1. The role of moisture-proof packaging bags
and the materials to be packaged For products that will be affected by treatment after moisture absorption, moisture-proof packaging bags are very important. The moisture-proof packaging bag can prevent the goods from being damaged by external moisture during storage and transportation. For example, medicines, crispy foods, close-fitting instruments, metal products, etc. will decrease in quality after being exposed to moisture, or even lose their use value. Moisture-proof packaging bags are also very important for products that have a lot of moisture and will be affected when they lose their moisture. For example, after bread, cakes, cosmetics, etc. lose their own moisture, the control will be reduced, and even Lost use value. From the perspective of moisture-proof packaging bags, the packaged materials can be roughly classified as follows: ① Hygroscopicity: low moisture content: absorption of external moisture has an impact on quality. The moisture-proof packaging bag can prevent products from absorbing moisture, such as medicines and cement. High water content: The quality of the product will decrease if it loses water. The moisture-proof packaging bag can avoid water loss, such as bread, cosmetics, etc. ②Non-hygroscopicity: The product itself has no hygroscopicity, but it has an image of product quality in a high-humidity environment. The product can be separated from a high-humidity environment, such as metal, through a moisture-proof packaging bag. 2. Hygroscopic articles. There are many types of hygroscopic packaging materials. From the perspective of moisture-proof packaging bags, they can be divided into the following three types: 1. Products with dilution isotherms absorb moisture in the air or evaporate moisture into the air Later, it increased or decreased the water content of the pigeons. The proportion of this change decreases with the increase of time, and finally reaches a state where it no longer absorbs moisture or dehumidifies. As long as the temperature and humidity conditions in the air do not change, the moisture content of the product will not change. Therefore, under certain temperature and humidity conditions, the moisture content of the product is certain when the moisture of the product is balanced with the moisture of the outside world. At this time, the moisture contained in the product is called equilibrium moisture. At a certain temperature, the higher the humidity of the air, the greater the corresponding equilibrium moisture. When the relative humidity of the environment with a certain temperature drop is plotted against the equilibrium moisture of the product, the moisture absorption isotherm of the product can be obtained. In moisture-proof packaging that prevents moisture absorption or dehumidification of the packaged product, the moisture absorption or dehumidification isotherm is very important. 2. Products with balanced humidity. Chemical fertilizers, industrial medicines and other products with inorganic salts as the main components all have a certain balance of humidity. Generally, the equilibrium humidity changes with changes in temperature, but the equilibrium humidity of table salt at room temperature hardly changes with changes in temperature. For packaged products with balanced humidity, when the relative humidity of the outside world is higher than the equilibrium humidity of the product, the product absorbs the moisture of the air, so that the air humidity of the packaging space tends to the equilibrium humidity of the product; when the relative humidity of the packaging space is When the humidity is lower than the equilibrium humidity of the product, the product evaporates moisture into the air, so that the air humidity in the packaging space tends to the equilibrium humidity of the product. 3. Liquid products. For water solution or water emulsion products such as beverages and cosmetics, the relative humidity inside the packaging container can be as high as 90%-100%. Such products should be packaged in moisture-proof packaging to prevent the loss of water and dispersion and affect product quality. 3. Non-hygroscopic products, such as glass, ceramics, metals, etc., are non-hygroscopic. This kind of product itself does not contain moisture or is not hygroscopic, but some non-hygroscopic products also need to be moisture-proof packaging, especially metal products, for the purpose of preventing rust, it is necessary to prevent moisture.
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