1. Middle envelope
The middle sealing bag is also called the back sealing bag. Its application range is very wide. Generally, candy, bagged instant noodles and bagged dairy products are used in this type of packaging.
The packaging of rice is now much simpler and the packaging is in a variety of forms. Many rice bags are getting smaller and smaller, and the materials of the bags are getting more and more. We often use large bags and small vacuum bags. The use of vacuum bags to package rice is also constantly practiced and developed to finally position the vacuum bag packaging in the middle of the packaged rice.
The use of medium-sealed bags to package rice on the one hand can guarantee the quality of rice and prevent the rice from being wet. The weight of the rice in the middle envelope is generally 6 or 8 kilograms, and the size of the middle envelope is just right.
The middle sealing bag can be used as a food bag to store food, medicine, cosmetics, frozen food, philatelic products, etc. It is moisture-proof, waterproof, and insect-proof. It can be reused, and it will be tightly sealed, non-toxic and tasteless with a single press. It has good flexibility and is easy to seal.
2, three side sealing bag
The three-side sealing bag has the best air tightness, and the actual bag is generally used in this bag making method.
Three-side sealing bags require vacuum packaging in many cases. This reason is also very diversified. Sometimes it may be to prevent food from spoiling, and sometimes to make the shelf life longer. Vacuum packaging is also commonly referred to as decompression packaging. The main purpose is to extract all the air in the packaging bag and then seal it so that the bag is always under high decompression.
Not only that, the use of three-side sealing material has low loss, excellent sealing performance, high barrier, low oxygen permeability, moisture, anti-fouling, anti-radiation and anti-corrosion, strong mechanical properties, bright and practical appearance, non-toxic and tasteless. standard.