feather down

Feather down

Feather has the performance of keeping warm, to start from the way heat transfer.
Generally speaking, heat is transmitted mainly through conduction, convection and radiation. In the cold season, the heat of the human body is also sent out to the cooler space around through these three ways. But in the case of wearing clothes or under the quilt, the heat is mainly by conduction. This requires the thermal conductivity of the insulation material to be low. And feather has the characteristics of low thermal conductivity.

High quality down has a high degree of fluidity, which is any other E – protection materials can not be compared. The more fluffy a thermal material is, the larger the gaps between the fibers of the material and the more stagnant air it can hold. And air is a poor conductor of heat, can play a role in preventing heat conduction to the surrounding. Therefore, the higher the fluidity, the better the thermal performance. If you don’t take into account the difference in thermal conductivity between fabric fibers (which is very small), then down products are 20-50% less conductive than ordinary fabrics of the same thickness, i.e. 1-4 times better at keeping warm. The higher the density of the product filler, the greater the heat conductivity, the more heat is lost. The down feather of high velvet child content, have higher fleeciness, make its products below same thickness density is smaller thereby, because this keeps warm sex higher. Accordingly, use down feather with higher content of velvet, can reduce the weight of filling material appropriately, can get same warm sex already, can reduce the weight of products again. This is why down products are light, soft and warm.

The higher the velvet content of down, the higher its fleeciness generally, the better the relative protection, the more comfortable t. There is no 100% feather content, unless it is manually selected to achieve, machine I seed content can be

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