JPH06128834A - Spun machine sewing yarn - Google Patents

Abstract

PURPOSE:To provide spun sewing yarn which has excellent sewability in a variety of sewing machines with reduced fluff-falling during the sewing, and can prevent the formation of puckering by making the yarn finer. CONSTITUTION:The machine sewing yarn is composed of several filaments having primary twists where at least one to (n-1) filaments are made of filaments (A) of high strength and low elongation as a matrix and filaments (B) of high elongation, 20 to 150% higher than that of the filaments (A), while the other remaining at least one to (n-1) filaments is made of filament of less than 10% difference in the elongation from that of filaments (A) and further, a part of the filaments B form the loops or sag on the yarn surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spanize sewing thread, and more particularly to a spanize sewing thread in which the elongation of a filament forming a loop or slack in the surface layer of the sewing thread is higher than that of a matrix filament. .

[0002]

2. Description of the Related Art Conventionally, as a sewing thread, a cotton sewing thread, a silk sewing thread, a synthetic fiber sewing thread and the like have been used. In recent years, synthetic fiber sewing threads have been widely used from the viewpoints of strength and dyeing fastness, and particularly polyester filament sewing threads and polyester stitch sewing threads have become the mainstream. The polyester filament sewing thread is excellent in terms of uniformity and strength, but it is inferior in heat resistance and therefore not only high-speed sewability but also untwisted easily and poor in back sewability. On the other hand, polyester suphumi sewing thread has excellent high-speed sewability and back sewability because the fluff improves heat resistance and prevents untwisting, but it is inferior in uniformity and fluff occurs during sewing. It has the drawback of falling out.

[0003] As a sewing thread which has improved the drawbacks of the polyester filament sewing thread and the polyester suphumi sewing thread, for example, Japanese Patent Publication No. 62-38457 discloses.
A core yarn sewing thread has been proposed in which polyester flament is a core component and polyester suf is a sheath component. In addition, Japanese Patent Publication No. 51-136947 proposes a bulky yarn sewing machine yarn in which a synthetic fiber multifilament yarn is bulky entangled to raise the surface layer.

These sewing threads are certainly improved in terms of uniformity, heat resistance, and prevention of untwisting. However, in any case, since it has loops and fluffs, sewing with these sewing threads causes the loops and fluffs to cut and fall off due to the tension and friction received by the sewing threads, Adheres to needles, shuttles, pressers, etc. The attached fluff has a fatal defect that the sewing oil is soaked and contaminates the sewn object through the sewing thread passing through the fluff, and further, it is widely used because of the high processing cost. Not in.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to improve the above-mentioned drawbacks of the conventional sewing thread, to have excellent sewability on various sewing machines, and to prevent fluff from coming off during sewing, and It is to provide a sewing thread that can prevent the occurrence of puckering by making the thread into a fine count.

[0006]

According to the present invention, there is provided a sewing thread composed of a plurality of (n) single yarns having undertwist, wherein at least one or more of the single yarns ( n-
1) The following single yarn has a high tenacity / low elongation filament (A) as a matrix, and a high elongation filament (B) having an elongation 20 to 150% higher than that of the matrix filament (A). , 5 to 45 for sewing thread
On the other hand, at least one or more (n-1) or less of the remaining single yarns made of a single fiber mixed by weight% has an elongation difference of 10% or less with respect to the matrix filament (A). Provided is a spanish sewing thread, which is composed of a single thread composed of filaments and in which a part of the high elongation filament (B) forms a loop or a slack in the surface layer of the sewing thread.

The sewing thread of the present invention comprises a single filament in which a high-strength, low-elongation matrix filament (A) is mixed with a high-elongation filament (B) forming a loop or slack, and the matrix filament ( It consists of a single yarn composed of filaments having an elongation difference of 10% or less from that of A).

