Manufacturing method of high-temperature-resistant aramid magic tape

Abstract

The invention relates to the technical field of magic tape production, discloses a manufacturing method of a high-temperature-resistant aramid magic tape, and solves the technical problems that an existing polyester and PPS magic tape is narrow in temperature-resistant range, easy to melt and carbonize at high temperature and easy to embrittle at low temperature. According to the method, a finished product is prepared through raw material preparation, respective twisting, high-temperature shaping, semi-finished product weaving and hook hair surface fine processing. Newly-synthesized aramid 1414 yarns, 316L metal fiber yarns and wool surface pure aramid 1414 are selected as raw materials for weaving, the wool surface pure aramid 1414 and the hook surface pure aramid 1414 are subjected to mixed weaving, after the raw materials are shaped into filaments with specific linear density, a blank belt is woven according to matching of warp and weft surface yarns, and then the blank belt is treated through the procedures of cleaning, coating shaping, hook cutting and the like. The finished product can be continuously used at-196-204 DEG C, has excellent mechanical strength, fire resistance and corrosion resistance, is suitable for the existing equipment in process, is easy to implement, is suitable for industrial production, and can be applied to the fields with high performance requirements, such as aerospace and chemical industry.

Description

Technical Field

[0001] This invention belongs to the field of hook and loop fastener (Velcro) production technology, specifically relating to a method for manufacturing a high-temperature resistant aramid hook and loop fastener. Background Technology

[0002] In existing technologies, hook and loop fasteners (Vessel fasteners) mainly include the following types: 1. Flame-retardant hook and loop fasteners made from polyester filament, nylon filament, or a combination of polyester filament will melt upon contact with an open flame, accompanied by black smoke and a pungent odor; they soften at 180℃ and melt at 260℃, failing to meet temperature resistance requirements. Furthermore, they harden and become brittle in sub-zero temperatures, making them extremely prone to breakage. Therefore, they do not meet the requirements.

[0003] 2. Existing PPS long-filament hook and loop fasteners have insufficient temperature resistance. At around 160℃, the adhesive is still applied, and at high temperatures, it will catch fire and carbonize, so it cannot be used in ultra-high temperature environments; it also cannot be used normally in low temperature environments above -40℃.

[0004] Therefore, it is of great significance to develop aramid hook and loop fasteners (Velcro) with better quality that can withstand lower or higher temperature environments. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this invention provides a method for manufacturing high-temperature aramid hook and loop fasteners that is easy to implement, has good high-temperature resistance and corrosion resistance.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: a method for manufacturing high-temperature resistant aramid hook and loop fasteners, comprising the following steps: S1. Preparation of raw materials for the wire; S2, twisting; S3, High-temperature setting; S4. Preparation of semi-finished hook and loop fasteners; S5. A series of processing steps are performed on the hook side and the rough side to finally obtain the finished hook and loop fastener.

[0007] Furthermore, the raw materials for the thread in step S1 are new synthetic aramid 1414 yarn and 316L metal fiber yarn, wherein the hook and loop fastener uses only new synthetic aramid 1414 yarn for the loop side, and the hook and loop fastener uses a blend of new synthetic aramid 1414 yarn and 316L metal fiber yarn for the hook and loop fastener hook side.

[0008] Furthermore, in step S2, the threads used for the hook and loop sides of the hook and loop fastener are twisted separately.

[0009] Furthermore, in step S3, the two twisted wires are subjected to high-temperature setting to produce new synthetic aramid 1414 filaments with linear densities of 100D-400D, 150D-500D, and 300-500D, respectively, and 316L metal filaments with linear densities of 300-500D.

[0010] Furthermore, the preparation of hook and loop fastener semi-finished products in step S4 includes a rough surface semi-finished product and a hook surface semi-finished product; The semi-finished fabric is made by weaving 100D-400D filament as warp yarn, 150D-500D filament as weft yarn and 300-500D filament of new synthetic aramid 1414 material as face yarn in a ribbon loom. The hook-face semi-finished product is made by weaving 100D-400D filament as warp yarn, 150D-500D filament as weft yarn and 300-500D filament of 316L metal material as face yarn in a ribbon loom.

[0011] Furthermore, step S5 includes the following sub-steps: S5-1. Clean and degrease the rough-surface and hook-surface blanks; S5-2. First, coat and shape the rough-surface blank belt and hook-surface belt, and then dry and shape them at 100-160℃. S5-3. The hook-faced strip is cut into hooks with openings; the rough-faced strip is packaged directly after shaping.

