Why should vacuum test be performed repeatedly for insulation cup? (two)

After vacuum pumping, a vacuum test will be carried out before the spraying process. The purpose is to screen out the non vacuum cup body to avoid the increase of spraying cost. If the painted cup body needs to be warehoused because it is not assembled immediately, it needs to be vacuumized again after the next delivery. Since most of the water cup production is now in automatic or semi-automatic production, it is not ruled out that the welding of some water cups may lead to faulty welding. This phenomenon will result in no problem during the first vacuum test. After storage for several days, there will be vacuum breaking and air leakage caused by internal and external pressure at the position of faulty welding, so vacuum detection can be used to screen out such water cups after storage.

At the same time, the vibration during warehousing or handling will cause the getter of a few water cups to fall off. Although many cups of getter fall off and will not affect the thermal insulation performance of the cup. However, some air leakage and vacuum breaking may occur due to the falling off of getter. Most of these problems can be selected through this test.

If the finished products still need to be warehoused and stored for a long time before they can be shipped, vacuum testing should be performed again on the water cups to be shipped before shipment. This test can completely select the defective water cups that did not show obvious performance before, such as faulty soldering and air leakage.

A friend here will ask, since you have said so, according to the truth, the insulation cups in the market should have good thermal insulation performance. Why do you find that some thermos cups are not insulated when you buy water cups? Eliminate the reason why some factories do not do vacuum test repeatedly. There are also vacuum breaking phenomena caused by long-distance transportation, and vacuum breaking phenomena caused by dropping of water cups during multiple handling.

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