How to tell if the thermos cup is warm?
May 22, 2022
How to judge whether the thermos cup is warm:1. Identification of the thermal insulation of the inner bladder.This is the main technical indicator of the thermos cup. After filling with boiling water, tighten the cork or lid clockwise. After 2 to 3 minutes, touch the outer and lower parts of the cup body with your hands. The warm phenomenon means that the inner tank has lost the vacuum degree and cannot achieve a good thermal insulation effect.Second, identify the sealing performance.Fill a glass of water and invert it for four or five minutes, screw the lid tightly, place the cup flat on the table, or shake it a few times. Whether the rotation is flexible and whether there is a gap.Third, the identification of environmental protection accessories.The environmental protection of plastic accessories is also a concern, which can be identified by smell. If the cup is made of food-grade plastic, the smell is small, the surface is bright, there is no burr, and the service life is long and not easy to age; ordinary plastic or recycled plastic is The smell is strong, the color is dark, the burrs are many, and the plastic is easy to age and break.
