Zipper Size
Zipper size is a size number indicated based on the width of the interlocking teeth row when the zipper is closed, and serves as a guideline for selecting opening and closing strength, appearance, and compatible sliders.
Definition and Overview
Element size is a standard indication based on the width of the interlocked elements on the left and right sides of a zipper. It is generally expressed as a number such as “No. ○”; as the number increases, the element row also becomes larger, and it is used for applications that require presence and durability.
However, the number does not indicate the overall length of the zipper. The tape width, slider shape, size of the puller, and the presence or absence of top stops, bottom stops, and a separator box must also be checked separately.
Structure and Components
A zipper is made up of interlocking elements that open and close, the zipper tape that holds the elements, the slider that opens and closes the elements, and the top stop and bottom stop that secure the ends. In an open-end specification, a separator box is attached at the lower end to join and separate the left and right sides.
Element size is mainly an indication related to the dimensions of the element row, and it is directly related to compatibility with the slider. Even with the same number, avoid combining products with different element materials, shapes, or manufacturing specifications, and select items with the same specifications.
- Elements: components that interlock on the left and right to form the opening and closing section.
- Slider: the part that interlocks or separates the elements.
- Top stop and bottom stop: parts that prevent the slider from coming off the end.
- Separator box: the part that joins the left and right sides at the lower end of an open-end zipper.
Types and Specification Checks
Element size is set for each zipper type, such as coil, molded plastic, and metal. Even if the number looks similar, the element thickness, flexibility, abrasion resistance, and tape thickness differ, so it is important not to judge performance by the number alone.
When selecting, in addition to the element size, clearly state in the specification sheet the zipper length, whether it is open-end with one side opening or closed-end with both ends closed, and whether a reverse open-end or double slider is required. Since the length measurement standard may differ depending on the specification, confirm the indication from the supplier.
Main Applications and Selection Notes
Smaller element sizes are generally chosen for thin garments or openings that should not stand out, while larger element sizes are often chosen for areas that require strength and ease of operation, such as outerwear, bags, and workwear. Decide by comprehensively considering the fabric thickness, frequency of use, load, and design balance.
In sewing, design the stitching position and seam allowance so the needle does not hit the elements, and also consider the thickness around the slider. If washing or garment washing is performed, check in advance with samples for discoloration, wear, shrinkage, and any effects on operation of the elements, tape, and slider.
Differences from Similar Terms
Element size and zipper length are different specifications. Element size indicates the size of the closed element row, while zipper length indicates the length of the openable section. Even when the number is the same, choose the required length according to the product's opening dimensions.
Also, the elements refer to the individual interlocking parts that make up the zipper, and the slider is the part that moves them. Coil zippers, Vislon zippers, and metal zippers are different types based on the material and structure of the elements, and are not names for the element size itself.
Frequently Asked Questions
If the element size number is the same, can sliders be shared across different types of zippers?
In general, not necessarily. Even with the same number, the cross-sectional shape and dimensions of the elements, tolerances, and the internal structure of the slider differ among coil, molded plastic, and metal types. When replacing or combining them, confirm compatibility within the same series and the same specifications.
Can the zipper length be determined from the element size number?
No. The number indicates the size of the element row and is a specification separate from the zipper length. Check the opening dimension on the pattern, the positions of the top stop, bottom stop, and separator box, and the sewing method, then specify the length according to the indication standards for each product.
