JPH02182934A - Pilling-resistant multifilament yarn and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject yarn having a specific strength and elongation and excellent in pilling resistance by heating part of a false twisting zone with high-temperature steam in false twist texturing a multifilament yarn consisting of polyester-based fibers. CONSTITUTION:A multifilament yarn having a multifilament yarn consisting of polyester-based fibers having 0.025-0.100, preferably 0.025-0.060 birefringence in at least part thereof is false twist textured. In the process, part of a false twisting zone is heated with high-temperature steam to afford the objective yarn having <=20mN/D breaking strength and <=15.0% elongation up to breakage of the fiber when a tensile breaking test of the fiber composing the multifilament yarn in an atmosphere of the normal state of 20+ or -2 deg.C and 65+ or -2%RH under conditions of 2cm sample length, 1mN/D initial tension (millinewton/denier) and 1cm/min tensile speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a multifilament yarn with excellent anti-pilling properties that is suitable for clothing fabrics, and a method for producing the same.

[Prior Art] Conventionally, in order to provide multifilament yarns constituting clothing fabrics with excellent pill resistance, the strength of fibers has been appropriately reduced.

(For example, p. 318 of "Textile Engineering (Vl) Manufacture and Performance of Final Products" edited by Textile Engineering Publication Committee of Japan Textile Machinery Society, published November 10, 1981) The methods that have been adopted to date are: A) While drawing the fibers at a low magnification, they are heat-set using a heating plate at a higher temperature than usual to impart weak points to the fibers.

B) Decrease the fineness of the single filaments of the fibers to moderately lower the strength of the entire fibers.

C) When manufacturing fibers by temporary twisting, the surface of the twisted body of the temporary twister is made to have a moderately rough surface to provide weak points on the surface of the fibers.

etc.

However, in method A), since the draw ratio is lower than that of normal drawing, the degree of elongation of the fiber after drawing and heat setting is higher than that of normal drawing. Due to the high elongation of the fibers, the energy required to break cannot be low enough. Therefore, pills that occur on clothing fabrics do not easily fall off from the fabrics. In addition, since the fibers are heat set at high temperatures, there are parts where the strength of the fibers is extremely low and parts where it is high, and the high parts lack anti-pilling properties and are therefore insufficient.

In method B), since the single filament fineness of the multifilament yarn is small, process passability is poor, and yarn breakage occurs during yarn processing and knitting and weaving processes, which is a drawback.

In method C), the surface of the twisted body of the temporary twister is roughened and the surface of the heated fibers is scraped off by friction, so the fibers after untwisting have extremely low strength in some parts and high strength in others. There is a high portion, and the high portion has no anti-pilling properties and is insufficient.

[Problems to be Solved by the Invention] In view of the above-mentioned points, the purpose of the present invention is to solve defects in fiber strength (fiber portions with extremely low strength) that occur in order to appropriately lower the strength of multifilament yarn. The purpose is to provide a multifilament yarn with excellent pill resistance by improving yarn breakage that occurs during yarn processing and subsequent knitting and weaving processes.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration.

(1) Tensile breakage test of multifilament yarn, which is a fiber constituting a chain yarn, was carried out in a standard atmosphere of 20±2° C. and 65±2% RH with a sample length of 2 cm.

Initial tension is 1mN/D (millinewton/denier),
An anti-pillar characterized in that the breaking strength of the fiber is 20 mN/D or less and the elongation until breaking is 15.0% or less when carried out at a tensile rate of 1 cm/min. multifilament yarn.

(2) When temporarily twisting a fiber bundle that has at least a portion of a multifilament yarn with a birefringence of 0.025 or more and 0.100 or less, heating a part of the temporary twisting area with high-temperature steam is recommended. The manufacturing method of the characteristic pill-resistant multifilament yarn.

The present invention will be further explained in detail below.

The property values of the anti-pilling multifilament yarn of the present invention are determined by the tensile breakage test of the fibers constituting the chain yarn under standard conditions (J
20±2℃, 65±2 as specified in IS Z 8703
%RH) under the following conditions.

That is, when carrying out a tensile rupture test on the fibers constituting the pill-resistant multifilament yarn, the initial tension was set to 1.
mN/D (millinewton/denier), sample length 2 c
m % Furthermore, conditions are used in which the tensile speed is limited to 1 cm/min.

