• 한국의류산업학회지
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• 제8권3호
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• pp.363-369
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• 2006

In this the study, Lyocell fabrics for blanket were developed to get high value added goods for elder and Infant. Therefore, the purpose of the study was determine the effect of twist per inch on the physical properties of developed fabrics, including compression property and abrasion resistance on the process for making Lyocell combined yarns. For comparison, commonly used cotton blanket was used. The results were as the follows: 1) Dimensional changes of Lyocell fabrics was in -3% which value was pretty stable, and antistatic property was very good with 10V of electric propensity voltage which means there was no static electricity at all. Pilling property of Lyocell fabrics showed 3 grade which was good and air permeability and moisture vapor transmission rate of Lyocell fabrics were higher than those of cotton fabric and keeping warmth rate of Lyocell fabrics was about 50% which means it very warms. 2) Twist per inch of Lyocell combined yarns increased with tensile strength and elongation of Lyocell fabrics. 3) Twist per inch of Lyocell combined yarns increased with decreasing thickness reduction rate and therefore, compression property of those was pretty good. Specially, compression property of Lyocell fabrics made with yarns of 3.9TPI was better than those of cotton fabric. 4) Twist per inch of Lyocell combined yarns increased with abrasion resistance of Lyocell fabrics.

• 패션비즈니스
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• 제12권6호
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• pp.46-60
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• 2008

Lyocell is a regenerated cellulosic fiber manufactured by an environmentally friendly process. The major advantages of lyocell are the excellent drape forming property, the genuine bulkiness, smooth surface, and high dry/wet tenacities. However, one drawback of lyocell is its fibrillation property, which would degrade its aesthetic quality and lower the consumer satisfaction. In our previous studies, lyocell was treated with epichlorohydrin, a non-formalin based crosslinker, to reduce its fibrillation tendency. To investigate the changes of physical properties upon ECH-treatment, the hand characteristics of ECH-treated fabric were observed using KES-FB system and the 3D-virtual sewing image of the fabrics were obtained using 3D CAD simulation system in this study. Since epichlorohydrin(ECH) treatment was conducted in the alkaline medium, the weight reduction was observed in all treated lyocell. The treated lyocell became light, smooth and flexible in spite of ECH crosslinker application. LT and RT in tensile property upon the ECH treatment did not change significantly, however, EMT and WT in the tensile property increased. The significant decrease in bending rigidity was resulted in all ECH-treated lyocell, which is the result of the weight loss upon the alkali condition of ECH treatment. The bending rigidity increased again in the ECH 30% treated lyocell, however, the B value is still lower than the original. Therefore, the ECH-treated lyocell would be more stretchable and softer than the original. Shear rigidity was also decreased in all ECH-treated lyocell, which would result in more drape and body fitting when it is made as a garment. The ECH-treated fabric showed the softer smoother surface according to SMD value from KES evaluation. The virtual 3D sewing image of the ECH-treated lyocell did not show a significant change from that of the original except ECH 30% treated lyocell. ECH 30% treated lyocell showed a stiffer and more puckered image than the original.

• 한국연초학회지
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• 제22권1호
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• pp.99-106
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• 2000

In order to investigate the applicability of lyocell fiber to filter paper, papper sheets were manufactured with the addition of lyocell fibers in various length(1.5 denier: 2, 3, 4mm) and content(10, 30, 50%) and their physical characters, such as fibrilation rate, adsorption efficiency of methylene blue(MB), paper formation, and crimping ability, etc, were tested. The level of main fibrilation from lyocell fiber was higher in wet beating process than that in free beating because of the higher strength of lyocell fiber compared with wood fiber. Fibrilation could be observed at the degree of beating over 30$^{\circ}$ SR in wet beating with Valley beater. The air permeability and tear factor of the paper increased and the paper formation index decreased according to the increase of fiber length. The weak binding force of lyocell fiber in spite of its higher fiber strength, might be a limitng factor in addition of lyocell fiber to the natural wood pulp in manufacturing the paper having the needed physical properties. High contents of wood pulp decreased air permeability, the breaking length, tear factor, the bursting strength, and paper formation index in paper sheets. As the contents of lyocell increased from 10% to 100%, the adsorption efficiency of MB was elevated to 1.7-7.9 times compared with that in 100% wood pulp. But the length of lyocell fiber did not affect the MB adsorption.

