In disposable diapers, Clothlike Film is one of the core materials, mainly used for BackSheet, and its design needs to balance waterproofness, breathability, flexibility, and durability. The following are typical features and functional descriptions:
1. Basic structure and composition
Composite films are usually composed of multiple layers of materials, and common structures include:
Outer layer: PE thin or non-woven fabric, providing basic strength and printing surface.
Intermediate functional layer: microporous breathable membrane (such as PE/TPU), water-resistant coating or nanofiber layer, achieving breathability and leak prevention.
Inner layer (hot melt adhesive layer): bonded to non-woven fabric or absorbent core to ensure structural integrity.
2. Key performance characteristics
(1) Waterproof and leak proof properties
Completely blocking liquids: preventing urine penetration through dense PE film or hydrophobic coating.
Anti leakage design: edge embossing or elastic composite structure (such as adding elastic fibers) enhances sealing.
2) Breathability (moisture permeability)
Microporous technology: PE/PP membranes form micropores (pore size 0.1-10 μ m) through physical stretching or chemical foaming, allowing water vapor to pass through but blocking liquid water.