[0012] Furthermore, in step S4, the reserved height of the rough surface of the semi-finished product is 2.2-2.8mm; the reserved height of the hook surface of the semi-finished product is 1.6-2.4mm; the peel strength is ≥3N / CM², and the tensile strength is ≥16N / CM.

[0013] By adopting the above technical solution, compared with the prior art, the present invention has the following technical effects: Compared with existing technologies, it has the following significant technical advantages: (1) Excellent temperature resistance over a wide temperature range: The hook and loop fasteners can be used continuously in an ultra-wide temperature range of -196℃ to 204℃. They will not burn or melt below 450℃. Tests have shown that they can continue to work normally in an environment of 350℃. They meet the requirements for ultra-high temperature use and completely solve the technical defects of traditional polyester / nylon hook and loop fasteners that soften at 180℃ and melt at 260℃, as well as the insufficient temperature resistance of PPS filament hook and loop fasteners at 160℃. They do not harden or become brittle or break easily in low temperature environments. They also meet fire protection standards such as FAR / EASACS25-853, ABS1300, and FMVSS-302. They do not burn or drip when exposed to open flames, and there is no black smoke or pungent odor.

[0014] (2) High mechanical strength and good stability: Through the differentiated raw material combination and structural parameter design of the rough surface and hook surface, the peel strength of the finished product is ≥3N / CM², the tensile strength is ≥16N / CM, the breaking strength is ≥300N, and after 50 cycles of use, the transverse tensile strength is still ≥9N / cm² and the longitudinal peel strength is ≥1.2N / cm. The mechanical properties are far superior to the existing hook and loop fasteners, and the hook surface and rough surface are tightly engaged, maintaining good connection performance in high and low temperature alternating environments.

[0015] (3) Excellent corrosion resistance: The hook surface is made of aramid 1414 and 316L metal fiber blend design. Relying on the excellent acid and alkali resistance and salt spray resistance of 316L metal fiber, combined with the chemical stability of aramid 1414 itself, the finished product has good corrosion resistance and wear resistance, which solves the problem of traditional hook and loop fasteners being easily corroded and having a short service life. It can adapt to the complex corrosive application environment such as chemical, marine, and aerospace industries.

[0016] (4) Excellent compatibility between raw materials and processes: The nap is made of new synthetic aramid 1414 yarn to ensure softness and bite compatibility. The hook is made of mixed weaving design to improve structural hardness and high temperature resistance. At the same time, through the process design of twisting the nap and hook yarns separately and setting them at high temperature, the material properties of aramid 1414 and 316L metal fiber are effectively preserved, avoiding fiber performance loss caused by mixed twisting and mixed setting. The linear density of warp yarn, weft yarn and face yarn is accurately matched, which further improves the weaving stability of the fabric and the mechanical properties of the finished product.

[0017] (5) The process is easy to implement and suitable for industrial production: The production steps of this invention are clear and all processing techniques can be adapted to existing webbing production equipment without large-scale equipment modification. Moreover, the parameters of each process are clear and highly controllable, which can effectively reduce the defect rate. At the same time, the raw material combination has been optimized, and the amount of metal fiber used is controlled while ensuring performance. It takes into account both production efficiency and raw material cost, and has good prospects for large-scale industrial production.

[0018] (6) Reasonable finished product structure design: Through the differentiated design of 2.2-2.8mm reserved height on the rough surface and 1.6-2.4mm reserved height on the hook surface, the hook surface and the rough surface are accurately engaged, which solves the problem of insufficient adhesion and easy fall-off caused by unreasonable height design of traditional hook and loop fasteners. The finished product has high precision in thickness and width dimensions, which meets the requirements of industrialized and standardized production. Detailed Implementation

[0019] The following examples provide a further detailed description of the implementation methods of the present invention.

[0020] The method for manufacturing high-temperature resistant aramid hook and loop fasteners of the present invention includes the following steps: S1. Preparation of raw materials for the wire; S2, twisting; S3, High-temperature setting; S4. Preparation of semi-finished hook and loop fasteners; S5. A series of processing steps are performed on the hook side and the rough side to finally obtain the finished hook and loop fastener.

[0021] The raw materials for the thread in step S1 are new synthetic aramid 1414 yarn and 316L metal fiber yarn. The hook and loop fastener uses only new synthetic aramid 1414 yarn for the loop side, while the hook side uses a blend of new synthetic aramid 1414 yarn and 316L metal fiber yarn.

