JPS6099027A - Polyester crimped fiber and its production - 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 (Industrial Application Field) The present invention relates to a polyester crimped fiber having good thermal stability, high strength and high modulus, and a seven-glue method.

(Conventional technology) Polyester fiber alone or cotton.

It is widely used as yarn by blending it with hemp, rayon, etc.

In order to improve the spinnability of polyester fibers, it is common to increase the strength, lower the elongation, and increase the modulus. is achieved.

However, when trying to achieve high strength, low elongation, and high modulus in the production process of core fibers, the crimp performance of the fibers inevitably deteriorates, resulting in a significant decrease in spinnability in the pre-spinning process. It's getting worse. In addition, the heat shrinkage rate of the TP fibers becomes large, and the heat shrinkage of the fabric becomes large, causing a problem in that the inside of the fabric becomes insufficient.

In order to solve this problem, Japanese Patent Publication No. 52-6368 describes the manufacturing capacity of polyester crimped fibers that have high elasticity and high modulus, excellent crimp performance, and low heat shrinkage. , has been proposed.

However, due to the above-mentioned manufacturing ability, it is 1! (If a fabric using a polyester crimped fiber that leaks is subjected to heat treatment using a tenter in order to fix its dimensions, the fabric structure will be deformed, and the 11RI+ of the C fabric will have the disadvantage of becoming wrinkled.

(Objective of the Invention) The object of the present invention is to eliminate the disadvantages mentioned in 011 by 1. Tete Kara high modulus n? M
H. When the filter cloth is hung on a tenter, the concretion tissue remains even when fixed, the shape is small, and the ears σ) do not wrinkle when hung. There is K.

(Structure of the Invention) The inventor of the present invention has achieved the above-mentioned object → thinned the fabric (after conducting a study, it was found that 111 parts of the fabric were drawn and separated when the fabric was heat-treated with a hooder, 2 of the fibers
Know that it is related to heat shrinkage stress at 00℃
.

As a result of further study based on this knowledge, the present inventor found that
Next, the pressure between the two brothers was reached.

That is, according to the invention of Introduction 1 of the present invention, the breaking strength is 7, f/d
The above is a high modulus polyester crimped material with a stress of s, sg/dV when stretched to 10 cm and a crimp ratio of 10 or more, and a heat shrinkage ratio of 5% under dry heat at 180°C.
and the initial tension is o, o s 1//d
The heat shrinkage stress at 200℃ when setting K is o, o
The second aspect of the present invention is a polyester crimped fiber characterized by having a polyester fiber with a polyester fiber having a natural stretching ratio of 1.s#, /av or less. After stretching 4 to 1.5 times, 1 #/d or more 311
After heat treatment at a temperature of 11°C under a tension of less than /d, 12
℃ temperature (to give a crimp degree of 10 degrees or more), and then crimped at 400 k in a filling chute.
The tow packed to a packing density of g/m' or more is placed in a stand on a comparer connected to a heat treatment machine, and subjected to free shrink heat treatment with hot melon at 11°C.
, Ts satisfy the following equations [1) to [V] at the same time. This is a method for producing crimped polyester fibers with f and j characteristics.

TI≦240 ・・・・・・・・・・・・・・・・ [1
]1', ≦0.1'l', +110 ・・・・・・River/Mountain... ]] Summer J] 1-≧-1.51. +415
・・・・Old・Yamakawa・ [River] 1゛3≧−0,4T,+
195 River/Old/Mountain... [1ν] 3.75X1
0 xT, xl"s5q', <1), -=-EV) The present invention mainly targets polyester and 21-lyethylene terephthalate, but within a range where its properties are not essentially changed. The polyester may be a polyester copolymerized with a third component (for example, 107 Ru or less).The polyester may contain additives such as a matting agent (1), a coloring agent, a coating agent, an anti-turquoise agent, and (6) a flame retardant. May be contained.

The first z·d-res full condensed fiber of Kinen ψ1 has high strength, high modulus, t·, low heat shrinkage rate, and small heat shrinkage stress.

That is, the crimp of the present invention has a breaking strength of 79/d or more, a stress at 10% elongation of s, sy/d or more, and a crimp rate of 10 or more. It is necessary.

If the breaking strength or the stress at 10% elongation is out of the above range, it will not be able to withstand the recent high-speed rotation in the spinning process, and yarn breakage will occur, making it difficult to stably produce high-quality spun yarn. I can't.

Also, if the crimp H is less than lO-, such crimp #!
L-fibers tend to wrap around carded silicone, etc., resulting in large variations in the thickness of the resulting spun yarn.