The matrix filament (A) is a matrix component of the sewing thread, and imparts strength, elongation and other characteristics required for the sewing thread. That is, it is desirable that the matrix filament (A) has higher strength and lower elongation, but in view of technical and cost,
Strength is about 4.0 to 9.0 g / de, elongation is 10 to 40
% Is appropriate. Since the sewing thread is required to have an appropriate bending rigidity, the denier of the single fiber is 2 to 6 de.
It is preferably about the same. Further, since the sewing thread requires various counts, it is not possible to limit the denier of the single thread, but generally 50 to 300 denier is used. A polyester filament is preferably exemplified as one satisfying such characteristics.

On the other hand, the high elongation filament (B) is a component that forms a loop or a slack in the surface layer of the sewing thread, and its elongation is the matrix filament (A).
It is extremely important that the elongation is 20 to 150% higher than the elongation.

The sewing thread has a tension (300 to 80) during sewing.
It is said to be 0 g), but it is subject to friction and the like, but these are strongly affected by the loop and slack that are raised from the base of the sewing thread. As a result, the monofilaments forming loops and sags are easily cut and fallen off. As a method of avoiding this phenomenon and preventing the fall of fluff (which contaminates the sewn object as described above), it is easy for anyone to increase the strength of the single fiber. is there. However, there is a limit to increase the strength of each extremely thin single fiber, and it is extremely difficult to realize the strength that can withstand the tension and friction that the sewing thread receives.

With respect to this point, as a result of intensive studies by the present inventors, the conventional knowledge that the fiber used for the sewing machine thread has high strength and low elongation is overturned, and in the case of the sewing machine thread of the present invention, the filament Only in (B), it has been found that a high elongation is preferable. That is, by making the elongation of the filament (B) higher than that of the matrix filament (A), the high elongation filament (B) is elongated even when the sewing thread is stretched under tension. It does not cut before the matrix filament (A), and practically hardly cuts it.

Matrix filament (A)
Is disposed at the core of the sewing thread, is less susceptible to tension and friction, and has high strength, making it difficult to cut.
Further, even if the sewing thread is locally subjected to tension or friction, the elongation of the high-elongation filament (B) absorbs them, and even if they are elongated, they are very rarely cut. In addition, the fibers with high elongation are resistant to abrasion and difficult to cut by abrasion.

In order to bring out such an effect, the elongation of the high elongation filament (B) needs to be 20% or more higher than that of the matrix filament (A). However, the elongation of the high elongation filament (B) is
If it is higher than the elongation of the matrix filament (A) by more than 150%, an abnormally large loop or slack is generated due to the tension or friction received during sewing, and the seam appearance of the sewn product is impaired. Appropriate.

The monofilament denier of the high elongation filament (B) is preferably small to form a loop or slack and large to prevent the fluff from falling off during sewing, but usually it is a technique. In terms of cost and cost, 1-3
Denier is suitable. Moreover, although the strength of the high elongation filament (B) has never been high, it is not an essential requirement that the strength be high, and the purpose can be achieved at about 1 to 3 g / de. And as a thing satisfying such a characteristic, a polyester filament undrawn yarn and a low draw ratio yarn are illustrated suitably.

In the sewing thread of the present invention, the mixing ratio of the high elongation filament (B) to the sewing thread must be in the range of 5 to 45% by weight. The high elongation filament (B) is a component that forms loops and slack in the sewing thread and contributes to improvement of heat resistance and prevention of untwisting. If the amount is less than 5% by weight, the effect is I can't get it. On the other hand, if the amount is too much and exceeds 45% by weight, the proportion of the matrix filament (A) becomes small and the high tenacity and the low elongation required for the sewing thread cannot be obtained.

The sewing thread of the present invention is composed of a plurality of (n) single yarns having an initial twist. At this time, at least one or more (n-1) or less single yarns out of the n single yarns are composed of the matrix filament (A) and the high elongation filament (B), and the remaining at least The single yarn of 1 or more (n-1) or less consists essentially of filaments having an elongation of 10% or less with respect to the matrix filament (A), and does not include the high elongation filament (B). It is a thing.

When the elongation difference exceeds 10%, when tension is applied to the sewing thread, the stress concentrates on only one of the filaments and the cutting of the sewing thread occurs. Further, the filament having an elongation difference of 10% or less from the matrix filament (A) includes the matrix filament (A) itself.

