The barrier function of surface coatings in paper tube packaging

Prevention of Water Penetration: Surface coatings create a physical barrier on the outer layer of the paper substrate, preventing water molecules from penetrating into the paper fibers. This barrier effectively blocks moisture ingress from external sources such as humidity, rain, or accidental spills.

Reduction of Water Vapor Transmission: In addition to repelling liquid water, surface coatings also hinder the passage of water vapor through the paper substrate. Water vapor transmission can occur through the pores and gaps in the paper structure, but the barrier function of coatings reduces this transmission, thereby minimizing the effects of high humidity environments.

Resistance to Capillary Action: Capillary action, the tendency of liquids to move through narrow spaces in opposition to gravity, can lead to moisture wicking into the paper substrate. Surface coatings with low surface energy inhibit capillary action, preventing water from being drawn into the paper and maintaining its moisture resistance.

Protection Against Surface Wetting: When water comes into contact with the surface of paper tube packaging, uncoated paper tends to absorb moisture, causing it to become wet and potentially compromising its structural integrity. Surface coatings, especially hydrophobic ones, repel water droplets, preventing them from wetting the paper surface and maintaining its dryness.

Enhanced Durability: By forming a protective layer over the paper substrate, surface coatings improve the durability and longevity of paper tube packaging. They shield the paper from degradation caused by exposure to moisture, preventing issues such as warping, weakening, or mold growth, which can compromise the integrity of the packaging and the quality of the enclosed products.

Barrier to Contaminants: In addition to moisture, surface coatings can also act as barriers against other contaminants such as grease, oils, dust, and microorganisms. This ensures that the packaged products remain clean, safe, and free from external contaminants throughout their lifecycle.

Preservation of Product Quality: The barrier function of surface coatings preserves the quality and freshness of the packaged products by protecting them from moisture-related damage. This is particularly important for sensitive items such as food, pharmaceuticals, and electronics, where exposure to moisture can lead to spoilage, degradation, or malfunction.