Why do teas need to be vacuum packed?
Packaging is the last important process in the tea production process. In the process of circulation, tea packaging plays an important role in protecting tea, beautifying tea, promoting tea, improving the taste of tea, and the storage, transportation, consumption and use of tea, especially in recent years, through exquisite packaging. Increasing the added value of advertising tea and advertising effects has also become an important function.
Why do teas need to be vacuum packed?
1. Anti-mold and mildew deterioration is mainly caused by the activity of microorganisms, and the survival of most microorganisms (such as mold and yeast) requires oxygen, and vacuum packaging uses this principle to put the inside of the bag and the tea/food cells. The oxygen is pumped away, causing the micro-objects to lose the "environment of survival."
2. Anti-high temperature Temperature is an important factor affecting the quality change of tea. The temperature difference is 10 °C, and the rate of chemical reaction is 3-5 times. Tea leaves will exacerbate the oxidation of the contained substances at high temperatures, resulting in the rapid reduction of effective substances such as polyphenols and the deterioration of quality. The storage temperature of tea leaves is best below 5 °C. At 10-15 ° C, the color of the tea decreased slowly. The color effect can also be maintained. When the temperature exceeds 25 ° C, the color of the tea leaves will change faster. Therefore, the tea leaves are suitable for storage at low temperatures.
3, anti-oxidation Tea vacuum packaging machine packaging oxygen content will lead to oxidation of some components of tea. therefore. The oxygen content of the tea packaging must be effectively controlled below 1%. In the packaging technology of tea vacuum packaging machine, the inflation packaging method or the vacuum packaging method can be used to reduce the presence of oxygen.
4. Shading light can promote the oxidation of chlorophyll and lipids in tea, increase the odorous substances such as valeraldehyde and propionaldehyde in tea, and accelerate the aging of tea. Therefore, tea vacuum packaging machine must shading when packaging tea leaves. To prevent photocatalytic reactions of other components such as chlorophyll and lipids. In addition, ultraviolet light is also an important factor causing deterioration of tea. Shading packaging technology can be used to solve such problems.
5, gas barrier Tea fragrance is very easy to lose, and is easily affected by external odor, especially the residual solvent of the composite film and the odor of the electric iron treatment and heat sealing treatment will affect the flavor of the tea, so that the fragrance of the tea is affected. Therefore, the tea vacuum packaging machine must avoid the fragrance from the package and the odor absorption from the outside when packaging the tea leaves. Tea packaging materials must have certain barrier properties.
6. Moisture-proof The moisture in tea is the medium for the biochemical change of tea. The low moisture content is conducive to the preservation of tea quality. The water content in tea should not exceed 5%. 3% is best for long-term storage. Otherwise, the ascorbic acid in the tea will easily decompose, and the color, aroma and taste of the tea will change. Especially at higher temperatures, the rate of deterioration will increase. Therefore, the tea vacuum packaging machine should have good moisture-proof performance on the packaging. For example, the composite film such as aluminum foil or aluminum foil evaporation film is used as a packaging material for moisture-proof packaging.
7. Inflatable packaging There are some other teas that are not allowed to be vacuum-packed, such as crispy and fragile tea leaves, agglomerated tea leaves, easily deformed tea leaves, tea leaves with sharp edges or high hardness that will pierce the packaging bags, etc. The food is also the same. After the food is vacuum-insulated, the inflation pressure in the packaging bag is stronger than the atmospheric pressure outside the packaging bag, which can effectively prevent the food from being crushed and deformed without affecting the appearance and printing decoration of the packaging bag. For example, green tea, Longjing and the like are not suitable for vacuum packaging, and can be vacuum-packed with nitrogen filling.
After reading the above introduction, I believe everyone has some understanding of why tea is to be vacuum packed . If you do not understand, please visit Zhongshan Fengxing Packaging official website: or call us. Zhongshan Xiaolan Town Fengxing Packaging Machinery Factory, international packaging machinery expert, the first brand of domestic explosion-proof vacuum packaging machine, the main manufacturer of Guangdong packaging machinery.