How to prevent the contents of Small Round Metal Can from getting damp

1. Choose a metal can with high sealing performance
Structural design optimization
Preferably choose metal cans with crimping sealing technology (such as traditional food cans). The mechanical crimping of the can body and the can lid forms a tight seam, which can effectively block external water vapor with the internal rubber sealing ring. Avoid choosing snap-on or screw-on metal cans (if there is no silicone sealing ring). This type of structure may cause the seal to age due to long-term use, reducing moisture-proof performance.
Example: Metal cans for tea often use a double sealing design (inner aluminum foil film + outer crimping cover), which has better moisture-proof effect than ordinary containers.
Material and process guarantee
Tin-plated steel plate (tinplate) or aluminum alloy material is selected. The surface coating can enhance the corrosion resistance and prevent the can body from rusting and breaking due to moisture. The inner wall is sprayed with food-grade epoxy resin coating, which can not only avoid direct contact between metal and food, but also reduce the adhesion of condensed water (such as when taken out after refrigeration).
2. Use of moisture-proof auxiliary materials
Use of desiccant
Built-in desiccant bag: Put food-grade silica gel desiccant or montmorillonite desiccant in the can (need to be wrapped in breathable packaging to avoid direct contact with food), especially suitable for storing dry goods with strong hygroscopicity such as nuts, milk powder, coffee powder.
Deoxidizer synergy: For foods containing oil (such as baked snacks), deoxidizers can be put in at the same time to inhibit mold growth through the dual mechanism of absorbing oxygen and moisture.
Sealing film or aluminum foil lining
Some metal cans are equipped with heat-sealable aluminum foil lining. After filling the food, the aluminum foil is bonded to the can mouth by heating (such as a household sealing machine) to form a secondary sealing layer. For example, when making a homemade moisture-proof tea can, you can cover the can mouth with a layer of aluminum foil and then tighten the lid to further enhance the sealing.
3. Control the storage environment
Temperature and humidity management
Metal cans should be stored in a cool and dry place, avoiding exposure to high temperature (>30℃) or high humidity environment (humidity>70%). High temperature will accelerate the expansion of air in the can, which may cause the seal to fail; a humid environment will easily cause the can to rust and destroy the structural integrity.
Scenario suggestion: When storing in the kitchen, avoid placing metal cans next to the sink or on top of the refrigerator (easy to condense water vapor), and choose a dry area on the upper layer of the cabinet.
Avoid sudden temperature changes
When taking out the metal can from the refrigerator, it is necessary to wipe off the condensed water on the surface in time, or wait for the can temperature to rise to room temperature before opening it to prevent the internal food from "re-moisture" due to the temperature difference (such as biscuits softening when encountering condensed water).
IV. Pretreatment and maintenance before use
Drying treatment
New cans need to be thoroughly cleaned and dried before use to ensure that there is no residual moisture on the inner wall; old cans that are reused need to check whether the sealing strips are aging and whether the can body has dents and damage. If rust or deformation is found, it should be eliminated immediately.
Classification storage principle
Highly hygroscopic foods (such as brown sugar and milk powder) need to be sealed separately, and avoid being in the same can with high-water content ingredients (such as mixed dried fruits) to prevent moisture migration.
5. Special scenario enhancement plan
Long-term storage of dry goods: You can use the "metal can + vacuum bag" double protection method. First put the food into a vacuum bag to evacuate it, and then put it into a metal can to seal it. It is suitable for grains that need to be stored for a long time, such as rice and beans.
Outdoor moisture-proof needs: The metal cans carried when camping can be wrapped with waterproof tape or put into waterproof storage bags to cope with humid environments in the wild.
If you want to know how to prevent the contents of Small Round Metal Can from getting damp, you can contact the professional technicians of Huatai Packaging Products, and we will do our best to help you!