JPH02269829A - Polyester textured yarn of sheath-core structure - Google Patents

Abstract

PURPOSE:To obtain the title textured yarn containing filament which can form free ends after caustic thinning treatment and form a variety of space by arranging a multifilament yarn of maximum filament fineness as the core and satisfying specific conditions. CONSTITUTION:The subject textured yarn contains multifilaments of the maximum filament denier as the core, satisfies equations I through III (Di: total denier of the multifilaments of the maximum filament denier, fi: the filament count of the multifilaments, Do: total denier of the filaments other than the multifilaments in the core, fo: the filament count) wherein at least a part of filaments other than core multifilaments have uneven thickness in the lengthwise direction and mix and interlace with one another in the textured yarn.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a processed polyester yarn with a core-sheath structure. It concerns yarns with fibers that form free ends after so-called alkaline loss.

[Conventional technology]

Conventionally, synthetic fiber fabrics have been modeled after natural aUam products, and various improvements and improvements have been made in various areas such as texture, appearance, and touch. Polyester false twisted yarn is no exception. For example, starting from a simple crimped yarn, there is a two-layer textured yarn with a difference in yarn length between the side yarn and the core yarn as an improved product. This is an attempt to diversify the space by adding a new yarn length difference space, whereas normal false twisted yarn only has a constriction space.

[Problem to be solved by the invention]

However, these efforts are often not sufficient. In particular, most of these methods focus on one factor of natural fiber threads, and ignore or neglect the overall basic characteristics of textiles.

The general property of structural yarn is to seek softness and fullness by diversifying the space, and although these are on the way to being satisfied, if we are too fixated on this, we are not focusing on the basic characteristics of textiles. It has lost its elasticity, firmness, resilience, and various factors that lead to the tailoring, movement, and sensibility of the fabric.

In addition, natural fibers have not only crimped and yarn length difference spaces, but also fluff spaces, and these space forms are various and extremely diverse. The present invention not only eliminates the drawbacks of conventional yarns, but also attempts to achieve a good balance between the acquisition of dense space and the basic physical properties of a textile.

[Means to solve the problem]

That is, the present invention is a polyester core-sheath structured processed yarn consisting of two or more types of polyvarnish/chill multifilaments with different single fiber finenesses, and the multifilament with the largest single fiber fineness is arranged in the core. , the following formula (1) ~
At least some of the filaments other than the multifilament, which satisfies both of (3) and has the largest single fiber fineness arranged in the core, have uneven thickness in the length direction, and furthermore, the polyester There is a polyester core-sheath structured processed yarn which is characterized in that the constituent filaments are mixed and intertwined to form intertwined parts within the core-sheathed processed yarn.

5≦Dl/f1≦12 (1) 2 (
Doxf i) (Dixfo (30(Doxf i)
) = (2) 0.2 (Do/Di (1,5...
...(3) However, Dl is the total fineness (denier) of the multifilament with the largest single fiber fineness constituting the core, and fi is the total number of filaments (
DO means the total fineness (denier) of all filaments other than the same multifilament, and fo means the number of scratches (number) of all other filaments except the multifilament.

First, the polyester core-sheath structured textured yarn of the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic diagram showing a side view of the polyester core-sheath structured processed yarn of the present invention, and in the figure, 1 is a core yarn and 2 is a side yarn.

The side threads have a longer length (difference in thread length) than the core threads and are located more in the outer layer.

The single fibers constituting the side threads have uneven thickness in the length direction, and the uneven thickness exists randomly. The core yarn is made up of the thickest fibers. The constituent filaments are mixed and intertwined in the length direction of the thread to form an intertwined portion. More specifically, it has fewer side yarn components than conventional structured yarns, and after caustic reduction, free end fibers, so-called fluff spaces of natural fibers, are formed. A detailed explanation of each is as follows.

