Reverse Coil
A reverse coil is a coil zipper with the coil-shaped teeth placed on the back side of the zipper tape, creating an appearance in which the teeth are less visible from the front.
Contents6 sections
Definition and Overview
A reverse coil fastener is a type of coil zipper that uses spiral-shaped resin teeth. Unlike a regular coil zipper, the side with the teeth is reversed, with the tape side primarily visible on the front. It is used in applications where a clean, streamlined appearance is desired, where the teeth should not be conspicuous.
"Reverse coil" is a term used to describe the arrangement and appearance of the teeth, and does not refer to the opening or closing mechanism itself. Specifications such as open, closed, and two way separator are specified separately from the reverse coil.
Structure and parts
The basic components are a continuous coil of teeth, a zipper tape supporting the teeth, a slider for opening and closing, a pull tab, and top and bottom stops. In the open type, an opening mechanism is provided at the bottom end, allowing the left and right tapes to be separated.
Because the teeth on the front are hidden, it has a flatter appearance compared to a regular coil zipper. However, since the parts that interlock during opening and closing are on the back, it is important to check the orientation during sewing and the direction in which the slider is operated.
Types and specifications
The tooth size refers to the width and thickness of the coil. It's chosen based on the textile thickness of the application, the required opening and closing strength, and the desired appearance. Thinner teeth are used in light clothing and pockets, while larger teeth are used in outerwear and bags.
The length is generally determined based on the distance from the upper stop to the lower stop, or the continuous section of teeth including the opening tool. Since measurement standards and excess tape length vary depending on the product, when ordering, please check not only the indicated length but also the specifications and a physical sample.
- A closed zipper without an opening mechanism.
- Open zipper with a detachable bottom end
- A two way separator zipper that can be opened and closed from both the top and bottom.
- Double slider using two sliders
Main applications
Reverse coils are used in clothing and fashion miscellaneous goods where the teeth are not visible as part of the design and the tape surface needs to blend in. They are sometimes used in pockets of jackets, blousons, pants, and skirts, as well as in the openings of bags.
Because the exterior is relatively understated, it's easy to match with a variety of styles, from sporty to minimalist. However, if you require waterproofing or water resistance, you should consider other necessary performance specifications, such as water repellent zipper, in addition to the fact that it's a reverse coil design.
How to choose and points to note
In sewing, the front and back of the tape relative to the outer fabric, the front side of the slider, and the orientation of the pull tab should be clearly specified in the sewing specifications. If the left and right tapes are not twisted and the alignment of the stitching teeth is not kept parallel, it will cause waviness, opening and closing problems, and puckering.
When washing or cleaning products, it is essential to keep sliders and pulls closed to prevent them from damaging other items. Since the appearance and ease of opening and closing can vary depending on the textile, washing method, and post-processing, testing is conducted in the product state before mass production.
FAQ
What is the difference between reverse coil and concealed zipper?
A reverse coil zipper is a zipper where the coil teeth are positioned on the back of the tape, making them less visible from the front. A concealed zipper has a structure and sewing method that hides the zipper itself in the seam when closed. A reverse coil zipper can be designed so that the tape and slider are visible even when closed.
Where do you measure the length of a reverse coil zipper?
In most cases, check the length from the top stop to the bottom stop, or the length of the teeth portion including the opening mechanism. The total length of the tape may not match the indicated length. Standards may differ for open, closed, and custom lengths, so please check the specification drawing and the actual product before ordering.
