JPH02154020A - Drawn yarn having small protrusion and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject drawn yarn having small protrusions in the direction of length and giving a bulky and milk touch by subjecting a drawn polyester multifilament yarn having modified cross-section to turbulent fluid treatment and hot-drawing treatment under specific condition. CONSTITUTION:A drawn multifilament yarn composed of polyester fibers having modified cross-section with >=3 lobes is subjected to turbulent fluid treatment at an excess feed ratio (K) of >=3% to impart the yarn with >=1 entanglement per 50mm and >=5 fiber protrusions per 25mm on an average in the direction of fiber length. The treated yarn is successively subjected to hot drawing treatment at a draw ratio satisfying the formula and a draw temperature of 70-240 deg.C to obtain the objective drawn multifilament yarn having small protrusions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a drawn polyester multifilament yarn and a method for producing the same. More specifically, it relates to a drawn yarn having fiber protrusions such as loops and curls on the surface of the yarn.

[Prior Art] Conventionally, polyester filaments have been made in a simple straight shape, and various improvements have been made to make the yarns fuller. One is the field of silk crimping, which uses straight filaments but with different yarn lengths, the second is the field of crimped yarns and structured yarns, which have crimped yarns and different lengths. This is a rather strong twist yarn field in which fiber protrusions such as loops and curls are provided on the yarn surface.

[Problems to be Solved by the Invention] Among these methods, various ideas have been proposed regarding the last method, but compared to the second method, it has remained largely undeveloped and commercialized. In particular, fine denier has not yet been commercialized.

Conventionally, drawn yarns having these fiber protrusions have been produced by subjecting multifilaments to a turbulent fluid treatment. However, it has been found that when such drawn yarns are put to practical use, they have various problems. One is the ability to rise. In other words, the L thread cannot be removed because it is wrapped in cheese or bread. This is due to the fastener effect in which the protruding fibers fit between the yarns and the large frictional resistance when rubbing against the surface of the wound yarn, resulting in yarn breakage.

Another problem is that conventional protrusion-forming yarns have a strong tendency for protrusions to disappear when tension is applied.

These two synergistically cause the riseability to be further reduced.

That is, when the material is wound more softly in an attempt to reduce the loss of the protrusion, a -layer fastener effect is produced. In order to eliminate these drawbacks, it is sufficient to make the protruding portion small, and this will result in excellent unwinding properties. Various such efforts are being made. For example, attempts have been made to develop a turbulent fluid nozzle to obtain a small protrusion, or to use high-shrinkage threads that are then subjected to heat shrinkage to reduce the protrusion. However, none of these can be said to be sufficient, and even to this day.

[Means for Solving the Problems] That is, the present invention consists of polyester fibers with irregular cross sections of three or more leaves, and the surface of the fibers is made of polyester fibers with irregular cross sections. In the polyester drawn multifilament yarn having a protruding part, at least a part of the protruding part forms a tangle with other fibers at the root part,
The protrusion coefficient (protrusion height/protrusion width) of the protrusion is 0.
5 or more and whose height is 1.73 or more of the yarn diameter, there are 3 or more protrusions per 251 m of yarn length, and on average there is one entanglement per 50 mm or less of yarn length. A drawn multifilament, which is a drawn yarn characterized by having an elongation of 6% or less under a load of 1.5 g/d of the yarn length, and is made of a polyester fiber with an irregular cross section of 3 or more leaves. When subjecting yarn to turbulent fluid treatment,
The excess feeding rate was set to 23%, and an average length of entanglement of 150 mm or more per thread and a fiber protrusion of 25 mm or more were given to the yarn in the longitudinal direction. After processing, 1+0.7(K/+00)≦
This is a method for producing a drawn multifilament yarn having small protrusions, characterized in that DR≦1 + [(K + 10)/+00] and the elongation temperature is 70 to 240°C.

