An Rye Lee

Preparation and characterization of melamine-formaldehyde microcapsules containing Citrus unshiu essential oil

Melamine-formaldehyde microcapsules containing essential oil form Citrus Unshiu fruit as a natural functional compound were prepared by different stirring speeds. Chemical component, surface morphology, particle size, thermal properties, and release behavior were investigated to characterize the microcapsules and cotton knit was treated with the microcapsules to test their durability to washing. As results, the microcapsules were verified as containing the oil as core material with 80 % of loading capacity and as having more even and smaller size by 7000 rpm. Release behavior of the microcapsules showed few leakage of the oil at normal condition. Finally, the microcapsules were successfully added to cotton fabric even though durability to washing was not sufficiently acceptable. These results suggested that utilization of microcapsules containing Citrus unshiu oil as a bio-functional medium to textiles needs to be explored by optimizing finish process in a future work.

Investigating Performance of Cotton and Lyocell Knit Treated with Microcapsules Containing Citrus unshiu Oil

This study was carried out to evaluate performances of cotton and lyocell knit treated with microcapsules of Citrus unshiu essential oil (MIC-CUEO) with regard to varied amounts of microcapsule and binder. Two different knits (cotton 100 % and lyocell 100 %) were respectively treated with prepared MIC-CUEO under four different concentrations of microcapsule and an acrylic binder. Surface morphology by SEM and weight add-on percentages were investigated. Mechanical properties by Kawabata Evaluation System (KES) and comfort attributes such as moisture regain, water absorption, water vapor permeability, and air permeability were assessed. Release behavior over time was evaluated depending on laundering repetition. As results, the both knits were found as stiffer and less puff slightly after MIC-CUEO treatment. Due to additive components such as binder and microcapsules, hygroscopicity and water transportation were slightly debased overall as well as air permeability, which was however assumed as not significant to affect wearer’s comfort. Even though the treated knits didn’t seem to release the oil much under every condition, 7-5 combination of microcapsule and an acrylic binder was thought to retain the oil the most on both cotton and lyocell. In a future work, biological and sensory functions should be discussed for MIC-CUEO treated knits.

Bioactive properties of Citrus unshiu’s essential oil for its application to textiles

This study was aimed to analyze chemical components of essential oil from whole fruits of Citrus unshiu and its fragrance and to investigate its bio-functions as a skin-health finishing agent to textiles. The components of oil and fragrance were respectively determined by using both FT-IR and GC-MS. As for bioactive properties, the skin irritancy from oil was assessed by Kawai’s method and antimicrobial activity was evaluated by MIC (minimum inhibitory concentration). As results, major component of the citrus oil was identified as D1-limonene which also constituted most of its fragrance. Any skin reaction was not found by Kawai’s method, which means that the citrus oil does not cause irritancy on human skin. As for microbial activity against S. aureus, K. pneumoniae, and P. acnes, the lowest minimum inhibitory concentrations were 0.50 mg/ml, 0.28 mg/ml, and 0.23 mg/ml, respectively. These results suggest that Citrus unshiu’s essential oil could be utilized as a bioactive natural finishing agent for skin-healthcare textiles.

Dyeing Properties and Color Characteristics of Silk Fabrics Dyed with Prunus yedoensis Matsumura Flower Extract

This study was carried out to identify the optimum dyeing conditions for maximum dye uptake of Prunus yedoensis Matsumura flower extract on silk fabric and to investigate hue/tone characteristics and fastness properties of the dyed fabrics. As results, the flower extract was found to contain flavonoids by FT-IR and to show yellowish shade by UV-vis spectrum. Silk fabric was optimized for maximum dye uptake to five repetitions of dyeing at for 60 min with an extract concentration of 600% owf in terms of both K/S and color differences. Pre-mordanting was more effective to dye uptake than post-mordanting for all of the mordants used. Un-mordanted and pre-mordanted fabric showed YR(Yellow Red) while most of post-mordanted ones did Y(Yellow). Main tones of dyed fabrics were sf(soft) and lt(light) in the case of unmordanting or Al-mordanting whereas they were d(dull) and g(grayish) by post-mordanting with Cu, Cr, and Fe, respectively. The fastness grades to rub and dry cleaning were reasonably good for most dyeing conditions while those to light were poor. Finally dyeing condition for each hue/tone of the dyed silk with the flower extract was optimized considering fastness properties.

