Integrally-formed step-shaped vacuum insulated panel and manufacturing method thereof

Abstract

The invention relates to the technical field of heat insulation plate production, in particular to an integrally-formed step-shaped vacuum heat insulation plate and a manufacturing method thereof.The integrally-formed step-shaped vacuum heat insulation plate comprises a plate body, a heat insulation assembly is arranged outside the plate body, and the heat insulation assembly is used for conducting heat insulation on the inner plate body; the plate body comprises core materials, non-woven fabrics are arranged outside the core materials, and a barrier film is arranged outside the non-woven fabrics. According to the manufacturing method, the three core materials with the same length, width and thickness are spliced and stacked and are fixed through a limiting mechanism; and the problems of defects and limitation on the thickness of a single sheet produced by a conventional gas silicon product can be effectively solved. The problems of limited thickness, high shrinkage rate, high reject ratio and the like of conventional single-sheet production are easily caused, while thicker core materials can be produced and the product quality can be ensured. And meanwhile, heat loss caused by a conventional single heat insulation plate pasting mode is avoided, and the heat preservation effect is effectively improved through the integrally-formed structure due to the fact that the pasting position is prone to becoming a heat dissipation channel.

Description

Technical Field

[0001] The present invention relates to the technical field of heat insulation board production, and in particular to an integrally formed stepped vacuum heat insulation board and a manufacturing method thereof. Background Art

[0002] In modern industry and daily life, the demand for thermal insulation materials is growing, especially in terms of energy conservation, temperature control and environmental protection, efficient thermal insulation technology is particularly important. As a high-performance thermal insulation material, vacuum insulation panels have broad application prospects in many fields.

[0003] In terms of the structure of the insulation board, conventional products often have structural instability problems. The core material plays a key role in insulation in the insulation board, but the existing fixing method may not be stable enough. In terms of the assembly and connection methods of the insulation board, there is a lack of design that is easy to install and disassemble while ensuring structural stability, making it difficult to maintain and replace internal components. Once a local problem occurs, the entire insulation board may need to be replaced, increasing the cost of use and waste of resources. Conventional gas silicon products face thickness limitations when producing single-piece insulation boards. Generally speaking, the thickness that can be produced with a single core material is usually limited to about 60mm. When thicker insulation boards are needed to meet specific insulation needs, such as large cold storage, deep-sea insulation pipelines, etc., traditional production methods are difficult to achieve. Moreover, as the thickness of the single core material increases, a series of quality problems will arise, such as large shrinkage, resulting in unstable dimensions of the insulation board; poor surface flatness, affecting the splicing and overall installation effect between the insulation boards; high product defect rate, increasing production costs and production difficulties. These problems seriously restrict the application of conventional gas silicon products in fields that require ultra-thick insulation boards. In order to achieve the required insulation thickness, the traditional method of pasting single insulation boards together is often used. However, this pasting method has obvious disadvantages. The pasting point is easy to become a channel for heat dissipation. Even if insulation materials are used, heat will still leak through the pasting gap, which greatly reduces the overall insulation effect. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention adopts the following technical solution to solve the technical problems: an integrally formed stepped vacuum insulation panel, comprising: a panel body, an insulation component is arranged on the outside of the panel body, and the insulation component is used to insulate and heat-preserve the internal panel body; the panel body comprises a core material, a non-woven fabric is arranged on the outside of the core material, a barrier film is arranged on the outside of the non-woven fabric, the non-woven fabric wraps the core material, and the superimposed core material after wrapping the non-woven fabric is located inside the barrier film; the insulation component comprises a top frame, the top end of the top frame is fixedly connected to an upper insulation board, the bottom end of the top frame is provided with a bottom frame, the bottom end of the bottom frame is fixedly connected to a lower insulation board, the inner wall of the upper insulation board is symmetrically slidably connected to a sliding rod, the outer wall of the bottom end of the sliding rod is fixedly connected to a limiting ring, the outer wall of the bottom frame is symmetrically fixedly connected to a clamping ring, and the inner wall of the top frame is slidably connected to an insulation frame.

