Deformation Analysis of 3D Braided Structural Composites

A nonlinear finite element technique is used to simulate and analyze the deformation behavior of 3D braided composites. The finite element displacement formula is derived from the geometric nonlinear behavior of braided composites. The integral relevant to the element stiffness matrix is simplified by selecting a 20-node hexahedral solid ..

Friction of Cotton Yarn in Relation to Fluff Formation on Circular Knitting Machines

The problem of fluff formation on circular knitting machines from spun yarns like cotton is investigated in order to study the amount of fluff with respect to knitting conditions, including yam tension, yam feeding speed, and angle. A novel test-rig is designed to measure tension variation and the extent of fluff generation. The results d..

Experimental Study of a High Drafting System in Cotton Spinning

Using high drafting on a sliver-to-yarn ring spinning frame requires. some critical conditions. In order to understand what occurs during this process, an experimental design is used, and the most influential parameters and their interactions are determined. This approach is applied to spinning of thick and medium cotton yarns for denim f..

Dynamic Control of a Cross-Lapper

In the textile industry, a cross-lapper is used to produce uniform layers of fibers with suitable widths and thicknesses. In this paper, first, Hamilton's principle is used to formulate a mathematical model of a cross-lapper, then the nonlinear model is linearized to get is corresponding open loop transfer function. Next, the root-locus t..

Phosphorylation of Cellulose with Some Phosphonic Acid Derivatives

Cellulose is readily phosphorylated with phosphonic acid derivatives upon heating at elevated temperatures. In this paper, various properties of cotton fabrics phosphorylated with 1-hydroxyethylidene-1,1-diphosphonic acid, phenyl phosphonic acid, 2-carboxyeth ylphosphonic acid. and N-(phosphonomethyl)iminodiacetic acid are investigated. P..

Effect of Cooling Rate on Freezing of Wool-Water Mixtures

The effect of the cooling rate on freezing of a wool-water system is studied using Dsc at cooling rates (CR) that vary from 1.25 to 40 K/min. By means of centrifugation, an equilibrium quantity of interstitial water in the fibers (Ws ) is determined to be 0.48 g/g of wool. Two samples with different water contents are used: sample A is mo..

Retting Flax with Endopolygalacturonase from Rhizopus oryzae

Retting, which is the process of separating fibers from nonfiber tissues in bast plants, is the major problem in processing flax for linen, and new methods, especially enzyme retting, are being pursued to overcome this problem. Production of an endopolygalact uronase (EPG) from Rhizopus oryzae, which was isolated earllir from dew retted f..

『현장기술인력재교육사업』관련 “온라인 화상교육” 실시 안내

『현장기술인력재교육사업』관련 “온라인 화상교육”실시 안내 본소에서는 지식경제부 후원 및 산업기술진흥원(KIAT) 전담의 현장인력재교육사업으로 “Pilot 방직설비를 활용한 면방 중견기술자 재교육 사업”(사업기간 : 2011. 11.1～2012. 6.30, 8개월)을 추진하고 있습니다. 이와 관련하여 본소에서는 KIAT의 온라인 교육시스템을 이용하여, 집체교육시 교육을 ..

REACH SVHC 대응 문의

안녕하십니까. REACH SVHC 물질 대응간 질문이 있어 문의드립니다. 저희는 화학 약품(혼압)을 제조하여, 고객사에 납품을 실시하는데, 고객사에서, SVHC 함유여부를 확인하고자, 저희쪽에 보증서를 작성해 달라고 했습니다. 이에, 그 제품에 포함되어 있는, 각 원재료 업체에 연락을 하여, SVHC 함유여부를 확인하여, 보증을 실시하는데, 단순혼합(Ex. 인산, 질산, ..

Morphology Gradients in Thermally Point-Bonded Poly(ethylene Terephthalate) Nonwovens

In a previous article, a sharp change in the birefringence and density of polypropylene fibers was reported at the edge of thermal point bonds in nonwovens. In this article, similar results are shown for polyester nonwovens. First, in both isotactic polypropylene (ipp) and poly(ethylene terephthalate) (PET), the morphology of the fibers b..