Sanitary Napkins Raw Material Composition and Properties

# Sanitary Napkins Raw Material Composition and Properties

Sanitary napkins are essential feminine hygiene products designed to provide comfort and protection during menstruation. Understanding the raw materials used in 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 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 locking in moisture.

### Properties:

– High Absorbency: The core can absorb and retain large amounts of liquid.
– Softness: Ensures comfort during use.
– Quick Absorption: Prevents leakage by rapidly absorbing fluid.

## 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 primary function of the top sheet is to allow quick passage of menstrual fluid to the absorbent core while keeping the surface dry.

### Properties:

– Soft and Smooth: Prevents irritation and provides comfort.
– Breathable: Allows air circulation to reduce moisture buildup.
– Hydrophilic: Facilitates quick fluid transfer to the absorbent core.

## 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 menstrual fluid from leaking through.
– Flexible: Allows the napkin to conform to the body’s shape.
– Durable: Resists tearing and maintains integrity during use.

## 4. Adhesive

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

### Properties:

– Strong Adhesion: Ensures the napkin stays in place.
– Skin-Friendly: Hypoallergenic to prevent skin irritation.
– Residue-Free: Leaves no sticky residue on underwear after removal.

## 5. Release Paper

Release paper covers the adhesive before use. It is typically made from silicone-coated paper or film, which allows easy removal without damaging the adhesive.

### Properties:

– Easy to Remove: Facilitates quick and hassle-free application.
– Durable: Protects the adhesive until the napkin is ready for use.
– Non-Stick: Prevents the adhesive from sticking prematurely.

## 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 can help consumers make informed choices and appreciate the engineering behind these essential hygiene products.