Method for producing chopped fibre strands

A process for preparing chopped fibre strands consists of : wetting a continuous, unsized fibre two with a liquid consisting of a volatile sizing agent; chopping the two while it is still wet into predetermined lengths; and exposing the chopped fibres to conditions of temperature and pressure to remove the sizing agent by volatilization. ..

Effects of filament modulus and linear density on the properties of air-jet textured yarns

The effect of filament initial modulus on texture yarn properties is studied, keeping other parameters constant. Initial modulus has a major influence on textured yarn properties. An increased initial modulus causes poor texturizability and therefore inferior textured yarn properties such as poor bulk, stability, loop frequency, and highe..

Loading on self-twisted yarns

The effects of different loadings on the self-twisting roller on the physical properties of self-twisted yarn were examined. The parameters measured included yarn lea strength, hairiness, evenness, strand twist, ply tiwst, diameter and abrasion resistance. The study led to the recommendation that a loading of about 300g should be applied ..

이축 회전하에서의 면사의 피로 거동

랩 각도와 적용 하중이 면사의 피로 거동에 미치는 영향을 연구하였다. 그 결과 실의 번수와 랩 각도에 관계없이 적용 하중이 20-40 그램인 경우에 로우터 방적사와 코어 방적사의 피로 수명은 링 방적사의 피로 수명보다 더 긴것으로 나타났다. 일정 랩 각도애서 적용 하중이 증가할수록 모든 실의 피로 수명은 감소하였다. 일정 적용하중에서 랩 각도가 증가하면, ..

면 커버 면/폴리에스테르사의 물성 비교

본고에서는 세가지 정방방식에 의해 면 커버 면/폴리에스테르사를 제조한 후, 이 실을 위사로 하여 제직한 데님 직물의 물성을 평가하였다. 탠덤 방적사의 절단 신도는 100％ 면 링 방적사, 필라멘트 코어의 링 방적사 및 스테이플 코어의 마찰 방적사의 그것보다 높게 나타났으며, 초기 인장 모듈러스는 낮게 나타났다. 스테이플 코어의 마찰 방적사는 평균 절단신..

Hot intermingling produces fluff-free yarns

Hoechst AG of Germnay has developed a technique for creating smooth and cohesive, fluff-free, high modulus multifilament yarns. The process involves intermingling yarns at a temperature of (0.25-0.9) Tm where Tm is the melting point or decomposition temperature of the high modulus monofilament in ℃. The average entanglement spacing of th..

The optimized conditions for friction disc falsetwist yarn texturing

Before further development of false-twist yarn texturing machines, the potential functions of the original texturing machine have to be understood. The optimization of yarn texturing conditions is not only for fully utilizing the existing texturing machine, but also for renewing the whole facility by modifying its part or changing them wi..

Formation of neps in air-jet texturing using a central composite design

Nep formation, a drawback in the air-jet texturing process, can be controlled to some extent by suitable choices of certain factors related to the process. In order to understand how these variables influence nep formation in air-jet texturing, a central composite design is formulated and four variables-air pressure, texturing speed, mech..

Hairiness of yarns from microfibres

The hairiness of nylon and polyester microfibre yarns produced by ring and open-end spinning is compared. Results show that the rotor-spun microfibre yarns are less hairy than ring-spun microfibre yarns and decreases with the linear density of the microfibres. An increase in twist reduces the hairiness of ring-spun microfibre yarns, but h..

Effect of the geometrical properties of fibres on their distribution in the yarn cross section

The fibre distribution over the cross section of spun yarns consisting of a blend of wool, polyester, acrylic and viscose rayon fibres, where the wool and acrylic fibres have a constant length but the length of the polyester and viscose rayon is varied, is investigated. It is shown that fibre migration is determined by the length and diam..