Effect of twist on the performance of tire cord yarns

19-24<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">The effect of twist on the performance of polyethylene naphthalate, dimensionally stable polyester and high-tenacity polyester cord yarns has been studied. It is observed that the twist has a very important effect on the tensile properties, creep properties and fracture mechanism. An increase in the twist level increases breaking elongation and creep rate but decreases breaking strength. Breaking mechanisms are also affected by the twist level. However, it is found that the material has the most important role on the cord performance.</span

Effect of suture structure on knot performance of polyamide sutures^a

271-277The knot performance of monofilament and braided polyamide (PA) sutures has been characterised by applying two different knots with two, three and four throws. It is observed that generally granny knot and braided structure have better knot performance. An additional throw does not increase the force required to break the suture. Suture size is also important for knot performance and the sutures behave differently when they are wet