As a traditional packaging material, tin cans are often used to store food, especially biscuits, tea and other foods that are susceptible to moisture and deterioration. Tin cans are not only beautiful in appearance, but also have good sealing properties, and are considered by many consumers to be ideal food storage containers.
So, can tin cans really keep biscuits fresh? This article will explore the material properties, preservation principles, actual effects and consumer experience of tin cans to reveal the actual role of tin cans in preserving biscuits.
Material properties of tin cans
1. Material structure
Tin cans are usually made of tinplate, which is a metal material with tin plated on iron sheet, with good corrosion resistance and strength. The tin layer can effectively prevent the iron sheet from contacting with moisture and oxygen in the air, thereby extending the service life of the metal.
2. Sealing performance
The sealing performance of tin cans is one of its main advantages. Through reasonable design, the tin can lid is tightly combined with the can body, which can effectively block air, moisture and microorganisms from entering the can, preventing food from getting damp, oxidized and deteriorating.
3. Aesthetics and retro
Tin cans usually have exquisite appearance design with retro style. They can be used as food storage containers and decorations, and have high ornamental value.
Tin can preservation principle
1. Moisture-proof function
Moisture is one of the main factors that cause biscuits to deteriorate. When biscuits absorb moisture from the air, they will become soft and lose their crispness, thus affecting the taste. The sealing performance of the tin can can effectively isolate external moisture and keep the biscuits dry.
2. Anti-oxidation function
Oxygen is an important cause of food oxidation and deterioration. The oil in the biscuits will undergo oxidation reaction under the action of oxygen, producing odor and harmful substances. The sealing design of the tin can can reduce the contact between biscuits and air and delay the oxidation process.
3. Anti-microbial function
Microorganisms are another important factor in food deterioration. The sealing performance of the tin can can prevent external microorganisms from entering the can, thereby reducing the risk of microbial contamination of biscuits and extending the shelf life of food.
Practical verification of the preservation effect of tin cans
1. Experimental method
In order to verify the preservation effect of tin cans on biscuits, the following experiment can be conducted: put the same number and type of biscuits into tin cans and ordinary plastic bags respectively, place them under the same environmental conditions (such as temperature and humidity) for a period of time, and then test the moisture content, oil oxidation degree and microbial count of the two respectively.
2. Experimental results
● Moisture content: The moisture content of biscuits in tin cans is significantly lower than that in plastic bags, indicating that tin cans have good moisture-proof properties.
● Oil oxidation degree: The oxidation degree of biscuits in tin cans is low, and there is no obvious odor and discoloration, indicating that tin cans can effectively prevent oil oxidation in biscuits.
● Microbial count: The number of microorganisms in biscuits in tin cans is significantly less than that in plastic bags, indicating that tin cans can reduce the growth of microorganisms.
3. Consumer experience
Through surveys and feedback from consumers, many people believe that biscuits stored in tin cans are drier, taste better, and have a longer shelf life than biscuits stored in ordinary plastic bags. These feedbacks are consistent with the experimental results, further proving the advantages of tin cans in biscuit preservation.
Other applications of tin cans
1. Tea leaves
Tea leaves have high requirements for the storage environment, especially moisture-proof, anti-oxidation and anti-odor. The sealing and anti-corrosion properties of tin cans make them an ideal container for tea storage, which can effectively maintain the aroma and taste of tea leaves.
2. Coffee beans
Coffee beans also require good storage conditions. Tin cans can effectively prevent coffee beans from moisture and oxidation, and maintain the freshness and aroma of coffee beans.
3. Candy
Candy is easily damp and softened, affecting the taste. Using tin cans to store candy can keep it dry and extend its shelf life.
Precautions for the use of tin cans
1. Check the seal regularly
Although tin cans have good sealing properties, the can lid and the can body may deteriorate in sealing performance due to wear or deformation during long-term use. Therefore, it is recommended to check the sealing of the tin can regularly to ensure that its sealing performance is intact.
2. Avoid collision and falling
Tin cans should avoid collision and falling during use to prevent deformation or damage to the can body, which will affect its sealing performance and service life.
3. Keep it clean
Before using tin cans to store food, make sure the inside of the can is dry and clean to avoid residual moisture and impurities that affect the preservation of food.
Conclusion
Tin cans can effectively maintain the freshness of biscuits and extend their shelf life with their excellent sealing and antiseptic properties. Through reasonable use and maintenance, tin cans can not only play a good preservation effect, but also add a sense of retro and beauty to life.