The first is a schematic diagram showing a side view of a drawn yarn having small protrusions of the present invention. In the figure, h indicates the height of the protrusion (hereinafter referred to as the protrusion height), and e indicates the width of the protrusion (hereinafter referred to as the protrusion middle). The main characteristics of the yarn of the present invention are that fibers with irregular cross sections of three or more leaves are used, that the protrusions have various shapes and sizes without being tall, and that they have mixed fiber entanglements in the length direction. It is that you are. Next, the details will be explained.

First, the present invention will be explained from the fact that, unlike conventional threads, the present invention has a sufficient holding force for the protruding portions for practical use. The yarn of the present invention is originally composed of a single yarn, and has the property that when protrusions such as loops and curls are unraveled, each filament becomes the same length. Nevertheless, in order to maintain the protrusion and local yarn length differences, it is important that the fibers do not shift from each other, and a stop point or stop portion is required. Furthermore, it is important that the stopping power is large. In the present invention, these stoppers are mixed fiber entanglements, particularly mixed fiber entanglements formed at the base of the protrusion. (hereinafter referred to as root entanglement). In the present invention, it is important that at least a portion of the protrusion has a root entanglement. The disappearance of the protrusions is a sign that the strength of the entanglement is weak, and the cross section of the fiber is immersed in three or more leaves (three or more protrusions in the cross section), especially the three-lobed cross section. In addition, it is important for practical performance to configure the yarn using only yarns with high entanglement strength or more yarns with high entanglement strength.

In other words, the stability of the yarn form and the stability of quality are the reasons why it is an industrial product. To increase the entanglement strength, the overfeed rate and fluid pressure for fluid treatment are important. In the present invention, it is important that the elongation is 6% or less under a load of at least 1.5 g/d, although this differs somewhat depending on whether the fiber itself is easily elongated or difficult to elongate. In addition, the root entanglement is
It is not necessary to have it in all the protrusions, and it may be included in some of the protrusions.

It is sufficient that the mixed fiber entanglement, including the root entanglement, does not cause the protrusion to disappear. In the present invention, these connections are generally K≧
One or more units per cm are used. These factors are related to the stability of the yarn form as well as the number of protrusions produced, and it is particularly preferable that there be many entanglements at the roots.

Next, the shape of the protrusion will be described. The shape of the protrusion has the most influence on the feel of the fabric, and on the other hand, the handleability of the yarn, especially the riseability throughout the fabric preparation process. First, I will discuss the phenomena related to texture. A preferred condition for texture is relatively short protrusions, ie small protrusions, in which the shapes and sizes vary. This brings about a naturalness that adds firmness to the deformed space and roundness to the texture.

In addition, the protrusion that has a substantial effect is the roughness of the shape, and as shown in Figure 1, the value of (protrusion height) / (protrusion width),
In other words, the protrusion coefficient (r) is large. There is a large local yarn length difference, and such protrusions, even if small, have a large effect. For example, in the case of twisted yarn, even if the height is relatively large, if the width of the protrusion is large, the shape will disappear due to the twisted yarn. Moreover, the width of the protrusion is large, and the uniformity is small compared to the local yarn length difference.

Specifically, the wide protrusions span multiple structures on the fabric (between warp and warp, between weft and weft), and the irregularities between each structure are small and substantial. The height within the organization is small. In the present invention, in addition to having protrusions of various shapes and sizes, there are also many sharp and relatively large protrusions.

Specifically, the protrusion coefficient r≧0.5 and the height of the protrusion is 1/3 or more of the yarn diameter, and the protrusion has a protrusion coefficient of 3 or more n. When the protruding part coefficient, the protruding part height, and the number of protruding parts all satisfy these conditions, the texture of the fabric and the handleability of the yarn will be good. Note that it is not necessary for the protruding portion to be high, and it is preferable that at least 80% of the protruding portion be 3 times or less the diameter of the yarn.

Next, the handling of the protruding fibers and threads will be explained.

Particularly problematic points in handling are entanglement between yarns in various hobbin windings and strongly twisted yarns. In either case, it is advantageous that the height of the protrusion is small. For example, the zipper effect is small, and the frictional resistance when rubbing against the cheese or paan surface is small. Another problem is entanglement between yarns during strong twisting, for example during Italian yarn drawing. As for the shape of the protrusion, it is best to have a short protrusion that forms a tangle at the base, and the wider the protrusion, the more likely it is to get entangled. In general, the more soyab the shape, the more the roots are entwined, and the more "dron" the more the roots are not entangled. The present invention is characterized by having a sharp shape with many entanglements at the base, and the entanglement at the base is strong. Also, the more entanglements the yarn has as a whole, the better.

