JPS61102445A - Polyester filament yarn for sewing machine - 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 [Technical Field] The present invention relates to a novel polyester filament yarn for sewing thread. More specifically, in order to obtain high-quality sewing thread by streamlining the σ process and stabilizing the processing of sewing thread manufacturing.

It concerns a specific polyester filament yarn.

[Prior art and its problems]

Sewing thread made of polyester filament thread has many excellent properties and is used in a wide variety of applications, and is being used in a wide range of applications. Therefore, as polyester filament thread for sewing thread, it is used in a variety of applications. It has been desired to streamline the processing process, in particular to eliminate the heat setting process, and to maintain dimensional stability in order to suppress skipped stitches and shrinkage of sewn products during sewing.

Furthermore, there has been a desire for a high-quality sewing thread that maintains strength that can be widely used for industrial and household purposes, has a good texture, and has an appearance with particularly suppressed uneven twisting.

In addition, the processing process of sewing thread made of polyester filament yarn is complicated; for example, raw yarn → raw yarn winding process → first twisting process → doubling process → final twisting process → heat setting process → dyeing process →A processing process consisting of rolling and packaging processes is adopted. Because it goes through many processes like this.

There has been a strong desire for a raw yarn that is suitable for streamlining processing processes and for a variety of processing processes, has good workability, and, for example, does not cause uneven twisting.

By the way, the conventional polyester filament yarn has 1
Although the strength was maintained high, the wet heat shrinkage rate was as high as about 10 cm, so when processed in the sewing thread processing step described above, the physical properties and thread length changed unfavorably. In particular, this not only makes it difficult to set the twisting conditions during the processing process, but also requires a heat-setting process to maintain the dimensional stability of the sewing thread. However, when trying to maintain dimensional stability, strength is sacrificed, and the strength is insufficient to prevent thread breakage during processing or sewing.

In order to solve these problems, for example, JP-A-50-9
No. 0742, JP-A-50-126917, Q
Publication No. 54-1825 proposes a polyester filament yarn with high strength and a wet heat shrinkage rate of 3% or less. but.

Although these yarns can omit the heat setting step in the sewing thread processing process, uneven twisting tends to occur during processing, and the level of production efficiency and quality of the final sewing thread product is not fully satisfactory.

The present inventors have conducted various studies regarding such causes.

■ The omission of the heat setting process is due to the wet heat shrinkage rate of each yarn and the dry heat shrinkage rate measured continuously within one yarn being too high.■ Regarding the occurrence of twist unevenness, the above shrinkage rates are low Too much,
The present inventors have found that the cause of this is that the rate of variation in the wet heat shrinkage rate between each yarn and the rate of variation in the dry heat shrinkage rate within one yarn are too high. Therefore, the present inventors et al. arrived at the present invention as a result of intensive studies on the appropriate shrinkage rate and rate of change in shrinkage rate while maintaining the strength required for sewing thread.

[Purpose of the invention]

In other words, an object of the present invention is to solve the above-mentioned problems all at once by streamlining the sewing thread processing process by making it possible to omit the heat-setting process, and by suppressing uneven twisting that occurs during sewing thread processing, thereby creating a stable Our goal is to provide polyester filament yarn that can be processed.
[Structure of the Invention] Namely, one object of the present invention is to make the intrinsic viscosity [η] of each thread 0.55 or more and the breaking strength 5.0 g in a plurality of polyester filament threads constituting a sewing thread.
/de or more, and the following shrinkage rates S4 and S of each yarn
2 and the following shrinkage rate fluctuation rate ΔSI + Δ82 (hereinafter referred to as fluctuation rate ΔSitSi rate ΔS2) (11 to (4)
This is achieved by using a polyester filament yarn characterized by a range of formula.

