JPS593575B2 - Spun yarn-like filament processed yarn and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to imparting spun yarn-like properties to thermoplastic synthetic fiber multifilament yarn, and more specifically, the present invention relates to providing a thermoplastic synthetic fiber multifilament yarn with spun yarn-like properties, and more specifically, it relates to providing a thermoplastic synthetic fiber multifilament yarn with spun yarn-like characteristics. At the same time, the purpose is to provide a random heat shrinkage difference between and within the filaments to obtain a spun yarn-like yarn, particularly a silk-spun yarn, having a yarn length difference between filaments and intertwining of the filaments.

In general, synthetic fibers have uniform properties, whereas natural fibers have partially non-uniform properties.

For example, complex changes can be observed in cross-sectional shape, fineness, crimp, etc.

It has been pointed out in various literature that this is one of the factors that gives natural fiber knitted fabrics their naturalness and unique beauty.

Furthermore, spun yarn has the added effects of single fiber migration, swelling, and fuzz, giving it unique characteristics that cannot be achieved with synthetic multifilament yarn.

Conventionally, the method of obtaining large curled yarn is knitting → heat setting →
Examples include crimped yarn using a de-knitting process or gear crimping using heated gears.

In addition, in order to obtain a crimped yarn that has both fine crimping and large crimping, a two-layer latent crimped yarn obtained by composite spinning two types of polymers is further combined with a knitting method or a gear crimp method. There is a method.

It is said that when a knitted fabric is obtained using a crimped yarn having a structure that shares large crimping, slight crimping, and large crimping, it exhibits a non-filament-like appearance with excellent bulk.

However, the conventional large crimped mixed yarns have only a slightly different appearance from filament knitted fabrics, and are not sufficient to achieve a spun-like appearance, and the means for obtaining large crimped mixed yarns is complicated and uneconomical.

On the other hand, as an approach to make multifilament yarns and their processed yarns look like spun yarns, there is a method of bringing them into contact with an abrasion body and raising them to give fluff, for example, Japanese Patent Publication No. 40-19
697, Japanese Patent Publication No. 43-14997, etc.

However, although these existing technologies achieve a spun yarn-like effect in the sense of having fluff, there is a limit to the ability of the system as a whole to exhibit silk-like characteristics such as uneven bulk and yarn unevenness. be.

As a result of various studies from these points, the present inventors applied nonuniform heat treatment to each filament of thermoplastic synthetic fiber multifilament undrawn yarn or drawn yarn to improve the degree of crystallinity, melting point, and heat treatment. By changing the shrinkage rate, etc., in the next heating-stretching/false-twisting process, loops and ununtwisted alternating twists are created due to partial fusion, heat shrinkage difference, and stretching unevenness, and then this alternating twist is unwound while being wound. We discovered that a spun yarn-like multifilament processed yarn can be obtained by this method.

Next, the configuration of the present invention will be explained in detail.

The yarn of the present invention has the following structure.

(1) By unraveling the alternate twists of the alternately twisted and curled yarn,
For example, as shown in FIG. 3, uneven slight curling and one or more types of large curling can be caused by wet heat or dry heat treatment.

(2) Furthermore, the waveforms of the apparent crimp and loop sag, particularly the half wavelength and wave height, are non-uniform between and within each filament.

(3) The waveform of the heat shrinkage curve of each filament of the constituent filaments is uneven between and within the filaments, for example as shown in FIG. The average value of
Must be above.

(4) The constituent filaments are entangled and at the same time partially fused.

In other words, in order to give spun yarn-like properties to the multifilament yarn, the alternate twists of the alternately twisted and crimped yarn are unwound, resulting in a processed yarn with a crimped structure that has both fine crimping and large crimping as shown in Figure 3. shall be.

This slight crimp and large crimp increase the dispersibility of the constituent filaments in the knitted fabric, resulting in excellent compressibility and voluminous feel, and eliminates the sliminess characteristic of filaments.

