperature at the upper side and the lower side, the drying effect is not greatly affected.

Via these steps, a core member having excellent surface properties can be obtained. The said pressure width is determined so that it may become the required width | variety, such as arrange | positioning to the box member of a refrigerator as mentioned below, the use aspect of a vacuum insulation panel, for example, below. Secondly, it is also determined by the thickness before the press of the laminated inorganic microfine fiber and the impregnation amount of the binder. The thickness of 12 mm in this example is that the vacuum insulated panel is placed on the box member of the refrigerator as described later, so that the thickness of the laminated inorganic microfibers before pressing is 50 to 80 mm, and the inorganic microfibers of this thickness are the maximum. This is because the thickness that can be compressed to is 12 mm.

In addition, when the core member is thermally processed between the upper hot plate and the lower hot plate, when the binder adheres to the hot plate, the core member is less likely to be peeled off from the hot plate, so a release film may be used. That is, the release film is inserted between the core member and the upper hot plate and between the core member and the lower hot plate to facilitate taking out the core member from the hot plate. However, if the core member is covered with the organic material film, it is not necessary to use this release film, and the organic material film covers the core member together with the outer cover material encapsulating the core member in a later step, thereby improving gas barrier properties.

The core member obtained by the thermal process was filled in the envelope formed in a bag shape together with the adsorbent [Fig. 3 (e)], and the envelope was sealed in a vacuum packaging machine [Fig. 3 (f)]. The vacuum insulation panel of the example is completed.

4 is a longitudinal sectional view showing the refrigerator of this embodiment. The box member 10 of the refrigerator is foam-filled between an outer box 20 formed using a sheet steel sheet, an inner box 50 formed of a resin, or the like, and an outer box 20 and an inner box 50. It is comprised by foam heat insulating materials 4, such as urethane. In the box member 10, the refrigerator compartment 100a, the vegetable compartment 100b, and the freezer compartment 110a, 11b are partitioned, and the heat insulation which forms these refrigerator compartment 100a, the vegetable compartment 100b, and the freezer compartment 110a and 110b. In the wall, vacuum insulators 30a to 30e having better heat insulating performance than foamed heat insulators 40 such as urethane are disposed.

These vacuum heat insulating materials 30a-30e were produced via the process 6 of heat process heat forming as mentioned above, and the vacuum heat insulating panel excellent in the surface property is employ | adopted. The heat insulation performance of a refrigerator is made higher by covering the upper side wall, the upper back wall, the upper side wall, the lower back wall, and the lower side wall of the refrigerator with the vacuum heat insulating materials 30a-30e, respectively.

In addition, the cooler 60 and the compressor 70 constituting the refrigerating cycle are arranged near the lower rear wall, and the refrigerant pipe connecting them is provided in the foam insulation 40. In the vicinity of the cooler 60, a blower fan 80 is arranged to transfer the cool air to each storage chamber. The electric wiring 90 of this blowing fan 80 is coat | covered with soft resin, etc., and is installed in the foam heat insulating material 40. As shown in FIG.

In the refrigerator of the present embodiment, the vacuum insulators 30a to 30e are adhered to the inner side of the outer wall of the box member 10. That is, since the outer wall of the vacuum insulation panel and the outer box 10 are in contact with each other, the surface property of the vacuum insulation panel affects the appearance of the refrigerator. In addition, since the foamed heat insulating material 40 such as urethane is filled and foamed in a state in which the vacuum heat insulating materials 30a to 30e are adhered to the inside of the outer wall of the box member 10, the surface properties of the vacuum heat insulating panel are poor, and irregularities and wrinkles are present. In the process of filling and foaming the foamed heat insulating material 40 such as urethane, it becomes a factor that impedes the filling flow of the foamed heat insulating material and affects the heat insulating performance.

In addition, the refrigerant | coolant piping and the electrical wiring 90 which comprise a refrigeration cycle are arrange | positioned in the foam heat insulating material 40. As shown in FIG. In the case where the distance between the refrigerant pipe and the electrical wiring 90 is close, as in the vacuum insulator 30d shown in FIG. 4, the unevenness, warpage, and wrinkles of the vacuum insulation panel are large, and the surface properties are poor. And interference with the refrigerant pipe and the electrical wiring 90 not only impedes the filling flow of the foam insulation, but also affects the insulation performance.