Note that the yarn structure of the present invention is not limited to one made of a single type of fiber, but may be made of multiple types of fibers having mechanical properties, visual properties, etc.

For example, fibers made of polyethylene terephthalate and fibers made of isophthalic acid copolymerized polyethylene terephthalate may be used. In these cases, there is a difference in thermal shrinkage between the two, and the latter shrinks more frequently during the textile finishing process, resulting in a difference in yarn length. This yarn length difference space works in conjunction with the loop space described above to give the fabric various bulges.

Next, the manufacturing method of the present invention will be described. FIG. 2 is a schematic diagram showing the yarn manufacturing apparatus of the present invention. In the figure, Fl is a drawn polyester yarn, Ro is a supply roller, N is a stirring fluid nozzle, HR is a heating roller, H is a heater, R1 is a delivery roller, TLI is a winding machine, and G is a guide. The polyester drawn yarn is supplied in excess from a supply roller and guided to a disturbance fluid nozzle, a guide, and a heating roller. At this time, protrusions such as loops and curls are formed on the yarn surface, and entanglements such as mixed fiber entanglement and root entanglement are imparted. The shape or number of the protrusions, the degree of entanglement, and the strength of the entanglement are mainly influenced by the surface condition of the drawn yarn used, the conditions of the disturbed fluid, and the like. In the present invention, the shape of the protrusion is preferably small, dense, and sharp, and it is desirable that the root entanglement and mixed fiber entanglement be strong and large in number. Fibers with a modified cross section, in particular three or more lobes, are suitable for this purpose. Round cross-section fibers lack the ability to form protrusions, and tend to produce rough and "drown" protrusions, which tend to come off and disappear when force is applied. A disturbance fluid nozzle with a high loop-forming ability and a high entanglement strength is suitable, and a specific example is a disturbance fluid nozzle that hits the yarn with high-pressure fluid from two to three directions, such as Hemanoet #310 ( Heparin, Inc.) is suitable. As for the disturbance treatment conditions, the greater the oversupply, the more dense and sharp protrusions, the higher the entanglement frequency, and the greater the entanglement strength. However, if it is extremely excessive, the yarn strength will be lost and the loop height will become large, which is not preferable. In the present invention, the excess supply rate is generally 2% to 100%. However, K is given by the following formula.

Also, the higher the air pressure to the agitated fluid nozzle, the better, so that a dense and dense protrusion can be obtained. Specifically, 4kg/
am' or more is preferable. If water is applied to the yarn before the agitating fluid nozzle, an even denser and noier protrusion can be obtained. The entanglement strength and air space are large. By this turbulent fluid treatment, an average of 150 Il +
Form n or more entanglements and 5/2511IIIT1 or more protrusions. If the number of entanglements and the protrusions are out of this range, the protrusions may disappear during the subsequent heat elongation treatment, or even if they exist, the texture will not be improved.

Next, the yarn is guided by the heating roller to a heater and then to a delivery roller, where it is heated and elongated. The purpose of heating and stretching is
The aim is to bring out the short, noyap-shaped protrusion without damaging the thread entanglement, and to adjust the physical properties of the thread. A heated roller or heater is what makes this effective. Of course, it is possible to elongate without a heating roller or heater, but in that case, the entangled protrusions will unravel and become a "clunky" protrusion. It will eventually disappear. When heated and stretched, a portion of the material tends to unravel, but a short, sharply shaped protrusion is obtained, and the entanglement becomes stronger. Originally, the protrusions obtained by processing disturbed fluids ranged from those with strong entanglements to those with weak entanglements.
It's tall and very bulky. In addition, the thread easily stretches through the protrusion. When this is heated and stretched, the fibers are warmed and become soft, so that the strength of the entanglement is increased in some areas, making it possible to reduce the size of the protrusion. In other words, it is like pulling a tangled thread, making it tight and difficult to unravel. This tendency becomes stronger as the heating temperature becomes higher. In extreme cases, it causes stress concentration and becomes weak. In the present invention, the heating roller is generally used at a temperature of 70°C to 200°C, and the plate-shaped heater is used at a temperature of 7Q'C to 240°C. Heating is used to assist in creating protrusions or improving entanglement, or to fix them. Further, both the heating roller and the heating heater may be present, or only one may be present.

