What factors determine the length of insulation time for a thermos cup

What factors determine the length of insulation time for a thermos cup? In fact, the length of insulation time for vacuum insulated cups depends on the structure of the cup body and the thickness of the cup material.
Generally speaking, the thinner the cup material, the longer the insulation time. But the cup body is prone to damage and deformation, which affects its service life; The outer layer of the vacuum cup liner is wrapped with metal film and copper plating, which can also increase the degree of insulation; Vacuum cups with large capacity and small diameter have a longer insulation time, while those with small capacity and large diameter have a shorter insulation time; The service life of a vacuum cup also depends on the cleaning of the inner layers of the cup and the time of vacuuming, and most importantly, the structure of the vacuum furnace.
The vacuum equipment used in the market for vacuum insulated cups includes vacuum exhaust stations and vacuum brazing furnaces, with approximately two types and four types. One type is the tail vacuum exhaust table; Another type of brazing furnace. The brazing furnace types are divided into single chamber, multi chamber, and multi chamber with increased pumping speed.
Single furnace integral vacuum brazing furnace. The vacuuming cycle time of this furnace is long. If the manufacturer wants to improve production efficiency and shorten the vacuuming time, it will affect the service life of the cup. The lifespan of the cup is only about 8 years. There is a tail vacuum cup exhaust station and its advantages: The vacuum cup produced by the tail exhaust station has a heating temperature of about 500 ℃ during vacuum pumping. The outer shell of the vacuum cup is not easily deformed, but the copper tube welding area is prone to leakage and needs special protection during semi-finished product processing.
Another major category is the vacuum brazing furnace type, which can be roughly divided into three types. I didn't expect that although the vacuum insulated cups we usually use may not look much different from ordinary insulated cups in appearance, the production process of vacuum insulated cups is much more complex and technically difficult compared to ordinary insulated cups. So, vacuum insulated cups are at least twice as expensive as regular insulated cups.