What is a four sided sealed bag? Why are four sided sealed bags so popular?

Four sided sealed bags, also known as heat sealed bags or pressure bags, are one of the most common types of packaging bags in our daily lives and are commonly used in bag type automatic packaging machines. After the bag is formed, all four edges are heat sealed, resulting in a three-dimensional shape and good packaging effect for the packaged object. It is commonly used for packaging food (such as dried fruits, tea, snacks), medical supplies (such as medicine powder), daily consumer goods, and other items.
Advantages of Four sided Sealed Bags
1. Excellent anti fouling and moisture-proof effects
The four sided sealed bag has good sealing performance, low oxygen permeability, and can effectively prevent air, moisture, pollutants, and other substances from entering the packaging bag. Good puncture resistance, moisture resistance, and stain resistance. The heat sealing performance of the four sided sealed bag is good, and after vacuum pumping, it can efficiently extend the shelf life of food.
2. Save packaging space
The four sided sealed bag packaging has a good three-dimensional shape, which can fully utilize the packaging space, facilitate storage and transportation, and also facilitate multiple recycling.
3. Strong antioxidant properties
Four sided sealed bags are resistant to steaming and boiling, with strong oxidation resistance and anti-static properties, effectively protecting items from external environmental influences and extending shelf life.
4. The appearance is grand and classy
The appearance of the four sided sealed bag is atmospheric, making it easy to highlight the effect of pattern design and trademark, which can reflect the product grade and be unique.
The main finished products of four sided sealed bags are as follows:
1、 OPP, PET, CPP, nylon aluminum plated composite packaging bags;
2、 OPP, PE, CPE, PP and other blank or multi colored hanging card bags, self-adhesive bags;
3、 PE, PO, PP, CPP, OPP and other sizes of express bags, flat pocket accordion bags;
4、 PVC zipper bag, handbag, eco-friendly bag, etc.
The printing process of four sided sealed bags
Four sided sealed bags are usually made by dividing a whole packaging film into two halves, aligning one side, and then using methods such as overall heat sealing or individual cutting. The production process has strong adaptability, high stability, and strong replicability.