Novel cord thread variable-angle air spring bag skin and manufacturing method thereof

Abstract

The invention discloses a novel cord thread variable-angle air spring bag skin which comprises inner-layer rubber, outer-layer rubber and a cord thread layer arranged between the inner-layer rubber and the outer-layer rubber. The cord thread layer comprises first-layer cord thread variable-angle cord fabric inner side rubber, first-layer cord thread variable-angle cord fabric, first-layer cord thread variable-angle cord fabric outer side rubber, second-layer cord thread variable-angle cord fabric inner side rubber and second-layer cord thread variable-angle cord fabric which are sequentially arranged from inside to outside; a traditional cord thread layer is optimized, the mode of combining the double-layer inner side rubber, the cord thread edge angle cord fabric layer fabric and the outer side rubber is adopted, a symmetrical cord thread angle mode is adopted for the double-layer structure, and under the condition that the overall low rigidity is met, the cord thread angle capable of effectively prolonging the fatigue life is arranged for an easily-bent area, so that the overall rigidity is improved. The problem of short fatigue life of a local area is solved, and the service life of the air spring bag is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile air springs, and in particular relates to a novel cord variable-angle air spring bladder skin and a manufacturing method thereof. Background Art

[0002] Since the birth of automobiles, people have been pursuing higher performance cars, and the performance of suspension directly determines the performance of passenger cars. Compared with traditional McPherson suspension, air suspension can meet the requirements of automobile load-bearing and low stiffness, making the car have better comfort and driving smoothness.

[0003] Air springs are an important part of air suspensions and directly determine the performance of air suspensions. Air springs are mainly composed of rubber airbags, upper cover plates, bases and other components, and are filled with compressed gas. The rubber airbags, upper cover plates and bases form a closed space that can provide strong support for the car. Therefore, rubber airbags are very important for air springs. Existing rubber airbags are usually vulcanized by inner and outer covering layers (inner rubber layer, outer rubber layer) and cord layers. The inner and outer covering layers are mainly made of rubber materials. The outer layer plays a role in heat resistance, oil resistance and weather erosion resistance, and the inner covering layer mainly provides sealing and pressure resistance. The cord layer plays a decisive role in the durability and stiffness of the air spring, and its fiber material and structure have a direct impact on the safety and service life of the air spring.

[0004] At present, the cord layer of passenger car air springs is mainly composed of two layers of fiber bundles arranged symmetrically and crosswise. The angle between the fiber bundle and the axial direction of the air spring is called the cord angle. The size of the cord angle has a direct impact on the performance of the air spring. Such as stiffness, life and other performance parameters, which directly affects the performance of the car. The existing air spring uses the same cord angle for the entire layer of cord. The most important performance indicators of air springs are stiffness and fatigue life. The traditional passenger car air spring cannot meet the requirements of low stiffness while taking into account the high fatigue life of the air spring when the entire layer of cord angle is the same. The bending part is prone to local fatigue failure. Therefore, under the condition of meeting the overall low stiffness, how to effectively improve the service life of the air spring bladder skin has become an urgent problem to be solved. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a novel cord variable-angle air spring bag skin and a manufacturing method thereof.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a new type of cord variable angle air spring bag skin, including an inner layer rubber, an outer layer rubber, and a cord layer arranged between the inner layer rubber and the outer layer rubber, the cord layer including a first layer of cord variable angle cord layer fabric inner side rubber, a first layer of cord variable angle cord layer fabric, a first layer of cord variable angle cord layer fabric outer side rubber, a second layer of cord variable angle cord layer fabric inner side rubber, a second layer of cord variable angle cord layer fabric, and a second layer of cord variable angle cord layer fabric outer side rubber, which are arranged in sequence from inside to outside; the inner layer rubber is bonded to the inner side rubber of the first layer of cord variable angle cord layer fabric; the outer layer rubber is bonded to the outer side rubber of the second layer of cord variable angle cord layer fabric.

