Introduction to Zipper Mold

Introduction to Zipper Mold

Zipper mold is the core tool for producing zippers, used to manufacture key components such as zipper teeth, sliders, and upper and lower stops. Its accuracy and durability directly affect the smoothness, strength, and appearance quality of the zipper.

1. Classification
By function: Chain tooth mold (stamping or injection molding), slider mold (zipper head), upper and lower stop molds (to prevent detachment).
According to the process: stamping mold (metal zipper), injection mold (plastic/nylon zipper), die-casting mold (zinc alloy parts).
According to zipper type: closed zipper, open zipper, invisible zipper mold, etc.
2. Structure and Materials
The mold is mainly composed of a mold cavity, a mold core, a guiding system, and an ejection mechanism. The material is mostly made of high hardness alloy steel (such as SKD11, S136), and is treated with chrome plating or nitriding to improve wear resistance.
3. Technical requirements
High precision: tooth pitch error ≤ ± 0.01mm, ensuring smooth bite.
Long lifespan: It needs to withstand over a million stamping or injection molding processes.
Smooth finish: Avoid burrs and ensure the zipper feels comfortable.
4. Production process
Design (CAD/UG) → Precision machining (CNC/EDM) → Heat treatment → Trial mold debugging → Mass production maintenance.
5. Development Trends
Miniaturization: adapted to finer invisible zippers.
Automation: Matching high-speed punching machines to improve efficiency.
New materials, such as ceramic coatings, extend the lifespan of molds.

The manufacturing level of zipper molds directly determines the quality of zippers and is an important support for industries such as clothing, luggage, and outdoor products.