The history of feminine sanitary napkins reflects social evolution, advancements in medical and health technology, and the dynamics of female emancipation. The following summarizes the essential stages, from origins to recent innovations.
1. History and product evolution
1.1 Before modern napkins: historical management
For centuries, women had to adopt artisanal solutions to manage menstrual flow, varying by culture and material conditions.
These methods were often unhygienic, uncomfortable, and costly to maintain, significantly affecting freedom of movement and social participation.
1.2. The birth of the disposable feminine sanitary napkin
The concept of a disposable pad arose from wartime necessity.
A. The inventors: nurses and soldiers
- Historical context: the breakthrough occurred during world war i.
- Innovation: the material cellucotton, originally intended for treating soldiers’ wounds, proved highly absorbent and single-use. Nurses adopted it for menstrual management, recognizing its superior absorbency compared to cotton.
B. The first commercial napkins
- Launch: in 1921, in the united states, the first disposable sanitary pad, kotex (derived from cotton + texture), was introduced.
- Problem and solution: initially, the product struggled to sell. Cultural stigma prevented women from requesting it from male pharmacists. a self-service system was introduced to enable anonymous purchase.
1.3. Evolution and changes to today
1.4. Global availability: the period poverty crisis
Disposable napkins are widely available in industrialized and emerging economies, but economic access remains a significant barrier.
- Limited availability areas: some regions in developing countries lack reliable distribution.
- Period poverty: many women cannot afford adequate hygiene products, resorting to improvised solutions.
- Consequences: school absenteeism, reduced social participation, and health impacts, affecting human rights.
2. Technical focus: printing on the sanitary napkin
2.1. Curiosities and anecdotes about printing
A. The blue color (“blue core”): historically adopted in visual and television communication, blue became a symbol of absorbency. Integrating the color into the product reinforced reliability perception.
B. The printed line: function and design
The central line or motif serves three functions:
- Usage guide: indicates correct orientation and positioning of the product.
- Flow distribution (functional marketing): emphasizes embossing channels that physically guide the fluid.
- Production quality control: in high-speed production lines, printing allows optical sensors to verify alignment.
C. Ink safety: since printing is on the top-sheet, inks must comply with strict regulations for indirect skin contact. Water-based, skin-safe or food-grade inks are used. formulations balance color performance with chemical inertness, avoiding solvents and VOCs.
D. Evolution of printed design: from the late 1990s, pads were reimagined as “intimate” rather than “medical” items, introducing:
- decorative motifs (flowers, arabesques),
- patterns inspired by lingerie textiles,
- soft colors for a less clinical aesthetic.
E. Inline printing in high-speed production: in integrated lines, ink is applied in-line on the top-sheet using flexographic techniques. Deposition occurs in milliseconds, ensuring:
- extremely precise alignment,
- instantaneous drying,
- no contamination of subsequent layers.
2.2. Flexography vs inkjet
Flexography is superior to inkjet for sanitary napkin production due to very high speed, lower operating costs, and perfect integration with high-productivity converting lines. The anilox roller ensures low ink consumption and uniform prints, ideal for guides and decorative motifs. Rapid-drying inks (hot air, IR, or UV) prevent process slowdowns. inkjet, conversely, has higher costs, alignment difficulties, and offers no real advantages for repetitive graphics.
2.3. Production speed
Sanitary napkin production lines are among the fastest in the cellulose and nonwoven sector.
- Standard lines: up to 350–500 pieces per minute (ppm).
- High-speed lines: ultra-thin pads exceed 1,200 ppm.
- Panty-liners: simpler products can exceed 1,500 ppm.
These speeds are achieved through:
- full-servo architectures,
- automatic splicers for “no-stop” roll changes,
- advanced artificial vision systems for 100% inspection.
2.4. Printing placement
Printing, including positioning guides or decorative motifs, is usually done on the top-sheet (facing the adl and absorbent core).
- technical reason: minimize skin exposure to inks, even if safe.
- aesthetic result: top-sheet translucency allows the motif to remain visible.
3. Social and legal context of design
3.1. Controversies and notable cases
A. Fragrances and floral motifs (2000s): many brands introduced printed floral motifs and fragrances. gynecologists and consumers warned that in warm, humid environments, dyes and fragrances could increase allergy and fungal infection risks. Consequently, companies removed fragrances and reduced ink use in sensitive-skin lines.
B. Wings and shape patent: patents on functional shape and design, including embossing and printed lines, were subject to major legal disputes, highlighting printing as a functional identification element.
C. Azo dyes and material safety: independent tests raised concerns over azo dyes due to potential release of aromatic amines. The industry transitioned to certified inks free from potentially harmful substances.
D. Debate over blue liquid: prolonged use of blue liquid in advertising was criticized as euphemizing menstrual physiology. Introducing real red liquid in some campaigns was seen as a step toward more authentic, stigma-free representation.
4. Emerging trends and future perspectives
- The future of sanitary pads increasingly focuses on sustainability, replacing petroleum-based polymers with plant-based and fully biodegradable bioplastics.
- Wearable technology pads are being developed to monitor menstrual flow, reproductive health, and detect anomalies or infections.
- Demand for reusable products is growing, including washable pads and menstrual underwear (“period panties”).
- “Smart” products are emerging that automatically adjust absorbency based on cycle day or activity, using materials with variable reactivity.
Written by Annalisa P. | Team Giugni®