[0005] The present invention is further configured such that a threaded groove is provided at the bottom end of the sliding rod, the outer wall of the sliding rod is slidably connected to the inner wall of the insulation frame, the outer wall of the limiting ring is slidably connected to the outer wall of the insulation frame, the outer wall of the bottom end of the sliding rod is threadedly connected to the inner wall of the clamping ring, and the inner walls of the upper insulation plate and the lower insulation plate are in contact with the outer wall of the plate body.

[0006] The present invention is further configured such that the barrier film, non-woven fabric and core material are stacked in order from outside to inside, the core material is made of silicon dioxide, the core material is formed by stacking three pieces of the same length, width and thickness, the non-woven fabric is made of polypropylene fiber, and the barrier film, non-woven fabric and core material are bonded together by an adhesive. There are three ways to stack the core material, namely, stacking core materials of the same length, width and thickness; stacking core materials of the same length, width and different thickness; stacking core materials of different lengths, widths and the same thickness; stacking core materials of different lengths, widths and different thicknesses, and the edges of the spliced ​​and stacked core materials remain flush.

[0007] The present invention is further configured such that the barrier film comprises a thin film layer, a dense coating is arranged on the outside of the thin film layer, a barrier layer is arranged on the outside of the dense coating, and the thin film layer, the dense coating and the barrier layer are stacked in order from outside to inside.

[0008] The present invention is further configured such that the material of the film layer is polyethylene, the material of the dense coating is silicon dioxide, and the material of the barrier layer is aluminum foil.

[0009] The present invention is further configured such that the core material wall has slots symmetrically provided at upper and lower ends, the inner wall of the slot is provided with fixing holes, and the inner wall of the slot is slidably connected to a limiting mechanism.

[0010] The present invention is further configured such that the limiting mechanism includes a card shell, the inner wall of the card shell is slidably connected to a moving rod, the inner wall of the card shell is rotatably connected to an adjusting screw, the outer wall of the moving rod is fixedly connected to a bevel block, the inner wall of the card shell is slidably connected to an insertion rod, the bottom outer wall of the insertion rod is fixedly connected to a reset spring, and the top outer wall of the insertion rod is fixedly connected to a stop ring.

[0011] The present invention is further configured such that the outer wall of the housing is slidably connected to the inner wall of the slot, the outer wall of the adjusting screw is threadedly connected to the inner wall of the moving rod, the bottom end of the insertion rod is slidably connected to the outer wall of the inclined block, the top end of the reset spring is fixedly connected to the inner wall of the housing, and the outer wall of the insertion rod is slidably connected to the inner wall of the fixing hole.

[0012] A method for manufacturing an integrally formed stepped vacuum insulation panel comprises the following steps: Step 1: splice and stack three core materials of the same length, width and thickness, and use a limiting mechanism to fix and lock the core materials in pairs, so that the edges of the spliced ​​and stacked core materials remain flush; Step 2: Wrap the core material with non-woven fabric. You can choose to wrap each piece with non-woven fabric before stacking or wrap the whole piece with non-woven fabric after stacking; Step 3: Place the superimposed core material wrapped with the non-woven fabric in step 2 into the barrier film; Step 4: Vacuum the product wrapped with the barrier film in step 3 to obtain an integrally formed stepped vacuum insulation panel.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention sets a plate body, and the core material is made of silica, which has good thermal insulation performance and is the basis for achieving thermal insulation. The external barrier film structure is carefully designed, and the aluminum foil of the barrier layer can reflect thermal radiation and effectively block the entry and exit of heat. The dense coating further enhances the barrier effect and reduces the transfer of heat by conduction. The film layer provides basic protection and sealing basis to ensure the stability of the internal thermal insulation environment. In addition, the upper insulation board, lower insulation board and insulation frame in the thermal insulation assembly work together to reduce the heat exchange between the plate body and the external environment from multiple directions, greatly improving the overall thermal insulation effect, and is suitable for scenes with high thermal insulation requirements.

