Big bag sewing machine

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  • Lock sewing, often referred to as “lock stitch sewing,” is a technique that utilizes two threads—one from the needle and the other from the bobbin—to create a secure stitch. The stitches interlock at the seam, making it less prone to unraveling. This method is widely used in both industrial and home sewing machines because of its efficiency and the neat finish it provides.


  • Heavy duty sewing machines are suitable for projects such as upholstery, quilting, and making bags, as well as materials like vinyl, suede, and multiple layers of fabric.
  • Exploring the Art of Special Sewing


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