Therefore, by using the vacuum heat insulating panel excellent in surface property as a vacuum heat insulating material as in this example, it is possible to provide a refrigerator having high reliability and good heat insulating performance by avoiding the problems caused by the surface properties as described above. In addition, since both surfaces of the vacuum insulated panel have the same surface properties, the surface and the back surface of the core member in step 6 (Fig. 3 (c)) of thermal process heating molding are attached to the refrigerator. The lower surface) does not need to be distinguished, and the manufacturing efficiency is also improved.

According to the present invention, it is possible to provide a vacuum insulation panel and a refrigerator having excellent surface properties by reducing as much as possible the surface ripples and dents generated when the microfibers having insufficient rigidity are used for the core member of the vacuum insulation panel to improve performance. In addition, the production time can be shortened and the efficiency can be realized.

1 is a schematic cross-sectional view of a vacuum insulated member showing an embodiment of the present invention.

Figure 2 is a manufacturing process diagram of the core member showing an embodiment of the present invention.

3 is a view showing a manufacturing process of the vacuum insulation panel of the embodiment of the present invention.

4 illustrates a refrigerator of an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: shell material

2: core member

3: adsorption material

4: core member raw material

5: process of drying in a hot air drying furnace

6: process of thermal process heating forming

30a to 30e: vacuum insulation

Claims (10)

In the method of manufacturing a vacuum insulation panel produced by impregnating a binder in an inorganic fiber-based material to increase the bonding force of the core member, And a drying step of reducing moisture impregnated with the binder in the inorganic fiber material after the binder is penetrated into the inorganic fiber material. The method of manufacturing a vacuum insulation panel according to claim 1, wherein the drying step reduces moisture impregnated with the binder in the inorganic fiber material by thermally processing the inorganic fiber material. The method for manufacturing a vacuum insulated panel according to claim 2, wherein the hot plate temperature of the heat process is set to 200 ° C or higher. A first step of impregnating a binder by laminating an inorganic fiber material; A second step of drying the inorganic fiber material in which the binder obtained by this first step is impregnated and laminated to form a core member, It has a 3rd process which seals the core member obtained by this 2nd process with an outer shell material, The said 2nd process presses the inorganic fiber material loaded between the hot plates which made hotplate temperature 200 degreeC or more for predetermined time, The manufacturing method of the vacuum insulation panel characterized by the above-mentioned. A first step of impregnating a binder by laminating an inorganic fiber material; The inorganic fiber material laminated by impregnating and obtaining the binder obtained by this first step is pressed in a plane shape larger than this inorganic fiber material between the upper hot plate and the lower hot plate at the same temperature with each temperature being 200 ° C. or higher. Second process, It has a 3rd process which seals the core member obtained by this 2nd process with an outer shell material, The press width of the upper hot plate and the lower hot plate in the second step is determined by the amount of the binder laminated in the first step and the thickness of the inorganic fiber material impregnated with the binder. Way. A vacuum insulation panel manufactured by impregnating an inorganic fiber material with a binder and then heat-processing said inorganic fiber material to reduce moisture impregnated in said inorganic fiber material. A vacuum insulated panel comprising a laminated inorganic fiber material impregnated with a binder and pressing the laminated inorganic fiber material into a hot plate having a planar shape larger than the inorganic fiber material for a predetermined time, and having the pressed inorganic fiber material as a core member. A vacuum insulation panel formed by inserting a core member made of an inorganic fiber material into an outer shell material coated with an inner layer film of a metal foil, wherein irregularities and wrinkles of 1 mm or more in height and 3 mm or more in width are formed on the surface of the vacuum insulation panel. Vacuum insulation panel characterized in that there is no. A refrigerator in which a surface of a vacuum insulation panel manufactured by sealing a core member manufactured by pressing an inorganic fiber material laminated by impregnation with a binder between hot plates with an outer cover material is disposed in contact with an inner side of an outer wall of the refrigerator box member. The surface of the vacuum insulation panel produced by sealing the core member produced by pressing the inorganic fiber material laminated by impregnating the binder between the hot plates having a hot plate temperature of 200 ° C. or higher with an outer shell material is formed inside the outer wall of the refrigerator box member. Refrigerator placed in contact.