Mechanical Properties, Comfort, and Bio-Function of PLA Knits Treated with Microcapsules of Citrus Unshiu's Essential Oil

This study aimed to investigate the mechanical properties, comfort attributes such as water absorption, water-vapor permeability, as well as air permeability, fragrance release, and antimicrobial activity of PLA knits treated with microcapsules containing Citrus Unshiu`s essential oil (MIC-CUEO). As for the mechanical properties by KES, tensile and bending rigidity were slightly increased while surface roughness and compressional energy were reduced. Comfort attributes including water absorption, water-vapor permeability, and air permeability were also declined but not significant. Fragrance release rates were very, which means that the treated PLA could preserve its fragrance feasibly. Finally, lower capsule and binder concentrations such as 3% were shown to provide excellent antimicrobial activity to PLA knits even after 10 repeated launders.

Effect of Colorimetric Characteristics and Tone Combination on Color Emotion Factors of Naturally Dyed Color Combination Fabrics -Focus on Yellowish and Reddish Fabrics-

Abstract This study identified color emotion factors of naturally dyed two-color combination fabrics focused onyellowish and reddish shades to examine the relationship between color emotion factors and physical colori-metric variables (as well as tone combination groups) to provide prediction models for color emotion fac-tors of naturally dyed fabrics with a two-color combination. Each of eight different stimuli were preparedby paring two pieces of silk fabrics colored in red and yellow by natural dyeing respectively; in addition,their color emotion descriptors were evaluated by human subjects using semantic deferential scales. ‘Joyful’,‘Natural’, ‘Classical’, and ‘Soft’ were extracted as color emotion factors for the naturally dyed yellowish-reddish combination fabrics. They were found to be significantly affected by physical colorimetric variablessuch as CIE C* and L* and tone combination groups. Finally, prediction models for all color emotion fac-tors were established using physical colorimetric variables and tone combination groups that led to the con-clusion that they could be applicable to design a color combination for naturally dyed fashion fabrics.Key words: Naturally dyed color combination fabrics, Colorimetric characteristics, Tone combination,Color emotion factors; 천연염색 배색직물, 색채 특성, 톤 조합, 색채감성요인

Effect of Color and Mechanical Properties on Visual Texture of Fabrics -Focused on Digital Printing-

Abstract: The objective of this study was to invest igate whether color variables, such as CIE values and hue/tone categories, and mechanical properties influence the visual texture of fabric, and to establish prediction models for the visual texture based on both mechanical properties and color variables. A digital textile printing system was used to color six differ-ent silk and cotton fabrics. The chromatic shade value for each color was identified using a 3 × 3 matrix of hue (red, yellow, and green) or tone (pale, vivid, and grayish) , with gray as the neutral value. Mechanical properties of the fabric samples were measured using a Kawabata Evaluation System. Subjective perception of visual texture by human evaluators was obtained using modified magnitude estimation. The mechanical properties of the fab-ric samples were found to be the primary influence on variations in sensory descriptors of the visual texture. Furthermore, results showed that, while the visual texture was strongly dependent on the tones, chromatic shade, and gray, it was hardly affected by hue. Finally, these results were used to develop prediction models for visual texture based on both mechanical properties and color variables.

Interaction Effect of Mechanical Properties and Color Characteristics on the Subjective Touch and Color Sensation of Silk Fabrics

This study investigates the interaction effects of mechanical property-based clusters and colorimetric tones on the subjective touch and color sensation of fabrics when sight and touch were simultaneously provided to humans. Each of six different silk fabrics was colored by digital textile printing to have three tones (pale, vivid, and grayish) and its mechanical properties were measured by a Kawabata Evaluation System (KES). Touch and color sensation were identified to be primarily influenced by mechanical property-based clusters and tones, respectively. In touch, `smooth`, `warm`, `heavy`, and `soft` were found to be affected by interactive effects of mechanical property-based clusters and colorimetric tone so that the pale tone tended to make differences smaller among the clusters for the touch sensation, while the grayish tone seemed to contribute to larger differences of `heavy`. However, an interaction effect was not found in the color sensation with touch even though the color sensation was also influenced by mechanical property-based clusters.