Stand at the head of our sheet-pulling line and you'll see something hypnotic: solid plastic pellets disappearing into a machine and coming out the other side as a flat, uniform sheet of plastic — endless and even. That's where every hard-shell suitcase we ship begins.
CLK has been at this for 16+ years: a 33,000-square-meter factory in Ji'an, Jiangxi, five production lines, and a shipped-batch qualification rate of 98%. We handle everything from small batch samples to large wholesale orders, and the equipment below is why we can promise speed and quality at the same time. As the old saying goes: a craftsman who wishes to do his work well must first sharpen his tools.
Five Sheet Pullers, and What They Buy You
Our factory runs five sheet pullers, and they're not simple machines:
- Multi-layer co-extrusion technology — makes lightweight boxes possible, and can extrude composite panels of different materials in the same pass.
- Precise temperature control and speed coordination — different materials need different processing temperatures during simultaneous extrusion, and we hold them separately. The result: uniform plate thickness, low internal stress, and less bending deformation.
- Stable traction and cutting — a high-precision meter and traction mechanism keep cutting length accurate and waste low.
The Hot-Press Line: 60–90 Seconds Per Shell
Five hot-press molding machines are dedicated to PC hard-shell suitcases, with a standard cycle of 60–90 seconds per press run. That's mass production speed. Two technological advantages do the heavy lifting:
- Integrated molding eliminates seams — exceptional structural strength and impact resistance, because there's no weak line waiting to crack.
- Precise replication of mold surface textures — including lychee patterns and diagonal designs — with reinforced ribs built in. The shell looks right and survives right.
Injection Molding for PP Cases: 20 to 32 Inches
For PP luggage cases we run one large precision injection molding machine plus six small ones, covering case sizes from 20 to 32 inches. The system produces highly complex internal structures — reinforcing ribs, snap fasteners, mounting pillars — in a single operation. Dimensional stability keeps components precise and consistent, and the short cycle enables fully automated, unmanned manufacturing. That's the configuration for ultra-large batch orders, the kind where a line runs for weeks without a break.
What Happens Next
After the thermal press molding machine turns plastic sheets into finished shell casings, they go through edge sawing, then into the assembly workshop. That's where shells meet wheels, handles, locks and lining — and where our QC inspectors start their rounds.
The assembly workshop deserves its own post; it's a different world of noise and precision. That's next. In the meantime, if you're evaluating a factory, ask to see the sheet pullers running, not just photos of them. A machine in motion tells you more than a brochure ever will.
About the Author
Written by the CLK Manufacturing Team — 16+ years of custom luggage OEM/ODM experience from our factory in Ji'an, Jiangxi, China. Updated: 2026-08-15.
Related Products & Sourcing
CLK Luggage (Jiangxi Chengleke Leather Co., Ltd.) manufactures custom hard-shell luggage, aluminum-magnesium cases and luggage sets for brands, retailers and corporate clients. Relevant resources:
- Browse our luggage sets and custom OEM/ODM luggage manufacturing
- Why choose CLK — factory profile, quality control and certifications
- Get a quote: contact our team or email clkbusiness@clkluggage.com