JPH062967B2 - Method for producing thick and thin polyester crimped yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a polyester crimped yarn having a difference in fineness and a crimp in the longitudinal direction of a yarn, and more specifically, to a polyester highly oriented unstretched yarn. After the yarn is heat-treated for relaxation, water or an aqueous liquid is intermittently adhered to it and continuously drawn and false-twisted to form a yarn having an extremely large fineness difference. Alternatively, by removing the aqueous liquid and bringing the heat shrinkage performance of the thick part and the small part of the yarn close to each other, the woven and knitted fabric obtained from this processed yarn has a soccer-like unevenness even if it is subjected to a heat treatment such as a dyeing finishing process. The present invention relates to a method for producing a polyester crimped yarn having a large and small thickness, which can obtain a smooth product free from defects.

<Prior Art> Conventionally, a method for producing a polyester yarn having a thick portion and details along the longitudinal direction of the yarn has been already known, and for example, birefringence (Δn) is 0.5 to 10 × 10 ^−3. A method is known in which an undrawn yarn of a certain degree is used as a supply yarn and this is incompletely drawn. However, the thick and thin polyester yarn obtained in this way has an outer diameter ratio (thickness / thinness ratio) between the thick part and the details.
On the other hand, there is a drawback in that the degree of orientation of the thick portion is too low, so that it tends to be embrittled by thermal processing such as false twisting process and dyeing process.

For this reason, a method of producing a polyester yarn having a large thinness by using a highly oriented undrawn yarn having a birefringence (Δn) of about 15 to 80 × 10 ⁻³ as a supply yarn is also known. For example, as described in JP-B-38-2018, JP-B-38-2019, and JP-B-42-27563, a mechanical method for periodically deforming a yarn using a deforming roller, Although the method of manufacturing by drawing at a draw ratio less than or equal to the natural draw ratio eliminates the problem of thermal embrittlement during processing, since the outer diameter of the thick part cannot exceed the outer diameter of the supplied yarn, Only a yarn with a small ratio can be obtained, and there is a disadvantage that the thick and thin effect of the yarn cannot be exhibited in the white plain product.

In order to overcome the drawbacks of the conventional method, the present applicant first performed shrinkage heat treatment on highly oriented polyester unoriented yarn, and then intermittently adhered water or aqueous liquid to which water or aqueous liquid adhered. A thick detail in which a portion is a thick portion is proposed in JP-A-59-172939.

Although this thick thin yarn eliminates the above-mentioned drawbacks, the thick thin yarn has a large difference in heat shrinkage performance between the thick portion and the detail. As a result, the soccer-like unevenness did not disappear even if tension treatment was performed in the finishing heat setting step after the dyeing step. For this reason, it is necessary to perform heat setting in advance before the dyeing process or to dye in a state where the tension is widened. Therefore, it is not possible to wipe out the feeling of coarseness in terms of feeling and it is complicated in the process. That left a problem.

<Problems to be Solved by the Invention> The present invention solves the drawbacks of the conventional methods as described above, and the purpose thereof is to have a clear thick and thin, and a thick portion and a detail. It is to produce a thick and thin polyester crimped yarn that can obtain a woven and knitted fabric having no soccer-like unevenness due to the difference in heat shrinkage performance between the crimped yarn and the crimped yarn.

<Means for Solving Problems> That is, in the present invention, the birefringence (Δn) is 15 to 80 × 10.
^-3 Polyester highly oriented undrawn yarn is subjected to relaxation heat treatment, then water or an aqueous liquid is intermittently adhered to the yarn, and then continuously drawn with a heating device in a non-contact state, and then water is drawn. Or, after making the part where the aqueous liquid adheres to the thick part and the part where the water or aqueous liquid does not adhere to the detail, heat-treat to vaporize the water or the aqueous liquid remaining in the thick part of the strip at the same time. A method for producing a polyester crimped yarn having a thin and thin shape, characterized in that the thick portion is heated so that the difference in hot water shrinkage between the thick portion and the small portion is 10% or less.

Hereinafter, the present invention will be described in more detail.