[0007] A novel method for manufacturing a cord variable angle air spring bladder skin, the manufacturing method is as follows:

[0008] S1. Two air spring cord fibers are installed on a horizontal circular braiding machine through a yarn tube, and a mandrel of a predetermined size and shape is installed on the horizontal circular braiding machine;

[0009] S2, cutting the inner rubber into a specific size, wrapping it on the core shaft of the horizontal circular braiding machine, and completely wrapping the core shaft;

[0010] S3, cutting the inner rubber of the first layer of variable angle cord ply fabric of a specific size, and wrapping it on the mandrel formed in S2, so that it completely overlaps with the inner rubber layer and completely wraps the mandrel formed in S2;

[0011] S4, the air spring cord fibers are woven by a horizontal circular braiding machine to form a first layer of cord variable angle cord fabric, and are woven on the mandrel formed in S3, and completely wrap the mandrel formed in S3;

[0012] S5, cutting the outer rubber of the first layer of variable angle cord ply fabric to a specific size, and wrapping it on the mandrel formed in S4, so that it completely overlaps with the inner rubber of the first layer of variable angle cord ply fabric, and completely wraps the mandrel formed in S4;

[0013] S6, cutting the inner rubber of the second layer of variable angle cord ply fabric of a specific size, and wrapping it on the mandrel formed in S5, so that it completely overlaps with the outer rubber of the second layer of variable angle cord ply fabric, and completely wraps the mandrel formed in S5;

[0014] S7, the air spring cord fibers are woven by a horizontal circular braiding machine to form a second layer of cord variable angle cord fabric, and the second layer of air spring cord fabric is woven on the mandrel formed in S6, and the mandrel formed in S6 is completely wrapped;

[0015] S8, cutting the outer rubber of the second layer of variable angle cord ply fabric of a specific size, wrapping it on the mandrel formed in S7, so that it completely overlaps with the inner rubber of the second layer of variable angle cord ply fabric, and completely covering the second layer of variable angle cord ply fabric and completely wrapping it around the mandrel formed in S7;

[0016] S9, cutting the outer rubber of a specific size, and wrapping it on the mandrel formed in S8, so that it completely overlaps with the outer rubber of the second layer of variable angle cord ply fabric, and completely wraps the mandrel formed in step S8 to form a preformed bladder skin;

[0017] S10, separating the preformed bladder skin formed in S9 from the mandrel and vulcanizing it.

[0018] Furthermore, the core shaft of the horizontal annular braiding machine is made of metal.

[0019] Furthermore, the thickness of the inner rubber layer is 0.1 mm-5 mm.

[0020] Further, the thickness of the rubber on the inner side of the first layer of variable angle cord ply fabric is 0.05mm-5mm;

[0021] The thickness of the rubber on the outer side of the first layer of variable angle cord ply fabric is 0.05mm-5mm;

[0022] The thickness of the rubber on the inner side of the second layer of variable angle cord ply fabric is 0.05mm-5mm;

[0023] The thickness of the rubber on the outer side of the second layer of variable-angle cord ply fabric is 0.05mm-5mm.

[0024] Furthermore, the thickness of the outer rubber layer is 0.1-5 mm.

[0025] Furthermore, the fiber materials of the first layer of variable-angle cord ply fabric and the second layer of variable-angle cord ply fabric are both nylon fibers or aramid fibers impregnated with RFL.

[0026] Furthermore, the first layer of variable-angle cord ply fabric and the second layer of variable-angle cord ply fabric both include warp threads and weft threads; the density of the warp threads is 10-300 threads / dm; and the density of the weft threads is 1-20 threads / dm.

[0027] Furthermore, the axial angle between the warp and the core shaft of the horizontal annular braiding machine is 0-75 degrees; the axial angle between the weft and the core shaft of the horizontal annular braiding machine is 0-75 degrees.

[0028] Compared with the prior art, the present invention has the following beneficial effects: the present invention optimizes the traditional cord layer, and for the first time adopts a horizontal circular braiding machine for integrated weaving and production of air spring bag skins, with high production efficiency, and adopts a double-layer inner rubber, a cord variable-angle cord layer fabric, and an outer rubber combination. The double-layer structure adopts a symmetrical cord angle method. Under the condition of meeting the overall low stiffness, for areas prone to bending, a cord angle that can effectively improve the fatigue life is set, thereby solving the problem of low fatigue life in local areas and thereby improving the service life of the air spring bag skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flow chart of a method for making an air spring bladder skin in the present application document;

[0030] Figure 2 is a cross-sectional view of the air spring bag skin in the present application document;

[0031] Figure 3 It is a schematic diagram of the fabric structure of the first layer of variable angle cord ply in this application document;

[0032] Figure 4 It is a schematic diagram of the fabric structure of the second layer of variable angle cord ply in this application document.

