According to the search results, although there is no direct mention of a specific seminar held by Shanghai Zhengyi Company, some key points can be summarized from the relevant technical discussions, which may be discussed in similar technical seminars.
Key discussion points of ring die porosity
1. Definition and calculation of ring die porosity
• Definition: Ring die porosity refers to the ratio of the total area of all holes on the ring die working area to the total area of the ring die working area.
• Calculation formula:
Wherein,
• \(\psi\) is the porosity,
• \(n\) is the number of holes,
• \(d\) is the diameter of the pelletizing hole,
• \(D\) is the inner diameter of the working surface,
• \(L_1\) is the effective width of the working surface.
2. The influence of ring die opening rate on pellet mill performance
• Impact on production capacity: When the aperture and compression ratio are determined, appropriately increasing the ring die opening rate can increase the production capacity of the pellet mill. However, if the opening rate is too high, it may cause the depth of the bell mouth to become smaller, which will reduce the production capacity.
• Particle length: The larger the ring die opening rate, the shorter the pellets produced, and vice versa. This is because the larger the opening rate, the more material passes through the ring die per unit time, and the shorter the pellet length.
• Ring die strength: The opening rate is inversely proportional to the ring die strength. The higher the opening rate, the lower the strength of the ring die, so it is necessary to find a balance between production capacity and the service life of the ring die.
3. Optimization suggestions for ring die opening rate
• Relationship between aperture and opening rate: Generally speaking, the smaller the aperture, the lower the opening rate; the larger the aperture, the higher the opening rate. For example, for a hole with a diameter of 1.8mm, the opening rate is about 25%; for a hole with a diameter of 5mm, the opening rate is about 38%.
• Experiment and adjustment: The manufacturer can determine the size of the ring die opening rate through the successive approximation test method according to the selected ring die material, ring die shape structure and size to ensure that the ring die has sufficient strength.
• Practical application: In actual production, especially when producing small-diameter pellets, users may complain that the pellets are too long. This is because the corresponding ring die opening rate is low when the aperture is small. The solution includes appropriately reducing the output or increasing the ring die line speed.
4. Industry standards and practices
• Standard opening rate range: For ring dies with a die hole diameter of 2 to 12 mm, the die hole opening rate should generally be selected between 20% and 30%.
• Processing quality: The processing quality of the ring die will also affect the actual effect of the opening rate. For example, the diameter deviation, spacing deviation, blind hole rate, etc. of the pelletizing hole need to be strictly controlled.
Possible seminar content
If Shanghai Zhengyi holds a seminar on the ring die opening rate, the following content may be involved:
• Technical sharing: Introduce the calculation method of the ring die opening rate, influencing factors and their specific impact on the performance of the pelletizer.
• Case analysis: Share the application effects of ring dies with different apertures and porosity in actual production, and how to optimize them according to customer needs.
• User feedback: Invite customers to share their experience in using ring dies with different porosity, and discuss the problems encountered and solutions.
• Technology outlook: Explore the future development direction of ring die technology, such as how to further optimize the porosity and ring die performance through new materials or new processes.
Summary
The porosity of the ring die is one of the key parameters of the pellet mill performance, and its design needs to comprehensively consider the production capacity, pellet quality, ring die strength and service life. By reasonably adjusting the porosity, the production efficiency and product quality of the pellet mill can be optimized. As a professional ring die manufacturer, Shanghai Zhengyi may share its technical experience and innovative achievements in the porosity of ring die at similar technical seminars.