Vacuum insulation panel

Abstract

The vacuum insulation panel comprises: an outer cover material forming an accommodation space therein; and a core material disposed in the accommodation space. The core material comprises: a core layer extending in the longitudinal direction of the outer cover material; and a coating layer disposed between the outer cover material and the core layer and including a support including porous material and a plurality of plate-shaped materials having a higher flexural modulus than the support, wherein the coating layer has a thickness which is smaller than the thickness of the core layer.

Description

Vacuum insulation panels

[0001] The present disclosure relates to a vacuum insulation panel comprising an improved structure.

[0002] Insulation is used to insulate or block heat. For example, insulation can be used in refrigerators to insulate the interior and exterior of the storage compartment.

[0003] Typically, polyurethane foam can be used as insulation in refrigerators. However, polyurethane foam needs to be thick enough to provide adequate insulation for refrigerator use, which can reduce the storage space inside the refrigerator.

[0004] Vacuum insulation panels (VIPs) have lower thermal conductivity than polyurethane foam, allowing them to be manufactured thinner than polyurethane foam while still providing the desired insulation effect for refrigerators. Therefore, attempts are being made to use VIPs in refrigerators.

[0005] Vacuum insulation panels (VIPs) are insulation materials that encase a core material with multiple outer layers, with the interior vacuumed. While vacuum insulation panels offer superior insulation performance, their core material is mostly vacuumed, and the outer layer is thin, which can lead to insufficient rigidity.

[0006] One aspect of the present disclosure provides a vacuum insulation panel including a structure having improved rigidity.

[0007] One aspect of the present disclosure provides a vacuum insulation panel including a structure in which insulation performance is maintained.

[0008] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0009] A vacuum insulation panel according to the invention comprises a shell material forming an internal accommodation space and a core material disposed within the accommodation space. The core material comprises a core layer extending in the longitudinal direction of the shell material, a support material disposed between the shell material and the core layer, the support material including a porous material, and a plurality of plate-shaped materials having a higher flexural modulus than the support material, and a coating layer having a thickness thinner than the core layer.

[0010] A vacuum insulation panel according to the invention comprises a shell material having an internal space formed therein and including a plurality of shell layers, and a core material disposed within the space. The core material comprises a core layer including glass wool extending in the longitudinal direction of the shell material, a support material including a porous material disposed to contact the shell material and the core layer, and a coating layer including a plurality of plate-like materials having a higher flexural modulus than the support material, wherein the volume ratio of the plurality of plate-like materials to the volume of the core material is 2.7 vol% or more.

[0011] A vacuum insulation panel according to the invention comprises a shell material having an internally formed accommodation space and including a plurality of shell layers, and a core material disposed within the accommodation space. The core material comprises a core layer extending in the longitudinal direction of the shell material, a support material disposed to be in contact with the shell material and the core layer, respectively, and including a porous material, and a coating layer comprising a plurality of plate-like materials having a higher flexural modulus than the support material. The coating layer comprises a first coating layer in contact with one surface of the core layer, and a second coating layer spaced apart from the first coating layer and in contact with the other surface of the core layer, and the volume ratio of the plurality of plate-like materials to the volume of the core material is provided to be 2.7 vol% or more and 3.6 vol% or less, and a thickness of the first coating layer or the second coating layer is 0.1 times or less the thickness of the core layer.

[0012] FIG. 1 is a schematic drawing of a vacuum insulation panel according to one embodiment.

[0013] Fig. 2 is a cross-sectional view of the vacuum insulation panel of Fig. 1 taken along line a-a'.

[0014] Figure 3 is a drawing showing an enlarged view of area A1 of Figure 2.

[0015] Figure 4 is a drawing showing an enlarged view of area A2 of Figure 2.

[0016] Figure 5 is a drawing showing an enlarged view of area A3 of Figure 3.

[0017] FIG. 6 is a diagram conceptually illustrating a process of peeling off a plurality of plate-like materials from vermiculite in a vacuum insulation panel according to one embodiment.

[0018] Figure 7 is a conceptual drawing illustrating a process of forming a coating layer by mixing a plurality of peeled plate-like materials of Figure 6 with glass wool.

[0019] FIG. 8 is a drawing showing a core material separated from a vacuum insulation panel according to one embodiment.

[0020] FIG. 9 is a drawing illustrating a process of coating a core layer on a coating layer in a vacuum insulation panel according to one embodiment.

[0021] Fig. 10 is a schematic drawing showing a vacuum insulation panel according to one embodiment being deformed by receiving an external force.

[0022] FIG. 11 is a conceptual diagram illustrating how heat is transferred through a vacuum insulation panel according to one embodiment.

[0023] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and there may be various modified examples that can replace the embodiments and drawings of this specification at the time of filing of this application.

[0024] Additionally, the same reference numbers or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0025] In addition, the terminology used in this specification is used to describe embodiments and is not intended to limit and / or restrict the disclosed invention. The singular expression includes plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0026] Additionally, terms including ordinal numbers such as "first", "second", etc. used herein may be used to describe various components, but the components are not limited by the terms, and the terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term "and / or" includes any combination of a plurality of related listed items or any item among a plurality of related listed items.

[0027] Meanwhile, the shape and position of each component are not limited by the terms such as “front,” “back,” “left,” “right,” “upper,” and “lower” used in the description below.

