JPH0411038A - Machine sewing thread - Google Patents

Abstract

PURPOSE:To obtain the title machine sewing thread useful as machine sewing thread of high-speed rotation, having excellent sewing properties, slight occurrence of fly waste, capable of carrying out sewing room operation, by twisting specific polyester multifilament yarn with polyester spun yarn. CONSTITUTION:Polyester multifilament yarn having 2.0-3.5 twist multiplier of first twist is twisted with polyester spun yarn having the same first twist direction as that of the filament yarn, 2.3-3.5 twist multiplier of first twist, ply twist direction opposite to that of the first twist, 1.3-3.3 twist multiplier of ply twist and 150-350 fuzzes/10m fluff coefficient in >=1mm fuzzes to give the objective machine sewing thread.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-quality polyester sewing thread that has excellent sewability and generates little fluff.

(Conventional technology and its problems) Polyester sewing thread has the characteristics of high strength, uniform quality, and excellent color fastness, and as sewn products are increasingly made of polyester, it has recently become a substitute for cotton sewing thread. We are increasing our market share.

In particular, polyester filament thread has a higher level of uniformity, which makes the stitches more beautiful than polyester spun thread, but when sewing with polyester filament thread on a sewing machine that rotates at high speed, There is a problem in that the friction causes the sewing machine needle to reach a high temperature, which melts the polyester filament thread and reduces its sewability.

On the other hand, polyester spun sewing thread has a large surface area due to the presence of fluff, and has a heat dissipation effect, so it has excellent heat resistance, but it is slightly less strong than polyester filament yarn, and also has a Young's modulus and fluff generation. There are disadvantages such as poor passageability of a sewing machine needle due to the sewing machine, and when sewing is performed with a sewing machine that rotates at high speed, there is also a problem that the sewability is reduced.

In order to solve these problems, Japanese Patent Laid-Open No. 6183338 proposes a polyester core yarn sewing thread in which a polyester filament is used as a core yarn and a polyester spun is used as a sheath yarn.

However, there was a problem in that a special process was required to manufacture the core yarn, which increased the manufacturing cost.

The present inventors have completed the present invention as a result of extensive research into sewing threads that are particularly suitable for high-speed rotating sewing machines. To provide a sewing thread that does not generate cotton and can be sewn with high efficiency.

(Means for solving the problem) The above-mentioned object is a sewing thread made by twisting and twisting a polyester multifilament yarn and a polyester spun yarn,
The twist coefficient of the first twist of the polyester multifilament yarn is 2.0 to 3.5, and the twist direction of the first twist of the polyester multifilament yarn is the same direction as the first twist of the polyester multifilament yarn, and The twist coefficient is 2.3~3
．． 5, the twist direction of the first twist is opposite to the first twist, the twist coefficient of the first twist is 1.3 to 3.3, and the fuzz index is in the range of 150 to 350/10m with a fuzz of 1 mm or more This is achieved by a polyester sewing thread characterized by:

In the present invention, the twist coefficient is a coefficient expressed by = T/f (K: twist coefficient, Tri: number (twice/2.54 cm), N: English cotton count), and the fuzz index is a number This is a value measured with an F-index tester manufactured by Shinbobo Co., Ltd.

The present invention will be explained in detail below.

The polyester fiber used in the present invention is 90% by weight.
Preferred examples include polyethylene terephthalate. The weight percentage of the polyester spun yarn in the sewing thread is preferably in the range of 20 to 80% by weight, and particularly preferably in the range of 30 to 70% by weight.
If it is less than 0% by weight, there will be less fluff, resulting in poor heat resistance.
If it exceeds 80% by weight, there will be a lot of fuzz and the sewing machine needle 111
This is undesirable because the stitchability becomes worse and the occurrence of fly fluff increases, resulting in a decrease in sewability.

In the present invention, it is necessary to set the twist coefficient K of the first twist of the polyester multifilament yarn to 2.0 to 3.5, and if the first twist coefficient is less than 2.0, when the first twist is applied, , the force of trying to return the yarn in the direction opposite to the twisting direction causes it to become torn, resulting in poor sewability. In addition, if the final twist coefficient is 3.5, if the final twist is applied, the residual twisting force will cause it to twist in the same direction as the twisting, resulting in a kinky shape, which will reduce the strength and deteriorate the sewability. So I don't like it.