[0033] In the figure: 1. core shaft; 2. inner rubber layer; 3. inner rubber of first layer of variable angle cord ply fabric; 4. first layer of variable angle cord ply fabric; 5. outer rubber of first layer of variable angle cord ply fabric; 6. inner rubber of second layer of variable angle cord ply fabric; 7. second layer of variable angle cord ply fabric; 8. outer rubber of second layer of variable angle cord ply fabric; 9. outer rubber layer; 10. first nylon 66 fiber line; 11. second nylon 66 fiber line;. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-Figure 4 As shown, the technical solution adopted by the present invention is as follows:

[0036] The present embodiment provides a novel cord variable angle air spring bladder, comprising a rubber layer, an outer rubber layer 9, and a cord layer arranged between the inner rubber layer 2 and the outer rubber layer 9. The cord layer comprises a first layer of cord variable angle cord layer fabric inner rubber 3, a first layer of cord variable angle cord layer fabric 4, a first layer of cord variable angle cord layer fabric outer rubber 5, a second layer of cord variable angle cord layer fabric inner rubber 6, a second layer of cord variable angle cord layer fabric 7, and a second layer of cord variable angle cord layer fabric outer rubber 8, which are sequentially arranged from the inside to the outside; the inner rubber layer 2 is bonded to the first layer of cord variable angle cord layer fabric inner rubber 3; and the outer rubber layer 9 is bonded to the second layer of cord variable angle cord layer fabric outer rubber 8.

[0037] In this embodiment, the diameter of the air spring airbag is 90 mm and the length is 400 mm.

[0038] In this embodiment, the fiber materials of the first layer of variable angle cord ply fabric 4 and the second layer of variable angle cord ply fabric 7 are both nylon fibers or aramid fibers impregnated with RFL. Preferably, the twisted cord is treated by impregnation with RFL impregnation liquid. For the convenience of description, the fiber materials of the first layer of variable angle cord ply fabric 4 and the second layer of variable angle cord ply fabric 7 are recorded as air spring cord fibers. In the production process of the novel variable angle cord air spring bag skin, two air spring cord fibers need to be woven by a horizontal circular braiding machine. The two air spring cord fibers are the first nylon 66 fiber line 10 and the second nylon 66 fiber line 11. The first nylon 66 fiber line 10 and the second nylon 66 fiber line 11 are both impregnated with RFL. The diameter of the first nylon 66 fiber line 10 is 0.55 mm, and the diameter of the second nylon 66 fiber line 11 is 0.1 mm.

[0039] This embodiment provides a method for manufacturing a novel cord variable angle air spring bladder skin, and the manufacturing method is as follows:

[0040] S1, two air spring cord fibers are installed on a horizontal circular braiding machine through a yarn tube, and a core shaft 1 of a predetermined size and shape is installed on the horizontal circular braiding machine;

[0041] S2, cutting the inner rubber layer 2 into a specific size, wrapping it on the core shaft 1 of the horizontal circular braiding machine, and completely wrapping the core shaft 1;

[0042] S3, cutting the inner rubber 3 of the first layer of variable angle cord ply fabric of a specific size, and wrapping it on the mandrel 1 formed in S2, so that it completely overlaps with the inner rubber 2 and completely wraps the mandrel 1 formed in S2;

[0043] S4, the air spring cord fibers are woven by a horizontal circular braiding machine to form a first layer of cord variable angle cord fabric 4, and woven on the core shaft 1 formed in S3, and completely wrap the core shaft 1 formed in S3;

[0044] S5, cutting the outer rubber 5 of the first layer of variable angle cord ply fabric of a specific size, and wrapping it on the mandrel 1 formed in S4, so that it completely overlaps with the inner rubber 3 of the first layer of variable angle cord ply fabric, and completely wraps the mandrel 1 formed in S4;

