When purchasing a thermos, whether the liner is kept warm is a very important technical indicator.
Choose big brands if you can afford them. Expensive thermos bottles are naturally reliable. If you want to choose a cost-effective water bottle, you must consider many aspects, such as the material safety of the thermos, the thermal insulation effect, the glass insulation liner, and the stainless steel thermos. 304 stainless steel, etc.
When purchasing, you can fill the thermos with boiling water, tighten the stopper or thermos cap clockwise, wait for 2 minutes, and touch the outer and lower parts of the bottle with your hands. Insulation performance is not good enough.
The presence of peculiar smell in the thermos does not mean that the material of the thermos is unsafe. Most of the odors are not caused by the material of the thermos. It is very likely that odors may occur in the process of processing, packaging materials, and transportation and storage. If the thermos After using it for a period of time, there is still a peculiar smell. The source of the peculiar smell is not caused by the uncleaned beverage, so you should pay special attention. There may be a problem with the material of the thermos! There are two types of stainless steel thermos on the market, one is made of high manganese steel and the other is made of 304 stainless steel, so when we buy these two, we must check that it is made of high manganese steel It is made of 304 stainless steel.
In addition to the inner liner, excellent sealing also determines the thermal insulation performance of the thermos. For example, some thermos will be equipped with a leak-proof rubber ring on the inside of the cover, which can reduce the displacement of the thermos cap, and the thermal insulation will be more ideal. The disadvantage is that it needs to be cleaned frequently . The material of the rubber ring is preferably silicone, because it can withstand high temperatures of up to 220 ° C, and compared with rubber materials, it is less prone to deformation. When testing, you can fill a bottle of water, tighten the thermos cap, turn it upside down for a few minutes, and shake it a few times. If there is no leakage, it proves that its sealing performance is good.
The key to choosing a thermos bottle is to look at the glass insulation liner, whether the surface of the liner is bruised, whether the polishing is uniform, and whether the edge of the bottle mouth is smooth and flat. The place where the thermal insulation and cold insulation functions of the thermos bottle are poor is around the neck of the bottle, where the heat is mostly circulated by conduction. Therefore, the bottle neck is always shortened as much as possible when manufacturing. The larger the capacity and the smaller the bottle mouth, the better the thermal insulation effect. Under normal circumstances, the cold drink in the bottle can be kept at about 4 ℃ within 12 hours, and the boiling water is around 60°C.
Identify from the appearance of the vacuum flask. Check whether the surface of the inner tank and the outer tank of the thermos is uniform and consistent, and whether there are bumps, scratches or burrs; second, whether the welding of the mouth is smooth and consistent, which is related to whether the feeling of drinking water is comfortable; third, whether the inner seal is not Tightness, whether the screw plug and the bottle body match; four look at the bottle mouth, the more round the better, the immature process will be out of round.
Everyone knows that thermos bottles are fragile items, so the quality of the outer layer to protect the inner liner of the small-caliber thermos must be very good. It is now generally made of plastic, or the appearance of iron. When you choose a thermos, you should carefully observe whether the outer frame is complete and whether there are any flaws. Is the quality of the thermos bottle high-quality, and is there any thin place in the plastic case?