1. Use the pull back several times to check whether there is not a smooth, non-self-locking, suddenly opened, other quality problems,
2. ends with a special sewing machine presser foot, sewing zippers sewn back seam invisible zipper, invisible zipper teeth because flip use, it is not easy sewing ironing, prone to tooth card phenomenon.
3. Zipper seam stitching straight, can not have a section of the block. Sewing is not sewn on the sprocket, can not walk, sprocket and original cloth sewn pinhole to prevent obstruction, open the stomach.
4. In the initial pull suture should avoid overexertion, too fast, easy to plug the zipper teeth or badly damaged (such as cards or tooth cracking phenomenon, teeth or put the card in the open position, the zipper teeth cracked hands can raze profits tumble return), there is no damage or deformation, check the zipper teeth with a finger back and forth in the direction of compression zipper teeth head several times, allowing the fastener to return to the original gap not previously, in order to pull together smoothly.
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