A double needle consists of two needles mounted on a single shaft, allowing you to sew two lines of stitching at once. These needles are available in various widths, typically ranging from 1/8 inch to 1/4 inch apart. Each needle requires its own thread, so you’ll need to use two spools of thread.

3. Control Panel The control panel is the operator’s interface with the bag closer machine. It allows for the adjustment of settings such as sealing temperature, speed, and pressure. Modern machines may also include digital displays and programmable features, enhancing user control and monitoring capabilities.

The machine's operation is facilitated by a specific type of feed mechanism, usually a walking foot or a needle feed system, that ensures the even feeding of fabric layers, particularly useful when working with thick or slippery materials. The combination of the double needle and advanced feed mechanisms allows for precise control over the fabric, enabling users to achieve consistent stitch quality throughout the sewing process.