First, in the method of the present invention, the birefringence (Δn) is 15 to
The 80 × 10 ⁻³ highly oriented polyester unoriented yarn is subjected to relaxation heat treatment. In this case, if the birefringence (Δn) of the polyester highly oriented undrawn yarn is less than 15 × 10 ⁻³ , the yarn may be fused during the relaxation heat treatment, or the thick portion of the yarn may become brittle during post-processing such as dyeing processing. Not preferable. On the other hand, when the birefringence (Δn) exceeds 15 to 80 × 10 ^-3 , the orientation degree becomes close to that of the drawn yarn, the shrinkage amount during relaxation heat treatment becomes extremely small, and the yarn thickness ratio becomes large. It's not suitable because it doesn't exist.

The relaxation heat treatment of the polyester highly oriented undrawn yarn is preferably performed in a state where it does not contact a heating device. If the yarn is run while the relaxation heat treatment is in contact with the heating device,
This is because tension is applied to the single-filament filament due to contact resistance, the single-filament filament cannot freely contract, and unevenness in orientation and crystallinity occurs in the yarn.

If the relaxation rate of the relaxation heat treatment is increased, the thickness ratio can be increased, but it is preferably 30 to 150% practically in relation to the heat shrinkage performance of the supplied raw yarn.
The term "relaxation rate" as used herein refers to the ratio of the difference between the supply speed and the take-up speed to the take-up speed, expressed as a percentage.

The processing temperature during the relaxation heat treatment depends on the relaxation rate and the yarn speed, but the relaxation rate is 30 to 150% and the yarn speed is 80 to 200 m / mi.
In the range of n, it is preferably 120 to 230 ° C.

Next, in the method of the present invention, water or an aqueous liquid is intermittently adhered to the yarn subjected to the relaxation heat treatment. Here, the aqueous liquid contains water in an amount of 50% by weight or more, and examples of the substance other than water include a surfactant, a dyeing aid, and a rust preventive.

To intermittently attach water or an aqueous liquid (hereinafter referred to as a liquid) to the relaxation heat treated yarn, a method of attaching using a gear type deformable rotating roller having a protrusion on the roller surface, an electromagnetic solenoid intermittent Any method may be used as long as it can intermittently adhere the liquid to the yarn for a proper length, such as a method of contacting and adhering the liquid adhered to the roller surface by reciprocating motion, and in particular, a microcomputer and a random method. The method of using the pulse generating unit together is particularly preferable because the liquid can be deposited at random intervals and lengths.

Then, as described above, the yarn to which the liquid was intermittently adhered was continuously subjected to draw false twisting in a non-contact state with the heating device, and the liquid adhered portion was thickened and the liquid adhered. The details are those that have not been done. In this case, when the drawn false-twisting process is performed by contacting with a heating device, the liquid evaporates, and the part to which the liquid adheres receives the same heat action as the part to which the liquid does not adhere, and the twisting due to the similar drawn false-twist As a result of being deformed, it is not possible to obtain the crimped yarn having a large thick-fineness ratio, which is the object of the present invention. The temperature of the heating device in this case depends on the speed of application, but is preferably 140 ° C. to 230 ° C. in the range of a yarn speed of 80 to 200 m / min.

If it exceeds, the non-heat-treated portion is also deformed by stretching and temporary heating, and as a result, the non-heat-treated portion is unlikely to become a thick portion, which is not preferable. Here, d (denier) is the fineness d of the raw yarn to be supplied.
₁ (denier), the relaxation rate during relaxation heat treatment was S% (%), the draw ratio was D, and it was calculated from d = d ₁ (1 + S / 100) / D.

In addition, the stretching ratio (D) in the stretching heat treatment is (1 + S / 100) to 1.5 with respect to the relaxation rate (S)% in the relaxation heat treatment.
It is preferably (1 + S / 100). If the draw ratio (D) is outside the above range, yarn breakage is likely to occur and the operability during processing is reduced, which is not preferable.

The liquid-attached portion of the yarn thus obtained is not subjected to the heat action during the drawing false twisting process and is not subjected to the draw false twisting deformation, so that it becomes a thick portion with an extremely large fineness, while the part to which the liquid is not attached is As a result of being subjected to heat and twisting deformation of false twist, it becomes a detail having crimps, and thus the obtained yarn becomes a crimped yarn having a large fineness with an extremely large fineness to fineness ratio.

