JPS61108745A - Composite sewing yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention has an extremely beautiful seam appearance, excellent heat resistance, and is suitable for high-speed sewing and then for severe sewing such as thick material sewing. This invention relates to composite sewing thread.

(Prior art) Various sewing threads have been developed depending on the application, such as 1M industrial thread for clothing.Among them, the development and development of synthetic fiber mikun thread has been remarkable.

Among synthetic fiber materials, polyester/L/lJ
Polyamide fibers and polyamide fibers are two sides of the same coin, and due to their high strength, abrasion resistance, cost benefits, and other factors, they can be used to replace conventional natural fiber sewing threads for clothing and for industrial use. It has grown into a major sewing thread material. Also.

Compared to natural fibers such as cotton, these synthetic fibers have a weaker heat resistance.In contrast, cotton, which has excellent heat resistance, is used as the sheath component, and synthetic fiber multifilament such as polyester TVT or polyamide is used as the core component. 9. As a so-called core yarn, it combines the heat resistance of cotton with 1. the high strength of synthetic fibers! Core yarn sewing threads have also been developed.

(Problems to be solved by the invention) The main material of the sewing thread is polyester/%/a fiber,
Sewing thread made of polyamide Ia#l is used under appropriate sewing conditions t.
-If progress is made, the excellent properties of strength and abrasion resistance will be utilized for seam properties, but the melting point of these fibers is at most 23
Under severe sewing conditions such as sewing at 0 to 260° C., sewing on thick fabrics, etc., there is a drawback that the sewing needle melts and breaks due to the frictional heat generated when the sewing needle penetrates the fabric during sewing.

In addition, these multifilaments are used as a core and natural fibers such as #I6 are placed in a sheath to create nine-core yarns.
The heat resistance of the yarn is improved to some extent, but the staple fibers that make up the sheath component are completely the core of the multi-fiber yarn) 1-
Coating had the disadvantage that the portions protruding from the surface of the lumber 1 would melt due to the frictional heat when placed, resulting in a significant decrease in the strength of the lug 1. Separation of the core/sheath components occurs due to rubbing, and the appearance of the stitches deteriorates.Therefore, it has been desired for a long time to develop a sewing thread that completely improves these problems.

(Means for Solving the Problems) The present invention takes primary means to solve the problems. In other words, one aspect of the present invention is.

A composite sewing thread composed of a composite yarn made of a mixture of staple fibers and filaments, the staple A/
This is a composite sewing thread characterized in that the melting point of the fibers is 250° C. or higher, and the filaments are made of nylon 46ffl fibers.

The present invention will be explained in detail below.

The composite thread constituting the composite sewing thread is a mixture of staple A/fibers and nylon 46 fiber filaments. The reason why 46 nylon fibers are used is to improve the heat resistance of the sewing thread. This nylon 46 fiber has a molecular chain repeating unit of 90% by weight or more, NH-(CH2)4.
-NHCO-(CH2)4-CO→ A polyamide fiber consisting essentially of poly(tetofumethyleneazibamide), which is copolymerized with a C-capfumide component, a hexamethyleneadipamide component, and a weight below or polymers consisting of these, i.e. poly(#-capfumide)
, poly(hexamethylene adipamide), poly(hexamethylene derephthalamide), poly(kungcamethylene tele 7 thalamide), etc., may include a blend of t-10 weight*s or less.

Also, if necessary, a matting agent, a light stabilizer, etc.

Heat stabilizers, antioxidants, antistatic agents, dyeability improvers, adhesion improvers, etc. may be blended, except for those that have a serious adverse effect on the characteristics of the present invention depending on how they are blended.
All available.

The nylon 46 fibers are dissolved in a 96.3 sofi sulfuric acid solution such that the polymer concentration is 1Oq/Mt, and the relative viscosity of the dissolved solution is preferably 2.
The relative viscosity of K must be 4 or more, and in order to obtain a stronger sewing thread, K must have a relative viscosity of 3.0 or more. The aim is to utilize such a high melting point to improve the heat resistance of the sewing thread against frictional heat.From this point of view, it is preferable that the above-mentioned fold unit is 100 weight.

On the other hand, the melting point of the staple A/fiber is preferably 250°C or higher. This is to increase the heat resistance effect.

Staple fibers may be made of any material (or may be a mixture of more than one material) as long as it provides the performance as a sewing thread. It is preferable to use polyamide fibers of the same type as the filament, especially nylon 46t1, in view of the fact that the dye can be dyed in the same bath.

Staple fibers are natural fiber staples such as cotton and hemp, synthetic fibers or chemical fibers, and are used for short fiber spinning, long fiber spinning, equal length cut fibers, unequal length cut fibers, or tow spinning. It also includes the cut fibers obtained.

The composite yarn preferably has a melting point of 250°C or higher.
%/fiber and nylon 46t1 miscellaneous filament for the following reasons.

In other words, by using nylon 46 fiber, which has high strength and excellent heat resistance, as the filament that has a dominant influence on the strength of sewing thread, and by mixing it with staple tape °1Wki & fiber, it is possible to create a filament that contains an air layer in the bulk. As a structural thread, it is intended to reduce the rise in temperature of the sewing needle due to frictional heat during sewing, and to further improve the heat resistance effect by improving the method of contact with the sewing needle. Note that the term "mixing" used here refers to cedar@ in which filament and stay 11%/fiber are evenly mixed together and the 9 portions exist at least intermittently in the longitudinal direction of the yarn. A/IIt! is a staple produced by overlapping and twisting a dofted fiber bundle. A mixture of nylon 46 fiber filament 1! ! means.