The atmosphere in which the tensile rupture test is carried out may be a normal standard condition, and in the present invention, 20±2° C. and 65±2% RH, which are the standard conditions specified in JIS Z8703, were adopted.

In the tensile break test, the reason why the trial is carried out at an extremely short length of 2 cm is because the breaking strength of the fiber is originally determined at the weakest part of the fiber, so the test is long and the part with high breaking strength is compared. Even if it exists for a long time, this weak part is recorded as the breaking strength value. For this reason, if the value of the breaking strength is used as a standard, the generated pill will have a portion with high breaking strength, so it will be difficult to fall off and will progress to a pill. Therefore, the shorter the trial, the more highly the correlation between the breaking strength value and the pill can be understood. However, if the trial length is too short, the correlation with the length required for pilling and pill formation will decrease, so a trial length of 2 cm is suitable.

The reason why the initial tension is limited in the tensile rupture test is that if the multifilament yarn is a crimped fiber, the fiber will elongate due to the tension applied to the fiber. Therefore, the initial tension was set at 1 mN/D, which is sufficient to stretch and recover the crimp without being affected by this.

In addition, in the tensile rupture test, the reason why the tensile speed is limited is that the pilling that occurs in the clothing fabric falls off from the fabric.
Associated with extremely slow pulling speeds.

Therefore, in the present invention, the tensile speed was set to 1 cm/min, which is sufficient to express the shedding of the pill from the fabric.

The breaking strength and elongation, which are characteristic values of the present invention, are preferably calculated using the average values of at least 30 times under the above conditions in consideration of statistical reliability.

Next, characteristic values according to the present invention will be explained in detail.

First, the first feature of the present invention is that the breaking strength of the fiber is 20 mN/D or less when carried out under the above-mentioned tensile breaking test conditions.

Conventionally, in order to improve pill resistance, the above-mentioned A) and B)
In method C), the breaking strength of the obtained fiber is 20 m
It does not go below N/D.

That is, while stretching the fiber at a low magnification as in A),
In the case of a method that heat-sets the fibers at a higher temperature than usual using a heating plate, giving weak points to the fibers and reducing the strength of the fibers,
Variation occurs in the strength of the fibers, and pilling occurs due to relatively strong fiber portions. In this high-strength fiber portion, when a tensile break test is conducted under the above conditions, the break strength of the fiber does not fall below 20 mN/D.

Also, in the case of method B), in which the fineness of the single fibers is made thinner and the strength of the entire fiber is moderately lowered, the strength of the single fibers varies and it is not possible to uniformly suppress the strength of the fibers to a low level. , pilling occurs due to fibers that are relatively stronger than others.

In this high-strength fiber portion, when a tensile break test is conducted under the above conditions, the break strength of the fiber does not fall below 20 mN/D.

Furthermore, in the case of method C) in which the surface of the twisted body of the fibers is made into an appropriate roughness and weak points are added to the surface of the fibers, the surface of the heated fibers is scraped off.
After untwisting, the fibers have defects where the strength is extremely low in some parts, and the fiber strength varies. Due to variation,
Pilling is caused by fibers that are relatively stronger than others.

In this high-strength fiber portion, when a tensile break test is conducted under the above conditions, the break strength of the fiber does not fall below 20 mN/D.

In the present invention, in order to prevent pilling caused by variations in fiber strength, when a tensile breakage test is conducted on the fibers constituting the chain yarn in the multifilament yarn constituting the clothing fabric under the above conditions, The breaking strength of the fiber is 20 mN/D or less. Preferably 18 mN/D
or less, more preferably 15 mN/D or less.

Next, the second feature of the present invention is that when the multifilament yarn is subjected to a tensile break test on the fibers constituting the chain yarn under the above conditions, the fibers elongate from the initial tension to the maximum strength. degree is 15°0% or less.

In other words, in order to improve anti-pilling properties, conventionally, fibers are drawn at a low magnification and then heat-set using a heating plate at a higher temperature than usual, giving weak points to the fibers and reducing the strength of the fibers to an appropriate level. things are being done. In this case, since the fibers are drawn at a low magnification, the elongation of the fibers is 15.0% or more. Due to the high elongation of this fiber, the energy required to break the fiber is higher than that of the present invention. Clothing fabrics formed from these fibers are free from pill formation.
However, the disadvantage is that it does not fall off easily from the fabric. In other words, anti-pilling properties are not sufficiently improved.

