CN203126053U - Vacuum thermal insulating plate - Google Patents

Abstract

The utility model provides a vacuum thermal insulating plate, and in particular relates to a vacuum thermal insulating plate with excellent thermal insulating performance and high mechanical strength. The vacuum thermal insulating plate comprises a sealing layer and a core material, wherein the core material is a plate formed by glass fiber, pulverized silica or foam polyurethane and keeps vacuum inside; the sealing layer seals the core material; the sealing layer is a multilayer structural body; and an ethylene-vinyl alcohol copolymer layer is formed in the innermost layer of the multilayer structural body. The vacuum thermal insulating plate is excellent in vacuum thermal insulating performance and high in mechanical strength.

Description

vacuum insulation panel

technical field

The utility model relates to a vacuum heat insulation board, in particular to a vacuum heat insulation board with excellent heat insulation performance and high mechanical strength.

Background technique

Vacuum insulation panels are generally used in refrigerators to increase the thermal insulation effect by being placed between the outer surface and inner surface of the refrigerator chamber to improve refrigeration efficiency.

Specifically, the vacuum insulation panel includes a core material, a sealing layer, and a getter, wherein the core material has a plate formed of glass fiber, powdered silica, or foamed polyurethane, and the inside thereof is kept vacuum; the sealing layer is used to seal and cover the core material To maintain the vacuum of the core material; the getter keeps the high vacuum degree of the vacuum insulation panel, that is, the heat insulation performance, for a long enough time by removing the gas that passes through the sealing layer and flows into the sealing layer.

The sealing layer is usually a multilayer structure. Conventional sealing layers are generally composed of a heat-sealing layer in contact with the core material formed of the innermost layer of linear low-density polyethylene, an aluminum foil layer, a protective layer, and the like.

The core material is covered from both sides with two sealing layers under vacuum conditions, and then the heat-sealing layers of the two sealing layers are melted together, thereby isolating the core material from the outside world.

However, often due to poor gas barrier properties of the sealing layer, the thermal insulation performance of the vacuum insulation panel deteriorates over time.

Utility model content

The purpose of the utility model is to provide a vacuum heat insulation panel with excellent heat insulation performance and high mechanical strength.

To achieve this purpose, the vacuum insulation panel of the present invention includes a sealing layer 13 and a core material 12. The core material 12 is a plate formed by glass fiber, powdered silica or foamed polyurethane, and the inside thereof is kept vacuum, and the sealed The layer 13 seals the core material 12, wherein the sealing layer 13 is a multilayer structure, and the innermost layer of the multilayer structure is an ethylene-vinyl alcohol copolymer layer (EVOH layer).

Further, the EVOH layer is an unstretched EVOH layer 4 .

Further, the multilayer structure is composed of four layers, including a layer of unstretched EVOH layer 4, a layer of aluminum foil 3, a layer of aluminized polyethylene terephthalate (aluminized PET layer) 2 and a polyamide layer (ONY layer)1.

Furthermore, the one ONY layer 1 is the outermost layer of the multilayer structure, and the one aluminum-coated PET layer 2 is located outside the one layer of aluminum foil 3 .

Wherein, the thickness of the unstretched EVOH layer 4 is 15-30 μm, the thickness of the aluminum foil 3 is 6-10 μm, the thickness of the aluminized PET layer 2 is 12 μm, and the thickness of the ONY layer 1 is 10-10 μm. 30 μm.

Wherein, the thickness of the unstretched EVOH layer 4 is 15 or 20 or 30 μm, the thickness of the aluminum foil 3 is 6.5 or 7 μm, the thickness of the aluminized PET layer 2 is 12 μm, and the thickness of the ONY layer 1 is 15 or 25 μm.

The sealing layer of the vacuum heat insulation panel of the utility model is a vacuum heat insulation panel with a multi-layer structure. The sealing layer of the vacuum heat insulation panel can keep the core layer wrapped by it at a sufficiently high vacuum degree, thereby effectively avoiding air Heat transfer caused by convection; the EVOH layer, aluminized PET layer and aluminum foil in the sealing layer can effectively isolate the gas and keep the heat insulation performance of the vacuum insulation panel for a long enough time. The EVOH layer used in the innermost layer can not only meet a certain heat sealing strength, but also has a small gas content in the layer compared with PO, which can effectively maintain the vacuum degree after sealing.

Description of drawings

Fig. 1 is a structural schematic diagram of a vacuum insulation panel of the present invention.

Fig. 2 is a cross-sectional view of a vacuum insulation panel according to an embodiment of the present invention.

In the figure, 1 is the ONY layer, 2 is the aluminized PET layer, 3 is the aluminum foil, 4 is the unstretched EVOH layer, 11 is a part of the sealing layer, 12 is the core material of the vacuum insulation panel, and 13 is the vacuum insulation panel of the sealing layer.

Detailed ways

The vacuum insulation panel of the present invention will be described in detail as follows.

Examples of the polyamide (ONY) used in the present invention include polycaprolactam (nylon 6), polyundecamide (nylon 11), polydodecamide (nylon 12), and the like. Polyamide has the characteristics of toughness, flexibility, strong binding force, wear resistance, oil resistance, water resistance, and enzyme resistance.

