For procurement and equipment managers in charge of mining operations, importing core crusher components from overseas — especially large, high-precision structural parts like upper frames — is always a challenging task. The typical maritime climate in Southeast Asia, characterized by high temperatures, high humidity, and heavy salt spray, combined with long ocean shipping cycles, makes moisture-proof packaging critical to ensuring components arrive at mine sites in intact condition.

Improper packaging not only causes component rust, emulsified lubricants, and short circuits in electrical parts, but also leads to production downtime, expensive repair costs, and severe project delays. Combining internationally accepted packaging standards with the actual environmental conditions in Southeast Asia, this article explains professional moisture-proof techniques for the import and transportation of upper frames in detail.

Upper frames are typically made of high-strength cast iron or welded steel plates. While structurally robust, their machined surfaces (such as mating flanges and bearing seats) and internal cavities are extremely sensitive to humidity and salt.

Large day-night temperature variations are common during ocean shipping. When saturated moist air inside a container contacts cold metal surfaces, condensation easily forms — commonly known as container rain. This moisture quickly triggers corrosion.

Salt spray from seawater spray penetrates packaging gaps and causes electrochemical corrosion on metals, which deteriorates much faster than in ordinary freshwater humid environments.

Shipping from ports such as Guangzhou or Shanghai to Jakarta, Manila, or Lattakia typically takes 20 to 40 days, plus additional waiting and customs clearance time. Packaging must therefore provide long-term protection under extreme conditions.

To resist these risks, we recommend a five-step protection system: Cleaning → Barrier → Drying → Securing → Marking.

Before sealing, the upper frame must be thoroughly cleaned, with emphasis on removing machining chips, oil contaminants, and fingerprint residues.

Key Operation:

Spray all unpainted machined surfaces (flange mating faces, pin holes, etc.) with rust inhibitor. Oil-based rust inhibitors are recommended, as their dense oil film resists salt spray better than water-based alternatives.

For complex components like upper frames with blind holes, traditional grease application is labor-intensive and fails to cover all surfaces. VCI technology is widely recognized as the optimal solution.

Principle:

VCI materials release invisible anti-corrosion molecules that adsorb onto metal surfaces to form an ionic protective layer. In the sealed environment of ocean transport, this gas reaches every screw hole and hidden area of the upper frame.

Implementation:

Hang or place sufficient VCI rust-inhibiting bags or paper inside the package and ensure the package is fully sealed.

The choice of packaging materials directly determines protection effectiveness.

High-Barrier Aluminum Foil Film:

Use composite moisture-proof bags with an aluminum foil layer, which feature extremely low water vapor transmission rates. Heat-sealed closures completely block external moisture intrusion — the most effective defense against container condensation.

Waterproof Sealing:

Lay waterproof plastic sheeting at the bottom of wooden cases. After fully wrapping the upper frame, seal all seams with waterproof tape.

Since 100% perfect sealing is rarely achievable, sufficient desiccant provides essential buffer protection.

Dosage Standard:

For ocean shipping, apply desiccant at a rate of no less than 200–400 units (typically 500g per unit) per cubic meter of package volume. Use the upper limit for subtropical routes.

Packaging damage is a leading cause of moisture protection failure. Sharp corners of the upper frame must be covered to prevent puncturing the moisture-proof film.

Bottom Securing:

Bolt the upper frame base firmly to heat-treated wooden pallets.

Cushioning:

Fill gaps between the component and wooden case with cushioning materials to prevent violent shaking during transit from cracking the packaging structure.

To ensure smooth customs clearance when importing upper frames, pay attention to the following two points:

Wooden cases and pallets exported to this region must display ISPM 15 fumigation or heat treatment marks. Customs in some countries (Indonesia, Philippines, etc.) may directly order return or destruction of unmarked or poorly marked wooden packaging.

Shipping marks and signs such as “This Side Up” and “Keep Dry” must comply with BS 5609 standards and resist seawater immersion to avoid incorrect handling caused by lost labels.

As a buyer, use the following steps to quickly verify packaging effectiveness upon delivery:

Scientific and rigorous export packaging maximizes the preservation of factory performance for core crusher components after long-distance transport. This not only protects assets but also serves as the first line of defense in maintaining stable operation of mining production lines.