Heat preservation sleeve capable of resisting high temperature of 1000 DEG C and preparation method of heat preservation sleeve

Abstract

The invention relates to a 1000 DEG C high-temperature resistant thermal insulation sleeve and a preparation method thereof. The heat preservation sleeve resistant to the high temperature of 1000 DEG C is cylindrical or sheet-shaped; comprising an inner layer, a middle layer and an outer layer, the inner layer and the outer layer are made of polyurethane-coated high-silica glass fiber cloth, and the middle layer is made of Teflon-coated high-silica glass fiber medium-thickness cloth or polyurethane-coated high-silica glass fiber cloth. According to the invention, the heat conductivity coefficient of the high silica cloth is 0.038 W / m.K, and the heat conductivity coefficient at high temperature is increased by 15% per 500 DEG C. The content of silicon dioxide is as high as 96%-98%, and the heat conductivity coefficient of the plain and satin cloth compact fabric is remarkably reduced by reducing air gaps and increasing the contact area of fibers, and is reduced by 30%-50% compared with that of common glass cloth. In production, the roughness degree of the fiber surface is changed through an acid treatment process, the heat conductivity coefficient is further reduced by 10%-20%, and the heat preservation effect is achieved. And a product wrapped in the heat insulation sleeve is subjected to coating treatment, so that fiber residues cannot fall off, adverse effects cannot be caused in the using process, and the heat insulation sleeve is widely applied to the fields of aerospace and the like.

Description

Technical Field

[0001] This invention relates to the field of special new materials, specifically a high-temperature resistant material and a method for preparing its insulation jacket. Technical Background

[0002] Thermal insulation materials are used to reduce heat transfer. Their structure is typically porous or fibrous, mainly composed of organic polymers or inorganic minerals. They possess low thermal conductivity, good insulation performance, and a certain degree of mechanical strength. Organic insulation materials are characterized by good insulation and low production costs, but they are flammable and have a low safety factor. Inorganic insulation materials, on the other hand, have excellent fire resistance and are widely used in aerospace and other industrial fields.

[0003] In thermal insulation materials, high-silica glass fiber medium-thickness cloth, as an inorganic material, is made by producing medium-thickness cloth with a thickness >0.5mm from high-silica glass fiber yarn through a Wanli rapier loom. After acid heat treatment, it is made into high-silica glass fiber medium-thickness cloth with a silica content >96% and a temperature resistance of up to 1000℃. It has excellent temperature resistance and chemical stability. Coating its surface with organic materials gives it excellent wear resistance and sewing performance.

[0004] Teflon-coated high-silica fiberglass cloth is made by coating the surface of high-silica fiberglass cloth with polytetrafluoroethylene, which gives the high-silica fiberglass cloth good abrasion resistance and sewing performance.

[0005] A search of patents CN210978983U, CN211260754U, and CN212203626U reveals that the insulation material used in these patents is a composite of aluminosilicate ceramic fiber blankets and fiberglass coated cloth. Depending on the shape of the object being insulated, flexible insulation materials are created. Aluminosilicate composite blankets have a temperature resistance of 1200℃-1400℃, classifying them as high-temperature resistant materials, and when made into composite blankets, they can provide thermal insulation. However, aluminosilicate composite blankets are thick, dense, and relatively hard, with poor sewing performance and difficulty in processing into various shapes. For small insulation sleeves with a length <500mm, weight <150g, and thickness <5mm, the operation is difficult. Aluminosilicate ceramic fiber blankets with a thickness <5mm are costly to produce and difficult to process. Furthermore, blankets and felts are prone to fiber shedding during sewing, and when covered with fiberglass cloth during sewing, the middle layer of the aluminosilicate ceramic fiber blanket is prone to breakage when the stitch length is <1cm. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, such as stiffness of aluminosilicate ceramic fiber blankets, difficulty in handling, easy shedding during sewing, inability to make various shapes, and small thermal insulation covers with a weight of <150g, thickness of <5mm, and length of <500mm, this invention proposes a small thermal insulation cover resistant to 1000℃ and its preparation method.

[0007] The high-temperature insulation jacket proposed in this invention is cylindrical or sheet-shaped; it includes an inner layer, a middle layer and an outer layer; the inner and outer layers are both made of polyurethane-coated high-silica glass fiber cloth, and the middle layer is made of Teflon-coated high-silica glass fiber medium-thickness cloth or polyurethane-coated high-silica glass fiber cloth.

