KR20030021967A - Method and Apparatus for producing twisted composite yarn with different tones - Google Patents

Method and Apparatus for producing twisted composite yarn with different tones Download PDF

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Publication number
KR20030021967A
KR20030021967A KR1020010055565A KR20010055565A KR20030021967A KR 20030021967 A KR20030021967 A KR 20030021967A KR 1020010055565 A KR1020010055565 A KR 1020010055565A KR 20010055565 A KR20010055565 A KR 20010055565A KR 20030021967 A KR20030021967 A KR 20030021967A
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South Korea
Prior art keywords
yarn
heat treatment
yarns
heat
composite twisted
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KR1020010055565A
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Korean (ko)
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박성우
한선주
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한국섬유개발연구원
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Priority to KR1020010055565A priority Critical patent/KR20030021967A/en
Publication of KR20030021967A publication Critical patent/KR20030021967A/en

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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/16—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using jets or streams of turbulent gases, e.g. air, steam
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/02—Heat treatment
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D02G3/28—Doubled, plied, or cabled threads
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

PURPOSE: A method and apparatus for preparing an irregular-shaped composite false twisted yarn by simultaneously processing two or more yarns different in thermal characteristic without causing deterioration in physical properties are provided. Therefore, the method permits a composite false twisted yarn of two-tone color to be produced in high productivity with a single apparatus. CONSTITUTION: Two or more yarns different in thermal characteristic are passed through two or more heat treatment areas of a different temperature, false twisted and then air textured. For an example, a first yarn which is not heat-sensitive and a second yarn which is heat-sensitive are passed through a roller(1a,1b) and contact type heater(2) in a combined state and further passed though a first heater having a heat treatment area of a different temperature in each separated state. The heat treated yarn is cooled in a cooling plate(4), simultaneously twisted by a twisting means(5) and then air textured by an air texturing means(6).

Description

이색조 복합가연사의 제조방법 및 장치{Method and Apparatus for producing twisted composite yarn with different tones}Manufacturing method and apparatus for dichroic composite twisted yarn {Method and Apparatus for producing twisted composite yarn with different tones}

본 발명은 복합가연사의 제조방법에 관한 것으로서, 보다 구체적으로는 서로다른 열적특성을 갖는 원사들을 동시에 가공하여 이색조 복합가연사를 제조하는 방법에 관한 것이다.The present invention relates to a method for manufacturing composite twisted yarn, and more particularly, to a method for manufacturing a dichroic composite twisted yarn by simultaneously processing yarns having different thermal characteristics.

폴리에스테르 혼섬사는 촉감 등이 우수하여 주로 의류용 원사로 많이 사용되고 있다. 폴리에스테르 혼섬사를 제조하는 종래기술로서 대한민국 공개 특허 1992-12850호 및 동 1997-43418호 등과 같이 가연후 신장회복특성을 이용하기 위하여 상대적으로 신도가 낮은 폴리에스테르 연신사를 코아사로 사용하고 상대적으로 신도가 높은 폴리에스테르 반연신사를 효과사로 사용하여 이들의 섬도 및 공급율을 적절하게 조절하면서 가연하는 방법이 알려져 있다. 또한 일본특허공고 평 8-1015호에는 신도차가 있는 2종류 이상의 원사를 사용, 가연함으로써 신도가 낮은 원사는 복합가연사의 코아사의 구조로, 신도가 높은 원사는 복합가연사의 효과사의 구조가 되게 하는 방법을 기술하고 있다. 이러한 방법으로 제조되는 복합가연사는코아사와 효과사의 염색성이 상이하여 최종제품상에서 투톤(two-tone)이 발생되는 이색조 특성을 갖게 된다.Polyester blended yarn has excellent touch and is mainly used as a yarn for clothing. As a conventional technique for manufacturing polyester blended yarns, polyester elongated yarns having a relatively low elongation are used as cores to utilize elongation recovery characteristics after combustion, such as Korean Patent Publication Nos. 1992-12850 and 1997-43418. It is known to use a highly elongated polyester semi-stretched yarn as an effect yarn and to burn them while appropriately adjusting their fineness and feed rate. In addition, Japanese Patent Publication No. Hei 8-1015 uses two or more kinds of yarns with elongation difference and burns them so that the low elongation yarn is the core yarn of composite twisted yarn and the high yarn is the effect yarn of composite twisted yarn. It describes. The composite twisted yarn manufactured by this method has a dichroic characteristic in which two-tones are generated on the final product due to different dyeing properties of core yarn and effect yarn.