In the present invention, in order to reduce the breaking energy of the fibers and suppress the occurrence of pilling, when a tensile breakage test is carried out on the fibers constituting the chain yarn in the multifilament yarn under the above conditions, the breaking strength is determined from the initial tension. The elongation of the fiber is 15.0% or less. Preferably 12
% or less, more preferably 8% or less.

As described above, by simultaneously satisfying the breaking strength and elongation when performing the tensile breaking test, it is possible to obtain a multifilament yarn with good pill resistance, which has not been possible in the past.

Such multifilament yarns with good anti-pilling properties include raw silk, twisted yarn, interlaced yarn, twisted yarn, fluffy yarn,
It can be preferably used in the form of a composite yarn.

In addition, multifilament yarns include raw silk, temporarily twisted yarn,
Any combination of interlaced yarns, twisted yarns, fluffy yarns, and composite yarns may be used in the form of intertwined, twisted, or fused fiber yarns. For example, combinations of raw silk and twisted yarn, raw silk and interlaced yarn, raw silk and fluffy yarn, raw silk and twisted yarn, raw silk and interlaced yarn, raw silk and twisted yarn, raw silk and fluffed yarn, etc. The threads are intertwined with each other.

Furthermore, it may be a yarn in which two or more of these forms are combined at the same time.

In particular, yarns that are twisted yarns that are interlaced yarns, yarns that are twisted yarns that are twisted yarns, yarns that are twisted yarns that are fluffy yarns, yarns that are twisted yarns that are twisted yarns, Interlaced yarns that are fluffy yarns, twisted yarns that are fluffy yarns, etc. are effective.

The present invention can be applied to clothing fabrics formed using raw silk, temporarily twisted yarn, interlaced yarn, twisted yarn, fluffy yarn, composite yarn, etc. made of multifilament yarn obtained by conventional processing methods. The desired anti-pill properties cannot be achieved.

Next, a method for manufacturing the pill-resistant multifilament yarn of the present invention will be described.

In the present invention, a multifilament yarn made of polyester fiber having a birefringence of 0.025 or more and 0.100 or less is used. For example, when temporarily twisting a multifilament yarn having chain yarns in at least a portion thereof, a part of the temporary twisting area is heated with a heating medium made of high-temperature steam.

In this case, even if a multifilament yarn made of polyester fibers such as POY is used, the breaking strength of the processed yarn obtained by the normal temporary twisting method is 20 mN.
/D or less and the elongation to break cannot satisfy the characteristic values of 15.0% or less, so there is no anti-pilling property. For this reason, clothing fabrics made from the processed yarn cannot be pill-free and have an excellent appearance.

In the present invention, 0.025 or more, such as POY, for example, 0.025 or more.
When pre-twisting polyester fibers with a birefringence of 100 or less, by directly heat-setting a part of the pre-twisting area with high-temperature steam, which has higher heating efficiency than a heating plate, it can be made with moderately low strength. Moreover, it can be made into uniform fibers. As a result, it is possible to provide a multifilament yarn with excellent pill resistance, which has characteristic values such that the fiber breaking strength is 20 mN/D or less and the elongation before breaking is 15.0% or less.

The multifilament yarn used in the present invention has a birefringence of 0.
025 or more and 0.100 or less, preferably 0.025 or more and oso or less, more preferably 0.025 or more and oso or less
．． 060 or less is effective.

Further, the high-temperature steam is preferably superheated steam with a pressure of 5 kgf/cm2G or higher, or saturated steam. More preferably, superheating at a pressure of 10 kgf/cm2G or more or saturated steam is effective.

In addition, if a multifilament yarn having at least a portion of the multifilament yarn made of the above-mentioned polyester fiber is heated in a part of the temporary twisting area and then directly cooled with water, the anti-pilling property will be better and more effective. be. The temperature of the water is 4
The temperature is preferably 0°C or lower.

More preferably, the temperature is 30°C or lower.

[Example] Example 1 Birefringence Δn=0.037, elongation 165%, round cross section 22
A polyester multifilament yarn of 5D (denier) and 48 filaments was subjected to temporary twisting using the drawing and temporary twisting apparatus shown in FIG. 1 under the following conditions to obtain a multifilament yarn.

In the stretching and temporary twisting apparatus shown in FIG. 1, a heating device 4 using high-temperature steam (saturated steam) was used as the heating fluid of the heating device, and water was used as the cooling fluid of the cooling device 5.

