LS-4241B Double Head Zipper Pre-Expansion Machine
- Description
Description
Máy Giãn Nhiệt Dây Kéo Hai Đầu LS-4241B – Giải Pháp Chống Gợn Sóng Đường May Cho Nhà Máy May Công Nghiệp
The LS-4241B Zipper Pre-Expansion Machine is an industrial machine designed to pre-stretch and heat-stabilize zipper tape before it is sewn into a garment — eliminating the wavy, puckered seam defect commonly seen on lower-quality jackets, hoodies, and zippered apparel.
Why Do Zipper Seams Turn Wavy After Sewing?
Zipper tape (the fabric strip along a zipper) is often unevenly tensioned after weaving and dyeing. When sewn directly without pre-treatment, residual tension in the tape gets pulled unevenly during stitching, causing a wavy or rippled seam once the garment is finished — a defect that is especially visible on long zippers used in jackets and hoodies.
The industrial solution is to pre-expand and heat-stabilize the zipper tape before it reaches the sewing line, releasing residual tension and stabilizing tape dimensions in advance.
How the LS-4241B Solves This
The LS-4241B uses a double-head design that enables automatic feeding and simultaneous two-way processing, drastically cutting handling time compared to manual stretching-and-ironing methods still common in many garment factories.
Performance results (per manufacturer data):
| Metric | Before | After LS-4241B |
|---|---|---|
| Processing time | ~17 sec/piece | ~3–5 sec/piece |
| Efficiency gain | — | ~350% |
| Seam quality | Inconsistent, prone to puckering | Stable, adjustable expansion ratio |
Technical Specifications
| Parameter | Detail |
|---|---|
| Model | LS-4241B |
| Voltage | 220V, 50–60Hz |
| Power | 8.5 KW |
| Machine dimensions | 1460 × 715 × 1390 mm |
| Packing dimensions | 1540 × 795 × 1470 mm |
| Net weight | 215 kg |
| Gross weight | 315 kg |
Zipper Tape Processing Range
| ymbol | Meaning | Range |
|---|---|---|
| A | Zipper length | > 150 mm |
| B | Total width | 20–50 mm |
| C | Zipper width | 5–37 mm |
| D | Tape width | 30–95% |
| Stretch ratio | — | 1.00–1.05x |
Key Features
- Double-head automatic feeding design: supports two-way operation, switchable on demand, maximizing production line throughput.
- Remote data collection system (optional): enables remote monitoring of failure rate data, capacity data, and usage data — useful for factories moving toward digital production management (Industry 4.0-ready for RMG operations).
- Broad application range: suitable for most zipper types used on jackets, hoodies, and other zippered garments requiring precise seam alignment.
Who Should Use the Zipper pre-expansion machine LS-4241B?
This machine is built for:
- Export-oriented garment factories producing jackets, hoodies, and sportswear with strict seam-quality requirements.
- Manufacturers experiencing high rework/rejection rates due to wavy zipper seams.
- Factories in India and Bangladesh’s RMG sector looking to reduce dependency on manual tape-stretching and ironing labor, and standardize quality across shifts.
Frequently Asked Questions
Is zipper pre-expansion necessary for all zipper types?
It is not mandatory for every zipper, but it is strongly recommended for long zippers (over 150mm) used in jackets and hoodies, where wavy seams are most visible and most likely to affect the garment’s final appearance and buyer acceptance during quality inspection.
Is the LS-4241B suitable for small and mid-sized garment units?
Yes. The double-head feeding design improves throughput, making it suitable for both mid-sized subcontracting units and large export-oriented factories that process high volumes of zippers daily.
Does the machine require special power infrastructure?
The machine runs on standard 220V, 50–60Hz power, which aligns with common industrial power supply standards across India and Bangladesh. Follow the manufacturer’s maintenance schedule for optimal performance.
Contact us for a consultation or to schedule a machine demo at our showroom:
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Phone: (+84) 0983 309 910 (WhatsApp, WeChat, Zalo)
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Email: marketing@hoshima-int.com
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