Zipper Shortening
Zipper shortening is the process of shortening a zipper to match the dimensions required by the product, finishing it in a usable state by removing teeth and resetting the stopper components so it can open and close properly.
Contents6 sections
Definition and Overview
zipper shortening is the process of reducing the length of a standard zipper to the required length. Generally, when shortening from the top, the teeth are removed and the top stop is reattached, while when shortening from the bottom, the process takes into account the specifications of the bottom stop and opening mechanism.
Simply cutting the tape can cause the slider to come off or the teeth to fray. Properly positioning the stopper according to the type of zipper and opening/closing mechanism is fundamental to maintaining both functionality and appearance.
Differences in structure and packing method
A zipper consists of teeth that interlock on both sides, a slider that opens and closes, top and bottom stops to prevent the slider from coming off, and a zipper tape that forms the base fabric. When shortening a zipper, the position of the teeth and stops are mainly adjusted.
With closed zipper, the bottom stop is fixed, so in most cases, the length is adjusted from the top. On the other hand, with open zipper, the opening mechanism at the bottom is responsible for separation, so the length is usually adjusted from the top, leaving the opening mechanism in place.
The method for removing teeth and attaching fasteners differs depending on whether it's a coil zipper, a zipper using resin teeth, or a metal zipper. Larger teeth or metal fasteners may require specialized tools or processing equipment.
- Top stopper: This part prevents the slider from coming off the top end.
- Bottom stopper: This part prevents the slider from coming loose from the bottom in a closed configuration.
- Opening mechanism: This is the lower end component that separates and connects the left and right sides in an open design.
Confirmation of applications and Specifications
For back openings on pants, skirts, and dresses, as well as pockets and pouches, the length is shortened to match the required opening dimensions for the product. For specifications that use a mechanism, such as the front opening of outerwear, it is important to design the fabric to be long enough to leave the mechanism intact.
When specifying a zipper, please check not only the finished length, but also the type of zipper, tooth size, whether it's closed or open, single-sided or two way separator, slider orientation, and top stop shape. Even if the length is the same, different specifications may mean that the zippers cannot be substituted.
How to measure and points to note when sewing
zipper length is generally measured from the inside of the top stop to the inside of the bottom stop, or from the inside of the top stop to the top of the opening mechanism in the case of open zippers. Since this is not the total length of the tape, the measurement standard should be clearly stated in patterns and specifications to prevent misunderstandings.
Before sewing, finish the tape end on the stuffed side and check that the top stop is securely fixed. With thin fabrics, the thickness and stiffness of the stop may show through to the outside, and with thick fabrics, care must be taken to avoid damaging the teeth or tape with the sewing needle or presser foot.
For products that undergo washing or garment cleaning, testing includes checking for tape shrinkage, discoloration of metal parts, and detachment of fasteners. After custom length, the slider is moved back and forth to the end to check for snagging, chipped teeth, and slider detachment.
Differences from similar terms
The length of a zipper refers to the standard dimensions of a finished zipper. In contrast, shortening a zipper refers to the process of shortening a standard zipper after it has been manufactured. Choosing a length close to the required dimensions is effective in reducing the processing burden and variations in the finished product.
Slider replacement is the process of replacing only the slider, often due to damage or a change in function. While length shortening involves adjusting the stopping position and teeth, it doesn't necessarily require replacing the entire slider.
FAQ
Can the zipper be shortened from the bottom as well?
With closed zipper, it's sometimes possible to shorten them from the bottom by remaking the bottom stop. However, with open zipper, the opening mechanism at the bottom has a separation function, so cutting the bottom will cause it to lose its original function. If you want to maintain the original specifications, you generally shorten them from the top.
Do you measure the length of the zipper from one end of the tape to the other?
In most cases, the zipper length is measured from the inside of the top stop to the inside of the bottom stop, rather than the total length of the tape. For open-type zippers, the measurement is generally taken from the inside of the top stop to the top of the opening mechanism. Please check the measurement points in the order or specification sheet.
What should I check if opening and closing the door becomes difficult after shortening it?
Check that the mounting position of the top stopper does not interfere with the teeth, and that any remaining teeth or tape at the end do not touch the slider. Deformation of the teeth, twisting of the tapes on the left and right, and pulling during sewing can also cause opening and closing problems, so check the opening and closing before and after sewing.
