1. Sealing adaptation
The internal valve port of paper packaging needs to fit tightly with the sealing part of the paper packaging. For paper packaging, whether it is a paper box or a paper bag, sealing is the key to ensure that the contents are not affected by the external environment. The paper around the internal valve port is usually specially treated, such as being connected to the internal valve port by pressing or gluing. In the sealing design, the edge shape and size of the internal valve port must match the sealing structure of the packaging. For example, if the paper packaging is sealed with hot melt adhesive, the material of the internal valve port cannot react chemically with the hot melt adhesive, and the edge of the internal valve port must be able to fit well with the adhesive layer to prevent gaps. Such adaptation ensures the overall sealing of the packaging, whether it is to prevent the entry of external air and moisture, or to avoid leakage of contents, it can play a good role in protection.
2. Material adaptation
The materials of paper packaging are diverse, including ordinary cardboard, corrugated paper, etc. The adaptation of the internal valve port needs to consider the characteristics of the paper. If corrugated paper with a relatively hard texture is used for packaging, the installation part of the Internal valve port should be designed to withstand the hardness of the corrugated paper and will not be damaged during installation or use. For thinner ordinary cardboard packaging, the material of the Internal valve port should be relatively soft to avoid puncturing the paper when the packaging is slightly squeezed. In addition, the air permeability and water absorption of the paper will also affect the design of the Internal valve port. For example, for paper with strong water absorption, the Internal valve port may need to have better waterproof and moisture-proof properties to prevent moisture from passing through the paper and affecting the function of the Internal valve port.
3. Structural adaptation
From a structural point of view, the overall shape and internal space layout of the paper packaging will affect the adaptation of the Internal valve port. If it is a rectangular box packaging, the position of the Internal valve port should be determined according to the characteristics of the contents and the way the packaging is used. For example, for some powdered product packaging that needs to be convenient to pour out the contents when using, the Internal valve port may be set at the bottom or side of the box, and it must be coordinated with the folding structure of the box and cannot hinder the normal folding and forming of the box. At the same time, the size and shape of the Internal valve port should also be adapted to the space inside the paper box. It should not be too large to affect the overall strength of the packaging, nor too small to affect the normal flow of the contents or gas exchange.
4. Production process adaptation
In the production process of paper packaging, the adaptation of the Internal valve port is also reflected in the coordination with the production process. Paper packaging may go through multiple processes such as printing, cutting, folding, and binding. The installation of the Internal valve port should be able to be integrated into these process flows. For example, in the printing process, the presence of the Internal valve port cannot affect the printing effect of patterns and texts; in the cutting and folding processes, the position of the Internal valve port should avoid the key cutting lines and folding parts to avoid damage. At the same time, the installation process of the Internal valve port should also match the overall production efficiency of the paper packaging. If it is mass production, the installation of the Internal valve port should be simple and fast, and will not become a bottleneck link on the production line.
