How does the EB pit packaging inner box prevent bottom products from being compressed and deformed during multi-layer stacking during transportation?
Publish Time: 2025-08-14
In modern logistics and supply chain systems, goods often undergo complex processes such as long-distance transportation, multi-layer stacking, and warehouse turnover. This is particularly true in e-commerce, retail, and industrial product distribution. Boxes are stacked layer by layer in warehouses, with the bottom packaging bearing the immense pressure of the upper layers. Inadequate packaging structure can easily lead to box collapse and inner box deformation, resulting in damage to the product inside, cosmetic damage, and even functional failure. The EB pit packaging inner box, with its unique composite corrugated structure and excellent compressive resistance, is a reliable solution for preventing product compression and deformation.
1. Analysis of the EB pit structure: The advantages of combining E-type and B-type corrugation
"EB pit" refers to a double-layer corrugated cardboard structure created by combining E-type and B-type corrugation through a composite process. Among them:
E-type corrugation: Features a small flute height, high density, excellent flatness and stiffness, and a smooth surface. It is ideal for high-precision printing and fine die-cutting, and is often used for outer boxes or display surfaces.
B-type corrugated paper: With a moderate flute height, it offers excellent compressive strength and cushioning properties, particularly well-suited to resisting vertical pressure.
Combining the two, EB corrugated paperboard combines the high surface quality of E-type with the strong compressive resistance of B-type, resulting in a structural characteristic of "flat exterior and tough interior." This design not only increases the overall thickness and rigidity of the paperboard, but also significantly enhances its vertical load-bearing capacity, effectively distributing and absorbing upward pressure in multi-layer stacking, preventing localized collapse.
2. High compressive strength to withstand long-term static loads
In warehouse environments, bottom-layer packaging often faces the continuous pressure of several or even dozens of layers of cargo above it for extended periods of time. EB corrugated inner boxes, due to their double-layer corrugated structure, possess significantly higher ECT and bursting strength than single-layer E- or B-corrugated paperboard. Experimental data shows that, under the same grammage, EB corrugated paperboard can improve its compressive performance by 30%–50%, easily handling the pressure of stacking more than five standard boxes, ensuring that the bottom inner box maintains its deformation and corner collapse, providing stable support for the products inside.
3. Strong Structural Stability, Preventing Sidewall Extrusion and Deformation
Ordinary thin-walled inner boxes are prone to bulging or sidewall concavity when subjected to pressure, causing product displacement or friction damage. However, the increased thickness of EB corrugated inner boxes (typically between 3.5–5mm) significantly enhances sidewall rigidity, effectively resisting lateral compression. Even if the outer box deforms slightly due to stacking pressure, the inner box maintains its original shape, creating a "double-protection" structure that is particularly suitable for fragile or high-value products such as glassware, electronics, and cosmetics.
4. Customizable Inner Support Design for Point-to-Point Support
EB corrugated cardboard can be used not only for flat inner boxes but also for custom-shaped inner supports, partitions, slots, or cushions through die-cutting, creasing, and folding processes. These customized structures precisely conform to product contours, providing localized support at critical stress points (such as corners and bottoms), evenly distributing external pressure throughout the inner box structure and preventing stress concentration that could cause product damage. For example, when packaging mobile phones, cameras, or bottled alcohol, the EB pit inner box can be designed with a suspended bottom or ring-shaped corner protectors, allowing the product to "float" within the box and completely isolate it from external pressure.
5. Excellent Resilience and Dynamic Cushioning
In addition to static compressive resistance, EB pit paperboard also exhibits excellent elastic recovery. When subjected to bumps, vibrations, or sudden impacts during transportation, its corrugated structure acts like a "micro-spring" to absorb energy, reducing the vibration amplitude transmitted to the product. This dynamic cushioning property, combined with static compressive resistance, comprehensively enhances the inner box's level of protection.
6. Environmentally Friendly and Recyclable, Balancing Performance and Sustainability
EB pit inner boxes are made from virgin wood pulp or a high percentage of recycled paper pulp, meeting environmental standards and are recyclable and biodegradable. They deliver high-strength protection without adding an environmental burden, meeting brand owners' pursuit of green packaging.
In summary, the EB pit packaging inner box, through its composite corrugated structure, high compressive strength, excellent stiffness, customized support design, and excellent resilience, demonstrates superior compressive protection during multi-layer stacking and transportation. It not only effectively prevents the bottom product from deformation and damage due to pressure, but also improves the grade and reliability of the overall packaging. It is an indispensable "invisible guardian" in modern high-end product packaging.
