1. Key points of anti-blocking structure design
The anti-blocking function design of paper packaging external valve port should first consider the internal channel structure of the valve port. The gradual expansion inlet design can make the material entering the valve port flow more smoothly, reducing the possibility of material accumulation and blockage at the inlet due to sudden diameter change. A guide blade or spiral groove is set inside the valve port. When the material passes through, it can form an orderly flow state with the help of the guiding effect of the blade or spiral groove, avoiding the material from entangled or agglomerated and blocking the channel. For example, for some packaging valve ports of powdery materials, the spiral groove can cause the powder to rotate and slide down along the channel to prevent it from bridging and blocking in the valve port. In addition, a detachable filter screen is set at the outlet of the valve port, which can not only prevent large particles of impurities from entering the valve port and causing blockage, but also facilitate cleaning or replacement when necessary, ensuring the long-term unobstructedness of the valve port.
2. The influence of material selection on anti-blocking
The selection of materials is also crucial to the anti-blocking performance of paper packaging external valve port. The inner wall of the valve port should be made of materials with smooth surface and low friction coefficient, such as specially treated plastic or ceramic coating materials. In this way, during the material flow process, the adhesion between the material and the inner wall of the valve port can be reduced, and the risk of material residue and blockage can be reduced. For some materials that are easy to absorb moisture and agglomerate, the valve port material should also have a certain moisture-proof performance. Moisture-proof paper or composite materials can be used to make valve port parts to prevent the material from sticking to the valve port due to moisture. For example, in food packaging, if the packaging is sugar powder that is easy to absorb moisture, the valve port is made of plastic material with a moisture-proof coating, which can effectively prevent the sugar powder from absorbing moisture in the air and blocking the valve port, ensuring the smooth progress of the packaging process.
3. Verification method of anti-blocking function
To verify the anti-blocking function of the paper packaging external valve port, a simulation experiment method can be used. First, according to the design specifications and application scenarios of the valve port, prepare corresponding material samples, including materials of different particle sizes, shapes and properties. In a laboratory environment, build a test device similar to the actual packaging production line, install the valve port on the test device, and continuously deliver materials to the valve port according to the predetermined flow and pressure parameters. During the test, observe whether the valve port is blocked, and record data such as the flow state of the material, the amount of flow, and the pressure change in the valve port. For example, for liquid packaging valve ports, the effectiveness of the anti-blocking function can be judged by measuring whether the liquid outflow per unit time is stable and whether there are bubbles or impurities accumulated in the valve port; for solid material packaging valve ports, it can be checked whether the material flows out evenly and smoothly, whether there is material stuck in the valve port, etc.
4. Optimization and improvement measures
Based on the results of the anti-blocking function verification, the valve port design is optimized and improved. If a certain structure or material is found to have a risk of blockage under specific materials or working conditions, it can be adjusted in a targeted manner. For example, if it is found that the aperture of the filter screen is too small to cause material blockage, the aperture can be appropriately increased or a combination of multiple layers of screens with different apertures can be used. For the valve port blockage problem that occurs in the packaging of high-viscosity materials, it can be considered to add a heating device inside the valve port to keep the material flowing when passing through the valve port, thereby avoiding blockage. At the same time, the optimized valve port is verified and tested again, and this process is repeated until the anti-blocking function of the valve port can achieve satisfactory results in various expected application scenarios, ensuring the reliability and stability of the paper packaging external valve port in actual production and use.