[0028] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0029] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0030] When referring to the direction of rotation, clockwise may be referred to as the first direction, and counterclockwise, the direction opposite to the first direction, may be referred to as the second direction. While these expressions may be commonly used to describe specific details for implementing the invention, the rotational direction of the components of the present invention is not limited by these terms.

[0031] Hereinafter, a vacuum insulation panel (1) according to various embodiments will be specifically described with reference to the attached drawings.

[0032] Fig. 1 is a schematic drawing of a vacuum insulation panel according to one embodiment. Fig. 2 is a cross-sectional view taken along line a-a' of the vacuum insulation panel of Fig. 1. Fig. 3 is an enlarged view of area A1 of Fig. 2.

[0033] Referring to FIGS. 1 to 3, a vacuum insulation panel (1) may include an outer covering material (10) and a core material (20, 30a, 30b) accommodated in a receiving space (15) formed by the outer covering material (10). The outer covering material (10) may be arranged on the outside of the core material (20, 30a, 30b) to accommodate the core material (20, 30a, 30b). The receiving space (15) of the outer covering material (10) may be provided so that the interior thereof is vacuumed, and the core material (20, 30a, 30b) may be accommodated in the receiving space (15) in a vacuum state (see FIG. 9).

[0034] For example, the core material (20, 30a, 30b) may have a support (21) including a porous material, and the empty space of the porous material may be maintained in a vacuum state, so that the vacuum outer shell material (10) may perform an insulating function. The empty space of the porous material may be referred to as a void (22, described later).

[0035] For example, the support (21) of the core material (20, 30a, 30b) may include glass wool or fumed silica. Hereinafter, the support (21) of the core material (20, 30a, 30b) is illustrated and described as including glass wool (21, Glass Wool), but is not limited thereto.

[0036] For example, the core layer (20, 30a, 30b) may include a core layer (20) extending in the longitudinal direction (+-X direction) of the outer layer (10), and a coating layer (30) disposed between the outer layer (10) and the core layer (20). The coating layer (30) may include a first coating layer (30a) in contact with one surface of the core layer (20), and a second coating layer (30b) disposed spaced apart from the first coating layer (30a) and in contact with the other surface of the core layer (20).

[0037] For example, the first coating layer (30a) may be in contact with the upper surface of the core layer (20), and the second coating layer (30b) may be in contact with the lower surface of the core layer (20). A detailed description of the core layer (20) and the coating layer (30) will be provided later.

[0038] To maintain the interior (15) in a vacuum state, the outer covering (10) may be designed to block the penetration of gases such as air or gas, and moisture. For example, the outer covering (10) may include a moisture and gas barrier film. The core material (20, 30a, 30b) is protected by the outer covering (10) to maintain the insulation life.

[0039] The outer skin (10) may include a plurality of outer skin layers (11, 12, 13, 14). The plurality of outer skin layers (11, 12, 13, 14) may be laminated outwardly to surround the core material (20, 30a, 30b). The plurality of outer skin layers (11, 12, 13, 14) may be formed of different materials. In addition, the plurality of outer skin layers (11, 12, 13, 14) may be formed to include different thicknesses.

[0040] The outer covering material (10) may include a first outer covering layer (14). The first outer covering layer (14) may be arranged to surround the outer surface of the core material (20, 30a, 30b) and may be arranged to come into contact with the core material (20, 30a, 30b).

[0041] For example, the first outer layer (14) may include, but is not limited to, LLDPE (Linear low density polyethylene) material. LLDFE can stably support the core material (20, 30a, 30b) by contacting the outer surface of the core material (20, 30a, 30b).

[0042] The outer skin (10) may include a second outer skin layer (11) arranged to be spaced apart from the first outer skin layer (14) in the outward direction. The second outer skin layer (11) may be arranged on the outermost portion of the outer skin material (10).

[0043] For example, the second outer layer (11) may include, but is not limited to, a PA (Polyamide) fiber material. For example, the PA may be made of nylon to prevent external moisture vapor from penetrating the outer layer.

[0044] The outer skin (10) may include a third outer skin layer (12) disposed between the first outer skin layer (14) and the second outer skin layer (11).

[0045] For example, the third outer layer (12) may be arranged to be in contact with the inner surface of the second outer layer (11). For example, the third outer layer (12) may include a PET (Polyethylene Terephthalate) material, but is not limited thereto.

[0046] The outer skin (10) may include a fourth outer skin layer (13) disposed between the first outer skin layer (14) and the second outer skin layer (11).

[0047] For example, the fourth outer layer (13) may be arranged to be in contact with the inner surface of the third outer layer (12). For example, the fourth outer layer (13) may be arranged to be in contact with the outer surface of the first outer layer (14).

[0048] For example, the fourth outer layer (13) may include, but is not limited to, EVOH (Ethylene vinyl alcohol) material. EVOH may be placed on the outside of the core material (20, 30a, 30b) to perform the function of preventing oxygen, carbon dioxide, water vapor, etc. from penetrating into the core material (20, 30a, 30b).

[0049] For example, any one of the above-described outer layers (11, 12, 13, 14) may include PVDF (Polyvinylidene Fluoride). For example, all of the above-described outer layers (11, 12, 13, 14) may include PVDF (Polyvinylidene Fluoride).

[0050] For example, the outer covering material (10) may be made of aluminum (AL) or aluminum oxide (ALO). x ) may not contain metal or metal oxide materials such as . Through this, thermal bridge phenomena such as those through the outer covering material (10) can be prevented.

