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The Principle Behind The Thermos Cup
As we all know, the real purpose of buying a thermos cup is to ensure that the liquid in the cup continues to maintain a high temperature so that people can drink hot water at any time. To achieve this, the thermos cup must reduce the heat transfer movement between the inside and the outside. There are three basic factors that affect the movement of heat transfer, namely convection, conduction and radiation. The reason why the thermos cup can keep warm is that the inner liner basically prevents these three ways of heat transfer in terms of structure. In addition to some thermal knowledge, the thermos cup will also be exposed to some principles of acoustics when used.
Table of Contents
So how do thermos cups work?
一. The thermos cup has a small mouth and a leak-proof ring to prevent heat convection
Because the convection of heat is related to the surface area of the liquid, the larger the surface area, the faster the heat convection, the more heat is lost, and the faster the temperature of the hot water drops. Therefore, the mouth of the thermos bottle is made quite small, which can greatly reduce the convection of heat. Adding a cork to the mouth of the bottle can reduce the flow of gas on the surface of the hot water, cut off the convection channel of heat, and prevent the convection of air inside and outside the bottle. Second, it can make the high-calorie molecules escaping from the hot water collide with the cork and then return to the original hot water, which can slow down the loss of hot water heat energy.
二. The inner liner is a double-layer vacuum structure to prevent heat conduction
Vacuum can hardly transfer heat. In order to reduce heat dissipation, vacuum is used to block heat transfer. The inner liner is made of double-layer stainless steel, with a distance of only a few millimeters in the middle, and the air in the interlayer is extracted to create a relative vacuum. This is done to prevent heat conduction.
三. The inner liner is silver-plated to prevent heat radiation.
A layer of silver film is coated on the double-layer surface of the inner liner to improve the surface finish and smoothness. Because the surface of the inner liner is smooth, the heat radiated from the inside and outside to the surface of the inner liner can be reflected back. And the smoother the surface of the inner liner, the stronger the ability to reflect heat. Therefore, it is difficult for the heat in the hot water to radiate through the smooth surface of the inner liner, that is, to prevent heat radiation.
When filling the thermos cup with water, the sound in the inner liner can be used to determine whether the thermos is intact. This can be well explained from the principle of acoustics.
When choosing a thermos cup, people try to put their ears to the mouth of the bottle and listen to the sound inside the bottle. The louder the sound, the better the quality of the bottle and the better the insulation effect. From the knowledge of acoustics, we know that the transmission of sound waves depends on the cutoff in the middle, that is, vacuum cannot transmit sound. In addition, if sound waves encounter obstacles during the propagation process, they will reflect. There are sounds of various frequencies around us at all times, and some of these sounds will always enter the inner liner. When these sounds hit the smooth silver-plated surface in the inner liner, they will be reflected in the bottle liner, and cannot pass through the high vacuum interlayer, so a relatively strong echo is formed inside. This is why people can hear sounds in thermos cups. The higher the brightness of the silver-plated surface, the higher the vacuum in the interlayer, the louder the sound heard, and the better the insulation effect. On the contrary, the insulation effect is worse.
By the way, Doyoung has decades of experience running its own water bottle manufacturing plant in China equipped with a comprehensive production line. We have a lot of experience in producing stainless steel thermos cups, customizing them, and opening molds. No matter what the customer’s needs are, we can meet them. Over the years, we have worked with various well-known brands and won wide acclaim and customer trust. We offer flexible MOQ options and have a dedicated team to handle small orders and provide samples when needed. Choosing Doyoung as your blank bottle and tumbler supplier is a wise decision to improve the quality of your customization services and increase profitability.
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