Classification and identification methods of mainstream plastic bags on the market

Various types of packaging bags emerge in endlessly on the market, which is dazzling. Among the various types of packaging bags, we can initially divide them into three-side sealing bags, four-side sealing bags, eight-side sealing bags, and center-sealing bags according to the structure of the bag. After adding different functional accessories to several basic bag types such as packaging bags and stand-up bags, bag types with outstanding functional characteristics such as zipper bags and spout bags have emerged.

1. Three-side sealing bag

Three-side sealing packaging bags are the most common type of packaging bags. The bags that customers get are sealed on three sides. The last side is sealed by the customer after loading. This kind of bag can have an easy-tear opening or a zipper self-sealing opening. , thereby meeting more personalized needs.

Three-side sealing packaging bags are commonly used in various condiment packaging bags, such as chicken essence, MSG, etc. Some snack products also choose three-side sealing packaging bags.

Compared with other bag types, the cost of three-side sealing packaging bags will be lower. For price-sensitive products, this type of packaging can be used to control production costs and increase product profits.

2. Four-side seal bag

Four-side sealing packaging bags are commonly seen in bread packaging bags. This kind of packaging bag has folds on the left and right sides. The space is larger than that of three-side sealing packaging bags. It can hold more products. The overall shape is also more three-dimensional and larger than three-side sealing packaging bags. The sealing is more advanced, and some nut products and cereal products will also use this kind of packaging bag.

3. Eight-side sealing bag

Eight-side sealing packaging bags are more three-dimensional than four-side sealing. In addition to folding on the left and right sides, the bottom is also folded. After being filled with products, the bottom can be flattened to achieve a self-standing effect and better display the product. This type of packaging bag is more common in nut snack products and is the best choice to improve product quality.

4. Stand up bag

It is also a packaging bag that can achieve a self-standing effect. Unlike the eight-sided sealing packaging bag, the self-standing packaging bag adds a separate oval bottom at the bottom. After being filled with product, the bottom is fully extended to achieve a self-standing effect. The display effect of this kind of stand-up bag is similar to that of eight-sided sealing, but the overall space is slightly insufficient and the three-dimensional effect is relatively weak. However, the cost is lower than that of eight-sided sealing. For those who need to improve product quality but want to control costs They are more suitable.

5. Center seal packaging bag

Center seal packaging bag is a bag type with obvious characteristics. In the middle of the back of the bag, there will be an obvious extra sealing edge, so it is also called back seal bag. The most common bags of this kind are candies, ice cream, dumplings, rice, etc. Packaging of flour and other products.

Like three-side sealing, center-sealing bags have the advantage of lower cost, but unlike three-side sealing, center-sealing bags have wider applicability and higher expandability than three-side sealing, which can control costs. On the premise of meeting some personalized packaging needs, such as increasing capacity by folding the left and right sides.

5.Zip bag/nozzle bag

Zipper bags and spout bags are personalized bag types that evolved from the basic bag type by adding zippers and suction nozzles. Currently, self-sealing zipper bags are very common and can be seen in various bag types, while spout bags , the more common ones are jelly packaging and ketchup packaging. Of course, there are also some bagged beers, which also use spout bags.

The above is a brief introduction to the bag type of packaging bags. I hope it can be helpful to everyone.

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