[0008] The intermediate layer consists of 2 to 4 layers. When there are 2 intermediate layers, the thicknesses of the two layers of Teflon-coated high-silica glass fiber medium-thickness cloth are 0.74 mm and 1.35 mm, respectively. When there are 3 intermediate layers, the thicknesses of the three layers of Teflon-coated high-silica glass fiber medium-thickness cloth are the same, and the total thickness of the intermediate layer is 1.26 mm. When there are 4 intermediate layers, polyurethane-coated high-silica glass fiber cloth is used, and the thickness of each layer of polyurethane-coated high-silica glass fiber cloth is 0.26 mm.

[0009] When the insulation sleeve has a base plate at one end, the base plate is made of 8 layers of polyurethane-coated high-silica fiberglass cloth, and its outer diameter is the same as the inner diameter of the insulation sleeve. The thickness of a single layer of polyurethane-coated high-silica fiberglass cloth is 0.26 mm.

[0010] The weave of the thick Teflon high-silica glass fiber cloth is satin or plain weave.

[0011] The specific process for manufacturing a high-temperature insulation jacket that can withstand 1000℃, as proposed in this invention, is as follows:

[0012] Step 1, Material preparation:

[0013] Cut the material according to the unfolded diagram of the insulation sleeve, and leave a seam allowance of 10mm to 30mm at the seam. Obtain the required blank.

[0014] When cutting materials, if the insulation sleeve is cylindrical, the inner and outer layers are made from the same piece of blank; if the insulation sleeve is sheet-shaped, it is cut according to the set number of layers. Based on the structural characteristics of the insulated part, notches or round holes are made in the exposed parts of the cut blank to meet the usage requirements.

[0015] When the insulation sleeve is sheet-shaped, a rectangular opening is machined at the geometric center of each blank, and the geometric center of the opening coincides with the geometric center of the blank. Rectangular notches of different depths are cut on the two short sides of the sheet-shaped insulation sleeve blank, making the blank H-shaped.

[0016] Step 2, sewing:

[0017] When sewing:

[0018] Ⅰ When the insulation sleeve is cylindrical, the polyurethane-coated high-silica fiberglass cloth blank, which serves as the inner and outer layers, is folded in half to form a rectangular blank. The two long sides of this rectangular blank are sewn together using quartz fiberglass sewing thread. This yields the sewn-on insulation sleeve.

[0019] When sewing, the seam should be 3cm from the fabric edge; the stitch length should be less than 1cm.

[0020] Polyurethane-coated high-silica fiberglass cloth, serving as the inner and outer layers, is folded in half. The cut middle layer is then stacked and inserted into the sewn sleeve. The opening of the sewn sleeve is sewn shut with sewing yarn to obtain a semi-finished insulation sleeve. The semi-finished sleeve is folded along its long side and sewn into a cylindrical shape to obtain a sleeve-shaped insulation sleeve resistant to 1000℃ high temperatures.

[0021] II. When the insulation sleeve is in sheet form,

[0022] Align and stack the obtained blanks. Fold the stacked blanks two layers at a time; when folding, fold the seam of the blank edge inward, and sew the edge of the blank after folding with quartz glass fiber sewing thread; the stitch length is <1cm, to obtain the blank of the high temperature insulation sleeve.

[0023] Nylon Velcro is sewn onto the surface of the outermost blank.

[0024] In use, the obtained high-temperature insulation sleeve is wrapped around the part to be insulated, and the high-temperature insulation sleeve is overlapped with nylon fasteners to achieve the purpose of wrapping and insulating the part.