Next, the polyester crimped axial fiber of the present invention satisfies all of the above-mentioned breaking strength, stress when stretched to 10 inches, and crimp rate, and has a heat shrinkage rate of 5% or less under dry heat at 180°C. Further, it is necessary that the heat shrinkage stress at 200° C. when the initial tension is set to o, o s l/d is 0.051//d or less.

Here, dry heat shrinkage rate at 180℃ and initial tension 0.0
If the heat shrinkage stress at 200℃ when set to 511/d is out of the above range, and heat treatment is performed with a sinter, the fabric structure will become dark, the edges of the fabric will hang, and wrinkles will occur. .

Moreover, it is possible to dye a spun yarn made of such polyester crimped ff#(t) with a hakama-rutsu f(shape stretch) (cheese dyeing).
When the drying shrinkage rate is 5 cm, if the resulting spun yarn is subjected to cheese dyeing, the spun yarn will shrink during dyeing. Ii, the resistance of the Sengopa 1 of the L staining solution increases, and the discoloration of the inner and outer layers 1 of the cheese becomes more likely to occur.

As described above, the method for manufacturing the 5i ゛su・6tsuno 1 (1-1-fangled twill fiber) of the present invention is as follows:
The undrawn yarn was stretched at a high magnification and then subjected to tension heat treatment for 4 sL (-
After that, the crimp is applied to 0 force, and (after that, free shrinkage heat treatment is applied. This is followed by stretching of this storage, tension heat treatment, WA shrinkage, and free shrinkage heat treatment.) It is.

First, the stretching conditions are set as f! J l”l i+,,
The natural stretching ratio of f2 unt/I medium yarn is 1.4 to 1.
It is important to stretch at 5 times.

Such high-strength stretching is preferably carried out by liquid bath stretching in a hot water bath containing, for example, 0.5 to 1.0 weight % of higher fatty acid phosphate. According to such a stretching method, a tow of several hundred thousand to several million tensio 1 can be stretched at 1.4 to 1.5 times the natural stretching ratio to 10011I/1 without causing any wrap on the 1-line. Stretching can be performed at speeds of minutes or more.

If the stretching ratio is less than the natural stretching ratio of 1.4, the breaking strength of the crimped W fibers to be saved is less than 7 g/d, and the IO% elongation stress is less than 5 p/d. Yarn breakage occurs frequently during the spinning process.

In addition, if the stretching ratio exceeds 1.5 times the natural stretching ratio,
Yarn breakage occurs frequently during the stretching process.

Next, the highly oriented drawn yarn obtained by the above-mentioned drawing operation has a high thermal shrinkage rate and high thermal stress, and needs to be heat-treated to improve thermal stability.

As means for such heat treatment, tension heat treatment is carried out immediately after stretching, and free shrink heat treatment is carried out after crimping with a crimp degree of lO- or more is carried out.The conditions and combinations thereof are important.

First, it is necessary to set the tension in the tension heat treatment to 1 to 3 p/d, preferably 1.5 to 2.5 y/d.

If the tension is less than 119/d, the modulus will be low due to relaxation of the amorphous portion of the fiber, while if the tension exceeds 31/d, the fibers will become rigid and sufficient crimp will not be obtained.・.

Here, tension heat treatment TMT, ℃ and free shrink heat treatment J'l+
The relationship with the temperature T5°C is shown in the Bi diagram.1゜Figure 1 shows that polyester drawn yarn drawn at 1.4 times the natural draw ratio was subjected to tension heat treatment under a tension of 1.5 #/d, and then 13 pieces were drawn. / After applying Ingu's crimps, the tow packing density is 400 kg/(y4) to give a free heat treatment and make the crimped cord 4!+ 2- At the time, tension heat treatment temperature T and free heat treatment temperature a This figure shows the results obtained by measuring the physical properties of crimped p-fibers obtained by changing various methods.

Such physical properties include breaking strength (St), 1.

Stress during elongation (M+o) + ls o℃ heat shrinkage rate (S
r+go) I and initial tension as o, o s IId K
Heat shrinkage stress at 200℃ when set (SrM)
In the figure, ○ mark indicates Si20 y/d + Mho≧
5.5 #/d + Sr+go≦5%+ SrM≦0
．． A crimped fiber that satisfies all o s g/d is indicated, and an x mark indicates a crimped fiber that has any one of these physical properties outside the above range.

From Figure 1, the crimped fibers marked with ("), that is, the crimped fibers with high modulus, low heat shrinkage rate, and low heat shrinkage stress, which are the objects of the present invention, are surrounded by straight lines ←) and ~) in the figure. The straight lines from 0) to 2) can be expressed by the following equations.

