Sen'i Kikai Gakkaishi (Journal of the Textile Machinery Society of Japan)

It is often to make a composite yarn for design and development of new textile products at textile industry in Japan. Covering process is one of methods in which two or more yarns are combined. And then, a composition of covering and core yarns in a covered yarn is an important factor for affecting the quality and characteristic of fabric.
Covering tension is theoretically estimated for clarifying a relationship between the composition of covering and core yarns and manufacturing condition in covering process. The covering tension increases with increasing the angular velocity of spindle and the balloon height. The composition of covering and core yarns decreases with increasing the ballooning tension.
In order to prevent the covering tension from decreasing with the change of bobbin radius for the covering yarn, a method of controlling the angular velocity of spindle has an effect for keeping a constant composition of covering and core yarns in a covered yarn.

View full abstract

Show abstractHide abstract

Non-woven fabrics or its sintered products out of metal fibers made by the coil shaving technology are applicable as low cost precision filters. In addition, application of titanium fibers as corrosion resistant electrode materials, artificial dental root and artificial bone for the regenerative medicine are expected for practical use recently.
Despite such application requires that non-woven fabrics and its sintered products to be more homogeneous and consistent fiber dispersion than usual, no studies have ever been conducted on machining conditions.
In this study, we therefore fabricated stainless steel fibers used widely for various types of filters and titanium fibers used for medical purposes, and studied machining conditions by investigating these fabricated fibers.
The results showed that there exists a roll center distance which can be scattered evenly according to the fiber equivalent diameter. It was found that when the thrust through number of needle is less than 30 needles/cm², the tension load of non-woven fabrics increases proportionately to the weight. Besides, we confirmed that for the case of the fiber equivalent diameter is equal or less than 45 um, it is possible to control weight of non-woven fabric within +/− 5%.

View full abstract

Download PDF (1110K)

Register with J-STAGE for free!