In cold storage environments, low temperatures coexist with high humidity. Frequent movement of goods easily leads to condensation and frost on surfaces. This not only tests the moisture resistance of packaging but also poses extremely high demands on anti-slip safety. The reason PP hollow board turnover boxes have become the "standard choice" for cold chain environments mainly benefits from the "black technology" in their material formulations and structural designs:
1. Core Logic of Moisture-Proof & Water-Resistant
Inherent "Zero Water Absorption" of the Material: PP hollow boards are primarily made of polypropylene (PP), a polymer with an extremely low water absorption rate (typically less than 0.01%). This means water molecules cannot penetrate the molecular gaps to enter the interior of the board, fundamentally eliminating issues like softening, swelling, or mold growth caused by water exposure, which are common in traditional cardboard boxes.
Smooth Surface & Rounded Corner Design: The surface of the hollow board is flat and smooth, and the boxes are usually designed with rounded corners, leaving no dead corners where water can accumulate. Condensation can only form into water droplets or films on the surface, unable to adhere or stay in place. They can be wiped off or naturally slide away, keeping the box dry.
Low-Temperature & Anti-Embrittlement Formula: Cold storage temperatures are typically -18°C or even lower, and ordinary plastics easily become brittle and crack. High-quality PP hollow boards incorporate specialized low-temperature toughening agents, allowing them to maintain excellent flexibility and impact strength even in extreme low temperatures of -30°C to -40°C. This ensures the box won't develop cracks due to embrittlement, preventing moisture from intruding through gaps.
2. Structure & Craftsmanship for Anti-Slip & Anti-Icing
Anti-Slip Texture Design at the Bottom: To prevent sliding during stacking in cold storage or automated handling, the bottom of the turnover box is usually designed with anti-slip textures, anti-slip feet, or grid patterns. This physical structure increases the friction between the box and pallets or shelves, ensuring stacking stability even when there is slight moisture on the surface.
Drainage Holes & Water-Draining Design: Addressing the common condensation issue in cold storage, some turnover boxes feature drainage holes or water-draining textures at the bottom. When a box is moved from a low-temperature zone to a normal-temperature zone and generates condensation, the water can flow smoothly along the box to the bottom and be quickly drained away, preventing water accumulation from soaking the goods or icing up at the bottom.
Anti-Slip Additives & Surface Treatment: During the material modification stage, manufacturers add anti-slip masterbatch or elastomers (such as TPE) to improve the friction coefficient of the plastic surface. Additionally, some high-end cold chain turnover boxes use anti-fog coatings to reduce surface tension, causing condensation to form a uniform water film rather than droplets. This accelerates evaporation and reduces the risk of icing.
In summary, through the combination of "water-resistant material + anti-slip structure + low-temperature formula," PP hollow board turnover boxes perfectly solve the pain points of moisture-proofing and anti-slipping in cold storage environments, ensuring the safety and efficiency of cold chain logistics.