[0045] S6, cutting the inner rubber 6 of the second layer of variable angle cord ply fabric of a specific size, and wrapping it on the mandrel 1 formed in S5, so that it completely overlaps with the outer rubber 8 of the second layer of variable angle cord ply fabric, and completely wraps the mandrel 1 formed in S5;

[0046] S7, the air spring cord fibers are woven by a horizontal circular braiding machine to form a second layer of cord variable angle cord fabric 7, and woven on the core shaft 1 formed in S6, and completely wrap the core shaft 1 formed in S6;

[0047] S8, cutting the outer rubber 8 of the second layer of variable angle cord ply fabric of a specific size, and wrapping it on the mandrel 1 formed in S7, so that it completely overlaps with the inner rubber 6 of the second layer of variable angle cord ply fabric, and completely covers the second layer of variable angle cord ply fabric 7 and completely wraps the mandrel 1 formed in S7;

[0048] S9, cutting the outer rubber 9 of a specific size, and wrapping it on the mandrel 1 formed in S8, so that it completely overlaps with the outer rubber 8 of the second layer of variable angle cord ply fabric, and completely wraps the mandrel 1 formed in step S8 to form a preformed bladder skin;

[0049] S10, separating the preformed bladder skin formed in S9 from the core shaft 1, and vulcanizing and forming.

[0050] In S1, the air spring cord fiber is wound on the yarn tube of the horizontal circular braiding machine by using a yarn doubling machine; the yarn tube with the wound air spring cord fiber is manually installed on the horizontal circular braiding machine; and the core shaft 1 of a predetermined size and shape is installed on the horizontal circular braiding machine.

[0051] In this embodiment, the inner rubber layer 2 and the outer rubber layer 9 are both made of raw rubber mixed with natural rubber and chloroprene rubber.

[0052] In S2, the raw rubber for the inner layer rubber 2 is mixed and molded into a sheet according to the preset thickness of the inner layer rubber 2, and cut into corresponding sizes according to the size of the core shaft 1. The core shaft 1 is completely wrapped. During this period, a layer of mold release agent, such as Flash-R-505 rubber mold release agent, is first sprayed on the surface of the core shaft 1 to facilitate demolding in S10.

[0053] In S3-S5, the braiding pitch and braiding distance of the first section of the air spring skin are set in the parameter setting of the horizontal circular braiding machine, and the horizontal circular braiding machine is started to braid the air spring cord fibers on the core shaft 1; after the machine stops automatically, the braiding pitch and braiding distance of the second section of the air spring skin are set in the parameter setting, and the horizontal circular braiding machine is started again to continue to braid the air spring cord fibers on the core shaft 1; after the machine stops automatically, the braiding pitch and braiding distance of the third section of the air spring skin are set in the parameter setting, and the horizontal circular braiding machine is started again to continue to braid the air spring cord fibers on the core shaft 1; it should be noted here that the braiding distance here is the height of different areas of the skin; the braiding pitch controls the cord angles of different areas, and different braiding pitches can achieve different braiding angles. It should be further noted that the machine will stop automatically during this process, but the cord fibers are still continuous and will not be disconnected, so the entire layer of cord fibers is continuous, but the cord angles of different areas are different.

[0054] In S7, the weaving pitch and weaving distance of the first section of the air spring bladder are set in the parameter setting of the horizontal circular braiding machine, and the horizontal circular braiding machine is started to weave the air spring cord fibers on the core shaft 1; after the machine stops automatically, the weaving pitch and weaving distance of the second section of the air spring bladder are set in the parameter setting, and the horizontal circular braiding machine is started again to continue weaving the air spring cord fibers on the core shaft 1; after the machine stops automatically, the weaving pitch and weaving distance of the third section of the air spring bladder are set in the parameter setting, and the horizontal circular braiding machine is started again to continue weaving the air spring cord fibers on the core shaft 1. It should be noted here that the weaving pitch and weaving distance set in the first section area of ​​S7 are exactly the same as the weaving pitch and weaving distance set in the first section area of ​​S4, the weaving pitch and weaving distance set in the second section area of ​​S7 are exactly the same as the weaving pitch and weaving distance set in the second section area of ​​S4, and the weaving pitch and weaving distance set in the third section area of ​​S7 are exactly the same as the weaving pitch and weaving distance set in the third section area of ​​S4. The difference is that because the two cord layers of the air spring are symmetrically cross-arranged, when weaving the second layer of cord variable angle cord fabric 7, the spindle of the horizontal circular braiding machine should be replaced, and the spindle controlling the warp and the spindle controlling the weft should be swapped with each other, or the same weaving parameters should be preset on another horizontal circular braiding machine, but when the yarn-wrapped yarn tube is installed on the upper link of the horizontal circular braiding machine, it should be installed symmetrically with the first horizontal circular braiding machine, so that the woven cord variable angle air spring cord can be arranged symmetrically.

