JPS60162820A - Production of polyester profile processed yarn - 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 has a thick and narrow bed in the longitudinal direction of the yarn, and there are many residual twists of S and Z alternating at short pitches, and the entire side surface of the yarn is This invention relates to a method for producing a novel thick processed polyester yarn that has minute loops and is rich in bulk.

<Prior art and its problems> Conventionally, methods for manufacturing polyester processed yarn having a thick and narrow bed in the longitudinal direction of the yarn are disclosed in, for example, Japanese Patent Publication No. 4B-19627, Japanese Patent Publication No. 58-55251, and Japanese Patent Publication No. 58-58. 40
It is disclosed in Japanese Patent Publication No. 92, Japanese Patent Publication No. 58-87417, etc. However, the method described in Japanese Patent Publication No. 4B-19627 uses an undrawn polyester yarn with a birefringence index of 80.5 to io x to as a supply system, so the supply system changes over time, and the quality cannot be maintained at a constant quality. There is a problem in that it is extremely difficult to stably produce thick and thin threads.

Also, Special Publication No. 58-55251, Special Publication No. 58-4
The methods described in Japanese Patent Publication No. 092, Japanese Patent Publication No. 58-87417, etc. are those in which undrawn polyester yarn is incompletely stretched to form a yarn having a thick and thin bed in the longitudinal direction of the yarn, and then subjected to false twisting. In this case as well, if the birefringence of the supply system is too low, not only will its change over time become a problem, but also when the thick and thin yarn is twisted while being heated during false twisting, the In many cases, the yarn filaments cannot move relatively freely within the cross-section or in the longitudinal direction of the yarn, and for this reason, false twisting is performed at a processing temperature such that the single filaments of the yarn form a melt layer. , so-called fusion in which the bundled part due to residual twist and the crimped bulky part remain alternately in the longitudinal direction of the yarn, or the S and Z alternate twists remain without a substantial crimped part as a boundary. When manufacturing textured yarn, many S and Z residual twists do not occur in the longitudinal direction of the textured yarn at short pitches, so the appearance of the fabric due to the residual twists does not have a so-called mature appearance, and large axis twists are prevented. There are disadvantages in that the dyeing shading effect and spun-like texture effect on the fabric surface are insufficient, the bulkiness of the fabric is insufficient, and the texture becomes rough and hard.

In particular, the frequency of the actual twist portion remaining in the longitudinal direction of the processed yarn is 10
If the number is less than 1,500 pieces per 07i'J and the length of the part is long, there is a disadvantage that appearance irregularities due to twisting become noticeable on the surface of the fabric and the quality deteriorates.

<Purpose of the Invention> The present inventors have improved the lack of the above-mentioned conventional method, and have created a yarn that is not affected by changes over time in the supply system and has sufficient thick spots. There are many residual twists alternating between S and Z in the direction, and there are small loops on the entire side of the yarn, and even the yarn is bundled by adhesion between single filaments and residual twist, and has a high bulkiness. As a result of intensive study on the manufacturing method of polyester thick textured yarn, we found that (a
) The elongation and hot water shrinkage rate of the supply system are related to changes over time in the supply system; (b) The elongation and hot water shrinkage rate of the yarn to be subjected to false twisting are related to the single yarn during false twisting. Based on this knowledge, we focused on the product of yarn elongation and hot water shrinkage rate as a factor in the production of thick textured polyester yarn through false twisting, and developed the present invention. reached this point.

<Structure of the Invention> In other words, the present invention is characterized in that the polyvarnish ↓ chill multifilament yarn with a product (X) of breaking elongation and hot water shrinkage of 10,000 or less is used as a supply system, and the supply is carried out in a non-contact manner. After subjecting the yarn to a relaxation heat treatment of 80% or more with fluorine to reduce the birefringence index to lower than that of the supply system without significantly increasing the degree of crystallinity, the yarn is stretched to achieve the above-mentioned breaking elongation. The product of 3000 or more and the hot water shrinkage ratio is 3,000 or more, and the yarn has thick axial turns in the longitudinal direction, and is then false-twisted at a temperature where the yarn forms a melt layer without elongating to a large extent. It's about processing.

