1. Polyethylene bags (plastic bags) Polyethylene (polye thylene, PE) bags are the most widely used packaging materials. - Generally, there are two types of low-density PE bags and high-density PE bags. Low-density PE bags have high moisture permeability and air permeability, while high-density PE bags are small. The advantages of polyethylene bags are economy, cheapness, and good moisture resistance, but their disadvantages are poor light transmission and gas resistance, and cannot be used for tea packaging alone. It is best to use polyethylene bag packaging with a layer of outer packaging that can block light and low air permeability, such as synthetic paper cans, iron cans, etc. Polyethylene bags have high air permeability, and it is difficult to deal with the oxygen problem in the packaging bags, so they are not the packaging materials of interest.
2. Metal tin cans The advantages of metal tins are resistance to kneading and good texture. In the early stage, the inner packaging of PE bags was mainly used for the outer packaging of tea, but because of its high price and easy corrosion, rust and deformation, it has been gradually selected. The smell of paint and the tightness of the lid in the metal tin can cannot be used alone.
3. Synthetic paper cans Synthetic paper cans are the most widely used packaging materials. Its advantages are economical, simple and beautiful, but the air permeability and moisture permeability are still high, and it is not suitable to be used alone. inner packaging.
Fourth, the aluminum foil laminated bag The aluminum foil laminated bag is beautiful and generous, and its benefits are opaque, moisture-proof and oxygen-resistant, but the price is more expensive than the PE bag, and there will be kneading problems when used alone. The aluminum foil laminated bag can be vacuumed or filled with nitrogen or deoxidizer, and it can be combined with the packaging of paper boxes or synthetic paper cans, so that the tea storage can be completely processed to prevent moisture, gas, light, and oxygen. Perfect preservation method.
5. Glass jars, magnetic jars, wooden boxes, carton boxes Although glass jars have excellent gas and moisture resistance, they are light-transmitting, fragile, heavy and expensive. Porcelain or earthenware jars can be protected from light, but similar to glass jars, they are fragile and heavy. If the wooden box is not handled properly, it will easily cause the tea to absorb odor and absorb moisture and breath. The carton or paper bag is easy to break due to moisture absorption. None of these materials are interesting tea packaging materials.
6. Nitrogen-filled or vacuum packaging Vacuum packaging will shorten the packaging bag. In order to avoid kneading, bumping, and beauty, outer packaging protection should be added. Nitrogen-filled packaging will expand the bag, and do not knead to prevent the bag from bursting. Both require additional packaging, and both have excellent preservation effects, but the investment is more expensive. Return to Sohu, see more