Conditions: Temperature in heating device = 213°C (Pressure of saturated steam = 20 kgf/cm2G) Temperature in cooling device = 28°C Comparative Example 1 Using the same polyester multifilament yarn as in Example 1, A tentative drawing was carried out under the same conditions as in Example 1, except that a heating plate was used in place of the heating device using saturated steam, and a cooling plate was used in place of the cooling device using water, using the stretching and temporary twisting device according to the prior art shown in FIG. A twisting process was performed to obtain a multifilament yarn.

Conditions: Temperature of heating plate = 2136C Temperature of cooling plate = 28℃ Comparative Example 2 Using the same polyester multifilament yarn as in Example 1, it was drawn in the usual manner using the drawing and twisting device shown in Fig. 2 in the same manner as in Comparative Example 1. A temporary twisting process was performed to obtain a multifilament yarn.

Note that the temporary twisting process was performed under the same conditions as in Comparative Example 1, except that the temperature of the heating plate in the above apparatus was 230°C.

As described above, the multifilament yarns obtained from Example 1 of the present invention, Comparative Example 1, and Comparative Example 2 were respectively supplied to a 24-gauge double-sided knitting machine in the same manner as usual to knit a punch liner.

Table 1 shows the physical properties of the multifilament yarns of Example 1 of the present invention, Comparative Examples 1 and 2, and the pilling test results of knitted yarns made from chain yarns.

In addition, among the physical properties in the table, the results of the pilling test are based on JIS
It was determined based on the test method of method A specified in L 1076.

Table 1 As is clear from Table 1, the multifilament yarn obtained from Comparative Example 1 has higher strength and elongation than the multifilament yarn of the present invention, and also in the pilling test results. It was inferior.

In addition, the multifilament yarn obtained from Comparative Example 2 was
Although the strength was the same as that of the multifilament yarn of the present invention, the elongation was higher and the pilling test results were also inferior.

Furthermore, the multifilament yarn of Comparative Example 2 has a lot of fuzz (
, and yarn breakage occurred frequently during operation, and yarn breakage and fuzz occurred during yarn processing and knitting processes.

[Effects of the Invention] The anti-pilling multifilament yarn of the present invention has superior pill resistance compared to conventional multifilament yarns. Therefore, the clothing fabric obtained from the multifilament yarn can be provided with an excellent appearance without pilling.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a drawing and twisting device for producing the pill-resistant multifilament yarn of the present invention, and FIG. This is a schematic diagram showing the drawing and twisting device.Package supply roller seal mechanism Heating device using high temperature steam: Heating plate Device using cooling water Cooling plate Twister Take-up roller Winding drive roller Highly oriented undrawn yarn Multifilament yarn

Claims (10)

[Claims] (1) Multifilament yarn, which is a multifilament yarn, was subjected to a tensile break test of the fibers constituting the yarn in a standard atmosphere of 20±2°C and 65±2% RH, with a sample length of 2cm and an initial tension of 1mN/
D (millinewton/denier), tensile speed 1cm/m
The breaking strength of the fiber was 20 m when carried out under conditions of
N/D or less and the elongation up to breakage is 15.
An anti-pilling multifilament yarn characterized by having an anti-pill content of 0% or less. (2) The anti-pilling multifilament yarn according to claim (1), wherein the multifilament yarn is a twisted yarn. (3) Claim in which the multifilament yarn is an interlaced yarn (
The pill-resistant multifilament yarn described in 1). (4) Claim (1) wherein the multifilament yarn is a twisted yarn.
) Anti-pilling multifilament yarn. (5) Claim in which the multifilament yarn is a fluffy yarn (
The pill-resistant multifilament yarn described in 1). (6) Claim in which the multifilament yarn is a composite yarn (
The pill-resistant multifilament yarn described in 1). (7) The pill-resistant multifilament yarn according to claim (1), wherein the multifilament yarn constitutes a fabric. (8) The pill-resistant multifilament yarn according to claim (1), wherein the multifilament yarn constitutes a fluffy fabric. (9) The pill-resistant multifilament yarn according to claim (1), wherein the multifilament yarn is a polyester fiber. (10) When temporarily twisting a multifilament yarn that has at least a portion of a multifilament yarn made of polyester fiber with a birefringence of 0.025 or more and 0.100 or less, a part of the temporary twisting area is A manufacturing method for pill-resistant multifilament yarn characterized by heating with high-temperature steam.