The method of the present invention will be explained in more detail below.

First, the first configuration of the present invention is in the supply system, where the product (X) of the elongation at break and the shrinkage rate of hot water (hereinafter referred to as the (X) value) is 100.
It is necessary that the yarn be a Borienether multifilament yarn of 00 or less. In other words, undrawn yarn whose (X) value in the supply system exceeds toooo, for example, undrawn yarn spun at a relatively low spinning speed of about 1800 m/mix or less, has high elongation at break and high hot water shrinkage. When an undrawn yarn like this is drawn to make a thick and thin yarn, it can be made into a yarn with a relatively large thick-to-thin ratio due to its high breaking elongation, but on the other hand, it is unstable against external forces and thermal energy from the surroundings. Both elongation at break and hot water shrinkage tend to decrease over time, and differences in appearance and dyeing density of the major gyrus become significant even with a small amount of time; for example, in yarns with an (X) value exceeding 20,000, the number This is not preferable because it causes problems in practical use over the course of several days.

However, in the present invention, since the supply system is an undrawn yarn spun at a relatively high spinning speed of (X) value of 10,000 or less, for example, a spinning speed of 8,000 m/mis or more,
Both the elongation at break and the shrinkage rate in hot water are low, so that they do not pose any practical problems even after a period of time has elapsed, and there is no problem with changes over time. It should be noted that the invention feeding system has a lower elongation at break than the undrawn yarn spun at the low spinning speed, so it is relatively difficult to make the yarn thicker and thinner. Since the filament is first subjected to relaxation heat treatment as described below without making it into a fine filament, and then stretched to make it thick and thin, it is possible to sufficiently increase the thick-to-thin ratio even if the (X) value is 10,000 or less.

The second aspect of the present invention is a relaxation heat treatment, in which the supply system is subjected to relaxation heat treatment of 30% or more in a non-contact state to increase the birefringence of the supply system without significantly increasing the degree of crystallinity. The birefringence of .

In this case, when the yarn comes into contact with the heating device, sufficient contraction cannot occur due to the contact resistance of the yarn. It is also undesirable because it causes uneven changes in crystallinity and birefringence.

If the relaxation rate is less than 30%, the contraction is insufficient and the birefringence decreases little, and even if the yarn is stretched, there will be little difference in dyeing between the thick parts, so it is not suitable. As mentioned above, it is desirable to set it to 80% or more, preferably 40% or more. Note that the relaxation rate here refers to the ratio of the difference between the supply speed and the withdrawal speed to the withdrawal speed, expressed as a percentage.

If the crystallinity is increased in this relaxation heat treatment, the (X) value after stretching, which will be described later, will decrease, and during the subsequent false twisting process, the single filaments that make up the yarn will move freely in the cross-sectional and longitudinal directions. However, the thick and thin threads that are the object of the present invention are
This is not desirable because it cannot be obtained.

Furthermore, when the supply system is directly drawn to form a thick and thin yarn as in the conventional method, the birefringence of the thick part of the yarn will not be lower than the birefringence of the supply system. The birefringence of the yarn is lowered by heat treatment than the birefringence of the supply system, so if this yarn is drawn to make a thick axial yarn, the birefringence of the thick part will be lower than the birefringence of the supply system. It can be lower than the refractive index. The birefringence of the fineness portion of the large and fine yarns is at almost the same level regardless of the difference in the birefringence of the supply system. Since the birefringence of the thicker part is lower than that of yarn, spun-like effects such as shading effects can be exhibited more effectively.

In addition, in order to reduce the birefringence without significantly increasing the crystallinity by applying the relaxation heat treatment to the above-mentioned supply system, the combination of yarn speed and temperature during the relaxation heat treatment is important; if the treatment temperature is too high, If the birefringence decreases too little or if the temperature rises, it will increase. On the other hand, if the birefringence is too low, it will be difficult to shrink the yarn sufficiently, for example, if the feeding speed is reduced to 100 m/zi
In the case of R, the treatment temperature is 180°C or less, and the birefringence after relaxation heat treatment is less than that of the supply system and 15
It is preferable to set it to X10-8 or less.

