One of the most common frustrations for women during menstruation is nighttime leakage. When lying flat, menstrual fluid does not flow downward as it does during the day; instead, it pools at the lowest point of the body—the buttock crease. If the sanitary napkin is flat and uniform, it cannot accommodate this anatomical change, and fluid flows along the body contour toward the back, bypassing the absorbent core entirely. The "Small Pillow" design—a raised, widened, and thickened structure at the rear of the napkin—is engineered precisely to solve this problem.
Anatomy of the "Small Pillow"
The "Small Pillow" is typically a three-dimensional structure located in the back one-third of the sanitary napkin, positioned to align with the gluteal cleft when the user is lying on her back. It is formed through compression molding or by adding an extra layer of absorbent material—either SAP or fluff pulp—to create a raised, pillow-like hump. Unlike the flat body of the napkin, this hump is designed to sit snugly against the contours of the buttocks, adapting to the body's natural curvature.
⭐Design Parameters: What Makes an Effective "Small Pillow"
For the design to function effectively, several parameters must be optimized:
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Height: Typically 5–8 mm above the surrounding pad surface. Too low, and the barrier effect is insufficient. Too high, and the pillow becomes uncomfortable during sitting.
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Position: The center of the pillow should align with the natural position of the gluteal cleft, generally located 5–7 cm from the rear edge of the pad.
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Absorbency density: The pillow is typically 20–30% more absorbent by volume than the rest of the core, ensuring that it can effectively compete for fluid flow without becoming saturated prematurely.
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Compression resistance: The pillow must maintain its height under pressure to remain effective. Using high-spring-back fibers or multi-layer core design helps retain the cushion effect.
Performance Benefits
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Reduced rear leakage: By blocking the main flow path toward the rear, the "Small Pillow" significantly reduces the incidence of leakage in the back.
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Better fluid distribution: Rather than concentrating at the back, fluid is directed back toward the center of the core, utilizing the entire length of the pad more efficiently.
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Enhanced comfort: The raised, soft structure conforms to the buttocks, providing a cushioning sensation that reduces lateral movement during sleep.
Why This Matters for Procurement
For buyers, the presence and quality of the "Small Pillow" design—whether through a simple SAP "pillow" or a complex multi-layer core—is a key indicator of product quality and market positioning. Products incorporating this design are positioned as premium overnight solutions, commanding higher margins and delivering better user experiences, directly translating to lower complaint rates and stronger brand loyalty.
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