JPH02169738A - Production of bulky nylon yarn - Google Patents

Abstract

PURPOSE:To obtain the subject yarn having specific boiling water shrinkage difference and yarn length difference and suitable for wind breaker, etc., as a cloth having spun-like feeling by simultaneously drawing a heat-set yarn and a yarn free from heat-setting at equal draw ratios. CONSTITUTION:Undrawn nylon yarns A1 and A2 are supplied to a feed roller 1. The yarn A1 is made to contact with a hot plate 3 while the yarn A2 is hooked to a guide 4 and left in the state free from heat-treatment. Both yarns are drawn with a draw roller 2 and wound with a winder 5 to obtain the objective yarn composed of a pair of mutually entangled yarns having a boiling water shrinkage difference of >=2% and a yarn length difference of >=2%.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing nylon bulky yarn that can still exhibit bulkiness even after being made into a fabric of 11\iA or the like. More specifically, the present invention relates to the production of a nylon bulky yarn comprising a nylon high-shrinkage fiber as a core yarn and a nylon low-shrinkage fiber as a sheath yarn, and characterized by the sheath yarn forming a slack portion. Regarding the method.

<Prior Art> False twisting, air bulking (usually taslan processing), and the like are widely known as means for imparting bulk to yarn.

However, the speed of false twisting or air bulking is generally slower than the stretching speed, and there is still room for improvement in terms of productivity. In this regard, JP-A-63-
Publication No. 159540 describes that other fibers are supplied to the yarn immediately after being drawn and the two are mixed together. A bulky mixed fiber yarn has been proposed in which a stable yarn structure is formed between the drawn yarn and the drawn yarn. In this proposal, the same productivity as the drawing speed can be obtained in terms of processing speed, but on the other hand, it is difficult to match the yarn length because the feeding system and the drawn yarn are different.

There are problems such as a sense of incongruity due to the difference in form, dye matching, etc., and equipment compatibility such as the need for different supply rollers.

<Object of the Invention> An object of the present invention is to provide a bulky yarn that is made of substantially the same material during a drawing operation, does not give a strange feeling, and does not have the above-mentioned additional considerations.

<Structure of the Invention> The present inventor has made use of the difference in elongation elasticity recovery characteristic of synthetic fibers, especially nylon fibers, depending on the presence or absence of heat treatment. By making it a bulky yarn, this purpose was achieved.

Thus, according to the present invention, (1) when drawing two undrawn nylon yarns in a drawing zone that shares a heating supply roller and a drawing roller, one of the undrawn yarns is set by drawing heat, and the other undrawn yarn is set by drawing heat; A nylon bulky yarn characterized in that both yarns are stretched at the same stretching ratio without being heat set, and a boiling water shrinkage difference of 2% or more and a yarn foot difference of 2% or more are imparted between the two yarns. Manufacturing method and (When drawing two nylon undrawn yarns in a drawing zone that shares two heating supply rollers and a drawing roller, one undrawn yarn is set by drawing heat, and the other undrawn thread is set by heat setting. After stretching both at the same stretching ratio without applying any overfeeding, and giving a boiling water shrinkage difference of 2% or more and a yarn foot difference of 2% or more between them, the following Introduce the air into the nozzle to create loops and slack in the yarn.

A method for manufacturing bulky nylon yarn characterized by imparting entanglement. A slit section is provided that is parallel to and penetrates the air nozzle yarn passage hole, and a three-dimensional air injection hole is symmetrical to this slit section at an angle of 90°. Accordingly, there is provided an air nozzle having a tapered thread guide hole whose exit side is widened.