Historically, the third feature of the present invention is drawing, in which the finely textured yarn is drawn after the relaxation heat treatment to produce a yarn with an (X) value of 3000 or more and a thick axial turn in the longitudinal direction of the yarn. . in this case,
The stretching is preferably carried out at a temperature at which crystallization does not substantially occur so that a sufficient thick-to-thickness ratio can be obtained.

The drawing ratio is 0 when the natural drawing ratio of the yarn is Dn.
．． It is preferable to set the stretching ratio to 75Dn+0.17 or more. Here, the natural stretching ratio refers to the maximum stretching ratio in the constant stress stretching region (flow region) calculated from the load-stretching curve measured at a sample length of 50 crn and a tensile speed of 50 a/in.

Thus, the thick-to-fine ratio of the single filaments constituting the yarn is I
It is desirable that the yarn is thick and thin, with a percentage of 0% showing uneven fineness of the yarn being 5% or more, and a birefringence index of the thick portion being lower than that of the supply system.

In addition, if the (X) value of the yarn after drawing is less than 3000, it will not be possible to obtain a profit because many residual twists of 8. This is not preferable because the fabric does not have a sophisticated appearance.

In addition, even if the (X) value of the drawn yarn is 5ooo or more and the yarn has large pongee spots in the longitudinal direction, if the elongation is small, it is necessary to increase the hot water shrinkage rate. However, if the hot water shrinkage rate is too high, the thermally unstable parts are likely to be heat-set during false twisting due to the high hot water shrinkage rate, and the thick/thin effect of the yarn will cause the yarn to deteriorate after false twisting. Since the twists that occur in the longitudinal direction of the yarn are more firmly fixed, the twists tend to remain even if a considerable amount of external force is applied when forming the yarn into a fabric, causing the twists to be noticeable on the fabric surface and increase the bulk of the fabric. It is not preferable because it lacks elasticity and has a rough and hard texture. On the other hand, if the hot water shrinkage rate is low, it is necessary to increase the elongation, but if the elongation is too large, the processing tension during false twisting will be extremely low, and stretching will be necessary to maintain an appropriate processing tension. However, it is necessary to false-twist the yarn, and as a result, the thick part is drawn and the thick/thin effect is reduced. Since the fibers are forcibly stretched without being able to move, fuzz is generated due to breakage of the single fibers, which is undesirable. Therefore, it is preferable that the (X) value of the yarn after stretching is such that the elongation at break is 200% or less and the hot water shrinkage rate is 100% or less, and it is desirable to select the relaxation heat treatment conditions and stretching conditions in this way.

Even if this (X) value is 3000 or more and exceeds 1ooooot-, there is no problem with aging because the false twisting process is immediately performed.

Furthermore, the fourth structure of the present invention is suitable for false twisting, and the yarn having a CK) value of 3000 or more and having thick axis turns in the longitudinal direction is then subjected to a melt twisting process. False-twisting is performed at high temperature without stretching to a large extent.

That is, in the present invention, since the large fine yarn with an (X) value of 3000 or more is false-twisted at a temperature that forms a melt layer, many residual twists of S and Z alternate in the longitudinal direction of the yarn are generated at short pitches. death,
Despite having alternating twists, it exhibits a so-called mature appearance with no noticeable change in appearance due to twisting.

In addition, in this case, the processing tension fluctuates because the yarn having thick axis turns in the longitudinal direction of the yarn is supplied to the false twisting heating side where heating and twisting strain act synergistically. The yarn supplied to the heating side must have an internal value of 8000 or more,
Since this is false-twisted without being stretched to a large degree, the single filaments that make up the yarn can move relatively freely in the cross-sectional and longitudinal directions of the yarn even under the above-mentioned fluctuations in processing tension. Therefore, many minute loops are generated on the side of the processed yarn due to the thick axis of each single filament, and even though the entire yarn is bundled by the adhesion between the single filaments and the alternating S and Z twists. However, a processed yarn with bulkiness can be obtained, and the thick part of the single filament may be stretched due to excessive twisting strain during false twisting, resulting in a decrease in the thick/thin effect or a-thin effect, or a foreign yarn. It never happens. Here, "without stretching to a large width" refers to stretching without substantially changing the fineness of the majority of the material before and after false twisting, specifically, stretching at a stretching ratio not exceeding 1.1 times. .

