Corrugated Boxes Go Transoceanic: How DS Smith's Structural Engineering Solves the Dilemma of Long-Haul Fresh Fruit Shipping

Recently, when talking to clients in agricultural exports, the biggest headache remains packaging—especially for delicate fruits like kiwis and grapes that require long-haul transoceanic cold chain transport. A voyage can take over a month, with high humidity and temperature fluctuations inside containers, plus heavy stacking. Traditional cardboard boxes simply can't hold up, often leading to a fallback to reusable plastic crates (RPCs)

However, with the EU's Packaging and Packaging Waste Regulation (PPWR) tightening, market demands for "plastic reduction" are becoming increasingly rigid. While plastic crates are functional, they have become a hot potato for brands, creating a near-deadlock

For delicate fruits on long voyages, are cardboard boxes really hopeless?

In the past, our printing plant's approach to moisture resistance was straightforward: start with materials. We would apply lamination or special coatings to cardboard, trying to keep the moisture out. However, this has several problems:

・High costs, and the subsequent recycling process is more troublesome, which does not fit the spirit of a circular economy

・Limited effectiveness; in extreme humidity on the ocean for over 45 days, even the strongest coating cannot guarantee success

・Physical pressure from stacking is the final straw that breaks the box; this cannot be solved by coatings

Therefore, for a long time, the industry has held a resigned consensus: for long-distance, high-humidity cold chain transport, cardboard boxes are non-starters. At best, they are used for short-haul or air freight with better humidity control. This has made it difficult for many high-quality Taiwanese fruits to break free from the constraints of plastic packaging when exported

The key is not waterproof coatings, but corrugated structural engineering

However, European packaging giant DS Smith recently provided us with a brand-new approach. They developed a "Closed-Type Tray" for kiwi exporters in Greece, directly challenging long-haul transatlantic shipping—and they succeeded

The genius of this tray lies not in some magical waterproof "black technology," but in returning to fundamental "structural engineering." According to data released by DS Smith, key design elements include:

・Closed side walls and an integrated lid: Traditional fruit box sides often have hollowed-out handle holes, which are convenient for handling but also serve as entry points for moisture. This design is almost fully enclosed, cutting off moisture ingress at the source, while using die-cut technology to create ventilation holes in specific locations to ensure the fruit can breathe

・Reinforced corner posts and internal structure: They redesigned the internal support structure of the box, especially making reinforced corner posts at all four corners to significantly increase vertical stacking compressive strength, ensuring it won't be crushed in the ship's hold

・Lightweight and automation: High-quality virgin paper fibers are selected to minimize weight while ensuring strength, increasing load capacity per shipment. Furthermore, the overall tray structure is designed to be compatible with automatic forming machines for rapid assembly, which is critical for production hubs with high shipment volumes

Every year, DS Smith delivers about 1.5 million such trays to customers globally. This is no longer an experiment, but a mature solution verified by the market

Why this is an important lesson for Taiwanese agricultural exports

The DS Smith case study offers several vital insights for Taiwanese printing plants and brand clients

First, it proves that "using structural design to replace chemical coatings" is a feasible and more competitive route. When your packaging is inherently strong and moisture-resistant enough, you don't need to rely on those expensive and environmentally unfriendly extra treatments. This directly responds to the core requirements of EU regulations like the PPWR for "ease of recycling" and "minimization of materials."

Second, this means that the value of packaging plants is no longer just "selling boxes," but providing "solutions." The client's problem is "how to get my kiwis safely to Rotterdam Port," not "give me a waterproof cardboard box." Starting from the client's real pain points and using packaging expertise to solve their business challenges is the key to escaping price wars

Finally, for brands and agricultural exporters, this is an excellent entry point for balancing ESG performance and commercial interests. Adopting this all-paper, recyclable packaging not only reduces carbon footprint and waste disposal hassles but is in itself an excellent marketing story that can resonate with Western consumers sensitive to sustainability issues

・When facing high-humidity environments, the focus of packaging design should shift from "chemical waterproofing" to "physical structure"

・Through structural engineering, corrugated boxes can now replace plastic crates in long-haul sea freight cold chains

・Sustainable packaging is not just about environmental protection; it is a commercial strategy for entering Western markets and enhancing brand value

・The core value of a packaging plant lies in providing engineering capabilities that solve supply chain pain points for clients, rather than merely manufacturing

・Packaging that complies with international regulations such as the PPWR will become a key competitive advantage for Taiwan's product exports

This case has left a deep impression on me. It perfectly embodies the "integrated packaging thinking" that MINDS Printing has always advocated. We should not define ourselves merely as printing manufacturers, but as commercial partners to our clients

For peers in the printing industry, this is both a warning and an opportunity. The warning: if we remain stuck in comparing whose cardboard is cheaper or whose coating is more waterproof, the path will only get narrower. The opportunity: the market is opening up space for higher-value services, namely structural design and packaging consultancy. We should invest in structural design talent, learn to use tools like SolidWorks or ArtiosCAD to simulate and verify, upgrading packaging from "consumables" to "carriers of product protection and brand value enhancement."

For brand owners or designers with export needs, next time you plan product packaging, you can elevate your requirements to the next level. Instead of telling the printing plant what specifications of boxes you want, invite them to explore the supply chain challenges your product will face. A good packaging partner should be able to ask you, "What is the temperature and humidity curve of your container?", "Where is your main target market?", "What local recycling regulations apply?", and tailor a solution for you that balances protection, sustainability, and cost-effectiveness. This is true one-stop service

・A Paper-Based Breakthrough in Fresh Fruit Transatlantic Shipping: How DS Smith's Closed-Type Corrugated Tray Replaces Plastic Crates