Does rubbing the warmer speed up the heating? by Shuai & Mei Daily Products (Qingdao) Co., Ltd.
Dose rubbing the warmer speed up the heating?
Why are you using double layer packaging on warmer?
The outer layer is a conventional airtight outer bag, used to isolate the air, oxygen needs to be involved in the use, so the inner layer of non-woven bag made of microporous breathable film.