WO2020159268A1 - Composite core-spun yarn having improved elastic recovery and shrinkage, and method for producing same - Google Patents

Abstract

The present invention pertains to a core-spun yarn and a method for producing same, which are characterized in that a core yarn includes two strands of an elastic fiber and at least one strand of a non-elastic fiber, and the entirety of the core yarn is coated with a hard yarn.

Description

Composite core spun yarn with improved elastic recovery and shrinkage and its manufacturing method

The present invention relates to a composite core spun yarn having improved elastic recovery and shrinkage, and a method for manufacturing the same, specifically, the core yarn is composed of two strands of spandex fibers and one or more non-elastic fibers (bicomponent elastic filaments), and these two strands It relates to a core spun yarn and a method for manufacturing the elastic fibers and the entire non-elastic fibers of at least one strand with a hard yarn.

In the case of stretch fabrics conventionally used for denim, spandex is woven into a core spun yarn used as a core yarn. In this case, for imparting stretchability, stretchable fibers in the core spun yarn (CSY) are used as the core yarn, and a single strand of spandex is used as the stretchable fiber, or two strands of polyester bicomponent fiber and spandex (dual core) G) is generally used.

Denim fabrics with dual-core yarns with two strands of spandex and polyester bicomponent fibers are widely used. However, when a dual core yarn is applied to the core yarn in the core spun yarn, the stretchability of the fabric is not a problem compared to the fabric with the same spandex, but a fabric having better resilience is required. It is important that the garment is not permanently deformed by repeated desorption when the wearer wears the garment. However, in general, when the dual-core yarn-applied fabric is woven into a garment and is repeatedly worn by a wearer, a problem occurs that the fabric does not recover to its original shape after being stretched in some areas such as knees and waists, and is permanently deformed. There is a problem. Therefore, there is a need for improved corespun yarns with better recovery and elongation properties than dual-core corespun yarns.

In addition, when a separate input device of one strand of elastic yarn is added to a conventional covering device that covers one strand of elastic yarn and one strand of inelastic yarn together, the volume of the core spinning apparatus becomes excessively large, thereby reducing the efficiency of the working space. In addition, when a separate injection device is added, different yarns of the two elastic yarn injection devices are induced, and the core spun yarn in which elastic yarns are injected at the same speed is not commercially available because the uniformity of yarn properties including elasticity recovery is not secured. did. Due to the above problems, core spun yarns for denim composed of two strands of spandex and one or more inelastic fibers have not been tried.

In the present invention, in the core spun yarn of a stretch fabric used for denim use and a method for manufacturing the same, the elastic recovery and shrinkage of the core spun yarn are improved by applying two or more elastic fibers and at least one strand of non-elastic fibers to the core yarn to improve the fabric. The object of the present invention is to provide a denim fabric with improved permanent deformation and recoverability at the same time.

As a means for solving the above-mentioned problems,

The core spun yarn having improved elastic recovery and shrinkage of the present invention, the core yarn is composed of two strands of spandex fibers and one or more non-elastic fibers (bicomponent elastic filaments), and the entire elastic fibers of the two strands and one or more non-elastic fibers Is solved by preparing a core spun yarn coated with a hard yarn.

When the present invention is to improve the elastic recovery and shrinkage of the core spun yarn constituting the stretch fabric used for denim use, by applying two or more elastic fibers and at least one strand of non-elastic fibers to the core yarn, when using a general dual core Compared to the core spun yarn, it has an excellent effect of stretch recovery and shrinkage.

1 is a schematic view of a core spun yarn manufacturing apparatus according to an embodiment of the present invention having two strands of spandex fibers and one strand of inelastic fibers as core yarns.

2 is a schematic view of a core spun yarn manufacturing apparatus according to an embodiment of the present invention having one strand of non-elastic fibers as a core yarn in addition to covering two strands of spandex fibers with non-elastic fibers.

Hereinafter, the present invention will be described in detail.