[0014] 2. The present invention achieves fixed locking by setting a unique limiting mechanism. During the stacking process, the card slot in the core material wall and the limiting mechanism in the card slot are utilized. Its working principle ensures a stable connection between adjacent core materials, so that the edges of the core materials after splicing and stacking remain flush, ensuring the stability and integrity of the board structure, and preventing the thermal insulation performance from being affected by the movement or deformation of the core materials during use. At the same time, the top frame and the bottom frame in the thermal insulation assembly are connected through the cooperation of the slide rod and the clamping ring, as well as the sliding connection between the slide rod and the insulation frame and the limiting effect of the limiting ring, which not only achieves a tight wrapping and fixation of the board body, ensuring the stability of the entire insulation board structure, but also facilitates installation and disassembly, is conducive to the maintenance and replacement of internal board parts, and extends the service life of the product.

[0015] 3. The present invention adopts a manufacturing method that uses three pieces of core materials with the same length, width and thickness to be spliced ​​and stacked and fixed with a limiting mechanism, which can effectively solve the defects and limitations of the thickness of single pieces in the production of conventional gas silicon products. The thickness of conventional single-piece production is limited, and it is prone to problems such as large shrinkage, poor surface flatness, and high defective rate. The present invention can produce thicker core materials and ensure product quality, thereby improving the product qualification rate. At the same time, the heat loss caused by the conventional use of single-piece insulation board pasting method is avoided, because the pasting point is prone to become a heat dissipation channel, and the one-piece molding structure of the present invention effectively prolongs the thermal insulation effect. In addition, the manufacturing method improves production efficiency and reduces costs. It has significant economic advantages in large-scale production and application, which is conducive to the promotion and application of products.

[0016] 4. The present invention provides a method of wrapping the core material with non-woven fabric, which can wrap each piece before stacking or wrap the whole after stacking, which can ensure the tightness of the fit between the core material and the external barrier film, and further assist in heat insulation and protection of the core material. The barrier film, non-woven fabric and core material are bonded together by an adhesive to ensure the connection strength between the layers and the integrity of the overall structure. The material selection and process design of the entire product cooperate with each other. From the fixation and wrapping of the core material to the final vacuum treatment, each step lays the foundation for achieving efficient thermal insulation, stable structure and good production performance, so that the product achieves an optimized balance in terms of performance, quality and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention; Figure 2 It is a schematic diagram of the structure of the heat insulation assembly of the present invention; Figure 3 It is a structural schematic diagram of the plate body of the present invention; Figure 4 is a schematic structural diagram of the barrier film of the present invention; Figure 5 It is a schematic diagram of the structure of the core material of the present invention; Figure 6 It is a structural schematic diagram of the limiting mechanism of the present invention; Figure 7 The present invention Figure 6 Enlarged view of the A structure.

[0018] In the figure: 1. insulation assembly; 11. upper insulation board; 12. sliding rod; 13. limiting ring; 14. insulation frame; 15. bottom frame; 16. snap ring; 17. lower insulation board; 18. top frame; 2. board body; 21. core material; 22. barrier film; 221. barrier layer; 222. dense coating; 223. film layer; 23. non-woven fabric; 24. slot; 25. limiting mechanism; 251. jam shell; 252. moving rod; 253. adjusting screw; 254. inclined block; 255. plug rod; 256. stop ring; 257. reset spring; 26. fixing hole. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses. Example

[0020] See also Figure 1 - Figure 7 The present invention provides a technical solution: an integrally formed stepped vacuum insulation panel, comprising: a panel body 2, a heat insulation component 1 is arranged on the outside of the panel body 2, and the heat insulation component 1 is used to insulate the internal panel body 2; the panel body 2 comprises a core material 21, a non-woven fabric 23 is arranged on the outside of the core material 21, a barrier film 22 is arranged on the outside of the non-woven fabric 23, the non-woven fabric 23 wraps the core material 21, and the superimposed core material 21 wrapped with the non-woven fabric 23 is located inside the barrier film 22; the heat insulation component 1 comprises a top frame 18, an upper insulation board 11 is fixedly connected to the top of the top frame 18, a bottom frame 15 is arranged on the bottom end of the top frame 18, a lower insulation board 17 is fixedly connected to the bottom end of the bottom frame 15, a sliding rod 12 is symmetrically slidably connected to the inner wall of the upper insulation board 11, a limiting ring 13 is fixedly connected to the outer wall of the bottom end of the sliding rod 12, a clamping ring 16 is symmetrically fixedly connected to the outer wall of the bottom frame 15, and an insulation frame 14 is slidably connected to the inner wall of the top frame 18.

