Novel structure sewing thread and production method thereof

Abstract

The invention discloses a sewing thread with a novel structure and a production method thereof.The sewing thread comprises a first chemical fiber filament, a second chemical fiber filament and a skin-core chemical fiber filament, the second chemical fiber filament and the skin-core chemical fiber filament are in an irregular net shape, and the second chemical fiber filament is tightly twisted and wound on the first chemical fiber filament; the crossed contact positions of the skin-core chemical fiber filaments, the first chemical fiber filaments and the second chemical fiber filaments are hot-melted and bonded to form a cured structure; the production method comprises the steps that the first chemical fiber filaments are fed into an air nozzle through a first set of feeding wheels with the overfeeding rate being 6-8%, the second chemical fiber filaments and the skin-core chemical fiber filaments are fed into an air nozzle through a second set of feeding wheels with the overfeeding rate being 20-35%, air deformation treatment is carried out, and then twisting, dyeing, drafting heat setting, oiling and split charging are sequentially carried out. The problems that a traditional sewing thread is long in production process and insufficient in performance, and hairiness pollutes the environment are solved, and the multiple purposes of high performance, high efficiency and clean production are achieved.

Description

Technical Field

[0001] This invention relates to improvements in the field of sewing thread manufacturing, and more particularly to an improved invention of a novel structural sewing thread and its production method. Background Technology

[0002] In the current sewing thread manufacturing field, ring spinning of polyester sewing thread is widely used. This traditional technology has the following significant drawbacks: The production process is lengthy and complex, requiring more than 12 steps, including spinning, drafting, cutting, opening, carding, drawing, roving, spinning, self-winding, doubling, twisting, and dyeing. It consumes a lot of resources and has a long production cycle.

[0003] Product performance has shortcomings: poor strength uniformity: high breaking strength CV value (up to 5.5%), affecting sewing stability; Numerous yarn defects: The number of yarn defects per 100,000 meters is high (up to 39), affecting sewing quality and efficiency; The problem of fuzziness is serious: there are many long fuzzy fibers on the surface of the yarn, which are easy to fall off during the sewing process and form flying fluff. Work environment pollution: Shed feathers are inhaled by workers, posing a threat to their health and failing to meet clean production requirements.

[0004] Therefore, there is an urgent need to develop a new type of sewing thread structure with a simplified process, excellent performance (especially strength and uniformity), and improved working environment, as well as an efficient production method. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a new type of structural sewing thread and its production method.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This novel structural sewing thread includes a first chemical fiber filament and a second chemical fiber filament, wherein the first chemical fiber filament is a core filament and the second chemical fiber filament is a sheath filament. The thread is characterized by further including a sheath-core chemical fiber filament, which is a torque-adjusting filament. The second chemical fiber filament and the sheath-core chemical fiber filament are irregularly meshed and tightly twisted around the first chemical fiber filament. The sheath-core chemical fiber filament is heat-fused and bonded at the points where it intersects with the first and second chemical fiber filaments to form a solidified structure.

[0007] The first chemical fiber filament is a high-strength, low-elongation filament with a fineness of 50D-2500D and a breaking strength of 5-9CN / DTEX.

[0008] The second chemical fiber filament is a filament with ordinary strength and elongation, with a fineness of 75D-300D and a breaking strength of less than 5CN / DTEX.

[0009] The production method of the new structure sewing thread is characterized in that: the first chemical fiber filament adopts the first set of feeding wheels with an overfeed rate of 6-8%, the second chemical fiber filament and the core-sheath chemical fiber filament adopt the second set of feeding wheels with an overfeed rate of 20-35%, and are fed into the air nozzle together for air deformation treatment. After the air deformation treatment is completed, twisting, dyeing, stretching and heat setting, oiling and packaging are carried out in sequence.

[0010] The air deformation winding speed is 300-550 m / min, and the air pressure is 7-10 BAR.

[0011] The twisting degree is 250-600 twists / meter, and the spindle speed is 3000-5500 rpm.

[0012] The draw ratio for the heat setting process is 1-1.1, the draw speed is 50-200 m / min, and the draw temperature is 120-200 degrees Celsius.

[0013] The dyeing process involves heating at a rate of 1 degree Celsius per minute, maintaining the temperature at 120-130 degrees Celsius for 60 minutes, cooling to 80 degrees Celsius, and then performing reduction washing.

[0014] The beneficial effects of this invention are that the improved novel sewing thread structure and its production method utilize a core-sheath chemical fiber filament (torque adjusting filament) and a second chemical fiber filament, which are irregularly twisted and tightly wound on the core filament, and then heat-fused and bonded at the cross contact points to form a solidified structure, effectively locking the outer loops. The solidified structure greatly reduces the shedding of lint during sewing, avoids the generation of flying lint, significantly improves the production workshop and working environment, reduces the risk of workers inhaling harmful lint, achieves cleaner production, and effectively protects the health of workers. Attached Figure Description

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the single-line structure of the novel sewing thread of the present invention under a microscope.

[0017] Figure 2 This is a schematic diagram of the single-thread structure of existing ring-spun polyester sewing thread under a microscope. Detailed Implementation

[0018] The accompanying drawings illustrate the structure of the present invention, and further details will be described below in conjunction with the drawings. In this embodiment, the novel structural sewing thread includes a first chemical fiber filament and a second chemical fiber filament. The first chemical fiber filament is the core filament, and the second chemical fiber filament is the sheath filament. It also includes a sheath-core chemical fiber filament, which is a torque-adjusting filament and is adjusted by twisting. The second chemical fiber filament and the sheath-core chemical fiber filament are irregularly meshed and tightly twisted around the first chemical fiber filament. The sheath-core chemical fiber filament is heat-fused and bonded to the first and second chemical fiber filaments at the points where they cross to form a solidified structure. The sheath-core chemical fiber filament is a bicomponent fiber that forms a concentric circle structure similar to a "cable," where the "core" part provides mechanical strength, while the "sheath" part is responsible for surface melt bonding performance.