[0051] Fig. 4 is an enlarged view of area A2 of Fig. 2. More specifically, Fig. 4 is an enlarged view of the core layer (20) of the core material (20, 30a, 30b).

[0052] Referring to FIG. 4, the core material (20, 30a, 30b) may include a core layer (20) extending in the longitudinal direction (+-X direction) of the outer covering material (10). As described above, the core layer (20) may include glass wool.

[0053] Glass wool (21) may include glass fibers (211). The glass fibers (211) may extend along the longitudinal direction (+-X direction) of the outer covering material (10). In the drawing, the glass fibers (211) are shown as being formed to be bent in a roughly spiral direction, but this is only a conceptual expression of the glass fibers (211) forming the glass wool (21), and the glass fibers (211) may have various shapes and form the glass wool (21).

[0054] The glass wool (21) of the core layer (20) may include a plurality of glass fibers (211). The glass wool (21) may provide rigidity to the core material (20, 30a, 30b) so that the core material (20, 30a, 30b) maintains its shape, and may play a role in supporting the vacuum insulation panel (1).

[0055] For example, the glass wool (21) may be a porous material. That is, the glass wool (21) of the core layer (20) may include a plurality of glass fibers (211) and pores (22) formed by arranging the plurality of glass fibers (211). In other words, the plurality of glass fibers (211) may be arranged irregularly, thereby forming pores (22) within the glass wool (21).

[0056] For example, the void (22) may refer to an empty space inside the glass wool (21). As will be described later, when the core layer (20) is placed in a vacuum-like receiving space (15), the void (22) may also be maintained in a vacuum-like state.

[0057] For example, the flexural modulus of glass wool (21) can be set to 180 MPa. For example, the thermal conductivity of glass wool (21) can be set to 2 mW / mK. This will be described later.

[0058] Fig. 5 is an enlarged view of area A3 of Fig. 3. Fig. 6 is a conceptual diagram illustrating a process of peeling off a plurality of plate-like materials from vermiculite in a vacuum insulation panel according to one embodiment. Fig. 7 is a conceptual diagram illustrating a process of mixing the peeled off plurality of plate-like materials of Fig. 6 with glass wool (21) to form a coating layer.

[0059] Referring to FIGS. 5 to 7, the coating layer (30) may include a support (21) forming an outer shape and a plate-shaped material (33).

[0060] For example, the support (21) may include a porous material and extend in the longitudinal direction (+-X direction) of the outer covering material (10). For example, the support (21) may include glass wool including glass fiber (211). Hereinafter, the support (21) will be described as being glass wool, but is not limited thereto.

[0061] As previously discussed, the glass wool (21) may include a plurality of glass fibers (211) that are arranged irregularly with each other and a gap (22) formed by the arrangement of the plurality of glass fibers (211).

[0062] The coating layer (30) may include a plate-shaped material (33) that is prepared to be mixed with the support (21).

[0063] For example, the plate-like material (33) may include vermiculite sheets (33) formed by peeling off verminulite (V). That is, the plate-like material (33) may include vermiculite material (V).

[0064] Hereinafter, the plate-like materials (33) are explained assuming that they are vermiculite sheets (33). The plate-like materials (33) may include a plurality of plate-like materials (33). For example, a plurality of plate-like materials (33) may be arranged within the pores (22) of the support (21).

[0065] For example, the vermiculite sheet (33) may include a higher flexural modulus than the glass fiber (211) of the glass wool (21). In addition, the coating layer (30) is formed by mixing the glass fiber (211) and the vermiculite sheet (33), and thus may have a higher flexural modulus than the core layer (20) having the glass wool (21). Therefore, compared to a case where it is formed only with the glass wool (21), a core material (20, 30a, 30b) including the core layer (20) and the coating layer (30) may be formed having a higher flexural modulus. A detailed description of the flexural modulus of the core material (20, 30a, 30b) will be described later.

[0066] Below, the process of forming a coating layer (30) by mixing a support (21) and a plate-shaped material (33) is examined.

[0067] As previously discussed, vermiculite sheets (33), which are a plurality of plate-like materials (33), can be formed by peeling off vermiculite as a raw material. Vermiculite processed into expanded vermiculite can have impurities removed by utilizing a density gradient separation method.

[0068] Afterwards, after mixing with water at a mass ratio of 1:1 with NaCl at a concentration of 50 mg / ml, a ball milling process is performed at 400 to 1000 rpm to separate vermiculite sheets (33), which are multiple plate-like materials (33), from the vermiculite (V). In addition, ultrasonic and centrifugal separation steps may be performed to separate the multiple plate-like materials (33) more effectively.

[0069] The plurality of plate-shaped materials (33) separated through the above process can be mixed with water (W) and a support (21) including glass wool (21). In this process, the plurality of plate-shaped materials (33) can be uniformly arranged within the pores (22) of the support (21).

[0070] Afterwards, when the mixture of the support (21) and the plurality of plate-shaped materials (33) is taken out of the water (W) and dried, a coating layer (30) can be formed.

[0071] The coating layer (30) may include a first coating layer (30a) that contacts one surface of the core layer (20) and a second coating layer (30b) that contacts the other surface of the core layer (20). In FIG. 5, the first coating layer (30a) manufactured using the above-described coating layer (30) is illustrated as an example, but it goes without saying that the second coating layer (30b) may also be manufactured using the above-described coating layer (30).

[0072] FIG. 8 is a drawing illustrating a vacuum insulation panel according to one embodiment, with the core material separated. FIG. 9 is a drawing illustrating a process of coating a core layer on a coating layer (30) in a vacuum insulation panel according to one embodiment. FIG. 10 is a drawing schematically illustrating a vacuum insulation panel according to one embodiment being deformed by receiving an external force. FIG. 11 is a drawing conceptually illustrating a process of heat being transferred while passing through a vacuum insulation panel according to one embodiment.

[0073] In order for the vacuum insulation panel (1) to perform a stable insulating function suitable for its intended use, the vacuum insulation panel (1) must have a rigidity exceeding a certain value. For example, the vacuum insulation panel (1) may be subjected to external force depending on the usage environment, and as a result, the panel may be deformed by a certain amount of deformation (see Fig. 10). If the vacuum insulation panel (1) does not have sufficient rigidity, the deformation may increase in an environment where an external force is applied, which may damage the panel, and thus, the insulation performance may decrease. Therefore, the vacuum insulation panel (1) needs to have a rigidity exceeding a certain value.

[0074] When determining the rigidity of a vacuum insulation panel (1), the flexural modulus can be used as a criterion. The flexural modulus refers to the ratio of applied stress to the deformation occurring in a bending test, and can be used as a measurement standard for measuring the rigidity of a material.

[0075] In a vacuum insulation panel (1), heat transfer can occur depending on the temperature difference between one side and the other side (see Fig. 11). In other words, in order for the vacuum insulation panel (1) to exhibit insulation performance according to its intended use, it is necessary to have a thermal conductivity below a certain value.

[0076] In the following, it is assumed that the target flexural modulus of the vacuum insulation panel (1) is 300 Mpa or more and the target thermal conductivity is 2.5 mW / mK or less.

[0077] In the vacuum insulation panel (1) according to the present disclosure, the ratio of the thickness of the core layer (20) and the coating layer (30) and the ratio of the volume of the plurality of plate-like materials included in the coating layer (30) to the volume of the core material (20, 30a, 30b) can act as variables that control the above-mentioned flexural modulus and thermal conductivity.

[0078] Hereinafter, the ratio of the thickness of the core layer (20) and the coating layer (30) for the vacuum insulation panel (1) to have the above-mentioned flexural modulus and thermal conductivity values, and the ratio of the volume of the plurality of plate-like materials included in the coating layer (30) to the volume of the core material (20, 30a, 30b) are calculated with reference to FIGS. 8 to 11.

[0079] Hereinafter, for convenience of explanation, the ratio of the thickness of the core layer (20) and the coating layer (30) is referred to as the 'thickness ratio (L' / L1)', and the ratio of the volume of the plurality of plate-like materials included in the coating layer (30) to the volume of the core material (20, 30a, 30b) is referred to as the 'volume ratio (x)'. For example, L2 and L3 may have the same value and may be referred to as L'. This will be described later.

[0080] In the case of the outer covering material (10) of the vacuum insulation panel (1), since the thickness is only several tens of μm, the degree of contribution to the flexural modulus of the entire vacuum insulation panel (1) is very small compared to the core materials (20, 30a, 30b). In addition, the degree of contribution when calculating the thermal conductivity may be low compared to the core materials (20, 30a, 30b). Therefore, in the calculations below, it is assumed that only the flexural modulus and thermal conductivity of the core materials (20, 30a, 30b) are considered. For example, it is assumed that the support (21) is glass fiber (211) forming glass wool (21), and the plurality of plate-like materials (33) are vermiculite sheets (33) exfoliated from vermiculite (V).

[0081] Meanwhile, it can be obtained through experiments that the flexural modulus of glass wool (21) alone is 180 MPa and the thermal conductivity is 2 mW / mK. In addition, the flexural modulus and thermal conductivity of the vermiculite sheet (33), which is a plate-like material (33), can be obtained through the following process.

[0082] First, it is assumed that the test piece contains glass fiber (211) of glass wool (21) at a volume ratio (x) of 10 vol% of the total, and vermiculite sheet (33) is uniformly contained at 5.4 vol% of the total (the remaining area of ​​the test piece, 84.6 vol%, may be in a vacuum state).

[0083] The flexural modulus and thermal conductivity of the specimen were experimentally determined to be 277 MPa and 10 mW / mK, respectively. At this time, the flexural modulus and thermal conductivity of the specimen can be expressed by the following equations according to the Rules of Mixture.

[0084] E' = Eg + Ev * 0.054

[0085] k' = kg + kv * 0.054

[0086] E' is the flexural modulus of the test piece, and k' represents the thermal conductivity of the test piece. Eg is the flexural modulus of the glass fiber (211) of the glass wool (21), and Ev represents the flexural modulus of the vermiculite sheet (33). kg is the thermal conductivity of the glass fiber (211) of the glass wool (21), and kv represents the thermal conductivity of the vermiculite sheet (33).

[0087] As previously discussed, Eg can be 180 MPa and kg can be 2 mW / mK. Therefore, by substituting these values ​​and the values ​​obtained through experiments on the test specimen into the above equation, the flexural modulus and thermal conductivity of the vermiculite sheet (33) itself can be calculated as follows.

[0088] Ev = 1796Mpa

[0089] kv = 148mW / mK

[0090] Below, the formula for the flexural elastic modulus of the vacuum insulation panel (1) is calculated.

[0091] As previously discussed, the core material (20, 30a, 30b) may include a first coating layer (30a), a core layer (20), and a second coating layer (30b). The effective flexural modulus of the core material (20, 30a, 30b), which is a composite material as described above, may be expressed by the following equation.