That is, the present invention makes it possible to provide a fine count sewing thread by mixing the high elongation filament (B) in only a part of the single threads.

The above reason will be described in more detail. In order to obtain a fine count sewing thread, the denier of the single thread constituting the sewing thread must be reduced. However, the smaller the denier of the filament, the worse the productivity during filament production, the higher the cost, and the more difficult it becomes to handle in the sewing thread processing step. Therefore, there is a limit to making the filament fine denier. It is more difficult to make fine denier of a single yarn that is a mixture of two types of filaments. If you mix the high elongation filament (B) into all the single yarns,
A fine count sewing thread cannot be obtained, and the object of the present invention cannot be achieved. That is, by mixing the high elongation filament (B) only in a part of a plurality of single yarns, it is possible to make the sewing yarn finer.

In the present invention, the denier of the single yarn in which the matrix filament (A) and the high elongation filament (B) are mixed is preferably larger than the denier of the single yarn not including the high elongation filament (B). . With this configuration, it is possible to make the sewing thread finer.

For example, matrix filament (A)
And denier of the high-elongation filament (B) are respectively D, a single filament obtained by mixing the matrix filament (A) and the high-elongation filament (B) is not included, and the high-elongation filament (B) is not included. The denier of a twin (consisting of two single yarns) sewing yarn constituted by one single yarn consisting only of the matrix filament (A) is about 3D.
On the other hand, when both the single yarns are both the mixed filament yarn of the matrix filament (A) and the high elongation filament (B),
The denier of the sewing thread is about 4D, and the former sewing thread is finer by about 1D (1/4).

Further, in the present invention, when the denier of the single yarn in which the matrix filament (A) and the high elongation filament (B) are mixed is larger than the denier of the single yarn not containing the high elongation filament (B). , Number of ply twists of single yarn in which matrix filament (A) and high elongation filament (B) are mixed (generally S direction in case of sewing thread)
Is preferably less than the number of lower twists of a single yarn not containing the high-elongation filament (B) and less than the number of upper twists (generally in the Z direction in the case of a sewing thread). With such a twisted structure, the denier difference between the two single yarns is balanced as an apparent thickness, and the appearance of the sewing yarn becomes good. The actual number of twists is not particularly limited, but it is preferable that the number of lower twists be a value that is roughly proportional to the denier of each single yarn.

The sewing thread of the present invention has a loop or slack in the surface layer, but the shape thereof is not particularly limited. Generally, the apparent diameter of the sewing thread is 0.2 to
It is preferable that about 1.0 times the number of loops or slacks that are lifted are present.

The method for forming the loop or slack of the sewing thread of the present invention is not particularly limited. For example, when the matrix filament (A) and the high elongation filament (B) are aligned and twisted, a tension difference between the two filaments,
Matrix filament (A) by giving feed difference etc.
A method of forming a loop or slack by lengthening the filament having a higher elongation (B) to produce a yarn length difference (preferably about 0.5 to 10%), a method generally called a two-feed Taslan, The feed amount of the high elongation filament (B) is larger than that of the matrix filament (A),
A method of forming a loop or a slack, by making the heat shrinkage of the matrix filament (A) larger than that of the high elongation filament (B), and utilizing the heat during the processing step of the sewing thread (for example, the dyeing temperature during dyeing). Cause a contraction difference,
A method of forming a loop or a slack is preferably used.

[0025]

The spanize sewing thread of the present invention is a single thread containing neither the matrix component filament (A) nor the high elongation filament (B).
The high elongation filament (B) that functions to maintain the elongation and bending rigidity and forms a loop or slack in the surface layer of the sewing thread is a matrix against the tension, friction, untwisting, etc. received during sewing. It acts to protect the filament (A).

Furthermore, the spanner sewing machine thread of the present invention is
By mixing the high-elongation filament (B) forming a loop or slack in the surface layer of the sewing thread only in a part of the single thread constituting the sewing thread, and reducing the usage rate of the mixed single thread. Enables finer count sewing thread.

