Sanitary Napkins Raw Material Composition and Properties

# Sanitary Napkins Raw Material Composition and Properties

Sanitary napkins are essential personal care products designed to provide comfort and hygiene during menstruation. Understanding the raw materials used in their production is crucial for ensuring quality and safety. 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 menstrual fluid. It is typically made from a blend of wood pulp and superabsorbent polymers (SAP).

### Properties:

– High Absorbency: The core can absorb and retain large amounts of liquid, preventing leakage.
– Softness: The materials used are soft to ensure comfort during use.
– Breathability: The core allows air to circulate, reducing the risk of irritation.

## 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.

### Properties:

– Softness: The top sheet is designed to be gentle on the skin.
– Quick-Drying: It allows menstrual fluid to pass through quickly, keeping the surface dry.
– Hypoallergenic: Materials are chosen to minimize the risk of allergic reactions.

## 3. Back Sheet

The back sheet is the outermost layer of the sanitary napkin, providing a barrier to prevent leakage. It is commonly made from polyethylene or polypropylene films.

### Properties:

– Waterproof: The back sheet prevents menstrual fluid from leaking through.
– Flexibility: It is flexible to conform to the body’s shape, ensuring a secure fit.
– Durability: The material is strong enough to withstand wear and tear during use.

## 4. Adhesive

Adhesive is used to secure the sanitary napkin to the underwear. It is typically a pressure-sensitive adhesive applied to the back sheet.

### Properties:

– Strong Adhesion: The adhesive ensures the napkin stays in place during movement.
– Residue-Free: It should not leave any sticky residue on the underwear.
– Skin-Friendly: The adhesive is formulated to be gentle on the skin.

## 5. Release Paper

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

### Properties:

– Easy Removal: The release paper can be easily peeled off without damaging the adhesive.
– Smooth Surface: It provides a smooth surface for the adhesive to adhere to the underwear.
– Durability: The paper is strong enough to protect the adhesive during storage and handling.

## Conclusion

The raw materials used in sanitary napkins are carefully selected to ensure optimal performance, comfort, and safety. Each component, from the absorbent core to the release paper, plays a vital role in the overall functionality of the product. Understanding these materials and their properties helps in making informed choices and appreciating the technology behind everyday personal care products.