As is clear from this, the present invention provides a bulky yarn with a conventional fresh water shrinkage rate difference (hereinafter referred to as shrinkage difference) and a yarn foot difference at a low cost by using a drawing process. The main element is to provide a shrinkage difference by drawing a yarn that is heat-set during stretching to have a low shrinkage and a yarn that is not heat-set and has a high shrinkage, by stretching them in the same device at the same stretching ratio. The other yarn foot difference utilizes the fact that the elongation elastic recovery rate between yarns varies widely depending on the presence or absence of heat setting. In particular, the nylon fiber used in the present invention shows a remarkable tendency. That is, the heat-set low-shrinkage yarn has little internal strain, is stable, and has a low elongation elastic recovery rate. On the other hand, high shrinkage yarns that are not heat-set have a large internal strain and are unstable, resulting in a high elongation elastic recovery rate. This is because the yarn length is different between the low-shrinkage yarn and the high-shrinkage yarn immediately after stretching (when the yarn leaves the stretching roller), and the core portion of the high-shrinkage yarn and the sheath (sag) of the low-shrinkage yarn. This means that a portion of fiber (fiber) is generated. In general, nylon fibers are difficult to heat set and shrinkage tends not to decrease. Therefore, there are many combinations of shrinkage differences in the high shrinkage range (shrinkage rate of 8% or more). If a fabric is composed of a combination of yarns in a high shrinkage range, and the heat treatment in the dyeing and finishing process attempts to produce a difference in shrinkage, the yarns will be restrained within the fabric structure and the tension applied during fabric manufacturing. As a result, the difference in shrinkage is not sufficiently expressed, resulting in a smooth fabric. Naturally, when the difference in shrinkage of yarns is small, the above-mentioned phenomenon can hardly be expected. In this regard, in the present invention, low shrinkage yarn (6% or less) and high shrinkage yarn (8%
In addition to combinations with the above), even combinations of yarns in the high shrinkage range have sufficient sheath (slack fibers) and the yarns are less likely to be bundled, so the shrinkage difference can be reduced by heat treatment in the fabric dyeing and finishing process. can be expressed. Furthermore, the actual bulkiness resulting from the yarn foot difference also acts as a synergistic effect, contributing to further improvement in bulkiness.

Hereinafter, the present invention will be described with reference to the accompanying drawings. FIG. 1 is a process schematic diagram showing an example of the method of the present invention, in which nylon undrawn yarn △1 (hereinafter referred to as yarn A1) and yarn Nylon undrawn yarn A2 (hereinafter referred to as
The yarn A2 is simultaneously supplied to the supply roller (1), and then to the drawing roller (2. At this time, the yarn A1
The yarn 2 is attached to the heating plate (3), while the yarn 2 is simply attached to the guide (4) without being attached to the heating plate (3).
), and both yarns A+ and A2 are stretched with a stretching roller (2) and then wound into a burn shape with a winding device (5) to obtain a nylon bulky yarn (6).The stretching ratio in this case is may be adjusted to 0.4 to 0.8 times the cutting elongation of yarn A+A2.If the draw ratio is low, the difference in yarn length will increase, but the residual elongation will increase, and when made into a fabric, it may cause folds to fall out or This causes the yarn to be difficult to handle at the knees, and at the same time, it is difficult to reduce the shrinkage rate.On the other hand, as the stretching ratio increases, the yarn foot difference decreases, and conversely, the shrinkage rate tends to decrease overall.

Here, regarding the heat setting effect of the heating plate,
As shown in FIG. 3, as the heating plate temperature increases, the yarn foot difference increases, and the shrinkage difference also increases.

In addition, the above-mentioned thread length difference and shrinkage difference are in accordance with the following definitions.

The thread end of the wound nylon bulky thread (6) is taken out and fixed with adhesive tape. Then apply 0.02 IR per denier approximately 30 cm from the point of adhesion.
After hanging a load of g, exactly 10 cm from the previous gluing point.
After marking the location, remove the load that was applied earlier. Next, separate yarn A1 and yarn A2, hang a load of 0.02 cm per denier on each yarn at 30Crtr, and read the length of each marking point from the bonding point. , calculate the thread difference using the following formula.

Thread length difference (%) - 100X ((Length of thread A2 per thread A1
Length)/Length of Yarn A1) The nylon bulky yarn (6) wound by shrinkage difference is taken out at 1 TrL and separated into yarn A1 and yarn A2, each having a denier of 0.
After hanging the end of the yarn with a load of 02 q, marking is done at a gap of 30 cttr in the middle area, and then the load is removed. The yarn was wrapped in gauze and immersed in boiling water for 30 minutes, then taken out and air-dried at room temperature for 8 hours.
Apply a load of 11g and read the length of the gap where the marking was made first, and find it using the following formula.

Shrinkage rate (%) = 100x ([length before treatment 30CII
I) - Length after treatment]/Length before treatment (30 cm)) Further, the shrinkage difference is calculated from the shrinkage rate of yarn A1 and the contraction rate of yarn A2 using the following formula.

