From the perspective of zipper production, zipper manufacturers generally have several reasons: excessive force leads to damage or stuck between the pulling head and the gear, and the later part cannot be pulled and the previous part cannot be pulled. The aging problem caused by the use of too long time pulling head friction is too small, wide mouth height of the pull. The teeth of the gear fell out, causing it to fail to close after being pulled.
To overexert stuck, part of the pull out, the pull head is normally not stuck the other end of the pull, under normal circumstances is that part of the closing, of course it is possible that the open end, this depends on whether head stuck to determine in which direction, and then reset the jammed gear as possible and then down. About the aging problem caused by the pull, generally if the gear is not damaged, and not too old, you can use vice clamp to pull the cap and the edge of the base part, appropriate mouth height adjustment, but not too hard to cause damage to the middle of the top column.
In the case of falling teeth, it is generally recommended to replace them with new ones. Of course, we should pay attention to the same size and color when replacing them, otherwise they will feel ugly after replacing them. The zipper is not smooth generally because of the production, the high deduction of the mouth of the puller and the parameters of the tooth chain do not match, or it is caused by the deformation of the puller. You can use the oil of roller skating, or use the powder of pencil core, paraffin as lubricant, which can appropriately alleviate the situation.
