Impact of raw materials
The moisture resistance of Kraft Carton depends first on its raw materials. High-quality kraft paper itself has certain natural moisture-proof properties, and its fiber structure is relatively tight, which can block the intrusion of moisture to a certain extent. In addition, the weight of the paper is also an important factor. Generally speaking, kraft paper with a higher weight is relatively thicker and has stronger moisture resistance, because thicker paper can provide more physical barriers and slow down the penetration of moisture. . Moreover, the moisture-proof performance of some kraft papers that have been specially treated or added with moisture-proof agents will be significantly improved. These additives can form a hydrophobic film on the surface of the paper fibers, making it difficult for moisture to adhere and penetrate.
Surface treatment process
The surface treatment process plays a key role in Kraft Carton’s moisture resistance. Common surface treatment methods include applying moisture-proof coatings, laminating, etc. Applying moisture-proof coating can form a continuous protective film on the surface of the carton. This film has good waterproof and barrier properties and can effectively prevent direct contact between moisture and the carton. The coating is to cover the surface of the carton with a layer of plastic film. The plastic film has excellent waterproof performance, which can greatly improve the moisture-proof ability of the carton, and can also increase the gloss and wear resistance of the carton. Different surface treatment processes have their own advantages and disadvantages in terms of moisture-proof effect, cost and environmental protection. Manufacturers will choose the appropriate process based on specific needs and product positioning.
Structural design of cartons
Reasonable structural design helps to improve the moisture resistance of Kraft Carton. For example, for cartons with a multi-layer structure, moisture-proof barriers can be installed between different layers, such as a layer of moisture-proof paper or plastic film sandwiched between corrugated paper, which can increase the path for moisture penetration and improve the moisture-proof effect. In addition, the way the carton is sealed is also important. Good sealing can reduce the possibility of moisture entering the carton through gaps. When using tape for sealing, ensure that the tape has good stickiness and sealing properties, or use tape with moisture-proof glue; for some large cartons, sealing strips can also be used to further enhance moisture-proof performance.
Storage and usage environment
The moisture resistance of Kraft Carton is also closely related to the storage and use environment. If the cartons have been in a humid environment for a long time, such as basements, warehouses with high humidity, etc., even if the cartons themselves have certain moisture-proof capabilities, it will be difficult to maintain good condition for a long time. Therefore, when storing, you should try to choose a dry and well-ventilated environment, and take appropriate moisture-proof measures, such as using dehumidification equipment and placing desiccants. During use, the carton should also be avoided from direct contact with the ground or water sources to prevent moisture from intruding into the carton from the bottom or sides. At the same time, for some products with high moisture-proof requirements, auxiliary moisture-proof measures such as moisture-proof bags or desiccants can be added to the cartons during packaging to ensure the safety of the products during transportation and storage.