3.5≦81≦7.0 ・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・ (1) 3.5≦82≦
7.0 ・・・・・・・・・・・・・・・・・・・・・
...... (2) ΔS, ≦5.0 ...
・・・・・・・・・・・・・・・・・・・・・・・・
... (3) ΔS2≦5.0 ...
・・・・・・－・・・・・・・・・・・・・・・・・・
(4) However, S: 0130℃ wet heat shrinkage rate of each yarn (%) S2: 180℃ dry heat shrinkage rate of each yarn (correspondence) ΔS1: Fluctuation rate of Sl between each yarn (correspondence) ΔS2: 1 Variation rate of S2 within the yarn (correspondence) Below 1 Describe the present invention in more detail 0 The polyester filament yarn for sewing thread of the present invention is obtained by melt-spinning a polyester containing 95 moles or more of polyethylene terephthalate units. It is something that was given. The main target of such polyester is polyethylene terephthalate, but polyethylene terephthalate units are 9
Copolymerized polyester containing 5 mole or more, matting agent,
Polyesters containing additives such as coloring pigments and stabilizers in an amount of 5 molar or less, or polyesters mixed with 2% by weight or less of other polymers based on the basic properties of the polyethylene terephthalate may also be used.

The polyester filament yarn for sewing thread of the present invention is
The intrinsic viscosity [a] determined from the value measured at 25°C after dissolving in an ornochlorophenol solution to a concentration of 0.1 g/cc must be 0.55 or more. This is because when the intrinsic viscosity [a is less than 0.55, the breaking strength decreases.

The breaking strength of the polyester filament yarn for sewing thread of the present invention is required to be 5: Og/de or more.

Breaking strength 95. This is because if it is less than Og/dθ, thread breakage occurs during sewing thread processing or sewing, causing a problem that reduces production efficiency. The breaking strength here refers to the temperature of the sample at 20°C.
, 1/min by Tensilon tensile tester at 65% RH.
2 (This is the value obtained by dividing the cutting strength when pulled at a speed of 1% by the fineness before the test.

Furthermore, the polyester filament yarn for sewing thread of the present invention has a shrinkage rate S measured by the measuring method described below,
and S2 are both 3.5 to 7.0%.

Both fluctuation rates ΔS1 and ΔS2 need to be 5% or less.

If the shrinkage rate FN+82 is less than 3.5, uneven twisting is likely to occur during sewing thread processing, and 7. This is because if it exceeds 0%, not only the thermal dimensional stability will deteriorate and the workability of the sewing thread will not be stable, but also the heat setting step cannot be omitted. From the point of view of completely preventing the occurrence of twist spots, it is preferable that the lower limit of the shrinkage rate 5IbS2 is 4.0q6 or more. The shrinkage rate is measured at a fine pitch (for example, 5 pitches/cm) for any length within the thread, but the specific value of this shrinkage rate is based on factors such as uneven twisting of sewing thread. This is because the continuous shrinkage rate is involved in the longitudinal direction of the filament yarn, which is the raw yarn.

Further, the fluctuation rate ΔS1. If both ΔS2 exceed a factor of 5.0, uneven twisting occurs during sewing thread processing, which not only significantly reduces production efficiency, but also causes unsatisfactory quality of the final sewing thread product. In order to further improve the quality of sewing thread products, it is preferable to set the upper limit of each variation rate ΔS1 and ΔS2 to 4.0.

Here, each shrinkage rate 81 S2 and each fluctuation rate ΔS1 defined in the present invention are calculated. The method for measuring ΔS2 will be explained.

The shrinkage rate S, for each yarn, is calculated from the sample length t after obtaining a sample of length 4 and subjecting the sample to a moist heat treatment at 130°C for 30 minutes under no tension, ((4-1,)/l, ) This is the value obtained by multiplying by 100%.

The shrinkage rate S2 is determined by supplying yarn of arbitrary length with a supply roll at a constant circumferential speed, and between the supply roll and a take-up roll whose tension is controlled to be constant.

Continuous heat treatment is performed at 180° C. under constant tension of 2 x i 0-2 g/de. Then, from the circumferential speed A of the supply roll and the circumferential speed B of the take-up roll during the heat treatment, ((A-B)/A)X1
This is a value obtained continuously at 00%. For the measurement of the shrinkage rate S2, for example, the rPTA-500 system manufactured by Toshiba Co., Ltd. is preferably used.

Both the fluctuation rate ΔS1 and the fluctuation rate ΔS2 are each contraction g s
,, Find the average value X and sigma σ from the measured values of s2 ()
Find it using the X100 section.

