Can this make things cleaner?

Netizen "Curious SpongeBob" asked

A friend told me that down jackets should not be washed frequently, otherwise they will become less and less warm. Is this true? What is the principle of down jackets keeping warm?

Down jackets have excellent thermal insulation properties, which is determined by their structure: the down clusters have a cluster-like structure, consisting of a down core and many down fibers radiating from it. The velvet fibers are composed of many tiny hollow scales, which contain a large amount of still air. Because the thermal conductivity of air is very low, it forms a natural barrier that hinders the flow of hot and cold air. Coupled with the unique three-dimensional branch structure of down, down is fluffier and warmer than other insulation materials of the same weight (such as camel hair, cashmere, silk, cotton, chemical fiber, etc.).

The warmth retention performance of a down jacket mainly depends on its thickness. The thickness of a down jacket is directly related to the fluffiness of the down. The better the fluffiness of down per unit mass, the thicker it is.

The fluffy performance is mainly determined by the ratio of down to feathers in the down jacket. Theoretically, the higher the down content of a down jacket, the better its fluffiness and warmth retention properties. Of course, the above must be based on a certain amount of filling.

But in reality, we will find that there are not many down products with a down content of more than 90%, which makes sense. Down jackets with a down content between 75% and 85% generally have the best value for money. For ordinary consumers who do not live in extremely cold areas, this warmth retention performance is sufficient. Currently, the down content of down products on the European and American markets is generally within this range.

During the washing process of down jackets, some of the down fibers will fall off, and the fluffiness of the down jacket will be affected to a certain extent, but the impact is not great.

For a good quality down jacket, we recommend that you should not wash it too many times without affecting its cleanness when wearing it. At the same time, try to pat the clothes as gently as possible after washing to reduce damage to the down.