JPS62125031A - Polyester false twisted crimped 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 relates to a polyester false-twisted crimped yarn having a thick fineness part and a fine fineness part in the longitudinal direction of the yarn.

(Prior art) Conventionally, a polyester multifilament yarn having a difference in fineness in the longitudinal direction of the yarn has a thick part and a fine part in the longitudinal direction, and the thick part has a low degree of orientation and has a fine fineness. Textured yarns with a high degree of orientation are known. However, such processed yarns are obtained by incompletely stretching undrawn yarns.

Although the difference in fineness is relatively large and a high thinning effect can be obtained, on the other hand,
There is a drawback in that the unstretched thick fineness portion tends to become brittle due to heat treatment such as the false twisting process and the dyeing process.

In addition, in order to eliminate the above-mentioned drawbacks during heat treatment, 1. For example, as seen in Japanese Patent Publication No. 7207/1983, unstretched portions remain randomly in the longitudinal direction of any filament constituting a multifilament yarn, and There is also known a polyester multifilament yarn in which the undrawn portions of the filament yarn as a whole are dispersed and not concentrated in the same location. In such a multifilament yarn, the filaments that make up the yarn have a fineness difference in the longitudinal direction, but the thicker and thinner parts are not concentrated, but are located randomly, and the fineness varies. Because there is little overlap between thicker parts or thinner parts, the difference in fineness between thicker and thinner yarns becomes unclear for the multifilament yarn as a whole.

Although the woven or knitted fabric obtained from this yarn exhibits a marbled shade when dyed, its presence is not obvious when it is a plain white color, and it is not suitable as a yarn for woven or knitted fabrics that have a rich texture. Not.

Furthermore, the present applicant has disclosed a method for manufacturing a thick and thin crimped yarn by subjecting a highly oriented undrawn polyester yarn to a relaxing heat treatment, and then stretching and false twisting the yarn with intermittent heat treatment. This method was proposed in the publication, but the thick and fine yarn obtained by this method has a large difference in heat shrinkability between the thick and fine fineness areas.

The fabric obtained from this large fine yarn is 9.During the normal dyeing process, twitch-like unevenness (1), for example, the unevenness of a soccer-like fabric, which is caused by an excessive shrinkage difference between the thick and fine fineness areas, is produced. easy. These twitch-like irregularities cannot be eliminated even if a tension treatment is performed in the finishing heat setting step after the dyeing step. In order to eliminate this twitch-like unevenness, it is necessary to heat set the fabric before the dyeing process, or to dye it in a taut and widened state, and in terms of texture, the roughness and hardness cannot be eliminated.

Furthermore, the number of steps was increased and it was complicated.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned drawbacks of the conventional large fine yarn, and its purpose is to create twitch-like unevenness when it is made into a woven or knitted fabric. The object of the present invention is to provide a polyester false-twisted crimped yarn that does not cause any twisting.

(Means for Solving the Problems) That is, the present invention is a polyester multifilament false twisted crimped yarn having thick fineness portions and fine fineness portions alternately along the longitudinal direction of the yarn, wherein the thick fineness portions are The gist of the invention is a polyester false-twisted crimped yarn characterized in that the difference in heat shrinkage rate between the fine-grained portion and the fine-grained portion is 10% or less.

Hereinafter, one aspect of the present invention will be explained in detail.

First, the false-twisted crimped yarn of the present invention is made of a false-twisted crimped yarn of polyester multifilament yarn, which has alternating thick and fine fineness sections in the longitudinal direction of the yarn.

The difference in heat shrinkage rate between the thick fineness part and the fine fineness part is 10% or less, and the difference in heat shrinkage rate in the longitudinal direction of the yarn is small.

In the present invention, it is necessary that the difference in heat shrinkage rate between the thick part and the fine part is 10% or less.

If the difference in heat shrinkage rate exceeds 10%, when this is made into a woven or knitted fabric and then subjected to heat treatment such as a dyeing process.

This is not preferable because the thicker fineness portion shrinks significantly and the difference in shrinkage from the finer fineness portion causes twitch-like unevenness to be formed on the surface of the fabric. For example, if the above heat treatment is applied after making a +@ fabric, so-called soccer-like unevenness tends to occur, and if the above heat treatment is applied after making a single knit fabric, the stitch loops made up of thicker parts will become finer. This is not preferable because the first stitch is partially dense because it contracts more than the stitch loop made up of the fineness portion, resulting in twitch-like unevenness.

In the present invention, the heat shrinkage rate itself is not particularly limited (it is appropriately selected depending on the application. For example, it is selected in consideration of the density of the m-knitted fabric, etc.).

It is preferable that the yarn diameter ratio between the thick part and the fine part of the false twisted crimped yarn of the present invention is 1.2 or more from the viewpoint of the thick and fine effect. There is no particular upper limit on the yarn diameter ratio between the thick and fine fineness portions, but if this yarn diameter ratio becomes too large, the passability during subsequent processes such as knitting and weaving may decrease, and the abrasion resistance of the resulting fabric may decrease. Since there is a possibility that the value of

Next, two false twisted crimped yarns of the present invention will be explained based on the drawings.

