1. Back sealing bag
Back sealed bags, also known as middle sealed bags, are packaging bags that have edges sealed on the back of the bag body. The application range of back sealed bags is very wide, and they are generally used in candy, bagged instant noodles, bagged dairy products, and other packaging forms. Using a back sealed bag to package rice can ensure the quality of the rice and avoid moisture. On the other hand, the back sealed bag packaging is not only compact and convenient, but also aesthetically pleasing for customers to purchase and carry. The weight of rice packaged in a back sealed bag is generally 6 or 8 kilograms, and the size of the back sealed bag is just right for easy carrying.
The back sealed bag can be used as a food bag, mainly for product packaging, storing food, drugs, cosmetics, frozen food, postal products, etc. It is moisture-proof, waterproof, insect proof, and can prevent things from scattering. It can be reused and will be tightly sealed with a light press. It is non-toxic, odorless, flexible, and easy to seal.
2. Three sided sealing bag
In many cases, vacuum packaging is required for three sided sealing bags, and this reason is also very diverse. Sometimes, it may be to prevent food spoilage, and sometimes it is to prolong the shelf life. Vacuum packaging is also known as pressure reducing packaging, mainly to extract all the air from the packaging bag and seal it, so that the inside of the bag is always in a high pressure reducing state.
Not only that, the use of three sided sealing packaging materials has low loss. The machine uses pre made packaging bags with perfect packaging bag patterns and good sealing quality, thereby improving the product grade. The sealing performance of the three sided sealing bag is excellent, with high barrier, ultra-low oxygen and humidity permeability, moisture-proof, anti fouling, anti radiation and anti-corrosion, strong mechanical performance, bright and practical appearance, non-toxic, and odorless, meeting national standards. At present, the best containers for packaging powdered and granular products such as fertilizers, pesticides, cement, and grains are generally made of ordinary plastic woven bags and three sided sealed bags, which can hold a weight of approximately 20kg to 50kg and have the characteristics of easy loading, unloading, stacking, handling, and storage.
The production of back sealing bags and triple sealing bags is carried out using different equipment, but there are also mechanical equipment that can be used for both triple sealing and middle sealing. Due to the different production steps between the two, there may also be some differences in their usage. However, there is also a certain similarity between the two, which is that they are often used as packaging bags for food and other products.