Shrinkage difference - Shrinkage rate of yarn A2 - Shrinkage rate of yarn Δ1 In the bulky yarn of the present invention, the yarn foot difference must be 2% or more. 2%
If it is less than that, the slack taett will decrease and the fiber binding force within the fabric will increase, and the difference in shrinkage that has been imparted will not be fully expressed, resulting in bulkiness that is simply due to the difference in yarn length. On the other hand, if the yarn length difference is 15% or more, the surface of the fabric becomes rough and uneven, resembling a fabric using fancy yarn, which is not preferable. Therefore, this yarn foot difference is preferably 4 to 10%, and from this point of view it is preferable to set the heating plate temperature to 150° C. or higher. Next, the shrinkage difference is required to be 2% or more, and if it is less than 2%, even if the shrinkage difference has an effect, the contribution of bulkiness is insufficient. On the other hand, if the shrinkage difference is 15% or more, shrinkage spots are likely to occur on the surface of the fabric. This is because the difference in shrinkage between areas that have been sufficiently heat treated during the dyeing and finishing process and areas that have not, causes moiré-like defects on the surface of the fabric. Therefore, this shrinkage difference is preferably 5 to 12%, and from this point of view as well, the temperature of the heating plate is preferably 150°C or higher. Here yarn A1
The difference in shrinkage between the yarn A2 and the yarn A2 can be adjusted by heating the supply roller (1) and adjusting the shrinkage rate of the yarn A2.

The process shown in Fig. 2 has almost the same structure as that shown in Fig. 1, but the drawing roller (2) is changed to a drawing roller ('71) and a new air nozzle (8) is used to properly entangle the entangled bulk. This process is suitable for obtaining yarn.

When using a so-called interlace nozzle having air injection holes perpendicular to the yarn guide hole as the air nozzle (8), the diameter of the small diameter part of the stepped roller (8) is 0 compared to the large diameter part. A stable confounding effect can be obtained by reducing the amount by about .5 to 3%. The air pressure at that time is 1.09/d
~3 to 9/cd is sufficient. If the number of intertwined parts (tightened parts) increases too much, the number of loose fibers will decrease, so the number of intertwined parts should be about 30 to 100 per meter. Furthermore, in addition to the interlaced nozzle, a taslan nozzle or the like can be used to further increase the bulkiness. In that case, use a stretching stepped roller (enlarge the diameter ratio of the sword's large and small diameters,
By controlling the amount of yarn supplied to 4 to 25%, it is possible to obtain a nylon having high bulkiness in which loops, slacks, and intertwined portions are mixed. However, when the amount of yarn supplied is less than 4%, the bulkiness is not much different from that when using an interlaced nozzle, and when it exceeds 25%, there are many loops, making the fabric surface rough and causing a zipper phenomenon. Therefore, it is preferably 10 to 20%. At that time, a high air pressure of 6 h/cd to 9 Kg/cd is used.

However, when threading a normal Taslan nozzle, it is necessary to stop the drawing machine, insert the yarn end into the yarn guide hole of the Taslan nozzle, and take it out from the exit side of the nozzle. I couldn't thread it. This means that if a yarn breakage occurs during stretching, it is necessary to stop the weight or stop the entire system to hang the yarn, leading to a significant decrease in productivity, which does not necessarily meet the purpose of the present invention. There is also. In order to avoid a decrease in productivity due to this nozzle, it is necessary to provide bulkiness using a special nozzle as shown in FIG. 4 (ω, <b). This special nozzle has a slit (t) that runs parallel to the thread guide hole (9).
), the thread can be guided to the thread guide hole (9), and threading can be carried out without stopping the drawing machine. In addition, there is a pair of air injection holes 01) with respect to the thread guide hole (9), but the angle of these air injection holes 01 is 90 degrees when viewed from the top (J). (This is referred to as “
As shown in the "three-dimensional") and plan view), the exit side of the thread guide hole (9) has a tapered structure that widens, so that the thread can smoothly flow toward the exit side. In the case of this special nozzle, as with the previous Taslan nozzle, the yarn supply amount is set to 4 to 25%, thereby creating loops and slack.

It is possible to obtain a bulky nylon yarn with a mixture of interlaced parts.

Example-1 Two undrawn nylon yarns of 90d/36f were prepared, and the first
In the process shown in the figure, the supply roller (1) 267m/
speed of the stretching roller (2+800m/1n speed.

The temperature of the heating plate (3) was set to 200°C, and the undrawn 90d/36f nylon yarn A+ was spliced to the heating plate (3), and the undrawn nylon yarn 90d/3
The 6f yarn A2 was passed through the guide (4) and both were stretched at a stretching ratio of 3.0 times, and then wound up with the winder (5) to obtain a nylon bulky yarn (6). The obtained nylon bulky yarn (6) has a diameter of 60d/72f, a shrinkage difference of 8%, and a yarn foot difference of 7.
%, it was a bulky yarn with a lot of sag and miscellaneousness. The obtained bulky yarn was twisted at 500T/M to give a warp density of 100.
Book / 2.54 cts, weft density 80 / 2,54
A good finished fabric was obtained by weaving the crtr plain weave fabric and subjecting it to a normal dyeing and finishing process. The fabric had sufficient expression due to differential shrinkage, and was rich in bulky, soft feel and span.

