The difference between "feather" and "fluff"

　　Feathers can be slightly divided into "feather" and "velvet".

　　"Feather" in the feather, there is a central axis, called "feather axis", and on both sides of the "feather axis" there are two rows of hard "branches" called feathers. The main function of the "feather" is to stir up the air during the flight of birds, to help flight and to hold the bird's body high in the air.

　　The "feather" is a feather that does not have a "shaft", but is composed of many slender and soft filaments irregularly gathered in a central point and connected to the bird's body. When the fibers of each central point spread in the air, it looks like a flower, so it is called "velvet flower", "velvet" the main function is to maintain the bird's body temperature.

　　Birds and poultry all have feathers, but only waterfowl and some birds that spend part of their lives in water have feathers, such as ducks and geese. "Velvet" mostly grows in the chest, abdomen, neck and armpit parts of waterfowl. The main thing is to keep the body temperature of the waterfowl swimming.

　　"Velvet" is the only natural good and light insulation material. "Velvet" itself can not produce heat energy, its insulation function is mainly because each velvet has a lot of soft velvet, when the velvet is diffused to form a three-dimensional pompom, the best temperature insulator air, wrapped in this pompom; Thus it becomes a super warm bag, in addition to preventing the leakage of body temperature, it can also resist the invasion of cold air outside.

　　Birds have long known how to use "feather" and "velvet" mixed together to build a nest, and when the human cheek stole bird eggs, it accidentally found that the mixture of "feather" and "velvet" is very soft and comfortable and warm, and began to collect "velvet" to be applied to warm clothing and bedding.

　　At present, most of the "velvet" explored by human beings are collected from aquatic poultry, such as ducks and geese. In terms of volume, goose down "velvet" is larger, and the price is higher. The main reason is that the cost of raising geese is more expensive.

　　In terms of warmth, there is basically no difference between duck down and goose down. Because "velvet" itself can not produce heat. The degree of warmth of clothing mainly depends on the following factors:

　　1, the "velvet" itself is fluffy, which directly affects the amount of static air that can be wrapped in a good insulation object.

　　2, the amount of "velvet" contained in the finished product.

　　3, the design of clothing, including the fabric used, style and structure of clothing.

　　To protect the interests of consumers and determine the degree of warmth of the finished product; Different regions and countries have different specifications. And requires each finished product to clearly list the content of the finished product and the composition of the velvet on the label.

　　In general, the generally accepted commercial specifications for each anthems 80/20 goose down should occupy 500 cubic inches of space in the case of fluffy, the higher the degree of fluffy represents the better the degree of warmth, these high-quality products are embroidered with 600 or 700 words respectively.