Next, the expansion magnification will be described. As mentioned above, the purpose of elongation is to create a pool for producing protrusions and to create a tight yarn, that is, a yarn with a short elongation that does not lose the protrusions during handling. The extension ratio (DR) is related to the above fluid treatment, especially the excess supply rate K, and in the present invention, 1+ 0.7(K/1oo)≦DR≦1+ [(K
+10)/1ool (1) is used. If the elongation magnification is small, the protrusions will not be small, and the protrusions will disappear in subsequent steps. If it is too large, it will become too small or disappear. FIG. 3 is an example of a pond in a manufacturing device. Since one more heating roller 1Rt) is provided between the heater of the apparatus shown in FIG. 2 and the delivery, it is possible to perform heat expansion, heat fixation, or contraction heat fixation in two stages. Thereby, a drawn yarn having finer and stronger protrusions can be obtained. The heating temperature at that time is 80
Can be used at temperatures above ℃. Note that it is important that the elongation magnification satisfies equation (1) both partially and in total during the path from the first heating roller (HR, ) to the delivery roller.

The fineness of the fibers constituting the drawn yarn of the present invention is from 0.3 to
4.0 denier, particularly 0.5 to 2.0 denier is preferable, and the total denier of the yarn is preferably 200 denier or less.

In addition, in the present invention, in addition to a combination of two or more types of fibers with different heat shrinkage rates as described above, fibers with different finenesses, different cross-sectional shapes, etc. may be used. Any material that can be regarded as substantially one thread may be used.

The polymer constituting the drawn yarn of the present invention is a copolyester mainly composed of polyethylene terephthalate or ethyleneterephthalate units.

Note that the protruding portion referred to in the present invention, its height, width, and thread diameter are as follows:
This can be easily done by viewing the thread while rotating it under tension using a magnifying projector without touching the thread. Entanglement is also measured using the usual method of floating the yarn on the water surface and observing the yarn spread. The elongation of the yarn is measured in a conventional manner, ie, by measuring elongation under load using an Instron.

Further, details of the present invention will be specifically explained using Examples and Comparative Examples. Since Table 1 summarizes these results, the manufacturing equipment shown in Figures 2 and 3 was used in the implementation. As the polymer, polyethylene terephthalate was used in all cases except for Example-3.

Examples Using the drawn polyester yarns shown in Table 1, a disturbed fluid treatment and a heat elongation treatment were performed under the conditions shown in Table 1 to obtain various drawn yarns having protrusions on the surface.

The performance of the obtained yarn is shown in Table 1, and each will be explained in detail below.

Comparative Example 1 A conventional drawn yarn having protrusions was treated with a disturbed fluid (Taslan processing) and wound up. It had many tall protrusions and was bulky. The yarn had a high elongation under a weight of 1.5 g/d and the protrusions disappeared.

Bobbin winding (winding from the pirn to the bobbin) was carried out as a pre-process to check the Italian twistability, but the yarn did not stand up and was broken.

Example-1 After treatment with disturbed fluid, heating and elongation were performed.

Very thin protrusion (the height of the protrusion is less than 3 times the yarn diameter is 9)
A bundled yarn was obtained in which the fibers accounted for more than 5% of the fibers. The yarn had both tangles, mixed fiber tangles, and tangles at the roots of protrusions, and the protrusions did not disappear and were difficult to stretch (3.7% under a load of 1.5 g/d). The twistability of the yarn was examined and it was found to pass through the process smoothly. Furthermore, we investigated the texture and touch of a highly twisted yarn fabric (Georgette 1ass-ZZ).
The protrusions on the surface give it a mellow and natural texture and touch.

