Composition Materials of Baby Diapers

Baby diapers are designed to be highly absorbent, comfortable, and safe for a baby's delicate skin. They consist of multiple layers, each serving a specific function. The main components and materials used in baby diapers are as follows:

1. Top Sheet:

- Material: Polypropylene or polyethylene non-woven fabric.

- Function: This is the layer in direct contact with the baby's skin. It is designed to be soft and to wick moisture away quickly, keeping the skin dry.

2. Absorbent Core:

- Material:

Superabsorbent Polymer (SAP): Typically made of sodium polyacrylate, which can absorb and retain large quantities of liquid.

Fluff Pulp: Usually made from wood cellulose fibers, which provides bulk and aids in the distribution of liquids.

-Function: The core is responsible for absorbing and retaining urine. The combination of SAP and fluff pulp ensures quick absorption and prevents leakage.

3. Distribution Layer:

- Material: Often made of a blend of synthetic and natural fibers.

- Function: Helps distribute the liquid evenly throughout the absorbent core to avoid pooling and ensure even absorption.

4. Back Sheet:

-Material: Polyethylene film or a breathable laminate made of polyethylene and polypropylene.

- Function: This outer layer prevents liquids from leaking out of the diaper. Some back sheets are designed to be breathable to allow air circulation, which helps reduce the risk of diaper rash.

5. Elastic Components:

- Material: Spandex or other elastic materials.

- Function: These are used in the leg cuffs, waistbands, and sometimes in the sides of the diaper to provide a snug fit and prevent leaks. The elasticity ensures the diaper stays in place during movement.

6. Adhesive Tapes/Fasteners:

-Material: Polypropylene or polyester, often with a hook-and-loop or adhesive mechanism.

-Function: These are used to secure the diaper around the baby's waist. They are designed to be re-fastenable to allow for adjustments and to check for soiling.

These materials are carefully chosen to balance absorbency, comfort, safety, and cost. The design and materials used in baby diapers are continually evolving to improve performance and reduce environmental impact.