In the present invention, in the core spun yarn constituting the denim woven fabric, the core yarn is composed of two strands of spandex fibers and one or more non-elastic fibers (bicomponent elastic filaments), and the entire elastic fibers of the two strands and at least one non-elastic fiber It relates to a core spun yarn having improved elastic recovery and shrinkage, characterized in that coated with a hard yarn, and a method for manufacturing the same.

The elastic fibers according to the present invention include spandex. At this time, the spandex corresponding to the elastic fiber is limited to two deniers capable of replacing one strand of the existing dual-core yarns, and the spandex of the two strands may each have the same thickness or different thickness. As an example, in the present invention, two strands of 40 denier were used by replacing one strand of 70 denier. However, the thickness is not limited to this example and may be applied to a thickness of less or more. When one strand of spandex is replaced with two thin strands of yarn thickness, it has excellent elasticity and high elastic recovery rate as compared to the general spandex of one strand, so that a fabric having higher recovery performance can be finally provided.

The non-elastic fiber according to the present invention means a stretchable filament that does not contain an elastomeric fiber. Bicomponent stretchable filaments, PBT stretchable filaments, PTT stretchable filaments, PET, and the like. The thickness of the non-elastic fiber may be 30 to 120 denier, but is not limited thereto, and a thickness of less or more may also be applied. An example of an inelastic fiber is Xanadu from Hyosung. One or more strands of non-elastic fibers included in the core spun yarn have low elastic modulus to provide a fabric having low shrinkage and high recovery performance.

In the present invention, three strands of core yarns of the core spun yarn may be input in parallel, and two strands of elastic yarns may be added in a single coating or double coated form, and two strands of elastic yarns may be single coated or double coated. In addition, there may be a single inelastic sacrament. When the core yarn of the core spun yarn is replaced with two strands of spandex, the shrinkage performance of the two strands of spandex is maintained while the strength is improved compared to that of one strand, resulting in improved elasticity and recovery when manufactured with core spun yarn. Shrinkage can be obtained.

In the core spun yarn used for denim, there is no technology in which three or more strands of core yarn included in the core spun yarn are applied. When a separate input device for one strand of elastic yarn is added to a conventional covering device for covering one strand of elastic yarn and one strand of inelastic yarn together, the volume of the core spinning apparatus is excessively large, thereby reducing the efficiency of the working space. This has the problem of reducing the work efficiency for the operator. In addition, when a separate injection device is added, a problem occurs that is influenced by the dissociation property of the elastic yarns due to different yarns of the added elastic yarn injection device and the existing device. The elastic yarns of two strands injected at different speeds by different yarns cause a problem of lowering the uniformity of yarn properties, including the elastic recovery properties of the core spun yarn. Due to the above problems, core spun yarn for denim composed of two strands of spandex and one or more inelastic fibers has not been tried.

In the present invention, by developing a spandex feeding device for the core spun yarn in a compressed form, core yarns and sheaths were manufactured in a spinning apparatus using a ring spinning or open-end spinning process to prepare the core spun yarn.

When two strands of spandex and one strand of inelastic fibers are applied as the core yarn, the compressed form of the spandex feeding device is applied in the process as shown in FIG. 1. The device includes an integral feed roller that is not separated from the top and bottom while minimizing the distance between the two strands of elastic yarn. The feed roller located on the front side and the feed roller located on the back side are in a fixed form with an interval of 15 cm to 25 cm, and are fixed with rails so that the upper and lower feed rollers can operate at the same speed. This is a device design that does not affect the spatial workability in the width direction and does not degrade the work efficiency of the operator. In addition, an additional speed adjusting roller was added to the upper feeder so that the feeder located in the upper and lower portions could be fed at the same speed so that the threaded yarn in the core spinning apparatus could be drafted to the same yarn. When adding a new dosing device to an existing dosing device, the possibility of producing a low-uniform core spun yarn is remarkable due to the different abrasiveness and dissociation problems between the two rollers. However, when the device is applied, it is possible to manufacture a core spun yarn having excellent yarn uniformity and desirable stretch recovery and shrinkage.