• 한국의류학회지
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• 제30권12호
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• pp.1683-1689
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• 2006

리오셀직물은 면직물보다 강하고 습윤시 치수안정성이 높으며 우수한 드레이프성, 탁월한 광택, 소프트한 촉감 등 우수한 성능을 가지고 있어 최근 각광받고 있는 신소재 중 하나이다. 그러나 리오셀직물에 관한 연구는 섬유의 성질, 가공염색방법에 관한 것이 대부분으로, 적합한 봉제방법, 심지선정 등에 관한 연구는 찾아보기 어렵다. 이에 본 연구에서는 겉감으로 시판 리오셀직물 중 숙녀복 수트용으로 사용되고 있는 100% 텐셀직물과 65/35% 텐셀/면 혼방직물 각각에 대해 20수와 10수 모두 4종류를 선정하고 접착 심지로는 중량과 조직을 달리하는 시판 직물심지 5종류와 부직포심지 1종류를 선정하여, 리오셀 심지접착포의 접착심지와 리오셀겉감의 특성에 따른 외관적 성능과 역학적 특성을 측정한 후, 통계적 분석(t-검정, F-검정)에 의해 검정하여 다음과 같은 결론을 얻었다. 1. 리오셀 심지접착포의 드레이프성과 구김회복성은 접착심지의 구조에 영향을 받고, 강연성은 접착심지의 구조와 리오셀겉감을 구성하는 실의 변수에 영향을 받는다. 2. 리오셀 신지접착포의 인장특성중 WT는 리오셀겉감을 구성하는 실의 번수와 혼용률에 영향을 받고, RT는 리오셀 겉감을 구성하는 실의 번수에 영향을 받는다.

• 한국의류산업학회지
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• 제1권1호
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• pp.56-61
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• 1999

Swelling and fibrillation of two kinds of lyocell, $Tencel^{(R)}$ and $Lyocell^{(R)}$, were investigated using polarizing and scanning electron microscope (SEM). $Tencel^{(R)}$ of a representative lyocell showed that loop tenacity which is related to wrinkle and resilience of fiber does not show significant reduction in wet state. Two kinds of lyocell exhibited surprising degree of swelling in aqueous NaOH solution under free tension. Diameters of $Tencel^{(R)}$ and $Lyocell^{(R)}$ swelled up to 670% and 830%, respectively in the range of around 10% NaOH concentration. Molecular orientation estimated by birefringence also reduced remarkably in alkaline solution. Moreover, diameter and birefringence which changed in alkaline solution did not recovered to original level even after washing and drying. Fibrillation of $Lyocell^{(R)}$ fiber observed by SEM seems to be easier than that of $Tencel^{(R)}$. In order to understand the difference between $Tencel^{(R)}$ and $LyoceJl^{(R)}$, further study on the structure of the two fibers will be followed.

• 한국염색가공학회지
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• 제18권4호
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• pp.20-27
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• 2006

Lyocell is a not only environmentally-friendly but also very advantageous fiber. When Lyocell is soaked in water, its wet tenacity does not decrease and elongation and moisture regain of it are better than cotton. However, one drawback of lyocell is its fibrillation. The fibrills of lyocell were generated during wet process such as scouring and dyeing deteriorates the dyeing color depth and the appearance of fabric. The purpose of this study was to decrease the fibrillation tendency of lyocell fabric using crosslinking agent, epichlorohydrine(ECH). The effects of NaOH scouring and ECH crosslinking were observed. The different types of ECH addition methods to lyocell and the various concentrations of ECH in crosslinking reaction onto dyeing characteristic and fibriallation were investigated. Weight loss and whiteness index of crosslinked lyocell by ECH were examined. K/S values of ECH treated lyocell fabrics dyed with reactive dye were measured and SEM images of untreated and treated lyocells were observed extensively to define the fibrillation tendency. The results were as follows ; 1) ECH treatment showed the effect of weight loss and scouring because ECH crosslinking reaction was conducted in alkaline condition. 2) The increase in ECH concentration from 5 to 30% does not affected K/S value changes. 3) ECH crosslinking can effectively prevent the fibrillation tendency of lyocell.

• 대한가정학회지
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• 제37권12호
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• pp.169-177
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• 1999

This study has examined weight loss rates of Iyoceu, lyocell/cotton, cotton that were treated with cellulase under different concentration, time, temperature and pH. and compared physical properties changes of tensile strength, drape, moisture absorbency, shrinkage and dyeability. The notable results are summarized as follows: Lyocell was in need of pretreatment by NaOH in the side of weight loss, tensile strength and dyeability. Weight loss rates of cellulose fabrics by cellulase treatment were in the order of cotton > lyocell/cotton > lyocell at the same conditions. In case of lyocell and lyocell/cotton, weight loss rates showed up lower than cotton, while strength retention decreased, drape and strength flexibility were highly improved after cellulase treatment.