[0055] In S10, the preformed bladder skin is separated from the core shaft 1, the excess fibers not covered by the rubber are cut off, and the bladder skin is sent to a vulcanizing machine for vulcanization molding.

[0056] It should be noted that a layer of Chemlok402 adhesive needs to be pre-applied between the rubber layers and between the rubber and the fibers when weaving. This can significantly improve the adhesion between the different rubber layers and between the cord fibers and the rubber layers after vulcanization, thereby ensuring the quality of the bladder.

[0057] In this embodiment, the core shaft 1 of the horizontal annular braiding machine is made of metal.

[0058] In this embodiment, the thickness of the inner rubber layer 2 is 0.1 mm-5 mm.

[0059] In this embodiment, the thickness of the rubber 3 on the inner side of the first layer of variable angle cord ply fabric is 0.05mm-5mm; the thickness of the rubber 5 on the outer side of the first layer of variable angle cord ply fabric is 0.05mm-5mm; the thickness of the rubber 6 on the inner side of the second layer of variable angle cord ply fabric is 0.05mm-5mm; the thickness of the rubber 8 on the outer side of the second layer of variable angle cord ply fabric is 0.05mm-5mm.

[0060] In this embodiment, the thickness of the outer rubber layer 9 is 0.1-5 mm.

[0061] In this embodiment, the first layer of variable angle cord ply fabric 4 and the second layer of variable angle cord ply fabric 7 both include warp and weft, the density of the warp is 10-300 strands / dm, and the density of the weft is 1-20 strands / dm, wherein the warp and weft are two air spring cord fibers respectively.

[0062] In this embodiment, the axial angle between the warp and the horizontal annular braiding machine core shaft 1 is 0-75 degrees; the axial angle between the weft and the horizontal annular braiding machine core shaft 1 is 0-75 degrees. It should be added that the realization principle of the first layer of cord variable angle cord layer fabric 4 and the second layer of cord variable angle cord layer fabric 7 is to achieve the coverage area of ​​the fabric and the change of the angle between the warp and weft of the cord fabric by controlling the braiding distance and pitch parameters of the horizontal annular braiding machine.

[0063] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel cord variable angle air spring bladder, comprising an inner rubber layer (2), an outer rubber layer (9), and a cord layer disposed between the inner rubber layer (2) and the outer rubber layer (9), characterized in that: The cord layer comprises a first layer of cord variable angle cord layer fabric inner rubber (3), a first layer of cord variable angle cord layer fabric (4), a first layer of cord variable angle cord layer fabric outer rubber (5), a second layer of cord variable angle cord layer fabric inner rubber (6), a second layer of cord variable angle cord layer fabric (7), and a second layer of cord variable angle cord layer fabric outer rubber (8), which are sequentially arranged from the inside to the outside; the inner layer rubber (2) is bonded to the first layer of cord variable angle cord layer fabric inner rubber (3); and the outer layer rubber (9) is bonded to the second layer of cord variable angle cord layer fabric outer rubber (8).

