What are the requirements for tea packaging for vacuum packaging machines?
(1) Vacuum packaging machine should be protected from moisture
The moisture in the tea is the medium for the biochemical change of the tea, and the low moisture content is conducive to the preservation of the quality of the tea. The water content in tea should not exceed 5%. 3% is best for long-term storage. Otherwise, the ascorbic acid in the tea will be easily decomposed, and the color, aroma and taste of the tea will change, especially at higher temperatures, the rate of deterioration will be accelerated. Therefore, the tea vacuum packaging machine can be used for moisture-proof packaging when packaging, such as aluminum foil or aluminum foil evaporation film as the basic material of the composite film.
(2) Vacuum packaging machine to prevent oxidation
If the oxygen content is too high in the packaging of the tea vacuum packaging machine, it will cause oxidative deterioration of some components in the tea. For example, ascorbic acid is easily oxidized to become deoxyascorbic acid. Further, a pigment reaction occurs with the amino acid knot to deteriorate the taste of the tea. therefore. The oxygen content of the tea packaging must be effectively controlled below 1%. In the packaging technology of tea vacuum packaging machine. Aerated packaging or vacuum packaging can be used to reduce the presence of oxygen. The vacuum packaging technology is to put the tea into a soft and flexible film packaging bag. The air in the bag is excluded during packaging, causing a certain degree of vacuum, and then the sealing method is sealed; the air-filling technology is to inject an inert gas such as nitrogen while discharging the air, in order to protect the color, fragrance and taste of the tea. Unchanged and maintain its original quality.
(3) vacuum packaging machine to block gas
The aroma of tea leaves is easily lost, and it is easily affected by external odors. In particular, 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 and affect the fragrance of the tea. 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.
(4) Vacuum packaging machine should be protected from 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 to 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 to 15 ° C, the color of the tea leaves is slower. 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.
(5) vacuum packaging machine to 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 packaging machine must shield from chlorophyll when packaging tea leaves. Photocatalytic reactions occur in other components such as lipids. In addition, ultraviolet light is also an important factor causing deterioration of tea. Shading packaging technology can be used to solve such problems.
The biggest feature of the external vacuum packaging machine is that it can be vacuum or nitrogen-filled (or other gas) without any restrictions on the size and volume of the package. Wide adaptability, high economic efficiency, and very convenient to use. The packaging materials for this vacuum machine are composite materials such as polyester/polyethylene, nylon/polypropylene, polypropylene/polyethylene, polyester/aluminum foil/polyethylene, nylon/aluminum foil/polyethylene. The items sealed by the vacuum sealing machine have anti-mildew, anti-insect, anti-pollution, anti-oxidation, saving volume, saving freight, prolonging storage period and ensuring the quality of articles. The machine has the advantages of compact structure, small size, light weight, low power consumption, high sensitivity, convenient operation and maintenance, and the like. The whole body uses high temperature baking varnish, stainless steel console, circuit using Omron solid state relay control, domestic famous brand cylinder and solenoid valve, environmental protection vacuum pump. The working process is automatically controlled by computer board, digital tube display work process, heat sealing temperature, package of goods The vacuum degree and the extension time of the nozzle can be adjusted freely, and it is a new type of vacuum packaging machine which cannot be replaced by the internal vacuum packaging machine.