Tea packaging is indispensable for tea storage, shelf life, transportation and sales. Unreasonable or imperfect packaging tends to accelerate the loss of color and aroma of tea. Good packaging not only can reduce the loss of quality of tea from production to sales, but also can play a good advertising effect. Tea is an important means of commodity value and use value.
There are many kinds of tea packaging, and their purpose and role are different. From the perspective of use, it is divided into transport packaging and gift packaging. Transport packaging from the role of quality, but also easy to handle and warehousing; gift packaging in addition to quality, but also take into account the decoration and landscaping features. The volume of packaging, there are two kinds of large packaging and small packaging. Large packaging is mainly used for large-scale storage and transportation; small packaging is to better meet the needs of consumers at different levels. No matter what kind of packaging, the selection of its materials must prevent moisture, gas, and shading. Because various packaging materials have different physical properties such as moisture permeability and air permeability, the effect of preventing the deterioration of tea leaves is also very different. In the past, the general retail tea leaves in the commercial sales department were packaged in kraft paper or tin foil as packaging materials, and high-grade tea was loaded with iron. With the development of the material industry, great changes have taken place in the tea packaging materials. The replacement of the packaging and method has greatly improved, such as the emergence of multi-layer composite materials in recent years, so that the nitrogen filling and packaging of tea leaves a practical, universal stage, and its cost and use are better than the original iron listening. Much more. At present, most of the new films used for tea packaging have good gas barrier properties, which can better prevent the intrusion of water vapor and the escape of tea aroma in packaging bags, and have excellent processing performance, convenient heat sealing, free style, and certain mechanical properties. Strength and chemical resistance, in line with the health standards of packaged foods. Although the cost of the composite film is relatively high, it is indeed an excellent packaging material. At present, the tea packaging films commonly used by manufacturers include: ordinary cellophane, polyethylene film (having high and low pressure or low, high density), polypropylene film, polyester film, nylon film, and using these materials in three or even five layers. Layer composite composite packaging film, such as cellophane/polyethylene composite film, stretched polypropylene/polyethylene/unstretched polypropylene composite film. These materials are generally used as small packaging materials. Usually when selecting, the moisture permeability should be less than 1 (unit: g/m2/day) as far as possible. The oxygen permeability is relatively suitable when the moisture permeability is similar. Mao tea produced by farmers is transferred to a refined tea factory for processing after being acquired by a purchase station or a tea factory. This large amount of tea, in the course of transportation packaging, in the past used bag packaging, in recent years began to promote the use of sacks lined with plastic bags or coated plastic sacks, its moisture-proof effect is better. The packaging of finished tea is more elaborate. The packaging for export tea is plywood box made of plywood. The inside of the box is lined with aluminum foil kraft paper. Most of the domestic tea is made of plastic moisture-proof bags inside the carton. Large-scale storage of oolong tea and black tea usually uses the carbon method. The method and principle are generally the same as the lime block storage, with charcoal as the moisture absorption material. The method is to burn the charcoal first and then cover it with a brazier or a crock, so that the charcoal can be extinguished without oxygen. 100 grams of charcoal packed in a clean cloth is placed in a tea jar or small tin bucket. The tea bag wrapped in soft white paper is then loaded. The mouth of the can or bung is covered with several pieces of soft paper, and the pressure is smooth. Wooden boards, to prevent the leakage of tea and external humid air into people, generally can achieve better preservation effect.
Air-purging and nitrogen-filled packaging is a new method for the storage of famous teas in recent years, and its use is more common. The method is to first dry the tea to a moisture content of about 5%, not more than 6%, into the aluminum foil composite bag, the bag mouth is sealed with a heat sealing device. The air in the bag was pumped out with a breather type nitrogen-purging machine, and was filled with pure nitrogen, sealed and sealed, and placed in a tea box for storage. The pumping and nitrogen-filled packaging can generally be stored for 8 months. If it is sent to a cold room, it will still have better quality after one year.
Source: Tea Science and Technology