Furthermore, by making the heat shrinkage rates of each constituent filament non-uniform between and within the filament, the dispersibility between each filament is further increased during scouring and dry heat treatment of the knitted fabric, and at the same time, some filaments are more likely to appear on the surface of the knitted fabric. It has the characteristics of Fuji silk, which has a floating state and a fluffy feel, and has the warmth, flexibility, drapability, resilience, and bulkiness of the fabric, as well as the elegant luster and natural unevenness of spun yarn. Become.

In addition, if each filament is entangled and partially fused, it helps some of the filaments to float due to the difference in crimp retention and heat shrinkage, and in some cases prevents the brushed fluff from falling off. become.

Here, the heat shrinkage rate curve of each filament constituting the processed yarn was determined as follows.

First, the processed yarn of the present invention is carefully disassembled into each filament using a disassembly needle, and each filament obtained contains 0.1 f.
Marks with a width of 0.2 rran are continuously placed at intervals of 2 cm under a load of /d.

After processing the filament in a free state in a hot air dryer at 200°C for 5 minutes, a load of 0.11/d was applied to each filament, and the image was photographed using a microscope, magnified 10 times, and marked with the usual extra length. The continuous shrinkage rate of the filament at 2 cm intervals is determined by reading the distance between the filaments.

This operation was repeated for each filament to obtain a heat shrinkage rate curve as shown in FIG.

In processed yarns obtained by fluffing ordinary multifilament yarns or false twisted processed yarns using conventional techniques, this heat shrinkage rate curve is extremely uniform, and a nonuniform heat shrinkage rate waveform like the yarn of the present invention cannot be obtained.

In addition, for the multifilaments present between two lengths of the multifilament yarn in an arbitrary cross section of the processed yarn, the difference in shrinkage rate between the highest shrinkage filament and the lowest shrinkage filament determined by the heat shrinkage rate evaluation method was measured. The shrinkage rate difference is 1
If the average value of the shrinkage rate difference measured at 0 points is defined as the "average value of the heat shrinkage rate difference", in order to achieve the purpose of this application, the average value of the heat shrinkage rate difference is preferably 3% or more, and further The content is preferably 5% or more.

Further, the method for producing the spun yarn-like multifilament processed yarn according to the present invention is as follows.

(1) Non-uniform heat treatment of undrawn or drawn thermoplastic synthetic fiber yarns to provide heat reception differences between and within the filaments.

(2) When using undrawn yarn, the non-uniformly heat-treated undrawn yarn of (1) should be false-twisted at the same time as heating and stretching.

In the case of drawn yarn, heat and false twist the non-uniformly heat-treated drawn yarn in (1).

(3) Unwinding and winding the alternately twisted untwisted alternately twisted curled yarn obtained in step (2).

In the present invention, the thermoplastic synthetic fiber undrawn yarn refers to, for example, polyester fibers having a birefringence of 100 x 10-3 or less;
In the case of polyamide fibers, the waste includes semi-drawn yarns with a diameter of 30 X I F3 or less, in which oriented crystallization is not as fully formed as in ordinary drawn yarns. The filament yarn of the present invention can be sufficiently manufactured by changing the processing conditions.

One of the constituent features of the present invention is that the thermoplastic synthetic fiber undrawn yarn or drawn yarn is heated under a tension in the yarn axis direction that is less than the heat shrinkage stress of the yarn, and that the heat from the heating element is uniformly distributed to all the filaments of the yarn. The yarn is caused to contact with and pass over a heating element adjusted to receive heat below its melting point in a time shorter than the time required for the yarn to be transmitted to the filament, thereby creating internal structure differences between and within the filaments due to differences in heat reception. It's about giving.

The purpose of this treatment is to randomly change the physical properties within the filament, particularly the degree of crystallinity, shrinkage rate, thickness, melting point, etc., during subsequent steps such as heating, stretching, and false twisting.

