In the final process before the packaging of the finished product, a general inspection of the finished product will be carried out. The general inspection is to stabilize the production process to inspect the defective products produced during the production process, to confirm whether the zipper is good, and generally focus on the following elements. Cloth belt: dyed evenly, without stains, no scars, and soft to the touch. Observed in the natural vertical or horizontal direction, the cloth belt should be wavy. Teeth: The surface is smooth, feels soft when pulled, and the noise is small. Pull head: Self-locking pull head pulls easily, locks without slipping. Adhesive: fasten the cloth tape, not easy to break and fall off. Blocks, bolts: intersperse freely, fasten cloth tape. Top stop: Fasten the first tooth (metal, nylon), the distance cannot exceed 1mm, and it is strong and perfect. Bottom stop: fasten the sprocket or pliers on it, and it is strong and perfect. Testing method: Pull the slider to move back and forth, the slider glides smoothly, flexibly, and there is no feeling of jumping or blocking. Special attention should be paid to the fact that the slider is in the top stop, bottom stop and the socket is activated without barriers. Whether it is flexible to turn the pull-tab within 180 degrees. For opening zippers, insert the cannula into the socket or pull out the cannula to check whether it is flexible and barrier-free. Pull the two zipper belts at an angle of about 60, and the pulling speed is moderate. If the slider does not slide, it means the self-locking of the slider is good, otherwise it means there is no self-locking or the self-locking strength is not enough, and the pull tab is perpendicular to the plane of the pull body Lift up and the cap is firm.