FYI Tester Instrument

  Aromatic polyamide fibers are fibers composed of linear macromolecules formed by aromatic groups linked by amide or imide bonds. At least 85% of the amide or imide bonds are directly connected to two aromatic rings, and when imide bonds are present, their percentage does not exceed that of amide bonds. Based on the substitution position of the aromatic groups, aromatic polyamide fibers are further divided into para-aramid fibers and meta-aramid fibers. Para-aramid fibers have a linear molecular chain arrangement; a typical product is poly(p-phenylene terephthalamide) fiber, abbreviated as para-aramid (also known as aramid 1414 in my country). Meta-aramid fibers have a zigzag molecular chain arrangement; a typical product is poly(m-phenylene isophthalamide) fiber, abbreviated as meta-aramid (also known as aramid 1313 in my country). This article mainly introduces and compares the currently implemented testing standards for meta-aramid and para-aramid fibers, analyzing the differen...

Cotton inevitably contains various impurities during its natural growth, harvesting, storage, transportation, and processing due to various reasons. These impurities not only affect the quality and price of raw cotton but also significantly impact the production and economic benefits of textile mills. Therefore, several major cotton-producing and consuming countries in the world, including China, have established detailed standards for testing cotton impurity content to regulate related matters in commercial practices and scientific research. The following is a brief introduction and analysis of the standards and instruments used for measuring impurity content in cotton outside of China. Historical Development The earliest and most systematic standards for testing impurity content in cotton were proposed in the UK. In 1955, the Textile Institute organized a drafting committee comprised of researchers and industry professionals to develop standards for testing impurity content in cotton...

  A melt spinning machine consists of a combination of melting, filtering, extruding, cooling, and drawing equipment that is used to produce continuous filaments from thermoplastic polymers by a controlled process. The process is basically controlled by the melt rheology, thermal management, and molecular orientation, which are responsible for the uniformity of the filament and eventual mechanical properties. Melt spinning begins with solid polymer feedstock and finishes with oriented fibers in package form, which can be used for further textile or industrial processing. The most important process parameters that determine process efficiency in polymer melt spinning are the stability of melt flow, the temperature zoning, and the draw ratio. Core sequence: Polymer → Melt → Filter → Spin → Cool → Draw → Wind Melt Spinning Process Polymer Preparation and Melting Moisture is removed from polymer chips during drying to prevent them from degrading molecular chains when heated. This mater...