Apparatus and method for preparing metal sewing thread for sewing machines, sewing thread and special sewing machine

Abstract

This invention relates to a device, method, thread, and dedicated sewing machine for preparing metal sewing thread. A pure metal sewing thread, formed by twisting and annealing seven ultra-fine stainless steel monofilaments, is designed. This sewing thread is used in a dedicated sewing machine, enabling machine sewing. The metal sewing thread preparation device includes a complete sewing thread production system, effectively reducing thread breakage during production. The annealing process also improves the thread's flexibility. A proprietary metal sewing thread guide device is designed for the sewing machine, allowing it to coordinate with the up-and-down movement of the sewing machine, achieving automated sewing of the metal thread. This design not only optimizes the flexibility and strength of the metal sewing thread but also enables automated sewing of pure metal sewing thread on a sewing machine.

Description

Technical Field

[0001] This invention relates to high-temperature resistant heat-insulating sewing thread, and more particularly to an apparatus, method, sewing thread, and a dedicated sewing machine for preparing metal sewing thread for sewing machines. Background Technology

[0002] Multilayer thermal insulation materials are the outer thermal protection materials for specialized precision instruments and aerospace devices. They are typically composed of multiple layers, including metal films, high-temperature resistant fabrics, and mesh materials, and require metal thread for interlocking between the layers. Currently, this can only be done manually using monofilament metal threads because monofilament metal threads are rigid, not flexible enough, and prone to plastic deformation, making machine stitching difficult and hindering automated sewing. Specifically, because ordinary metal threads are not flexible enough, they undergo plastic deformation during the movement of the sewing needle. This causes the upper metal thread to fail to connect with the lower metal thread, resulting in the connection structure shown in the red box in the image above, leading to stitch failure or skipped stitches. Manual sewing suffers from low precision, poor consistency, poor stability, and low efficiency. Furthermore, if a monofilament metal thread breaks, the entire stitch will be pulled out, causing the entire sewing to fail, posing a high risk.

[0003] For multi-layered metal sewing threads, patent CN 203451722 U discloses a conductive sewing thread made of twisted metal fibers and polyester fibers. However, this thread contains polyester organic fibers, which are difficult to withstand temperatures above 700°C. Patent CN 118127718 A discloses an automated washing label production equipment and method, mentioning a method of embedding metal fiber sewing threads using organic sewing thread. This method actually uses ordinary sewing thread to bind the metal fibers, and does not truly achieve multi-layered sewing of the metal thread. Furthermore, it is not heat-resistant; under high-temperature conditions, the organic fibers carbonize, creating thermally conductive gaps at the needle holes. Therefore, the problem of automated sewing of stainless steel metal threads for multi-layered thermal insulation materials remains. Summary of the Invention

[0004] The purpose of this invention is to overcome the technical bottleneck in the prior art that multi-layer thermal insulation materials cannot be machine-sewn with metal sewing thread, and to provide a sewing machine preparation device, method, sewing thread and special sewing machine for automatically sewing multi-layer thermal insulation materials.

[0005] To achieve the above objectives, the technical solution of the present invention is:

[0006] In a first aspect, the present invention provides a high-temperature resistant, ultra-fine metal sewing thread for sewing machines, wherein the metal sewing thread is composed of six outer metal wires twisted together with a core metal wire; the core metal wire has the same diameter as the outer metal wires, and the diameter of the metal sewing thread for sewing machines is 0.12 mm to 0.27 mm, and the twist is 1300 twists / meter to 3000 twists / meter.

[0007] The core metal wire is a stainless steel monofilament with a diameter of 0.04 mm to 0.09 mm.

[0008] Both the core wire and the outer wire are made of 304, 316 or 316L stainless steel.

[0009] Secondly, the present invention provides an apparatus for preparing metal sewing thread for sewing machines, comprising:

[0010] Multiple wire feeding devices are used to wind metal wires for making metal sewing thread;

[0011] A tension control device is used to introduce the metal wire on the wire feeding device and provide resistance to tension the metal wire, and is set up in correspondence with the wire feeding device;

[0012] A twisting device is used to twist multiple metal wires around a core metal wire to form a metal wire.

