Method of bonding a vacuum insulation panel for a refrigerator

Abstract

The application provides a bonding method of a vacuum heat insulation plate of a refrigerator, comprising the following steps: bonding one side of a condenser tube to an aluminum foil plate by using adhesive tape; placing the aluminum foil plate with the condenser tube on the bottom of a foaming mold, and bonding the vacuum heat insulation plate to the other side of the condenser tube; after the vacuum heat insulation plate is spliced, spraying foaming material into the accommodating groove of the vacuum heat insulation plate; wherein the foaming material comprises isocyanate and polyether polyol, and the volume ratio of the isocyanate and the polyether polyol is 1:1; after the foaming material is foamed and expanded, the vacuum heat insulation plate is bonded to the side plate of the refrigerator by using an adhesive. The composition of the foaming material is improved, the bonding performance of the material can be improved, the foaming reaction can be faster, and therefore the problem of foaming layering in the bonding process of the vacuum heat insulation plate of the refrigerator can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a bonding method of a vacuum insulation plate of a refrigerator. BACKGROUND

[0002] The VIP plate, the full name of which is Vacuum insulation panel, is made based on the vacuum insulation principle. By maximizing the vacuum degree in the plate and filling the core layer insulation material, heat conduction is isolated to achieve the purpose of heat preservation and energy saving. Because the vacuum insulation plate has low thermal conductivity, small volume and environmental protection, it is widely used in the refrigerator industry.

[0003] The refrigerator is heat-preserved by adding a vacuum insulation plate in the foaming layer. The installation method of the vacuum insulation plate is to directly bond the vacuum insulation plate on the side plate of the refrigerator where the condenser pipe is installed. However, due to the large gap between the vacuum insulation plate and the condenser, air cannot be excluded after foaming, which causes the problem of foaming layering and affects the service life of the refrigerator. SUMMARY

[0004] The present application provides a bonding method of a vacuum insulation plate of a refrigerator to solve the problem of foaming layering in the bonding process of the vacuum insulation plate in the refrigerator.

[0005] The bonding method of the vacuum insulation plate of the refrigerator provided by the present application comprises the following steps: bonding one side of a condenser pipe on an aluminum foil plate with adhesive tape;

[0006] Placing the aluminum foil plate with the condenser pipe bonded thereon at the bottom of a foaming mold, and bonding a vacuum insulation plate on the other side of the condenser pipe;

[0007] After the vacuum insulation plate is bonded, foaming material is sprayed in the accommodating groove of the vacuum insulation plate; wherein the foaming material comprises isocyanate and polyether polyol, and the volume ratio of the isocyanate and the polyether polyol is 1:1;

[0008] After foaming and expansion, the vacuum insulation plate is bonded on the side plate of the refrigerator by an adhesive.

[0009] In a possible implementation, the isocyanate is one or a combination of polyphenylmethane polyisocyanate and diphenylmethane-4,4-diisocyanate.

[0010] In a possible implementation, the foaming material comprises the polyphenylmethane polyisocyanate and the diphenylmethane-4,4-diisocyanate, and the mass ratio of the polyphenylmethane polyisocyanate and the diphenylmethane-4,4-diisocyanate is 7:3.

[0011] In a possible implementation, the polyether polyol is a polyether mixture.

[0012] In a possible implementation, the thickness of the aluminum foil plate is 0.2-0.4 mm.

[0013] In a possible implementation, before the side of the condenser tube is attached to the aluminum foil plate by the adhesive tape, the aluminum foil plate is cleaned and dried in an oven at 30-50℃.

[0014] In a possible implementation, the adhesive is one or a combination of epoxy resin, phenolic resin, urea-formaldehyde resin, polyamine ester, polyvinyl acetal, perchloroethylene resin, neoprene, and nitrile rubber.

[0015] In a possible implementation, before the vacuum insulation plate is attached to the side plate of the refrigerator by the adhesive, the method further comprises: attaching a layer of release paper with a thickness of 0.12-0.20 mm to the other side of the aluminum foil plate by the adhesive.

[0016] In a possible implementation, the height of the mold is greater than the height of the vacuum insulation plate, and the height difference between the mold and the vacuum insulation plate is 3-15 mm.

