JPS6043470B2 - Difficult to melt synthetic fiber sewing thread - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a new hardly meltable sewing thread which particularly has improved heat resistance and prevents fusing caused by needle heat generated during sewing.

In recent years, the performance of sewing machines has become more diverse as the speed has increased, and in particular, from the perspective of improving sewing efficiency, the number of revolutions has increased from 3500 to 4500.
It has reached p and m, and some even exceed these.

On the other hand, there are a variety of materials that can be sewn using this method, from thin fabrics to thick fabrics such as working wear, jeans, jets, and juice, and it is rare to sew four or five layers of these together. It doesn't seem like it.

Therefore, the speed increase and the sewing of sewing materials are becoming more difficult.
-L-I゛L sewing; ^Y1fu) An abnormally high fever occurs, for example, when sewing jeans, etc.
It can even reach 80-35CfC. According to various experiments and considerations by the present invention, at a rotation speed of 4000,
When sewing 5 layers of T/C blend fabric with #16 sewing needle using P and M lockstitch sewing machines, the temperature of the sewing needle is 280'C.
It was found that it reached

This needle temperature far exceeds the melting point of various synthetic fibers such as nylon and polyester, and while the sewing machine can withstand relatively high temperatures while it is running, it may not be able to withstand it after long periods of operation or immediately after stopping operation. To melt. In addition, tension is generated in sewing thread as the needle moves, and plastic deformation occurs under the influence of heating and tension, making it easier to stretch and cut. The loop is instantaneously stretched into a comb shape, and since this does not involve the actual length (the length of sewing thread necessary to form the loop), the loop formed is small and deformed, resulting in frequent skipped stitches.

In addition, when looking at sewn products, the seams are sewn while being plastically deformed and stretched, resulting in seams that are difficult to adapt to solid materials, and the threads become thinner, making them easier to cut. Conventionally, methods to solve such problems have been to suppress the rotation of the sewing machine, install an air-cooling device, apply various smoothing agents to make the paternity line better, and use wax that generates heat. , it was not perfect in its effect. On the other hand, the inventors of the present invention have previously invented a device to which a large amount of high-viscosity dimethylpolysiloxane is deposited, as disclosed in Japanese Patent Application No. 56-93521, in order to solve this problem. (According to the publication, the fusing phenomenon of sewing threads is significantly improved), but on the other hand, the processing agent falls off and accumulates on the looper, hook, etc., causing skipped stitches, etc., and there is still room for further improvement.

The present invention provides a new sewing thread that is an improved version of this sewing thread, and is characterized in that at least the surface of the sewing thread made of synthetic fiber material is covered with high melting point polyethylene (melting point 120-150). ℃), or polyethylene glycol alone or as a mixture is formed, and the viscosity at 25℃ is 10 on the surface.
The second coating layer is formed by depositing a mixture of dimethylpolysiloxane of 000 centistoke or more and dimethylpolysiloxane of 100 centistoke or less. The details will be explained below. Materials used in the present invention include nylon, polyester, vinylon,
Various synthetic fibers such as filaments such as acrylic and polypropylene and spun yarns can be considered, but nylon and polyester, which are often used in terms of cost and applicable materials, are particularly desirable.

Among them, polyester-based materials with high melting point and high strength are preferred. The material should preferably have high strength and low elongation according to the above-mentioned relationship, for example, one with a cutting elongation of 4 g/d (grams/denier) or more and a cutting elongation in the range of 10 to 20%. It is. In the present invention, a synthetic fiber yarn selected from the above is made into a sewing thread using commonly known means such as first twisting, doubling, and ply twisting, and is subjected to the following treatments. That is, to explain this in detail, first of all, at least the third surface (
High melting point polyethylene (melting point 120 to 150° C.) or polyethylene glycol is applied alone or in combination to form a first film layer.

All of these processing agents are characterized by being sparingly soluble in dimethylpolysiloxane and having a high melting point of 4, which allows them to protect the core sewing threads and reduce the amount of dimethylpolysiloxane used. have an effect. It is preferable that the polyethylene glycol has a melting point of 50'C or higher, and its adhesion amount is 5 to 10% in the case of high melting point polyethylene and 5% in the case of polyethylene glycol in terms of weight ratio to the fiber.
The following are preferred. The treatment agent is applied to the running yarn by a roller touch method or the like, and once dried to form a first film layer. Next, a mixture of dimethylpolysiloxane having a viscosity of 10,000 centistokes or more and a dimethylpolysiloxane having a viscosity of 100 centistokes or less at 25°C is further adhered to the surface of this to form a second film layer.
In this process, the two are mixed and heated, and the mixture is applied by a roller touch method, etc., but the amount of adhesion varies depending on the combination of high and low viscosity dimethylpolysiloxanes and the application. In the case of a combination of centistoke dimethyl polysiloxane and 10 centistoke dimethyl polysiloxane, they are blended at a weight ratio of 1:1 and are attached at a weight ratio of 15% or less, preferably 5 to 13%, to the fiber. Demonstrates suitable sewing ability. This formulation maintains smoothness, facilitates adhesion processing, prevents the occurrence of skipped stitches due to shedding and accumulation of high viscosity dimethylpolysiloxane, and makes good use of the performance of high viscosity dimethylpolysiloxane. It is something.

Therefore, the combination of viscosities, compounding ratio, and amount of adhesion should be selected and used according to the purpose. The sewing thread of the present invention having the above structure can significantly improve the softening and melting temperature during sewing (that is, the softening and melting temperature that the thread experiences during actual sewing) regardless of the material, and is strong, heat resistant, and flexible. It has excellent sewing properties and is suitable for high-speed sewing as a non-fusible sewing thread, and is suitable for sewing thick clothing such as working wear and jeans.

This will be explained below with reference to examples.

Example 1 Polyester spun thread #50/1×3 (
Z twist) sewing thread was used, and Meikatex Tanuki-600 (trade name) manufactured by Meisei Chemical Industry Co., Ltd. was used as the high melting point polyethylene.

This is made into an emulsion (solid content 25%) with 3 active ingredients.
%0 wf by a roller touch method, and then dried at 90'C for 2 hours to form a first film layer.
Next, a treatment agent prepared by mixing dimethylpolysiloxane with a viscosity of 100,000 centistokes and dimethylpolysiloxane with a viscosity of 10 centistokes at a weight ratio of 1:1 at 25°C was heated to 70°C, and a 10%
0. w. A second film layer was formed by adhering f to obtain a product of the present invention.

<Example 2> A sewing thread material of polyester spun yarn #60/1×3 (Z twist) was used, and polyethylene glycol (polymerization degree 60
00) with 5% of active ingredients. w. After adhering by a roller touch method as shown in f, the first film layer was formed by drying at 90° C. for 20 hours.

Next, a second film layer was formed by processing under the same conditions as in Example 1 to obtain a product of the present invention. The thus obtained shimming thread of the present invention has excellent sewability as shown in Tables 1 and 2.

The evaluation method is as follows. Average sewing length and number of skipped stitches when sewing conditions were repeated 5 times with a sewing length of 110 stitches.

Claims (1)

[Claims] 1 High melting point polyethylene (melting point 120
to 150°C), or polyethylene glycol is applied alone or as a mixture to form a first film layer, and then dimethylpolysiloxane with a viscosity of 10,000 centistokes or more and a viscosity of 100 centistokes or less at 25°C is further applied to the surface of the first film layer. A poorly soluble synthetic fiber sewing thread, characterized in that a second film layer is formed by adhering a mixture of dimethylpolysiloxane.