[0092] Ed = D / I'

[0093] The above Ed is the effective flexural modulus, D is the sum of the flexural moduli of each element forming the core material as a composite, and I' represents the moment of inertia of the core material as a composite.

[0094] D can be expressed as follows.

[0095] D = D1 + D2 + D3

[0096] The above D1 represents the flexural modulus of the core layer (20), D2 represents the flexural modulus of the first coating layer (30a), and D3 represents the flexural modulus of the second coating layer (30b). The flexural modulus of each layer can be expressed by the following equation.

[0097] D1 = E1 * I1

[0098] D2 = E2 * I2

[0099] D3 = E3 * I3

[0100] The above E1 is the modulus of the core layer (20), and I1 refers to the secondary moment of inertia of the core layer (20). The above E2 is the modulus of the first coating layer (30a), and I2 refers to the secondary moment of inertia of the first coating layer (30a). The above E3 is the modulus of the second coating layer (30b), and I3 refers to the secondary moment of inertia of the second coating layer (30b).

[0101] In order to calculate the secondary moment of inertia of each layer, it is assumed that the respective components of Fig. 8 are coupled to each other. In addition, it is assumed that the lower surface of the second coating layer (30b) is the reference point for calculating the secondary moment of inertia.

[0102] First, the Modulus of each layer can be calculated as follows.

[0103] E1 = Eg

[0104] E2 = Eg + Ev * x2 * (L1 + 2 * L2) / (2 * L2)

[0105] E3 = Eg + Ev * x3 * (L1 + 2 * L3) / (2 * L3)

[0106] The above-mentioned x2 may be a volume ratio (x) of the vermiculite sheet (33) included in the first coating layer (30a) with respect to the volume of the entire core material (20, 30a, 30b). The above-mentioned x3 may be a volume ratio (x) of the vermiculite sheet (33) included in the second coating layer (30b) with respect to the volume of the entire core material (20, 30a, 30b). Hereinafter, it is assumed that x1 and x2 have the same value and are expressed as x.

[0107] The above L1 refers to the thickness of the core layer (20), L2 refers to the thickness of the first coating layer (30a), and L3 refers to the thickness of the second coating layer (30b). For example, the thickness may refer to the length in the direction in which the first coating layer (30a), the core layer (20), and the second coating layer (30b) of FIG. 8 are arranged relative to each other. For example, L2 and L3 may be provided to have the same value, which may be expressed as L'. For example, the first coating layer (30a) and the second coating layer (30b) may be provided to have a thickness thinner than the thickness of the core layer (20).

[0108] The above equation allows us to calculate the Modulus of each layer.

[0109] And, the secondary moment of inertia of each layer can be calculated as follows.

[0110] I1 = {(S * L1^3) / 12} + {S * L1 * (z1 - Z) ^2}

[0111] I2 = {(S * L2^3) / 12} + {S * L2 * (z2 - Z) ^2}

[0112] I3 = {(S * L3^3) / 12} + {S * L3 * (z3 - Z) ^2}

[0113] The above S is assumed to have the same value as the width of the first coating layer (30a), the core layer (20), and the second coating layer (30b). The above z1 refers to the distance from the reference point to the center of the core layer (20). The above z2 refers to the distance from the reference point to the center of the first coating layer (30a). The above z3 refers to the distance from the reference point to the center of the second coating layer (30b). The above Z refers to the distance from the reference point to the center of the core material (20, 30a, 30b) in which the first coating layer (30a), the core layer (20), and the second coating layer (30b) are bonded to each other.

[0114] z1, z2, z3, and Z can be expressed as follows.

[0115] z1 = L3 + L1 / 2

[0116] z2 = L3 + L1 + L2 / 2

[0117] z3 = L3 / 2

[0118] Z = L3 + L1 / 2

[0119] By substituting the equations for the modulus and second moment of inertia of each layer summarized above into the equation for the flexural modulus, an equation for the flexural modulus of each layer can be obtained.

[0120] D1 = Eg * {(S * L1^3) / 12}

[0121] <Flexural elastic modulus of core layer (20)>

[0122] D2 = Eg + Ev * x * (L1 + 2 * L2) / (2 * L2) * {(S * L2^3) / 12} + {S * L2 * (L3 + L1 + L2 / 2 - L3 + L1 / 2) ^2}

[0123] <Flexural elasticity of the first coating layer (30a)>

[0124] D3 = Eg + Ev * x * (L1 + 2 * L3) / (2 * L3) * {(S * L3^3) / 12} + {S * L3 * (L3 / 2 - L3 + L1 / 2) ^2}

[0125] <Flexural elastic modulus of the second coating layer (30b)>

[0126] As mentioned above, the sum of D1, D2, and D3 represents D. In addition, in the formula Ed = D / I' for obtaining the effective flexural modulus, the I' value of the composite core material (20, 30a, 30b) can be expressed as follows.

[0127] I' = {S * (L1 + L2 + L3) ^3} / 12

[0128] Now, by substituting the above-described equations for D and I' into the equation for obtaining Ed and rearranging them, the effective flexural modulus of the composite core material (20, 30a, 30b) can be expressed as follows (at this time, the width S is eliminated as a value included in both the numerator and denominator).

