The container arrived in Karachi with a roll forming machine inside. When the buyer opened the doors, the hydraulic pump station had shifted 15 cm from its mounting position, the HMI touchscreen was cracked, and two roll stands had surface rust on the shafts. The machine had crossed three oceans and been transshipped twice. The packaging was inadequate for the journey, and nobody had caught it before departure.
I'm Liyang Ma, Export Manager at ZTRFM. I've shipped over 100 roll forming lines to 40+ countries. The gap between "adequate packaging" and "survives a rough sea voyage" is where most problems happen. This article covers what to specify, what to inspect, and what to do when the machine arrives.
The Three Threats of Overseas Shipping
A roll forming machine in a container faces three threats:
1. Moisture. Condensation inside a sealed container can be severe. As the ship crosses climate zones, temperature swings of 30°C are common. Warm air holds more moisture — when the container cools at night, water condenses on cold metal surfaces. This causes flash rust on bare steel, corrosion on electrical contacts, and mold on rubber seals.
2. Vibration and shock. Ship engines transmit constant low-frequency vibration. Container handling at ports involves drops, tilts, and impacts. A machine that's merely "placed" on the container floor will walk and shift during transit.
3. Salt air. Ocean air contains salt that penetrates every crevice. Unprotected electrical components, bare metal surfaces, and hydraulic cylinders are all vulnerable.
Proper Packaging: What to Specify
When ordering a machine for export, specify these packaging requirements:
Anti-Corrosion Protection
- VCI (Volatile Corrosion Inhibitor) paper: Wrap all bare metal surfaces — roll shafts, frame surfaces, hydraulic cylinders. VCI chemicals vaporize and form a molecular protective layer on metal surfaces. Effective for 6–12 months.
- Desiccant bags: Place 2–4 kg of silica gel desiccant inside the electrical cabinet and around the machine. Absorbs moisture during transit.
- Anti-corrosion oil: Spray hydraulic cylinder rods, bearing surfaces, and any chrome-plated parts with corrosion-preventive oil. Wrap with protective film.
- Sealed electrical cabinet: The control cabinet should have a desiccant bag inside and be sealed with tape at all cable entry points.
Mechanical Fixing
- Steel wire or chain fixation: Every major component (roll former frame, hydraulic station, decoiler, control cabinet) must be fixed to the container floor with steel wire or chains. Not just placed — fixed. Use at least 4 points per major component.
- Wooden blocking: Wooden blocks under the frame at load-bearing points, nailed to the container floor. Prevents lateral movement.
- Bolt-down brackets: The machine frame should have lifting lugs that double as bolt-down brackets. Bolt through the container floor plywood.
- Detach and secure loose items: The HMI, encoder, and any small components that could vibrate loose should be removed, wrapped, and packed separately in a locked cabinet.
Monitoring Devices
- Tilt indicator: A self-adhesive label that turns red if the container tilts beyond 55 degrees. Placed on the outside of the machine or inside the container door. Tells the buyer if the container was mishandled.
- Shock indicator: A tube that fills with color if subjected to impact above 5G. Placed on the machine frame. Documents rough handling during transshipment.
Container Loading
Roll forming machines are heavy and long. A typical roofing line weighs 8–15 tons and is 8–12 meters long. Loading requires careful planning:
| Container Type | Specs | Suitability |
|---|---|---|
| 20-foot container (20GP) | Payload 18–22 tons, internal length 5.9 m | Can fit a small roll former (downpipe line, small roofing line) but not a full-length decking or guardrail line. |
| 40-foot container (40GP/40HQ) | Payload 26–28 tons, internal length 12.0 m; 40HQ height 2.7 m | Fits most roll forming lines. 40HQ gives extra height for machines with tall decoilers or stacking systems. |
Weight distribution matters. The roll former is the heaviest component. Position it centered in the container, with lighter components (decoiler, control cabinet, output table) at the ends. An unbalanced load can shift during ship rolling.
Some machines are too long for a 40-foot container and must be split into two sections. The roll former ships in one container; the decoiler, hydraulic station, and control cabinet in another. Both containers should arrive on the same vessel.
Arrival Inspection: What to Check
When the container arrives, inspect before unpacking:
- Check the tilt and shock indicators. If they're triggered, photograph them immediately. This is your evidence for an insurance claim.
- Open the container doors and smell. A musty or metallic smell indicates moisture intrusion. If you smell rust, the VCI protection may have failed.
- Photograph the container interior before touching anything. Document the condition of the fixation — are the steel wires intact? Have any components shifted? Are the wooden blocks still in position?
- Check for visible damage. Cracked paint, bent frames, broken glass on the HMI, displaced components. Photograph everything.
- Remove the VCI paper and inspect metal surfaces. Light surface rust (a faint brown haze) is normal and can be wiped off with oil. Deep rust (pitting, flaking) indicates a packaging failure.
- Check the electrical cabinet. Open it and look for loose wires, water marks, or corroded terminals. The desiccant bag should still be dry (indicates no moisture intrusion).
- Rotate the roll shafts by hand. They should turn smoothly. If they're stiff or gritty, the bearings may have corroded during transit.
If you find damage, don't start the machine. Contact the supplier with photos and a damage report. Most suppliers include insurance in the shipping cost (CIF terms), but the claim must be filed within 7–14 days of arrival.
Post-Arrival: Before Powering On
Even if the machine looks perfect, take these steps before the first power-on:
- Check the hydraulic oil level. Oil can shift or leak during transit.
- Inspect all electrical connections. Vibration can loosen terminal screws. Tighten any that are finger-loose.
- Remove all shipping brackets, wire ties, and protective film.
- Verify the voltage. If the machine was built for 380V/50Hz and your site has 415V/50Hz or 460V/60Hz, confirm the transformer and VFD are rated for the local voltage.
- Run the line dry (no material) at low speed for 10 minutes. Listen for unusual noises. Check that all sensors and the encoder are functioning.
The Karachi machine? The buyer filed a claim, the supplier sent replacement parts (HMI, hydraulic pump mounting hardware), and the machine was operational within two weeks. But the two-week delay and the back-and-forth could have been avoided with proper packaging specification upfront. When you order a machine, don't just ask about the specifications — ask how it will be packed. The answer tells you a lot about the supplier's export experience.