Comparative Example 2 A conventional drawn yarn having protrusions was stretched at room temperature. The protrusion disappeared significantly, and no sharp protrusion was obtained. Most of the tangles generated during the disturbed fluid treatment had dissolved and turned into large "drones". When we examined the twistability of the yarn, we found that the twisted yarn entangled the adjacent yarns and became entangled (entangled with separated fibers).

Comparative Example 3 This was the same as Example 1, but it was a bulky yarn with a small heating elongation ratio and remaining tall protrusions generated by the agitated fluid, and bobbin winding and Italian twistability were not possible.

Comparative Example-4 Same as Example-1, but round cross-section fibers were used. The protrusions that are generated during the processing of disturbed fluids have a large, closed shape and are weakly intertwined. The heat and elongation treatment removed most of the removal, leaving only a very wide, dull protrusion. There was significant entanglement in the twisted yarn.

Comparative Example-5 Same as Example-1, but the excessive supply rate of the disturbed fluid treatment was small, the protrusion was poor, and after heating and elongation, the yarn became straight like a drawn yarn.

Comparative Example-6 This is the same as Example-1, but the heat elongation was excessive. The protrusion disappeared and it became straight.

Example 2 This is an example in which heat elongation was performed in two stages. A yarn was obtained which had thinner protrusions than in Example 1 and had more entanglements at the roots of the protrusions. A smooth fabric with good texture and touch was obtained using the twisted yarn.

Example-3 Same as Example-2, except that (PET/C0P) was added to the drawn yarn.
E5) Same-spun drawn yarn was used. It had thin protrusions on the surface and was smooth when twisted.

It was made into a plain woven fabric by applying medium twist with a twist number of 1,800T/M.

(PET/C0PE5) caused a difference in shrinkage, which combined with the protrusions on the surface to give a bulging, mellow touch.

Margin below

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a side view of the drawn yarn of the present invention. FIG. 2 is a schematic diagram showing the yarn manufacturing apparatus of the present invention. FIG. 3 is a schematic diagram of an example of a pond in the yarn manufacturing apparatus of the present invention. Patent applicant RiRa Shi Co., Ltd.

Claims (1)

[Claims] Consisting of polyester fibers with irregular cross sections of one or three or more leaves,
In a polyester drawn multifilament yarn having fiber protrusions on the surface, at least a portion of the protrusions form entanglements with other fibers at the root, and the protrusion coefficient (protrusion height/ A protrusion whose width (protrusion width) is 0.5 or more and whose height is 1/3 or more of the yarn diameter is defined as yarn length 25.
There are 3 or more entanglements per mm, and on average there is one entanglement per thread length of 50 mm or less, and the elongation under a load of 1.5 g/d is 6% or less of the thread length. A drawn yarn characterized by: 2. The drawn yarn according to claim 1, in which 85% or more of the protrusions are three times or less the diameter of the yarn. 3. The drawn yarn according to claim 1, wherein the drawn yarn is composed of two or more types of fibers having different physical properties. 4. When applying a disturbed fluid treatment to a drawn multifilament yarn made of polyester fibers with irregular cross sections of 3 or more leaves,
Excess supply rate K≧3% is applied to give an average of 1 piece/50 mm or more of entanglement and 5 pieces/25 mm or more of fiber protrusions in the yarn length direction, followed by heat elongation treatment at the following elongation ratio DR. 1+0.7(K/100)≦DR≦1+[
(K+10)/100] and the elongation temperature is 70-240℃
A method for producing a drawn multifilament yarn having small protrusions, the method comprising: 5. A method for producing a drawn yarn according to claim 4, characterized in that the heating and stretching treatment is performed in multiple stages such that the total stretching ratio DR satisfies the formula set forth in claim 4. 6. A method for producing a drawn yarn, which comprises subjecting the method according to claim 4 to constant length or shrinkage heat treatment at 80° C. or higher. 7. The method for producing a drawn yarn having protrusions according to claim 4, wherein the yarn used is composed of a plurality of fibers having different physical properties.