Food self-contained zipper bag contains desiccant and clearly marked: not edible. The effect of desiccant is obviously to reduce the humidity of food in the food bag and prevent the food from spoilage. There are five kinds of desiccant
1、 Silica gel desiccant
The raw material is a kind of water containing silica with high microporous structure, which is colorless, tasteless and nontoxic, with stable chemical properties and good hygroscopicity. It is widely used in instruments, instruments, leather, bags, food, textiles, equipment and equipment. Its function is to control the relative humidity of the environment in the process of storage and transportation, so as to prevent articles from being affected by moisture, mildew and corrosion. It should be noted that this is the only desiccant approved by the EU.
2、 Fiber desiccant
It is made of pure natural plant fiber and refined by special process. It is worth mentioning that the film coated fiber desiccant sheet saves space and is convenient and practical. Its moisture absorption capacity is equivalent to its own weight, far higher than that of other desiccants. Because of its moderate price, safety and health, it is the best choice for many health products, medicines and biological desiccants.
3、 Montmorillonite desiccant
The desiccant is widely used in medical and health care, food packaging, optical instruments, electronic products, military products and civil products, which can not be sealed or sealed by weather. Due to the use of pure natural raw materials, bentonite has the characteristics of strong adsorption capacity, fast adsorption speed, tasteless and non-toxic, no environmental pollution, no contact corrosion, green environmental protection, tasteless and non-toxic, no harm to human body, good adsorption performance, adsorption activity, static moisture reduction and odor removal.
4、 Quick lime desiccant
Middle school chemistry class has talked about quicklime, its main component is calcium oxide, through chemical reaction to achieve water absorption, with irreversibility. The most common is the use of this type of desiccant in "snow cake". In addition, it is also commonly used in electrical appliances, leather, clothing, shoe-making, tea, etc., but because quicklime belongs to strong alkali and has strong corrosivity, sometimes the eyes of the elderly and children are injured, so it is being gradually eliminated.
5、 Calcium chloride desiccant
Calcium chloride is mainly made from high-quality calcium carbonate and hydrochloric acid through reaction synthesis, filtration, evaporation concentration, drying and other processes. It is used as calcium strengthening agent, chelating agent, curing agent, drying agent and so on in food industry. At the same time, it is also used as a gas desiccant to produce ether, alcohol, propylene resin and so on. Calcium chloride is mostly porous block, granular or honeycomb raw materials, odorless, slightly bitter taste, dissolved in water colorless.
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