JPS5971451A - Polyester sewing machine yarn for embroidering and producti-on thereof - 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 The present invention relates to an embroidery sewing thread made of polyester filament thread that is easy to handle.

Conventionally, racon filaments have been mainly used for embroidery sewing threads for reasons such as dyeability and color development. However, since rayon has low strength, thread breakage occurs frequently during the single twist process, resulting in a large number of knots in the sewing thread, which reduces sewing performance. Furthermore, there is a problem in that even the parts without knots have low sewability due to their low strength. In order to solve this problem, attempts were made to use polyester filament, but these had the drawbacks of requiring high-pressure dyeing and insufficient color development for embroidery sewing thread. In addition, since polyester filament is generally very strong, it is difficult to remove loose threads at the end of an embroidery pattern on an embroidery machine by simply tearing them off, and it is necessary to use tools such as scissors. The problem of decreased elasticity has also become apparent, and it has not yet reached the point where it can be used as a substitute for rayon sewing thread.

The purpose of the present invention is to improve the above-mentioned drawbacks of rayon sewing thread and conventional polyester sewing thread for embroidery, and to provide good handling properties such as twisted thread, good dyeability, and color development. To provide a new polyester sewing thread for embroidery, which has good sewability on an embroidery machine, and allows loose threads at the end of an embroidery pattern to be easily removed by simply tearing them off by hand, and a method for producing the same. There's K things to do.

That is, the present invention is a sewing thread obtained by twisting a polyester filament yarn with a twist coefficient in the range of 2,000 to 10,000 to form a single yarn, and twisting 2 to 7 of the single yarns. , total tensile strength of core-ply yarn 100-400
de, its intensity is 1.8-2.6 t/de,
and a polyester sewing thread for embroidery, characterized in that the modulus at the cutting elongation of the twisted yarn is 80 - fill I/C in the range of 0.1 to 4 f/de; Polyester sewing thread for sewing machines is made by highly oriented melt-spinning of polyester whose main repeating unit is ethylene terephthalate so that the birefringence Δn of the entire fiber after spinning is Ll, 025 or more, and then it is continuously heated at 140°C or more without being wound up. Heat-treat the yarn without actively stretching it at a temperature of
200 de polyester filament yarn with twist factor 2
,000 to 10,000 to make a single yarn,
Two to seven of these single yarns are plied together so that the total denier is 100 to 400 de, ply twisted in the opposite direction to the first twist, and then heat treated at a temperature of 90 to 130 deg. You can get it.

The present invention will be explained in detail below.

The polyester filament yarn used in the embroidery sewing thread of the present invention has a birefringence Δ of the entire fiber after spinning the polyester whose main repeating unit is ethylene prephthalate.
Highly oriented melt-spun so that n is 0.025 or more, and then heated to 140°C without winding up.
After heating the yarn without actively stretching it,
Obtained by stretching.

Prior to the stretching process, it is necessary to perform a heat treatment at a high temperature. A temperature of 140° C. or higher is preferably used, and during the heat treatment, a thread that does not actively stretch the yarn is required. This is aimed at increasing the crystallinity of fiber molecules prior to drawing, that is, prior to high orientation.

The heat-treated yarn is then subjected to a stretching treatment, and the stretching conditions can be carried out at a temperature below the secondary dislocation point and at a stretching ratio up to the cutting limit of the yarn. Those whose crystallinity has increased by 32 K due to the previous heat treatment may be subjected to low-temperature stretching 17 at a temperature below the second-order dislocation point, but may also be subjected to high-temperature stretching at a temperature of 150° C. or higher.

In addition, the polyester filament yarn used in the present invention is 5
It may also be a polyester having 7 repeating units mainly composed of ethylene terephthalate copolymerized with a polyamide sulfoisophthalate component.

When the main repeating unit is ethylene terephthalate copolymerized with a total of 5 fujumsulfoisophthalate components, the birefringence Δn must be 0.03 to prevent welding during the heat treatment before stretching. I hope it's above [7.