When using two strands of spandex as a core yarn by adding one strand of non-elastic fibers in addition to the one covered with non-elastic fibers, the conventional process is to first cover the two strands of spandex with one strand of non-elastic yarns, and then the first covered yarn And a non-elastic fiber can be produced by finally covering the core spinning device with a hard yarn. Since this process has to go through a two step process, it causes a decrease in workability and productivity. Due to this problem, in addition to covering two strands of spandex with non-elastic fibers, a core spun yarn using one strand of non-elastic fibers as a core yarn has not been attempted to date.

In the present invention, a core spun yarn for denim composed of two strands of spandex and one or more strands of non-elastic fibers was manufactured by a one step process by applying an input device for compressed core spun yarn. By the above-mentioned non-separated integral feed roller action, two spandex strands are unwound at the same speed and covered with one strand of inelastic fibers. The covering process may be a single covering, air covering, double covering, or conventional covering, and the covering method is not limited thereto. The yarn covered with two strands of spandex and one strand of non-elastic fibers is not wound on a branch pipe, but is then unwound together with one strand of non-elastic fibers by a feed roller and core-spun from a spinning mechanism to a sheath yarn. As a result, the one-step core spinning process of the core spun yarn having two strands of spandex and one or more strands of non-elastic fibers as a core yarn is completed by a simultaneous core yarn supply device without going through two stages.

In this patent application, by developing an apparatus capable of simultaneously and simultaneously performing the primary covering process and the secondary spinning process, the winding process of the primary covering yarn can be eliminated, thereby contributing to improving work productivity and improving uniformity of the yarn. In addition, the core spun yarn produced by this process may have better recovery performance and lower shrinkage characteristics than the core spun yarn for denim.

The sheath of the core spun yarn of the present invention is characterized by being a hard yarn. The hard yarn is any one selected from the group consisting of wool, linen, silk, polyester, nylon, olefin, cotton, and combinations thereof. The preferred hard yarn of the present invention is cotton.

For reference, in FIGS. 1 and 2, 10 is an elastic fiber, 20 is a roving yarn, 30 is an inelastic fiber, 40 is a core spun yarn, 100 is an integral yarn feeding device, 110 is an upper feed roller, 120 is a lower feed roller, 130 Silver core yarn supply roller, 140 is a yarn take-off cylinder, 150 is a yarn moving unit, 160 is a cobb, 170 is a core yarn covering device, 180 is a covering yarn winding roller, respectively.

Hereinafter, the present invention will be described in detail through specific examples and comparative examples, and these examples are only for illustrating the present invention and should not be interpreted as limiting the scope of the present invention.

The physical properties of the woven fabrics shown in Examples and Comparative Examples described below were measured by the following methods.

Corespunyan Method for evaluating properties

Sample preparation of the core spun yarn according to the present invention, elasticity recovery, and measurement of shrinkage are performed in the following manner.

1. Preparation of Samples: A total of 20 strands of each corespunyan sample are prepared.

2. Conditioning: Each specimen is allowed to achieve moisture equilibrium for testing in a standard environment or in a specific environment.

Elasticity recovery (%) and shrinkage (%)

The continuous corespun yarn is suspended vertically from a fixed stand of some sort, and a weight of 5 mg/d is placed in parallel to measure its length. (A ₀ ) Then, a weight of 150 mg/d is hung on the corespun yarn and its length. Measure (B ₀ ).

After removing the weight of 150 mg/d, the core spun yarn was subjected to non-aqueous treatment at 90° C. for 20 minutes, and then conditioned to air dry.