[0017] According to the above technical solution, the application provides a method for attaching a vacuum insulation plate of a refrigerator, which comprises: attaching one side of a condenser tube to an aluminum foil plate by an adhesive tape; placing the aluminum foil plate with the attached condenser tube at the bottom of a foaming mold, and attaching a vacuum insulation plate to the other side of the condenser tube; after the vacuum insulation plate is attached, spraying a foaming agent into the accommodating groove of the vacuum insulation plate; wherein the foaming agent comprises isocyanate and polyether polyol, and the volume ratio of the isocyanate and the polyether polyol is 1:1; after foaming and expansion, the vacuum insulation plate is attached to the side plate of the refrigerator by an adhesive. The composition of the foaming agent is improved in the application, which can better increase the adhesion performance and faster foaming reaction, thereby being more suitable for adhesion and effectively relieving the problem of foaming and layering during the adhesion of the vacuum insulation plate of the refrigerator. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the application, the following will briefly introduce the drawings needed in the embodiments. Obviously, other drawings can also be obtained by those skilled in the art without creative effort on the premise of not paying creative effort.

[0019] Figure 1 The flowchart of the method for attaching a vacuum insulation plate of a refrigerator according to the embodiments of the application is provided.

[0020] Figure 2The schematic diagram of the vacuum heat insulation plate of the refrigerator provided by the embodiment of the present application. DETAILED DESCRIPTION

[0021] The embodiments will be described in detail below with reference to the drawings. When the following description refers to the drawings, identical numbers on different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples are not representative of all embodiments consistent with the present application. Rather, they are examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0022] The vacuum heat insulation plate can be made of high air permeability kraft paper bag, adsorbent, aluminum film coated plastic sheet type container, and special powder (e.g. pearlite). The outer layer of the vacuum heat insulation plate can be an aluminum film coated plastic bag, and the inner layer can be a packaging bag with good air permeability, which contains special powder. The powder mainly plays a role of heat insulation in a vacuum state after the air in the bag is extracted. The powder contained in the kraft paper bag must ensure good air permeability, so that the powder does not disperse after the gas contained in the powder is extracted. The adsorbent is used to adsorb the remaining air and other types of gas in the bag, so as to ensure that the bag has good vacuum performance and heat insulation performance. The aluminum film coated plastic sheet container is mainly composed of a new type of composite material including a heat-resistant solution layer, an air barrier layer, and a surface layer, so as to play a role of heat capacity sealing and anti-radiation. In addition, the residual gas pressure in the vacuum heat insulation plate must be in the range of 1.36~136 Pa, so as to ensure that the special powder forms a flat layer under the compression of the internal and external pressure difference, thereby playing an ideal heat insulation and heat preservation effect.

[0023] The thermal conductivity of the vacuum heat insulation plate is in the range of 0.0047~0.007 W / m°K, and its heat insulation performance is 3~4 times that of the polyurethane heat insulation layer. This is because the two have different heat insulation mechanisms. The heat transfer coefficient of the vacuum heat insulation plate is determined by the radiation, gas, contact heat conduction, and powder volume ratio of the powder, so that the distance between the space walls can be effectively shortened by filling the vacuum space with porous heat insulation materials, and the vacuum degree can be reduced, so that the average free path of gas molecules is higher than the powder spacing, thereby reducing the heat conduction of air. At the same time, the gas is separated by the powder flat layer in countless small spaces, so the heat transfer in the vacuum heat insulation plate is low, and when the pore diameter is less than 4 mm, the heat transfer of the gas to the box can be ignored. At the same time, the powder in the space between the walls can effectively enhance the radiation scattering and reflection, thereby reducing the radiation heat flow, so as to improve the heat preservation performance of the box. Therefore, compared with the refrigerator box using the polyurethane heat insulation layer, the vacuum heat insulation plate has more superior heat insulation and heat preservation effect. Due to the low thermal conductivity, small volume and environmental protection of the vacuum heat insulation plate, the vacuum heat insulation plate can be applied in the refrigerator industry.

[0024] The vacuum heat insulation plate installation has many assembly methods. For installation of a small-size vacuum heat insulation plate, a support card can be used to fix the vacuum heat insulation plate on the side plate area of the refrigerator. After the refrigerator is foamed and installed, the vacuum heat insulation plate is located in the middle of the foaming layer. This special assembly method can avoid damage to the vacuum heat insulation plate by external force, thereby ensuring the heat preservation effect of the vacuum heat insulation plate.