[0021] A threaded groove is provided at the bottom end of the slide rod 12, the outer wall of the slide rod 12 is slidably connected to the inner wall of the insulation frame 14, the outer wall of the limit ring 13 is slidably connected to the outer wall of the insulation frame 14, the outer wall of the bottom end of the slide rod 12 is threadedly connected to the inner wall of the clamping ring 16, and the inner walls of the upper insulation board 11 and the lower insulation board 17 are in contact with the outer wall of the plate body 2.

[0022] The barrier film 22, non-woven fabric 23 and core material 21 are stacked in order from outside to inside. The core material 21 is made of silicon dioxide. The core material 21 is composed of three pieces of the same length, width and thickness. The non-woven fabric 23 is made of polypropylene fiber. The barrier film 22, non-woven fabric 23 and core material 21 are bonded together by an adhesive.

[0023] The barrier film 22 includes a thin film layer 223 , a dense coating 222 is disposed outside the thin film layer 223 , and a barrier layer 221 is disposed outside the dense coating 222 . The thin film layer 223 , the dense coating 222 , and the barrier layer 221 are stacked in order from outside to inside.

[0024] The material of the film layer 223 is polyethylene, the material of the dense coating layer 222 is silicon dioxide, and the material of the barrier layer 221 is aluminum foil.

[0025] The core material 21 has a wall with slots 24 symmetrically formed at the upper and lower ends. The inner wall of the slot 24 has a fixing hole 26 formed therein. The inner wall of the slot 24 is slidably connected to a limiting mechanism 25 .

[0026] The limiting mechanism 25 includes a casing 251, the inner wall of which is slidably connected to a moving rod 252, the inner wall of which is rotatably connected to an adjusting screw 253, the outer wall of which is fixedly connected to a bevel block 254, the inner wall of which is slidably connected to an insert rod 255, the outer wall of the bottom end of the insert rod 255 is fixedly connected to a return spring 257, and the outer wall of the top end of the insert rod 255 is fixedly connected to a stop ring 256.

[0027] The outer wall of the housing 251 is slidably connected to the inner wall of the slot 24, the outer wall of the adjusting screw 253 is threadedly connected to the inner wall of the moving rod 252, the bottom end of the insertion rod 255 is slidably connected to the outer wall of the inclined block 254, the top end of the return spring 257 is fixedly connected to the inner wall of the housing 251, and the outer wall of the insertion rod 255 is slidably connected to the inner wall of the fixing hole 26.

[0028] A method for manufacturing an integrally formed stepped vacuum insulation panel comprises the following steps: Step 1: splice and stack three core materials 21 of the same length, width and thickness, and use the limiting mechanism 25 to fix and lock the core materials 21 in pairs, so that the edges of the spliced ​​and stacked core materials 21 remain flush; Step 2: Wrap the core material 21 with the non-woven fabric 23. You can choose to wrap each piece with the non-woven fabric 23 before stacking or wrap the entire piece with the non-woven fabric 23 after stacking; Step 3: Place the superimposed core material 21 wrapped with the non-woven fabric 23 in step 2 into the barrier film 22; Step 4: vacuum the product wrapped with the barrier film 22 in step 3 to obtain an integrally formed stepped vacuum insulation panel.