Next, in the present invention, non-uniformly heat-treated undrawn yarns or drawn yarns that have undergone differential heat reception are subjected to false twisting at the same time as heating and stretching.
The latter imparts overt and latent random crimp when heated and false-twisted, resulting in an alternately twisted yarn having differential shrinkage loops due to the non-uniform heat treatment.

Here, when each filament is partially fused, the range of partial fusion processing conditions is extremely narrow unless the above-mentioned non-uniform heat treatment is performed, and it is virtually difficult to do so under normal production processing control conditions. .

In other words, even a slight change in heating temperature may cause no fusion or complete fusion.

By varying the melting point and shrinkage rate between and within the filaments through non-uniform heat treatment, the range of these partial fusion processing conditions is wide and stable processing can be achieved.

Furthermore, in the present invention, a spun yarn-like multifilament processed yarn having the above-mentioned properties can be obtained by unwinding the alternating twists by stretching or by the straining action/shearing action of a rubbing body, etc., and then winding the yarn.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a model diagram of a partially fused, alternately twisted, randomly shrunk yarn obtained by the intermediate stage folding process of the present invention, and FIG. 2 is a model diagram showing the partially fused state of the randomly shrunk yarn.

Undrawn yarn or drawn yarn is pre-ununiformly heat-treated to give different melting points and heat shrinkage between and within the filaments, resulting in alternately twisted yarn with a mixture of intertwining, partial fusion, and differential shrinkage loops of each filament. This is the result.

Fig. 3 is a model diagram showing the state of crimp development when the processed yarn of the present invention is subjected to dry heat treatment at 200°C for 5 minutes in a free state. It has a low shrinkage part F.

Here, slight curling l exhibits the curling form obtained by general false twisting processing, and large curling shows the curling form obtained by general false twisting processing, and large curling is the untwisted curling by alternate twisting and untwisting, or when undrawn yarn is used, undrawn yarn heating and heat setting.・It manifests as large curling caused by untwisting.

FIG. 4 shows a model of the thermal shrinkage rate curve of some filaments of the processed yarn of the present invention.

The heat shrinkage rate waveform is different between each of these filaments,
The random half wavelengths and wave heights are one of the reasons for the spun yarn-like properties.

FIG. 5 shows one embodiment of the invention.

The present invention can be carried out, for example, as follows.

The undrawn yarn or drawn yarn 2 unrolled from the undrawn yarn or drawn yarn package 1 is heated between stepped rollers 4 by a heating element 6.
The partially non-uniform heat-treated undrawn yarn or drawn yarn 7 is obtained by non-uniform heat treatment.

The undrawn yarn or drawn yarn 7, which has different melting points and shrinkage rates between and within the filaments, is heat-treated by a heating element 8 between a stepped roller 4 and a take-up roller 10, and then subjected to a false twist spinner 9.
In the case of undrawn yarn heated at the same time, each filament is drawn at the same time to give some or all of the effects of entanglement, partial fusion, actual and latent crimp, differential shrinkage loops, alternating twist, etc., to give a random shrinkage rate yarn. It becomes 12.

Further, in the present invention, the alternate twisting of the drawn random shrinkage yarn 12 is carried out in the winding machine by the alternate twisting and untwisting body 14, and the winding package 1
Wind it up to 8.

The method for unwinding the alternating twists is, for example, one that utilizes the rotation of the yarn during false twisting and untwisting, as in the alternate twisting and untwisting body 14 shown in FIG. The false twisting method is not limited to the spindle method, but may also be friction false twisting, air false twisting, etc.

Further, the winding method is not limited to the ring twisting method, and drum winding or the like may also be used.

In addition, the thermoplastic synthetic fiber undrawn yarn or drawn yarn used in the present invention may include a heat-shrinkable mixed fiber yarn, a mixed fiber yarn with a difference in melting point of different polymers, a denier mix type mixed fiber yarn, a composite yarn type yarn, etc. In general, the effect is more pronounced when two or more of these threads are used in alignment, and there are no particular limitations as long as the fibers are thermoplastic synthetic fibers.

The present invention has the following effects.

