Free Slider
A free slider is a zipper slider that does not have a locking mechanism to hold the teeth in place when you let go of the puller, and moves relatively freely along the teeth.
Contents5 sections
Definition and Overview
A free slider is a component that engages and disengages the teeth when the puller is operated, but does not have a mechanism that locks the slider in place when the puller is released. It is also called a non-lock slider.
A zipper is mainly composed of the left and right teeth, the slider that guides the teeth to open and close, the top stops and bottom stops that hold the ends of the teeth, or the separating box and pin. A free slider is the term used to indicate this operating type of slider.
Difference from a Lock Slider
A lock slider has a structure in which a pawl engages the teeth when the puller is operated, such as by tilting it, making the slider harder to move. It is sometimes used for front openings or pocket openings where you want to keep the closed position.
In contrast, a free slider does not rely on locking to the teeth, so it is suited to applications where a light operating feel is required. However, caution is needed for areas where there is a risk of unintended opening due to tension, vibration, or the weight of contents.
- Free slider: has no locking mechanism, so the slider moves easily.
- Lock slider: designed to restrict movement on the teeth through operation of the puller.
- Reversible slider: a term indicating a structure that can be operated from both the front and back sides, and is a specification separate from whether it locks or not.
Zipper Specifications to Combine With
Free sliders are used in combination with tooth types such as coil, molded plastic, and metal. The compatible slider is determined by the tooth shape, tooth size, and left-right tape specification, so even if the appearance is similar, it cannot be used on a different zipper.
The overall zipper specifications are selected according to the tooth size, length including the tape, stopping method, and opening method. Even with closed-end specifications with a bottom stop, open-end specifications that allow the left and right sides to separate, or two way separator specifications that open and close from both top and bottom, the required slider configuration differs.
- Tooth size is the basic item used to determine compatibility between the slider and the chain.
- The length of the zipper is generally checked as the tooth portion from the top stop to the bottom stop, or from the top stop to the separating box.
- For open-end specifications and two way separator specifications, also check the direction and number of the separating box and sliders.
Applications and Selection Considerations
For pouch and bag openings, garment pockets, and accessory bags, free sliders may be selected because ease of opening and closing is important. On the other hand, for front openings that should not open during wear, or areas where the slider is likely to move due to load, consider using a lock slider as well.
During sewing, it is important not to sew too close to the teeth and not to pull the left and right sides of the tape so that they ripple. If the seam, lining, or thread ends contact the slider or teeth, it can cause jamming or opening/closing defects.
When washing or garment washing is performed, the slider or puller may catch on other clothing. Close the zipper and, if necessary, turn the product inside out and use a laundry net, while considering handling in line with the product's care label and specifications.
Frequently Asked Questions
Will a free slider open on its own?
Because it has no locking mechanism, the slider may move due to tension, vibration, or contact with the puller. This does not mean it will definitely open, but for areas where maintaining the closed state is important, perform wearing tests on prototypes and compare with lock sliders before selecting.
Can a free slider alone be replaced with one on another zipper?
Even if the tooth size appears to be the same, it will not mesh properly if the tooth shape, chain type, or slider standard differs. In addition, it may be necessary to remove the end stops. In principle, select a part that has been confirmed as compatible with the zipper being used.