When the high elongation filaments (B) are mixed in only some of the single yarns, the appearance of the sewing yarn is deteriorated due to the denier difference between the individual single yarns. However, by making the number of undertwisting of the single yarn mixed with the high-elongation filament (B) smaller than the number of undertwisting of the single yarn not including the high-elongation filament (B) and less than the number of uppertwist. Enables finer thread count of the sewing thread without spoiling the appearance of the sewing thread.

That is, only the thick denier single yarn in which the matrix filament (A) and the high-elongation filament (B) are mixed is untwisted when the upper twist (the direction opposite to the lower twist) is applied. After being twisted, only the difference between the number of lower twists and the number of upper twists is twisted in the upper twist direction, and the single yarn is tightened and becomes thin. On the other hand, the single yarn not containing the high-elongation filament (B) is almost untwisted because the difference between the number of lower twists and the number of upper twists is small when the upper twist is applied, resulting in a nearly non-twisted state. Don't
As a result, the denier difference between the two single yarns is balanced as the apparent thickness, and the appearance of the sewing yarn is improved.

[0029]

The present invention will be described in more detail with reference to the following examples.

[0030]

Examples 1 to 3 and Comparative Examples 1 and 2 1. Filament production (1) Polyethylene terephthalate having an intrinsic viscosity [η] = 1.0 was spun at a spinning speed of 2500 m / min, and then 85
Using a heating roller at ℃, stretched 2.4 times to 50d
A high strength (7.0 g / de), low elongation (17%) polyester filament (A) having e / 24 fil was obtained. (2) In Example 1 and Comparative Example 1, the intrinsic viscosity [η] = 0.
Polyethylene terephthalate of No. 6 was spun at 2500 m / min, stretched at a low draw ratio, and had an elongation shown in Table 1.
A polyester filament (B) having a de / 24 fil was obtained. In Examples 2 and 3 and Comparative Example 2, the polyethylene terephthalate was spun at various spinning speeds,
A polyester filament (B) of 50 de / 24 fil having the elongation shown in Table 1 was obtained.

2. Manufacture of single yarn (1) 3% of each polyester filament (B) in Table 1
Over-feeding, polyester filament (A) was mixed with 0.5% over-feed, and 58 entangles / m were entangled under the condition of air pressure of 1.0 kg / cm @ 2 using an air interlace nozzle. 40 for each thread
A twist of 0 T / m (S direction) was applied to obtain each single yarn (a) having loops and slack in the surface layer portion. (2) 900 T / m on polyester filament (A)
Twisting in the (S direction) was performed to obtain a single yarn (b).

3. Manufacture of sewing thread 700 T / m by aligning single yarn (a) and each single yarn (b)
After the yarn obtained by twisting in the (Z direction) is dyed like cheese (130 ° C x 60 minutes), 3.0% of a silicon-based oil for sewing machine threads is applied to produce each sewing thread. did. Table 1 shows the evaluation results of the obtained sewing threads.

[0033]

[Table 1]

The high-speed sewability of the sewing machine threads shown in Tables 1 and 2 is as follows.
When four pieces of T / R surge were sewn with the sewing machine needle # 14 and the cutting of the sewing thread occurred frequently, it was indicated by x, and when it was not cut at all, it is indicated by o. Further, ○ ^- shows that very little cutting has occurred. Back stitch sewability is one when a T / R surge is sewn 30 cm in the back direction with a sewing machine needle # 11 at a speed of 2000 rpm with a sewing machine needle of 1 needle, and the sewing thread is frequently cut. When not cut at all, it is indicated by ○. Further, ○ ^- shows that very little cutting has occurred.

For puckering, a single-needle sewing machine with a lock stitch is used, and one T / C broad is sewn with a sewing machine needle # 11 at a speed of 3500 rpm. Is indicated by x.

The fall of fluff was indicated by x when the hook portion of the sewing machine was cleaned and then 20 m was sewn under the same conditions as the high-speed sewing property, and when the degree of fluff adhesion on the hook portion was large, it was indicated by ◯.

Regarding the appearance of the seams, when a sewn fabric sewn under the same conditions as the high-speed sewability was observed, a good condition was indicated by ◯, and a bad condition was indicated by x. The ○ ^- shows that is somewhat poor.

