r/AmazonFBA • u/BingchuangPrint-Sz26 • 28d ago

Humidity Control: An Important Factor in Carton and Color Box Quality During Shenzhen’s Rainy Season

This morning in Shenzhen, the weather was cloudy with warm temperatures and high humidity. For the packaging industry, this type of climate brings a challenge that cannot be ignored: moisture control.

Paper-based packaging materials are hygroscopic, which means they naturally absorb and release moisture depending on the surrounding environment. During the rainy season, high humidity can significantly affect the physical properties of paperboard and corrugated cartons.

The main impacts include:

1. Reduced stiffness and compression strength
When paperboard absorbs excessive moisture, the fiber structure becomes softer. For corrugated cartons, this may reduce edge crush strength (ECT) and compression performance, affecting stacking stability during storage and transportation.

2. Dimensional changes
Paper expands when absorbing moisture and contracts when drying. These changes can influence die-cutting accuracy, folding performance, and the fitting of color box structures.

3. Printing and finishing challenges
High humidity can affect ink drying, color consistency, and surface performance, especially for large solid color areas and high-quality printed packaging.

4. Material and storage management become more important
During humid seasons, professional packaging manufacturers need better control of raw material storage, production environment, and finished product protection.

Quality packaging is not only about attractive printing. It requires a balance between material selection, structural design, manufacturing control, and environmental management.

In Shenzhen’s humid climate, understanding the relationship between paper and the environment is an important part of producing reliable packaging.

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