Further, in the method of the present invention, the yarn subjected to the draw false twisting process is subjected to a heat treatment to vaporize the liquid remaining in the thick portion of the yarn and simultaneously heat the thick portion, and the hot water of the thick portion and the fine portion is heated. The difference in shrinkage is 10% or less. That is, since the portion of the yarn to which the liquid is adhered is not subjected to the heat effect due to the heat blocking effect of the liquid during the drawing false twisting process, it has a larger heat shrinkage force than the portion to which the liquid is not adhered. Therefore, when the fabric is subjected to a heat treatment such as a dyeing process, the thick part to which the liquid is attached contracts remarkably, and the difference in contraction between the thick part to which the liquid is not attached causes a soccer-like appearance on the fabric surface. Unevenness is formed. Further, when the knitted fabric is subjected to the dyeing process, the stitch loop formed by the thick portion contracts more remarkably than the stitch loop formed by the details, so that the surface of the fabric becomes uneven. Therefore, in the method of the present invention, further heat treatment is not performed to receive sufficient heat in the drawing false twisting process, and the thick portion where the liquid remains is heated to first vaporize the remaining liquid. After that, heat treatment is performed at a predetermined heating temperature to reduce the heat shrinkability. In this case, when the heating device is not in contact with the heating device, the liquid remaining on the yarn running at high speed cannot be sufficiently removed. Therefore, it has a sufficient heat capacity to surely vaporize the remaining liquid.
It is preferable to perform heat treatment by contacting with a heating device at 0 ° C. or higher.

The temperature of this heat treatment is preferably higher than the heating temperature in the drawing false twisting process, and a temperature of 170 ° C to 240 ° C is particularly preferable.

The supply rate at the time of heat treatment may be in a tensioned or relaxed state, but the supply rate should be adjusted so that it does not stretch too much and the thick part is stretched, and that it does not loosen too much and the yarn shakes. It suffices to select it, and it is suitable that the overfeed rate is generally -10% to 30%, preferably 0 to 15%.

Thus, the difference in hot water shrinkage between the thick part and the detail is set to 10% or less, but if the difference in hot water shrinkage exceeds 10%, the fabric obtained from the crimped yarn will undergo heat shrinkage during dyeing. This causes a soccer-like unevenness on the fabric surface, which is not preferable. When the difference in the hot water shrinkage is 10% or less as in the present invention, the soccer-like unevenness does not occur on the fabric, or even if it occurs, it is a slight wrinkle, and a normal finishing process is sufficient. It can be corrected.

FIG. 2 is a schematic view showing an example of a crimped yarn having a large and small thickness according to the method of the present invention. In FIG. 2 (a), a liquid is attached and is subjected to draw false twist deformation in a draw false twist process. The thick part where the liquid is vaporized by the heat treatment without heat treatment, and (b) are the details that have crimps that have undergone draw false twist deformation in the draw false twist process without attaching the liquid. These thick parts (a) and detail ( The difference in hot water shrinkage with b) is less than 10%, and the thick part (a) and detail (b)
And are formed along the longitudinal direction of the yarn.

FIG. 1 is a process schematic view showing an example of the manufacturing process of the present invention. The polyester highly oriented undrawn yarn (F) drawn from the spool (1) passes through a guide (2) and a feed roller.
After passing through (3), enter the first heating device (4), and feed roller (3)
And the first delivery roller (5) heat-shrinks it at a predetermined relaxation rate, and then it is sent to the drawing false twist region through the first delivery roller (5), and the liquid application device (6) intermittently liquids it with a random signal by a microcomputer. And is then stretched at a predetermined stretching ratio between the first delivery roller (5) and the second delivery roller (9),
The second heating device (7) while being twisted by the false twisting device (8)
Is heat-fixed in a non-contact state by the second delivery roller
After passing through (9), it is heat-treated by a third heating device (10), passed through a third delivery roller (11), and then wound by a winding roller (12) into a package (13) as crimped yarn having a thin and thin shape.

The polyester in the present invention is a generic name for polyesters having an ester bond in the molecular chain represented by polyethylene terephthalate, and also includes modified polyesters containing a third component such as isophthalic acid and paraoxyethoxybenzoic acid.