[0025] The nylon fasteners are in two sets, located on the blank surface on both sides of the notch at both ends of the blank, with the female fastener in each set located at the end with the smaller notch depth and the female fastener in each set located at the end with the larger notch depth.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0027] The small / irregularly shaped insulation sleeves obtained by this invention meet the requirements of GB / T3003-2017 "Refractory Fibers and Products". In the aforementioned national standard GB / T3003-2017 "Refractory Fibers and Products", the thermal conductivity of high-silica glass fiber cloth at room temperature (25℃) ranges from 0.035 to 0.045 W / (mK). According to tests, the thermal conductivity of 1mm thick high-silica cloth is 0.038 W / (mK). The thermal conductivity increases slightly at high temperatures, increasing by 15% for every 500℃. Furthermore, the silica content is as high as 96%-98%, and the tight weave of plain and satin fabrics significantly reduces the thermal conductivity by reducing air gaps and increasing fiber contact area, with a thermal conductivity 30%-50% lower than that of ordinary glass cloth. Furthermore, the acid treatment process during its production alters the surface roughness of the fibers, further reducing the thermal conductivity by 10%-20%. The product of this invention is made from Teflon-coated high-silica glass fiber medium-thickness cloth, polyurethane-coated high-silica glass fiber cloth, and quartz glass fiber sewing thread. Under high-temperature conditions, it exhibits a very low thermal conductivity, achieving a heat insulation effect. The inner layer of the insulation jacket, due to its coating treatment, will not shed fiber residue and will not cause adverse effects during use, making it widely applicable in aerospace and other fields. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the Φ60×220 thermal insulation sleeve structure.

[0029] Figure 2 This is a schematic diagram of the cutting process for a Φ36×226 insulation jacket; among which, Figure 2 a is the material cutting diagram of the inner and outer layers of the insulation jacket. Figure 2 b is the cutting diagram of the middle layer of the insulation jacket.

[0030] Figure 3 This is a schematic diagram of the finished Φ36×226 thermal insulation jacket; among which, Figure 3 'a' is the main view. Figure 3 b is a side view. Figure 3 c is the top view.

[0031] Figure 4 This is a schematic diagram of the 115mm insulation jacket structure.

[0032] Figure 5 This is a flowchart of the present invention. Specific Implementation

[0033] Example 1

[0034] This embodiment is a sleeve-shaped heat insulation sleeve that can withstand high temperatures of 1000℃; the insulated part is a cylindrical structure with a diameter of 60mm and a length of 220mm.

[0035] The insulation jacket comprises an inner layer, a middle layer, and an outer layer. Its inner diameter is 60 mm, its thickness is 2.61 mm, the inner and outer layer thicknesses are both 0.26 mm, the middle layer thickness is 2.09 mm, and its length is 220 mm. The insulation jacket weighs 110–120 g.

[0036] Both the inner and outer layers are made of polyurethane-coated high-silica glass fiber cloth, and the middle layer is made of Teflon-coated high-silica glass fiber medium-thickness cloth; it is made of quartz glass fiber sewing thread.

[0037] The polyurethane-coated high-silica glass fiber cloth has a thickness of 0.26 mm and a plain weave structure.

[0038] The intermediate layer is composed of two layers of Teflon-coated high-silica glass fiber medium-thickness fabric with different thicknesses. The thicknesses of the two types of Teflon-coated high-silica glass fiber medium-thickness fabric are 0.74 mm and 1.35 mm, respectively. The weave of the Teflon-coated high-silica glass fiber medium-thickness fabric is satin.

[0039] The quartz glass fiber sewing thread is QC7.5~390Z150.

[0040] This embodiment also proposes a method for manufacturing an insulation sleeve with an inner diameter of 60mm, a length of 220mm, and a thickness of 2.61mm. The specific process is as follows:

[0041] Step 1, Material preparation:

[0042] The finished insulation sleeve has an unfolded shape of 220*188mm, with the blank size adjusted to accommodate seams during manufacturing. When cutting the blank, a seam width of 30mm is added to the seam width of the finished product; that is, the seam size = finished product size + seam width. The blank dimensions are as follows: the inner and outer layers are made from the same piece of material, with a blank size of 500×248mm; the two intermediate layers of different thicknesses are both 220*188mm. The blanks are then cut according to these dimensions to obtain the sleeve-shaped insulation sleeve blank.

[0043] Step 2, sewing:

[0044] The inner and outer layers are made of polyurethane-coated high-silica fiberglass cloth BWTC260, which is folded in half to form a rectangle of 250×248mm. The two long sides of the rectangle are sewn together using quartz fiberglass sewing thread. When sewing, the seam should be 3cm from the edge of the cloth; the stitch length should be <1cm.

[0045] Turn the sewn inner and outer layers inside out so that the seam remains inside the insulation sleeve. This gives you the sewn-on insulation sleeve.

[0046] After stacking the two cut middle layers, insert them into the sewing sleeve and sew the opening of the sewing sleeve with sewing yarn to obtain a semi-finished product of the thermal insulation sleeve.