[0029] Working principle: The one-piece stepped vacuum insulation panel mainly realizes the heat insulation function through the board body 2 and the insulation component 1 outside it. The core material 21 in the board body 2 is made of silica and has good heat insulation performance. The outside is wrapped with non-woven fabric 23 and barrier film 22 in sequence. The barrier film 22 includes a barrier layer 221 made of aluminum foil, a dense coating 222 made of silica and a film layer 223 made of polyethylene from the outside to the inside. This structure effectively prevents heat transfer. The aluminum foil of the barrier layer 221 can reflect thermal radiation, the dense coating 222 further enhances the barrier effect, and the film layer 223 provides basic protection and sealing basis. At the same time, the upper insulation board 11, the lower insulation board 17 and the insulation frame 14 in the insulation component 1 work together to reduce the heat exchange between the board body 2 and the external environment. The upper insulation board 11 and the lower insulation board 17 are in close contact with the outer wall of the board body 2, and the insulation frame 14 slides between the top frame 18 and the bottom frame 15 to further enhance the overall heat insulation effect. When in use, in the board body 2 structure, the non-woven fabric 23 wraps the core material 21 and is placed inside the barrier film 22 , and the barrier film 22 , the non-woven fabric 23 and the core material 21 are tightly combined by an adhesive. The core material 21 is formed by stacking three pieces of the same length, width and thickness. During the stacking process, the core material 21 is fixedly locked with each other through the slots 24 symmetrically opened at the upper and lower ends of the core material 21 wall and the limiting mechanism 25 in the slots 24. The working principle of the limiting mechanism 25 is as follows: the card shell 251 slides in the slot 24. When the adjusting screw 253 rotates, the moving rod 252 is pushed to move in the card shell 251 due to the threaded connection with the moving rod 252. The inclined block 254 on the moving rod 252 moves accordingly. The inclined block 254 pushes the insertion rod 255 to overcome the elastic force of the reset spring 257 and move upward, so that the outer wall of the insertion rod 255 slides with the inner wall of the fixing hole 26, thereby achieving the fixation between the core materials 21 and ensuring that the edges of the core materials 21 after splicing and stacking remain flush. In the heat insulation assembly 1, the top frame 18 and the bottom frame 15 are connected by the cooperation of the slide bar 12 and the clamping ring 16. The top end of the slide bar 12 is fixed to the inner wall of the upper insulation board 11, and the outer wall of the bottom end is threadedly connected to the inner wall of the clamping ring 16, and the outer wall of the slide bar 12 is slidably connected to the inner wall of the insulation frame 14, and the outer wall of the limit ring 13 is slidably connected to the outer wall of the insulation frame 14. By rotating the slide bar 12, the distance between the top frame 18 and the bottom frame 15 can be adjusted, thereby changing the position of the insulation frame 14, achieving tight wrapping and fixation of the board body 2, ensuring the stability of the entire insulation board structure, and facilitating installation and disassembly, which is conducive to maintenance and replacement of internal board body 2 components; During production, firstly, three core materials 21 of the same length, width and thickness are spliced ​​and stacked, and the limiting mechanism 25 is used to complete the fixed locking to ensure the structural stability of the core materials 21 after splicing and stacking. Then, according to the actual situation, it is selected to wrap each piece with non-woven fabric 23 before stacking or to wrap the entire non-woven fabric 23 after stacking, so that the non-woven fabric 23 tightly wraps the core material 21. Then, the stacked core material 21 wrapped with the non-woven fabric 23 is put into the barrier film 22 to ensure that the layers fit tightly. Finally, the product wrapped with the barrier film 22 is vacuumed to extract the internal air to form a vacuum environment, further reduce heat conduction, and obtain an integrally formed stepped vacuum insulation panel. This production method can effectively solve the defects and limitations of the single-piece thickness of conventional gas silicon products, improve the product qualification rate, and at the same time avoid the heat loss caused by the conventional use of single-piece insulation board pasting method, prolong the insulation effect, improve production efficiency and reduce costs.

[0030] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. An integrally formed stepped vacuum insulation panel, characterized in that: include: A plate body (2), wherein a heat insulation component (1) is arranged outside the plate body (2), and the heat insulation component (1) is used to insulate the plate body (2) inside; The plate body (2) comprises a core material (21), a non-woven fabric (23) is arranged outside the core material (21), a barrier film (22) is arranged outside the non-woven fabric (23), the non-woven fabric (23) wraps the core material (21), and the superimposed core material (21) wrapped with the non-woven fabric (23) is located inside the barrier film (22); The heat insulation assembly (1) comprises a top frame (18), the top end of the top frame (18) is fixedly connected to an upper insulation board (11), the bottom end of the top frame (18) is provided with a bottom frame (15), the bottom end of the bottom frame (15) is fixedly connected to a lower insulation board (17), the inner wall of the upper insulation board (11) is symmetrically slidably connected to a slide rod (12), the outer wall of the bottom end of the slide rod (12) is fixedly connected to a limit ring (13), the outer wall of the bottom frame (15) is symmetrically fixedly connected to a clamping ring (16), and the inner wall of the top frame (18) is slidably connected to the insulation frame (14).