First of all, the heating element 6 heat-treats the processed yarn in order to give a difference in heat shrinkage between and within the filaments, thereby increasing the dispersibility between the filaments and at the same time increasing the dispersibility between the filaments. Uneven bulkiness is exhibited.

Therefore, the uniformity peculiar to filament knitted fabrics is achieved, and a fluffy feel and natural unevenness similar to spun yarn can be obtained.

Second, the heating element 6 provides a thermal shrinkage difference as well as a melting point difference, which provides processing stability for partially fusing the filaments in the heating, heating, and drawing process, and also prevents entanglement between the filaments. It exhibits spun yarn-like properties by imparting random crimp development, alternating twisting of differential shrinkage loops, and uneven bulk development in the yarn axis direction.

31. By unwinding the alternate twists, it is possible to economically and easily produce a crimped mixed yarn that has both slight crimping and large crimping as shown in Figure 3, and has almost no fuzz. This produces soft, bulky yarn or knitted fabric that has the fuzzy feel and warmth of spun yarn.

Next, the present invention will be explained in more detail with reference to Examples.

It should be noted that the examples given here show specific examples of the present invention, and are not intended to limit the present invention.

Example 1 An undrawn polyethylene terephthalate yarn produced by a high-speed spinning method was wound into a package 1, and heated at a heating element 6 at a temperature of 100° C. while allowing an overfeed of 9 between stepped rollers 4.
The partially non-uniformly heat-treated undrawn yarn 7 is obtained by bringing the yarn into contact with the yarn by 75M.

This heat-treated undrawn yarn 7 is transferred to a stepped roller 4 and a take-up roller 10.
The material was heated by being brought into contact with a heating element 8 at 235° C. for 300 degrees, and heated and untwisted by a false twisting spinner 9 at 2300 T/m, while being twisted by a take-up roller 10 at a surface speed of 55 m/min to 1.83 mm.
The yarn is stretched twice to obtain a stretched random shrinkage yarn 12.

Further, the yarn was brought into contact with a knife at a tension of 402/strand, and the alternate twists were unwound by squeezing, and the yarn was wound onto a drum using a tension-controlled winder.

The obtained yarn was a 155-denier processed yarn in which each filament was intertwined and partially fused, but was free of fluff and alternate twists.

Example 2 Using a polyethylene terephthalate polymer produced according to a conventional method and a copolymer in which phthalic acid was added to the acid component so that the ratio of terephthalic acid to phthalic acid was 9:1 during polymerization, Mixed fiber undrawn yarns were spun from the same pack so that individual component yarns were arranged in parallel, drawn, and wound into package 1 as a mixed fiber drawn yarn.

This drawn yarn 2 is brought into contact with a heating element 6 at a temperature of 160° C. by 75 mm between stepped rollers 4 while allowing an 8-column overfeed to form a partially non-uniformly heat-treated drawn yarn 7.

This heat-treated drawn yarn 7 is transferred to a stepped roller 4 and a take-up roller 10.
The yarn was heated by being brought into contact with a heating element 8 at 228° C. at 300 rIrm, and then heated and untwisted at 2600 T/m by a false twisting spinner 9, taken up by a take-up roller 10 at a surface speed of 51 m/min, and stretched with a random shrinkage rate yarn. Get 12.

Further, the yarn was brought into contact with a knife at a tension of 401/strand, and the alternate twists were unwound by squeezing, and the yarn was wound onto a drum using a tension-controlled winder.

The obtained yarn was a 164-denier processed yarn in which each filament was intertwined and partially fused, but without fuzz or alternate twist.

Example 3 A drawn yarn obtained by melt spinning and drawing a polyethylene terephthalate polymer produced according to a conventional method was wound into a package 1, and this drawn yarn 2 was rolled between stepped rollers 4 for 10 minutes.
% overfeed while allowing 75 mm of contact with a heating element 6 at a temperature of 200° C. to obtain a partially nonuniform heat-treated drawn yarn 7.

