When necessary, after tearing off the OPP film, put the heating package into a high-temperature box, add a certain amount of normal-temperature water, and prohibit hot water. After the chemical reaction, the temperature can be quickly raised, and the ingredients in the bag can be heated and cooked. During the heating process, the temperature of heating package can reach above 150℃, and the temperature of steam can reach 200℃.
Before using the heating package, read the usage and precautions on the package, standardize the operation, and don't block the air outlet at the top of the package. It is important to note that the heating package is inedible. Don't let children tear or even eat the raw materials in the heating package by mistake. Self-heating food packaging boxes are best heated on insulation pads, not on glass, plastic and other countertops. During heating, never touch the box with your hands and stay away from the steam.
The function of quicklime
Quicklime is a commonly used desiccant, which removes water vapor through chemical absorption, and is also used in steel, pesticides, medicine, desiccant, tanning and alcohol dehydration. It is especially suitable for puffed food, mushrooms, fungus and other local products, as well as products in instruments, medicine, clothing, electronic communication, leather, textile and other industries.
In the process of hardening, lime will evaporate a lot of water, resulting in significant volume shrinkage and prone to dry shrinkage cracks. Therefore, lime should not be used alone. Generally, materials such as sand, paper reinforcement and hemp knife should be mixed to reduce shrinkage, increase tensile strength and save lime. Lime is strongly alkaline, and can react with glassy activated silica or activated alumina at room temperature to produce hydraulic products, resulting in cementation. Therefore, lime is still an important raw material for building materials industry.
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