[0022] In step S2, the yarn used for the hook and loop sides of the hook and loop fastener is twisted separately.

[0023] Step S3 involves high-temperature setting of the two twisted wires to produce new synthetic aramid 1414 filaments with linear densities of 100D-400D, 150D-500D, and 300-500D, respectively, and 316L metal filaments with linear densities of 300-500D.

[0024] Step S4 involves the preparation of hook and loop fastener semi-finished products, including the rough-surface semi-finished product and the hook-surface semi-finished product. The semi-finished fabric is made by weaving 100D-400D filament as warp yarn, 150D-500D filament as weft yarn and 300-500D filament of new synthetic aramid 1414 material as face yarn in a ribbon loom. The hook-face semi-finished product is made by weaving 100D-400D filament as warp yarn, 150D-500D filament as weft yarn and 300-500D filament of 316L metal material as face yarn in a ribbon loom.

[0025] Step S5 includes the following sub-steps: S5-1. Clean and degrease the rough-surface and hook-surface blanks; S5-2. First, coat and shape the rough-surface blank belt and hook-surface belt, and then dry and shape them at 100-160℃. S5-3. The hook-faced strip is cut into hooks with openings; the rough-faced strip is packaged directly after shaping.

[0026] The finished hook and loop fasteners were tested for performance using conventional methods, and the results are shown in the table below:

[0027] The above embodiments illustrate the basic principles and features of the present invention, but are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present invention. Therefore, the scope of this patent and its protection should be determined by the appended claims.

Claims

1. A method for manufacturing a high-temperature resistant aramid hook and loop fastener, characterized in that: Includes the following steps: S1. Preparation of raw materials for the wire; S2, twisting; S3, High-temperature setting; S4. Preparation of semi-finished hook and loop fasteners; S5. A series of processing steps are performed on the hook side and the rough side to finally obtain the finished hook and loop fastener.

2. The method for manufacturing high-temperature resistant aramid hook and loop fasteners according to claim 1, characterized in that: The raw materials for the thread in step S1 are new synthetic aramid 1414 yarn and 316L metal fiber yarn. The hook and loop fastener uses only new synthetic aramid 1414 yarn for the loop side, while the hook side uses a blend of new synthetic aramid 1414 yarn and 316L metal fiber yarn.

3. The method for manufacturing high-temperature resistant aramid hook and loop fasteners according to claim 2, characterized in that: In step S2, the yarn used for the hook and loop sides of the hook and loop fastener is twisted separately.

4. The method for manufacturing high-temperature resistant aramid hook and loop fasteners according to claim 3, characterized in that: Step S3 involves high-temperature setting of the two twisted wires to produce new synthetic aramid 1414 filaments with linear densities of 100D-400D, 150D-500D, and 300-500D, respectively, and 316L metal filaments with linear densities of 300-500D.

5. The method for manufacturing high-temperature resistant aramid hook and loop fasteners according to claim 4, characterized in that: Step S4 involves the preparation of hook and loop fastener semi-finished products, including the rough-surface semi-finished product and the hook-surface semi-finished product. The semi-finished fabric is made by weaving 100D-400D filament as warp yarn, 150D-500D filament as weft yarn and 300-500D filament of new synthetic aramid 1414 material as face yarn in a ribbon loom. The hook-face semi-finished product is made by weaving 100D-400D filament as warp yarn, 150D-500D filament as weft yarn and 300-500D filament of 316L metal material as face yarn in a ribbon loom.

6. The method for manufacturing high-temperature resistant aramid hook and loop fasteners according to claim 5, characterized in that: Step S5 includes the following sub-steps: S5-1. Clean and degrease the rough-surface and hook-surface blanks; S5-2. First, coat and shape the rough-surface blank belt and hook-surface belt, and then dry and shape them at 100-160℃. S5-3. The hook-faced strip is cut into hooks with openings; the rough-faced strip is packaged directly after shaping.

7. The method for manufacturing high-temperature resistant aramid hook and loop fasteners according to claim 6, characterized in that: In step S4, the reserved height of the rough surface of the semi-finished product is 2.2-2.8mm; the reserved height of the hook surface of the semi-finished product is 1.6-2.4mm; the peel strength is ≥3N / CM², and the tensile strength is ≥16N / CM.

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