Zipper Anatomy
Introduction
Zippers are integral components in various products, from garments and bags to
industrial equipment and outdoor gear. Understanding the anatomy of a zipper is
essential for selecting the right zipper for your specific application. This guide provides
an overview of the primary zipper components, their characteristics, and functions.
1. Tape
The tape is the fabric part of the zipper to which the teeth are attached. It is sewn into
the material of the product. Tapes are typically made from polyester, but can also be
made from cotton or other materials depending on the application.
- 1851: Elias Howe, the inventor of the sewing machine, received a patent for an "Automatic, Continuous Clothing Closure." However, he did not pursue its commercial development.
- 1893: Whitcomb L. Judson introduced the "Clasp Locker," a hook-and-eye shoe fastener, at the Chicago World's Fair. While innovative, it lacked reliability and failed to gain widespread acceptance.
2. Teeth (Chain)
Teeth are the interlocking elements that open and close the zipper. They can be made
from metal, plastic, or nylon. The size and material of the teeth affect the strength and
flexibility of the zipper.
3. Slider
The slider is the mechanism that moves up and down the chain to open or close the
zipper. Sliders can have locking or non-locking mechanisms, and come in various
shapes and sizes to suit different applications.
4. Pull Tab
Attached to the slider, the pull tab allows for easy movement of the slider along the
chain. Pull tabs can be customized in shape, size, and material for both functional and
aesthetic purposes.
Modern Developments
5. Top Stop
The top stop is a component affixed to the top end of the zipper to prevent the slider
from coming off the chain. It ensures the slider does not detach when the zipper is fully
opened.
6. Bottom Stop
Similar to the top stop, the bottom stop is located at the bottom end of the zipper. It
prevents the slider from coming off the chain when the zipper is fully closed. In
separating zippers, this function is served by the retainer box and insertion pin.
7. Retainer Box and Insertion Pin
Found in separating zippers, the retainer box and insertion pin work together to align
and join the two halves of the zipper. The insertion pin is inserted into the retainer box,
allowing the slider to engage the teeth and close the zipper.
8. Reinforcement Film
Some zippers feature a reinforcement film, a strip of plastic fused to each half of the
zipper tape. This allows manufacturers to electronically "weld" the zipper onto the
garment or item without sewing, providing a strong and durable bond.
Conclusion
Understanding the components of a zipper is crucial for selecting the appropriate zipper
for your product. Each part plays a vital role in the functionality and durability of the
zipper. For personalized assistance in choosing the right zipper for your application,
please contact Lenzip at info@lenzip.com or call 847-368-9000.