[0129] Ed = [[Eg * {(L1^3) / 12}] + [Eg + Ev * L3) * {(L3^3) / 12} + {L3 * (L3 / 2 - L3 + L1 / 2) ^2}]] / [{(L1 + L2 + L3) ^3} / 12]

[0130] <Effective flexural modulus of core material (20, 30a, 30b)>

[0131] As previously discussed, L2 and L3 can be assumed to have various values. This can be expressed as L'. In conclusion, the equation for the flexural modulus of the core material (20, 30a, 30b) has three variables: L1, L' (L2 or L3), and x. That is, it can be expressed as an equation for the volume ratio (x)(x) and the thickness ratio (L' / L1)(L' / L1).

[0132] Below, the formula for the thermal conductivity of the vacuum insulation panel (1) is calculated.

[0133] First, the thermal conductivity at each layer can be expressed as follows.

[0134] k1 = kg

[0135] k2 = kg + kv * x * (L1 + L2 + L3) / (2 * L2)

[0136] k3 = kg + kv * x * (L1 + L2 + L3) / (2 * L3)

[0137] k1 is the thermal conductivity in the core layer (20), k2 is the thermal conductivity in the first coating layer (30a), and k3 is the thermal conductivity in the second coating layer (30b).

[0138] At this time, the core material (20, 30a, 30b), which is a composite of the present disclosure, has a configuration having multiple layers, and the effective thermal conductivity of the composite can be calculated based on the thermal conductivity calculation formula of Multilayer. In addition, the series thermal resistance calculation formula can be utilized for the calculation.

[0139] When the effective thermal conductivity is expressed as K, the following equation can be established.

[0140] (L1 + L2 + L3) / (K*A) = L1 / (k1 * A) + L2 / (k2 * A) + L3 / (k3 * A)

[0141] The above A is the cross-sectional area through which heat passes, and it can be assumed that the first coating layer (30a), the core layer (20), and the second coating layer (30b) all have the same value. If the above equation is rearranged in terms of the effective thermal conductivity K, the thermal conductivity of the core material (20, 30a, 30b) can be expressed as follows (at this time, L2 and L3 have the same value and are denoted as L').

[0142] K = (L1 + 2*L') / [(2*L' / {kg + kv * x * (L1 + 2*L') / (2*L')} + L1 / kg]

[0143] In conclusion, the equation for the thermal conductivity of the core material (20, 30a, 30b) also has three variables, L1, L' (L2 or L3), and x, just like the equation for the flexural modulus. That is, it can be expressed as an equation for the volume ratio (x)(x) and the thickness ratio (L' / L1)(L' / L1).

[0144] In summary, the equations for the flexural modulus and the equation for the thermal conductivity of the core material (20, 30a, 30b) can have L1, L', and x as unknown variables. Assuming that the target flexural modulus of the core material (20, 30a, 30b) is 300 Mpa or more and the target thermal conductivity is 2.5 mW / mK or less, a result including three unknown variables in two equations can be obtained.

[0145] Therefore, below, the values ​​of L1 and L' are determined by assuming the thickness ratio (L' / L1), and then the x value having the target flexural modulus and target thermal conductivity is calculated.

[0146] For example, in manufacturing a vacuum insulation panel (1), both the core layer (20) and the coating layer (30) may include glass wool (21). As previously discussed, the core layer (20) includes only glass wool (21), and the coating layer (30) can be manufactured by mixing a vermiculite sheet (33) with the glass wool (21).

[0147] For example, the core material (20, 30a, 30b) can be manufactured to have a thickness of about 20 cm or less, and one bundle of glass wool (21) can be about 0.555 cm. That is, the core material (20, 30a, 30b) can be manufactured using 36 bundles of glass wool (21), which is merely an example.

[0148] For example, it can be assumed that L1 is 10a and L' is a. That is, it can be assumed that L1 : L' = 10 : 1. Accordingly, it can be assumed that the thickness of the core material (20, 30a, 30b) is 12a by combining the first coating layer (30a), the core layer (20), and the second coating layer (30b). In the case of the above assumption, since 36, which is the number of bundles of glass wool (21) for manufacturing the core material (20, 30a, 30b), is a multiple of 12, it becomes possible to manufacture the core material (20, 30a, 30b) more easily.

[0149] Therefore, in the following, x is determined by assuming that L1 : L' = 10 : 1. As mentioned above, this assumption is merely an example, and it goes without saying that L1 : L' can assume any number of different values.

[0150] By the above assumption, L1 is 10a, L' is a, and the volume ratio (x) is x, so the number of variables can be reduced to two, and since the equation corresponds to two as described above, the range for x can be calculated. That is, when L1: L' = 10:1, the value of x, which is the volume ratio (x) for which the target flexural modulus is 300 Mpa or more and the target thermal conductivity is 2.5 mW / mK or less, can be calculated as having a value greater than 0.027 (0.027 <x, 즉 2.7vol% < x). 해당 범위의 x값의 경우 진공 단열패널(1)의 굴곡 탄성률은 300Mpa 이상이고 목표 열전도도가 2.5mW / mK이하일 수 있다.

[0151] Meanwhile, when x, which is the volume ratio (x) of the vermiculite sheet (33) included in the core material (20, 30a, 30b), increases, a percolation threshold generally occurs, which may increase thermal conductivity and lead to a decrease in the performance of the vacuum insulation panel (1). For example, a desirable value of x for preventing the percolation threshold situation can be calculated by the following equation.

[0152] x < 2 * L' / (2 * L' + L1) * 0.2

[0153] When the above L1: L' = 10: 1 is substituted into the above equation, it can be seen that x must have a volume ratio (x) of 0.033 or less.

