Aramid cloth, preparation method thereof and aramid conveyor belt

Abstract

The present invention provides an aramid cloth comprising an aramid portion and a polyester portion; wherein the width ratio of the aramid portion to the polyester portion is 3 to 5:1; and the two pieces of aramid cloth are joined by a step-lap joint. The present invention utilizes the aramid cloth design to implement a step-lap joint method for conveyor belts, utilizing inexpensive polyester as filler, significantly reducing the material cost of the aramid cloth. Compared to conventional tooth-shaped joints, the step-lap joint achieves a theoretical step strength of 100%, and compared to the 70% strength of tooth-shaped joints, the joint strength utilization rate can be increased by 30%, thereby reducing the design strength of the aramid cloth and saving material costs. The step-lap joint method facilitates operation and enhances joint safety.

Description

Technical Field

[0001] The present invention relates to the field of rubber technology, in particular to an aramid cloth, a preparation method thereof and an aramid conveyor belt. Background Art

[0002] Aramid fiber, an emerging material, is gradually being used in conveyor belts due to its low density, high strength, high modulus, low elongation, low creep rate, and excellent thermal stability. Conveyor belts made with aramid as the backbone exhibit excellent impact and tear resistance, stable operation, low elongation, light weight, and good troughing properties. Compared to steel cord conveyor belts, aramid fiber effectively addresses the issues of poor tear resistance, poor water and corrosion resistance, and poor bending fatigue resistance. Compared to similar steel cord conveyor belts, aramid fiber is 35-45% lighter, effectively reducing conveyor energy consumption. Aramid conveyor belts are energy-saving conveyor belts with promising development prospects.

[0003] Despite the numerous advantages of aramid conveyor belts, their weakest link is low joint strength, a significant barrier to widespread adoption. Aramid fabric used in conveyor belts is typically single-layer, and currently joints are typically made using a toothed vulcanization method. This results in joint strength reaching only approximately 70% of the belt's overall strength. Therefore, to achieve joint strength that meets standard requirements, the aramid fabric's tensile strength must be increased, resulting in significant waste. For example, DPP2000 aramid fabric has a nominal strength of ≥2000 N / mm, but to meet this joint strength requirement, the actual manufacturing strength reaches 2857 N / mm. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide an aramid cloth. The aramid cloth overlapping method provided by the present invention can improve the joint efficiency, improve the joint strength, and save aramid materials.

[0005] The invention provides an aramid cloth comprising an aramid part and a polyester part; wherein the width ratio of the aramid part to the polyester part is 3-5:1; and the joint mode between the two pieces of aramid cloth is step overlap.

[0006] Preferably, the step-joining is specifically:

[0007] Between the aramid cloths, according to the principle of step complementarity, the excess aramid cloth is cut off, and the polyester of one aramid cloth is placed adjacent to the aramid of another aramid cloth.

[0008] Preferably, the number of steps of the step-joint is 4.

[0009] Preferably, in the aramid cloth, the width ratio of aramid to polyester is 4:1.

[0010] Preferably, the height of each step in the step overlap is 8 to 12 cm, and the length is 20 cm.

[0011] The present invention provides a method for preparing aramid cloth, comprising:

[0012] Prepare warp and weft yarns according to the calculated strength of the aramid cloth; the calculated strength of the aramid cloth is specifically: design strength * 1.25 / joint strength percentage;

[0013] Aramid filament and polyester are used as warp yarns, and nylon is used as weft yarns; the warp yarns and weft yarns are twisted and ply-plied;

[0014] The aramid and polyester are woven into cloth using a straight warp and weft structure according to the width, and then the cloth is dipped in glue and shaped to obtain the initial aramid cloth;

[0015] The initial aramid cloth is overlapped in a step-lapping manner, and then coated with core rubber and cover rubber, and vulcanized to obtain the aramid cloth.

[0016] Preferably, the weft threads of the aramid cloth woven with a straight warp and straight weft structure are located above and below the warps, and their relative positions are fixed by connecting the warps up and down and crossing them.

[0017] Preferably, the linear density of nylon is 1870 dtex; the linear density of aramid filament is 3300 dtex, and the density is 42 strands / 10 cm; the linear density of polyester is 1870 dtex, and the density is 84 strands / 10 cm; the weft yarn density is 34 strands / 10 cm; and the twist and twist direction are 150-160S / 110-120Z twists / m.