2. A novel method for manufacturing a variable-angle air spring bladder, characterized in that: The invention comprises a novel cord variable angle air spring bag skin as described in claim 1, and the manufacturing method is as follows: S1, two air spring cord fibers are installed on a horizontal circular braiding machine through a yarn tube, and a core shaft (1) of a predetermined size and shape is installed on the horizontal circular braiding machine; S2, cutting the inner rubber layer (2) into a specific size, wrapping it on the core shaft (1) of the horizontal circular braiding machine, and completely wrapping the core shaft (1); S3, cutting the first layer of variable angle cord ply fabric inner rubber (3) of a specific size, and wrapping it on the mandrel (1) formed in S2, so that it completely overlaps with the inner layer rubber (2) and completely wraps the mandrel (1) formed in S2; S4, the air spring cord fibers are woven by a horizontal circular braiding machine to form a first layer of cord variable angle cord fabric (4), and the first layer is woven on the core shaft (1) formed in S3, and the core shaft (1) formed in S3 is completely wrapped; S5, cutting the outer rubber (5) of the first layer of variable angle cord ply fabric into a specific size, and wrapping it on the mandrel (1) formed in S4, so that it completely overlaps with the inner rubber (3) of the first layer of variable angle cord ply fabric, and completely wraps the mandrel (1) formed in S4; S6, cutting the inner rubber (6) of the second layer of variable angle cord ply fabric into a specific size, and wrapping it on the mandrel (1) formed in S5, so that it completely overlaps with the outer rubber (8) of the second layer of variable angle cord ply fabric, and completely wraps the mandrel (1) formed in S5; S7, the air spring cord fibers are woven by a horizontal circular braiding machine to form a second layer of cord variable angle cord fabric (7), and the second layer is woven on the core shaft (1) formed in S6, and the core shaft (1) formed in S6 is completely wrapped; S8, cutting the outer rubber (8) of the second layer of variable angle cord ply fabric into a specific size, and wrapping it on the core shaft (1) formed in S7, so that it completely overlaps with the inner rubber (6) of the second layer of variable angle cord ply fabric, and completely covers the second layer of variable angle cord ply fabric (7), and completely wraps the core shaft (1) formed in S7; S9, cutting the outer rubber (9) of a specific size, and wrapping it on the core shaft (1) formed in S8, so that it completely overlaps with the outer rubber (8) of the second layer of the variable angle cord layer fabric, and completely wraps the core shaft (1) formed in step S8 to form a preformed bladder skin; S10, separating the preformed bladder skin formed in S9 from the core shaft (1), and vulcanizing and forming the bladder skin.

3. The method for manufacturing a novel variable-angle air spring bag skin according to claim 2 is characterized in that: The core shaft (1) of the horizontal annular braiding machine is made of metal.

4. The method for manufacturing a novel variable-angle air spring bag skin according to claim 2 is characterized in that: The thickness of the inner rubber layer (2) is 0.1 mm-5 mm.

5. The method for manufacturing a novel variable-angle air spring bag skin according to claim 2 is characterized in that: The thickness of the rubber (3) on the inner side of the first layer of variable angle cord ply fabric is 0.05 mm to 5 mm; The thickness of the outer rubber (5) of the first layer of variable angle cord ply fabric is 0.05 mm to 5 mm; The thickness of the rubber (6) on the inner side of the second layer of variable angle cord ply fabric is 0.05 mm to 5 mm; The thickness of the outer rubber (8) of the second layer of variable angle cord ply fabric is 0.05 mm to 5 mm.

6. The method for manufacturing a novel variable-angle air spring bladder according to claim 2 is characterized in that: The thickness of the outer rubber layer (9) is 0.1-5 mm.

7. The method for manufacturing a novel variable-angle air spring bag skin according to claim 2 is characterized in that: The fiber materials of the first layer of variable-angle cord ply fabric (4) and the second layer of variable-angle cord ply fabric (7) are both nylon fibers or aramid fibers impregnated with RFL.

8. The method for manufacturing a novel variable-angle air spring bag skin according to claim 2 is characterized in that: The first layer of variable-angle cord ply fabric (4) and the second layer of variable-angle cord ply fabric (7) both comprise warp threads and weft threads; the density of the warp threads is 10-300 threads / dm; and the density of the weft threads is 1-20 threads / dm.

9. The method for manufacturing a novel variable-angle air spring bag skin according to claim 8, characterized in that: The axial angle between the warp and the core shaft (1) of the horizontal annular braiding machine is 0-75 degrees; the axial angle between the weft and the core shaft (1) of the horizontal annular braiding machine is 0-75 degrees.

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