[0047] The semi-finished product is folded along its long side and then sewn into a cylindrical shape. Figure 1 As shown, a sleeve-shaped heat insulation sleeve resistant to 1000℃ high temperature is obtained.

[0048] The model and temperature resistance test results of the insulation jacket obtained in Example 1 are shown in the table.

[0049] index Example 1 weight 113g thickness 2.61mm Temperature resistance 1000℃ No deformation length 220mm

[0050] As can be seen from the test results of the above embodiments, the present invention relates to a small heat insulation sleeve with an inner diameter of 60mm, a thickness of 2.61mm, an inner layer thickness and an outer layer thickness of 0.26mm, a middle layer thickness of 2.09mm, and a length of 220mm. The heat insulation sleeve made there is no deformation when placed in a muffle furnace at 1000℃, thus obtaining a heat insulation sleeve that can withstand high temperatures of 1000℃.

[0051] Example 2:

[0052] This embodiment is a cylindrical insulation jacket that can withstand high temperatures of 1000℃. The insulated part is a cylindrical structure with a diameter of 36mm and a length of 226mm.

[0053] The insulation sleeve is a cylindrical insulation sleeve with an inner diameter of 36mm, an outer diameter of 40.5mm, a thickness of 4.5mm, a length of 226mm, and a mass of 120-130g.

[0054] The insulation jacket includes an inner layer, a middle layer, an outer layer, and a bottom plate.

[0055] The intermediate layer is made of three layers of Teflon-coated high-silica glass fiber medium-thickness cloth; the inner and outer layers are both made of polyurethane-coated high-silica glass fiber cloth; and it is sewn with quartz glass fiber sewing thread.

[0056] The middle layer has a thickness of 1.26 mm and is a satin weave. The inner and outer layers have a thickness of 0.26 mm and are plain weaves.

[0057] The base plate is made of eight layers of polyurethane-coated high-silica fiberglass cloth, with its outer diameter matching the inner diameter of the insulation sleeve. The thickness of a single layer of the polyurethane-coated high-silica fiberglass cloth is 0.26 mm.

[0058] The quartz glass fiber sewing thread is QC7.5-390Z150.

[0059] This embodiment also proposes a method for manufacturing the cylindrical insulation sleeve, the specific process of which is as follows:

[0060] Step 1: Material preparation:

[0061] The unfolded diagram of the finished cylindrical insulation sleeve is a rectangle of 226*113mm. When cutting the material, the seam width is increased by 30mm at the seam of the finished product size, that is, the sewing size = finished product size + seam width.

[0062] The inner and outer layers are made from the same piece of material, with a blank size of 512×173mm; the middle layer has a blank size of 226*113mm, and three pieces are cut. The blanks are cut according to these dimensions to obtain the tubular insulation jacket blank.

[0063] Two rectangular U-shaped notches are cut along one short side of the cut intermediate layer blank, symmetrically positioned to the center line of the blank's width and corresponding to the required exposed areas on the insulated component. Each notch is 14mm wide and 15mm deep. Figure 2 As shown.

[0064] Eight cylindrical insulation jacket base plates were cut from polyurethane-coated high-silica fiberglass cloth. The outer diameter of each base plate blank was the same as the inner diameter of the insulation jacket, which was 36mm. A concentric circle with a diameter of 25mm was cut at the center of each base plate blank to meet the requirements of the exposed bottom end face of the insulated component.

[0065] Step 2: Sewing:

[0066] The polyurethane-coated high-silica glass fiber cloth BWTC260 blank for the inner and outer layers is folded along its length to form a rectangle of 256×173mm.

[0067] The two long sides of the rectangle are sewn together using quartz glass fiber sewing thread. When sewing, the seam should be 3cm from the fabric edge; the stitch length should be less than 1cm.

[0068] Turn the sewn inner and outer layers inside out so that the seam remains inside the insulation sleeve. This gives you the sewn-on insulation sleeve.

[0069] After stacking the three cut middle layer blanks, insert them into the sewing sleeve, and sew the opening of the sewing sleeve with sewing yarn to obtain a semi-finished tubular insulation sleeve.

[0070] The semi-finished tubular insulation sleeve is folded along its long side and then sewn into a tubular shape.