[0013] A straightening device used to straighten metal wires;

[0014] High-temperature annealing equipment is used to heat straightened metal wires.

[0015] Guide pulleys are used to guide metal wires and heat-treated metal wires.

[0016] A winding device is used to wind and hold heat-treated metal wire.

[0017] The wire feeding device includes:

[0018] A core wire feeding device for winding core wires;

[0019] Multiple external metal wire feeding devices are used to wind external metal wires. The external metal wire feeding devices are arranged in groups of two, so that two external metal wires are wound onto the core metal wire at the same time.

[0020] The straightening device includes two rows of guide wheels spaced apart, with the included angle α between three adjacent guide wheels being 30°–90°.

[0021] Thirdly, the present invention provides a method for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines. The method is based on the aforementioned apparatus for preparing metal sewing thread for sewing machines and includes the following steps:

[0022] First, the core metal wire is led out through the tension control device and enters the twisting device; inside the twisting device, the outer metal wire is led out through the tension control device and wound around the outside of the core metal wire in pairs. During the winding process, both the core metal wire and the outer metal wire are twisted, with a twist of 1300 twists / meter to 3000 twists / meter. After the winding is completed, a metal wire is obtained.

[0023] Then, the metal wire is passed through a straightening device to straighten it, and then enters a high-temperature annealing device for heating and annealing until the metal wire temperature reaches 200℃-300℃. After annealing, it is wound onto a winding device and allowed to cool naturally to obtain metal sewing thread.

[0024] Fourthly, the present invention provides a sewing machine for ultra-high temperature resistant ultra-fine metal sewing thread, comprising: a metal sewing thread guiding device, a rotary hook, and a synchronization control device. The metal sewing thread guiding device is used to fix and guide the aforementioned metal sewing thread. The metal sewing thread guiding device is fixed to the sewing machine head, and the metal sewing thread guiding device includes:

[0025] Metal sewing thread spools are used for the orderly winding and storage of metal sewing thread.

[0026] An active reverse damping tension controller is used to secure a spool of metal sewing thread and provide reverse damping tension to keep the metal sewing thread taut.

[0027] The sliding guide rod is used to limit the metal sewing thread. The sliding guide rod is fixed to the top of the sewing machine head. The included angle b formed by the metal sewing thread at the sliding guide rod is 120°-165°.

[0028] The top guide pulley is used to guide the metal sewing thread horizontally. The top guide pulley is fixed to the top of the sewing machine head, and the bottom of the top guide pulley slides in cooperation with the metal sewing thread.

[0029] The yarn guide hole is used to change the direction of the metal sewing thread. The yarn guide hole is located above the sewing machine head.

[0030] The directional pulley is used to vertically guide the metal sewing thread. The directional pulley is fixed in the middle of the sewing machine head.

[0031] A sewing needle, used to sew metal sewing thread through a needle eye, the diameter of which is 1.4mm-2.2mm;

[0032] The presser foot is used to move the sewing needle up and down to hold down the fabric to be sewn.

[0033] The rotary hook is used in conjunction with a sewing needle to form a lock-lock stitch structure between two metal sewing threads;

[0034] The synchronization control device is used to control the sewing needle, presser foot and rotary hook to work in sync for sewing.

[0035] Fifthly, the present invention provides a multi-layer thermal insulation material sewing structure, comprising multiple layers of thermal insulation material, wherein the multiple layers of thermal insulation material are sewn together on a sewing machine using the aforementioned metal sewing thread.

[0036] The multilayer thermal insulation material is composed of a high-temperature resistant metal film and a high-temperature resistant fabric;

[0037] The high-temperature resistant metal film is one of nickel foil, stainless steel foil, or aluminum foil with a thickness of 0.05~0.2mm;

[0038] The high-temperature resistant fabric is one of the following: glass fiber fabric, quartz fiber fabric, basalt fiber fabric, or alumina fiber fabric, with a thickness of 0.1~0.3mm.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] 1. The present invention relates to a twisting and annealing process for a metal sewing thread used in a sewing machine, which can effectively meet the elasticity and tensile strength requirements of automated machine sewing. Specifically, the twisting process increases the flexibility of the sewing thread, and further annealing can improve the plasticity of the metal wire, increase the elasticity of the metal thread, and avoid plastic deformation.