FIG. 1 is a schematic side view showing an example of a false twisted crimped yarn of the present invention, in which a thick part a consisting of a thick part of the filament and a thin part of the filament are formed along the longitudinal direction of the yarn. The thicker fineness parts a have a higher heat shrinkage rate, and the finer fineness parts have a smaller heat shrinkage rate than the thicker fineness parts a, and there is a difference in the heat shrinkage rate between the two. is less than 10%.

Furthermore, as shown in FIG. 2, the filament in the portion constituting the thick fineness section a is not substantially torsionally deformed due to false twisting, and its cross section is hardly deformed. . On the other hand, as shown in FIG. 3, the filament in the portion constituting the fineness portion has undergone deformation due to weeping deformation due to false twisting, and its cross section has been deformed and has crimps.

As mentioned above, the filaments in the part constituting the thick fineness part a are not substantially torsionally deformed due to false twisting, and the filaments in the part constituting the fine fineness part a are not subjected to torsional deformation due to false twisting. When the cross-section is deformed and has crimps, the thick part a and the fine part A compete against each other, making it difficult for conventional false twisted crimped yarns made of large fine yarns to It exhibits an excellent unevenness effect that is not seen before, and when it is made into a woven or knitted fabric, it gives a soft volume feeling due to the fineness of the crimped part. In addition, false-twisted crimped yarn is obtained by false-twisting a large fine yarn obtained by incompletely drawing a conventional undrawn yarn. As it undergoes twisting deformation, the thick fineness part is also stretched and its thickness decreases, which has the disadvantage that the thinning effect is extremely reduced. In other words, if there is no tear deformation due to false twisting, or even if there is, the degree of deformation is small, the yarn diameter ratio of the thick part A and the fine part A should be set sufficiently. It can be maintained and shows excellent unevenness effect.

Next, two methods for producing the false twisted crimped yarn of the present invention will be explained.

The false twisted crimped yarn of the present invention is manufactured, for example, as follows. First, the birefringence Δn is 15×10−′ to 80×10−
The highly oriented undrawn polyester yarn of 3 is subjected to relaxation heat treatment at a relaxation rate of 30% or more, preferably 50% or more, without contacting with a heating device. 2. Next, water or an aqueous liquid is intermittently applied to the relaxation heat-treated yarn. Condition 2: The part to which water or an aqueous liquid is applied does not undergo stretch false twist deformation without being continuously brought into contact with a heating device.For example, the stretching ratio is 1.5 or more.

The number of false twists is 2300 times/m, and the temperature of false twisting is 1. False twisting is performed, and then the lead part is heated in a heat treatment device.

In this way, when producing the tentatively crimped yarn of the present invention, since the highly oriented undrawn polyester yarn has high heat shrinkability, it is necessary to perform a relaxation heat treatment with a relaxation rate of 30% or more. , the yarn is thickened so that large differences in fineness can be expressed by the subsequent drawing and false twisting process.Then, the yarn that has been made thick by the relaxation heat treatment is intermittently coated with water or an aqueous liquid, and then stretched. Since it is false-twisted, the part to which water or aqueous liquid is attached is not heated during stretching and false-twisting, so it becomes an extremely thick and thick part without being subjected to stretching or false-twisting deformation.On the other hand, water or aqueous liquid The portions to which the liquid is not attached are sufficiently heated and undergo torsional deformation due to false twisting at the same time as stretching, resulting in fine fineness portions having crimps.

In this case, in order to prevent the thick fineness part from being torsionally deformed due to false twisting, it is necessary to perform stretching false twisting at the same time as forming the thick fineness part, and the part to which water or aqueous liquid has adhered will not be attached. It constitutes a large fineness part that is less susceptible to deformation than the part without it. Stretching and false twisting are concentrated on the portion to which water or aqueous liquid is not attached, resulting in a fine-grained portion that has undergone torsional deformation.

The false-twisted crimped yarn that has been drawn and false-twisted as described above is heat-treated, and the temperature of this heat treatment is preferably higher than the heating temperature during the drawn-false-twisting process.

In addition to the features of the present invention described above, the false-twisted crimped yarn obtained as described above does not become brittle in its thick fineness portion even when subjected to heat treatment such as dyeing.

Next, a method for manufacturing a false twisted crimped yarn according to the present invention will be explained based on the drawings.

FIG. 4 is a process schematic diagram showing an example of the method for producing a false twisted crimped yarn of the present invention, in which the yarn F pulled out from the highly oriented polyester undrawn yarn spool 1 is guided through the guide 2. After passing through the feed roller 3, the feed roller 3 and the first delivery d-ra 5
The material enters the first heating device 4 while being overfed by the material, and is thermally shrunk at a predetermined relaxation rate. Next, it is sent to the stretching false twisting area via the first delivery roller 5, and water or an aqueous liquid is intermittently applied by the liquid adhesion device 6.
It is stretched at a predetermined stretching ratio between the first delivery roller 5 and the second delivery roller 9, and simultaneously heated by the false twisting device 8 and heat-set by the second heating device 7 in a non-contact state. moreover.

