The moisture in tea leaves is the medium for tea biochemical changes, and low moisture content is beneficial to the preservation of tea quality. The moisture content in tea should not exceed 5%. 3% is best for long-term storage. Otherwise, the ascorbic acid in the tea is easily decomposed, and the color, fragrance and taste of the tea will change, especially at higher temperatures, and the deterioration will be accelerated. Therefore, the tea vacuum packaging machine can be used with good moisture resistance when packaging. For example, aluminum foil or aluminum foil evaporated film as the base material of the composite film for moisture-proof packaging packaging materials.
How to treat too much oxygen in the packaging of tea vacuum packaging machine will lead to oxidative deterioration of some components in tea. If ascorbic acid is easily oxidized into deoxy ascorbic acid. And further reacted with the amino acid knots to make the tea taste worse. therefore. The oxygen content in tea packaging must be effectively controlled below 1%. Tea vacuum packaging machine packaging technology. Inflatable packaging or vacuum packaging can be used to reduce the presence of oxygen. Vacuum packaging technology is to put tea into a soft airtight film packaging bag. When packing, the air in the bag is excluded, resulting in a certain degree of vacuum, and then the method of sealing and sealing is adopted. Inflatable packaging technology is to inject inert gas such as nitrogen while discharging the air in order to protect the color, fragrance and taste of the tea. No change, keep its original quality.
(3) Air proof
The flavor of tea leaves is easily lost, and it is easily affected by the odor of the outside world. In particular, the residual solvent of the composite film and the odor from the electric ironing process and the heat sealing process all affect the flavor of the tea and affect the flavor of the tea. Therefore, the tea vacuum packaging machine must avoid escaping the fragrance from the package and absorbing the odor from the outside when packaging tea. Tea packaging material must have a certain barrier gas properties.
(4) high temperature proof
Temperature is an important factor affecting the quality of tea. The difference in temperature is 10°C and the rate of chemical reaction varies by 3 to 5 times. Tea at high temperatures will exacerbate the oxidation of contained substances, leading to the rapid reduction of effective substances such as polyphenols and accelerating quality deterioration. The best storage temperature for tea is below 5 °C. At 10～15°C, the color of tea leaves decreases slowly. The color effect can be maintained well. When the temperature exceeds 25°C, the color of the tea will change rapidly. Therefore, tea leaves are suitable for preservation at low temperatures.
Light can promote the oxidation of chlorophyll and lipids in tea leaves, increase odor substances such as valeraldehyde and propionaldehyde in tea, and accelerate the aging of tea. Therefore, tea vacuum packaging machines must be shaded to prevent chlorophyll when packaging tea leaves. Photocatalytic reactions occur with other components such as lipids. In addition, ultraviolet light is also an important factor causing the deterioration of tea. Solve this type of problem can use shading packaging technology.
The most important feature of the external vacuum packaging machine is that it is not limited by the size and volume of the packaging, and it can be vacuum or nitrogen (or other gas) packaging. Wide adaptability, high economic benefits, and easy to use. This vacuum machine is suitable for packaging materials for a variety of composite films such as polyester / polyethylene, nylon / polypropylene, polypropylene / polyethylene, polyester / aluminum foil / polyethylene, nylon / aluminum foil / polyethylene and other composite materials. The items packaged by Dingye Tea Vacuum Packaging Machine have anti-mildew, insect-proof, anti-pollution, anti-oxidation, volume saving, extended storage period, and guarantee the quality of the articles.
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