[0041] 2. The external metal wire feeding device of the present invention has a structure in which the two metal wires are wound in pairs, which can effectively reduce the breakage of single metal wires during the manufacturing process and effectively overcome the problem that the 0.04~0.09mm metal single wires have low strength and are prone to breakage when twisted together. At the same time, twisting in pairs can reduce the length and footprint of the entire device. The design of multiple guide pulleys helps to reduce the friction generated by the metal during guidance, further reducing the possibility of wire breakage. The included angle α formed between three adjacent guide wheels in the straightening device is 30°-90°, which makes it less likely for the wire to break and ensures the straightening effect. For the stainless steel metal wire of this application, if the straightening angle is too small, the straightening effect is poor, and if the straightening angle is too large, the metal wire is prone to breakage.

[0042] 3. The present invention employs an annealing process in a method for preparing metal sewing thread for sewing machines to improve the softness and tensile strength of stainless steel sewing thread. At the same time, it considers the sewing thread structure of multi-metal wire winding and twisting, so that it can adapt to the up and down movement trajectory of the sewing needle without producing plastic deformation.

[0043] 4. The present invention provides a metal sewing machine for sewing thread, which employs an active reverse damping tension controller in conjunction with a subsequent guiding structure to form a metal sewing thread guiding device. This ensures the smooth threading, pulling, and retraction of the stainless steel ultra-fine metal sewing thread. In particular, the design of the active reverse damping tension controller can provide an upward pulling force to the metal sewing thread when the sewing needle is lifted, maintaining the sewing thread shape while ensuring the formation of the lockstitch structure.

[0044] 5. In the multi-layer heat insulation material sewing structure of the present invention, stainless steel metal sewing thread is used to complete the sewing by a sewing machine. The sewing stitches are neat, the sewing holes are small, and the overall flatness is better. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of the metal sewing thread for the sewing machine of the present invention.

[0046] Figure 2 This is a schematic diagram of the structure of the metal sewing thread preparation device for sewing machines according to the present invention.

[0047] Figure 3 This is a schematic diagram of the structure of the sewing machine for metal sewing thread according to the present invention.

[0048] Figure 4 yes Figure 3 Top view of the sliding guide rod 43.

[0049] Figure 5 This is a schematic diagram of a lock-lock stitch structure formed by sewing metal thread with a sewing machine in the multi-layer thermal insulation material sewing structure of the present invention.

[0050] In the diagram: 1. Metal sewing thread; 11. Core metal wire; 12. Outer metal wire; 2. Multi-layer heat insulation material; 21. High-temperature resistant metal film; 22. High-temperature resistant fabric; 31. Metal wire feeding device; 311. Core metal wire feeding device; 312. Outer metal wire feeding device; 32. Tension control device; 33. Torsion device; 34. Straightening device; 341. Guide wheel; 35. High-temperature annealing device; 36. Guide pulley; 37. Winding device; 4. Metal sewing thread guide device; 41. Metal sewing thread roll; 42. Active reverse damping tension controller; 43. Sliding guide rod; 44. Top guide pulley; 45. Yarn guide hole; 46. Directional pulley; 47. Sewing needle; 48. Presser foot; 5. Rotary hook; 6. Synchronization control device. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1:

[0053] See Figure 1A high-temperature resistant, ultra-fine metal sewing thread for sewing machines, wherein the metal sewing thread 1 is formed by twisting six outer metal wires 12 together with a core metal wire 11; the core metal wire 11 has the same diameter as the outer metal wires 12, and the diameter of the metal sewing thread 1 for sewing machines is 0.12 mm to 0.27 mm, and the twist is 1300 twists / meter to 3000 twists / meter.