[0071] The cut base plates are stacked to obtain the base plate. The edge of the base plate is sewn to the inner circumference of one end of the obtained cylindrical insulation sleeve semi-finished product to obtain the cylindrical insulation sleeve, as shown. Figure 3 As shown.

[0072] The model and temperature resistance test results of the insulation jacket produced in Example 2 are shown in the table.

[0073] index Example 1 weight 122g thickness 4.5mm Temperature resistance 1000℃ No deformation length 226mm

[0074] As can be seen from the test results of the above embodiments, the present invention relates to a cylindrical insulation sleeve with an inner diameter of 36mm, a thickness of 4.5mm, a length of 226mm, and a mass of 122g. The insulation sleeve was placed in a muffle furnace at 1000℃ without deformation, and it belongs to the category of insulation sleeves that can withstand high temperatures of 1000℃.

[0075] Example 3

[0076] This embodiment is a high-temperature insulation jacket resistant to 1000℃, and the insulated part is cylindrical.

[0077] The high-temperature insulation sleeve is a sheet-shaped insulation sleeve with a length of 115mm and a weight of 110g, made of four layers of polyurethane-coated high-silica fiberglass cloth. It is sewn with quartz fiberglass sewing thread.

[0078] The polyurethane-coated high-silica glass fiber cloth has a thickness of 0.26 mm and a plain weave structure.

[0079] The quartz glass fiber sewing thread is QC7.5-390Z150.

[0080] This embodiment also proposes a method for manufacturing the high-temperature insulation jacket, the specific process of which is as follows:

[0081] Step 1: Material preparation:

[0082] The unfolded plan view of the insulated component is a rectangle of 115mm*250mm, with openings in the exposed portion.

[0083] The polyurethane-coated high-silica fiberglass cloth BWTC260-82 is cut to size according to the dimensions, that is, the cut size is 10mm larger than the finished insulation sleeve structure size for seam allowance.

[0084] During the blanking process, four rectangular blanks measuring 270*135mm are cut from polyurethane-coated high-silica fiberglass cloth. A rectangular opening with a length of 55mm and a width of 20mm is machined at the geometric center of each blank; the geometric center of the opening coincides with the geometric center of the blank.

[0085] Rectangular notches are cut on the two short sides of each blank to make the blank into an H shape; the two ends of the notch have different dimensions, with one end having a length of 50mm and a depth of 65mm, and the other end having a length of 50mm and a depth of 85mm.

[0086] Step 2: Sewing:

[0087] Align and stack the four layers of blanks. Fold the stacked blanks two layers at a time; when folding, fold the seam of the blank edge inward, and sew the folded blank edge with quartz glass fiber sewing thread; the stitch length is <1cm to obtain the blank of the high temperature insulation sleeve.

[0088] Nylon fasteners are sewn onto the surface of the outermost layer of the blank. Two sets of fasteners are located on the surface of the blank on either side of the notches at both ends, with the female fastener in each set positioned at the end with the shallower notch depth, and the female fastener in each set positioned at the end with the deeper notch depth. This results in a high-temperature insulation sleeve as follows: Figure 4 .

[0089] In use, the obtained high-temperature insulation sleeve is wrapped around the part to be insulated, and the high-temperature insulation sleeve is overlapped with nylon fasteners to achieve the purpose of wrapping and insulating the part.

[0090] The model and temperature resistance test results of the insulation jacket produced in Example 3 are shown in the table.

[0091] index Example 1 weight 110g Temperature resistance 1000℃ No deformation length 220mm

[0092] As can be seen from the test results of the above embodiments, the present invention relates to a cylindrical insulation sleeve with a length of 115mm and a weight of 110g. The sleeve is made of four layers of polyurethane coated high-silica glass fiber cloth. The insulation sleeve was placed in a muffle furnace at 1000℃ without deformation, thus obtaining an insulation sleeve that can withstand a high temperature of 1000℃.