First, the characteristics of space will be explained. The morphological features of the present invention are:
In contrast to conventional structural yarns, which are simply crimped and have yarn length differences, they actively contain fibers such as loops and curls. Another purpose is to retain free end fibers (fluff fibers) after caustic weight reduction. This is often obtained from the thick portions of the fibers that make up the side yarns and has uneven thickness, and is present in large amounts in the outer layer of the yarn, resulting in a significant texture effect. Thick parts are those where the molecular orientation has not progressed, and are brittle and have a high rate of caustic weight loss.Although this varies depending on the yarn manufacturing conditions, in the fabric using the processed yarn of the present invention, the weight loss rate is already high. Free end fibers are often generated with considerable frequency. The diversity of these spaces gives the fabric of the present invention its softness and fluffiness as well as the roundness that natural fibers have.

Next, we will discuss the elasticity, stiffness, resilience, etc. of textiles, which conventional structured yarns have been unable to achieve or have ignored. The main cause of these problems is the yarn structure itself.While conventional structured yarns can provide softness and fullness due to the difference in yarn length, they inevitably lose basic textile properties such as elasticity, firmness, and resilience. There is. The present invention does not simply follow the concept of conventional structural threads, but aims to retain the basic characteristics of textiles in a well-balanced manner as well as the formation of space, that is, to not follow the basics and original concept of textiles.

First, we will discuss the elongation (drawability) of textiles. The elasticity of textiles is an important factor not only in sewing, but also in terms of tailoring quality and comfort. In order for a woven fabric to have elasticity, it is essential that it shrink well in form (excluding fiber shrinkage) during the finishing process, especially the relaxing (hot water treatment) process. However, it is brought about as a phenomenon in actual textiles, and cannot be judged simply based on physical properties. In other words, in actual textiles, the warp and weft intertwine, creating a restricted space and constraining force. In other words, it is important not to introduce fibers with poor ability to shrink into a restricted space as much as possible, and to have the ability to overcome the constraining force. Conventional two-layer yarns have extremely low crimp modulus (the rate at which crimp shrinks when subjected to hot water treatment). To give an example of a numerical value, while a normal textured yarn has a thickness of around 55%, a conventional two-layer structure yarn has a thickness of about 7 to 15%.

In addition, the side threads have a difference in thread length and are already in a shrunken state, and the amount (amount ratio of side thread/core thread) is 1.5 to 2.
．． 0, which is a large number. In other words, a large amount of components that do not have the ability to shrink fill the space, which causes a negative effect when trying to shrink. Furthermore, when the core yarn tries to shrink, the force is small due to the ratio of side yarns to core yarn, which is disadvantageous in order to overcome the restraining force of the fabric. Of course, regular textured yarn is better than structured yarn when it comes to shrinkage. The present invention achieved the following conclusions as a result of intensive efforts to impart stretchability to the fabric (as a structural yarn) without losing the softness and fullness of the fabric while meeting these requirements. That is, to explain the case of a structured yarn made of two types of polyester multifilament yarns as an example, a thick fiber is used for the core yarn and a fine fiber is used for the side yarn. When the total fineness and number of filaments are respectively %Di, fi, Do, and fo, 5≦Di/fi≦12 (1
)2(Doxfi)((Dix!o)<30 (Dox
fi ) = (2) 0.2 (Do/Di (1,5・
...The thread structure of (3) is good.

The details are as follows. In order to obtain elasticity, it is preferable to reduce the ratio of side threads, but there is no temporary increase due to the burden of the side thread components and the binding force of the fabric.
Absolute force is also required.As the 0 side yarn amount ratio increases, the core yarn needs to be thicker (single fiber), and even if the side yarn amount ratio decreases, the fineness is higher than μ to some extent is necessary, or especially when the side yarn amount ratio is large, the open group occupation of the woven tissue space becomes high, which is undesirable.Preferably, in the above formula +3), 0.2 (Do/Di < 1.2) Space occupancy is also related to the number of filaments in the side yarn and the number of filaments in the core yarn; a large number of filaments in the side yarn is unfavorable, and a small number of filaments in the core yarn provides a place for shrinkage of the core yarn fibers. At the same time, the influence of other fibers will be reduced.It is not preferable to select these factors alone, but they must be considered in consideration of hand, touch, other characteristics, manufacturing constraints and balance. For example, if the amount of side yarns is extremely small, the softness and fullness will be lost, and the yarn will have a thick texture.If the number of thick fibers is too small, the side yarn core yarn will separate and lose its practicality.

Furthermore, if the single fiber fineness of the core yarn becomes too high, the softness will be lost, and the entanglement between the core yarn and the side yarns will also be insufficient, making it impossible to obtain a structured yarn.

Next, I will explain b and repulsion of the lower back. It is well known that structural yarns are generally inferior in stiffness and resilience compared to processed yarns. The main reason for this is the structure itself, as well as the elasticity mentioned above. In other words, the side threads are already in a loose state due to the difference in thread length, and because they are in the fabric, they have little strength to resist bending deformations such as waist stiffness, and have a degree of freedom against bending deformations. It even has the property 'R' (property that does not require recovery or repulsion) that it can respond to a shape change that changes by 1 to the extent that it deforms as fiber strain. One possible way to improve this is to temporarily reduce the side yarn amount ratio, but this is not simple because in actual woven fabrics, a restraining force is exerted as shown earlier, and the burden effect of the side yarns is taken into consideration. Particularly in terms of repulsion, the effect is small. As a result of careful consideration of this point, the authors of this study found that in this case as well, overall force is required as in the case of elasticity, and that it is preferable to use thick IJt IJj for the core thread, and the amount of side threads should be It was found that a certain amount of force is necessary even if the ratio becomes small. Similar results were obtained regarding the texture, number of filaments, and ratio of filaments between side threads and core threads.

In addition, the yarn length difference between the core yarn and side yarn in the present invention is 1 and 2 to 3.
0chi is preferable. The smaller the difference in yarn length, the less softness and plumpness, but the easier it is to obtain elasticity, firmness, and resilience. In addition, it is preferable to have a yarn length difference of more than a certain level where the ratio of side yarns/core yarns is small, so that the sacrificial properties described above can be obtained without losing softness and fullness.

Further, in the present invention, improvements such as adding a component having a small single fiber fineness to the core yarn or adding an intermediate layer can be added. Furthermore, the side threads may be composed of two types of filament threads. However, in these cases as well, the formulas (1) to (
3) It is important to satisfy the formula.

Next, the method for manufacturing the yarn of the present invention will be described. FIG. 2 is a Chinese-style diagram showing the manufacturing apparatus, and in the figure, numerals 3 and 4 indicate supply yarns for side yarns and core yarns, respectively. &, R1 are respective supply rollers, N is a disturbance fluid nozzle, G is a guide, Rz is an intermediate roller, H is a heater, S is a false twisting unit), Rs is a delivery roller, and Tu is a winding machine. In order to obtain the yarn of the present invention, both the core yarn and the side yarn are undrawn yarns, and the false twisting is a drawing simultaneous false twisting including stretching, and more preferably, the side yarn is the core yarn. It is important to avoid oversupply. The details are as follows.

The side threads are supplied in excess compared to the core threads, so that each supply o - la Ro
, R1 leads to the disturbance fluid nozzle N, and the yarn is mixed and entangled and has protrusions such as loops and curls on the yarn surface. Protrusions such as loops and curls, or fibers floating on the surface, mainly originate from the side threads. Next, guide G
1 intermediate roller R2, heater H, false twisting unit S1 and delivery roller R3, and is wound up by winding machine Tu. At this time, drawing and simultaneous false twisting is performed to obtain a yarn as shown in FIG. The thicker portions of the uneven thickness represent loops and curls caused by the disturbed fluid treatment that remain unstretched even after stretching. This part may be insufficiently stretched,
This is the part that remains without being stretched, and is brittle and susceptible to caustic decomposition. Therefore, they tend to become free-end fibers when they are damaged during the textile weaving process or subjected to caustic decomposition. The frequency of the thick portion increases as the excess supply of side threads increases. Usually a 5-70% overfeed is used.

Further, by complicating the fibers by creating loops, curls, slack fibers, etc. prior to simultaneous drawing and false twisting, the spatial diversity of the resulting yarn can be significantly improved. The present invention can be obtained even if the side threads and the core thread have the same breaking elongation, but it is more effective if the breaking elongation of the side thread is set to the same value. Of course, it is important that the yarn obtained here satisfies the above formulas (1) to (3), and for this purpose it is necessary to select the side yarn and core yarn.

In addition, in the present invention, a component with a small single fiber fineness is added to the core yarn, and the side yarn is 2'! 11 filament threads, or K may include an intermediate component in addition to side threads and core threads. Even in such a case, the object of the present invention can be achieved as long as the above conditions are satisfied. (9) In the present invention, it is preferable to use irregular cross-section fibers as side threads in order to diversify the space.

In addition, the present invention is made of polyester fiber, and
The polyester used in the present invention means polyethylene terephthalate or a copolyester mainly composed of ethylene terephthalate units.

Next, details of the present invention will be specifically explained with reference to Examples and Comparative Examples. The apparatus shown in FIG. 2 was used for these experiments. The results are shown in Table 1. The obtained yarn was twisted at 250 T/M, and the 2/2 twill was finished with weaving, and the texture, elasticity (elongation), resilience, etc. of the fabric were examined.90Details are as follows. be.

Examples 1 to 3 With the combination of yarns shown in Table 1, each yarn was fed at a speed of Ro and R1 (m7 minutes) shown in Table 1, and the yarns were combined and agitated with an air pressure of P. Fluid treatment was performed and the fluid was supplied to the stretching and simultaneous false twisting section at a speed of R2 (m/l).The heating temperature at that time was H°C, the number of false twists was S (T0n),
The degree of edge stretching is determined by the speed Rs (m7 minutes) of the delivery roller. The resulting structured yarn was then rolled up.

The i-bond processed yarns obtained in Examples 1 to 3 had high elasticity and good stiffness and resilience. In addition, the side threads had uneven thickness in the length direction, which mainly consisted of curls, loops, and sagging. As a result of applying the above-mentioned weaving finishing process and caustic weight loss, there is a lot of freedom in the caustic range t9%! Rm was detected. It had a good bulge in texture and the presence of free end fibers, giving it a unique mellowness and roundness that cannot be described as single-V soft. In Example 2, the side threads were cationically dyed using undrawn yarn obtained by spinning 2.5 moles of cationic dye-dyeable 5IP (sodium sulfoisophthalate) copolymerized polytere/terephthalate and polyethylene terephthalate using the same spinneret. be.

It has excellent tangle properties, and the texture is particularly combed serge style.

Comparative Examples 1 to 3 Comparative Example 1 is a conventional two-layer textured yarn with elasticity, firmness,
It had poor repulsion and no free edge resistance. Although it is soft, it is soft and confusing.

In Comparative Example 2, the core yarn was composed of thick-cut fibers, but the shadow 4 of the side yarns was strong, and although there was some improvement in elasticity, stiffness, and resilience, it was not effective. In Comparative Example 3, the fibers separated and formed neps, probably due to the extremely excessive single fiber stiffness of the core yarn and the lack of filament ha as an intertwining partner.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the side surface of the yarn according to the present invention.
2 indicates the core thread, and 2 indicates the side thread. FIG. 2 is a schematic diagram showing the manufacturing apparatus. Patent applicant RiRa Shi Co., Ltd.

Claims (1)

[Claims] A processed yarn with a polyester core-sheath structure consisting of two or more types of polyester multifilaments with different single fiber fineness, in which the multifilament with the largest single fiber fineness is arranged in the core, and the following Both formulas (1) to (3) are satisfied,
In addition, at least some of the filaments other than the multifilament with the largest single fiber fineness arranged in the core have uneven thickness in the length direction, and furthermore, within the polyester core-sheath structured processed yarn, A processed polyester yarn with a core-sheath structure, characterized in that the constituent filaments are mixed and intertwined to form intertwined parts. 5≦Di/fi≦12 (1) 2 (D
oxfi)<Dixfo<30(Doxfi)...
...(2) 0.2<Do/Di<1.5...
...(3) However, Di is the total fineness (denier) of the multifilament with the largest single fiber fineness constituting the core, and fi is the total number of filaments of the multifilament (denier).
Do means the total fineness (denier) of all other filaments excluding the same multifilament, and fo means the total number (number) of all other filaments except the same multifilament.