[0054] The core metal wire 11 is a stainless steel monofilament with a diameter of 0.04 mm to 0.09 mm.

[0055] Both the core metal wire 11 and the outer metal wire 12 are made of 304, 316 or 316L stainless steel.

[0056] For stainless steel monofilaments with a diameter of 0.04 mm to 0.09 mm, their diameter is extremely fine, their strength is low, and they are not resistant to friction. Ordinary sewing thread manufacturing equipment involves a large amount of friction between the yarn itself and between the yarn and the machine. This application provides a production device that reduces friction by using pulleys and twisting equipment:

[0057] A device for preparing metal sewing thread for sewing machines, comprising:

[0058] Multiple wire feeding devices 31 are used to wind metal wires for making metal sewing threads;

[0059] Tension control device 32 is used to introduce the metal wire on the metal wire feeding device 31 and provide resistance to tension the metal wire, and is set accordingly to the metal wire feeding device 31;

[0060] The twisting device 33 is used to twist multiple metal wires around the core metal wire 11 to form a metal wire.

[0061] Straightening device 34 is used to straighten metal wires;

[0062] High-temperature annealing device 35 is used to heat the straightened metal wire.

[0063] Guide pulley 36 is used to guide the metal wire and the heat-treated metal wire;

[0064] The winding device 37 is used to wind and hold the heat-treated metal wire.

[0065] The wire feeding device 31 includes:

[0066] Core wire feeding device 311, used for winding core wire 11;

[0067] Multiple external metal wire feeding devices 312 are used to wind external metal wires 12. The external metal wire feeding devices 312 are in groups of two, so that two external metal wires 12 are simultaneously wound onto the core metal wire 11.

[0068] The straightening device 34 includes two rows of guide wheels 341 spaced apart, with the included angle α between three adjacent guide wheels being 30°–90°.

[0069] A method for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines, the method being based on the aforementioned sewing machine metal sewing thread preparation device, and comprising the following steps:

[0070] First, the core metal wire 11 is led out through the tension control device 32 and enters the twisting device 33; inside the twisting device 33, the outer metal wire 12 is led out through the tension control device 32 and wound around the outside of the core metal wire 11 in pairs. During the winding process, both the core metal wire 11 and the outer metal wire 12 are twisted, with a twist of 1300 twists / meter to 3000 twists / meter. After the winding is completed, a metal wire is obtained.

[0071] For metal sewing thread 1 with a diameter of 0.12 mm to 0.27 mm, the diameter is very fine, and such metal is prone to plastic deformation. This application improves the toughness by wrapping and twisting multiple metal wires.

[0072] Then, the metal wire is passed through the straightening device 34 for straightening, and then enters the high-temperature annealing device 35 for heating and annealing so that the temperature of the metal wire reaches 200℃-300℃. After annealing, it is wound onto the winding device 37 and cooled naturally to obtain the metal sewing thread 1.

[0073] In order to further improve the performance of stainless steel, this application designs an annealing process to shape the stainless steel sewing thread while reducing its plasticity.

[0074] A sewing machine for ultra-high temperature resistant ultra-fine metal sewing thread includes: a metal sewing thread guide device (4), a rotary hook (5), and a synchronization control device (6). The metal sewing thread guide device 4 is used to fix and guide the aforementioned metal sewing thread 1. The metal sewing thread guide device 4 is fixed to the sewing machine head. The metal sewing thread guide device 4 includes:

[0075] Metal sewing thread spool 41, used for orderly winding and storing metal sewing thread 1;

[0076] An active reverse damping tension controller 42 is used to fix the metal sewing thread roll 41 and provide reverse damping tension to keep the metal sewing thread 1 taut.

[0077] The sliding guide rod 43 is used to limit the metal sewing thread 1. The sliding guide rod 43 is fixed to the top of the sewing machine head. The included angle b formed by the metal sewing thread 1 at the sliding guide rod 43 is 120°-165°.

[0078] The top guide pulley 44 is used to guide the metal sewing thread 1 horizontally. The top guide pulley 44 is fixed to the top of the sewing machine head, and the bottom of the top guide pulley 44 slides in cooperation with the metal sewing thread 1.

