When food needs to be stored for a long time or items that are susceptible to moisture need to be protected, PE printed bags with excellent sealing performance become a reliable choice. The polyethylene material used in PE printed bags has good barrier properties and can effectively block the intrusion of external air, moisture and dust. The molecular structure of this material is tight, like a natural barrier, separating the internal and external environments of the bag, reducing the impact of external factors on the items in the bag from the source.
In terms of structural design, the common self-sealing strip design of PE printed bags can be called a "weapon" for freshness and moisture prevention. The self-sealing strip is composed of concave and convex plastic teeth and grooves. Just press gently to make the teeth and grooves bite tightly to form a tight sealing line of defense. When storing food, try to expel the air in the bag and press the self-sealing strip. The food will be isolated in a relatively closed space, "insulated" from the external humid air and bacteria, thereby extending the shelf life of the food and maintaining its fresh taste. Even fragile and moisture-prone foods such as biscuits and potato chips can remain crispy for a long time under the strict protection of the self-sealing strip.
For some items that require higher sealing, such as tea, coffee and other dry goods that are very easy to absorb moisture and odor, PE printed bags will also use heat sealing technology. The PE material at the bag mouth is melted by high temperature and then quickly cooled and bonded to form a seamless seal. This sealing method can withstand greater pressure and tension, almost completely blocking the circulation of air and moisture. Even in a humid environment, it can keep the tea dry and retain the mellow tea aroma; the coffee powder will not clump due to moisture and continue to emit a rich coffee aroma.
In addition to the sealing design, the overall thickness and uniformity of PE printed bags also have an important impact on the sealing performance. During the production process of high-quality PE printed bags, precise process control is used to ensure that the thickness of each part of the bag is consistent and there are no weak points. The uniform thickness not only enhances the strength of the bag, but also ensures the stability of the sealing. Whether it is the corners or the middle part of the bag, it can effectively prevent moisture penetration and provide all-round protection for the items in the bag.
In addition, the special coating treatment on the surface of PE printed bags further improves its moisture-proof performance. This coating is like an invisible protective film with extremely low moisture permeability, which can minimize the penetration of external moisture. When packaging foods with high water content, such as pickled meat and fresh fruits, the coating can prevent the evaporation of food moisture and prevent external moisture from entering, maintaining the freshness of the food and avoiding food deterioration or rot due to moisture imbalance.
In actual use scenarios, PE printed bags with excellent sealing performance show strong adaptability. On supermarket shelves, various packaged foods are sealed with PE printed bags. Even if consumers do not finish eating them at one time after purchase, they can easily seal them with self-sealing strips for convenient consumption next time; in industrial production, precision instruments, electronic components and other items are packaged in PE printed bags that have been heat-sealed to resist moisture and humidity during transportation and ensure the safe delivery of items.
It is precisely with high-quality materials, exquisite structural design, strict production process and practical additional treatment that PE printed bags with excellent sealing performance fully ensure the freshness of food and moisture-proofness of items, becoming a powerful assistant in the field of packaging to ensure the quality of items. Whether in daily life or industrial production, they play an irreplaceable and important role.
