Which property of PE flat FDY yarn can make people feel the cooling effect when touching it?

The reason why PE flat FDY yarn can bring a cooling effect when touched is mainly due to the physical structure and material properties of the product, as well as possible subsequent processing technology. A notable feature of PE (Polyethylene) flat FDY yarn is that its cross-sectional shape is flat, unlike traditional round fibers. This design not only gives the fiber a unique appearance and luster, but more importantly, the flat shape increases the contact area between the fiber and the skin. A larger contact area means that more heat can be quickly conducted through the fiber surface, thereby improving heat dissipation efficiency.
PE flat FDY yarn is often made using microfiber technology, that is, the fiber diameter is relatively small. Microfibers have a higher surface area (surface area to volume ratio), which helps to dissipate heat faster. At the same time, the microfibers are arranged closely and orderly, forming a good heat conduction channel, further enhancing its heat dissipation performance.
The PE material itself has a certain degree of hygroscopicity and can absorb and quickly evaporate trace moisture on the skin surface. This process will take away a lot of heat, thus creating a cool feeling. In addition, the thermal conductivity of PE material is moderate. It will neither absorb heat too quickly to cause overheating, nor release heat too slowly to affect the heat dissipation effect.
To further enhance the cool touch of PE flat FDY yarn, manufacturers may add cool finishing agents during fiber production or fabric processing. These additives usually contain special materials with high water absorption, such as inorganic nanoparticles or high molecular polymers such as alumina and silicate, which can form a thin cooling layer on the fiber surface. When human skin comes into contact with this cool layer, due to the high specific heat capacity of the material, it can quickly absorb and disperse the heat released by the skin, thus producing an immediate cool feeling.
The cooling effect of PE flat FDY yarn is the result of multiple factors. Its flat cross-section design increases the contact area with the skin, and the microfiber structure improves the heat dissipation efficiency. The moisture absorption and heat dissipation properties of the PE material and the possible cool finishing treatment further enhance this feature. These factors work together to make PE flat FDY yarn have a significant cooling effect when touched, which is particularly suitable for summer clothing, outdoor products, sports equipment and other fields that require good breathability and cool touch.