Functional evaluation and standards of far-infrared textiles
What are “far-infrared textiles”
Far-infrared textiles can absorb electromagnetic waves emitted by the environment or the human body in a wide range of wavelengths, and radiate far-infrared waves in the wavelength range of 2.5 to 30 μm. infrared. This is because the additive with far-infrared radiation function added to the textile absorbs the electromagnetic radiation energy from the outside, and the energy state of its molecules transitions from a low energy level to a high energy level, and then returns to the unstable high energy level to a lower level. The steady-state energy level radiates far-infrared rays.
Because among the electromagnetic waves radiated by far-infrared textiles, the far-infrared rays in the wavelength range of 4 μm to 14 μm have the same vibration frequency as water molecules in human cells. When the human body surface is radiated, it will cause molecular resonance in the cells. , produces a thermal effect, activates human surface cells, promotes microcirculation of blood in human subcutaneous tissue, and achieves the effects of keeping warm, maintaining health, promoting metabolism, and improving human immunity.
Additives used in the preparation of far-infrared textiles are generally ceramic powders with far-infrared radiation function at room temperature, and the particle size is usually below 0.5 μm. This type of ceramic powder is generally metal oxide or metal carbide, such as alumina, zirconia, magnesium oxide, titanium dioxide, etc.
Function of far-infrared textiles
The warmth-keeping function of far-infrared textiles comes from its ability to emit far-infrared rays after absorbing the energy of external electromagnetic radiation and reflect the human body Emit far infrared rays. Therefore, clothing made of far-infrared textiles can prevent human body heat from dissipating to the outside and play an efficient thermal insulation role.
The role of far-infrared fibers in promoting microcirculation is based on the fact that after absorbing external electromagnetic radiation, mainly visible light, the far-infrared rays emitted and the far-infrared rays reflected by the human body act on the surface cells of the human body. Due to the vibration frequency In the same way, it enhances the thermal movement of molecules and promotes microcirculation and metabolism of subcutaneous tissue. Obviously, to achieve these goals, there are two necessary conditions, one is to absorb external energy, and the other is to be in direct contact with the skin. Due to the limited ability of far-infrared rays to penetrate ordinary textiles, only when applied to underwear can it promote microcirculation. However, in this way, its way of absorbing external energy is limited, and more of it reflects the energy emitted by the human body itself. Far infrared rays have very limited energy.
Existing evaluation methods
There are two ideas for evaluating the far-infrared radiation function of far-infrared textiles: one is the direct method, that is, measuring the amount of energy the sample receives from the outside. The ability to emit far-infrared light; the second is the indirect method, that is, measuring the temperature rise of an object after being radiated by the sample, provided that energy conversion must be possible between the sample and the radiated object.
The current internationally accepted method is to measure the normal emissivity of far-infrared light emitted by a sample when it receives external energy.
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