The weights (A ₁ ) and (B ₁ ) were measured by attaching weights corresponding to 5 mg/d and 150 mg/d again. The elastic recovery (%) = (B ₁ -A ₁ ) / B ₁ was calculated, and the shrinkage (%) = (B ₀ -B ₁ ) / (B ₀ ) *100 was calculated by the formula.

Manufacturing example

In the case of core spun yarn, a general ring spun method was used, and cotton yarn 21 water yarn was used as the hard yarn. The spandex (DR) of the spandex used in the corespunyan was prepared at 3.8 times (i.e., 280% elongation). Each core spun yarn was manufactured under the same conditions, and only the composition of core yarns was changed.

Example 1

Core yarn is composed of two strands of 40D spandex fibers and one 75D strand of inelastic fibers (bicomponent elastic filaments), the core spun yarn of which two strands of elastic fibers and one or more strands of inelastic fibers are covered with 16 cotton yarns Was prepared.

Example 2

The core yarn covered two strands of 40 D spandex yarn with 75 D non-elastic fibers (bicomponent elastic filaments) and 75 D non-elastic fibers (bicomponent elastic filaments) strands, and the entire core yarn was 16. A core spun yarn coated with cotton yarn was prepared.

Comparative Example 1

The core yarn was composed of one strand of 70D spandex yarn and one strand of 75D non-elastic fiber (bicomponent stretchable filament), and a core spun yarn was prepared by covering the entire core yarn with 16 cotton yarns.

Comparative Example 2

The core yarn was composed of two strands of 40D spandex yarn, and a core spun yarn was prepared in which the entire core yarn was coated with 16 cotton yarns.

Comparative Example 3

The core yarn was composed of a single strand of 70D spandex yarn, and a core spun yarn was prepared in which the entire core yarn was coated with 16 cotton yarns.

Table 1 shows the stretch recovery and shrinkage of the core spun yarn obtained by the examples and comparative examples.

In order to determine the degree of improvement of the permanent deformation and recovery characteristics of the stretch fabric in the core spun yarn state, elastic recovery (%) and shrinkage (%) items are used.

The core spun yarn according to the present invention preferably has a stretch recovery (%) of 45% or more and a shrinkage rate (%) of 2% or less. More preferably, it is preferred that the elastic recovery (%) is 50% or more and the shrinkage (%) is 1.7% or less. If the elastic recovery (%) is less than 45% and the shrinkage (%) is more than 2%, the fabric made of the core spun yarn does not maintain its shape after dyeing and various processing processes, and the fabric is excessively stretched after repeated wear. There are problems that result in permanent deformation of the site.

Claims (8)

1. The core yarn is composed of two strands of spandex fibers and at least one non-elastic fiber, and a core spun yarn in which the two elastic fibers and the entire at least one non-elastic fiber are coated with hard yarn.
2. The core spun yarn of claim 1, wherein the core spun yarn has an elasticity recovery (%) of 45% or more and a shrinkage ratio (%) of 2% or less.
3. The core yarn is a core spun yarn in which two strands of a spandex yarn are covered with an inelastic fiber and one strand of an inelastic fiber is used, and the entire core yarn is coated with a hard yarn.
4. [4] The core spun yarn according to claim 3, wherein the core spun yarn has an elasticity recovery (%) of 45% or more and a shrinkage (%) of 2% or less.
5. The core yarn is composed of two strands of spandex fibers and at least one non-elastic fiber, and characterized in that the entire elastic fiber and the at least one strand of non-elastic fibers are covered with hard yarn.
6. The method for manufacturing a core spun yarn according to claim 5, wherein the elastic recovery (%) of the core spun yarn is 45% or more and the shrinkage rate (%) is 2% or less.
7. The core yarn is a method of manufacturing a core spun yarn, characterized in that two strands of a spandex yarn are covered with non-elastic fibers, and one non-elastic fiber is used, and the entire core yarn is covered with a hard yarn.
8. The method of claim 7, wherein the core spun yarn has a stretch recovery (%) of 45% or more and a shrinkage rate (%) of 2% or less.

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