The inability to open the lid of a thermos cup may be caused by various reasons. Here are some common solutions:
1. Utilize the principle of thermal expansion and contraction
(1) Hot water soaking method: Turn the thermos upside down, soak the lid part in hot water for a few minutes, let the lid expand due to heat, and then try to unscrew it.
(2) Cold compress method: If the thermos cup is filled with hot water and the lid cannot be opened, you can try using an ice pack or a cold towel to apply it to the lid to make it shrink when it gets cold, making it easier to unscrew.
2. Increase friction
(1) Use towels or rubber gloves: Wrap the lid with a towel or rubber gloves to increase the friction between the hand and the lid, and then twist it open with force.
(2) Rubber band method: Wrap a few circles of rubber bands around the edge of the lid, and then twist the lid to increase friction.
3. Release stress
(1) Pressing method: If the lid cannot be opened due to the pressure difference inside the thermos cup, you can try pressing the edge of the lid to allow air to enter, balance the internal and external pressure, and then unscrew the lid.
(2) Inverted method: Invert the thermos for a while to bring the liquid close to the lid, then gently twist the lid to use the pressure of the liquid to help release internal pressure, and then unscrew it normally.
4. Utilize tools
(1) Plier method: Gently clamp the edge of the lid with pliers, then slowly unscrew it, but be careful not to damage the lid.
(2) Screwdriver method: If there is a gap in the lid, you can use a screwdriver to gently pry the gap to allow air to enter, and then unscrew the lid.
If none of the above methods can open the lid, it may be a quality issue with the thermos itself. It is recommended to contact the manufacturer’s after-sales service for assistance.
