The pouch is on the rise and has become very important as a packaging for many products. And there are many good reasons why the pouch is now so popular with producers, bottlers, retailers and consumers. The comparatively large area leaves a lot of space for marketing statements, product information and photos. Compared to bottles, cans or glasses, there are very few round or curved sections, which greatly enhances the visual significance. Another outstanding advantage is that the bag's weight is unbeatably low compared to all other forms of packaging. This has only positive effects on the carbon footprint in all phases of a bag's life. It starts with the transport from the bag producer to the bottler. Since an empty bag is not only lighter than a comparable bottle, but also significantly smaller, a truck can transport a much larger number. The space available in the truck is used sensibly. When transporting empty bottles, however, a lot of air is transported. It continues with the bottling. Due to the small space requirement and the low weight of the bags, the internal transport is also significantly easier and the storage space required until the actual filling is much smaller compared to the bottle. Due to the lower overall weight, further transports to interim storage facilities and trade are significantly more effective than products that were packed with glass or plastic bottles.
In the conventional method of fixing the so-called weld-in part in the bag, the upper outer area of the bag is often deformed. The reason for this are the welding ribs of the weldspout, which press through the high pressure in the heated PET and leave their mark. As a so-called laminate is necessary for the production of the bag film, recycling of the bag is only possible with increased effort. If the bag were made of a mono-material and were it still identical to the plastic used for the weldspout part, simple and conventional recycling would be possible without any problems.
So how can you use a bag with the right weldspout, which is made entirely of PE, is therefore recyclable, does not warp at the same time and still remains attractive and tight? The heat is no longer applied to the entire outer shell of the bag, to the inner layer and to the weldspout, but exactly the other way round. The weldspout is again heated so strongly via two welding jaws that the temperature is sufficient to melt the inside of the bag as soon as the two materials are pressed together. When the weldspout is heated, no contact is made between the welding jaws and the weldspout, but they separate only a few hundredths of a millimeter. This prevents material residues from sticking to the device. As soon as the weldspout with the melted surface is immersed in the bag and pressed against the inner film, a permanent connection is created. The big advantage is that the contact with the cold bag means that the heat is not sufficient to reach the outer surface. The outside of the bag thus remains smooth and intact. This technology means that PE can also be used for the outer layer of the bag. The entire bag is therefore made of a single PE material. The positive result is that the packaging can be easily recycled after use. Another sustainable solution from MENSHEN that helps to protect important resources and our environment.