T,=240 ・・・・・・・・・・・・P)1
's = 0, 1 'l'+ + 110...
・・・・・・・・・(b)T, =-1,5T,+41
5 ・・・・・・・・・・・・・・・(c) T, = −
0,4T, +195 ・・・・・・・・・・・・・・・
The relationship between T1 and 'r, which provides a crimped fiber with high modulus, low heat shrinkage rate, and low heat shrinkage stress, which is the object of the present invention, is shown using the following formula: CI below)
It can be represented by the formula (IV).

T, ≦240 ・・・・・・・・・・・・・・・ [1
]T, ≦0.1T, '+11 o ・・・・・・・・・
...... Elf)T, ≧-1.5'l', +41
5 ・・・・・・・・・・・・・・・ [River] T, ≧-0
, 4T, + 195 ・・・・・・・・・・・・・・・
・ [1v] Here, if T, > o, +T, +11o, NL6 cannot be greater than s, sg/d, and T, (-1,5T, + 415) is S rU
It is not possible to set fi to 5 or more -F. And'l
”, < −11, 4T.

For +195, Sru is 0.0 s y/c+
v) It cannot be I.

First, the temperature T at the time of crimp (=j) with a crimp degree of l〇- or higher is also important.

The tR2 diagram shows the relationship with the above-mentioned T, , 1-, 'l-. Figure 2 shows crimps with a crimp degree of 10% or more.
Then, a free shrinkage heat treatment is applied to K, 1'.

The degree of crimp of the crimped fiber obtained by changing -9T is measured.

In the figure, O9Δ marks are T1=190'C, 22
It is set at 0°C and - and T are changed,
The white ones have a crimp degree of 10% or more, and the black ones have a crimp degree of less than 10%.

In Figure 2, the T has a crimp degree of 10 or more.

The relationship between and T3 can be expressed by the following equation.

T, = 190℃ 1-'≧0.713XT,...
・(1) 'l', = 220℃ TI≧0.825X
'l',...(11) Here, (+) (II
) expressions are respectively expressed as Tt'/190 + T@/220, and the slopes of 1 and (+) (il) are both 3.75XIO
-3, so the relationship between Tt, Tt, and Ts is T, ≧
3.75X10 XT, XT.

It can be expressed as

Temperature 1) at the time of crimping is free shrinkage heat treatment temperature T
If the value exceeds , the modulus of the obtained crimped #fiber decreases, so the relationship between K T, , T, and - needs to be within the range expressed by the following equation.

3.75 X 1O-3X T, X T, ≦T, <
1', ... [v] Furthermore, the tow packing density on the conveyor during free shrinkage processing is also important, and such packing ff
l+■4oak1//rr? It is necessary to do more than that. This packing density is 41111 kq/y
(11) The crimp degree of the potted fibers obtained is less than 10%.

(Function) Generally, a fabric made from spun yarn is hung on a tenter to fix its dimensions, but the heat treatment temperature is 180°C.
1, which is ~200°C, is the heat shrinkage characteristic of the fibers that make up the spun yarn at 180~200°C.

In this regard, in the present invention, the dry heat shrinkage rate and initial tension of 1so'T'1tC1, 200 when the initial tension is set to 0.059/dK of high strength, high strength, and high strength polyester crimped fibers.
By specifying the heat shrinkage stress at °C,
After fixing the dimensions, it is possible to prevent the ears of the S hanging from being pulled or wrinkled.

(Effects of the Invention) According to the present invention, it is possible to speed up the spinning process, and it also eliminates the problem that occurs when a conventional fabric made of high strength and high modulus crimped fibers is fixed in size by hanging it on a tenter. It was possible to provide a crimped fiber that can prevent the selvage of the fabric from being pulled up or wrinkled.

(Example) Example! Polyethylene terephthalate having a limiting viscosity of 0.620 measured in an oron chlorophenol solution at 25° C. was melt-spun and wound for 1000 m in 7 minutes. Insert this undrawn yarn into a universal tensile tester and test sample length = 20011 +
It was stretched at a stretching speed of 1-100 cm/min, and the natural stretching ratio was measured to be 3.0.

