Influence of Processing Conditions on the Microstructure and Properties of Shape Memory Polyurethane Membranes

Solution-cast films of shape memory polyurethane are investigated by Fourier trans form infrared spectroscopy, differential scanning calorimetry, dynamic mechanical anal ysis, tensile properties, water vapor permeability, and shape memory effect tests. Samples cast at higher temperatures contain more hard segments in the crystalline state..

Clothing Thermal Insulation During Sweating

Heat transfer through clothing is an important topic related to thermal comfort in environmental engineering and functional clothing design. The total heat transmitted through clothing is commonly considered as the sum of the dry heat transfer and the evaporative heat transfer. Clothing thermal insulation measured in a nonperspiring con d..

Evaluating Wool Shirt Comfort with Wear Trials and the Forearm Test

The comfort of light-weight woven fabrics in the form of next-to-skin clothing is investigated by wear trials and the forearm test. The wear trial in neutral environmental conditions shows that light-weight wool and wool blend fabrics are generally less comfortable than the summer polyester, cotton poplin, and polyester/cotton, fabrics te..

Backscattering of Light in Determining Fiber Orientation Distribution and Area Density of Nonwoven Fabrics

The behavior of light backscattering from a fiber assembly with arbitrairy fiber orien tation distribution in space and area density depends on the physical properties of the fibers and their arrangement in the fiber assembly. In this paper, a thin fiber layer and its overlapped models are built to study their relations. With this model, ..

Mechanics of Disk-Type False Twisting Part I: Yarn Path and Friction Force on a Single Disk

False twisting by means of a friction disk unit is an efficient technology used worldwide to manufacture synthetic fiber yarns that are textured. This paper proposes a new theory to analyze the yam path and the friction force exerted on the running yarn over a single friction disk. We do not apply discrete methods, but treat the system in..

Hydrolytic Degradation of Nylon 66 Pile Carpet Fibers

Hydrolytic degradation of nylon 66 fibers for sculpturing pile carpets is investigated in this study. Applying an aqueous solution of para-toluenesulfonic acid catalyzes the hydrolysis of nylon 66 and degrades the fibers. The reduced strength of the fibers enables sculpturing of pile carpets. The morphology of the degraded fiber tips is r..

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안녕하세요. 저희 KOTITI  홈페이지를 이용해 주셔서 감사합니다. Q1) ISO 는 왜 산성과 알칼리성으로 나눠 시험을 하는지 ?    -  인체 땀을 분석한 결과 산성과 알칼리성 땀액으로 나누어 진다고 합니다.           그래서, 시험을 인공 땀액(산성 알칼리성)으로 만들어 시험하도록 규정되어 있습니다. Q2) AATCC는 왜 알칼리성은 시험하지 않는지?    -  가능은..

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