[0025] In one possible implementation, the bonding surface of the vacuum heat insulation plate is grooved. A groove with a width of 20 mm, a thickness of 4-7 mm, and a length extending through the entire VIP plate is formed at the position corresponding to the condenser pipe to avoid the condenser pipe. The bonding surface normally has pressure-sensitive adhesive and release paper. After the condenser pipe is clamped in the groove during bonding, the pressure bonding process is performed.

[0026] The above-mentioned installation method of the vacuum heat insulation plate has the risk of misalignment of the bonding, thereby causing traces on the side plate and causing scrap. In addition, the surface film material of the vacuum heat insulation plate is easily damaged. Each fold increases the risk of air permeability. One groove has four folds. The risk of air leakage increases by more than 10 times for each groove, greatly increasing the risk of air leakage.

[0027] Therefore, the above-mentioned assembly method is only applicable to small-size vacuum heat insulation plates. When this method is used to support large-size vacuum heat insulation plates, the quality problem of air bubbles caused by uneven foaming or flow failure is likely to occur.

[0028] Considering that the vacuum heat insulation plates used in multi-door refrigerators are usually large in size (for example, 1250*450*10mm), the vacuum heat insulation plates need to be bonded.

[0029] In some embodiments, the vacuum heat insulation plate of the refrigerator is bonded to the flat side plate or flat back plate on both sides of the refrigerator. During assembly, the vacuum heat insulation plate is first subjected to hot melt adhesive spraying, then bonded to the side plate of the refrigerator, and finally subjected to pressing. After the inner tank of the refrigerator is assembled, the foaming process is performed, and the box body is completed. One side of the vacuum heat insulation plate has pressure-sensitive adhesive, and a layer of release paper is applied to the surface. The release paper is torn off before use, and then bonded to the corresponding position.

[0030] Because some side plates of the refrigerator have 4-8 rows of condenser pipes, if the vacuum heat insulation plate is directly bonded to the side plate with the condenser pipes, there will be a large gap between the vacuum heat insulation plate and the condenser, which will cause quality problems such as unstable bonding of the vacuum heat insulation plate and foaming voids of the side plate.

[0031] To solve the above problems, the application provides a bonding method for a vacuum heat insulation plate of a refrigerator, which avoids the problems of the bonding method for a vacuum heat insulation plate of a refrigerator.

[0032] As Figure 1 shown, the refrigerator vacuum insulation board provided by the application, the method comprises the following steps:

[0033] Step 1: one side of the condenser tube is attached to the aluminum foil plate with adhesive tape;

[0034] Before installing the vacuum insulation board, the condenser tube needs to be fixed on the aluminum foil plate. The thickness of the aluminum foil plate is 0.2-0.4mm.

[0035] In order to make the installation of the vacuum insulation board convenient, during the installation of the vacuum insulation board, a transparent plexiglass or glass is used for semi-sealing (i.e. the side and top are closed, and the two ends are not closed for material import and export), and a tungsten filament lamp or air conditioner is used for temperature control inside the transparent plexiglass or glass.

[0036] When the side plate is formed on the assembly line, it enters the semi-closed "aluminum foil" process, and the aluminum foil can be attached by automatic equipment. The side plate is heated when it enters the process to ensure that the reaction temperature is within the range of 45-55℃.

[0037] A piece of aluminum foil plate with a thickness of 0.2-0.4mm is laid flat, and the condenser tube is attached to the aluminum foil plate with aluminum foil tape, and the position and method are consistent with the state of attachment to the side plate.

[0038] Among them, a layer of aluminum foil tape is pasted on the surface of the condenser tube for fixing the condenser, which is also conducive to expanding the heat dissipation area of the condenser and improving the heat dissipation effect. In one possible implementation, the diameter of the condenser tube is 3-6mm.

[0039] Step 2: place the aluminum foil plate with the attached condenser tube at the bottom of the foaming mold, and attach the vacuum insulation board to the other side of the condenser tube;

[0040] Place the aluminum foil plate with the condenser tube at the bottom of the foaming mold, then place the vacuum insulation board on the condenser tube, and the position is consistent with the state of attachment to the side plate. Then close the mold to ensure normal foaming reaction. In one possible implementation, the mold size is slightly wider than the VIP plate in length and width, and the upper and lower positions are reserved for 5-20mm. The mold height is 3-15mm higher than the total height.