Claims

1. A high-temperature insulation jacket resistant to 1000℃, characterized in that, The insulation jacket is cylindrical or sheet-shaped; it includes an inner layer, a middle layer and an outer layer; the inner and outer layers are both made of polyurethane-coated high-silica glass fiber cloth, and the middle layer is made of Teflon-coated high-silica glass fiber medium-thickness cloth or polyurethane-coated high-silica glass fiber cloth. The intermediate layer consists of 2 to 4 layers. When the intermediate layer consists of 2 layers, the thicknesses of the 2 layers of Teflon-coated high-silica glass fiber medium-thickness cloth are 0.74 mm and 1.35 mm, respectively. When the intermediate layer consists of 3 layers, the thicknesses of the 3 layers of Teflon-coated high-silica glass fiber medium-thickness cloth are the same, all being 1.26 mm. When the intermediate layer consists of 4 layers, polyurethane-coated high-silica glass fiber cloth is used, and the thickness of each layer of polyurethane-coated high-silica glass fiber cloth is 0.26 mm.

2. The high-temperature insulation sleeve resistant to 1000℃ as described in claim 1, characterized in that, When one end of the insulation sleeve has a base plate, the base plate is made of 8 layers of polyurethane-coated high-silica fiberglass cloth, and its outer diameter is the same as the inner diameter of the insulation sleeve; the thickness of a single layer of polyurethane-coated high-silica fiberglass cloth is 0.26 mm.

3. The high-temperature insulation sleeve resistant to 1000℃ as described in claim 1, characterized in that, The thickness of the Teflon-coated high-silica glass fiber cloth is 0.3mm-1.26mm, the weave is satin plain weave, and the unit area mass is 300-1250g / ㎡.

4. A method for manufacturing the high-temperature insulation sleeve withstanding 1000℃ as claimed in claim 1, characterized in that, The specific process is as follows: Step 1, Material preparation: Cut the material according to the unfolded diagram of the insulation sleeve, and leave a seam allowance of 10mm to 30mm at the seam; to obtain the required blank material; Step 2, sewing: When sewing: Ⅰ When the insulation sleeve is cylindrical, the polyurethane-coated high-silica glass fiber cloth blank, which serves as the inner and outer layers, is folded into a rectangular blank; the two long sides of the rectangular blank are sewn together using quartz glass fiber sewing thread. Obtain the sewn cover for the insulation sleeve; When sewing, the seam should be 3cm from the fabric edge; the stitch length should be less than 1cm. The polyurethane-coated high-silica fiberglass cloth, which serves as the inner and outer layers, is folded in half. The cut middle layer is stacked and inserted into the sewing sleeve. The opening of the sewing sleeve is sewn with sewing yarn to obtain a semi-finished product of the thermal insulation sleeve. The semi-finished product is folded along its long side and sewn into a cylindrical shape to obtain a sleeve-shaped heat insulation sleeve that can withstand high temperatures of 1000℃. II. When the insulation sleeve is in sheet form, Align and stack the obtained blanks; fold the stacked blanks two layers at a time; when folding, fold the seam of the blank edge inward, and sew the edge of the blank after folding with quartz glass fiber sewing thread; the stitch length is <1cm to obtain the blank of the high temperature insulation sleeve. Sew Velcro fasteners onto the surface of the outermost blank; In use, the obtained high-temperature insulation sleeve is wrapped around the part to be insulated, and the high-temperature insulation sleeve is overlapped with nylon fasteners to achieve the purpose of wrapping and insulating the part.

5. The method for manufacturing the 1000℃ high-temperature insulation jacket as described in claim 1, characterized in that, When cutting materials, if the insulation sleeve is cylindrical, the inner and outer layers of the insulation sleeve are made from the same blank; if the insulation sleeve is sheet-shaped, the materials are cut layer by layer according to the set number of layers.

6. The method for manufacturing the 1000℃ high-temperature insulation jacket as described in claim 1, characterized in that, When cutting materials, according to the structural characteristics of the insulated parts, notches or round holes are made in the exposed parts of the cut blank to meet the usage requirements.

7. The method for manufacturing the 1000℃ high-temperature insulation jacket as described in claim 1, characterized in that, When the insulation sleeve is sheet-shaped, a rectangular opening is machined at the geometric center of each blank, and the geometric center of the opening coincides with the geometric center of the blank. Rectangular notches of different depths are cut into the two short sides of the sheet-like insulation jacket blank to make the blank into an H shape.

8. The method for manufacturing the 1000℃ high-temperature insulation jacket as described in claim 1, characterized in that, The nylon fasteners are in two sets, located on the blank surface on both sides of the notch at both ends of the blank, with the female fastener in each set located at the end with the smaller notch depth and the female fastener in each set located at the end with the larger notch depth.

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