[0079] The yarn guide hole 45 is used to change the direction of the metal sewing thread 1. The yarn guide hole 45 is located above the sewing machine head.

[0080] The directional pulley 46 is used to vertically guide the metal sewing thread 1. The directional pulley 46 is fixed to the middle part of the sewing machine head.

[0081] A sewing needle 47 is used to sew metal sewing thread 1 through a needle hole thereon, the diameter of the sewing needle 47 being 1.4 mm - 2.2 mm;

[0082] The rotary hook 2 is used in conjunction with the sewing needle 47 to form a lock-lock stitch structure with the two metal sewing threads 1.

[0083] Presser foot (48) is used to move up and down with sewing needle (47) to press down the fabric to be sewn;

[0084] The rotary hook (5) is used in conjunction with the sewing needle (47) to form a lock-lock stitch structure with two metal sewing threads (1);

[0085] The synchronization control device (6) is used to control the sewing needle (47), presser foot (48) and rotary hook (5) to work together synchronously for sewing.

[0086] A multi-layer thermal insulation material sewing structure includes multiple layers of thermal insulation material (2), wherein the multiple layers of thermal insulation material (2) are sewn together on a sewing machine using metal sewing thread (1).

[0087] The multilayer thermal insulation material (2) is composed of a high-temperature resistant metal film (21) and a high-temperature resistant fabric (22);

[0088] The high-temperature resistant metal film (21) is one of nickel foil, stainless steel foil, or aluminum foil with a thickness of 0.05~0.2mm;

[0089] The high-temperature resistant fabric (22) is one of glass fiber fabric, quartz fiber fabric, basalt fiber fabric, or alumina fiber fabric with a thickness of 0.1~0.3mm.

[0090] Example 2:

[0091] Example 2 is basically the same as Example 1, except that:

[0092] The metal sewing thread 1 is made of seven 0.07mm diameter stainless steel monofilaments of type 316L twisted together. The structure of the metal sewing thread 1 is shown in the attached figure. Figure 2 As shown. The prepared metal sewing thread 1 has a twist of 2669 twists / meter and a diameter of 0.21 mm.

[0093] The high-temperature annealing temperature is 260℃.

[0094] The prepared high-temperature resistant ultrafine metal sewing thread 1 has high temperature resistance and corrosion resistance, and a tensile strength of 83N.

[0095] A multi-layer heat insulation material is composed of a high-temperature resistant metal film and a high-temperature resistant fabric. The ultra-fine stainless steel metal thread is installed on the metal sewing thread guide device 4 to sew the multi-layer heat insulation material. The sewing machine is turned on to make the presser foot, sewing needle 47 and rotary hook 2 move synchronously and in coordination to ensure the automated sewing of the ultra-fine stainless steel metal sewing thread 1, forming a lock stitch structure with a stitch spacing of 13mm and a sewing speed of 150 revolutions per minute.

[0096] The active reverse damping tension controller 42 is equipped with an active reverse damping motor to regulate the damping force.

[0097] The ultra-fine stainless steel sewing thread used in the multi-layer thermal insulation material produces uniform, clear, and regular automated stitches. The resulting multi-layer sewn fabric exhibits excellent integrity, heat radiation resistance, and can withstand temperatures up to 800℃.

[0098] The high-temperature resistant metal film is a nickel foil with a thickness of 0.1 mm.

[0099] The high-temperature resistant fabric is an alumina fiber fabric with a thickness of 0.13 mm.

[0100] Example 3:

[0101] Example 3 is basically the same as Example 2, except that:

[0102] The prepared metal sewing thread 1 has a twist of 1358 twists / meter. The automated sewing stitch length of the ultra-fine stainless steel metal sewing thread 1 is 10mm, and the sewing speed is 100 revolutions / minute.

[0103] The prepared high-temperature resistant ultrafine stainless steel sewing thread 1 is more flexible than that of Example 2, with a tensile strength of 69N. The automated sewing stitches made with this ultrafine stainless steel thread for multilayer insulation materials are uniform, clear, and regular, with a smaller stitch length than that of Example 2.

