What are some raised black spots on the bottom of the stainless steel water cup?

Recently, the editor saw a message from a reader, and the message said, "When cleaning the water bottle, I accidentally cleaned the gasket at the bottom of the water bottle and found a slightly raised black spot inside the water bottle. What is it for? Is this kind of water bottle a bad water bottle?"

When you buy a water cup, you will find that most of the bottom of the water cup has a foot pad made of silica gel, and there are also gaskets made of other materials, so you can't see what the bottom of the water cup looks like?The foot pad made of silicone has several functions. One is to play a non-slip and stable role, so that the water cup will not fall when it is placed on a smooth or slightly inclined table;

The second is to play the role of mute. Some water cups have no foot pads at the bottom. When using them, you will find that the sound will be relatively loud whether it is rubbed or placed;The third is the role of aesthetic occlusion. The foot pad can cover the bottom of the water cup, so that some parts that cannot be completely beautiful during reprocessing are not directly displayed, and improve the overall aesthetics of the water cup.

Back to the reader's question just now, what is the raised black spot at the bottom? Speaking of this, the editor would like to talk about the production process of the stainless steel thermos cup.

The stainless steel thermos cup is made of double-layer stainless steel. The air between the two layers is drawn out through the vacuum process to form a vacuum state, so that the vacuum plays the role of isolating the temperature. The vacuum is heated at a high temperature of 600°C for 4 hours, so that the air between the two layers is continuously expanded, and after expansion, the double-layer sandwich wall will be squeezed out. Of course, there will still be some remaining between the walls, and these remaining air will be absorbed by the getter between the walls of the water cup. Then some friends will definitely ask, how can the air between the interlayers be squeezed out?Is there a vent? Yes, the bottom does have vents.

Since there is a vent hole that is not blocked after exhausting, will the air continue to fill up?This makes it impossible to form a vacuum state. If you think of this, it means that you like to think, and you are on the point. This has to say the slightly raised black dot at the bottom of the water bottle. In order to block this vent hole, it is also necessary to consider that it will not fall off easily when it is blocked and then used later, so a special glass product is used.

This glass bead needs to go through a long time of high temperature to melt. After melting, not only can the vent hole be closed, but also because the texture is hard and firm.The water cup will not fall off easily after long-term use. So this small black raised dot is very important. The water cup with small black dots is not only not a bad water cup, but also shows that this water cup is a thermos cup that has undergone a vacuum process.

Dongguan Zhanyi Commodity Technology Co., Ltd. specializes in the production of metal cups, plastic cups, coffee cups, suction mug, lunch boxes, food jar, travel mugs, portable water bottles, sports bottles, home life desktop trash cans, thermos bottles, etc.These products are all our annual exports, and are recognized and loved by the US, Europe, Australia, Japan, South Korea, Taiwan, Hong Kong and other consumers. Support for small quantity order, fast customization.