What is cool fabric? Today, Xiaobian brings you the knowledge of science related to cool fabrics! With the global “greenhouse effect†intensifying, people are demanding more cool summer clothes, moisture absorption and quick drying, and developing new types. The cool fabrics are very loud. The cool feeling, the accurate name is "contact moment cool feeling". The instant coolness of contact here refers to the instantaneous contact of the skin with the fabric below its temperature, causing rapid loss of heat on the surface of the skin, a drop in temperature, and a cooling sensation formed by the temperature-sensitive nerve endings in the skin. “Cool Sensation†was originally a concept costume. Internationally, first of all, it was developed by Japan, but the purpose of Japan is to achieve energy-saving purposes through the cool sensation, and to form a national movement in Japan to slow the sustainability of global warming. Then, a man-made fiber called Cupro respiratory fiber was developed and had a deodorizing function. Then the United States improved Japanese technology and developed a new patent for cold-sensing fabrics. In 2011, it was officially officially registered as CoolCoreTM, which is now the sports brand introduced by China Xinyong International. The cool fabric has the characteristics of moisture wicking, dryness and coolness, instant cooling, etc. When it comes into contact with the human body, it can quickly extract the moisture and heat of the skin surface, keep the skin surface dry and cool, and make the clothes become the natural body air conditioner, making people hot. In the summer, add a little cool and feel more refreshing and beautiful. This is a new initiative in sportswear and outdoor casual wear fabrics. The cool sensation fiber is extracted and nano-technology, preferably modified with natural jade powder and shell powder, mica powder and other natural mineral materials, and processed into nano-sized particles, and then processed with a hydrophilic slice by spinning. Through the design of the fiber cross-section, the fiber has a "capillary effect" to enhance the heat dissipation speed. The cooling performance of a cool fiber product is determined by the thermal conductivity of the fiber itself; while the dryness of a cool product generally refers to the moisture wicking and moisture absorbing properties of the fabric. The coolness and dryness of the cool fiber products are mainly reflected in two aspects: (1) good thermal conductivity, which is characterized by the cold contact feeling of the fabric, which makes the wearer feel the cool feeling. (2) Through various processing techniques, the cool fiber product changes the original fabric structure, enables the sweat secreted by the body surface to be quickly dissipated, and maintains the dry comfort when the body surface is in contact with the fabric. The existing processing methods for cool fibers on the market include: (1) Modifying the fiber or structurally designing the fabric, such as modifying the fiber to have a microporous structure or causing a large number of fine grooves on the surface to accelerate the transfer of moisture. (2) Adding ore particles during the melt spinning process, the composite ore powder can reduce the heat absorption rate of the fiber and accelerate the heat dissipation rate, and the fiber can produce a temperature difference of 1 to 2 ° C when it comes into contact with the skin of the body surface. Cool feeling. (3) Hydrophilic treatment of the surface of the fiber or fabric using a hydrophilic finishing agent to give the product a "cool" feel. At present, the coolness test, we can first refer to the "Furniture of Cooling Sense of Fabrics" (FTTS-FA-019) industry standard formulated by the Taiwan Textile Industry Research Institute. The principle is mainly to place the fabric on the cold plate of the instrument. When the temperature of the fabric is the same as that of the cold plate, the hot plate is quickly placed on the sample, and the heat of the hot plate is transmitted to the cold plate through the fabric, which can be instantaneously contacted. The maximum heat loss of the fabric is measured. This value is the Q-max value, and the unit is expressed by the instantaneous thermal flow rate (W/cm2) of the fabric. The Q-max value is the maximum value of the instantaneous heat loss of the skin when the human body touches the fabric. It is also the maximum heat flow that can be taken away by the unit area of ​​the fabric. This value is the index of the instantaneous cooling performance of the fabric. The unit is expressed in W/cm2. The larger the Q-max value, the more heat that can be taken away. This specification evaluates the eligibility criteria: the instantaneous thermal flow rate (W/cm2) of the fabric is ≧0.140. Of course, the new national standard GB/T 35263-2017 "Detection and evaluation of the thermal touch performance of textile contact" will be implemented on July 1, 2018. This standard specifies the detection and evaluation of the cool performance of textiles and skin. The method is applicable to all kinds of fabrics and their products. The test principle is to contact the thermal detection plate with the temperature higher than the sample under the specified test environment conditions, measure the temperature change of the thermal detection plate with time, and calculate the contact cooling coefficient (qmax), thereby Characterizes the instant cooling performance of the sample. The contact cooling coefficient qmax refers to the thermal detection plate whose temperature is higher than the specified temperature difference of the sample is in contact with the sample under a certain pressure, and the maximum value of the heat flux during heat transfer between the thermal detection plate and the sample, the greater the qmax value It means that the skin feels more cool, and the smaller the value, the weaker the skin feels cool. The schematic diagram of the test instrument is shown in the figure below. The above is a small knowledge related to cool fabrics compiled by Xiaobian for everyone, I hope to help everyone! 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