The vacuum packing bag is sealed. How can I open the zipper?
In addition to wax, you can also use lubricating oil, to pick a relatively transparent, clean kind of, in the zipper ring drop a few drops, repeated several times, can also achieve smooth purposes.
The simplest and most effective way is to apply a layer of wax to the surface of the zipper, and use the lubrication of the wax to achieve a smooth effect. With a candle on the surface of the zipper back and forth after wiping, and then from the bottom of the repeated several times, the zipper will be smooth.
You can pull the zipper tail, the zipper straightened, and then repeatedly from the bottom up, check whether smooth, if not smooth, often because the zipper stuck in other things, so it is not smooth, only need to remove obstacles, you will be back to normal.