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention.
The yarn (F) drawn out is sent to the feed roller (3) through the yarn feeding guide (2), and then the feed roller (
A non-contact type heater (
4) is heat-treated in a relaxed state to sufficiently shrink the yarn and at the same time reduce the birefringence without significantly increasing the degree of crystallinity, followed by passing through the 10th layer (5). The yarn is hot-stretched between the 10th layer and the 20th layer (7) by a heater (6) and has an (X) value of 3000 or more and a thick axis in the longitudinal direction of the yarn. 20-
The yarn passes through the roller (7), is heated by the false twisting spindle (9), and is heat-set by the heater (8) at a temperature where the yarn becomes a melt layer, and is false-twisted without being stretched to a large width. The package is then rolled up by a winding roller 0]) on day 0.

The polyester in the present invention is a polymer having an ester bond in its molecular chain, and includes homopolymers typified by polyethylene terephthalate, copolymers or blend polymers thereof, and the like.

Further, the birefringence (Δn) is a value measured by the e-fringe measurement method using a polarizing microscope compensator, and the crystallinity is measured by the density method and calculated from the following equation.

However, XC is the degree of crystallinity, d is the density of the sample, and dc is the crystal m
(D density, da is the density of the amorphous part. In the case of polyethylene terephthalate, dQ "" 1.455, da =
It is 1.885.

In addition, the elongation at break and the hot water shrinkage rate are J-cho S L1090 (
This is a value measured according to the elongation rate and hot water shrinkage rate.

<Effect of the invention> As mentioned above, in the method of the present invention, the (X) value is too.

A polyester multifilament yarn specified as below was used as a supply system, subjected to relaxation heat treatment under specific conditions, and then stretched (
X) The yarn has a specified thick axis turn with a value of aooo or more, and this yarn is false twisted under specific conditions, so the 8 twists of S and Z alternating in the longitudinal direction of the yarn have a short pitch. Despite having alternating twists, it has a so-called mature appearance with no noticeable change in appearance due to twisting.

In addition, in the method of the present invention, the yarn to be subjected to false twisting has an (X) value of 3000 or more, and is false twisted without being stretched to a large width. Since the yarn filaments can move relatively freely in the cross-sectional and longitudinal directions of the yarn, many micro loops are generated on the sides of the processed yarn due to the thick axes of each single filament, resulting in adhesion between the single filaments and S Although the entire yarn is bundled by the , z alternating twists, a textured yarn with bulkiness is obtained, and unlike the conventional method, the large fineness portion of the single filament does not suffer from excessive twist distortion during false twisting. It will not become foreign due to the reduction of thickening and thinning effects or shading effects due to elongation.

<Explanation of Examples> The polyethylene terephthalate of the example was spun at high speed and had a birefringence of 56×10, a crystallinity of 9.8%, and a product (X) of elongation at break and shrinkage in hot water of 7820 ( A polyester multifilament yarn 110d/86f with a breaking elongation of 115% and a hot water yield rate of 68% was subjected to relaxation heat treatment → stretching → under the conditions shown in Table 1 according to the manufacturing process shown in FIG.
False twisting was carried out to produce polyester thick textured yarn (A) according to the method of the present invention. In this case, the birefringence index of the yarn after relaxation heat treatment is 9.5X10, the crystallinity is 98%, and the (X) value after stretching is 5200 (breaking elongation 105.0
%, hot water shrinkage rate 49.5%).

(Left below) Table 1 On the other hand, for comparison, polyethylene terephthalate was spun using a conventional method, with a birefringence of 39.5XIO and an (X) value of 17,500, and an elongation at break of 35
〇- Applying width counter-twisting process L7 to false-twist processed yarns (B) and (C), and using the same supply system as the method of the present invention, draw → false-twist process under the conditions shown in Table 2, False-twisted yarn) was produced.