[0019] As a further improved specific implementation, the first chemical fiber filament is a high-strength, low-elongation filament with a fineness of 50D-2500D and a breaking strength of 5-9CN / DTEX.

[0020] As a further improved specific implementation, the second chemical fiber filament is a filament with ordinary strength and elongation, a fineness of 75D-300D, and a breaking strength of less than 5CN / DTEX.

[0021] In this embodiment, the production method of the novel structural sewing thread involves feeding the first chemical fiber filament using a first set of feeding wheels with an overfeed rate of 6-8%, and feeding the second chemical fiber filament and the core-sheath chemical fiber filament using a second set of feeding wheels with an overfeed rate of 20-35%. Both are fed into an air nozzle for air deformation treatment. After air deformation treatment, the threads are then sequentially twisted, dyed, drawn, heat-set, oiled, and packaged into pagoda-shaped threads. This invention uses different overfeed rates combined with air deformation treatment to achieve the winding of the second chemical fiber filament and the core-sheath chemical fiber filament onto the first chemical fiber filament, forming an irregular mesh. The core-sheath chemical fiber filament is then twisted and tightened, and after drawing and heat setting, the core-sheath chemical fiber filament is heat-fused to the points where it intersects with the first and second chemical fiber filaments to form a solidified structure. Air deformation, twisting, dyeing, drawing and heat setting, oiling, and packaging are all existing processes.

[0022] As a further improved specific implementation, the air deformation winding speed is 300-550 m / min, and the air pressure is 7-10 BAR.

[0023] As a further improved specific implementation, the twisting degree is 250-600 twists / meter, and the spindle speed is 3000-5500 rpm.

[0024] As a further improved specific implementation, the draw ratio of the heat setting process is 1-1.1, the draw speed is 50-200 m / min, and the draw temperature is 120-200 degrees Celsius.

[0025] As a further improved specific implementation, the dyeing process involves heating at a rate of 1 degree / minute, maintaining the temperature at 120-130 degrees for 60 minutes, cooling to 80 degrees, and then performing reduction cleaning.

[0026] I. Comparison of Physical Indicators Physical RxSF comparison between 60TEX ring-spun polyester sewing thread and the new structure sewing thread: project New structural sewing thread Ring-spun polyester sewing thread Fracture strength (CN) 2450 2200 Fracture strength CV value (%) 2 5.5 CV value of weight unevenness 1 1.2 100,000 meters of yarn with defects (complete) (pieces) 2 39 Elongation at break (%) 13 14.5 The data comparison above shows that the performance of the new structure sewing thread is significantly better than that of ring-spun polyester sewing thread.

[0027] II. Production Process Comparison The production process of the new structure sewing thread: FDY one-step spinning - air texture - twisting - dyeing - drawing and heat setting; Ring-spun polyester sewing thread: spinning - drawing - cutting - opening - carding - drawing - roving - spinning - self-winding - drawing - dyeing; Excluding packaging and transportation, the production process of ring-spun polyester sewing thread involves six more steps than that of the new structure sewing thread. Obviously, the social resources and time required to produce the new structure sewing thread are much less than those required for ring-spun polyester sewing thread.

[0028] III. Clean production by users Compared to the new structural sewing thread, ring-spun polyester sewing thread has more and longer fibers. During the sewing process, these fibers fall off, forming fluff that surrounds workers and can be inhaled, affecting their health. The new structural sewing thread, with its looped outer layer secured by heat-fused adhesive points, is less prone to falling off, creating a cleaner working environment and effectively protecting workers' health.

[0029] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel construction sewing thread comprising a first man-made filament and a second man-made filament, the first man-made filament being a core filament and the second man-made filament being a sheath filament, characterized in that: The core-sheath filament is a torque adjusting filament, the second filament is irregularly netted and tightly twisted around the first filament, the core-sheath filament and the first filament and the second filament are hot melt bonded at the position of cross contact to form a solidified structure.

2. The novel construction sewing thread of claim 1 wherein: The first filament is a high strength and low elongation filament, the fineness is 50D-2500D, and the breaking strength is 5-9CN / DTEX.

3. The novel construction sewing thread of claim 1 wherein: The second filament is a common strength and elongation filament, the fineness is 75D-300D, and the breaking strength is less than 5CN / DTEX.

4. A method for producing the novel structure sewing thread as claimed in any one of claims 1 to 3, characterized by: The first filament is fed by a first group of feed wheels with an overfeed rate of 6-8%, the second filament and the core-sheath filament are fed by a second group of feed wheels with an overfeed rate of 20-35%, and then air texturing is performed, and then twisting, dyeing, drawing heat setting, oiling and packaging are performed in sequence.

5. The method of producing a novel construction sewing thread according to claim 4, characterized in that: The air texturing winding speed is 300-550m / min, and the air pressure is 7-10BAR.

6. The method of producing a novel construction sewing thread according to claim 4, characterized in that: The twisting twist is 250-600 twists / m, and the spindle speed is 3000-5500rpm.

7. The method of producing a novel construction sewing thread according to claim 4, characterized in that: The drawing heat setting draft ratio is 1-1.1, the drawing speed is 50-200m / min, and the drawing temperature is 120-200 degrees.

8. The method of producing a novel construction sewing thread according to claim 4, characterized in that: The dyeing temperature rising speed is 1 degree / min, the temperature is kept at 120-130 degrees for 60 minutes, the temperature is reduced to 80 degrees, and then reduction cleaning is performed.

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