Why microfiber is good for mask face

Kao's Skin Care Research Laboratory, Cosmetic Research Laboratory and Analytical Science Laboratory have joined forces to analyze the skin-protecting function of microfiber films. The technology creates a light, soft, natural-looking ultra-film on the skin's surface by directly spraying ultra-fine fibers up to sub-micron in diameter. This film of fine fibers prevents pollen, PM2.5, etc. from coming into contact with the skin, and also adsorbs sebum secreted by the skin. Dirt and excess sebum attached to the film can be removed by simply peeling off the film.
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Research background

The skin is located in the outermost layer of the body and is constantly affected by the environment and external factors. In recent years, people all over the world have become more aware of protection against air pollution. Under the influence of the epidemic, many people complain of deteriorating skin conditions after wearing masks, which has become a constant and intractable nuisance for many people in today's world.
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"Microfiber technology", is the formation of an ultra-thin film on the skin formed by the intersection of ultra-fine fibers with a diameter of sub-microns. The functions of this ultra-thin film include (1) keeping the skin in good condition by controlling the transpiration of water from the surface of the skin when the skin is covered by the ultra-thin fiber film, and (2) smoothing the skin, covering spots, and obtaining a higher degree of radiance by applying a basic cosmetic product to the ultra-thin fiber film. This study then examined the structure of the microfiber film and how it protects the skin.

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Highlights of the study

(1) The average diameter of the tiny slits formed by the interlocking microfibers is 1.8 microns.

The membrane has a three-dimensional structure of interlaced microfibers that contain numerous tiny slits. In this study, the size (pore diameter distribution) of these tiny voids was measured using a porosimeter (indicated by the red part in Fig. 1). The results confirmed that the pore size of this fiber membrane is about 1.8 microns, which can capture PM2.5 compared to the size of atmospheric pollutants (dirt).

(2) Protecting the skin environment and inhibiting the adhesion of atmospheric pollutants to the model skin to form a fine fiber membrane, changes in the adhesion of atmospheric pollutants (dirt), such as pollen, dust, graphite, and PM2.5, were observed with an electron microscope. The images confirmed that these atmospheric pollutants were retained within the interstices of the fine-fiber membrane or at the top of the membrane (Fig. 3). In addition, removal of the membrane to which these particles (dirt) were adhered almost completely removed the atmospheric pollutants from the model skin. Thus, the fine-fiber membrane formed on the skin acts as a filter, capturing various pollutants and preventing them from adhering to the skin.

(3) External environmental protection to reduce abrasion and frictionWhen a microfiber film forms on the skin, it has a protective effect against physical irritants such as abrasion and friction.Male and female volunteers between the ages of 20 and 30 years old were asked to apply the mask and keep it on for four hours after applying cosmetics. One side was the comparison group and a microfiber membrane was introduced on the other side. The degree of wear was visualized and quantified by comparing the skin on both cheeks after application and after 4 hours of application. The results showed that the microfiber film and the applied make-up remained on the cheeks even 4 hours after removal of the mask; whereas on the side where the microfiber film was not applied, most of the film formed by the formulation had disappeared. This indicates that the microfiber film formed on the skin not only maintains the residence time of the cosmetic formulations, but also reduces the abrasion and friction caused by the mask.

(4) Removal of sebum secreted on the skin Past studies have shown that microfiber films have a high capillary force due to their porous structure. This leads to the expectation that sebum secreted by the skin may be adsorbed on the inner surface of the membrane. Microfiber membranes were applied to one cheek of 29 women aged 20 - 50 years, and sebum was wiped and collected from both cheeks after 4 hours, and sebum content was quantified by liquid chromatography-mass spectrometry (LC/MS). The results showed that more sebum residue was collected on the cheeks to which no microfiber was applied.Quantitative analysis of the fiber membrane by LC/MS also showed that approximately 70% of the secreted sebum was transferred to the membrane .
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Conclusion.

The present study showed that microfiber membranes prevented the direct action of atmospheric pollutants such as pollen, dust, and PM2.5 on the skin, protected the skin from physical irritants such as abrasions, and trapped excess sebum through the inner membrane. Dirt and excess sebum attached to the membrane can be easily removed by physically peeling off the fiber membrane.