Table 2 Thick processed yarn (A) obtained by the method of the present invention has a thickness determined by measuring the cross-sectional area of each single filament using an Amsler area meter in a cross-sectional photograph of the yarn, and by the ratio of the maximum value to the minimum value. The fineness ratio is 45, and C shows uneven thickness in the longitudinal direction of the twisted yarn.
The percentage value was 7.5% when measured using a Wouter (manufactured by Zellweger) under the conditions shown in Table 3. And the length of the remaining part of 8 twists and the remaining part of 2 twists is 5 to 40
The total number of yarns in nm+ was 2,000 per 100 m, and the processed yarn had minute loops on the sides of the yarn and had almost uniform bulkiness.

Table 3 When this thick textured yarn (A) was used for the warp and weft yarns, it was woven into a plain woven fabric under normal weaving conditions and dyed. It was a novel fabric that had a heathered feel, linen-like texture, and excellent bulkiness.

On the other hand, the comparative false-twisted yarn (b) had an internal value of 17,500 in the supply system, which exceeded 10,000, so the dyeability gradually changed in the longitudinal direction of the yarn. A fabric woven from this processed yarn (b) in the same manner as described above had extremely noticeable linear and warp-like defects and was of extremely poor quality.

In addition, the comparative false-twisted yarn (C) has an (X) value of 1645 (breaking elongation 1 (15%, hot water shrinkage rate 17.5%)), which is less than 3000. The convergence part was conspicuous in the longitudinal direction of the yarn, and the remaining real twist was conspicuous.The fabric woven from this processed yarn (c) in the same manner as above had subtle grains on its surface. This was different from the quality aimed at by the present invention.

In addition, the (X) value of the yarn subjected to the false twisting process is 2800 (elongation at break 40%, hot water shrinkage rate 70%).
%) and the refractive index of the large fineness part of the yarn that is lower than 3000 and subjected to the false twisting process. It is a processed yarn that lacks the thick and thin effect in appearance, and the length of the actual twisted portion remaining in the longitudinal direction of the yarn is 5 to 40 mm, and the total length of the twisted portion is 100 mm per 100 m.
There were 0 pieces. In addition, the fabric woven from this false-twisted yarn) in the same manner as above has a strong residual twist in the longitudinal direction of the yarn, clear twists are observed on the surface of the fabric, and is coarse and hard with a lack of bulk. The fabric had a pleasant feel.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention. (1)... Spool, (2)... Yarn feeding guide, (
3)...Feed roller, (4)...Heater,
(5)...10th-Ra, (6)...Heater, (
7)...20th-Ra, (8)...Heater, (9
)...false twisting spindle, al...delivery roller, Q's...winding roller, q''4...package, (F)...yarn. Patent applicant Unitika Co., Ltd. Procedure Amendment (Spontaneous 1. Indication of the case Patent Application No. 17910/1983 2, Title of the invention: Process for producing thick polyester processed yarn 3, Person making the amendment Relationship to the case Patent applicant address: 1-chome, Higashihonmachi, Amagasaki City, Hyogo Prefecture No. 50 541 Address 4-68 Kitakyutabe-cho, Higashi-ku, Osaka Name Yu
Nichika Co., Ltd. Patent Department Telephone: 06-281-52
58 (Dial-in) 4. Detailed explanation of the invention in the specification subject to amendment 5, Contents of amendment (1) Please correct "significant" in the first line of page 6 of the specification to "significant difference." (2) On page 12', line 17 of the same document, "Fineness wo" is corrected to "Fineness ga." (3) On page 13, line 11 of the same document, the phrase ``to have a yarn'' is corrected to ``to have a yarn''.

Claims (1)

[Claims] 1. The supply system is a polyester multifilament yarn with a product (X) of breaking elongation and hot water shrinkage of 10,000 or less,
After subjecting the supply system to relaxation heat treatment of 30% or more in a non-contact state to lower the birefringence index below that of the supply system without significantly increasing the degree of crystallinity, the yarn is After stretching, the product (X) of the elongation at break and the hot water shrinkage rate is 3000.
The polyester thick processed yarn is characterized in that the yarn has a thick and thin bed in the longitudinal direction of the yarn, and is subsequently false twisted at a temperature at which the yarn is fused and bonded without being stretched to a large width. manufacturing method.