[0104] Example 4:

[0105] Example 4 is basically the same as Example 2, except that:

[0106] The metal sewing thread 1 can be made by twisting seven 0.07mm diameter stainless steel monofilaments of type 304.

[0107] The high-temperature resistant metal film is a nickel foil with a thickness of 0.08 mm.

[0108] The high-temperature resistant fabric is a quartz fiber fabric with a thickness of 0.15 mm.

[0109] The prepared high-temperature resistant ultrafine stainless steel sewing thread 1 possesses high-temperature resistance and a tensile strength of 86N. The ultrafine stainless steel sewing thread 1, used in multi-layer thermal insulation materials, produces neat and clear stitches for automated sewing. The prepared multi-layer sewn fabric exhibits excellent integrity, lightweight, and heat radiation resistance, and can withstand temperatures up to 700℃.

[0110] Example 5:

[0111] Example 5 is basically the same as Example 2, except that:

[0112] The metal sewing thread 1 can be made by twisting seven 0.06mm diameter stainless steel monofilaments of model 316L.

[0113] The high-temperature resistant metal film is a nickel foil with a thickness of 0.12 mm.

[0114] The high-temperature resistant fabric is a basalt fiber fabric with a thickness of 0.12 mm.

[0115] The prepared high-temperature resistant ultrafine stainless steel sewing thread 1 possesses high-temperature resistance and corrosion resistance, with a tensile strength of 72N. The ultrafine stainless steel sewing thread 1, used in multi-layer thermal insulation materials, produces neat and clear stitches for automated sewing. The prepared multi-layer sewn fabric exhibits excellent integrity, lightweight, low cost, and heat radiation resistance, and can withstand temperatures up to 600℃.

[0116] Example 6:

[0117] Example 6 is basically the same as Example 4, except that:

[0118] The high-temperature resistant metal film is an aluminum foil with a thickness of 0.1 mm.

[0119] The high-temperature resistant fabric is a glass fiber fabric with a thickness of 0.1 mm.

[0120] The prepared multi-layer stitched fabric is lighter and lower cost than that of Example 4, can withstand high temperature of 200°C, and has neat and clear automated stitches of ultrafine stainless steel metal wires for use in multi-layer thermal insulation materials.

[0121] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the technology and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A high-temperature resistant, ultra-fine metal sewing thread for sewing machines, characterized in that: The metal sewing thread (1) is made by twisting six outer metal wires (12) together with a core metal wire (11); the core metal wire (11) and the outer metal wires (12) have the same diameter and material. The diameter of the sewing machine metal sewing thread (1) is 0.12 mm to 0.27 mm, and the twist is 1300 twists / meter to 3000 twists / meter.

2. The ultra-high temperature resistant, ultra-fine metal sewing thread for sewing machines according to claim 1, characterized in that: The core metal wire (11) is a stainless steel monofilament with a diameter of 0.04 mm to 0.09 mm.

3. The ultra-high temperature resistant, ultra-fine metal sewing thread for sewing machines according to claim 1, characterized in that: Both the core metal wire (11) and the outer metal wire (12) are made of 304, 316 or 316L stainless steel.

4. A device for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines as described in claim 1, 2, or 3, characterized in that, The metal sewing thread preparation device (3) includes: Multiple wire feeding devices (31) are used to wind metal wires for making metal sewing thread; Tension control device (32) is used to introduce the metal wire on the metal wire feeding device (31) and provide resistance to tension the metal wire, and is set in correspondence with the metal wire feeding device (31); The twisting device (33) is used to twist multiple metal wires around the core metal wire (11) to form a metal wire; A straightening device (34) is used to straighten metal wires; High-temperature annealing apparatus (35) is used to heat-treat straightened metal wires; Guide pulley (36) is used to guide the metal wire and the heat-treated metal wire; A winding device (37) is used to wind and hold the heat-treated metal wire.