The thickness of the polyester filament thread is 50
~200 de range and [7, twist coefficient 2.00+) ~1
0. It is considered to be a single yarn with Otl O first twist.

However, the twist coefficient is defined as: x-rxi K: twist coefficient T: number (17m) D: denier. Mm coefficient is 2. If it is less than Otl O, the binding property of the thread will be poor and the sewability with an embroidery machine will be low. If the twist coefficient is greater than io, o, o, o, o, o, o, o, or more, the thread becomes too stiff and the thread becomes hard, and the gloss of the thread decreases, making it unsuitable for use as sewing thread for embroidery.

The direction of the first twist can be either S or Z, but S twist is preferable because it reduces the deterioration in sewability due to twist movement during embroidery, so 2 to 7 ready-to-twist threads are doubled. Then, a final twist is applied in a direction opposite to the first twist direction. With single thread, the torque is strong, the tension of the thread is strong, and it is difficult to use due to low sewability, and the embroidery pattern will be defective, so two or more single threads are combined. However, when eight or more yarns are combined, the lengths of the individual yarns do not match well, making it difficult to make the yarn surface smooth and making the yarn hard. The appropriate number of gold threads is 2 to 7. The number of final twists is desirably 0.5 to 0.9 times the number of final twists. In addition, the overall thickness of the twisted yarn must be between 100 and 400 de. In other words, if the thickness is less than 100 de, the thread is too thin and it is difficult to pattern it with an embroidery machine.
If it exceeds 400 degrees, on the other hand, delicate embroidery patterns cannot be obtained, and because the thickness of the thread is large, the strength of the thread becomes high, making it difficult to tear loose threads at the ends of the embroidery pattern. In addition, if the thread strength is lowered to lower the overall strength in the case of 400 de or more, fluffing is likely to occur in the embroidery machine, which is a problem as a sewing thread for stitching.

The sewing thread thus obtained has a strength of 1.8 f.
/de to 2.6 t/de. The lower the strength of the sewing thread, the easier it will be to tear loose threads at the end of the embroidery pattern, but on the other hand, the thread will break more often, and the embroidery machine will often generate fuzz, making it difficult to use sewing thread for embroidery. is not appropriate.

On the other hand, if the strength is high, the problem of fluffing will be eliminated, but the processing pressure of idle threads at the end of the embroidery pattern will be inconvenient. With these things, the strength of sewing thread is r, ay /de
A range of ~2.6 y/ae is most suitable. Furthermore, it is important for embroidery sewing thread to have a good external shape when the sewing thread at the end of the embroidery pattern is torn off. For this purpose, it is not enough just to have low yarn strength, and the cutting behavior of the yarn at the time of cutting becomes an important factor.

As a result of intensive research, this inventor has found that the area near the cutting point, especially the cutting elongation, is 8.
It has been found that the lower the slope of the high elongation curve at an elongation of 0 inches, that is, the lower the modulus at the elongation, the better the results.

That is, it is necessary that the modulus corresponding to the cutting elongation of 80 inches of the plied yarn is in the range of 0.1 to 4 f/de, and the above plied yarn satisfies these conditions. It is something. If the modulus is less than 0.1 f/de, the thread will be weak and unstable and cannot withstand use, and if it exceeds 4 t/de, snap banking will occur at the cutting point of the thread, resulting in poor shape at the cut part. is defective and the embroidery pattern becomes disordered.

Note that the method for measuring the modulus corresponding to the above-mentioned cutting elongation (80f) elongation is defined as follows.

That is, a repeated stress-strain curve was drawn using a tensile tester using five threads, and the average strength and elongation obtained from this was calculated [2.
Select one yarn with the breaking strength and elongation closest to this strength and elongation, find the tangent to the stress-strain curve at the 80-inch elongation point of the breaking elongation on the stress-strain curve, and find this value. Find the modulus using the following formula.

M (s3-X 100 here! Qa): Modulus at cutting elongation of 80 inches S: Slope of tangent line 77% D = Polyester sewing thread with characteristics such as initial denier or higher can be used in an embroidery machine. When sewn, it is possible to obtain a very good embroidery pattern that has good sewability, is easy to handle, and is free of fuzz.