[0018] Preferably, the joint strength percentage is specifically: the aramid cloth prepared in advance according to the method of the present invention is jointed and its joint strength is measured.

[0019] The present invention provides an aramid conveyor belt, characterized in that it comprises the aramid cloth described in any one of the above technical solutions, or the aramid cloth prepared by the preparation method described in any one of the above technical solutions.

[0020] Compared to the prior art, the present invention provides an aramid cloth comprising an aramid portion and a polyester portion; the width ratio of the aramid portion to the polyester portion is 3 to 5:1; and the two pieces of aramid cloth are joined using a step-lap joint. Through the design of the aramid cloth, the present invention enables a step-lap joint method for conveyor belts, utilizing inexpensive polyester as filler, significantly reducing the material cost of the aramid cloth. Compared to traditional tooth-shaped joints, the step-lap joint achieves a theoretical step strength of 100%, and compared to the 70% strength of tooth-shaped joints, it increases the joint strength utilization rate by 30%, thereby reducing the design strength of the aramid cloth and saving material costs. The step-lap joint method facilitates operation and increases the safety of the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-stage aramid cloth described in Comparative Example 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of a three-stage aramid conveyor belt joint according to Comparative Example 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the 4-stage aramid cloth described in Example 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of a 4-stage aramid conveyor belt joint according to Example 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the fifth-order aramid cloth according to Example 2 of the present invention;

[0026] Figure 6 This is a schematic diagram of the fifth-order aramid conveyor belt joint described in Example 2 of the present invention. DETAILED DESCRIPTION

[0027] The present invention provides an aramid cloth, a method for preparing the same, and an aramid conveyor belt. Those skilled in the art may refer to the disclosure herein and appropriately modify the process parameters to achieve the desired results. It is particularly important to note that all similar substitutions and modifications will be readily apparent to those skilled in the art and fall within the scope of protection of the present invention. The methods and applications of the present invention have been described using preferred embodiments. It is obvious that those skilled in the art will be able to modify, alter, and combine the methods and applications herein to implement and apply the technology of the present invention without departing from the content, spirit, and scope of the present invention.

[0028] The invention provides an aramid cloth comprising an aramid part and a polyester part; wherein the width ratio of the aramid part to the polyester part is 3-5:1; and the joint mode between the two pieces of aramid cloth is step overlap.

[0029] Aramid is the skeleton material of the conveyor belt cloth, and polyester (or other similar materials such as nylon) is the filling material.

[0030] The aramid cloth provided by the present invention comprises an aramid portion and a polyester portion, wherein the width ratio of the aramid portion to the polyester portion is 3 to 5:1, preferably 3:1, 4:1 or 5:1, and more preferably 4:1.

[0031] The aramid fabric of the present invention is woven using aramid and polyester. Aramid costs 200 yuan / kg, while polyester costs 13 yuan / kg. Therefore, this design uses a segmented production method (partial polyester replaces aramid according to a certain width). The polyester serves as a filler, reserving space for the stepped overlap.

[0032] The joint mode between the two pieces of aramid cloth of the present invention is step overlap.

[0033] The step overlap is specifically as follows:

[0034] Between the aramid cloths, according to the principle of step complementarity, the excess aramid cloth is cut off, and the polyester of one aramid cloth is placed adjacent to the aramid of another aramid cloth.

[0035] According to the present invention, each step in the step overlap has a height of 8 to 12 cm and a length of 20 cm. The step overlap is generally a three-step overlap, but can also be a four- to six-step overlap. Taking a three-step overlap as an example, each step is designed to be approximately 10 mm wide. This 10 mm width contains a certain number of aramid cords. The diameter (width) of the aramid cords varies depending on the type of aramid fabric. For example, for DPP2000 aramid fabric, assuming a single cord is 3.5 mm wide, the design width of each step is 3.5*3 = 10.5 mm. Therefore, the width of a group of aramid cords is 10.5*3 = 31.5 mm. The width of a group of polyester cords is designed to be 10.5-12 mm (the width of the polyester cords should be slightly larger than the width of a single group of aramid cords, approximately 1 mm) to ensure sufficient space for arrangement during splicing. Assuming the design width is 11 mm, the width of the complete group of aramid cords + polyester cords is 31.5 + 11 = 42.5 mm.

