A sleeping bag is a bag for sleeping. Most of the sleeping bags on the market now have a comfort and limit temperature label. Comfort temperature is a series of temperatures that the user sleeps through the night, with a maximum and a minimum. The maximum comfortable temperature is the heat that is felt in the sleeping bag but not the heat that produces a lot of sweat. It is generally defined as unzipped sleeping bag, arms on the outside, head not tightened, etc.
The purpose of a sleeping bag is to keep as little heat as possible from being lost. The body inside the bag generates heat to keep it warm
There are two main types of fillers, down and synthetic cotton, as well as a single layer grab bag.
also divided into duck down and goose down, goose down under the same conditions of warmth slightly higher than the duck down. Down has three main performance indicators: the first index is the filling weight, such as 400 grams of goose down sleeping bag, 1100 grams of duck down sleeping bag, this weight does not mean the weight of the sleeping bag, but refers to the net weight of the filling down; The second index is the content of feather. Feather is composed of feather and feather. Feather has supporting function, and warmth mainly comes from fine feather. The content of wool is expressed as a percentage. For example, 80 wool means that the content of wool in 100 weight units is 80. Duck down usually has a high content of 85 to 90, while goose down can have 90 to 95. The third index is the expansion degree of down. Fill power refers to the number of cubic inches per ounce of down under the pressure of 68.4 grams. The higher the expansion degree of down, the better the warmth performance of down. The expansion degree of domestic duck down is around 450, and that of domestic goose down is from 450 to 600. The Andean goose-down imported from the United States has a content of about 95 and a swelling degree of 700 to 800.
Chemical fiber cotton:
a lot of kinds, poor quality. Ordinary spraying collodion, seven to four holes cotton, cotton (porous cotton market seven holes nine holes cotton concept: country there is no standard about the long-short pillow, is no specific requirements on porous fiber content, the so-called "hole" the number, but no, the pillow "quoted China authority yizheng chemical fiber industry, advanced technology of yizheng chemical factory production just a hole of the hollow fiber, there is no bore seven or nine fiber, the market most of the above seven or nine holes are hollow cotton fiber.) , 3M Thinsulate cotton, POLARGUARD 3D/HV cotton, etc. The difference between polarguard 3d and polarguard HV is that the former is more compressible, while the latter is more warm. The 3d is usually -5~-15℃, while the HV is -15~-25℃.
All kinds of chemical fiber filler sleeping bags, as the use of time to increase the thermal performance will be slowly reduced until unable to make, but they have a feather sleeping bag does not have an advantage, is wet can remain part of the thermal performance, unlike the down once the wet is not warm and even negative effect. The filling density is expressed in terms of weight per meter squared, e.g. 260 g/m squared, 320 g/m squared. Compared with the two fillers of down and chemical fiber cotton, the down has a higher degree of warmth preservation, and the weight can be light at the same level of warmth preservation. The thermal insulation degree of chemical fiber cotton is relatively low, the packaging volume is large, and the compressibility is poor; Down expensive, chemical fiber cotton cheap; Down moisture will lose almost all the ability to keep warm, and not easy to dry, so harsh mountaineering environment often use waterproof and breathable material to make the outer material of down sleeping bag, chemical fiber cotton has a certain waterproof performance, wet to maintain a certain thermal performance, and drying speed; The service life of down product is very long, good maintenance can use more than 10 years, and the life of chemical fiber cotton sleeping bag is not 3, 4 years.
bags are sewn with fleece and can be used as summer or sanitary sleeping bags. It can also be used with other sleeping bags in winter to enhance warmth. According to the experience of time, a 3 - degree sleeping bag, with fleece sleeping bag after the warm effect up to about 10℃.