As shown in Table 1, Examples 1 to 1 according to the present invention
The sewing thread of No. 3 has a fine count and is excellent in high-speed sewability, back sewability, less occurrence of puckering, fluffing, and good appearance of seams.

On the other hand, when the elongation difference between the filament (B) and the filament (A) is less than 20% (Comparative Example 1), the fluff is often dropped due to the breakage of the filament forming the loop or slack. . On the contrary, when the difference in elongation exceeds 150% (Comparative Example 2), the loop and the slack are abnormally stretched during sewing, and the appearance of the seam is deteriorated.

[0040]

Example 4 Polyethylene terephthalate having an intrinsic viscosity [η] = 1.0 was spun at a spinning speed of 2500 m / min instead of the filament (A) in Example 2, and then 8
Obtained by stretching 2.4 times using a heating roller at 5 ° C.,
Example 2 was carried out in the same manner as in Example 2 except that filaments of 50 de / 24 fil and 20% elongation (22% elongation after dyeing cheese) were used to obtain the single yarn (b).

[0041]

[Examples 5 and 6 and Comparative Examples 3 to 5] In Example 2,
The mixing ratio of the filaments (A) and the filaments (B) was changed as shown in Table 2 (the denier of each filament was changed so that the total denier of both filaments was 100 de). Sewing threads were prepared in the same manner as in 2 and evaluated. In Comparative Example 5, a sewing thread was prepared and evaluated in the same manner as in Example 4, except that two single yarns (a) of Example 2 were aligned and twisted. The results are shown in Table 2.

[0042]

[Table 2]

As shown in Table 2, the sewing threads of Examples 5 and 6 according to the present invention have a fine count and are excellent in high-speed sewability and back sewability, and are less likely to cause puckering and fall off of fluff.
Although the appearance of the seam is also good, when the content of the filament (B) is less than 5% (Comparative Example 3), the effect of the present invention is not obtained, and the high-speed sewability and the back sewability are poor. bad. Conversely 45
If it exceeds 0.1% (Comparative Example 4), the high tenacity and the low elongation required for the sewing machine thread cannot be obtained, and the high-speed sewing property is deteriorated. Further, in Comparative Example 5, since all the single yarns that compose the sewing machine thread include the filament (B), the sewing machine thread does not have a fine count, the puckering is defective, and the filament (B) is mixed. Too high a ratio, the strength of the sewing thread is low,
Poor sewability.

[0044]

[Example 7] A sewing thread was prepared in the same manner as in Example 2 except that the number of twists of the single yarn (a) containing the filament (B) was 900 T / m (S direction). ,evaluated. Single yarn (a) (large denier) containing filament (B) forming a loop or slack, and single yarn (small denier) not containing filament (B) have the same number of lower twists and the same number of upper twists Since it was more, the twist structure could not be balanced, and the high-speed sewability, the back sewability and the seam appearance were slightly inferior to those of Example 2.

[0045]

According to the present invention, it is possible to provide a sewing thread which is excellent in sewability, has less fluff coming off during sewing, can be made into a fine count, and has less puckering.

Claims (3)

[Claims] 1. A sewing thread composed of a plurality of (n) single yarns having undertwisting, and at least one or more (n-1) or less single yarns among the single yarns. The high-strength, low-elongation filament (A) is used as a matrix, and the high-elongation filament (B) having an elongation of 20 to 150% higher than that of the matrix filament (A) is 5 to the sewing thread. On the other hand, at least one or more (n-1) or less single yarns composed of 45% by weight of mixed filaments,
10% difference in elongation from the matrix filament (A)
A spanish sewing machine comprising a single yarn composed of filaments having the following elongation, and a part of the high elongation filament (B) forms a loop or a slack in the surface layer of the sewing thread. yarn. 2. The spanish sewing thread according to claim 1, wherein the denier of the single yarn containing the high elongation filament (B) is larger than the denier of the single yarn not containing the high elongation filament (B). 3. The number of lower twists of the single yarn containing the high elongation filament (B) is less than the number of lower twists of the single yarn not including the high elongation filament (B) and less than the number of upper twists. The spanish sewing thread according to claim 2.