Furthermore, since the polyester sewing thread is heat-treated before the raw yarn is stretched to increase the degree of crystallinity, and then stretched, it is easily dyed with a boil dyeing rate of 95 heads or more. It is something.

In particular, those copolymerized with a 5-nonramsulfoisophthalate component have remarkable dyeability, and in combination with the above-mentioned strength and elongation properties, they are excellent as sewing threads for embroidery.

Examples will be described below.

〔Example〕

The main repeating unit is ethylene terephthalate, and the proportion of 5 sodium sulfoine 7 talic acid components is 3.
Polyester copolymerized with 3 moles at a speed of 4,000'
m/7 to make a multifilament with a fineness of 80 denier and a birefringence Δn of 0.04, and then the filament was heated to a Calothermal Rosy with a surface temperature of 15L1°C.
．． After contacting for 045 seconds, it was rolled up and cooled to room temperature,
It was stretched at a stretching ratio of 1.1 times without heating.

The obtained filament had a denier of 72.7 and had a dyeing rate of 9 using a cationic dye without a carrier and at normal pressure.
It showed easy dyeing property of 9. S41 to this filament thread
A single yarn is given a twist of 0 T/M (twist coefficient 3.500), three yarns are pulled together and twisted to z 328 T/M, and then dyed with a cationic dye without a carrier at normal pressure. After that, apply silicone oil to the string electric switch for 3 minutes.
The needle was applied and stitched to obtain sewing thread for Yu. Table 1 shows the characteristics of the embroidery sewing thread thus obtained and the characteristics of a comparative sewing thread prepared using rayon sewing thread and ordinary cationic dyeable polyester with the same system composition and twist number.

As shown in Table 1, the embroidery sewing thread of the present invention is easier to handle than the comparative sewing thread.

It has excellent workability and very good sewability.

Table 1

Claims (4)

[Claims] (1) Twist coefficient 2.0 for polyester filament yarn
00 to 10,000 de , its strength is 1.8 to 2.6? A polyester sewing thread for embroidery, characterized in that the modulus corresponding to the elongation at break of 80 degrees is in the range of 0.1 to 4 f/d, e. (2) Polyester containing ethylene terephthalate as the main repeating unit is highly oriented melt-spun so that the birefringence Δn of the entire fiber of the spinner is O. The yarn is heated without being actively stretched, and then stretched at a stretching ratio up to the cutting limit of the yarn at a temperature below the secondary transition temperature, resulting in a Bories yarn with a thickness of 50 to 2 U Ode. Delphi iramen; - Twisted yarn If (2,000 to 10,000
After first twisting at step 9 to make a single yarn, the total denier is 100~
2 to 7 of the single yarns are combined so that the yarn is 400 DEG, and a final twist is applied in the opposite direction to the first twist, and then the temperature is 90°C to 1
A method for producing polyester sewing thread for stitching (7), which is characterized by heat treatment at 30°C. (3) The method according to claim 2, wherein the polyester has as a main repeating unit ethylene terephthalate copolymerized with a 5-sodium sulfoisoheptalate component. (4) After spinning a polyester whose main carryover unit is ethylene terephthalate copolymerized with a 5-sodium sulfoisophthalate component, the birefringence Δn of the entire fiber is 0.
Highly oriented melt-spun to give an ILc of 025 or more, then heated without winding to crystallize it to a crystallinity of 32 or more, and then continuously stretched at a high temperature of 150°C or more. Polyester filament yarn with a thickness of 50 to 200 degrees and a twist coefficient of 2,000 to 10,0
After first twisting with 00 to make a single yarn, the total denier is 100.
2 to 7 of the single yarns are combined so that the length is ~40'Ode,
Perform a final twist in the opposite direction to the first twist, and then heat at a temperature of 90°C to 1
Polyester sewing thread for embroidery that is heat treated at 30℃? ! ! Construction method.