[0036] The number of steps of the step overlap described in the present invention is preferably 4.

[0037] The strength of aramid fabric is measured based on aramid, and the step overlap of the joint is generally 3-5 steps. When the step overlap is 3 steps, aramid is used for the third step and polyester is used for the first step, resulting in an aramid ratio of 3 / 4 (75%). When the step overlap is 4 steps, aramid is used for the fourth step and polyester is used for the first step, resulting in an aramid ratio of 4 / 5 (80%). When the step overlap is 5 steps, aramid is used for the fifth step and polyester is used for the first step, resulting in an aramid ratio of 5 / 6 (83.3%).

[0038] The joint is designed as a stepped overlap method, which ensures that each step has a corresponding strong connection. The theoretical value of the joint strength utilization rate of this stepped method can reach 100%.

[0039] The present invention provides a method for preparing aramid cloth, comprising:

[0040] Prepare warp and weft yarns according to the calculated strength of the aramid cloth; the calculated strength of the aramid cloth is specifically: design strength * 1.25 / joint strength percentage;

[0041] Aramid filament and polyester are used as warp yarns, and nylon is used as weft yarns; the warp yarns and weft yarns are twisted and ply-plied;

[0042] The aramid and polyester are woven into cloth using a straight warp and weft structure according to the width, and then the cloth is dipped in glue and shaped to obtain the initial aramid cloth;

[0043] The initial aramid cloth is overlapped in a step-over manner, and then coated with core rubber and cover rubber, and vulcanized to obtain the aramid cloth.

[0044] The present invention provides a method for preparing aramid cloth, which first prepares warp yarns and weft yarns according to the calculated strength of the aramid cloth; the calculated strength of the aramid cloth is specifically: design strength*1.25 / joint strength percentage.

[0045] The joint strength percentage is specifically: the aramid cloth prepared in advance according to the method of the present invention is jointed and its joint strength is measured.

[0046] First, the overall fabric strength is calculated based on aramid as the skeleton material. Using a four-step lap design, each aramid fabric group consists of 4 / 5 aramid and 1 / 5 polyester. Aramid accounts for 80% of the total aramid fabric width. Given a fixed nominal belt strength, the aramid strength should be designed as if aramid accounts for 80% of the total aramid fabric. For example, for DPP2000 aramid fabric, to achieve an overall aramid strength of 2000 N / mm, the aramid strength should be designed to be 2200 * 5 / 4 = 2500 N / mm. Testing has shown that the aramid fabric joint strength produced in this manner reaches approximately 89% of the overall belt strength. To maintain the strength of the DPP2000, the aramid strength should be designed to be: 2000 * 5 / 4 * 100 / 89 = 2809 N / mm.

[0047] Aramid filament and polyester are used as warp yarns, and nylon is used as weft yarns; the warp yarns and weft yarns are twisted and plied.

[0048] Aramid and polyester yarns are twisted and plied according to the designed strength. For example, with a four-step lapping, aramid filaments and some polyester yarns are used as warp yarns, while nylon yarns are used as weft yarns. Both the warp and weft yarns are twisted.

[0049] The nylon linear density of the present invention is 1870 dtex; the linear density of the aramid filament is 3300 dtex, with a density of 42 yarns / 10 cm; the linear density of the polyester is 1870 dtex, with a density of 84 yarns / 10 cm; the weft yarn density is 34 yarns / 10 cm; the twist and twist direction are 150-160S / 110-120Z twists / m (S is clockwise and Z is counterclockwise).

[0050] Aramid and polyester are woven into cloth using a straight warp and weft structure according to the width.

[0051] The weft threads of the aramid cloth woven with a straight warp and straight weft structure of the present invention are located above and below the warps, and their relative positions are fixed by connecting the warps up and down and crossing them.

[0052] Aramid fabric woven with straight warp and weft can achieve a higher fabric density. After the fibers are woven into the fabric, the strength retention rate is over 90%. The conveyor belt made from it is not easily stretched when subjected to tension.

[0053] Then it is dipped in glue and shaped to obtain the initial aramid cloth.

[0054] The process of dipping the aramid tape in the normal process is to prepare the adhesive slurry in advance, and then the aramid tape is dipped in the adhesive slurry and then subjected to a shaping process. The present invention does not limit the process, and it is well known to those skilled in the art.

