The four-sided sealed bags have undergone heat-sealed packaging forms. At present, the common granular packaging forms are mature in technology and simple in technology. The equipment has high operation stability, beautiful appearance and good sealing performance, so let's understand the difference between the four-sided sealed bag, the three-sided sealed bag and the back sealed bag!

The four-sided sealing bag is generally divided into two halves of opposite packaging using the whole film, which belongs to the way of cutting a single bag after the whole hot bar bag, and only one side of the control can be aligned during production to achieve a good packaging effect. It is therefore important that the package/equipment adaptability and the package handling stability are very high. Because four-sided envelopes are generally slower than packaging machines, the general pattern is to put together multiple four-sided bags and a packaging machine. At the same time, since each edge passes through a uniform hot rod, the product after being bagged has better sealing performance.

The disadvantage of the four-sided bag is that the packaging adaptability to the volume is insufficient. The whole film is made of pockets first and then cut, so the composite film is relatively flat when making the bag, the pocket after the bag is flat, the volume is difficult to load, and the space utilization rate in the four-sided bag is relatively low.

One side of the three-sided bag is directly folded into a composite film, and the remaining three sides are in the form of heat-sealed edges. In fact, the three-sided bag can be seen as a supplement to the four-sided bag. Compared with the four-sided seal bag, its advantage is that after becoming a pocket, it can be developed into a three-dimensional bag type first. High space utilization, suitable for large-scale packaging needs, commonly used in cold granules and other products packaging.

The shortcomings of the three-sided bag are also obvious. First of all, the three-sided bag caused by the bag type asymmetry effect is beautiful. Of course, people have different opinions on aesthetic issues. Not much discussion here. Second, the packaging speed is slow. The common packaging form of three-sided sealed bags is single-row packaging (this is why three-sided sealed bags are suitable for bulk packaging. Because only heat insulation can not consider the requirements of composite membrane smoothness.

The roll film is first divided into heat, and each composite film is longitudinally sealed toward one side, and then the package is laterally sealed. The advantages of Bai Fengbai are obvious. First of all, the appearance is very beautiful. The hidden back seal bag and bag-like features used in the back seal bag obviously determine the appearance characteristics, and the bag-like exquisite tube has obvious difference advantages compared with the same type of four-sided bag products. Second, the back-sealed bag combines several columns of four-sided sealed bags, combining the advantages of packaging speed and high space utilization of three-sided sealed bags. Relatively speaking, the four-sided bag can reduce the use of packaging materials by about 40% without affecting the production speed, and the packaging cost advantage is very obvious.

The shortcomings of the back seal bag are also obvious. First of all, according to the way the composite film is split first and then each column is made of bags, the back-sealed bag has poor adaptability to packaging materials/packaging equipment, while the bag type of the back-sealed bag is difficult to handle in the follow-up, so the initial equipment investment of the back-sealed bag is large and the operation and maintenance cost is high. Second, the transverse sealing position of the back seal bag is that the bell seal edge is sealed together with the composite film, so it is difficult to heat seal, the bag seal seal is lower than that of the four bread, and the risk of bag seal failure is also significantly higher than that of the four bread. In short, the four-side seal bag, the three-side seal bag, and the back seal bag have obvious characteristics and a unique scope of application. Some characteristics are the advantages of the packaging form and the source of defects. How to choose the appropriate packaging form, according to the enterprise's products and packaging form to decide. For example, for high-capacity products, the form of four-sided bags is difficult to bear, and three-sided bags and back-sealed bags can better solve this problem.

The above introduction is the difference between four-sided sealing bag, three-sided sealing bag and back sealing bag. If you need to know more, please feel free to contact us!