PVC zipper bags can be divided into PVC bags, cosmetic packaging bags, stationery packaging bags, craft jewelry packaging bags, gift bags and other product packaging according to different thicknesses and uses. For example, many high-end products generally use PVC bags for packaging, beauty products, to improve product grade, but the price is more expensive than OPP bags/PE bags.
PVC zipper bags are easy to take and put. In the eyes of packaging manufacturers, the production process requirements are still very high compared to plastic bags without zippers. Today, let's take a look at how to avoid wrinkles in PVC zipper bags?
There are two common problems in PVC zipper bags: one is the partial layer or surface wrinkles on both sides of the zipper; the other is the surface wrinkles at the seal between the zipper and the bag body.
The wrinkles on both sides of the PVC zipper bag are sometimes related to the selection of the zipper. When purchasing a zipper, we must pay attention to the melting point and shrinkage rate being less than or equal to the melting point and shrinkage rate of the composite film heat-sealing layer to prevent wrinkles caused by a serious mismatch between the melting point and the shrinkage rate.