[0055] The initial aramid cloth is overlapped in a step-lapping manner, and then coated with core rubber and cover rubber, and vulcanized to obtain the aramid cloth.

[0056] First, you need to have a necessary understanding of the conveyor belt to be jointed: the grade, width, thickness, thickness of the film, etc., and prepare the corresponding specifications of the film, glue (glue thickness is 1.5-2.0mm), adhesive (must be prepared with a special joint glue formula for aramid belts), impregnated mesh cloth (preferably the impregnated mesh cloth in Table 2. Or use an impregnated mesh cloth with a mesh spacing of 4±0.5mm and a gram weight of not less than 300 grams), release paper, iron pads, etc. according to the measurement results.

[0057] After the tape vulcanization preparation is completed, the vulcanizing machine can be installed:

[0058] Arrange the lower crossbeams of the machine frame in a straight line with uniform spacing; position the thin-walled hydraulic pressure plate in the center of the lower crossbeam; place the insulation plate on the hydraulic pressure plate; and place the heating plate, ensuring the heated surface faces upward. Place the cooling plate alongside the heating plate; place the vulcanized tape on the heating plate; and place shims on either side of the tape. Use the clamping device to secure the two shims, and use the handle to rotate the screw until the steel clamps substantially tighten the vulcanized tape. For vulcanization joints larger than 800mm, use two machines for joint vulcanization. Place a 0.5mm x 1000mm long (the same length as the tape width) piece of galvanized iron and silicone-coated paper at the junction of the two lower heating plates. Place the upper heating plate, ensuring the heated surface faces downward and the cable outlet is aligned with the lower plate. For joint vulcanization, place a 0.5mm x 1000mm long (the same length as the tape width) piece of galvanized iron and silicone-coated paper at the junction of the two lower heating plates. Place the cooling plate and insulation plate on the upper heating plate. Place the upper crossbeam so that it aligns vertically and horizontally with the lower crossbeam. Install the M38 screws and nuts, ensuring the nuts are tightened to the same degree. Install a manual (electric) hydraulic pump and connect the high-pressure water pipe. Plug the other end of the quick-connect connector directly into the water pressure plate water inlet. Connect the water pressure plate cooling pipe to ensure smooth water flow to and from each plate.

[0059] The connector of the present invention is preferably made according to the following method:

[0060] Firstly, the production of step joints. Determination of joint parameters

[0061] Table 1

[0062] Strength specifications Finger width bf Minimum finger length lf 2000S 60 200

[0063] When the step width is 60mm, when the standard bandwidth divided by 60 is an odd number (such as bandwidth 800, 1000, 1400, 1600mm), the center line of the belt in the running direction is on the center line of one step of the belt; when the standard bandwidth divided by 60 is an even number (bandwidth 1200), the center line of the belt in the running direction is between two steps of the belt.

[0064] Then, cut the steps. Specifically, use a cutting knife or utility knife to cut the steps. When cutting the steps, place the cutting knife positioning plate under the belt body with the head facing outward, and pay attention to using the groove combination method to cut the teeth; cut continuously until all the teeth are cut.

[0065] Next comes surface treatment. Use an electric planer or knife to remove the rubber layer from the cut steps, maintaining a thickness of approximately 0.5mm from the rubber layer to the fabric. The depth should not damage the fabric material. Lightly polish the surface with an electric brush, avoiding concentrating on one area to prevent heat damage to the covering rubber. Be careful not to leak fabric and avoid damaging the fabric material.

[0066] Use gasoline to clean the stains on the surface and set aside.

[0067] Then for positioning, specifically: place the cut steps on the vulcanized plate;

[0068] Lay the two belt heads flat, find two center points on each belt head, and place the two belt heads on the same center line based on the four center points;

[0069] Align, and then use fixed strips to fix the belt body at both ends of the flat plate.

