Top Stop
A top stop is a stop component attached to both tapes at the upper end of a zipper to prevent the slider from coming off the teeth.
Definition and Structure
The top stop is a component that prevents the slider from coming off the top end when the zipper is closed. It is generally attached to each of the left and right zipper tapes, and serves to define the end position of the teeth and where opening stops.
A zipper consists of teeth, a slider that engages the teeth, tape, a top stop, a bottom stop, and other parts. The top stop is a small part, but it is important because it supports the end point of opening and closing and prevents the slider from coming off.
- Teeth: Elements that interlock on the left and right to form the opening and closing section.
- Slider: The part that engages or separates the teeth.
- Bottom stop: A part at the lower end of a closed zipper that prevents the slider from coming off.
Types and How to Consider Specifications
The shape and material of the top stop differ depending on whether it is used with a metal zipper, coil zipper, zipper with molded resin teeth, and so on. Depending on the type of teeth, the top end may be formed not by a separate top stop part, but by a molded stop section or by tape finishing.
When selecting a top stop on its own, the basic rule is to match it to the type of zipper and the tooth size. If the tooth size does not match, the slider may pass through or catch at the top end.
- Type of teeth: Check whether they are metal, coil, or molded resin teeth.
- Tooth size: Confirm according to the zipper standard notation and specification sheet.
- Color and surface finish: Check the appearance in relation to the slider, teeth, and tape.
Relationship Between Applications and Zipper Specifications
Top stops are used for closed zippers, open zippers, two way separators, and more. However, because the lower-end structure differs in open zippers with a separating device, the presence and shape of the bottom stop differ from those of closed zippers.
In apparel, they are used at the top ends of front openings, pockets, side openings, cuffs, bags, and more. Depending on the product opening direction, load, and appearance, the overall zipper type, length, and slider are selected together as part of the specification.
- Closed zipper: A specification in which the top and bottom ends stop, and the left and right sides do not fully separate.
- Open zipper: A specification in which the left and right sides can be separated by the separating device at the lower end.
- Two way separator: A specification that can be opened and closed from both the top and bottom by multiple sliders.
Notes on Sewing and Handling
When sewing, take care not to press too hard near the top stop or let the needle hit the top stop itself. To prevent needle breakage and uneven stitching, check in advance the finishing position at the top end, the seam allowance, and the range in which the slider moves.
In general, zipper length is treated as the length related to opening and closing from the top stop position to the bottom stop position. However, because measurement standards may differ for open specifications and product designs, compare the specification sheet with the supplier's standard for notation when placing an order.
When washing or garment washing is performed, check the durability, discoloration, deformation, and tape shrinkage of the entire zipper, including the top stop. Consider handling that follows the product's washing instructions and intended use, such as closing the puller before washing.
Frequently Asked Questions
What is the difference between a top stop and a bottom stop?
A top stop is a part that prevents the slider from coming off at the top end of the zipper. A bottom stop is installed mainly at the lower end of a closed zipper and similarly prevents the slider from coming off. At the lower end of an open zipper, a separating device is used instead of a bottom stop.
Can a top stop be attached later?
If the top stop matches the type of zipper and tooth size, it may be attached later by repair or processing. However, special tools and appropriate crimping conditions are required. After installation, check the slider passage and the fixed condition.
Is zipper length measured including the top stop?
The standard for indicating length depends on the zipper specification. In general, it is checked based on the stop positions at the top and bottom ends, but it may not match the total tape length. When ordering or sewing, always compare the specification sheet with the supplier's dimensional notation.