5. The device for preparing metal sewing thread for sewing machines according to claim 4, characterized in that: The wire feeding device (31) includes: A core metal wire feeding device (311) is used to wind the core metal wire (11); Multiple external metal wire feeding devices (312) are used to wind external metal wires (12). The external metal wire feeding devices (312) are in groups of two, so that two external metal wires (12) are simultaneously wound onto the core metal wire (11).

6. The device for preparing metal sewing thread for sewing machines according to claim 4, characterized in that: The straightening device (34) includes two rows of guide wheels (341) spaced apart, with the included angle α between three adjacent guide wheels being 30°–90°.

7. A method for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines, characterized in that, The preparation method is based on the metal sewing thread preparation apparatus according to claim 4, 5 or 6, and the preparation method includes the following steps: First, the core metal wire (11) is led out through the tension control device (32) and enters the twisting device (33); inside the twisting device (33), the outer metal wire (12) is led out through the tension control device (32) and wound around the outside of the core metal wire (11) in pairs. During the winding process, both the core metal wire (11) and the outer metal wire (12) are twisted, with a twist of 1300 twists / meter to 3000 twists / meter. After the winding is completed, a metal wire is obtained. Then, the metal wire is passed through the straightening device (34) for straightening, and then enters the high-temperature annealing device (35) for heating and annealing so that the temperature of the metal wire reaches 200℃-300℃. After annealing, it is wound onto the winding device (37) and cooled naturally to obtain metal sewing thread (1).

8. A special sewing machine for use with ultra-high temperature resistant, ultra-fine metal sewing thread as described in claim 1, 2, or 3, characterized in that, include: The sewing machine includes a metal thread guide (4), a rotary hook (5), and a synchronization control device (6). The metal thread guide (4) is used to fix and guide the metal sewing thread (1). The metal thread guide (4) is fixed to the sewing machine head. The metal thread guide (4) includes: Metal sewing thread spool (41) for orderly winding and storing metal sewing thread (1); An active reverse damping tension controller (42) is used to fix the metal sewing thread roll (41) and provide reverse damping tension to straighten the metal sewing thread (1). The sliding guide rod (43) is used to limit the metal sewing thread (1). The sliding guide rod (43) is fixed to the top of the sewing machine head. The included angle b formed by the metal sewing thread (1) at the sliding guide rod (43) is 120°-165°. The top guide pulley (44) is used to guide the metal sewing thread (1) horizontally. The top guide pulley (44) is fixed to the top of the sewing machine head, and the bottom of the top guide pulley (44) slides in cooperation with the metal sewing thread (1). The yarn guide hole (45) is used to change the direction of the metal sewing thread (1). The yarn guide hole (45) is located above the sewing machine head. The directional pulley (46) is used to vertically guide the metal sewing thread (1), and the directional pulley (46) is fixed in the middle part of the sewing machine head; A sewing needle (47) for sewing a metal sewing thread (1) through a needle hole thereon, the sewing needle (47) having a diameter of 1.4 mm - 2.2 mm; Presser foot (48) is used to move up and down with sewing needle (47) to press down the fabric to be sewn; The rotary hook (5) is used in conjunction with the sewing needle (47) to form a lock-lock stitch structure with two metal sewing threads (1); The synchronization control device (6) is used to control the sewing needle (47), presser foot (48) and rotary hook (5) to work together synchronously for sewing.

9. A multi-layer thermal insulation material sewing structure, characterized in that: Includes a multi-layer thermal insulation material (2), said multi-layer thermal insulation material (2) is sewn on a sewing machine using the metal sewing thread (1) as described in any one of claims 1, 2 or 3. The multilayer thermal insulation material (2) is composed of a high-temperature resistant metal film (21) and a high-temperature resistant fabric (22); The high-temperature resistant metal film (21) is one of nickel foil, stainless steel foil, or aluminum foil with a thickness of 0.05~0.2mm; The high-temperature resistant fabric (22) is one of glass fiber fabric, quartz fiber fabric, basalt fiber fabric, or alumina fiber fabric with a thickness of 0.1~0.3mm.

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