This heat-treated drawn yarn I is transferred to a stepped roller 4 and a take-up roller 10.
While heating and untwisting at 2600 T/m with a false twisting spinner 9, taking it off with a take-up roller 10 at a surface speed of 56 m/m1, stretching random shrinkage rate. Yarn 12 is obtained.

Further, ζ and other stretching rollers were provided to stretch the film 1.075 times.

The alternate twists were unwound and wound onto a drum using a tension-controlled winder.

The obtained yarn was a 160-denier processed yarn in which each filament was intertwined and partially fused, but without fuzz or alternate twist.

The processed yarns of Examples 1 and 2.3 were used as warp and weft yarns to make a plain weave fabric, and after free scouring and drying, 20% of the fabric was made.
Intermediate setting at 200°C for 2 minutes at 0°C dry heat free shrinkage tension of 10, followed by normal dyeing method (60 minutes at 130°C)
As a result of dyeing it in beige color and dry-heating it at 140℃ for 1 minute, the filaments of each fabric are well dispersed, resulting in bulkiness, flexibility, drapability, and resilience with natural thickness unevenness. It was a Fuji silk-like fabric with excellent fluff, warmth, and elegant luster.

[Brief explanation of the drawing]

Figure 1 is a model diagram showing a partially fused, alternately twisted, and randomly shrunk yarn obtained at an intermediate stage of the process according to the present invention, Figure 2 is a model diagram showing a partially fused state according to the present invention, and Figure 3 is a model diagram showing the partially fused yarn obtained during the process according to the present invention. A model diagram showing the state of a mixture of fine crimp and large crimp of the yarn, FIG. 4 is a diagram showing an example of the heat shrinkage rate curve of some filaments of the processed yarn of the present invention, and FIG. 5 is a diagram showing the state of the spun yarn of the present invention. It is a figure showing an example of the manufacturing method of filament processed yarn. A: Low shrinkage loop filament part, B: High shrinkage non-loop filament part, C: Partially fused part, D: Non-fused part, E:
High shrinkage filament part, F: Low shrinkage filament part, L
: large curling, t: slight curling, 1: undrawn yarn or drawn yarn package, 2: undrawn yarn or drawn yarn, 3 Ni guide,
4: stepped roller, 5: separate roller, 6: heating element,
7: Non-uniform heat treated undrawn yarn or drawn yarn, 8: Heating body 9: False twist spinner, 10: Take-up roller, 11: Separate roller, 12: Partially fused/alternately twisted/randomly shrunk drawn yarn, 13 Ni guide, 14: Alternately twisting and untwisting body, 15: Processed yarn of the present invention, 16: Traveler, 11: Winding machine, 18: Winding package.

Claims (1)

[Scope of Claims] 1. The constituent filaments of the thermoplastic synthetic fiber multifilament yarn have conspicuously non-uniform crimp and loop sag in a mixture of fine crimp and large crimp, and the heat of each constituent filament is The waveform of the shrinkage rate curve is uneven between filaments and within the filament, the average value of the difference in heat shrinkage rate between the lengths of the multifilament yarn ZCfn is 3% or more, and each constituent filament is entangled. Spun yarn-like filament processed yarn characterized by being partially fused at the same time. 2. A thermoplastic synthetic fiber multifilament undrawn yarn or drawn yarn is heated at a tension lower than the heat shrinkage stress of the yarn, and for a time shorter than the time required for the heat from the heating element to be uniformly transmitted to all filaments of the yarn. In the case of undrawn yarn, the yarn is passed through a heating element adjusted to receive heat below its melting point to give internal structural differences between and within the filaments of the yarn due to differences in heat reception. When the yarn is heated and drawn, it is partially fused and false-twisted, and in the case of drawn yarn, it is heated and partially fused and false-twisted to produce a processed yarn with partially fused alternating twists, and then the alternating twists are unwound. A method for producing spun yarn-like filament processed yarn, which is characterized by winding the yarn while winding the yarn.