The Function of Thick Thread Sewing on Sofa

"Thread trace" refers to the organizational form formed by the stitching thread on the surface of the stitched material or passing through the material. When choosing a leather sewing machine, we should select the model according to the material to be sewn. Leather machines have single-needle stitches and double-needle stitches, and the organizational form formed on the material is determined by the method used (self-linking, interlinking, or chain-locking). In addition, a thread trace is only a unit that makes up the stitch.

In addition to the main function of connecting stitches, the thread trace also has a reinforcement function (maintaining the stability of certain parts), a protection function (preventing the fabric edge from unraveling), an auxiliary processing function, a decorative function, etc. There are thousands of types of sewing equipment. In addition to the garment industry, the leather products industry (including leather shoes, fur, leather clothing, belts, leather bags, suitcases, etc.) also extensively uses leather sewing machines. The furniture manufacturing industry (such as sofas, mattresses, bedspreads, and tents) will use sofa sewing machines, and many other industries, such as the automobile manufacturing industry (such as seats), will use heavy-duty leather sewing machines and coarse thread sewing machines.

Below are several types of commonly used leather sewing machine thread traces in the 300 series, for reference only:

301 thread trace: straight double-needle lockstitch thread trace, the shape of the thread trace on the front and back of the material are the same, so it is convenient to operate in the process and is a commonly used type of leather sewing machine thread trace.

304 thread trace: zigzag double-needle lockstitch thread trace, shaped like a zigzag, has high elasticity compared to the 301 thread trace and has a certain degree of extensibility. In shoe production, it is often used in conjunction with various sewing accessories for joint seaming, edge trimming, and tape reinforcement.

306 thread trace: double-line lockstitch blind thread trace, the machine needle passes through the same side of the material, so one side of the thread trace is a double-line dashed line, and the other side cannot see the thread trace. Suitable for fur garment folding machine.

The above is the thread traces in the 300 series, which have the advantages of simple structure, firmness, not ease to unravel, and less thread consumption.