Simulating the Flow Dynamics in Hydroentangling Nozzles: Effect of Cone Angle and Nozzle Aspect Ratio

Flow behavior in various nozzle shapes from the hydroentangling cone-capillary family is modeled in this paper. The work studies the effects of cone angle and nozzle aspect ratio (the ratio of the capillary section to its diameter) on water-jet formation. In particular, two sets of nozzles are considered. The first set consists of nozzles..

Removing Pectin and Lignin During Chemical Processing of Hemp for Textile Applications

Pectin and lignin are both very important noncellulosic substances occurring in hemp fibers. The main task in preparing hemp fibers for textile applications is to remove these noncellulosic substances without damage to the fiber cellulose. Pectin and lignin in hemp before and after chemical processing are characterized by infrared spectro..

Simulating Anisotropic Woven Fabric Deformation with a New Particle Model

This paper reports the development of a new particle model to simulate fabric mechan ical behavior. A particle model of square meshes, which is close to the orthotropic structure of a woven fabric, is used to represent the fabric. In addition to the separation, bending, and shearing springs, a twist spring is introduced into the particle ..

A Class of Stripe-Free Color and Weave Effects

Repeat diagrams for,color and wea e effects in two colors that have both colors in every row and column can be obtained from weave diagrams representing one fabric laid on top of another. A very simple relation is found between the fabric layer in which a thread will occur in such a weave diagram and the color that has to be assigned to i..

An Infrared Technique for Rapid Analysis of Ramie-Acrylic Blends

An analysis of ramie-acrylic blends of different blend compositions is reported using an infrared technique. Blend estimations are made from a calibration plot between the absorption of the 2235 cm-1 band (C≡N) and the composition percentages of acrylic fibers.

Determining the Surface Free Energy of Cellulose Materials with the Powder Contact Angle Method

Different treatment processes such as alkaline washing, bleaching, and slack-mercer ization are used to improve the sorption characteristics of cellulose fibers. The differences between the sorption properties of cellulose fibers are measured with tensiometry, and their sorption velocities are measured with liquids of different polarities..

PROP 65 & CPSC

안녕하세요 P.U.코팅된 원단으로 옷을 만들어 미국 L.A.로 수출하는 봉재 업체입니다. 바이어가 이번에 저희 원단에 대하여 PROP 65  규정과 CPSC  규정에 합당한 원단인지를 물어 봅니다.  인터넷 뒤지니 규정이라기 보다는 권장사항이라고 하던데요.. 현재 유럽과 미주에 수출하는 PU 원단 공장에 물어 보아도 이 규정을 잘 모르고 있네요. 그래서 이것을 테스트 ..

Matching Weave and Color with the Help of Evolution Algorithms

Fabric design has always been a matter of inspiration, depending mostly on human ingenuity and creativity. We suggest creation of fabric patterns using evolution algorithms, which not only help to improve designs but also make the procedure semi-automatic, meaning much less dependent on designers. Evolution algorithm software offers a wid..

Torsional and Bending Analysis of Fibers with a Generalized Cardioid-Shaped Cross Section

Closed form solutions for torsional rigidity and the torsional shape factor for fibers whose cross section is a generalized cardioid are obtained. Complex variable techniques are used to solve the torsional problem, and a conformal mapping function is derived using the method of successive approximation. Closed form solutions for bending ..

Forming Random Nonwoven Webs with the Static Method

This study is about random fiber arrangements of the roller card in nonwovens processed by different voltages and electrode panel shapes. Samples are hot pressed, then photographed by a microscope. According to the results, changing the shape of the electrode panel can provide better random effects when the same voltage is used. The resul..