Example-2 Nylon undrawn yarn 90d/12f (A+) and nylon undrawn yarn 90d/72f (A2) were prepared, and in the process shown in FIG.
The speed of the large diameter part of the stretching stepped roller (8) is 800 m/1n, the temperature of the heating plate is 1
Set at 50°C, the nylon undrawn yarn 90d/12f
(A+) was attached to the heating plate, and the other undrawn nylon yarn 90d/721 (A2> was attached to the guide (4), and after both were stretched at a stretching ratio of 3.0 times, the stretched stepped roller ( Using a special nozzle (Fig. 4) installed near 7), the air pressure at that time was 8 Kg / ct.
d. With the excess supply system amount set at 12%, the stretched yarn is introduced into the nozzle through the slit portion of the special nozzle (8), subjected to air bulking, and then wound up with the winder (6). Ta. The obtained nylon bulky yarn has a size of 66d/84f, with a shrinkage difference of 5% and a yarn length difference of 3%, but the nylon bulky yarn has a mixture of loops, slack, and intertwined parts due to the bulking effect of the special nozzle (8). Met. Using this bulky yarn, the warp density is 98/2.54 am and the weft density is 78/2.54 am.
When weaving a CRTR plain weave and applying the usual dyeing finish, the difference in shrinkage was sufficiently expressed, and the fiber voids in the fabric were large, giving it a soft feel and bulkiness, and the fabric surface was covered with fluff, giving it an elegant appearance. A fabric with a spunwriter texture was obtained.

<Effects of the Invention> According to the present invention, not only a difference in shrinkage but also a difference in yarn length is simultaneously applied under the drawing speed, and the synergistic effect of these allows the difference in shrinkage to be sufficiently expressed, and the bulkiness due to the difference in yarn foot can be reduced. It is possible to obtain a nylon bulky yarn that can be made even higher. In addition, this bulky yarn is not easily affected by weaving density, and can significantly reduce the occurrence of defective products when dyeing and finishing fabrics.

Furthermore, such a fabric is particularly effective in high-density woven and knitted fabrics for waterproofing and moisture permeability, such as windbreakers.

[Brief explanation of the drawing]

Figure 1 is a route diagram of the process of the present invention, Figure 2 is a route diagram of the process showing another aspect of the present invention, and Figure 3 explains the relationship between the shrinkage difference, yarn foot difference, and the temperature of the heating plate. The graph in FIG. 4 is a route map of the special nozzle used in the present invention. A+, A2... Nylon undrawn yarn 1... Supply roller 2... Stretching roller 3... Heating plate 4... System guide 5... Winder 6... Nylon bulky yarn 7 ...Stretching stepped roller 8...Interlace nozzle or special nozzle a...
・Special nozzle plan view b...Special nozzle front view 9...Thread guide hole 10...Slit 11...Air injection hole 12...Exit side of thread guide hole) P11Σ De21Σ Patent applicant Tei Person Stock Membership Representative Person Patent Attorney Former 1) Junsha・(Daanryoku O Roppo・) 0 Rate Kirishizuku・Otsu

Claims (2)

[Claims] (1) When drawing two undrawn nylon yarns in a drawing area that shares a heating supply roller and a drawing roller, one undrawn yarn is subjected to drawing heat setting, and the other undrawn yarn is heat set. 1. A method for producing a nylon bulky yarn, which comprises stretching both yarns at the same stretching ratio to provide a boiling water shrinkage difference of 2% or more and a yarn foot difference of 2% or more between the two. (2) When drawing two undrawn nylon yarns in a drawing area that shares a heating supply roller and a drawing roller, one undrawn yarn is subjected to drawing heat setting, and the other undrawn yarn is heat set. After stretching both at the same stretching ratio and giving a boiling water shrinkage difference of 2% or more and a yarn foot difference of 2% or more between them, the following air nozzle was further applied under 2 to 4% overfeed. 1. A method for producing bulky nylon yarn, which comprises introducing a nylon bulky yarn into the yarn to impart loops, slack, and entanglement to the yarn. ￥Air nozzle￥ A slit part that is parallel to and penetrates the thread guide hole is provided, and the angle of the three-dimensional air injection hole is symmetrical to this slit part at 90 degrees, and the exit side of the thread guide hole is widened in a tapered shape. Air nozzle with thread passage hole.