JPH0345737A - High strength sewing thread - Google Patents

Abstract

PURPOSE:To provide a sewing yarn comprising polyester filament yarn and staple fiber yarn each having a specific single fiber fineness, tenacity and Young' s modulus, having high strength, excellent abrasion resistance and excellent flexibility and suitable for sewing thick web products such as rush mats, military art wears, shoes, bags, balls and jeans. CONSTITUTION:The objective sewing yarn comprises the filament yarn of a polyester having a single fiber fineness of 3-10d, tenacity of >=10g/d and a Young's modulus of >=500g/d and the staple fiber of the same polyester. The polyester does not include polyethylene terephthalate and polybutylene terephthalate. The sewing yarn is preferably composed of a polyester fiber yarn made from a thermotropic liquid crystalline rigid polymer containing >=50wt.% of aromatic rings, especially that made from a thermotropic liquid crystalline polyester prepared from p-hydroxybenzoic acid and 6-hydroxy-2- naphthoic acid.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The invention relates to a sewing thread with high strength and excellent abrasion resistance and sewability, in particular a single fiber R degree of 3 to 10 d and a strength of 10? The present invention relates to a sewing thread containing polyester long fiber yarn and short fibers having a Young's modulus of 500 − or more and a Young's modulus of 500 − or more.

(Prior art) JP-A-60-162826 discloses a sewing thread consisting of a polyester long fiber yarn alone, a button, and a twisted sewing thread of the long fiber yarn and a polyester spun yarn, and the sewing thread strength is about 30 kf. It is also explained that it extends to In particular, the patent explains that the necessary strength as a sewing thread can be maintained by the polyester long fiber yarn, while the sewability as a sewing thread can be imparted by the polyester spun yarn.

Japanese Unexamined Patent Publication No. 62-6928 discloses a sewing thread made of polypropylene split yarn, and states that the thread strength is about 9 in 20.

Furthermore, as a similar technique, Japanese Patent Application Laid-Open No. 170544/1983 discloses a warp for tatami mats containing high-strength vinylon, and the warp tenacity is said to be about 25:9.

In addition, as a related application related to the applicant's application,
There is No.-293640. This invention relates to a sewing thread for baseball poles using a high tenacity, high Young's modulus polyester fiber similar to the present invention, and the sewing thread composition includes a sewing thread made from a long fiber yarn of the same fiber and a short fiber yarn of the same fiber, that is, a spun yarn. discloses sutures from threads, with the latter being more preferred.

(Problems to be Solved by the Invention) The present invention is different from this invention, and relates to a sewing thread that uses a long fiber yarn and a spun yarn in combination, and by using them together, the advantages and disadvantages of sewing threads made of individual threads can be exploited. This is a supplement.

(Means for Solving the Problems) The aim of the present invention is to increase the strength of the sewing thread to 40k.
The object of the present invention is to provide a high-strength sewing thread with a strength of F or higher, and further relates to a polyester fiber sewing thread that has excellent abrasion resistance against friction during use (sewing).

The feature of the present invention is that high-strength polyester fiber is used as the sewing thread material, and specifically, the single fiber fineness is 3 to 10 d, the strength is 10 r/d or more, and the -Young's modulus is 500 f/d. The above-mentioned polyester fibers are used in combination in the form of long fiber yarns and short fibers. More preferably, polyester fibers have a melting point of 280° C. or higher or have virtually no melting point.

Furthermore, in order to further improve the effects of the present invention, it is desirable that the surface of the sewing thread be treated with a resin. Examples of types of resin include fluorine-based polymers, silicone-based polymers, etc.
High melting point polyethylene is preferred, and the surface treatment with these side fats improves the sliding properties of the sewing thread, which prevents the generation of AM heat and contributes to improving the abrasion resistance of the button during sewing and of the sewing thread after sewing. do. The amount of resin applied is preferably 0.1 to 5% based on the weight of the sewing thread before treatment.

The present invention differs from the prior art in the structure of the sewing thread, and in other respects, conventional techniques applicable to conventional sewing threads can be applied.

The sewing thread material has the highest strength among polyester fibers.
Q f/d or higher, Young's modulus of 500 g/d or higher, high tenacity, high Young's modulus fiber, conventionally well-known polyethylene terephthalate-based or polybutylene terephthalate-based polyester fiber (although there are some that have an additional strength of 1'FAs, Young's modulus is completely unsatisfactory) is not included. Polyester fibers that satisfy this requirement include, for example, fibers called molten liquid crystal polyester fibers, and particularly preferred are polyester fibers made of a molten liquid crystal rigid polymer containing 50% or more by weight of aromatic rings. In particular, polyester fibers made from molten liquid crystalline polyester obtained from paraoxybenzoic acid and 6-hydroxy-2-su'phthoic acid have a strength of 10 f/d or more and a Young's modulus of 500.
r/d or more, the melting point is 280° C. or more, and by using the structure defined in the present invention, the sewability and abrasion resistance are significantly excellent.