On the other hand, it is necessary that the polyester filament yarn for sewing thread of the present invention has all of the above-mentioned physical properties, but the yarn of the single yarn constituting the yarn must be 5 de or less, and the number of single yarns is 8. It is desirable to have at least one book. Furthermore, the cross section of the single yarn can be not only circular but also irregular.

The above-described specific polyester filament yarn can be industrially advantageously produced by the following method.

Intrinsic viscosity [
The undrawn filament yarns with η] of 0.55 or more are first heated at 70 to 100'C in a drawing heat treatment apparatus in which the surface temperature of the heated roller is controlled within the range of ±3°C, preferably ±2°C. .

Feed port heated to preferably 80-95°C - 70°C
Stretched to 1.4 to 4.0 times with a first stretching roller heated to ~120°C, preferably 80 to 110°C, and then stretched to 80°C.
Stretching is carried out between second stretching rollers heated to 190 to 240 °C, preferably 200 to 230 °C, under an ambient temperature of 100 °C or higher, so that the total stretching ratio is 2.5 to 6.0 times, and then the second 10% or less between the stretching roller and the take-up roller at room temperature,
Preferably, a limited contraction of 1 to 8% is performed. The contact residence time on the second stretching roller is 0.03 to 1 second, preferably 0.0
It is 5 to 0.5 seconds.

In this method.

■ Use a heated roller whose surface temperature is controlled within the range of ±3℃, preferably ±2℃ ■ Set the ambient temperature near the second stretching roller to 80 to 120℃
■ It is especially important to perform limited shrinkage treatment immediately after heating and stretching at high temperatures. This is because it is possible to obtain a polyester filament yarn with high breaking strength, small fluctuation rates ΔS1 and ΔS2, and appropriate shrinkage rates S4 and S2, which have not been achieved conventionally.

To control the ambient temperature near the second stretching roller,
The simplest method is to provide a box surrounding the stretching roller. That is, the heat dissipation of the stretching rollers is utilized.

Alternatively, if the heat radiation described above does not reach the predetermined temperature,
This should be supplemented by external heating.

〔Effect of the invention〕

In this way, the polyester filament yarn for sewing thread of the present invention has particularly good breaking strength, shrinkage rate S1, S2 i variation rate ΔS1. Since ΔS2 is set within an appropriate range, it is possible to omit the heat senote process in the sewing thread processing process, and furthermore, it is possible to suppress uneven twisting that occurs during sewing thread processing. Therefore, it is possible to save energy, and when processing the sewing thread, it is possible to obtain a good final sewing thread product (i is thicker than the sewing thread obtained by the conventionally known method). The polyester filament yarn for sewing machine light of the present invention enables stable production of sewing thread, and can be used not only for household use but also for industrial purposes, and has extremely high industrial significance.

Examples of the present invention will be described in detail below.

Example 1 Polyethylene terephthalate with a pore diameter of 0.3 m.

A supply roller that heats and controls undrawn filament yarn of intrinsic viscosity [a, y and o] obtained by melt spinning from a spinneret with 24 holes by a conventional method to a surface temperature of 85 ± 2 ° C. The first stretching roller, whose surface temperature is controlled to have a surface temperature of 100±2°C, is applied six times to the second drawing roller, whose surface temperature is controlled to a surface temperature of 220±2°C, in an atmosphere of 100°C under change.
The film was wound around a stretching roller 6 times, and then around a take-off roller at room temperature 4 times, the peripheral speed of the take-up roller was fixed at 800 rn/min, various stretching ratios were set between the supply roller and the second stretching roller, and the second After performing various limited contractions between the stretching roller and the take-up roller, the winding is performed on a spindle-driven winding machine (1).
A drawn filament yarn of 70 de-24fil was obtained. Next, three of the obtained drawn filament yarns were twisted with an hT twist of 900 T/m, and a final twist of 5
00T/m twist to make a 210de-72fil sewing thread, omitting the heat senote process,
Quality and quality after cheese dyeing at 130℃ temperature for 60 minutes
The number of rotations of the needle is 5500 times/min.

