Sewing threads thread performance

The silica-based fibres are typified by Quartzel (Saint-Gobain, France), which while having slightly inferior fire and heat performance to alumina-based fibres (see Table 8.5), are available as continuous filament yams, rovings, and chopped strands (each comprising 9 or 14 pm diameter filaments) and sewing threads, filament-based nonwovens, and wetlaid papers. Continuous filament yams may be knitted and woven to yield fabrics with applications in furnace insulation, combustion chamber insulation in aircraft, ablative composites for military and other markets, and hot corrosive gas and liquid filtration. 

The relevant sewing thread properties affect the appearance and performance of a seam based on their interaction with the fabric properties. Thus the important thread properties from that point of view are ... 

Sundaresan, G., 1996. Studies on the Performance of Sewing Threads during High Speed Sewing in an Industrial Ockstitch Machine (Ph.D. thesis). DT Delhi, India. 

The book Stitches and Seams (Laing and Webster, 1998) provides a detailed analysis of the fundamentals of different types of stitches, seams and sewing threads explains how they are produced and examines their optimum design, performance and modes of failure. 

Figure 13.18 Photographs of polymer coil muscles (a) and dexterous prosthetic hand driven by the muscles (b) demonstrating various grasps (c). ( 2015 IEEE. Reprinted with permission from ref. 85 Yip and Niemeyer High-performance robotic muscles from conductive nylon sewing thread , IEEE International Conference on Robotics and Automation (ICRA), 2015, 2313-2318.)...

Biocompatibility experiments on PGA sewing thread indicate low inflammation reactions of the tissue. After two years, the implanted PGA specimen was completely degraded. Since these first experiments, numerous in-vivo investigations have been performed with PGA and no severe immune reactions have been recorded [990]. 

The first generation of computerised machine featured a needle positioner (NP) and UBT. The NP can definitively take/move the needle either up or down based on settings, when the machine stops and the UBT automatically cuts the threads whenever the machine gets a signal to complete/terminate sewing. While using this first generation of the machine, only activities (3), (5) and (6) in the list in Section 11.5 are eliminated, but the operator still needs to perform the rest of the wasteful motions. 

On 15 single-jersey fabric (polyester, dTex 100/34 x 2) samples a 15 x 12 cm sewing of a length of 15 cm was performed with three different stitch lengths 1.25, 2.25, and 3.25 each on five fabric pieces. Loose ends (10 cm) of both threads were left at the beginning and from the end of the seam for electrical connection see Fig. 28.26. 

---