What are the characteristics of back-sealed bags, three-side sealed bags, and four-side sealed bags? How are packaged foods different?

When it comes to plastic packaging bags, there are various packaging images that come to everyone's mind. Although we see these daily necessities every day, few people know what type they belong to. In fact, the three most common packaging bags in life are back-sealing bags, three-side sealing bags and four-side sealing bags. Then let the editor introduce to you the three common types of bag sealing and their respective application characteristics.

1. Three-side sealing bag

Snack foods, rice, tea, facial masks, etc. that we commonly see in supermarkets are usually packaged in three-side sealing bags. In terms of bag type, three-side sealing bags are the simplest and most common. Its style is sealed on three sides and open on one side, leaving only one opening for users to install products. Its advantages are: good air tightness, excellent moisturizing and sealing properties; high barrier level and extremely low oxygen and moisture permeability; strong ability to prevent moisture and mildew; bright and beautiful appearance, non-toxic and tasteless; after being bagged It can be unfolded into a three-dimensional bag shape first, with high space utilization;

In addition to the points mentioned above, three-side sealing bags are highly scalable and can be customized according to needs. Re-sealable zippers, easy-open tear openings and hanging holes for shelf display can all be implemented on three-side sealing bags.

2. Back seal bag

Back-sealed bags are also called pillow-shaped bags and center-sealed bags. The bag is composed of three seams at the top, bottom and back to form a pillow shape. The back-sealed bag adopts hidden vertical edge sealing to ensure the integrity of the front pattern of the package to the greatest extent. During the packaging design process, setting the bag pattern as a whole can keep the picture coherent, exquisite and beautiful, and with distinctive appearance characteristics. The seal of the back-sealed bag is on the back, so the pressure-bearing capacity of both sides of the bag is stronger, and the possibility of packaging damage is greatly reduced. For packaging bags of the same size, the total length of the seal will be the smallest with back sealing, which will also reduce the probability of seal cracking to a certain extent. Finally, back-seal bags can effectively reduce the cost of packaging materials and use less consumables. They can reduce the amount of packaging materials by about 40% without affecting production speed, and have obvious cost advantages.

Its inherent advantages of being moisture-proof, waterproof, insect-proof, and preventing items from scattering make back-seal bags widely used. They are mainly used for product packaging and storage of medicines, cosmetics, food, frozen foods, etc.

3. Four-side seal bag

The four-side sealing bag is a bag that is packaged in a heat-sealing bag on all four sides. Usually a whole piece of packaging film is divided into two halves and packaged opposite each other. The method of overall heat sealing and then single bag cutting is used. One side is controlled during production. Alignment can achieve good packaging results. Therefore, both packaging materials and production equipment have high adaptability and stability. The products packaged in four-side sealing bags form a cube, which has good packaging effect, can be used for food preservation and is suitable for multiple recycling; using a new printing process, the packaging patterns and trademarks can be more prominent, and the visual effect is outstanding. Four-side sealing bags are resistant to cooking, moisture-proof, and have good vacuuming effects. In addition to these characteristics that other packaging bags may also have, its strong antioxidant properties, anti-static and other characteristics can better protect products from damage due to external environmental factors, and are highly efficient. Extended shelf life.

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