Sanitary Napkins Raw Material Composition and Properties

# Sanitary Napkins Raw Material Composition and Properties

Sanitary napkins are essential hygiene products used by women worldwide. Understanding the raw materials that go into their production is crucial for both manufacturers and consumers. This article delves into the composition and properties of the primary materials used in sanitary napkins.

## 1. Absorbent Core

The absorbent core is the heart of a sanitary napkin, responsible for absorbing and retaining menstrual fluid. It is typically made from a blend of wood pulp and superabsorbent polymers (SAP). Wood pulp provides bulk and structure, while SAP enhances the absorbency by turning liquid into gel.

### Properties:

– High Absorbency: The core can absorb several times its weight in liquid.
– Softness: Ensures comfort during use.
– Quick Absorption: Rapidly draws in liquid to prevent leakage.

## 2. Top Sheet

The top sheet is the layer that comes into direct contact with the skin. It is usually made from non-woven fabrics or perforated films. The material is chosen for its softness, breathability, and ability to keep the skin dry.

### Properties:

– Soft and Smooth: Prevents irritation and chafing.
– Breathable: Allows air circulation to reduce moisture buildup.
– Hydrophobic: Repels liquid to keep the surface dry.

## 3. Back Sheet

The back sheet is the outermost layer of the sanitary napkin, designed to prevent leakage. It is typically made from polyethylene or polypropylene films, which are waterproof and flexible.

### Properties:

– Waterproof: Prevents leakage and protects clothing.
– Flexible: Allows the napkin to conform to the body’s shape.
– Durable: Resists tearing and puncturing during use.

## 4. Adhesive

Adhesive is used to secure the sanitary napkin to the underwear. It is usually a pressure-sensitive adhesive that provides a strong yet gentle hold.

### Properties:

– Strong Adhesion: Ensures the napkin stays in place.
– Gentle Removal: Easy to remove without leaving residue.
– Hypoallergenic: Safe for sensitive skin.

## 5. Release Paper

Release paper is a protective layer that covers the adhesive before use. It is typically made from silicone-coated paper or film.

### Properties:

– Easy to Peel: Allows for quick and easy application.
– Protective: Keeps the adhesive clean and effective.
– Disposable: Can be easily discarded after use.

## Conclusion

The raw materials used in sanitary napkins are carefully selected to ensure comfort, effectiveness, and safety. Each component plays a vital role in the overall performance of the product. Understanding these materials and their properties can help consumers make informed choices and manufacturers improve their products.