Pin And Box

Definition and Overview

The opening mechanism is a component used in zipper that allows the left and right zipper tapes to be completely separated from their bottom ends. It consists of a box attached to one end of the tape and a pin attached to the other end of the tape. The pin is inserted into the box, and then the slider is pulled up to close it.

A zipper with an opening mechanism is generally called an open-type zipper . The opening mechanism refers to the component at the bottom of the zipper, and differs in scope from the term "open-type zipper ," which refers to the entire opening and closing mechanism of the zipper .

Structure and parts

The box is the component that receives the latch and allows the slider to start moving from the correct position. The latch is a long, slender component that is inserted into the box and must be securely inserted all the way in when in use. These are attached to the lower ends on both the left and right sides of the zipper tape.

A zipper consists of interlocking teeth, a slider that opens and closes, a tape, and a top stop at the top end. The opening mechanism is located at the bottom end and, like a normal bottom stop, not only prevents the slider from moving but also separates and connects the left and right sides.

• Box: This part receives the hinge rod and determines the starting position of the slider.
• Butterfly bar: This is a part that is inserted into the box to connect the tapes on the left and right sides.
• Teeth: These are elements that interlock on the left and right sides, forming the opening and closing mechanism.
• Slider: This is a component that engages or disengages the teeth of a dental prosthesis.

Types and specifications

zipper with opening mechanisms are available in various types, including coil, resin molded, and metal. The tooth size, tape width and color, and slider type are selected based on the product thickness, required strength, appearance, and operating environment.

Even if the lower end is designed with an opening mechanism, the upper end usually has a stopper to prevent the slider from coming loose. Opening mechanisms are also used in two way separator opening designs that can be opened from both sides, and in designs that use multiple sliders, but the opening mechanism and slider configuration need to be checked separately.

The length of a zipper is generally determined by the continuous length of the teeth from the top stop to the opening end of the bottom zipper. Since this may not match the total length to the end of the tape, it is important to align the specifications, patterns, and measurements of the actual product.

Main applications

This type of opening is often used for outerwear, blousons, and vest that open wide at the front center for easy on and off. Because it allows the garment to open flat, it is also suitable for layering and for applications where the product needs to be handled in an open state.

For sportswear, outdoor wear, and uniforms, the type and size of teeth are considered based on the frequency of use and the amount of movement. They are also used in bags, where the suitable applications are chosen based on how the load is applied and the direction of opening and closing.

How to choose and points to note

When selecting a zipper, clearly specify the length, tooth size, tooth type, tape color, slider, and whether or not there is an opening mechanism and the direction of opening. If it is not necessary to separate the left and right tapes, a closed-type zipper with a bottom stop may be suitable.

When sewing, be careful not to sew in the opening mechanism box or hinge pin, and avoid restricting movement with seam allowances or hem finishes. Since misalignment of the left and right tape positions will affect the teeth's closure and appearance, align the bottom and front ends and temporarily fasten them in place.

For products that undergo washing or garment washing, we check for tape shrinkage, component deformation, and tooth meshing, including testing with the opening mechanism and slider closed. The effects of washing conditions and post-processing are evaluated for each zipper specification used.

FAQ

What is the difference between an open fastener and an open zipper?

The "opening mechanism" refers to the box and pin components at the bottom of the zipper used to separate the left and right sides. An open-type zipper is a zipper specification where the left and right tapes can be completely separated using the opening mechanism. The terms are used differently for the part name and the zipper specification name.

Where do you measure the length of a zipper with a pull tab?

Generally, the length of the zipper is determined by the length of the teeth from the top stop at the upper end to the opening end at the lower end. However, measurement standards may differ depending on the product and specifications. Do not confuse this with the total length to the end of the tape, and check the dimensions provided by the supplier.

What are some points to keep in mind when sewing a zipper with an opening mechanism?

The box and the hinge pin move freely, ensuring there is enough room for the hinge pin to be inserted all the way into the box. If the left and right positions of the front edge or the hem position are misaligned, it can lead to problems with opening and closing or a distorted appearance, so the left and right sides are sewn together while suppressing the stretching of the tape.