The fabric is cotton poo-p', eye a) Finished at 180℃.

Sewing shrinkage of the product after sewing for 20 minutes was evaluated.

These results are shown in Table-1.

Table-1 Evaluation Judgment ×: Problematic ○: Good ◎: Very Good--1 Middle School
and 5 are comparative examples for clarifying the effects of the present invention.

In Table 1, the shrinkage ratio S and S2 of ship 1 are less than the lower limit of 3.5 cm stipulated by the present invention, and the shrinkage ratio 5Ii82 is too low, resulting in uneven twisting due to the influence of the load during sewing thread processing. There are drawbacks that occur.

Since Slow 5 has a shrinkage rate S1 and S2 exceeding the upper limit of 7.0%, it lacks dimensional stability against heat, and has the drawback of poor seam shrinkage especially when ironed.

Electricity 2 to 4 are 3, 5 to 7.0 sections defined in the present invention,
The desired sewing thread was obtained.

Actual #1 Example 2 Sewing thread was obtained under the same conditions as described in Example 1, Example 3, except that the shrinkage processing conditions were variously changed to change the shrinkage rate and its fluctuation rate, and the sewing process was performed to evaluate the sewing shrinkage of the product. did.

These results are shown in Table-2.

Table 2 (Evaluation judgments in the table are the same as in Example 1) Table 2 No. 8 is a comparative example for clarifying the effects of the present invention.

In Table 2, Ryo 8 has fluctuation rates ΔS and ΔS2 exceeding the upper limit of 5.0% stipulated by the present invention, so the fluctuation rates are too large, causing fluctuations in the influence of load during sewing thread processing, and uneven twisting. I could see the shortcomings that occur.

-6 and 7 were 5% or less as specified in the present invention, and desired sewing threads were obtained.

Example 3 Example 1 except for various changes in the intrinsic viscosity [η] and the conditions listed in Table 6. Sewing thread was obtained under the same conditions as N3, and the sewing process was performed to evaluate the sewing shrinkage of the product.The results are shown in Table 3.

Table 3 (Evaluation judgments in the table are the same as in Example 1) Table 9 is a comparative example for clarifying the effects of the present invention.

In Table 3, lI! 19 has a low intrinsic viscosity [η],
Since the strength is low, there is a drawback that thread breakage may occur due to the influence of load during thread processing or sewing. rI&L
In the cases of 10 to 12, [η] regulated by the present invention was 0.55 or more, and the desired min/yarn was obtained.

Example 4 A polyester yarn for Minon yarn was obtained under the same conditions as in Example 1, except that the ambient temperature of the second stretching roller was variously changed.

These results are shown in Table-4.

Table 4 rI&L13 and 17 in Table 4 are comparative examples for clarifying the effects of the present invention.

In Table 4, for the paper 15, the ambient temperature of the second stretching roller is out of the preferred temperature range, so the fluctuation rate ΔSI+
Δs2 became high and the yarn defined in the present invention could not be obtained. In IN&L17, it was difficult to control the ambient temperature, and the fluctuation rate ΔSliΔs2 was slightly high.

In the first 14 to 16 yarns, yarns defined in the present invention were obtained.

Claims (1)

[Claims] In the plurality of polyester filament yarns constituting the sewing thread, each yarn has an intrinsic viscosity [η] of 0.55 or more, and a breaking strength of 5.0 g/de or more, A polyester filament yarn for sewing thread, characterized in that the following shrinkage rates S_1, S_2 and fluctuation rates ΔS_1, ΔS_2 of the following shrinkage rates of each yarn are within the range of formulas (1) to (4). 3.5≦S_1≦7.0………………………………(1)
3.5≦S_2≦7.0………………………………(2)
ΔS_1≦5.0……………………………………(3)Δ
S_2≦5.0………………………………(4) However, S_1: 130°C wet heat shrinkage rate of each yarn (%) S_2: 180°C dry heat shrinkage rate of each yarn (%) ) ΔS_1: Variation rate of S_1 between each yarn (%) ΔS_2: Variation rate of S_2 within 1 yarn (%)