그러나 이러한 방법들은 가연되는 원사의 열적특성이 상이하여 동시에 열처리하여 복합가연하는 경우 원사의 물성열화가 발생하기 때문에 각 원사에 대하여 적정한 온도로 독립적으로 열처리한 후 복합가연하는 방법을 채택하여 왔고, 그 결과 복합가연사의 제조공정이 복잡하고 생산성이 떨어지는 등의 문제점을 안고 있는 것이었다.However, since these materials have different thermal properties of combustible yarns, and the composites are heat treated at the same time, the properties of the yarns are deteriorated. Therefore, a method of complex combustion after heat treatment independently at an appropriate temperature has been adopted. As a result, the manufacturing process of the composite twisted yarn was complicated and the productivity was low.

따라서 본 발명은 열적특성이 다른 2종류의 이상의 원사를 물성의 열화를 일으킴이 없이 동시에 가공하여 이색조의 불규칙 복합가연사를 제조할 수 있는 방법을 제공하는 것을 주된 목적으로 한다.Accordingly, an object of the present invention is to provide a method for producing two-color irregular composite twisted yarn by simultaneously processing two or more kinds of yarns having different thermal characteristics without causing deterioration of physical properties.

본 발명의 또한 목적은 상기한 목적을 구현하기에 바람직한 장치를 제공하는 것에 있다.It is a further object of the present invention to provide a preferred device for realizing the above object.

상기한 목적을 달성하기 위한 본 발명자의 연구에서, 혼섬가연될 원사를 단일열처리 수단에서 서로 다른 온도로 열처리 할 수 있도록 설계하여 열처리한 후 동시 가연후 공기교락하게 되면 열적특성이 상이한 2이상의 원사를 물성열화를 유발함이 없이 단일 장치에서 이색조 복합가연사를 향상된 생산성으로 제조할 수 있게 된다는 사실을 알게되었다.In the study of the present inventors for achieving the above object, two or more yarns having different thermal properties are produced if the yarns to be mixed and burned at a different temperature in a single heat treatment means are heat treated after simultaneous combustion and interlaced with air. It has been found that dichroic composite twisted yarn can be manufactured with improved productivity in a single device without causing physical deterioration.

도 1은 본 발명의 바람직한 일 구현에 따라 서로 다른 온도의 두 열처리 영역을 갖는 열고정히터를 이용하는 이색조 복합가연사의 제조장치도이고,1 is a manufacturing apparatus diagram of a dichroic composite twisted yarn using a heat setting heater having two heat treatment zones having different temperatures according to a preferred embodiment of the present invention.

도 2는 본 발명의 바람직한 다른 구현에 따라 서로 다른 온도의 두 열처리 영역을 갖는 접촉식 핫핀 타입 히터를 이용하는 이색조 복합가연사의 제조장치도이다.2 is a manufacturing apparatus diagram of a dichroic composite twisted yarn using a contact hot fin type heater having two heat treatment regions at different temperatures according to another preferred embodiment of the present invention.

*도면중 주요부분에 대한 간단한 설명** Brief description of the main parts of the drawing *

1a, 1b, 1c : 로울러1a, 1b, 1c: Roller

2 : 접촉식 핫핀타입 히터2: contact hot fin type heater

2a: 제1 열처리 영역, 2b : 제2 열처리 영역2a: first heat treatment region, 2b: second heat treatment region

3 : 제1 열고정 히터3: first heat setting heater

3a: 제1 열처리 영역, 3b: 제2 열처리 영역3a: first heat treatment region, 3b: second heat treatment region

4 : 냉각수단4: cooling means

5 : 가연수단5: flammable means

6 : 공기교락수단6: air interlocking means

7 : 제2 열고정 히터7: second heat setting heater

8 : 오일공급로울러8: oil supply roller

9 : 권취수단9: winding means

그러므로 본 발명에 의하면, 열적특성이 서로 다른 2이상의 원사를 사용하여 이색조의 불규칙 복합가연사를 제조하는 방법에 있어서, 서로 다른 온도의 2 이상의 열처리 영역을 갖는 단일 열처리 수단에서 각각의 원사를 이에 부합하는 온도의 열처리 영역을 통과시켜 동시에 열처리한 후에 가연하고 공기교락하는 것을 특징으로 하는 이색조의 불규칙 복합가연사의 제조방법이 제공된다.Therefore, according to the present invention, in the method for producing irregular composite twisted yarn of dichroic color using two or more yarns having different thermal characteristics, each yarn may be matched with each other in a single heat treatment means having two or more heat treatment zones at different temperatures. There is provided a method for producing a random composite twisted yarn of a dichroic tank characterized in that it is combustible and air-interlocked after passing simultaneously through a heat treatment zone of temperature.