[0154] In summary, when L1: L' = 10: 1, the flexural modulus of the vacuum insulation panel (1) is 300 Mpa or more, the thermal conductivity is 2.5 mW / mK or less, and the x value for preventing a decrease in insulation performance due to the percolation threshold can be calculated as 2.7 vol% < x < 3.33 vol%.

[0155] The above values ​​are the range of x assuming L1: L' = 10:1.

[0156] For example, when L1: L' = 11: 1, the flexural modulus is 300 Mpa or more, the thermal conductivity is 2.5 mW / mK or less, and the x value to prevent a decrease in insulation performance due to the percolation threshold may be 2.6 vol% < x < 3.1 vol%.

[0157] For example, when L1: L' = 12: 1, the flexural modulus is 300 Mpa or more, the thermal conductivity is 2.5 mW / mK or less, and the x value to prevent a decrease in insulation performance due to the percolation threshold may be 2.6 vol% < x < 2.8 vol%.

[0158] For example, when L1: L' = 13: 1, the flexural modulus is 300 Mpa or more, the thermal conductivity is 2.5 mW / mK or less, and the x value to prevent a decrease in insulation performance due to the percolation threshold may be 2.6 vol% < x < 2.7 vol%.

[0159] It goes without saying that the above x values ​​can be prepared in various ways by adjusting the ratio of L1: L'.

[0160] When the vermiculite sheet (33) is included in the first coating layer (30a) and the second coating layer (30b) so as to satisfy the above-described volume ratio (x), the first coating layer (30a) and the second coating layer (30b) can be arranged to be in contact with the core layer (20) (see FIG. 9). Thereafter, the first coating layer (30a), the core layer (20), and the second coating layer (30b) can be arranged within the accommodation space (15) formed by the outer covering material (10). For example, the vacuum ejector (P) can discharge air in the accommodation space (15) to the outside to form the accommodation space (15) into a vacuum state (O). When the accommodation space (15) becomes a vacuum state, the atmospheric pressure can become higher than the pressure inside the accommodation space (15). Therefore, the outer covering material (10) can be pressurized in a direction toward the center of the accommodation space (15).

[0161] In the above process, the first outer layer (14) of the outer covering material (10) comes into contact with the first coating layer (30a) and the second coating layer (30b), and the first coating layer (30a) and the second coating layer (30b) can be strongly pressed in the direction toward the center of the receiving space (15). Through this, the first coating layer (30a), the core layer (20), and the second coating layer (30b) received in the receiving space (15) can be strongly adhered to each other and fixed within the receiving space (15).

[0162] A vacuum insulation panel (1) according to the invention includes a shell material (10) forming an accommodation space (15) therein and a core material (20, 30a, 30b) arranged within the accommodation space (15). The core material (20, 30a, 30b) includes a core layer (20) extending in the longitudinal direction of the shell material (10), a support (21) arranged between the shell material (10) and the core layer (20), which includes a porous material, and a plurality of plate-shaped materials (33) having a flexural modulus higher than that of the support (21), and a coating layer (30) having a thickness thinner than that of the core layer (20).

[0163] The above support (21) may include glass wool (21), and the plurality of plate-shaped materials (33) may include vermiculite material.

[0164] The above glass wool (21) includes a plurality of glass fibers (211) that are arranged irregularly and a gap (22) formed by the arrangement of the plurality of glass fibers (211), and the plurality of plate-shaped materials (33) can be arranged within the gap (22).

[0165] The coating layer (30) may include a first coating layer (30a) that is in contact with one surface of the core layer (20) and a second coating layer (30b) that is spaced apart from the first coating layer (30a) and in contact with the other surface of the core layer (20).

[0166] The ratio of the volume of the plurality of plate-shaped materials (33) to the volume of the above core material (20, 30a, 30b) can be set to 2.7 vol% or more.

[0167] The ratio of the volume of the plurality of plate-shaped materials (33) to the volume of the above core material (20, 30a, 30b) can be set to 3.33 vol% or less.

[0168] The thickness of the core layer (20) may be set to be at least 10 times the thickness of the first coating layer (30a).

[0169] The flexural elastic modulus of the above vacuum insulation panel (1) can be set to 300 MPa or more.

[0170] The thermal conductivity of the above vacuum insulation panel (1) can be set to 2.5 mW / mK or less.

[0171] The above outer skin (10) may include a first outer skin layer (14) arranged to be in contact with the coating layer (30) and a second outer skin layer (11) spaced apart from the first outer skin layer (14) and forming the outer surface of the vacuum insulation panel (1).

[0172] The first outer layer (14) may include LLDPE (Linear Low Density Polyethylene), and the second outer layer (11) may include PA (Polyamide) fibers.

[0173] The above-mentioned accommodation space (15) can be provided in a vacuum state.

[0174] A vacuum insulation panel (1) according to the invention of the present disclosure includes an outer covering material (10) that forms an accommodation space (15) therein and includes a plurality of outer covering layers, and a core material (20, 30a, 30b) that is arranged within the accommodation space (15). The core material (20, 30a, 30b) includes a core layer (20) including glass wool (21) extending in the longitudinal direction of the outer covering material (10), a support (21) including a porous material and arranged to contact the outer covering material (10) and the core layer (20), and a coating layer (30) including a plurality of plate-shaped materials (33) having a higher flexural modulus than the support (21), and a volume ratio of the plurality of plate-shaped materials (33) to the volume of the core material (20, 30a, 30b) is 2.7 vol% or more.