This undrawn yarn was subjected to drawing, stretching heat treatment, indentation crimping, and free heat treatment under various conditions shown in Table 1, and the performance of the resulting polyester crimped fibers is also shown in Table IK. Here, the tension during tension heat treatment is 1.5 p/d, and the tow packing density during free heat treatment is 4ookst/m or the number of crimps is 13/d.
(Note 1) Thermal shrinkage stress is the tow l0 after free heat treatment F+1 (
) The denier is KE-21 manufactured by Kanebo Engineering Co., Ltd.
! a%K" (initial tension 0.05 Ji'/d + Jl Temperature rate 3, σTl+ constant at 0℃/2 minutes fc 0 (Note 2) Breaking strength, stress at 10% elongation, Toyo Paul F
Wynn ffLli'111-II type tensile tester sample length 21111. It was stretched at a tensile rate of 100 inches/min, and its back stretch curve was determined.

Furthermore, these test items were made of polynisdel/cotton = 6573
The yarn was spun at a ratio of 045 to 045. The twist coefficient at this time was 3.0.

Some of these are cheese-dyed Pusto K (Il, L), and some are subjected to the usual bleaching process after weaving, and the fabric dimensions are heat-set using a tenter.

The results are shown in Table-2.

Table-2 Polyester crimped #p fiber of the present invention (test Nα1-2,
5, 8110) (t5) The workability of the spinning and V-weaving process is very good.

In contrast, when polyester with high thermal stress (City 3) is used, even when blended with cotton, the thermal stress of the raw polyester is directly reflected in the properties of the spun yarn, and because of this, the fabric dimensions are not fixed by heat. Time Cloth Month i1 (is pulled down.

If a material with poor crimp performance (rζo, 4) is used, it will worsen the quality of the spinning process and have a large impact on the subsequent process.

Sa1. IK, Moji: L 5 Snow low mo') (N11
L+; .

7.11) is a relatively U゛ twist condition (with twist coefficient = 3.0).
If the spinning process is too busy, the spinning productivity will improve), the strength of the spun yarn will decrease, and the strength fluctuation rate will also increase, making it easy for the yarn to break during warping.

The one with a high heat shrinkage rate at the very edge (NIIL9) is not preferred for practical use because it makes the difference in dyeing between the inner and outer layers more noticeable during cheese dyeing.

Example 2 An undrawn yarn with a spinning speed of 1000 m/min and a natural draw ratio of 3.0 was subjected to tension heat treatment at a temperature of 215'C, a push crimping temperature of 100C, and a free heat treatment temperature of 110C to determine the draw ratio and tension during the tension heat treatment. .

Table 3 shows the physical properties of the product when the tow packing density on the pulley is changed. There are large fluctuations in quality.

(*2) Stretching is not possible due to thread breakage.

[Brief explanation of drawings]

Figure 1 shows the relationship between the tension heat treatment temperature T1 and the degree of free shrink heat treatment T, and Figure 2 shows the relationship between the free shrink heat treatment humidity T5, the temperature T at the time of applying contraction, and the tension heat treatment temperature ゛■゛. This is a graph showing. Applicant Teijin Ltd. Representative 1) Pure fv/・:”(Figure 1 20,000, -120 Ioo 110 1 rib +347

Claims (1)

[Scope of Claims] ill A high modulus polyester crimped fiber having a breaking strength of 79/d or more, a stress at 10% elongation of s, s9/d or more, and a crimp ratio of 10% or more. , the crimp #
The heat shrinkage rate of navy blue under dry heat at tSO℃ is 5% or less, and the heat shrinkage stress at 200℃ when the initial tension is set to o, o s I/d is 0.051/d or less. Polyester crimped fiber for heavy machinery. 121. The polyester crimped fiber according to claim (1), wherein the main repeating unit of the polyester is ethylene terephthalate. (The undrawn yarn obtained by melt spinning polyester No. 31 is stretched 1.4 to 1.5 times its natural draw ratio at 1c, and then 1°C under a tension of 19/d or more and 3tt/d or less. After heat treatment at a temperature of '1', 'c', indentation crimping is performed to give a crimp degree of 10% or more, followed by busy filling in a filling chute with a packing density of 400 kg/i or more. The resulting tow is placed in a forest on a spool connected to a heat treatment machine and subjected to free shrinkage heat treatment at a temperature of Ts'c, and at that time, each of the above-mentioned temperatures T+, Tt, and Ts is set to (I) to EV) as shown below. A method for producing a polyester crimped fiber, characterized by adding VCP to Ps1 in the formula. T,≦240 ・・・・・・・・・・・・[1]1−≦
0.1T, +110・・・・・・・・・・・・[11]
T, ≧-1.5T, +415...Mountain...
till) T, ≧-0,4T, +195...Mountain-...=
=(lV)3.75X10 X'l', X'l', 5'
1%≦1'3-(V) (4) The main repeating unit of the polyester is ethylene terephthalate [The method for producing a polyester crimped fiber according to claim 31.