[0041] Step 3: after the vacuum insulation board is attached, spray foaming material into the containing groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, and the volume ratio of the isocyanate and the polyether polyol is 1:1; after a period of curing, open the mold to take out.

[0042] After the side plate is pasted with the condensing pipe, a layer of polyurethane foaming material is sprayed at the position where the vacuum insulation board needs to be bonded, the polyurethane foaming material is filled into the condensing pipe to achieve the effect of filling the condensing pipe with the polyurethane foaming material, and then the vacuum insulation board is placed on the foaming material by using the bonding effect of the polyurethane foaming material, so that the vacuum insulation board is flatly pasted on the side plate with the condensing pipe after pressing. Since the polyurethane foaming material has good adhesion, the vacuum insulation board can cancel the pressure-sensitive adhesive and the surface release paper on one side.

[0043] The polyurethane foaming material can be composed of the following parts: A material isocyanate (specifically, coarse MDI, that is, polyphenylmethane polyisocyanate), B material polyether polyol (ether substances, etc.), physical foaming agent (cyclopentane, 245fa, 134a, LBA, etc.), chemical foaming agent (water), and additive (silicone oil, etc.).

[0044] Since the polyurethane foaming material needs to be fully mixed with A and B components to form the filling and bonding effect, the polyurethane foaming material is fully mixed and then injected into the foaming mold, and the reaction is completed in 45-60 seconds under the condition that the temperature of the foaming mold is 40-55℃. Because the polyurethane raw material needs a long time to complete the reaction, the long reaction time will reduce the installation efficiency of the vacuum insulation board, and the long reaction time of the polyurethane raw material will also affect the adhesion, so that the vacuum insulation board is not firmly bonded.

[0045] Therefore, in order to improve the reaction time of the polyurethane raw material, the polyurethane raw material is optimized. In one possible implementation, the isocyanate is one or more combinations of polyphenylmethane polyisocyanate and diphenylmethane-4,4-diisocyanate. The mass ratio of the polyphenylmethane polyisocyanate to the diphenylmethane-4,4-diisocyanate is 7:3. In one possible implementation, the polyether polyol is a polyether mixture.

[0046] By increasing the diphenylmethane-4,4-diisocyanate in the isocyanate, the activity of the A material can be improved, the reaction strength and speed can be increased, the reaction can be more intense in unit time, and more heat can be released, so as to further promote the reaction speed and shorten the reaction time. By increasing 35% polyether in the B material polyether polyol, the toughness and bonding strength of the foam can be enhanced, and the bonding performance can be improved. Since the physical foaming agent will be gasified by absorbing heat during the reaction, it is not conducive to the bonding and rapid completion of the reaction of the vacuum insulation board. After the physical foaming agent is cancelled, the reaction speed can be improved. The polyurethane foaming material achieves better bonding performance, faster reaction speed, and is more suitable for bonding through the above optimization.

[0047] In the foaming process of spraying the foaming material in the containing groove of the vacuum insulation board, the mold temperature is 18-22℃, and the environmental temperature is 20-25℃.

[0048] The raw material temperature of the polyurethane foaming material can be controlled between 18-22℃, and the mold temperature can be controlled between 45-55℃. The installation method of the vacuum insulation board provided in the above embodiment is bonding after spraying, and the foaming is open type, so it is difficult to control the mold temperature between 45-55℃. In order to control the raw material temperature between 45-55℃, in a possible implementation, the mold temperature is controlled in the range of 18-22℃, and the ambient temperature is controlled in the range of 20-25℃, so as to facilitate the improvement of the reaction speed.

[0049] In order to ensure that the polyurethane raw material is fully reacted, the foaming material is sprayed into the accommodating groove of the vacuum insulation board by using the electrostatic spraying method or the plasma spraying method, and the spraying time is 5-10s.

[0050] In a possible implementation, when the plasma spraying method is used for spraying, the gun distance is 100-150mm, the air pressure is 0.4-0.7MPa, and the gun moving speed is 250-310cm / s.

[0051] The powder needs a period of time to be heated and accelerated in the plasma flame, so there should be a suitable spraying distance. If the spraying distance is too close, the powder will be poorly heated, the impact deformation will not be sufficient, the coating quality will be affected, the substrate will be seriously oxidized by the plasma flame, and the substrate temperature will be too high, causing thermal deformation. If the spraying distance is too far, the powder that has been heated to a molten state will cool down when it contacts the part, and the flight speed will also begin to decrease, which will also affect the coating quality and significantly reduce the spraying efficiency. Therefore, in the present application, the gun distance is selected to be 100-150mm.