[0175] The ratio of the volume of the plurality of plate-shaped materials (33) to the volume of the above core material (20, 30a, 30b) can be set to 3.33 vol% or less.

[0176] The above support (21) may include glass wool (21), and the plurality of plate-shaped materials (33) may include vermiculite material.

[0177] The above glass wool (21) includes a plurality of glass fibers (211) that are arranged irregularly with each other and a gap (22) formed by arranging the plurality of glass fibers (211), and the plurality of plate-shaped materials (33) can be arranged to be distributed within the gap (22).

[0178] The coating layer (30) includes a first coating layer (30a) that contacts one surface of the core layer (20) and a second coating layer (30b) that is spaced apart from the first coating layer (30a) and contacts the other surface of the core layer (20), and the thickness of the core layer (20) can be provided to be 10 times or more the thickness of the first coating layer (30a) or the second coating layer (30b).

[0179] The above vacuum insulation panel (1) can be provided with a flexural modulus of 300 MPa or more and a thermal conductivity of 2.5 mW / mK or less.

[0180] The above-described plurality of outer layers may include a first outer layer (14) that is arranged to be in contact with the coating layer (30) and includes LLDPE (Linear Low Density Polyethylene) and a second outer layer (11) that is spaced apart from the first outer layer (14) and includes PA (Polyamide)-based fibers.

[0181] A vacuum insulation panel (1) according to the invention includes an outer covering (10) having a receiving space (15) formed therein and including a plurality of outer covering layers, and a core material (20, 30a, 30b) disposed within the receiving space (15). The core material (20, 30a, 30b) includes a core layer (20) extending in the longitudinal direction of the outer covering (10), and a coating layer (30) disposed to contact the outer covering (10) and the core layer (20), respectively, and including a support (21) including a porous material, and a plurality of plate-shaped materials (33) having a higher flexural modulus than that of the support (21). The coating layer (30) includes a first coating layer (30a) that contacts one surface of the core layer (20), and a second coating layer (30b) that is spaced apart from the first coating layer (30a) and contacts the other surface of the core layer (20), and is provided so that the volume ratio of the plurality of plate-shaped materials (33) with respect to the volume of the core material (20, 30a, 30b) is 2.7 vol% or more and 3.6 vol% or less, and the thickness of the first coating layer (30a) or the second coating layer (30b) is 0.1 times or less the thickness of the core layer (20).

[0182] According to the invention of the present invention, since the core material includes a coating layer including a plurality of plate-like materials having a high flexural modulus, the rigidity of the vacuum insulation panel can be secured.

[0183] According to the invention, a vacuum insulation panel having high rigidity and low thermal conductivity can be manufactured by including a plurality of plate-like materials in a coating layer at a specific volume ratio.

[0184] According to the idea of ​​the present disclosure, a vacuum insulation panel having high rigidity and low thermal conductivity can be manufactured by forming the ratio of the thickness of the coating layer to the thickness of the core layer to have a specific value.

[0185] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0186] The above illustrates and describes specific embodiments. However, the invention is not limited to the above-described embodiments, and those skilled in the art will readily appreciate that various modifications and implementations can be made without departing from the spirit and scope of the invention as set forth in the claims below.

Claims

1. An outer covering material forming an internal space; and Includes a core material placed within the above-mentioned receiving space; The above heart material is, a core layer extending in the longitudinal direction of the above outer covering material; and A vacuum insulation panel comprising a support material disposed between the outer covering material and the core layer, the support material including a porous material, and a plurality of plate-shaped materials having a higher flexural modulus than the support material, and a coating layer having a thickness thinner than the thickness of the core layer.

2. In paragraph 1, The above support includes glass wool, The above plurality of plate-like materials are vacuum insulation panels containing vermiculite material.

3. In paragraph 2, The above glass wool includes a plurality of glass fibers that are arranged irregularly and a gap formed by the arrangement of the plurality of glass fibers. A vacuum insulation panel in which the above plurality of plate-shaped materials are placed within the above gap.

4. In paragraph 2, The above coating layer is, A first coating layer in contact with one surface of the core layer and A vacuum insulation panel comprising a second coating layer spaced apart from the first coating layer and in contact with the other surface of the core layer.

5. In paragraph 1, A vacuum insulation panel in which the ratio of the volume of the plurality of plate-shaped materials to the volume of the core material is provided to be 2.7 vol% or more.

6. In paragraph 5, A vacuum insulation panel in which the ratio of the volume of the plurality of plate-shaped materials to the volume of the core material is provided to be 3.33 vol% or less.

7. In paragraph 4, A vacuum insulation panel in which the thickness of the core layer is provided to be at least 10 times the thickness of the first coating layer.

8. In paragraph 1, A vacuum insulation panel having a flexural modulus of 300 MPa or more.

9. In paragraph 1, A vacuum insulation panel having a thermal conductivity of 2.5 mW / mK or less.

10. In paragraph 1, The above outer covering material is, A first outer layer provided to be in contact with the above coating layer, and A vacuum insulation panel comprising a second outer layer spaced apart from the first outer layer and forming the outer surface of the vacuum insulation panel.

11. In paragraph 10, The first outer layer comprises LLDPE (Linear Low Density Polyethylene), The above second outer layer is a vacuum insulation panel containing PA (Polyamide) fibers.

12. In paragraph 1, The above-mentioned accommodation space is a vacuum insulation panel provided in a vacuum state.

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