[0070] Applying: Place release paper, cover tape, mesh cloth, and adhesive tape under the belt in sequence, aligning the edges of the tape with the cut edges. Clean the stepped surface with gasoline and apply adhesive. Avoid applying too much adhesive, applying a uniform coat, like a coat of paint. Allow to dry and lay the tape flat in a sequence. Fill gaps exceeding 5mm with adhesive strips. Clean the top surface of the belt with gasoline. Allow to dry and place adhesive tape, mesh cloth, and cover tape (optionally pre-formed) on the belt in sequence, aligning the tape with the cut edges. Place rubber strips on the edges and compact them firmly. Apply a moderate amount of adhesive to the edges and the transverse joints between the tape and the belt to facilitate adhesion. After laying the release paper flat, place the work pad, vulcanized plate, and crossbeams, and assemble the equipment. After assembly, apply even pressure to each nut, maintaining consistent pressure across the crossbeams.

[0071] Finally, pressurize and vulcanize. To do this: First, connect the power input to the heating plate. Then, connect the power cord, ground wire, and all thermocouple connections before applying power. Once the temperature reaches 70-80°C, tighten the nuts again. When the temperature reaches 100°C, begin pressurizing to the required process pressure. Once the temperature reaches the required level, maintain the temperature and pressure. Check the temperature and pressure frequently during this period and adjust them to the process range. After vulcanization is complete, completely disconnect the power supply and allow water cooling. Once cooled to below 60°C, disassemble in the reverse order of installation.

[0072] After vulcanization is complete, release the pressure from the sides toward the center until it reaches zero. Disassemble the equipment in the reverse order of assembly. Reassemble the disassembled equipment components. Remove the power cord and pack all tools back into the tool box.

[0073] The specific vulcanization process of the present invention is shown in Table 2.

[0074] Table 2 Vulcanization joint process

[0075]

[0076] If cooling water is used, the process in Table 2 shall be executed; if natural cooling is used, the curing time shall be reduced by 5 minutes.

[0077] The present invention provides an aramid conveyor belt, characterized in that it comprises the aramid cloth described in any one of the above technical solutions, or the aramid cloth prepared by the preparation method described in any one of the above technical solutions.

[0078] The present invention provides an aramid cloth comprising an aramid portion and a polyester portion; wherein the width ratio of the aramid portion to the polyester portion is 3 to 5:1; and the two pieces of aramid cloth are joined by a step-lap joint. The present invention utilizes the aramid cloth design to implement a step-lap joint method for conveyor belts, utilizing inexpensive polyester as filler, significantly reducing the material cost of the aramid cloth. Compared to conventional tooth-shaped joints, the step-lap joint achieves a theoretical step strength of 100%, and compared to the 70% strength of tooth-shaped joints, the joint strength utilization rate can be increased by 30%, thereby reducing the design strength of the aramid cloth and saving material costs. The step-lap joint method facilitates operation and enhances joint safety.

[0079] In order to further illustrate the present invention, an aramid cloth, a preparation method thereof and an aramid conveyor belt provided by the present invention are described in detail below with reference to embodiments.

[0080] Comparative Example 1: Testing the joint strength of the aramid fabric using a 3-step overlap

[0081] The 3-step overlap method is used for design. In each set of aramid cloth, the width of aramid filaments in the warp accounts for 75% of the total width of each set of aramid cloth, and the width of polyester filaments accounts for 25% of the total width of each set of aramid cloth. Figure 1 As shown, Figure 1 This is a schematic diagram of the 3-stage aramid cloth described in Comparative Example 1 of the present invention. The joint method is the overlap method as shown in FIG. Figure 2 As shown, Figure 2 This is a schematic diagram of the 3-stage aramid conveyor belt joint described in Comparative Example 1 of the present invention.

[0082] Testing shows that the aramid fabric joint strength produced using this method reaches approximately 91% of the belt body joint strength. To maintain the strength of the DPP2000, the aramid fabric design strength should be: 2000 * 4 / 3 * 100 / 91 = 2931 N / mm. While this order improves joint efficiency, it also increases the aramid fabric design strength, without saving material costs.

[0083] Example 1: Testing the joint strength of the aramid fabric using a 4-step overlap

[0084] The design uses a 4-step overlap method. In each set of aramid cloth, the width of the aramid filaments in the warp accounts for 80% of the total width of each set of aramid cloth, and the width of the polyester filaments accounts for 20% of the total width of each set of aramid cloth. Taking DPP2000 aramid cloth as an example, in order to achieve an overall strength of 2000N / mm, the strength of the aramid is designed to be 2000*5 / 4=2500N / mm. The schematic diagram of the aramid cloth structure is shown below. Figure 3 As shown, Figure 3 Schematic diagram of the 4-stage aramid cloth according to Example 1 of the present invention; the joint method is the overlap method as shown in FIG. Figure 4 As shown; Figure 4 This is a schematic diagram of the 4-stage aramid conveyor belt joint described in Example 1 of the present invention.