또한 본 발명에 의하면, 열적특성이 서로 다른 2이상의 원사를 사용하여 이색조의 불규칙 복합가연사를 제조하기 위한 장치에 있어서, 서로 다른 온도의 2 이상의 열처리 영역을 갖는 단일 열처리 수단과, 상기 열처리 수단 하류에 열처리된 원사를 가연하기 위한 가연수단과, 상기 가연수단 하류에 공기교락수단이 구성되는 것을 특징으로 하는 이색조 복합가연사 제조장치가 제공된다.According to the present invention, there is also provided an apparatus for producing a dichroic irregular composite twisted yarn using two or more yarns having different thermal characteristics, comprising: a single heat treatment means having two or more heat treatment regions at different temperatures, and downstream of the heat treatment means. The apparatus for manufacturing a dichroic composite twisted yarn is characterized in that a combustion means for combusting heat-treated yarn and an air interlocking means downstream of the combustion means.

이하, 도면을 참조하여 본 발명을 보다 상세하게 설명하기로 한다.Hereinafter, the present invention will be described in more detail with reference to the drawings.

본 발명의 주된 특징은 열적특성이 서로다른 원사를 사용하여 이색조 복합가연사를 제조하는데 있어서, 각각 독립된 가공라인을 통해 원사를 가공한 후에 혼섬하는 종래의 방법과는 달리 단일 가공라인을 통해 이색족 복합가연사의 제조가 가능하도록 서로 다른 온도의 2 이상의 열처리 영역을 갖는 단일 열처리 수단에서 각각의 원사를 이에 부합하는 온도의 열처리 영역을 통과시켜 동시에 열처리한 후 동시에 가연하고나서 공기교락 하는 것에 있다.The main feature of the present invention is to produce a dichroic composite twisted yarn using yarns having different thermal properties, unlike the conventional method of blending yarns after processing yarns through independent processing lines, and dichroic groups through a single processing line. In the single heat treatment means having two or more heat treatment zones of different temperatures to allow the production of composite twisted yarns, each yarn is passed through a heat treatment zone of a corresponding temperature and simultaneously heat treated, and then flammed at the same time.

도 1에는 본발명을 구현하기 위한 바람직한 장치의 일예가 개략적으로 예시된다. 도시되는 장치에서, 열에 강한 제1원사(A)와 열에 약한 제2원사(B)는 합친상태에서 로울러(1a, 1b) 및 접촉식 핫핀 타입 히터(2)를 통과한 후 각각 분리된 상태에서 서로 다른 온도의 열처리 영역을 갖는 제1 히터(2)를 통과하여 열처리된다. 이때, 제1원사(A)는 상대적으로 높은 온도로 설정된 제1 열고정 히터(2)의 제1열처리영역(2a)을, 제2원사(B)는 상대적으로 낮은 온도로 설정된 제1 열고정 히터(2)의 제2열처리영역(3b)을 통과하여 동시에 열처리를 받게 된다. 이와 같이 열처리된 원사는 원사의 물성열화없이 동시가연이 가능한 상태가 된다. 도시되는 장치에서는 설명의 편의상 2 영역만을 나타내었으나, 처리되는 실의 종류 및 수에 따라 2영역 이상으로 설계할 수 있는 것이다.1 schematically illustrates an example of a preferred apparatus for implementing the present invention. In the device shown, the heat-sensitive first yarn A and the heat-sensitive second yarn B pass through the rollers 1a and 1b and the contact hot fin type heater 2 in a combined state, respectively, and then in a separate state. The heat treatment is performed by passing through the first heater 2 having heat treatment regions of different temperatures. In this case, the first yarn A is the first heat treatment region 2a of the first heat setting heater 2 set at a relatively high temperature, and the second yarn B is the first heat setting set at a relatively low temperature. The second heat treatment region 3b of the heater 2 passes through the heat treatment at the same time. The heat-treated yarn is in a state capable of simultaneous combustion without deterioration of physical properties of the yarn. In the illustrated device, only two areas are shown for convenience of description, but the two devices may be designed according to the type and number of yarns to be treated.

