Core tip: Print or weave a continuous cloth tape with a pattern, text, or mark with complementary halves, and transport it into a sewing machine in the reverse state. 

 How to make invisible trademark zippers：

 1. Reverse fold the two-zipper cloth straps that have completed the cutting action; the meshing action is implemented through the slider of one zipper, and the complementary halves of the patterns, texts, or marks that were originally placed on the two-zipper cloth straps will be matched and aligned naturally.；

 2. The two sprocket gear rows are pre-arranged through a sprocket gear conveying device to implement a fixed pitch, and the synchronization and tooth-by-tooth conveying operation can be accurately corresponding between the sprocket teeth and the pitch, and the two sprocket gear rows are in the shape of tooth heads facing outwards and with the tooth heads facing outwards.The continuous cloth belt is transported into the sewing machine together；

 3. The two-chain tooth row is then stitched by two sets of stitches at a predetermined position on both sides of the longitudinal middle of the pattern, text or marking surface of the continuous cloth belt.；

 4. Print or weave a continuous cloth tape with a pattern, text or mark with complementary halves, and transport it into a sewing machine in the reverse state.；

 5. Using a cutting device, the continuous cloth straps of the two sprocket rows that have been sewn are cut from the middle of their longitudinal direction to form two zipper straps with the sprocket row and a reverse folding cloth edge respectively.