In addition, the twist coefficient K of the first twist of polyester spun yarn is 2.3.
-3.5, if the ply twist coefficient is less than 2.3, the occurrence of fluff due to slippage due to the friction of the fluff of the polyester fiber will be large; if it exceeds 3.5, the fiber The binding force is large, and if an impact force due to friction is applied to the fluff, the fluff will break and the fluff will decrease, resulting in poor heat resistance, which is undesirable.

Further, when a polyester filament yarn having the above twist coefficient and a polyester spun yarn having the above twist coefficient are combined and twisted, the twisting direction of the first twist is opposite to that of the first twist, and the twist coefficient K of the first twist is set to 1.
3 to 3.3, and if the twist direction of the top twist is the same as the twist direction of the bottom twist, the force that tries to return in the opposite direction to the twist direction will work when the top twist is applied, causing a state of failure. If the twist coefficient is less than 1.3, the occurrence of fluff due to the fluff of the polyester fiber slipping through due to friction (if it exceeds ,3,3, the twisting coefficient is less than 1.3). This is not preferable because the torque is large and the thread becomes loose, which impairs the sewing properties.

Furthermore, 150 to 350/10 with fluff of 1 mm or more
It is necessary to have a fluff index in the range of m, and if the fluff index is less than 150/10 m, the heat dissipation effect will be reduced.
As the temperature of the sewing machine needle increases, the sewability becomes poor, and on the other hand, when the fuzz index exceeds 350/10m, the passage of the sewing machine needle becomes poor and the sewability deteriorates.

(Example) The present invention will be described in detail below based on examples.

70 denier/24 filament (English cotton count 76s)
Polyester spun yarn made by heating polyester multifilament yarn with SL and polyester staple fiber bundle (1.25 denier, 38 mm equal length cut) spun to English cotton count 65S with S twist using normal cotton spinning method. was used. Two polyester multifilament yarns and one polyester spun yarn are aligned in the Z direction or S direction.
Sewing thread was created by twisting and heating while heating in the direction. Sewing threads were also prepared by aligning one polyester multifilament yarn and two polyester spun yarns and twisting them while heating in the Z direction or S direction. At this time, the ply twist coefficient of the polyester multifilament yarn, the ply twist coefficient of the polyester spun yarn, the ply twist direction, and the ply twist coefficient were changed as shown in Table 1.

The obtained yarn is dyed with disperse dye using a cheese dyeing machine at 130°C.
The fabric was dyed for 100 minutes, and 3% by weight of an oil ring mainly composed of silicone was added to the weight of the sewing thread to obtain a sewing thread.

The obtained sewing thread has a fuzz index (measured with the F-index tester mentioned above) of 9 strength (measured with an automatic single thread strength measuring device 5T-20OR spun several items), and a state of occurrence of fluff (×... wind Severe occurrence of cotton, Δ... Normal occurrence of fluff, ○
...Small amount of fluff) and sewability (×...Poor, △・
As is clear from Table 1 in which the sewing threads according to the examples of the present invention were evaluated as ``fair'', ○...good), the sewing threads according to the examples of the present invention did not generate fluff, had excellent sewability, and had no problems with strength. I understand that.

(Effect of the invention) As described above, the sewing thread formed by twisting the polyester multifilament yarn and the polyester spun yarn of the present invention is
It is extremely useful because it produces less fluff, has excellent sewability, and is strong.

Furthermore, since the sewing thread of the present invention is not made of core yarn or the like, but is simply twisted and twisted, it can be easily manufactured and can be provided at low cost.

Claims (1)

[Claims] (1) A sewing thread made by combining and twisting a polyester multifilament yarn and a polyester spun yarn, wherein the twist coefficient of the first twist of the polyester multifilament yarn is 2.0.
~3.5, the twist direction of the first twist of the polyester spun yarn is the same direction as the first twist of the polyester multifilament yarn, and the twist coefficient of the first twist is 2.3 to 3.5, and the twist coefficient of the first twist is 2.3 to 3.5, and The twist direction is opposite to that of the first twist, the twist coefficient of the first twist is 1.3 to 3.3, and the fuzz index is in the range of 150 to 350/10 m with a fuzz of 1 mm or more. polyester sewing thread.