이와 같이 열처리된 원사는 냉각판(4)에서 함께 냉각된 후 가연수단(5)에서 동시가연된다. 이때 가연장치로는 트위스트벨트식 가연수단, 스핀들식 가연수단, 또는 마찰식 가연수단 등 임의의 가연수단을 사용할 수 있다.The heat treated yarns are cooled together in the cooling plate 4 and then co-burned in the combustion means 5. At this time, as the combustion device, any combustion means such as twist belt type combustion means, spindle type combustion means, or friction type combustion means can be used.

가연된 사조는 공기교락수단(6)에서 공기교락에 의해 혼섬된 다음, 제2 열고정 히터(7)에서 열고정되고 오일링로울러(8)에 의해 유제처리된 후, 권취수단(9)에 권취된다.The combustible thread is mixed with air in the air interlocking means 6 and then heat-set in the second heat setting heater 7 and emulsified by the oil ring roller 8, and then wound on the winding means 9. It is wound up.

도 2에는 본 발명의 다른 구현에 따르는 이색조 복합가연사의 제조장치가 개략적으로 도시된다. 도시되는 장치가 도 1의 장치와 다른 점은 제1 열고정 히터(3)는 단일 열처리 영역으로 설계되고, 1차 히터에 원사를 공급하기 전에 원사가 2개의 열처리 영역을 갖는 접촉식 핫핀타입 히터(2)에서 열처리되도록 한다는 것이다. 이때, 제1원사(A)는 상대적으로 높은 온도로 설정된 접촉식 핫핀타입 히터(2)의 제1열처리영역(2a)을, 제2원사(B)는 상대적으로 낮은 온도로 설정된 접촉식 핫핀타입 히터(2)의 제2열처리영역(2b)을 통과하여 동시에 열처리를 받게 된다. 또한, 제1히터(3)는 이를 통과하는 각각의 원사가 물성이 열화되어 후속 가연과정에서 가연불량이 발생하지 않는 온도로 설정하는 것이 바람직하다. 이러한 장치는 제1히터에서 열처리되기 전에 원사를 연신할 필요가 있는 경우에 효과적이다.Figure 2 schematically shows an apparatus for manufacturing a dichroic composite twisted yarn according to another embodiment of the present invention. The illustrated apparatus differs from the apparatus of FIG. 1 in that the first heat-setting heater 3 is designed as a single heat treatment zone, and the contact hot fin type heater in which the yarn has two heat treatment zones before feeding the yarn to the primary heater. It is to be heat treated in (2). In this case, the first yarn (A) is the first hot treatment region (2a) of the contact type hot fin type heater 2 set to a relatively high temperature, the second yarn (B) is a contact hot fin type set to a relatively low temperature The second heat treatment region 2b of the heater 2 passes through the heat treatment at the same time. In addition, it is preferable that the first heater 3 is set to a temperature at which each yarn passing therethrough is deteriorated in physical properties so that flammable defects do not occur in a subsequent combustion process. Such an apparatus is effective when it is necessary to draw yarn before heat treatment in the first heater.

도시되는 장치들에서 원사는 보빈에 권취된 상태로 예시되어 있으나, 방사장치에서 직접 공급되는 원사를 적용할 수도 있는 것이다.Yarns in the devices shown are illustrated as wound in bobbins, but yarns supplied directly from the spinning device may be applied.

본 발명은 열수축성, 열연화성, 융점 등과 같은 열적특성이 상이한 모든 종류의 원사 조합에 적용할 수 있으며, 동종의 원사조합이거나 이종의 원사조합도 모두 적용가능하다. 예를 들어 열적특성의 서로 다른 합성섬유의 조합, 열적특성이 서로 다른 합성섬유와 천연섬유의 조합 등을 적용할 수 있다. 특히, 본 발명은 서로 다른 열적특성을 갖는 폴리에스테르계 섬유 조합에 효과적으로 적용할 수 있다.The present invention can be applied to all kinds of yarn combinations having different thermal properties such as heat shrinkability, heat softening property, melting point, etc., and all kinds of yarn combinations or heterogeneous yarn combinations are applicable. For example, a combination of synthetic fibers having different thermal properties, a combination of synthetic fibers and natural fibers having different thermal properties, and the like may be applied. In particular, the present invention can be effectively applied to polyester fiber combinations having different thermal properties.

