JPS6323293B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a water-repellent sewing thread and a method for producing the same. Traditionally, when sewing products that require waterproofness, such as raincoats, diaper covers, and tent umbrellas, the seams are sealed using hot melt agent, etc. to prevent water from leaking from the seams. Alternatively, methods have been taken in which the sewing thread itself is treated with a special water repellent in advance. However, the former method has the disadvantage of hardening the seams or requiring extra steps, and the latter method is difficult to sew with modern high-speed and complicated sewing machines. In other words, the treatment agents that have been devised so far, which are mixtures of paraffin wax, vaseline, grease, etc., have the drawback of easily causing sewing defects such as thread breakage and skipped stitches. The present invention provides a water-repellent sewing thread having excellent performance not found in conventional sewing threads, and a method for producing the same. However, its characteristic feature is that it has a so-called three-layer structure in which a water-repellent film layer is provided on the surface of the fiber threads that make up the sewing thread, and a smoothing agent layer is further provided on the surface of the water-repellent film layer. . To explain the details below, Fig. 1 shows a sewing machine of the present invention in which the surface of triple-twisted sewing machine yarn 1 is entirely coated with a water-repellent film layer 2, and the entire surface is further coated with a smoothing agent layer 3. FIG. 2 is a cross-sectional view taken along the line A--A in FIG. 1, showing an example of a thread. FIG. 3 shows another example of the present invention in which the surface of the sewing machine thread 1 is entirely covered with a water-repellent film layer 2, and a smoothing agent layer 3 is further formed partially on the surface. This is a cross-sectional view taken along the line AA in FIG. 3. Incidentally, the yarn 1 constituting the sewing thread according to the present invention is made of any material such as mono or multifilament yarn of synthetic fibers such as nylon or polyester, spun yarn, or natural fibers,
It is made by doubling, ply-twisting, etc. The water-repellent coating layer 2 is formed by applying a water-repellent agent uniformly on the surface of the yarn 1 in the form of combs and then heat-treated to fix it, and the smoothing agent layer 3 is formed by continuously running the yarn by, for example, a roller touch method. It is made by slowly attaching it. Next, the manufacturing method will be explained. The most preferred example of the treatment of the present invention is to use synthetic fibers, especially polyester spun yarns, which are hydrophobic fibers, as a raw material, to immerse it in a fluorine-based water repellent in the form of combs, and then to convey it onto a belt conveyor. It is treated in a type dryer at a temperature of 150℃ to 190℃ for 30 to 180 seconds, and then mixed with a smoothing agent mainly composed of dimethylpolysiloxane, such as high viscosity dimethylpolysiloxane and low viscosity dimethylpolysiloxane. Furthermore, a smoothing agent such as paraffin wax is added to this by a roller touch method while the yarn is continuously running. In addition, it is preferable to perform the water repellent treatment in the form of combs in terms of treatment effect and economy, and heat treatment at 150 to 190℃.
It is best to do this continuously for 30 to 180 seconds. If these conditions are exceeded, the water repellent performance will deteriorate, which is not desirable.
When applying the smoothing agent, it is possible to apply the smoothing agent to the entire surface or to parts of the yarn by an appropriate means such as intermittent contact of the yarn with the roller. Examples of the present invention are given below. Example: 100% polyester spun yarn is first twisted, three yarns are combined and final twisted, then machine thread is used, and this is immersed in a fluorine-based water repellent in the form of a skein. at 180℃ in a belt conveyor type dryer.
Heat treated for 100 seconds, and then mixed with a smoothing agent made by mixing high- and low-viscosity dimethylpolysiloxane with paraffin wax (for example, 1000 centistoke dimethylpolysiloxane, 100 centistoke dimethylpolysiloxane and paraffin wax with a melting point of 120). A smoothing agent (such as a mixture of 6:3:1 by weight) is applied by continuous running using a roller touch method. In this way, a water-repellent film layer is provided on the surface of the yarn, and a smoothing agent layer is further provided on the surface of the water-repellent film layer.The yarn conditions are exactly the same as those of the sewing thread of the present invention, and only the fluorine-based water repellent is used. Table 1 shows the performance comparison between the conventional product (comparative product 1) to which a water-repellent agent made of a mixture of a low-viscosity leveling agent and solid paraffin was attached (comparative product 2). be.

[Table] The smoothness is the smoothness when the thread runs at 250m/min. The stitch skipping is Yamato double chainstitch DS with a rotation speed of 4400 rpm.
−100 Stitch defect rate when sewing a product with a sewing machine. In addition, the water repellent spray method uses JIS after knitting the yarn into a tube and opening it. L-1079 Test method using A method. A simple method is to sew two pieces of waterproof fabric into the shape of a ship's bottom using test yarn, fill it with water, and check for leakage after 24 hours. As is clear from the above results, the product of the present invention has extremely superior sewing performance and water repellency compared to conventional products. In particular, in terms of sewing performance, the thread has good slippage, making it extremely suitable for application to high-speed, complicated sewing machines. In addition, the water-repellent property is extremely effective because the water-repellent agent is exposed through sewing, and it can be used in a wide range of applications such as various clothing items and industrial applications that require water leakage prevention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the sewing thread of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a perspective view showing another example of the sewing thread of the invention, and FIG. is a sectional view taken along line A-A in FIG. 1...Sewing machine thread, 2...Water repellent film layer, 3
...Smoothing agent layer.

Claims (1)

[Scope of Claims] 1. A water-repellent coating layer made of fluorocarbon resin is provided on the surface of the fiber threads constituting the sewing thread, and the surface of the water-repellent coating layer is further coated with a mixture of dimethylpolysiloxane and paraffin wax. A water-repellent sewing thread characterized by being provided with a smoothing agent layer consisting of: 2. In producing water-repellent sewing thread, the fiber threads constituting the sewing thread are woven into a skein and immersed in a fluororesin bath, and then heat-treated and treated with a mixture of dimethylpolysiloxane and paraffin wax. 1. A method for producing water-repellent sewing thread, which comprises processing the thread by continuously running the thread in a processing bath consisting of: