JPS62177248A - Coated elastic yarn and its production - 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 Field of Application] The present invention is a method of processing an incompletely drawn yarn obtained by side-by-side composite spinning of an elastic multifilament yarn and an inelastic multifilament yarn by subjecting it to a drawing-relaxation fluid treatment. The present invention relates to a covered elastic yarn in which an inelastic multifilament yarn is entwined with an elastic multifilament yarn, and a method for manufacturing the same.

[Prior Art] In recent years, as a method for manufacturing covered elastic yarns, many methods have been proposed in which thermoplastic synthetic filament yarns are entangled with elastic yarns by fluid treatment. Although this method has the advantage of rapid production, it has drawbacks such as uneven coating properties and poor coating performance. In other words, if the coverage is weak, the elastic yarn and multifilament yarn will easily separate due to the tension applied during weaving and knitting, resulting in skipped stitches, holes, exposed elastic yarn, uneven dyeing, etc. and significantly deteriorate the quality of the product. In addition, uneven entanglement and lack of bulk deteriorate the appearance of the product.

In order to overcome these shortcomings and to improve the coating performance, methods using high-pressure fluid or twisting have generally been used. However, these methods significantly increase processing costs due to the generation of high-pressure fluid, and also have quality problems such as the multifilament yarn intertwined with the elastic yarn, which causes unevenness in the intertwining in the longitudinal direction of the yarn and reduces bulk. There is a problem. Furthermore, when twisting is used, a new twisting process is required, leading to an increase in processing costs.

[Problems to be Solved by the Invention] In view of the above-mentioned points, the present invention has a method in which elastic yarns and inelastic yarns are mixed to form a ring-like or loop-yasnar-like entanglement, which is sufficient for low-pressure fluid treatment. The purpose of the present invention is to provide a coated elastic yarn with excellent coating performance and uniformity, and to provide a method for manufacturing the same at high speed and at low cost.

[Means for Solving the Problems] The present invention that achieves the above-mentioned object consists of the following configuration.

That is, the covered elastic yarn of the present invention has elastic filaments 11
-1a and inelastic filament fibers and having a substantially core/sheath-like structure, the inner core portion of the yarn has many elastic filament fibers unevenly distributed, and the sheath portion has a large amount of elastic filament fibers. A large number of inelastic filament fibers are unevenly distributed, and at least fibers having a composite filament shape formed by joining an elastic filament component and an inelastic filament component are present in the inner core, and It is a coated elastic yarn characterized by intertwined filament fibers.

In addition, the method for producing the covered elastic yarn of the present invention includes multifilament undrawn yarn or incompletely drawn yarn made of composite filament fibers obtained by side-by-side composite spinning of a thermoplastic elastic polymer and a thermoplastic inelastic polymer. This method of producing a covered elastic yarn is characterized in that the yarn is stretched to peel off a part of the side-by-side composite state, and then the yarn is subjected to a fluid entanglement treatment while being relaxed.

[Effect] The present invention will be explained in more detail below.

In the present invention, the elastic filament fibers that are unevenly distributed and present in large quantities in the inner core of the yarn are polyester elastomer,
Any material having elastic properties such as polyurethane elastomer may be used. Further, as the inelastic filament fibers which are unevenly distributed and present in large numbers in the sheath portion, thermoplastic synthetic 8M filaments such as polybutylene terephthalate, polyester, polyamide, etc. can be employed. However, as described later, the elastic filament m1ti and the inelastic filament 1Ii4#L are subjected to side-by-side composite spinning using the same spindle, so both filaments must have similar melting points or a combination of polymers that are compatible It is important to choose. For example, most preferred combinations include polybutylene terephthalate elastomer as the elastic filament fiber and polybutylene terephthalate or polyethylene terephthalate as the inelastic filament fiber, or a combination in which the former is a polyurethane elastomer and the latter is a polyamide. In other words, in the case of a combination of polybutylene terephthalate-based elastic polymer and polybutylene terephthalate-based inelastic polymer, the characteristics of polyethylene terephthalate, which is often distributed in the sheath part, can be fully utilized, resulting in improved tension, stiffness, and set properties. dimensional stability,
It has excellent light resistance, seedling prevention, etc., and is ideal for outer clothing. In addition, in the case of a combination of polybutylene terephthalate-based elastic polymer and polybutylene terephthalate-based non-elastic polymer, the polybutylene terephthalate-based non-elastic polymer itself, which is mostly disposed in the sheath part, is generally relatively rich in elasticity, The elasticity of the covered elastic yarn can be made extremely high, and it is especially suitable for outer garments that require high elasticity.

In addition, in the case of a combination of polyurethane polymer and polyamide-based inelastic polymer, it is possible to fully utilize the characteristics of the polyamide-based fibers that are abundantly distributed in the sheath, which makes it strong against friction and has a soft texture, as well as hygroscopicity. Therefore, it is suitable for innerwear, pantyhose, socks, etc. around the legs.

To explain the structure of the coated elastic yarn of the present invention with reference to the drawings, FIG. 1 shows an example of the side surface form of the coated yarn exhibiting an intermittent entanglement state due to air entanglement treatment, where 1 is a sheath filament fiber; Reference numeral 2 indicates the core filament fiber, 3 indicates the entangled convergence section, and 4 indicates the fibrillation section. FIG. 2 is a schematic diagram illustrating a yarn cross-sectional form as a model, in which 5 is an inelastic filament fiber, 6 is an elastic filament fiber, and 7 is a composite filament formed by joining an elastic filament component and an inelastic filament component. aim, elastic filament fibers 6 are unevenly distributed in the core part of the system, many inelastic filament fibers 5 are unevenly distributed in the sheath part, and elastic filament components and elastic filament fibers are roughly present in the inner core part. At least there are composite filament fibers 7 in which the inelastic filament component is joined in a side-by-side composite form. In general, many of these composite filament fibers are unevenly distributed in the core, and the composite filaments 7 are formed by peeling some of the composite filaments into their respective components by drawing out of the composite multifilament yarn originally spun by composite spinning. The elastic filament fibers 6 and the inelastic filament fibers 5 are obtained in this manner, but these are the parts that remain as they are without being peeled off, and in particular, these parts are concentrated unevenly distributed near the center of the core part. It is something to do. Such composite filament fibers 7 may exhibit a composite state over the entire length of the yarn, but even if there are partially peeled portions or non-peeled portions in the longitudinal direction of the yarn. good.

Furthermore, in the yarn of the present invention, all of the composite filaments may have a mixture of parts where both composite components are peeled and parts where they are not peeled, in which case, When one cross-section of a thread is taken, there are many peeled filaments in the peeled part, peeled inelastic filaments in the outer periphery of the yarn, and peeled elastic filaments in other bonded (unbound) areas. It is present in large quantities in the yarn core together with the composite filaments (exfoliated).

Next, in the sheath part, a relatively large number of peeled inelastic filament fibers 5 surround and entangle the core part. The tangles are formed from fluid-treated rings, loops, slacks, or alternating twists that are entangled around the elastic or inelastic filaments of the core. In the longitudinal direction of the yarn, intertwined bundled parts and defibrated parts appear alternately, the bundled parts are S1Z alternate twists, and the defibrated parts have rings, loops, or slacks that are bulky. be.

Note that the yarn of the present invention may have a structure in which the constituent filament fibers are continuously intertwined in the longitudinal direction of the yarn.

Next, to explain the method for manufacturing the covered elastic yarn of the present invention, the composite multifilament undrawn yarn as described above is
The yarn is stretched to partially peel off the side-by-side composite state, and then subjected to a fluid entanglement treatment while relaxing the yarn. It is stretched at a stretching ratio lower than the cutting elongation, and then subjected to fluid entanglement treatment while being relaxed by 2% or more.

More specifically, as a supply system, a composite yarn of undrawn yarn or incompletely drawn yarn is used, which is a composite yarn of an elastic filament to be a core yarn and an inelastic filament to be a sheath yarn, spun from a side-by-side spinneret. The composite yarn is once drawn at a mechanical magnification equal to or higher than the natural stretching magnification of the inelastic filament, and the bond between both composite components is partially peeled off, and the inelastic multifilament is stretched. Thereafter, the yarn is relaxed, and the inelastic filaments that are to become the sheath are subjected to air treatment while sagging, thereby giving the yarn a ring, loop, or slack-like entanglement to produce a covered elastic yarn. will be explained using the drawings. FIGS. 4(a), (b), (C), and (d) are schematic diagrams illustrating single fiber cross sections of side-by-side type composite yarns used in the present invention, and the shaded area 15 in the figures is the elastic component. , 16 indicates an inelastic component, (a) is a circular two-part type,
(b) is a long elliptical uneven type, (C) is a triangular type, (d) is a 2
A cross-sectional model of a circular contact type is shown.

In order to achieve the object of the present invention, it is preferable that both components be in an appropriate bonded state, and it is not desirable that the components be tightly bonded in an intricate manner because they are difficult to separate during the stretching step.

FIG. 3 is a process schematic diagram showing an example of the process for manufacturing the covered elastic yarn of the present invention, in which the incompletely drawn yarn 8 of the side-by-night composite yarn is supplied to the stretched feed roller 9, and the stretched delivery roller 11 and a hot plate 10 in the dark. The stretching may be either cold stretching or hot stretching, but in the case of hot stretching, the upper limit is preferably about 150°C.

It is important that the stretching ratio is set to a pre-existing stretching ratio that is equal to or higher than the natural stretching ratio of the inelastic component that will become the sheath. If such a stretching ratio is low, the strength and elongation characteristics of the covered elastic yarn may be lowered, which is not preferable. After part of the side-by-side joint is peeled off by this stretching, the yarn is relaxed by a relaxing roller 13 and subjected to air entanglement treatment by a fluid nozzle 12. This processing can be performed using an interlaced type or an air injection type.

After this air entanglement treatment, the cheese 14 is rolled up via a winding roller (not shown).

[Effects of the Invention] The coated elastic yarn of the present invention has a portion where one elastic component and an inelastic component are joined, and the inelastic multifilament surrounds the portion, so that the covered elastic yarn is unevenly distributed in the core portion. The elastic filaments 1 to 1 are less likely to easily separate from the yarn or be exposed by squeezing with a guide or the like, and high coverage can be maintained. In particular, this effect means that when looking at a single composite filament, an elastic filament in which both composite components are partially separated in the yarn length direction tends to shrink toward the center of the yarn due to the power of the elastic filament. Then, the inelastic filament becomes entangled to surround the periphery of the inelastic filament.

The inelastic filament that mainly makes up the sheath is
It is entwined with the constituent filaments of the core by rings, loops, or slack, but as a yarn, it has high bulk and
The texture has a good spun-touch feel. Among these, a cotton-like touch can be obtained by making the single fiber denier less than 1 denier or by using a modified cross section such as a cocoon shape or a triangular shape.

Regarding dyeability, since the inelastic filaments unevenly distributed in the sheath part use incompletely drawn yarn, they generally have high dyeability and are easily dyed in deep colors. Elastic multifilaments that are unevenly distributed in the core generally have poor dyeability, so dyeing differences between the core and the V generally tend to occur. In fact, because the sheath part has good coverage and evenly surrounds the core part, the difference in dyeing is not noticeable and the dyeing property is good.

Next, in the manufacturing method, the incompletely drawn yarn, etc., which is simultaneously composite-spun of elastic and inelastic components, is used, so stretching, relaxation, and air treatment can be performed in a continuous process at high speeds, making production easier. It has high properties and can be manufactured at low cost. In addition, there are almost no problems with the conventional manufacturing method such as uneven coating due to sea urchin thread and occurrence of thread breakage.
The crystallinity is uniform and the package can be made large.

[Example] Example 1 A raw polyester containing polybutylene terephthalate as a main component and a block polyether ester elastic polymer were subjected to composite spinning using a spinneret capable of exhibiting the composite form shown in FIG. 4(C). 1'7 235 denier, 2
A two-filament incompletely drawn yarn is supplied to the process shown in Fig. 2, drawn at a cold drawing ratio of 29 times, and further subjected to air entanglement treatment at a relaxation rate of +5% in o, a, sm.
A high pressure fluid of 2.5 to 9/- was applied to a two-hole nozzle of m, and the yarn was wound at a processing speed of 120 m/min.
A coated elastic yarn of the present invention was produced. When the yarn made in this way was evaluated, the coverage index was 92, and the inpower was 0゜6q.
/60% recovery, 0.9C1/80% recovery, stretch recovery rate of 63%, the coated elastic yarn had good properties such as good coverage and excellent recovery properties. Note that this yarn had 12 composite filaments and 21 joints (parts) per inch of yarn length. and,
10 other elastic filaments and inelastic filaments
Each book is completely separate and independent, and the former exists in large numbers in the thread core along with the above-mentioned joints;
Many of them were present around the outer periphery of the thread.

Comparative Example As a comparative example, a 30-denier, 22-filament yarn of block polyneedle ester elastic yarn stretched 2.9 times and a 45-denier, 22-filament yarn of inelastic polyester filament 1 to 1 containing polybutylene terephthalate as a main component were used. The drawn yarn was pulled together, and a high pressure fluid of 9/cnf was applied to 2.5 to 9/cnf with a nozzle through two holes of 0.8 χ mm.
When wound at 20 m/min, coverage index 71, inpower 0.52C1/60% recovery, 0.80 g/80%
At the time of recovery, only a coated elastic yarn was obtained with an elasticity recovery rate of 57%, each constituent filament having no joining point and each constituent filament being independent, and coverage being extremely low, and the core elastic filament being easily exposed due to light friction from a guide, etc. .