[0085] Testing has shown that the aramid fabric joint strength achieved with this method can reach approximately 89% of the belt body joint strength. To maintain the strength of the DPP2000, the aramid fabric design strength should be: 2000 * 5 / 4 * 100 / 89 = 2809 N / mm. This order improves joint efficiency, while the aramid fabric design strength is lower than that of a toothed joint, saving material costs.

[0086] Example 2: Testing the joint strength of the aramid fabric using a 5-step overlap

[0087] The design adopts a 5-step overlap method. In each set of aramid cloth, the width of the aramid filaments in the warp accounts for 83.3% of the total width of each set of aramid cloth, and the width of the polyester filaments accounts for 16.7% of the total width of each set of aramid cloth. Taking DPP2000 aramid cloth as an example, in order to achieve an overall strength of 2000N / mm, the strength of the aramid is designed to be 2000*6 / 5=2400N / mm. The schematic diagram of the aramid cloth structure is as follows Figure 5 As shown, Figure 5 Schematic diagram of the fifth-order aramid cloth according to Example 2 of the present invention; the joint method is the overlap method as shown in FIG. Figure 6 As shown, Figure 6 This is a schematic diagram of the fifth-order aramid conveyor belt joint described in Example 2 of the present invention.

[0088] Testing has shown that the aramid fabric joint strength achieved using this method is only approximately 88% of the belt body joint strength. To maintain the strength of the DPP2000, the aramid fabric should be designed with a strength of 2000*6 / 5*100 / 88 = 2727N / mm. This order improves joint efficiency, but the aramid fabric design strength is lower than that of a toothed joint, saving material costs.

[0089] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. Aramid cloth, characterized in that: include: Aramid part and polyester part; the width ratio of the aramid part to the polyester part is: 3~5:1; the joint method between the two pieces of aramid cloth is step overlap; The step overlap is specifically as follows: Between the aramid cloths, according to the principle of step complementarity, the excess aramid cloth is cut off, and the polyester of one aramid cloth is placed adjacent to the aramid of another aramid cloth; The number of steps of the step-joint is 4.

2. The aramid cloth according to claim 1, characterized in that: In the aramid cloth, the width ratio of aramid to polyester is 4:

1.

3. The aramid cloth according to claim 1, characterized in that: The height of each step in the step joint is 8-12 cm and the length is 20 cm.

4. A method for preparing the aramid cloth according to any one of claims 1 to 3, characterized in that: include: Prepare warp and weft yarns according to the calculated strength of the aramid cloth; the calculated strength of the aramid cloth is specifically: design strength * 1.25 / joint strength percentage; Aramid filament and polyester are used as warp yarns, and nylon is used as weft yarns; the warp yarns and weft yarns are twisted and ply-plied; The aramid and polyester are woven into cloth using a straight warp and weft structure according to the width, and then the cloth is dipped in glue and shaped to obtain the initial aramid cloth; The initial aramid cloth is overlapped in a step-lapping manner, and then coated with core rubber and cover rubber, and vulcanized to obtain the aramid cloth.

5. The preparation method according to claim 4, characterized in that The weft threads of the aramid cloth woven with a straight warp and straight weft structure are located above and below the warps, and the positions of the warps are fixed by connecting the warps up and down and crossing them.

6. The preparation method according to claim 4, characterized in that The linear density of nylon is 1870 dtex; the linear density of aramid filament is 3300 dtex, and the density is 42 strands / 10 cm; the linear density of polyester is 1870 dtex, and the density is 84 strands / 10 cm; the weft yarn density is 34 strands / 10 cm; the twist degree and twist direction of twisting are 150-160S / 110-120Z twists / m.

7. The preparation method according to claim 4, characterized in that The joint strength percentage is specifically: the aramid cloth prepared in advance according to the method of the present invention is jointed and its joint strength is measured.

8. An aramid conveyor belt, characterized in that: The invention comprises the aramid cloth according to any one of claims 1 to 3, or the aramid cloth prepared by the preparation method according to any one of claims 5 to 7.

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