Composite thread containing metal-plated yarns and warp-knit fabric thereof

[0063] In Example 1, the antibacterial property and the electro-magnetic shielding property were tested on warp-knit fabrics formed of composite threads according to the present invention.

[0064] A composite thread was obtained from a silver-plated yarn (X-Static.RTM.) of 30XS10 type available from Sauquoit Co., the United States (formed of polyamide multifilament 30 d / 10 f which is plated with silver to become 40 d thick) used as an inlay yarn and a polyacrylic multifilament yarn (Pewlon.RTM.) available from Asahi Kasei K. K. used as a chain stitch yarn. A net warp-knit fabric (a complete structure thereof is defined by twelve courses) shown in FIG. 4 was formed while using this composite thread as yarns 31 an 33 and a polyamide filament yarn as yarns 11, 12, 13 and 21, 22, 23. A ratio of the silver-plated yarns in the warp-knit fabric was 2% by weight.

[0065] The resultant net warp-knit fabric was dyed under the following conditions:

[0066] The polyamide multifilament yarn was dyed wi

[0078] In Example 2, the electro-magnetic shielding property was tested on a warp-knit fabric according to the present invention wherein a metal-plated yarn is directly inserted as an inlay yarn.

[0079] A warp-knit fabric shown in FIG. 6 was prepared by using a 28G warp knit machine from a polyamide multifilament yarn of 40 d / 10 f used as dyeable yarns 61 to 66 and a silver-plated yarn (X-Static.RTM.) of 30XS10 type available from Sauquoit Co., the United States (formed of polyamide multifilament 30 d / 10 f which is plated with silver to be a thickness of 40 d) used as an inlay yarn. A basis weight of the resultant warp-knit fabric was approximately 60 g / m.sup.2; a weight of the metal-plated yarn in the warp-knit fabric was approximately 20%, i.e., 12 g / m.sup.2; and a size of a maximum perforation was approximately 3 mm.

[0080] The electro-magnetic shielding property in the range from 1 to 1000 MHZ was measured using the resultant warp-knit fabric in accordance with a KEC method.

[0084] In Example 3, the electro-magnetic shielding property was tested on a net warp-knit fabric according to the present invention wherein the composite thread is used as an inlay yarn and which is embroidered with an embroidery thread.

[0085] A warp-knit fabric shown in FIG. 7 was prepared, using a 20G warp knit machine, from a polyamide multifilament yarn of 30 d / 10 f used as dyeable yarns 81 to 86, a covering yarn formed of a polyurethane core yarn of 140 d around which is wound a polyamide multifilament yarn of 50 d / f used as elastomeric yarns 91 to 96, and a composite thread formed of a chain stitch yarn of polyamide multifilament of 70 d / 24 f inserted with the above-mentioned silver-plated yarn (X-Static.RTM.) of 30XS10 type available from Sauquoit Co., the United States (formed of polyamide multifilament 30 d / 10 f which is plated with silver to become 40 d thick) used as inlay yarns A1 to A3 and B1 to B3. A basis weight of the resultant warp-knit fabric was 210 g / m.su