Tea is a traditional drink that our people have been drinking for thousands of years. Now it has become one of the three non-alcoholic beverages that have become popular around the world. When you rush for a cup of tea, the color of the beautiful jasper, the fragrant fragrance of people, with a bitter taste, a variety of tea-shaped, make people pleasing. However, because tea contains a variety of chemical substances, poor protection can easily deteriorate. In order to maintain the artistic charm of the color and flavor of tea, the choice of its packaging materials is very important. According to research by industry experts, blister packaging can effectively protect the quality of tea during its storage and use, and extend the shelf life of tea.

Tea packaging must have the performance

According to studies, tea contains mainly components such as ascorbic acid, tannic acid, polyphenol compounds, catechin fat, and carotene. These ingredients are all susceptible to deterioration due to oxygen, temperature, humidity, light, and environmental odors. Therefore, tea packaging must have the following properties.

Moisture resistance: The moisture content in tea should not exceed 5%, and 3% is the best for long-term storage. Otherwise, the ascorbic acid in tea is easily decomposed. Oxidation resistance: The oxygen content in the packaging must be controlled below 1%. Too much oxygen will cause oxidation and deterioration of certain components in the tea. For example, ascorbic acid is easily oxidized into deoxyascorbate, and further reacts with amino acids to cause pigmentation to deteriorate the taste of tea; shading property: Since tea contains chlorophyll and other substances, photocatalytic reaction with other components occurs easily. In addition, ultraviolet light is also an important factor that causes deterioration of tea. Therefore, the tea packaging must have good shading performance; gas barrier: the fragrance of tea is easily lost, and must be protected by packaging materials with good airtight properties; high temperature resistance: the temperature will increase the speed of oxidation of tea, and at the same time It will cause the surface of tea leaves to fade.

In order to meet the above requirements, experts believe that the use of blister packaging as a small package of tea, use and storage process can play a role in moisture-proof, anti-oxygen and gas barrier effect of tea. Then use an ordinary paper box as the middle package of tea, which can play a role in shading. The structure of the blister pack is very large. Considering the moisture resistance of tea, experts suggest that the use of plastic blister and composite plastic substrate heat sealing structure is more appropriate. Each blister is filled with enough grams (approximately 2 grams) to be used once. This kind of independent structure packaging will not affect other tea leaves during the use of tea.

Blister packaging material selection

According to the stringent requirements of moisture-proof, oxygen-proof, shading, and fragrance-preserving of tea packaging, through comparison of various existing materials, experts believe that vacuum-aluminized high barrier PVC film can meet the above requirements. Aluminized high barrier film is a new type of high barrier membrane packaging material, the main advantages are absolute sensory inertness and very low odor material permeability, transparency, elongation, rigidity, toughness, tear strength and resistance to tearing The crack strength is very good, the oxygen transmission rate is very low, and the water vapor transmission rate is also very low. In addition, its printability and sealability are good.

BOPP/AI/PE composites can be used as the substrate material. The outer layer of the material is biaxially oriented polypropylene (BOPP). After stretching, the molecules are oriented, the transparency of the film, gloss and water resistance, and the penetration of water vapor. The rate and oxygen transmission rate is 50% or less lower than polypropylene, except that the LDPE density is 20% polyethylene. However, the film's resistance to tearing is very low, as long as there is a small gap in the film, it is easy to tear it. The middle layer of material is aluminum foil. Aluminum foil has strong light-shielding properties and has high reflectivity to light and heat; it has good barrier properties, gas-impermeable body and water vapor, and has good protection. The disadvantage of aluminum foil is that it cannot be stressed, there is no heat seal, there are pinholes, and it is generally not used alone. The choice of compounding with other materials can completely solve this problem, and its barrier properties can be better applied. The inner layer of the material is polyethylene, it is non-toxic and odorless, has a good heat sealability, and its heat sealability is currently unmatched by other plastics.

The middle packaging mainly plays a role of shading and bringing together the scattered small blister packs. It is only necessary to use ordinary paper-processing cartons to meet the requirements. The carton structure can be designed into different shapes according to aesthetic requirements. The size of the carton can be selected according to market needs, such as 200g, 100g, 50g, etc.

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