The insulation of the sleeping bag.
The thermal insulation is largely dependent on the filling in the sleeping bag, which can be divided into artificial cotton (including general acrylic cotton, dupont 7 hole cotton and space cotton, etc.) and down. In man-made materials to replace natural material trend today, feather is also referred to as the main sleeping bag filling material, even under extreme environment using the basic are down sleeping bag, this is determined by the feather their own characteristics. Eiderdown is a soft layer of soft velvet that is used by birds to keep themselves warm. This kind of fleece has a nice fluffy shape and is a tiny hollow tube.
As everybody knows, the principle of heat preservation is the use of air is a poor conductor of heat characteristic, using a variety of materials to form a thick enough air wall in order to realize the insulation. Down this characteristic, also decided to, its heat preservation, far more than the average cotton or viscose class. So today we only talk about down sleeping bag.
It is the temperature scale that reflects the thermal insulation.
The general temperature scale consists of three data: the lowest temperature, the comfortable temperature, the highest temperature. Minimum temperature: refers to the maximum temperature used in the sleeping bag, indicating that you won't be frozen to death at such a low temperature. It's hard to say if you can sleep. Below this temperature is extremely dangerous for users.
Comfort temperature: the ideal temperature for the sleeping bag. At this temperature, people can fall asleep very comfortably, not because they are too cold to sleep.
Maximum temperature: refers to the upper limit of temperature range, which is higher than this temperature, and the user will be too hot to bear.
There are two ways to identify the comfort temperature in a sleeping bag.
One is to identify an absolute temperature, such as -40 degrees, indicating that the comfortable temperature of the sleeping bag is -40 degrees.
One is to indicate the temperature range, from red to green or blue, such as red from 14 degrees, to blue at 10 degrees, and dark blue at -3 degrees. The meaning of this temperature is: 14 degrees warm, 10 degrees is appropriate, -3 degrees is very cold, the comfortable temperature of this sleeping bag is 10 degrees.
To be comfortable temperature is just a relative concept, no sleeping bag products industry standards, domestic and abroad also have no, some of the big brands and research institutions according to lab experiment and field experience, comfortable temperature calibration of their products. This temperature is only for reference and varies from person to person, depending on the environment. In general in Europe and the brand of sleeping bags on the scale is not very suitable for Asian people, because the europeans in the cold resistant ability is far higher than asians, so we take special attention when the choice.
There are three main performance indicators.
The down sleeping bag is basically stuffed with duck down and goose down, which is much warmer than the duck down, and the goose down is much smaller than the duck down. So now the climbing down sleeping bag is almost always goose down. The first indicator is the puffiness of the feather, and Fill power is the volume of an ounce of down. The bigger the volume, the more air it holds and the warmer it is. In other words, the higher the feather, the more the down feather can lock more volume of air to heat and insulate. The bulk of domestic duck down is about 450, and the bulk of domestic goose down is from 450 to 600. The imported goose down is up to 700 to 800, the highest is above 900.
Volume is the most important indicators, feather products, not only determines the heat preservation, the compressibility is also a basic guarantee. Down sleeping bag is one of the advantages of good compressibility, 1000 g of down sleeping bags can reasonable compression to the size of a football, and once released after compression, still can quickly enter the fluffy state.
The second indicator is the amount of suede, such as an 800-gram velvet sleeping bag, and 1, 100 grams of duck down sleeping bags. This weight is not the weight of the sleeping bag, but the net weight of the feather. As long as you know how much it is and how much weight you have, you can estimate the comfort of the sleeping bag: for example, if you fill a kilogram of goose down with an 800 kpty, then -20 degrees is pretty good. So, all the bags that are unmarked and not filled with weight are rogues.
The third index is the amount of cashmere, which is made up of peels and fleece, to keep warm. However, all of them are not supported by the stalks, and the down is not up. So the amount of suede directly affects the pentium of the down. The percentage of the suede is expressed as 80, indicating that the content of wool in 100 weight units is 80 units. Duck down with a maximum of 85 to 90, goose down can be up to 90 to 95.