2. The one-piece stepped vacuum insulation panel according to claim 1, characterized in that: A threaded groove is formed at the bottom end of the slide rod (12); the outer wall of the slide rod (12) is slidably connected to the inner wall of the insulation frame (14); the outer wall of the limit ring (13) is slidably connected to the outer wall of the insulation frame (14); the outer wall of the bottom end of the slide rod (12) is threadedly connected to the inner wall of the clamping ring (16); and the inner walls of the upper insulation plate (11) and the lower insulation plate (17) are in contact with the outer wall of the plate body (2).

3. The one-piece stepped vacuum insulation panel according to claim 1, characterized in that: The barrier film (22), the non-woven fabric (23) and the core material (21) are stacked in order from the outside to the inside; the core material (21) is made of silicon dioxide; the core material (21) is formed by stacking three pieces of the same length, width and thickness; the non-woven fabric (23) is made of polypropylene fiber; the barrier film (22), the non-woven fabric (23) and the core material (21) are bonded together by an adhesive.

4. The integrally formed stepped vacuum insulation panel according to claim 2, characterized in that: The barrier film (22) comprises a thin film layer (223), a dense coating (222) is arranged outside the thin film layer (223), and a barrier layer (221) is arranged outside the dense coating (222), and the thin film layer (223), the dense coating (222) and the barrier layer (221) are stacked in order from outside to inside.

5. The integrally formed stepped vacuum insulation panel according to claim 4, characterized in that: The material of the film layer (223) is polyethylene, the material of the dense coating (222) is silicon dioxide, and the material of the barrier layer (221) is aluminum foil.

6. The integrally formed stepped vacuum insulation panel according to claim 3, characterized in that: The core material (21) has a wall with slots (24) symmetrically formed at the upper and lower ends, an inner wall of the slot (24) is provided with a fixing hole (26), and the inner wall of the slot (24) is slidably connected to a limiting mechanism (25).

7. The integrally formed stepped vacuum insulation panel according to claim 6, characterized in that: The limiting mechanism (25) comprises a casing (251), the inner wall of which is slidably connected to a moving rod (252), the inner wall of which is rotatably connected to an adjusting screw (253), the outer wall of which is fixedly connected to an inclined block (254), the inner wall of which is slidably connected to an insert rod (255), the outer wall of the bottom end of which is fixedly connected to a return spring (257), and the outer wall of the top end of which is fixedly connected to a stop ring (256).

8. The integrally formed stepped vacuum insulation panel according to claim 7, characterized in that: The outer wall of the housing (251) is slidably connected to the inner wall of the slot (24), the outer wall of the adjusting screw (253) is threadedly connected to the inner wall of the moving rod (252), the bottom end of the insertion rod (255) is slidably connected to the outer wall of the inclined block (254), the top end of the return spring (257) is fixedly connected to the inner wall of the housing (251), and the outer wall of the insertion rod (255) is slidably connected to the inner wall of the fixing hole (26).

9. A method for manufacturing an integrally formed step-shaped vacuum insulation panel, used for manufacturing the integrally formed step-shaped vacuum insulation panel according to claims 1 to 8, characterized in that: The following steps are involved: Step 1: splice and stack three core materials of the same length, width and thickness, and use a limiting mechanism (25) to fix and lock the core materials (21) in pairs, so that the edges of the spliced ​​and stacked core materials (21) remain flush; Step 2: Wrap the core material (21) with a non-woven fabric (23), and each piece can be wrapped with the non-woven fabric (23) before stacking, or the entire piece can be wrapped with the non-woven fabric (23) after stacking; Step 3: placing the stacked core material (21) wrapped with the non-woven fabric (23) in step 2 into the barrier film (22); Step 4: vacuum the product wrapped with the barrier film (22) in step 3 to obtain an integrally formed stepped vacuum insulation panel.

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