예를 들어 복합가연시 섬유의 열처리는 고열처리용 폴리에스테르 섬유의 경우 195∼200℃, 캐치온 가염형 폴리에스테르 섬유의 경우 175∼180℃, 나일론 섬유의 경우 160∼165℃, 폴리트리메틸렌테레프탈레이트(PTT) 섬유의 경우 이보다 훨씬 낮은 150∼155℃에서 수행된다. 따라서 이러한 섬유들을 조합하여 복합가연하기 위해서는 열처리 영역이 다른 2대 이상의 장치가 필요하게 되나 본 발명에 의하면 하나의 장치에서 동시에 복합가연을 수행할 수 있게 된다.For example, the heat treatment of the fiber during composite combustion is 195 to 200 ° C. for high heat treatment polyester fiber, 175 to 180 ° C. for cationic salt type polyester fiber, 160 to 165 ° C. for nylon fiber and polytrimethylene tere. Phthalate (PTT) fibers are carried out at much lower temperatures from 150 to 155 ° C. Therefore, two or more devices having different heat treatment areas are required in order to perform composite combustion by combining these fibers, but according to the present invention, multiple combustion can be performed simultaneously in one device.

이상 설명한 바와 같이 본 발명에 의하면 장치의 간단한 설계변경으로 단일장치에서 열적특성이 상이한 조합의 원사로부터 이색조 복합가연사를 향상된 생산성으로 제조하는 것이 가능하게 된다.As described above, according to the present invention, it is possible to manufacture the dichroic composite twisted yarn with improved productivity from a combination of yarns having different thermal characteristics in a single device by a simple design change of the device.

Claims (2)

열적특성이 서로 다른 2이상의 원사를 사용하여 이색조의 불규칙 복합가연사를 제조하는 방법에 있어서, 서로 다른 온도의 2 이상의 열처리 영역을 갖는 단일 열처리 수단에서 각각의 원사를 이에 부합하는 온도의 열처리 영역을 통과시켜 동시에 열처리한 후에 가연하고 공기교락하는 것을 특징으로 하는 이색조 복합가연사의 제조방법.In a method of producing irregular composite twisted yarn of dichroic color using two or more yarns having different thermal properties, each yarn passes through a heat treatment zone at a temperature corresponding thereto in a single heat treatment means having two or more heat treatment zones at different temperatures. Method of producing a dichroic composite composite twisted yarn characterized in that it is combustible and air entangled after heat treatment at the same time. 열적특성이 서로 다른 2이상의 원사를 사용하여 이색조의 불규칙 복합가연사를 제조하기 위한 장치에 있어서, 서로 다른 온도의 2 이상의 열처리 영역을 갖는 단일 열처리 수단과, 상기 열처리 수단 하류에 열처리된 원사를 가연하기 위한 가연수단과, 상기 가연수단 하류에 공기교락수단이 구성되는 것을 특징으로 하는 이색조 복합가연사 제조장치.An apparatus for producing irregular composite twisted yarns of dichroic color using two or more yarns having different thermal characteristics, the apparatus comprising: a single heat treatment means having two or more heat treatment areas of different temperatures, and a method of combusting yarns heat-treated downstream of the heat treatment means. Combination means for, and a dichroic composite twisted yarn manufacturing apparatus, characterized in that the air interlocking means is configured downstream of the combustion means.
KR1020010055565A 2001-09-10 2001-09-10 Method and Apparatus for producing twisted composite yarn with different tones KR20030021967A (en)

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Publication number Priority date Publication date Assignee Title
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KR0132399B1 (en) * 1993-11-22 1998-04-16 하기주 Process for manufacturing a polyester mixed yarn made by high and low shrinkage fiber
KR19980013899A (en) * 1996-08-05 1998-05-15 이웅열 Production method of shrink-fused polyester yarn for knitted polyester
JPH10317236A (en) * 1997-05-16 1998-12-02 Toray Ind Inc Production of crimped yarn
KR100236267B1 (en) * 1993-12-21 1999-12-15 구광시 Process for mixed yarn having different shrinkage

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Publication number Priority date Publication date Assignee Title
KR0132399B1 (en) * 1993-11-22 1998-04-16 하기주 Process for manufacturing a polyester mixed yarn made by high and low shrinkage fiber
KR0130633B1 (en) * 1993-12-03 1998-04-08 하기주 Process for preparing polyester mixed yarn of different shringkage
KR100236267B1 (en) * 1993-12-21 1999-12-15 구광시 Process for mixed yarn having different shrinkage
KR19980013899A (en) * 1996-08-05 1998-05-15 이웅열 Production method of shrink-fused polyester yarn for knitted polyester
JPH10317236A (en) * 1997-05-16 1998-12-02 Toray Ind Inc Production of crimped yarn

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200046469A (en) * 2018-10-24 2020-05-07 최만식 Apparatus and Method for producing twisted composite yarn

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