As the aluminum-coated polyethylene terephthalate (aluminum-coated PET) used in the utility model, the stretched PET layer is placed in a vacuum to evaporate or sublimate the aluminum, and precipitate on the surface of the stretched PET layer substrate An aluminum film was formed to obtain a composite layer. Aluminized PET has bright metallic luster, good toughness and excellent folding resistance, and has improved barrier properties to gas, water vapor, odor and light compared with before aluminizing.

Ethylene-vinyl alcohol copolymer (EVOH) has excellent gas barrier and excellent processability, and also has excellent transparency, gloss, mechanical strength, stretchability, abrasion resistance, cold resistance and surface strength.

As the EVOH layer used in the utility model, it is usually an EVOH film obtained by a tape-cast extrusion molding method or a down-blown water-cooled extrusion molding method, and stretching treatment may not be performed.

In the vacuum heat insulation panel of the present invention, the aluminized PET is preferably aluminized biaxially stretched PET.

In the vacuum heat insulation panel of the present invention, the coating of the aluminum-coated PET can face outward or inward.

In the vacuum heat insulation panel of the present invention, the sealing layer is a multi-layer structure, and the innermost layer of the multi-layer structure is an EVOH layer. Here, the so-called intermediate layer refers to a layer other than the outermost layer and the innermost layer of the multilayer structure.

Further, the EVOH layer is an unstretched EVOH layer.

Further, the multilayer structure is composed of four layers, including one layer of aluminum foil, one layer of unstretched EVOH, one layer of aluminized PET layer and one layer of ONY.

Furthermore, the one ONY layer 1 is the outermost layer of the multilayer structure, and the one aluminum-coated PET layer is located outside the one layer of aluminum foil.

Wherein, the thickness of the unstretched EVOH layer is 15-30 μm, the thickness of the aluminum foil is 6-10 μm, the thickness of the aluminized PET layer is 12 μm, and the thickness of the ONY layer is 10-30 μm. Preferably, the thickness of the unstretched EVOH layer is 15 or 20 or 30 μm, the thickness of the aluminum foil is 6.5 or 7 μm, the thickness of the aluminized PET layer is 12 μm, and the thickness of the ONY layer is 15 or 25 μm .

The examples of the vacuum insulation panel of the present invention will be described in detail below in conjunction with the accompanying drawings.

Figures 1-2 illustrate a vacuum insulation panel of the present invention.

In Fig. 1, the structure schematic diagram of the vacuum insulation panel of the present invention. Fig. 2 is a cross-sectional view of a part 11 of the sealing layer 13 of the vacuum insulation panel shown in Fig. 1. In Fig. 2, the sealing layer 13 is a multilayer structure comprising a layer of aluminum foil, a layer of A stretched EVOH layer, an aluminized PET layer and an ONY layer. From the outermost layer to the innermost layer of the multilayer structure are ONY layer 1, aluminized PET layer 2, aluminum foil 3 and unstretched EVOH layer 4. Wherein, the thickness of the unstretched EVOH layer 4 is 15-30 μm, the thickness of the aluminized PET layer 2 is 12 μm, the thickness of the ONY layer 1 is 10-30 μm, and the thickness of the aluminum foil 3 is 6-10 μm.

The above description is only illustrative of the present utility model, rather than restrictive. Those of ordinary skill in the art understand that corresponding modifications and changes can be made without departing from the spirit and scope defined by the appended claims. Or equivalent processing, but all will fall within the protection domain of the present utility model.

Claims (6)

1. vacuum insulation panel, comprise sealant (13) and core (12), described core (12) is the plate that is formed by glass fibre, powder silica or polyurathamc, its inner vacuum that keeps, institute's sealant (13) seals described core (12), it is characterized in that described sealant (13) is multilayer structure making, its innermost layer is evoh layer.

2. vacuum insulation panel according to claim 1 is characterized in that described evoh layer is the evoh layer that do not stretch (4).

3. vacuum insulation panel according to claim 2, it is characterized in that described multilayer structure making constitutes by four layers, comprise described one deck do not stretch evoh layer (4), one deck aluminium foil (3), one deck aluminize PETG layer (2) and one deck aramid layer (1).

4. vacuum insulation panel according to claim 3 is characterized in that, described one deck aramid layer (1) is the outermost layer of described multilayer structure making, and described one deck PETG layer (2) of aluminizing is positioned at the outside of described one deck aluminium foil (3).

5. vacuum insulation panel according to claim 4, it is characterized in that, the thickness of the described evoh layer that do not stretch (4) is 15-30 μ m, the thickness of described aluminium foil (3) is 6-10 μ m, described thickness of aluminizing PETG layer (2) is 12 μ m, and the thickness of described aramid layer (1) is 10-30 μ m.

6. vacuum insulation panel according to claim 4, it is characterized in that, the thickness of the described evoh layer that do not stretch (4) is 15 or 20 or 30 μ m, the thickness of described aluminium foil (3) is 6.5 or 7 μ m, described thickness of aluminizing PETG layer (2) is 12 μ m, and the thickness of described aramid layer (1) is 15 or 25 μ m.

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