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A vacuum cup is generally a water container made of ceramic or stainless steel and a vacuum layer. It has a cover on the top and is tightly sealed. The vacuum insulation layer can delay the heat dissipation of water and other liquids inside to achieve the purpose of heat preservation.
The thermos cup is developed from the thermos bottle. The principle of heat preservation is the same as the thermos bottle, but people make the bottle into a cup for convenience.
There are three ways of heat transmission: radiation, convection and conduction. The silver liner in the insulation cup can reflect the radiation of hot water, the vacuum of the liner and the cup body can block the heat transfer, and the bottle that is not easy to transfer heat can prevent heat convection. vacuum flask.
Functional
The appearance is smooth and clean without peculiar smell. After the boiling water is injected, the holding of a thermos cup without heat sensation can be called a good cup.
The interior and exterior are made of stainless steel, refined by advanced vacuum technology, elegant in shape, seamless in liner, good in sealing performance, and good in heat preservation. You can put ice cubes or hot drinks. At the same time, functional innovation and detailed design also make the new insulation cup more meaningful and practical.
With multiple functions, "one cup for multiple purposes" has become a popular practice for new type of insulated cups. Almost every heat preservation cup has its own unique characteristics. Some of them are designed with double covers. When driving, just press the small red key in the middle, water will flow out automatically without splashing on the car; Some of them have a tea partition design in the middle of the insulation cup, which can filter tea and tea quickly, and is very suitable for small white collars in the office; There is also a double cup design. The bottom box cover also has a dark box for tea, sugar, coffee, etc., while the vacuum tank made of stainless steel double layers can hold not only boiled water, but also ice water, etc. Some cups also have a braising function. The insulation cup with the least functions also has at least two functions, while the insulation cup with the most functions has 4-5 functions, which are very convenient for both traveling and home use.
Production process
There are many layers in the insulation cup, and its interlayer is generally vacuum to prevent heat conduction! It is then plated with silver, which prevents thermal radiation. Some cup lids have corks on them to prevent heat conduction.
Shopping Skills
There are many kinds of stainless steel insulation cups sold on the market, and the price difference is also very large. For some consumers, they do not understand its principle, and often spend a lot of money to buy unsatisfactory products. How can I buy high-quality vacuum insulation cups?
First, look at the appearance of the cup. Check whether the surface polishing of the inner and outer bladder is uniform, and whether there are bruises and scratches;
Second, check whether the mouth welding is smooth and consistent, which is related to whether it is comfortable to drink together;
Third, the quality of plastic parts is poor. It will not only affect the service life, but also affect the sanitation of drinking water;
Fourth, check whether the internal seal is tight. Check whether the screw plug and cup body fit properly. Whether the screw in and screw out are free and whether there is water leakage. Fill a glass of water and invert it for four or five minutes or shake it vigorously to verify whether there is water leakage. Then look at the thermal insulation performance, which is the main technical index of the thermal insulation cup. It is impossible to check according to the standard when purchasing, but it can be checked by hand after being filled with hot water. The lower part of the cup will heat up after two minutes of hot water is filled in the cup without heat preservation, while the lower part of the cup with heat preservation is always cool.
There are several specific methods as follows:
1. Simple identification method for vacuum heat preservation performance: pour boiling water into the heat preservation cup and screw the bottle stopper or cup cap clockwise for 2-3 minutes, then touch the outer surface of the cup body with your hand. If the cup body is obviously warm, it indicates that the product has lost its vacuum degree and cannot achieve good heat preservation effect.
2. Identification method of sealing performance: after the cup is filled with water, screw the bottle stopper and cup cap clockwise, and place the cup flat on the table, without water leakage; The cup cover and cup mouth shall be rotated flexibly without clearance.
3. Identification method of plastic accessories: The new food grade plastics are characterized by small odor, bright surface, no burr, long service life and no aging. Common plastics or recycled plastics are characterized by strong smell, dark color, many burrs, and easy aging and fracture of plastics.
4. Simple capacity identification method: the depth of the liner is basically consistent with the height of the shell, and the capacity is consistent with the nominal value (the difference is 16-18MM). Some insulation cups with poor quality add sand and cement blocks to make up for the missing weight. Mistake: Heavy cups (pots) are not necessarily good.
5. Simple identification method for stainless steel materials: there are many specifications for stainless steel materials, among which 18/8 means that the stainless steel material contains 18% chromium and 8% nickel. Materials meeting this standard are green environmental protection products that meet the national food level standards, and the products are rust proof and corrosion resistant. The color of ordinary stainless steel cup is white and dark. If it is immersed in 1% salt water for 24 hours, rust spots will appear, and some elements contained in it exceed the standard, directly endangering human health.