Further, the birefringence (Δn) is a value measured by an interference fringe measuring method using a polarization microscope compensator.

Regarding the hot water shrinkage ratio, for the thick part, a thread is collected with a length of about 30 cm centering on the thick part, and a mark of 5 cm intervals is attached to the thick part under a load of 0.1 g / d, and it is free. After heat-treating in boiling water for 30 minutes, air-dry for 24 hours, 0.1g
Measure the length (l) between the marks under a load of
/ 5 × 100 (%). On the other hand, the details are shown by selecting a portion where the thick portion does not exist and measuring the same as in the case of the thick portion.

<Examples> Hereinafter, the method of the present invention will be specifically described with reference to Examples.

Example A polyester highly oriented undrawn yarn 110d / 36f having a birefringence (Δn) of 51 × 10 ⁻³ obtained by high speed spinning was processed according to the present invention under the processing conditions shown in Table 1 according to the process shown in FIG. A crimped yarn having a large thickness was produced by the method.

The obtained crimped yarn was a crimped yarn having the thick portions and details shown in Table 2 in the longitudinal direction at a predetermined length and at intervals. In addition, the thread diameter of the thick part and the detail is 300T under the load of 0.3g / d.
/ M twist was applied to the yarn and measured with a microscope equipped with a scale.

Table 3 shows the results of measuring the hot water shrinkage of the crimped yarn and the unheated yarn collected after the second delivery roller.

This crimped yarn with a thickness of 2000 is applied in the S and Z directions.
After twisting T / M, warp density is 88 pieces / inch, weft density is 74 pieces / inch, and weave into a plain georgette fabric with S and Z of 2: 2 in both directions. As a result, a product having a difference in dyeing density and no soccer-like unevenness was obtained. Even in bleaching,
It had a thick and thin effect.

<Effects of the Invention> As described above, according to the method of the present invention, the polyester highly oriented unstretched yarn is subjected to relaxation heat treatment, and then the liquid is intermittently adhered to it.
Since the drawn false-twisting process is subsequently performed, it is possible to make the thick portion of the obtained crimped yarn larger than the fineness of the feed raw yarn, and the thick and thin crimped yarn having an extremely large fineness to fineness ratio. Can be obtained.

Moreover, since the heat-shrinking ability of the thick portion is made to be about the same as that of the fine portion by performing further heat treatment after the drawing false-twist processing, there is little difference in shrinkage between the thick portion and the fine portion even in the dyeing process. ， No soccer-like unevenness is generated.

Moreover, in the method of the present invention, since the fineness unevenness of the yarn is revealed by intermittent liquid adhesion, it is possible to arbitrarily adjust the liquid adhesion by using a microcomputer, and the woven or knitted fabric can be adjusted. The crimped yarn whose pattern pattern and texture can be freely changed can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a schematic process diagram showing an example of the manufacturing process of the method of the present invention, and FIG. 2 is a schematic view of the appearance of crimped yarn having a thickness according to the method of the present invention. DESCRIPTION OF SYMBOLS 1 ... Spool 3 ... Feed roller 4 ... 1st heating apparatus 5 ... 1st delivery roller 6 ... Liquid application apparatus 7 ... 2nd heating apparatus 8 ... False twisting apparatus 9 ... 2nd delivery roller 10 ... 3rd heating apparatus 11 ... 3 Delivery roller 12… Winding roller 13… Package

Claims (2)

[Claims] 1. A polyester highly oriented undrawn yarn having a birefringence (Δn) of 15 to 80 × 10 ⁻³ is subjected to a relaxation heat treatment, and then water or an aqueous liquid is intermittently adhered to the yarn, followed by continuous continuation. After applying false twisting to the heating device in a non-contact state, the part where water or aqueous liquid is attached becomes the thick part, and the part where water or aqueous liquid is not attached becomes the detail, then heat treatment is applied to the yarn. Polyester having a large and small thickness, characterized in that the water or the aqueous liquid remaining in the thick part of the strip is vaporized and at the same time the thick part is heated so that the difference in hot water shrinkage between the thick part and the detail is 10% or less. Method for producing crimped yarn. 2. The method for producing a thick and thin polyester crimped yarn according to claim 1, wherein the heat treatment is performed in a state where the yarn is in contact with a heating device.