It passes through the second delivery roller 9, is heat-treated by the third heating device 10, passes through the third delivery roller 11, and is wound up into a package 13 by the winding roller 12 as a false twisted crimped yarn.

Next, two other examples of the method for producing the false twisted crimped yarn of the present invention will be described.

FIG. 5 is a process schematic diagram showing another example of the method for producing the false twisted crimped yarn of the present invention, in which the yarn F pulled out from the highly oriented polyester undrawn yarn spool 1 is guided through the guide 2. After passing through the feed roller 3, it enters the first heating device 4 while being overfed by the feed roller 3 and the first delivery roller 5, and is thermally shrunk at a predetermined relaxation rate. Then the first
It passes through the delivery roller 5 and is sent to the stretching false twisting area.

Here, the first delivery roller 5 and the second delivery roller 9
The moving guide 15, which reciprocates at right angles to the running direction of the yarn by turning on and off the air cylinder 14, causes the yarn to traverse and intermittently contact the second heating device 7, while the first delivery roller 5 and the first delivery roller 2 Delivery roller 9
At the same time, it is stretched at a predetermined stretching ratio and heat-set by a false twisting device 8, passed through a second delivery roller 9, heat-treated by a third heating device 10, passed through a third pre-heli roller 11, and then wound up. The yarn is wound up into a package 13 by rollers 12 as a false twisted crimped yarn.

In the present invention, the thread diameter ratio is 3 under a load of 0.3 g/d.
The yarn was twisted at a rate of 0.00 twists/m, and the yarn diameters of the thick and fine fineness portions were measured using a scaled microscope.

It is the yarn diameter of the thick fineness section divided by the yarn diameter of the fine fineness section.

In addition, the heat shrinkage rate (%) is 0.1 g /
Marks were placed at 5 cm intervals in the center of the thick part under a load of 0.d, and after boiling in boiling water for 30 minutes in a free state, air-dried for 24 hours and marked under a load of 0.1 g/d. Measure the length L (cm) between them.

It is expressed as (5-L)/5×100(%).

On the other hand, the fine fineness portion is expressed by selecting a location where there is no thick fineness portion and measuring in the same manner as in the case of the thick fineness portion.

(Example) Next, the false twisted crimped yarn of the present invention will be specifically explained with reference to an example.

Example Highly oriented undrawn polyester yarn 1 with birefringence of 51 x 10-' obtained by high speed spinning of polyethylene terephthalate
Two false twisted textured yarns of the present invention were manufactured using 10d/36f according to the process shown in FIG. 4 and under the conditions shown in Table 1.

The false twisted crimped yarn obtained in Table 1 was a large fine yarn having alternating thick and fine fineness areas, and the yarn diameter ratio of the thick and fine fineness areas was 1.5.

For comparison, a false twisted crimped yarn that had not been heat-treated immediately after exiting the second delivery roller was collected.

The heat shrinkage rates of the above-mentioned false twisted crimped yarn of the present invention and the false twisted crimped yarn for comparison were measured. 10.0% and 6.
0%, and the difference in heat shrinkage rate was 4.0%. On the other hand, the comparison false twisted crimped yarn had a heat shrinkage rate of 28.0% and a fineness part of 28.0% and 10.0%, respectively, and the difference in heat shrinkage rate was 18.0%. .

The thick and thin false twisted crimped yarn of the present invention was additionally twisted at 2000 times/m in the S and Z directions, with a warp density of 74 pieces/in.
The weft density is 68 threads/in, and both the warp and weft are S-twisted and Z-twisted.
Two twisted yarns were arranged alternately and woven into a plain weave. Next, when the product was finished according to the usual dyeing recipe for polyester fibers, it had a slub-like thick and thin effect and a Kasuri-like effect.

On the other hand, a false twisted crimped yarn for comparison was prepared in the same manner as above.

When the product was finished, it had soccer-like twitching irregularities.

(Effects of the Invention) Since the false twisted crimped yarn of the present invention has the above-mentioned configuration, the difference in heat shrinkage between the thick and fine fineness portions is small, and it can be used as a woven or knitted fabric. It does not sometimes cause twitch-like unevenness, and has a preferable thick-to-thin effect due to the difference in thickness.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an example of the false twisted crimped yarn of the present invention;
Figure 2 is a cross-sectional view of the large fineness portion of the false twisted crimped yarn of the present invention;
The figure is a sectional view of the fineness part of the false twisted crimped yarn of the present invention, FIG. 4 is a process schematic diagram showing an example of the method for producing the false twisted crimped yarn of the present invention, and FIG. It is a process schematic diagram which shows another example of the manufacturing method of a crimped yarn. a; Thick fineness part, b; Fine fineness part

Claims (2)

[Claims] (1) A polyester multifilament false twisted crimped yarn having thick and fine fineness sections alternately along the longitudinal direction of the yarn, where the difference in heat shrinkage rate between the thick and fine fineness sections is 10%.
A polyester false twisted crimped yarn characterized by the following: (2) The filaments that make up the thick part are not substantially torsionally deformed by false twisting, and the filaments that make up the fine part are deformed in cross section by torsional deformation due to false twisting, and become crimped. The polyester false twisted crimped yarn according to claim 1, which has the following.