Plastic Packaging Bags, including three-side sealing bags, back-sealing bags, four-side sealing bags and other different styles, simply understand that the three-side sealing bag is to seal the three sides of the packaging bag, and stuff from the top seal The four-side sealing bag is a perfect product after passing the production line, and the back-seal bag is used to package the plastic packaging from the middle. Below is a description of the difference between the back-seal bag and the three-side-seal bag.
1. Back seal bag
Back-sealed bags are also called middle-sealed bags. Simply put, they are packaging bags that are sealed on the back of the bag. The application of back-sealed bags is very wide. Generally, candy, instant noodles in bags, and dairy products in bags are used. This type of packaging. The use of back-sealed bags to package rice can ensure the quality of the rice and prevent the rice from getting wet. On the other hand, back-sealed bag packaging is not only small and convenient, but also beautiful and generous when customers buy and carry it. The weight of the back-sealed bag of rice is generally 6 or 8 kg. The back-sealed bag is just the right size to carry.
The back seal bag can be used as a food bag. It is mainly used for product packaging, storing food, medicines, cosmetics, frozen food, philatelic products, etc. It is moisture-proof, waterproof, insect-proof, and prevents things from scattering. It can be reused and it will be sealed with a single touch It's rigorous, non-toxic, tasteless, flexible, easy to seal and very convenient.
2.Three sides sealing bag
In many cases, the three-side sealing bag needs to be vacuum packed. This reason is also very diversified. Sometimes it may be to prevent food from spoiling. Sometimes it is just to make the shelf life longer. Vacuum packaging is also commonly called Decompression packaging is mainly to extract all the air in the packaging bag and then seal it, so that the inside of the bag is always in a highly decompressed state.
Not only that, the use of three-sided packaging materials has low consumption. The machine uses pre-made packaging bags with perfect packaging patterns and good sealing quality, which improves the product grade. The three-side sealing bag has excellent sealing performance, high barrier degree, ultra-low oxygen and moisture permeability, moisture-proof, pollution-proof, radiation-proof and anti-corrosion, strong mechanical properties, bright and practical appearance, non-toxic, and tasteless in accordance with national standards. At present, the best containers for packing powdered and granular products such as fertilizers, pesticides, cement, and grains are generally packed in ordinary plastic woven bags and three-sided sealed bags. The weight can be about 20kg to 50kg, which is convenient. Handling, stacking, handling and storage characteristics.
The production of back-sealed bags and three-side sealed bags are produced by different equipment, but there are also two-side and middle-sealed mechanical equipment. Because the production steps between the two are different, there will be some differences in their usefulness. However, they also have some similarities, that is, they are often used as packaging bags for products such as food.