关键词: 纬编衬纬组织, 镀银纱线, 电加热针织服装, 热性能, 平衡温度

Abstract: Electrically heated knitted products can be obtained by direct knitting of conductive yarns. By selecting laid-in yarns or altering the ground weave, the weft laid-in stitch can create fabrics with various patterns. Knitted smart garments can be customized based on the weft laid-in stitch.
To discuss the application of weft laid-in stitch to electrically heated knitted garments, the silver-plated yarn is used as a laid-in yarns to produce electrically heated elements. Silver-plated yarn is incorporated into the weft-knitted fabric with polyester ground yarn at a ratio of 1:2. Three types of weft laid-in knitted fabrics with different ground structures are produced: plain laid-in stitch, rib laid-in stitch, and air-layer laid-in stitch. Analyze the fabric organization. The structure of laid-in stitch fabric is slightly tight. But the fabric is skewed severely and there are some curls on the top and bottom sides. Weft inlay stitch fabric is looser than the weft plain knit. The upper and lower edges of the fabric produce a slight curl. The air-layer laid-in stitch fabric has a tight, flat, and aesthetically pleasing structure with no curling on the sides. The results of fabric electrical heating performance testing and analysis: high heating efficiency with 3 different fabric organizational structures. Under the same power output, the plain laid-in stitch fabric shows the best heating performance, while the rib laid-in stitch fabric performs the worst among the three.
Based on comprehensive test results, the air-layer laid-in stitch with the most stable structure and excellent heating effect is selected for use as the heating element in electrically heated knitted garments. It is used as the heating part element of the electrically heated knitted garment. Design and knit an electrically heated knitted garment in conjunction with clothing pattern design. Test the thermal stability of the heating unit in different parts. The results indicate that at lower voltages, the heating units exhibit greater resistance to change. At a rated voltage of 1.0 V, the back heating unit exhibits the highest resistance change rate of 0.40, the abdominal heating unit of 0.26, and the waist heating unit of 0.18. As the rated voltage increases, the resistance change rates of the heating units gradually decrease, leading to improved resistance stability. Additionally, the heating performance of each heating element is tested under various environmental conditions. The results show that at an ambient temperature of (20±2) ℃. With rated voltage from 1.0 V to 3.5 V, the equilibrium temperature of the abdomen heating unit of the electrically heated knitwear gradually increased from 24.9 °C to 36.9 °C. The equilibrium temperature of the back heating unit is gradually increased from 25 °C to 35.9 °C. The temperature of the waist heating unit is gradually increased from 25 °C to 35.9 °C. The equilibrium temperature of the waist heating unit was gradually increased from 24.5 °C to 34.7 °C. The temperature of the waist heating unit was gradually increased from 24.5 ℃ to 34.7 ℃. At an ambient temperature of (2±2) °C. With rated voltage from 1.0 V to 3.5 V, the equilibrium temperature of the abdominal heating unit gradually increases from 12.8 ℃ to 24.4 ℃. The equilibrium temperature of the back heating unit increases gradually from 16.5 ℃ to 32.6 ℃. The equilibrium temperature of the waist heating unit gradually increased from 15 ℃ to 28.4 ℃. The equilibrium temperatures of all heating elements meet the human body's temperature requirements.

Key words: weft laid-in stitch, silver-plated yarn, electrically heated knitted garments, heating performance, equilibrium temperature