When it takes such a shape, it should be particularly excellent in thread-like uniformity, have stable friction properties, stable sewing properties, and dramatically improve seam appearance.The temperature should preferably be 255°C or higher. The reason for this is that even if the temperature of the sewing needle rises to a high temperature during harsh a-manufacturing, it will melt! This is to prevent 1st force deterioration and 2nd appearance from becoming worse. The reason why the melting point of the staple lv fiber may be lower than that of the nylon 46 fiber of the filament component is that the heat resistance aX is not severe for the sewing thread and the strong dominant influence of the sewing thread.

Note that the melting point referred to here is differential scanning calorimetry (Shi-mi).
zu Differential Scanning
Measured using Calorimeter SC-20) at a heating rate of 20°C/i.

Further, the melting point refers to the temperature ('C) t- at the peak of the melting endothermic curve measured by the differential scanning calorimeter.

The composition ratio of staple fibers and nylon 46 fiber filaments constituting the composite sewing thread according to the present invention is 20 to 80 weight -1 in terms of the composition ratio of filaments to sewing thread.
The range is preferably from 35 to 80% by weight, and more preferably from 45 to 75% by weight. If it is less than 20% by weight, there will be a lot of staple Ivwtla. Taking advantage of the high strength and special resistance of nylon 46 fiber filament,
In addition, it is difficult to form a uniform filament.

Moreover, if the weight exceeds 80 St, the yarn becomes a tight structural yarn like fiftment yarn, and if it is strongly affected by the sewing needle raised to a high temperature during sewing, the heat resistance will decrease.

Preferably, 2 to 6 of the composite threads are twisted together to form a composite sewing thread. If there is only one thread, there is a problem of thread breakage due to thread breakage, especially when used as a needle thread, and if there are more than six threads, there will be a problem in terms of thickness.

It is preferable that the direction of twisting is 2, and the number of twists is 5oo.
It is preferable to set it in the range of ~Looot7m.

Furthermore, the composite sewing thread of the present invention can be subjected to a heat treatment such as a straight stretch treatment to improve the initial Young's modulus, reduce stitch skipping and yarn breakage, and further improve the 111 m property.

(Example) 70 Deny N/24 fitting nylon 461IL
Filament yarn T - 1 or 2 mites electro-opened and dofted in front of the front roller of the spinning machine - /
Nylon 46 fiber staple with the same cut length as v44〃Layered with a fiber bundle (melting point 290℃) to a twist coefficient of 3.5 (j
N
e 50'S composite yarn (filament blend ratio is 65.9
After that, the t-3 composite yarns were pulled together and twisted at 780t/m in the opposite direction to the single yarn twisting.
Using non-contact W & mold heater, 230℃X1.21! e(
D fixed length set.

After that, using acid dye on the husk of soft-rolled cheese, Boi/%
/40 minutes to stain and next. After that, I applied 3 ts of silicone-based oil and made a sewing thread sample.

Sewing thread physical properties and sewability tests were conducted, and the results are shown in Table 1.

In addition, Table 11 shows among the commercially available synthetic sewing threads, polyester with excellent heat resistance, spun sewing thread -50C50), striped/polyester core yarn minced thread #50 (43), l'! 17 Aesthetic Filament Sewing Thread 40 (&4) and Nylon 46 Fifment Minon Thread C&5) are listed for comparison.

In the table above, strength and elongation (breakage) are measured using a constant speed extension type tensile tester (X
Measured using Den V Ron (manufactured by Western Boldwine Co., Ltd.)
Values and melting points are determined using the differential scanning calorimetry needle (DSC) mentioned above.
). In addition.

a/Polyester core yarn The melting point of the yarn is expressed as the melting point of the polyester filament yarn.

Thread breakage in the sewability test was evaluated by the number of thread breakages when 50 pieces of cotton work clothes were sewn together with 2 layers of seven-stitch sewing machine at a rotation speed of 400 rpm. It was. The number of lines is Polyester A/
/Cotton blend (65/35) workwear fabric was evaluated based on the maximum number of layers that could be sewn without thread breakage of 2 m, and this evaluation indicates the degree to which it can withstand severe sewing.

9. The seam appearance of the above-mentioned work clothes fabric & i fabric is visually determined by FJ, and the seam appearance is indicated by t-o~Δ. O indicates excellent, ○ indicates good, and Δ indicates average.0 The composite sewing thread of the present invention has fewer thread breakages during sewing, and the number of threads is significantly superior to conventional sewing threads, and is sufficient even during harsh AM conditions. It was durable. In addition, the sewn seams are thread-like and even, giving it an extremely beautiful appearance.

The quality of the seams is superior to the appearance of seams made with conventional sewing thread.

(Effects of the Invention) As described above, the composite sewing thread of the present invention has an extremely beautiful seam appearance, excellent heat resistance, and is a high-quality sewing thread suitable for severe sewing such as high-speed sewing and thick material sewing. .

Claims (1)

[Claims] A composite sewing thread composed of a composite yarn made of a mixture of staple fibers and filaments, characterized in that the filaments are composed of nylon 46 fibers.