Why Must the "Substrate" and "Liquid Formulation" of Wet Wipes Be Precisely Matched?

2026-07-02

Why Must the "Substrate" and "Liquid Formulation" of Wet Wipes Be Precisely Matched?

A wet wipe is far more than just "nonwoven fabric dipped in water." Over 90% of a wet wipe's performance experience depends on the "chemical interaction" between the substrate (nonwoven fabric) and the liquid formulation. Choose the wrong substrate, and even the best essence liquid will fail to deliver; formulate the wrong liquid, and even the most expensive nonwoven will remain merely a "wet piece of cloth." The precise matching of the two is the dividing line between a product that is merely "usable" and one that delivers a truly superior experience.

I. Characteristics of the Three Major Substrates — Who Absorbs and Who Releases?

There are three main types of wet wipe substrates currently on the market:

Polyester fiber is a petrochemical-based synthetic fiber with a smooth surface and strong hydrophobicity, showing weak affinity for water-based liquids. Its strengths lie in high strength, abrasion resistance, and low linting. However, liquid absorption relies primarily on capillary effects between fibers rather than absorption by the fiber itself. This means it "absorbs quickly and releases quickly" — liquid attaches to the fiber surface and interstitial spaces, and is easily released under pressure, with limited liquid-holding capacity. It is commonly used in general-purpose wipes that emphasize cleaning power but aim for low cost.

Viscose fiber is a regenerated cellulose fiber that is naturally hydrophilic. Its surface contains abundant hydroxyl groups capable of forming hydrogen bonds with water molecules, giving it a natural affinity for water-based formulations. It absorbs not only through capillary structure but also through fiber swelling, offering high liquid retention and uniform release. However, viscose has low wet strength — when wetted, if the liquid contains certain electrolytes or surfactants, fiber strength may further decrease, a factor that must be considered in formulation design.

Wood pulp fiber is also a hydrophilic natural fiber, but it is short, has low rigidity, and swells rapidly upon water absorption, providing exceptional liquid-holding capacity. Its drawback is poor wet structural stability, making it prone to linting during use. It is often blended with polyester to balance absorption performance and strength, commonly found in kitchen cleaning, industrial wiping, and other similar applications.

⭐ Formulation designers must adjust thickeners, surfactant systems, and preservative concentrations based on the fiber chemistry of the substrate, so that the final product achieves a balance among "liquid content upon opening," "release rate during wiping," and "residual skin feel after wiping." Neglecting this matching either results in excessive liquid remaining in the packaging while the nonwoven feels "dry," or liquid flowing everywhere during wiping, creating a poor user experience. In short: The substrate determines the "skeleton," and the formulation determines the "soul" — choose the wrong skeleton, and the soul has nowhere to rest; mismatched formulation, and the skeleton is rendered meaningless.

II. How Formulation Components "Choose" Substrates — The Logic of Absorption and Release Matching

Liquid formulations are not a single liquid but a multi-component system consisting of emollients (glycerin, propylene glycol, etc.), preservatives (phenoxyethanol, potassium sorbate, etc.), surfactants, pH adjusters, and purified water. Different components exhibit distinctly different absorption and release behaviors on different substrates.

Absorption matching: The hydrophilic hydroxyl groups of viscose and wood pulp have a strong binding affinity for polyols such as glycerin, allowing emollient components to stably attach to the fibers and deposit effectively onto the skin during wiping. Polyester, however, shows almost no absorption of these components — if the formulation contains high levels of emollients, most will be lost inside the packaging or released rapidly at a single spot during wiping, leading to uneven application and sticky skin feel. Preservatives face a similar issue: if a preservative is excessively adsorbed by the substrate (for example, certain cationic preservatives show significantly higher retention on viscose than on polyester), the free preservative concentration in the liquid phase becomes insufficient, leading to microbial growth after the wipe is opened and a substantially shortened shelf life.

Release matching: Release that is too fast causes excess liquid to pour out during wiping, leading to waste and dripping; release that is too slow results in insufficient cleaning and a dry, uncomfortable feel. Viscose substrates exhibit a relatively gentle "absorption-release" curve, making them suitable for baby care, facial care, and other scenarios requiring a mild, moist experience. Polyester substrates release liquid concentrated in the initial stage, making them more suitable for industrial or surface cleaning. Wood pulp substrates release evenly but have a large liquid-carrying capacity, suitable for high-liquid-content products.

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