The packaging materials are:
1. PE bags (plastic bags)
Polyethylene bags, namely PE bags, are currently widely used packaging materials. Generally, there are two types of low-density PE bags and high-density PE bags. Low-density PE bags are moisture-permeable, The air permeability is larger, and the high-density PE bag is smaller.
The advantages of PE bags are economy, cheapness, and good moisture resistance. The disadvantages are that they have poor light transmission and gas resistance and cannot be individually used for tea bag packaging. It is best to use polyethylene bags to add a layer of external packaging that can block light and have low air permeability, such as synthetic paper cans, iron cans, etc.: PE bags have greater air permeability and it is difficult to solve the oxygen problem in the packaging bag, which is not ideal The packaging material.
2. Metal tin
cans The advantages of metal tin cans are extrusion resistance and good texture. In the early days, they were mainly used for the outer packaging of tea bags with PE bags . However, due to their high price and easy corrosion and deformation, they have been gradually eliminated. The paint smell inside the metal tin and the tightness of the lid is not enough, so it is not suitable to be used alone.
3. Synthetic paper cans
Synthetic paper cans are currently the most widely used packaging materials. Its advantages are economy, lightness, and beauty. Only air and moisture permeability are still high, and it is not suitable to be used alone. It is best to be used with PE bags or aluminum foil laminated bags. inner packaging. This article is transferred from: West Lake Longjing Information Platform
4. Aluminum Foil Laminated Bags The
aluminum foil laminated bag is beautiful and elegant, and its advantages are opaque, moisture-proof and oxygen-resistant. The price is more expensive than PE bags, and it will cause extrusion problems when used alone. . The aluminum foil laminated bag can be treated with vacuum or nitrogen or deoxidizer. With packaging cartons or synthetic paper cans, the storage of tea can be completely protected from moisture, gas, light, and oxygen. Storage at low temperatures is the best solution for tea. Perfect preservation method.
5. Glass jars, magnetic jars, wooden boxes, paper boxes
Although glass jars have excellent gas and moisture resistance, they are transparent, fragile, heavy and expensive. Magnetic pots or earthenware pots can be protected from light but are similar to glass pots. They are fragile and heavy. Improper handling of wooden boxes can easily cause tea to absorb peculiar smell and moisture and breathe. The paper boxes or paper bags are easy to absorb moisture and break. These materials are not ideal tea packaging materials. .
6. Nitrogen- filled or vacuum bag packaging
Vacuum packaging is due to shrinkage of the packaging bag. In order to avoid re-squeezing and collision and for the sake of aesthetics, external packaging protection should be added. Nitrogen-filled packaging will inflate the bag, and it should not be squeezed to prevent the bag from bursting. Both require additional packaging, and the preservation also has a good effect, but the investment is more expensive.