• 대한가정학회지
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• 제40권7호
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• pp.15-24
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• 2002

In this work, the effect of fusible interlining on the appearance related properties and mechanical characteristics of Lyocell fabric after fusing was investigated. Two different types(20's and 10's) of Lyocell face fabric with six different interlining(by thickness and structure) for earth Lyocell fabric were examined. In order to establish the optimum fusing condition for the different face fabric and interlining, peel strength of each fused fabric was measured, which was dependent on the fusing temperature, pressure, and time. The characteristics related appearance and mechanical characteristics of each fused fabric were determined. The results are as follows: The peel strength was excellent, when the fabric was fused with the force of 3kgf/$textrm{cm}^2$ at $120^{\circ}C$ for 15seconds. Flex stiffness, G, 2HG, 2HG5(shear), B, 2HB(bending) of 100% Lyocell fabric 10's were higher than those of 100% Lyocell 20's. Flex stiffness, crease recovery, G, 2HG, B, 2HB of thicker woven interlining were higher than those of thinner woven interlining. Crease recovery of twill interlining were higher than those of plain interlining. In case of shear and bending properties, however, plain interlining was higher than twill interlining. Flex stiffness, crease recovery, G, 2HG, 2HG5, B, 2HB of nonwoven interlining were higher than those of woven interlining. In case of drapability, however, woven interlining was higher than nonwoven interlining.

• 폴리머
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• 제31권3호
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• pp.221-227
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• 2007

폴리(비닐 알코올)(poly(vinyl alcohol), PVA)을 충전제로 사용하여 용액 블렌딩 방법을 통해 라이오셀(Lyocell) 블렌드 필름을 만들고 각각의 기계적 성질과 모폴로지를 비교했다. 각 블렌드 필름의 물성들은 첨가된 PVA 양에 따라 다양하게 변하였다. 특히 라이오셀 중에서 30 wt%의 PVA를 포함하는 블렌드(PVA/Lyocell (w/w=30/70)) 필름의 최대 인장 강도가 가장 높은 값을 나타냈으며 40 wt%가 되면 오히려 감소했다. 초기 탄성률 값에서도 비슷한 결과를 보였는데, 역시 30 wt%의 PVA가 포함된 필름이 가장 높은 초기탄성률을 보였다. 유기화 점토인 도데실트리페닐포스포늄-마이카($C_{12}PPh$-Mica)를 이용하여 PVA가 30wt% 포함된 블렌드된 라이오셀 나노복합체 필름을 용액 Intercalation 법을 이용하여 제조한 후에 각 나노복합체 필름의 기계적 성질을 유기화 점토의 양에 따라 조사하였다. 순수한 라이오셀의 경우에는 기계적 성질이 5 wt% 점토를 첨가했을 때 가장 높은 값을 가졌으며, 소량의 점토만으로도 순수한 라이오셀보다 높은 기계적 성질을 나타내었다. 그러나 PVA를 포함한 라이오셀 블렌드(PVA/Lyocell(w/w=30/70))의 나노복합체 필름의 경우에는 유기화점토의 첨가된 양이 1에서 5wt%까지 증가해도 기계적 물성은 오히려 일정하게 감소하였다.

• 한국의류학회지
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• 제30권8호
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• pp.1323-1332
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• 2006

Lyocell is a regenerated cellulose fiber manufactured by an environmentally-friendly process. Since the fiber has more crystalline region compared to rayon, lyocell shows higher wet-strength than rayon. Although fibril generation of lyocell is lower than that of rayon because of the reason, the fibril generated during the wet process deteriorates the smooth look and soft touch of the fabric. The efficient way to remove the fibril yet retain the strength property was investigated in this work. In order to scour and remove the fibril from the fabric, cellulase enzymes were introduced and the traditional scouring was carried to be compared. Weight loss, dye-ability, and strength of treated fabric were measured after the treatments. Scanning electron microscopy was used to observe the surface of the fiber. Among the cellulases used in this work, Denimax 992L showed the best results for removal of fibril with low weight loss and tensile strength loss. The optimal conditions for the enzymatic treatment could be chosen depending on a characteristic for final purpose of the lyocell product.