By satisfying both the strength and Young's modulus specified in the present invention, the strength, abrasion resistance, and high-speed sewability of the sewing thread can be obtained. A further important point in the present invention is that the fineness of the polyester fiber should be between 3 and 10 d;
If it is less than d, thread breakage is likely to occur during sewing, and if it exceeds 10 d, the fibers will be too hard and unsuitable. The optimal fineness is 3-6
It is d.

Sewing threads containing high-strength polyester fibers in this range are completely smooth not only when processed as sewing threads but also when used as sewing threads.Durability (wear resistance) of 17 (no thread breakage or skipping)
It can be used while maintaining the

In particular, polyester fibers with a high melting point of 280° C. or higher have the advantage that they can be used with ease both during sewing thread processing and when sewing thread is used.

The sewing thread of the present invention is composed of a mixed yarn of long fiber yarn and short fiber yarn (spun yarn) of the above-mentioned high-strength polyester fibers, or a core yarn having a long fiber yarn as a core and a group of short fibers as a sheath. There are things that are configured. This is because, from the standpoint of strength, long fiber yarn is superior, but in order to satisfy both strength and sewability, it is necessary to use a mixed yarn of long fiber yarn and short fiber yarn, or yarn with long fiber yarn and short fiber yarn. It is necessary to use a combination type of core yarn, etc., and in this case, the mixing ratio of short fiber yarn must be 50% or less, and at least 10%. As such, the strength satisfies approximately 4 Q kp or more, and it is a high-strength sewing thread that has not been realized by conventional technology. The fiber length of short fibers is 20-70F.
ml is preferable.

The sewing thread composition of the present invention may be double-twisted or single-twisted;
The ply twist may be heated to about 300 T/M% or vice versa. It is preferable to use opposite twisting directions for the first twist and the second twist to prevent skipped stitches during sewing.

The present invention will be explained below with reference to Examples and Comparative Examples.

Examples 1 and 2, Comparative Examples 1 to 3 Made of molten liquid crystalline polyester from paraoquin benzoic rR (70 mol%) and 6-hydroxy-2-naphthoic acid (30 mol%), fineness 5d1 strength 25 f/d, Young Sewing threads shown in Table 1 were prepared from long fiber threads and short fibers (45mm 1.1 cut) having a rate of 600 f/d and a decomposition temperature of 400°C. For comparison, sewing threads were prepared in which the threads were made of only the long fibers, those made of the short fibers, and the threads made of aramid fibers (Kevlar). In Table 1, PEF is a long fiber yarn of the above polyester fiber, PES is a short fiber yarn (spun yarn) of the same fiber, and PAFi is a long fiber yarn of liquid crystal polyaramid fiber (spun yarn) having almost the same physical properties as the above fiber. However, the single fiber fineness is 15d). Example 1
, The mixed use ratio of PES in 2 is approximately 22 cases. The measurement of abrasion resistance is the number of times of abrasion during cutting when a load of 1502 is applied to the sewing thread and the thread is abraded by a grinder. The sewability was measured by measuring the tensile force when sewing thread was applied in a zigzag pattern to four tensors, and approximately 4 to 5 kg of tatami thread was suitable. Here, if the tensile force is less than 4 to 9, the thread tension will be poor when used as a sewing thread, and if it exceeds 6+Q, the threads t and t will be too tight, so a moderate tensile force range is preferable.

Note that the PEF%PES used in the above examples is an example in which the surface of the yarn is not treated with a resin treatment for wear resistance, but the yarn is treated with a resin treatment ( By applying a fluororesin 'ff: 0.8 '1), the abrasion resistance of Example P was able to be increased about 7 times.

The sewing thread of the present invention can be used for tatami threads, sewing threads for military equipment, bags, bags, etc.
It is effective as a sewing thread for balls, a sewing thread for thick fabrics such as jeans, etc.

Claims (1)

[Claims] 1. A high-strength sewing thread consisting of polyester long fiber yarn and short fibers having a single fiber fineness of 3 to 10 d, a strength of 10 g/d or more, and a Young's modulus of 500 g/d or more.