The packaging materials are:
One, PE bag (plastic bag)
Polyethylene bags, 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 have greater moisture permeability and air permeability, and high-density PE bags are smaller.
The advantages of PE bags are economy, low cost, 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.
Two, metal tin can
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 the inner packaging of PE bags. However, due to the high price and easy corrosion and deformation, they have been gradually eliminated. The paint smell in the metal tin and the tightness of the lid are not enough to be used alone.
Three, synthetic paper cans
Synthetic paper cans are currently the most widely used packaging materials. It has the advantages of economy, lightness, and beauty. It only has high air and moisture permeability, and it is not suitable to be used alone. It is best to use PE bags or aluminum foil laminated bags for inner packaging. This article is transferred from: West Lake Longjing Information Platform
Four, aluminum foil laminated bag
Aluminum foil laminated bag is beautiful and elegant. Its advantages are opaque, moisture-proof and oxygen-barrier. It is more expensive than PE bags, and it may cause extrusion problems when used alone. Aluminum foil laminated bags can be treated with vacuum or nitrogen or deoxidizers. With packaging cartons or synthetic paper cans, the storage of tea leaves can be completely protected from moisture, gas, light, and oxygen. Storage at low temperatures is the best solution for tea. Perfect preservation method.
Five, 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. Boxes or paper bags are easy to absorb moisture and break. These materials are not ideal tea packaging materials .
Six, nitrogen filling or vacuum bag packaging
Vacuum packaging is due to the shrinkage of the packaging bag. In order to avoid squeezing and collision and for the sake of beauty, it is better to add outer packaging protection. Nitrogen-filled packaging will expand the bag, and it should not be squeezed to avoid bursting the bag. Both require additional packaging, and preservation also has a good effect, but the investment is more expensive.
Food bag paper plastic composite bag