[0052] The influence of the gun moving speed on the coating quality and the spraying efficiency is not obvious within a certain range. Within a certain powder feeding amount, the slow or fast gun moving speed or the relative speed between the gun and the workpiece means how much the gun sweeps the workpiece area or the thickness of the coating layer per spraying, so adjusting the gun moving speed actually controls the thickness of the coating layer per spraying. The thickness of the coating layer per spraying should not be too thick. In some embodiments, the thickness of the coating layer per spraying is less than or equal to 0.25mm, and for the coating layer with a required spraying thickness of 0.25mm, two or more times of spraying should be used for forming. In addition, the gun moving speed also affects the temperature rise of the workpiece. In order to prevent the local temperature rise of the substrate from being too high and causing thermal deformation or excessive thermal stress, a faster gun moving speed is selected under the premise of ensuring coverage. Therefore, the gun moving speed can be selected to be 250-310cm / s.

[0053] In a possible implementation, when the plasma spraying method is used for spraying, the temperature of the sprayed substrate is 15-20℃.

[0054] The temperature of the base metal is an important parameter of the spraying process. Most workpieces need to be preheated before spraying, the purpose is to remove moisture and activate the surface, which is conducive to the bonding of the coating and the base metal, and to control the thermal expansion of the base metal relative to the coating. For some thin-walled parts, the stress caused by the inconsistent shrinkage of the parts and the coating during cooling after spraying can be reduced, thereby facilitating the bonding of the coating and the base metal. Preheating before spraying can also reduce the decrease in fatigue strength of the parts after spraying. However, when the preheating temperature of the metal parts exceeds 200°C, the surface of the parts begins to form a serious oxide film, which leads to a significant decrease in the bonding strength of the coating.

[0055] Both too high and too low temperatures can affect the drying process of the coating. If the temperature is too high, the solvent will volatilize too quickly, resulting in dry spraying during spraying; the two-component coating has a short activation time, the viscosity of the coating rises quickly and is quickly dried, resulting in scrap; the coating is prone to cracking, wrinkling, pinholes, bubbles and other abnormalities. If the temperature is too low, the flowability of the coating is poor, the coating is rough and has poor density, the mutual solubility of the components of the coating is poor, the viscosity of the coating rises or partially separates, and is prone to cause particle or pinhole defects. Therefore, the substrate temperature for spraying is selected to be 18-25°C in this application.

[0056] Step 4: After the foaming material is reacted and expanded, the vacuum heat insulation plate is bonded to the side plate of the refrigerator by an adhesive. In one possible implementation, the adhesive is one or a combination of epoxy resin, phenolic resin, urea-formaldehyde resin, polyurethane, polyvinyl acetal, perchloroethylene resin, neoprene, and nitrile rubber.

[0057] The application optimizes the raw materials of the polyurethane foaming material to improve the bonding performance and reaction speed of the foaming material; and controls the temperature of the raw materials, the temperature of the materials, and the environmental temperature to effectively alleviate the problem of foaming and layering during the bonding process of the vacuum heat insulation plate on the side plate with a condenser tube.

[0058] Embodiment

[0059] An aluminum foil plate with a thickness of 0.2-0.4 mm is laid flat, the condenser tube is attached to the aluminum foil plate with aluminum foil tape, the position and method are consistent with the attachment state of the side plate, and semi-sealing is performed with transparent glassine paper or glass using a tungsten lamp or air conditioning to control the temperature. After the aluminum foil is attached, the foaming process is entered, the side plate is positioned after 1.5 s, and then the automatic nozzle sprays a layer of polyurethane foaming material at the position corresponding to the vacuum heat insulation plate, wherein the foaming material includes isocyanate and polyether polyol, the volume ratio of the isocyanate and the polyether polyol is 1:1, the isocyanate is a polyphenylmethane polyisocyanate and a diphenylmethane-4,4-diisocyanate with a mass ratio of 7:3, and the polyether polyol is a polyether mixture. When the spraying is performed by using the plasma spraying method, the gun spacing is 160 mm, the air pressure is 0.4 MPa, the spraying time of the foaming material is 5 s, and the gun moving speed is 300 cm / s. When the spraying is performed by using the plasma spraying method, the substrate temperature of the spraying is 18℃, and the environmental temperature is controlled at 25℃.