Here's a look at some of the so-called cheap down sleeping bags. If you see a down sleeping bag that is clearly below the market price and claims to be 90% down, you can make sure that it is not down because it is not even expensive. So how do you achieve this incredible miracle? Before crushing rushes to pretend to be down, but the handle is too obvious, now manufacturers generally use is velvet silk blended into the right amount of hair, wool yarn is flying in feather processing residues, which are attached on the silk of a root, but out from the stem in the processing, the material itself to make a pillow or other low-end products. But after the filling into the sleeping bag, because no stem, the touch can feel HanRong is very high, and because of losing the support of stem, in the equal density is far higher than normal feather, so 1000 grams, smaller than the same amount of down a lot, on the surface, seem to have very good compressibility. But in fact this kind of thing insulation and feather difference is obvious. So this is by no means a cheap option.
Weight of sleeping bag
The weight of a down sleeping bag is the weight of a sleeping bag. It can be said that the weight of the sleeping bag can be reduced to a large extent only from the skin. Skin material: skin materials generally need to have a certain strength, in order to make sure to use a relatively long time, and for the requirement of field use, now most can prevent water processing, which is a little water on not penetrate quickly. The waterproof is not enough to fight against rain, if you need no camping tents, sleeping bags or other purchasing GTX materials is better, there is also a part of the brand, MHW, for example, use of waterproof breathable fabrics and seamless joint process can be totally waterproof, natural leverage price drops.
Lining material: usually requires more than 200T, because if the index of lining material is lower than 200T, individual hair sticks will be worn out, but thick fabrics will also be drilled in the seams. Now a lightweight bag that weighs about 400 grams, and the extreme can be 300 grams, which adds up to the full weight of the sleeping bag.
The size and shape of the sleeping bag.
Because the sleeping bag manufacturer in domestic are produced according to the size of the foreigner, so all is 2.2 m above the sleeping bag, the big and small and the girl with a rather warm, have improved over the years, pay attention to when choosing resolution.
Way of filling:
To prevent the down from running back and forth in the sleeping bag. As a result of the down hole and not keeping warm, the down sleeping bag usually stitches the outer fabric and inner fabric into a single lining. To ensure the feather positioning, and easy to restore its fluffy appearance.
In the position of chest and foot, in order to prevent the feather from sliding down to the sides, there is little down in the middle down, and there are a lot of vertical lining structures in the chest and foot.
Some alpine sleeping bags even add a layer of feathered insulation to their chest and feet.
Zip:
A good zipper should be used. Now many high-grade sleeping bags have been treated with nylon straps at the zipper closure to prevent the zipper from being caught in the use of the zipper.
Appearance:
The mummy style is best insulated in the same weight of a sleeping bag. Today's down sleeping bag also takes into account the warmth of the neck, which is added with a windproof chest collar to reduce heat from the neck.
The sleeping bag is usually waterproof, it is better to have some compression function, so it is easy to compress the volume and carry easily.
Precautions for sleeping bags.
1. Use the sleeping bag to keep it dry, because the insulation of the sleeping bag will be greatly reduced, especially the down sleeping bag, which will not keep you warm. So in rainy days, protect your backpack from the water, or seal your sleeping bag in a waterproof bag in advance. The sleeping bag should be dried or dried in time after damp. The wet down sleeping bag can not be kept for a long time, otherwise it will become moldy and even decayed. 2. When using a sleeping bag, there are several ways to improve warmth: 1 is equipped with a good moisture-proof mat, as the saying goes, it is better to have a thicker pad than a thick one. If you have a condition, drink a hot beverage before going to bed. 3. It is very effective to wear a long warm underwear and dry socks. 4 is to squeeze more people into a tent;
3. In addition whether down sleeping bag or chemical fiber cotton, in the case of long time not to use, as far as possible in a liberal state of preservation, to keep the feather fluffy, prolong service life, especially down sleeping bags, as far as possible to save on dedicated down sleeping bags storage bags (breathable loose cotton bag).
4. Washing method of down sleeping bag: according to the advice of feather experts, the down sleeping bag should be cleaned once in 4 years. The service life is about 10 to 12 years, and can be cleaned 3 times. If it is not too dirty, it is easy to clean, such as using a towel to clean the surface material. In addition, down sleeping bag can only use special detergent hand washing, remember cannot machine wash!