A vacuum cup is generally a container made of ceramic or stainless steel with a vacuum layer to hold water. It has a lid on the top and is tightly sealed. The vacuum insulation layer can delay the heat dissipation of liquids such as water inside, achieving the purpose of insulation.
Vacuum cups have evolved from thermos bottles, and the insulation principle is the same as thermos bottles, except that people make bottles into cups for convenience.
Source of development
There are three ways for heat to propagate: radiation, convection, and conduction. The silver cup liner inside the insulated cup can reflect the radiation of hot water, the vacuum in the liner and body can block the transfer of heat, while the bottle that is not easy to transfer heat can prevent heat convection.
Functional
The appearance is smooth and odorless. After injecting boiling water, holding a insulated cup with no heat sensation can be considered a good cup. Both the inside and outside are made of stainless steel, refined with advanced vacuum technology. The design is elegant, the inner liner is seamless, and the sealing performance is good, with good insulation performance. It can be served with ice cubes or hot drinks. At the same time, functional innovation and detailed design also make the new insulation cup more meaningful and practical.
‘One cup for multiple purposes’ has become a popular practice for new insulated cups. Almost every insulated cup has its own unique characteristics, some with a double lid design. When driving, just press the red button in the middle, water will automatically flow out without splashing on the car; Some have a tea infuser design in the middle of the insulated cup, which can quickly filter tea leaves and water, making it very suitable for people in the office to use; There is also a double cup design, with a hidden compartment for tea, sugar, and coffee on the bottom box cover. The vacuum container made of stainless steel double layers can not only hold boiling water but also ice water. Some cups also have a braising function, and the least functional insulation cup has at least two or more functions. The most functional insulation cup has 4-5 functions, making it very convenient for travel or home use.
Production process
There are many layers inside the insulation cup, and its interlayer is usually vacuum to prevent heat transfer! Then silver is plated to prevent thermal radiation. Some cup lids have corks on them to prevent heat transfer.
Selection Techniques
There are many types of stainless steel insulated cups available on the market, with significant price differences. For some consumers, they do not understand their principles and often spend a lot of money to buy satisfactory products. How can I buy high-quality vacuum insulated cups?
The first thing to look at is the appearance of the cup. Check whether the surface polishing of the inner and outer tanks is uniform and consistent, and whether there are any bumps or scratches;
Secondly, check whether the welding at the mouth is smooth and consistent, which is related to whether the feeling when drinking water is comfortable;
Thirdly, the quality of plastic components is poor. Not only will it affect the service life, but it will also affect the hygiene of drinking water;
Fourth, check if the internal seal is tight. Check if the screw plug and cup body fit properly. Check for ease of rotation in and out, and check for water leakage. Fill a glass of water and invert it for four to five minutes or vigorously shake it a few times to verify if there is any water leakage. Looking at insulation performance, this is the main technical indicator of insulation cups. It is generally not possible to check according to the standard when purchasing, but it can be checked by feeling when filled with hot water. The lower part of the uninsulated cup will become hot after two minutes of hot water, while the lower part of the insulated cup is always cool.
There are several specific methods:
1. Simple identification method for vacuum insulation performance: Pour boiling water into the insulation cup and tighten the bottle stopper or lid clockwise for 2-3 minutes. Touch the outer surface of the cup body with your hand. If there is obvious warming phenomenon on the cup body, it indicates that the product has lost its vacuum degree and cannot achieve good insulation effect.
2. Sealing performance identification method: After adding water to the cup, tighten the bottle stopper and lid in a clockwise direction, and place the cup flat on the table, ensuring there is no water leakage; The rotation of the cup cover and cup mouth should be flexible and without gaps.
3. Plastic parts identification method: The characteristics of food grade new plastics are small odor, bright surface, no burrs, long service life, and not easy to age. The characteristics of ordinary plastic or recycled plastic are strong odor, dark color, multiple burrs, and easy aging and fracture of plastic.
4. Simple capacity identification method: The depth of the inner liner is basically consistent with the height of the outer shell, and the capacity is consistent with the nominal value (with a difference of 16-18MM). Some poor quality insulation cups add sand and cement blocks to the cup to make up for the missing weight. Myth: A heavier cup (kettle) may not necessarily be good.
5. Simple identification method for stainless steel materials: There are many specifications for stainless steel materials, with 18/8 indicating that the stainless steel material contains 18% chromium and 8% nickel. Materials that meet this standard are green and environmentally friendly products that meet national food grade standards, and are rust proof and corrosion-resistant. The color of the ordinary stainless steel cup body appears white and dark. If it is soaked in 1% saline solution for 24 hours, rust spots will appear, and some of the elements contained in it exceed the standard, directly endangering human health.
