The temperature inside the clothes is managed by controlling the three factors of heat convection, conduction, and radiation. To keep warm, clothes with a layer of immovable air are the most popular in order to prevent the heat emitted from the human body from being discharged to the outside.
However, in recent years, in addition to the low heat conduction mentioned above, technologies that actively store or generate heat have also been developed.
Low thermal conductivity materials:
Methods of creating voids include
(1) Hollow wire:
Methods such as direct spinning with a hollow nozzle or core-sheath composite fiber with a core of soluble polymer, which is dissolved and hollowed out during the finishing process;
(2) Porous wire:
A method of adding soluble compounds, dissolving and forming pores in the post-process after melt spinning;
(3) Mixed fiber and composite processing:
Use mixed fibers with fibers with poor shrinkage or composite spinning to weave woven fabrics with more gaps. Ceramic heat storage material: a raw fiber modification method that adds ceramics (such as zirconium carbide, etc.) that have the function of absorbing sunlight and converting it into heat or ceramics with high far-infrared reflection and radiation efficiency into the interior, but it is processed later The same effect can also be obtained by applying the ceramic sol obtained by the sol-gel processing method to the woven fabric. Moisture-absorbing and heat-generating materials: Acrylic fibers that generate heat when absorbing moisture above wool are well-known (such as “Yixi” Toyobo).
Phase Change Material (PCM):
When a substance dissolves and solidifies repeatedly under certain temperature conditions, heat is absorbed and released. This kind of PCM changes from solid to liquid as the temperature rises, exerting the cold storage effect caused by the endothermic phenomenon. As the temperature decreases, it changes from liquid to solid, exerting the heat storage effect caused by the heat generating phenomenon. The above techniques are employed individually or in combination.
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