Example 2 Nylon 6, an inelastic polyamide polymer, and an elastic polyuthalene polymer were composite-spun using a spinneret capable of exhibiting the composite form shown in FIG. , supplied to the process shown in Figure 2, the cold stretching magnification was 3.0 times, and the relaxation rate was +6.
%, air entanglement treatment: 8. When a high pressure fluid of 2.5 kq/- was applied to a ffmm two-hole nozzle and the yarn was wound at a processing speed of 120 m/min, the coverage index was 95, and when the inpower was 0° and 50/60% recovery, it was 0.8 g/80. It was possible to obtain a coated elastic yarn with good coverage and excellent recovery properties with a stretch recovery of +60% at the time of recovery.

This yarn had 43 joints (sections) of 34 composite filaments per inch of yarn length.Therefore, this yarn was completely separated and independent over the entire length of the yarn. It does not have single-component filaments that are separated, but in all composite filaments, there are random parts where the composite component is peeled and parts where the composite component is not peeled, and the peeled filament is the same as the peeled filament. In some locations, inelastic filaments were present in large numbers at the outer periphery of the yarn, and elastic filaments were present in large numbers at the yarn core along with other bonded composite filaments.

In addition, in the above, inpower means yarn trial length 20cm.
In contrast, the length of the thread in the stretched state when a load of 20C1 is hung is temporarily set as 200%, and the thread length when loosening this sample thread (loosen it to half its length and returning it is 100%) ), the stress in each yarn was measured when the yarn was returned to 60% and 80% of its length.

Moreover, the expansion/contraction recovery rate is based on the JIS method.

In addition, the coverage index is 0.1c+/d when the yarn trial length is 1m.
This is the length obtained by suspending a load of 0.1 c+/d to separate the 47 core threads, and then suspending a load of 0.1 c+/d at the separation point, and it must be expressed as a percentage of the redundancy.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a yarn illustrating the structure of an example of the covered elastic yarn of the present invention. FIG. 2 is a schematic cross-sectional view of a yarn illustrating the structure of an example of the covered elastic yarn of the present invention. FIG. 3 is a process schematic diagram illustrating an example of the method for manufacturing a covered elastic yarn of the present invention. FIGS. 4(a) to 4(d) are schematic diagrams showing various single fiber cross-sectional forms of composite incompletely drawn yarn preferably used in producing the covered elastic yarn of the present invention. 1: Sheath Part filament I! Fiber 2: Core filament fiber 3: Entangled convergence part 4: Defibration part 5: Inelastic filament fiber 6: Elastic filament fiber 7: Composite filament fiber 8: Incompletely drawn yarn 9: Stretching feed roller 10 : Hot plate 11: Stretch delivery roller 12: Fluid nozzle 13: Relaxation roller 14: Zeez

Claims (6)

[Claims] (1) A covered elastic yarn having a substantially core/shell-like structure consisting of elastic filament fibers and inelastic filament fibers, in which the inner core of the yarn has many elastic filament fibers unevenly distributed; In the sheath part, there are many inelastic filament fibers unevenly distributed, and in the inner core part there are at least fibers that have a composite filament shape formed by joining an elastic filament component and an inelastic filament component. , and the constituent filament fibers are intertwined. (2) A multifilament undrawn yarn or incompletely drawn yarn made of composite filament fiber obtained by side-by-side composite spinning of a thermoplastic elastic polymer and a thermoplastic inelastic polymer is drawn to form the side-by-side composite state. 1. A method for producing a covered elastic yarn, which comprises peeling off a portion of the yarn, and then subjecting the yarn to a fluid entanglement treatment while relaxing the yarn. (3) The coated elastic yarn according to claim (2), wherein the stretching ratio of the multifilament undrawn yarn is equal to or higher than the natural stretching ratio of the thermoplastic inelastic component and lower than the cutting elongation. Production method. (4) The method for producing a covered elastic yarn according to claim (2) or (3), wherein the covered elastic yarn is subjected to a fluid entanglement treatment while being relaxed at a relaxation rate of 2% or more. (5) Claim No. 2, characterized in that the thermoplastic elastic polymer is a polybutylene terephthalate-based elastic polymer, and the thermoplastic inelastic polymer is a polyethylene terephthalate-based or polybutylene terephthalate-based inelastic polymer. ), (3) or (4). (6) Claims (2) and (3) characterized in that the thermoplastic elastic polymer is a thermoplastic polyurethane polymer, and the thermoplastic inelastic polymer is a thermoplastic polyamide-based inelastic polymer. The method for producing a covered elastic yarn according to item (4) or item (4).