Zipper Gapping Machine: How Gap Spacing Works + Line Specs
A zipper gapping machine is the equipment that cuts gaps in the zipper chain to create individual zipper lengths. Without precise gap spacing, zippers won't align with sliders, stops, or the garment opening. In this article, we explain how gap spacing works, what machine options you have, and how Jeso's gapping machines fit into a complete zipper production line.
What Is a Zipper Gapping Machine?
A zipper gapping machine removes a small section of teeth (elements) from a continuous zipper chain at set intervals. This creates a blank space where the slider sits when the zipper is closed, and where top and bottom stops are later attached. The gap must be exactly the right width and position for the slider to move smoothly.
Gapping is done after the zipper chain is formed but before cutting to length and adding stops. It is a critical step for nylon coil, resin (plastic), and metal zippers.
How Gap Spacing Works
The machine uses a sensor or mechanical stop to measure the chain length. A punch or blade then removes the teeth at the programmed position. For resin zippers, the gap is often created during injection molding (by not injecting teeth in that section). For nylon coil and metal zippers, the gap is punched out after the chain is made.
Key parameters: gap length (usually 10–30 mm), gap position from the end of the zipper, and the number of gaps per length. Modern machines allow quick changeovers via touchscreen controls.
Jeso Zipper Gapping Machine Models
Jeso offers dedicated gapping machines for each zipper type. All models are factory-direct, built for durability and precision.
| Model | Zipper Type | Process | Key Feature |
|---|---|---|---|
| PM-013 | Resin (plastic) | Injection molding – gaps formed in mold | No separate gapping step; teeth and gaps molded in one shot |
| PM-021 | Plastic (polyacetal) | Gapping punch after molding | High-speed punch for pre-molded chains |
| PM-031 / PM-032 | Nylon coil | Punch gapping | Handles #3–#10 coil; adjustable gap length |
| PM-051 | Metal (brass, aluminum, nickel) | Punch gapping | For #3–#10 metal chain; hardened tool steel punch |
Note: PM-013 uses injection molding, not die-casting. The gap is created by the mold design. For PM-021, PM-031/032, and PM-051, the chain is first formed, then gapped in a separate station.
Gapping in the Full Production Line
A zipper gapping machine does not work alone. It is part of a sequence. For example, a nylon coil zipper line might go: PM-550 coil winding → PM-560 sewing onto tape → PM-531/532 tape drying → PM-031/032 gapping → PM-321/322 slider inserting → PM-361 top stop → PM-371 bottom stop → PM-081/082 cutting. Jeso provides all these machines, so the line integrates smoothly.
For resin zippers, the PM-013 injection machine molds the teeth and gaps together, then the chain goes to PM-301/302 tape bonding, PM-310/311 punching (for slider box), and then to stop attaching and cutting.
Why Precise Gap Spacing Matters
If the gap is too narrow, the slider will jam. If too wide, the zipper looks sloppy and may not close properly. If the gap is off-center, the slider will sit crooked. Buyers from zipper factories know that consistent gap spacing reduces rejects and speeds up assembly.
Jeso machines hold tolerance within ±0.5 mm for most models. The PM-013 injection machine can hold ±0.2 mm because the gap is formed in the mold.
How to Choose the Right Gapping Machine
Consider these factors:
- Zipper material: Resin, nylon, or metal – each needs a different machine.
- Zipper size: #3 to #10 are common; some machines can handle larger.
- Production volume: High volume? Look for automated feeding and quick changeover.
- Integration: Do you need a complete line or just a gapping machine? Jeso offers both.
Frequently Asked Questions
Q: Can one gapping machine handle all zipper types?
A: No. Resin zippers require injection molding (PM-013). Nylon and metal need punch-type machines (PM-031/032 or PM-051). Plastic zippers (polyacetal) use PM-021.
Q: How fast is a Jeso gapping machine?
A: Speed depends on model and chain length. Typical output: 30–60 pieces per minute for PM-031/032. Contact us for specific cycle times for your zipper size.
Q: Do you provide training?
A: Yes. We offer on-site training and manuals in English. Our engineers can also help with line layout.
Q: Are spare parts available?
A: Yes. All Jeso machines have readily available spare parts. We ship worldwide from our factory in Wenzhou.
Conclusion
Choosing the right zipper gapping machine is essential for consistent quality and high output. Jeso offers dedicated models for resin, nylon, plastic, and metal zippers, all built for precision and durability. As a factory-direct supplier, we provide complete lines from tape weaving to final packaging.
Contact Jeso today to discuss your zipper production needs. Our team can recommend the right gapping machine and help you plan a full line that fits your factory. Get in touch for a quote or technical consultation.