[0060] After spraying, the polyurethane foaming material starts to react, and after the foaming material is expanded, the vacuum heat insulation plate is adhered to the side plate of the refrigerator by an adhesive, wherein the schematic diagram of the adhesion is shown in Figure 2 .

[0061] It can be known from the above embodiments that the application provides a vacuum heat insulation plate adhesion method of a refrigerator, including: attaching one side of a condenser tube to an aluminum foil plate with adhesive tape; placing the aluminum foil plate with the attached condenser tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condenser tube; after the vacuum heat insulation plate is attached, spraying a foaming material in the accommodating groove of the vacuum heat insulation plate; wherein the foaming material includes isocyanate and polyether polyol, and the volume ratio of the isocyanate and the polyether polyol is 1:1; after foaming and expansion, the vacuum heat insulation plate is adhered to the side plate of the refrigerator by an adhesive. The composition of the foaming material is improved in the application, the adhesion performance of the material can be increased, the foaming reaction can be faster, and thus the problem of foaming and layering in the adhesion process of the vacuum heat insulation plate of the refrigerator is alleviated.

[0062] The similar parts between the embodiments provided by the application can be referred to each other, the specific embodiments provided above are only a few examples under the general concept of the application, and do not constitute a limitation on the protection scope of the application. For those skilled in the art, any other embodiments extended according to the application scheme without creative labor are within the protection scope of the application.

Claims

1. A method of bonding a vacuum insulation panel of a refrigerator, characterized by, The method comprises the following steps: attaching one side of the condenser tube to the aluminum foil plate with adhesive tape; placing the aluminum foil plate with the attached condenser tube at the bottom of the foaming mold, and attaching a vacuum insulation plate to the other side of the condenser tube; after the vacuum insulation plate is attached, spraying foaming material into the accommodating groove of the vacuum insulation plate; wherein the foaming material comprises isocyanate and polyether polyol, and the volume ratio of the isocyanate and the polyether polyol is 1:1; after the foaming material expands, the vacuum insulation plate is adhered to the side plate of the refrigerator by adhesive.

2. The method of claim 1, wherein the vacuum insulation panel is adhered to the refrigerator by using an adhesive. The isocyanate is one or more combinations of polyphenylmethane polyisocyanate and diphenylmethane-4,4-diisocyanate.

3. The method of claim 2, wherein the vacuum insulation panel is adhered to the refrigerator by using an adhesive. The foaming material comprises the polyphenylmethane polyisocyanate and the diphenylmethane-4,4-diisocyanate, and the mass ratio of the polyphenylmethane polyisocyanate and the diphenylmethane-4,4-diisocyanate is 7:

3.

4. The method of claim 1, wherein the vacuum insulation panel is adhered to the refrigerator by using an adhesive. The polyether polyol is a polyether mixture.

5. The method of claim 1, wherein the vacuum insulation panel is adhered to the refrigerator by using an adhesive. The thickness of the aluminum foil plate is 0.2-0.4 mm.

6. The method of claim 5, wherein the vacuum insulation panel is adhered to the refrigerator by using an adhesive. Before attaching one side of the condenser tube to the aluminum foil plate with adhesive tape, the aluminum foil plate is cleaned and dried in an oven at 30-50°C.

7. The method of claim 1, wherein the method further comprises: applying an adhesive to the first and second surfaces of the vacuum insulation panel; and adhering the first and second surfaces of the vacuum insulation panel to the first and second surfaces of the refrigerator, respectively. The adhesive is one or more combinations of epoxy resin, phenolic resin, urea-formaldehyde resin, polyurethane, polyvinyl acetal, perchloroethylene resin, neoprene, and nitrile rubber.

8. The method of claim 7, wherein the vacuum insulation panel is adhered to the refrigerator by using an adhesive. Before the vacuum insulation plate is adhered to the side plate of the refrigerator by adhesive, the method further comprises: adhering a layer of release paper with a thickness of 0.12-0.20 mm to the other side of the aluminum foil plate by adhesive.

9. The method of claim 8, wherein the vacuum insulation panel is adhered to the refrigerator by a double-sided tape. The height of the mold is greater than the height of the vacuum insulation plate, and the height difference between the mold and the vacuum insulation plate is 3-15 mm.

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