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Development of a pre-knitting friction test method and study of friction and bending of yarns with high stiffness.
Högskolan i Borås, Institutionen Textilhögskolan.
Högskolan i Borås, Institutionen Textilhögskolan.
2009 (engelsk)Independent thesis Advanced level (degree of Master (One Year))Oppgave
Abstract [en]

Knitting is a class of techniques for production of textile fabrics by inter-looping yarns with the use of hooked needles. The new loops are created when the yarns drawn through the previously formed loops. An apparatus for two needles with adjustable geometry resembling the knitting process in weft knitting machines has been constructed and mounted in an ordinary tensile testing machine in order to study stress build-up, fibre damage, needle wear etc. The merits of the knittability test-rig set-up are the possibilities to test the performance of the yarns with the geometry of the machine and to simulate and identify some of the problems that can occur between needles and yarn in the knitting process. Well-defined mechanical conditions with the static pre-load weight and the possibilities to identify the location of the events of damage on the fibres during the testing of the specimens and to do further examination before knitting are some obvious merits. The knittability of some extreme yarns, PET-monofilaments, carbon fibre roving and aramid yarn has been studied with respect to friction and bending stiffness. Friction and bending characteristics exhibit viscoellastic features. The needles have diameters of the same order of magnitude as the diameters of monofilaments for example for use in knitted spacer fabrics and the results of this work illustrate strong influence of the fibre diameter on the knittability.

sted, utgiver, år, opplag, sider
University of Borås/Swedish School of Textiles , 2009.
Serie
Magisteruppsats
Emneord [en]
knitting technology, carbon fibres, pet fibres, aramid fibres, flexural rigidity, friction
HSV kategori
Identifikatorer
URN: urn:nbn:se:hb:diva-19180Lokal ID: 2320/4525OAI: oai:DiVA.org:hb-19180DiVA, id: diva2:1311114
Merknad

Program: Magisterutbildning i textilteknologi

Uppsatsnivå: D

Tilgjengelig fra: 2019-04-30 Laget: 2019-04-30

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