How to choose packaging materials suitable for long-distance transportation?

Industry Overview

The core challenges faced in long-distance transport (over 500 km or with multi-day transit times) are cumulative vibration, temperature and humidity cycling, prolonged stacking, and multiple transshipments. Corrugated boxes that hold up for 1-2 days over short distances may collapse outright during 5-7 days of long-distance transport. Below, the material selection logic is broken down by transport scenario.

Material 1: Corrugated Board (Primary Material)

Corrugated board is the primary material for long-distance transportation, accounting for more than 80% of e-commerce shipping packaging. It is divided into five flute types based on profile: E, B, C, EB, and BC, with significant differences in load-bearing and cushioning performance. For long-distance transportation, B-flute or double-wall corrugated is preferred; single-wall E-flute is only suitable for light, small items under 10kg.

Moisture content is the number-one issue in long-distance scenarios. When the moisture content of the board exceeds 12%, compressive strength drops by 30-50%. Three scenarios—rainy season in the south, ocean shipping containers, and cold chain ingress/egress to cold storage in the north—must use moisture-resistant corrugated (film lamination or coating). After film lamination, the moisture content of the board remains stable at 8-10%, and compressive strength is preserved.

For long-distance transportation, it is recommended to increase the liner board grammage to 250-300g, with the medium at 180g or above. Low-end cartons (150g liner) are cheaper, but after 5 days of long-distance transit the board softens back, and with even a slightly higher stacking count the bottom layer collapses.

Material Two: Plastics and Films (Moisture Barrier)

Plastic films primarily serve as moisture barriers and sealing layers, and are not used as the outer structural layer directly. For long-distance sea freight and cold-chain transportation, it is recommended to add a PE film liner to the inner wall of the outer carton, with a thickness of 0.05-0.08mm. Food-grade PE film complies with GB 4806.7 and can be in direct contact with food.

Air column bags, PE stretch film, and EPE pearl cotton are also commonly used materials for long-distance transportation. Air column bags are suitable for irregularly shaped electronic products, providing a high degree of fit when inflated and wrapped around the item; EPE pearl cotton offers excellent cushioning performance, making it suitable for precision instruments that are vulnerable to impact; PE stretch film is used to wrap pallets as a whole, preventing cartons from shifting during transportation.

When using plastic materials for long-distance applications, attention should be paid to their temperature resistance range. Standard PE withstands temperatures from -40 to 80°C, and standard PP withstands temperatures from -20 to 130°C. Cold-chain environments experience significant temperature fluctuations when entering and exiting cold storage, so it is recommended to choose PP or PET materials, as standard PE may become brittle and crack at low temperatures.

Material Three: Wood-Based Materials (Heavy-Duty and Irregular-Shape Applications)

Wood-based materials are primarily used for securing and reinforcing heavy machinery and irregularly shaped products. Plywood (multi-layer board) undergoes high-temperature treatment during production and is exempt from ISPM 15 for engineered wood products, allowing it to be exported directly. Solid wood, however, requires heat treatment or methyl bromide fumigation, along with the application of the IPPC mark.

A common solution for long-distance transport of heavy equipment is: plywood crate + internal bracing + cushioning pads. Wooden crates cost far more than corrugated boxes, but they can bear loads of several hundred kilograms and are reusable. It is recommended that heavy equipment (50kg+) go directly with the wooden crate solution rather than attempting to force the use of corrugated boxes.

Material Four: Composite Materials (High-End and Special Applications)

Composite materials such as paper + plastic + aluminum foil laminated bags are suitable for long-distance sea transportation of food, chemical raw materials, and precision parts. The aluminum foil layer blocks moisture and light, the plastic layer prevents tearing, and the paper layer provides rigidity. The three-layer structure offers far greater protection for the contents than single-layer cartons.

Honeycomb paperboard is another type of high-end composite material. The honeycomb structure delivers compressive strength close to that of solid wood, yet weighs only one-third as much. Using honeycomb board boxes in place of wooden crates for long-distance transport of high-end furniture and home appliances significantly reduces both weight and cost.

Material Selection Comparison Chart (by Scenario)

Domestic road transport within 500 km: B-flute corrugated box + corrugated cardboard buffer, standard PE stretch film; domestic road transport over 500 km: B-flute or EB double-wall corrugated + EPE pearl cotton, moisture-proof corrugated + PE inner liner; sea transport over 7 days: EB double-wall corrugated film-laminated box + PE inner liner + container desiccant; cold chain: B-flute moisture-proof corrugated + PP cushioning material + waterproof label; export heavy-duty: plywood box + internal bracing, IPPC mark.

Common Misconceptions and Pitfall Avoidance Tips

Myth 1: "The thicker, the better." The key to long-distance transport is not material thickness but material matching; overly thick cartons actually increase warehousing and volumetric transport costs. Myth 2: "Plastic is not environmentally friendly." In long-distance moisture-proof scenarios, PE liners are a necessary functional material, and recyclable PE can also reduce costs. Myth 3: "Solid wood is always better than engineered wood." Solid wood carries IPPC compliance costs, and plywood can replace solid wood in most scenarios.

Next Steps

There is no standard answer for material selection in long-distance transportation. The key is to combine four factors: "transportation distance + climate conditions + stacking requirements + whether it is for export." LeXiang Packaging supports sample testing of small-batch long-distance transportation solutions, with a minimum order of 10 corrugated boxes combined with cushioning materials for testing, allowing you to verify the structure and moisture resistance before placing bulk orders.