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Detailed Explanation of Measures to Reduce Ink Fuzzing

Release time:

2024-06-21 16:18

Detailed Explanation of Measures to Reduce Ink Fuzzing
Detailed Explanation of Measures to Reduce Ink Fuzzing

I. Why does flying ink occur?

Ink exhibits two key properties: viscosity and elasticity. When ink is subjected to a force for an extremely brief period—approaching an impact-like condition—ink behaves primarily as an elastic material. As a result, the resulting ink filaments tend to retract easily and are less likely to adhere firmly to the substrate. On the other hand, when ink is drawn into filaments, its viscosity becomes dominant, making it difficult for the ink to quickly retract. This can lead to the formation of suspended fine particles that fly into the air, causing "flying ink." At the moment when ink splits between the rollers, if the pressure distribution is uneven, voids will form within the ink film at the areas of lowest pressure. These voids then evolve into bubble nuclei, which gradually grow and eventually give rise to ink filaments, further exacerbating the phenomenon of flying ink. The poorer the wetting ability of the ink vehicle toward the pigment, the more readily bubble nuclei will form, and the more severe the flying ink problem will become.

II. How to Respond

1. Adjust the ink formulation

(1) Increasing the elasticity of ink: Adding substances such as silicone resin, long-chain non-aromatic amines, and stearic acid to the ink can enhance its elasticity, thereby reducing the likelihood of ink filaments breaking between rotating ink rollers.

(2) Enhancing the conductivity of ink: Adding water or ammonium-based electrolytes to the ink can increase its conductivity, preventing charges from easily accumulating on the ink’s surface and reducing the amount of ink mist. However, it’s important to note that the amount of water added should generally not exceed 5%; otherwise, the ink may become overly emulsified, making it unsuitable for high-speed printing.

(3) Enhancing the wettability of pigments and binders: Adding plasticizers to ink can improve the wettability of both pigments and binders, keeping pigment particles suspended in the ink without settling. This, in turn, inhibits the formation of ink bubbles and thus helps reduce ink misting.

(4) Improving the water resistance of ink: Selecting inks with good water resistance or adjusting the amount of water-resistant additives in the ink formulation can enhance the ink’s water resistance, thereby helping to reduce ink misting caused by ink emulsification or poor drying.

(5) Optimize the ink manufacturing process: Increase the grinding time for pigments, reduce the particle size of pigment particles, ensure thorough mixing of pigments and binders, and enhance dispersion. This helps improve the printability of the ink and reduce ink misting.

2. Improve equipment

(1) Improve the ink supply system of the printing press: Replace the long-ink-path supply system with a short-ink-path system. The long-ink-path supply system typically includes multiple complex components, which increase the risk of ink splashing during the transfer process. By reducing the length of the ink path in the short-ink-path supply system, the risk of ink splashing is significantly lowered.

(2) Increase the diameter of the ink rollers: A larger diameter of the ink rollers means that the ink is distributed more evenly on the rollers and exhibits greater mechanical stability during rotation. This helps reduce ink buildup on the rollers, thereby minimizing the occurrence of ink splashing.

(3) An excessively high printing speed is a major factor that exacerbates the phenomenon of ink splashing. Provided that print quality is maintained, appropriately reducing the printing speed can help minimize ink splashing during the transfer process. Based on the characteristics of the printing material, the performance of the ink, and the actual conditions of the printing machine, it is essential to set and adjust the printing speed reasonably to reduce the occurrence of ink splashing.

(4) Adjust printing pressure: Proper printing pressure ensures uniform ink transfer and reduces ink splashing caused by uneven ink distribution. Adjust the printing pressure to the optimal level based on the properties of the printing material and the ink.

(5) Regular cleaning and maintenance of the printing press are crucial measures for ensuring print quality and reducing ink splashing. When components such as ink rollers, printing plates, and rubber blankets are kept clean and in good condition, they can transfer ink more efficiently and maintain the cleanliness of the printing press. In particular, keeping the rubber rollers clean can significantly reduce ink splashing and waste.

(6) Install protective devices: Install protective devices around the ink rollers of the printing press to prevent the spread of flying ink, ensuring a clean printing environment and achieving a certain degree of effectiveness in reducing the occurrence of flying ink.

3. Improve the environment

(1) Control the temperature and humidity in the workshop: The phenomenon of ink mist is more severe in dry environments, as dry air tends to accumulate static electricity, which in turn attracts ink particles and causes ink mist. Moreover, both excessively high or low temperatures can affect the performance of the ink, thereby exacerbating the ink-mist phenomenon. By keeping the workshop’s temperature and humidity within a certain range, the generation of static electricity can be significantly reduced, thus minimizing the occurrence of ink mist.

(2) Install an air filtration system: The air in the printing workshop is often filled with fine particles of ink. If these particles are not promptly removed, they can lead to ink misting. By installing an air filtration system, we can use an air circulation system to capture and filter the air containing ink droplets within the workshop, then introduce fresh air to replace it. This approach effectively reduces the concentration of ink particles in the air, thereby minimizing the occurrence of ink misting.

(3) Static electricity is one of the key factors contributing to ink splashing. During the printing process, friction and contact between materials such as ink and paper easily generate static electricity. Equipment such as static eliminators can be installed at locations including the printer’s ink rollers and paper feed mechanisms to neutralize static charges and thereby reduce ink splashing.

By comprehensively applying the measures outlined above, it is possible to effectively reduce the occurrence of ink mist. These measures are applicable not only to traditional printing equipment but also to various types of printing devices, including digital printing equipment. In practical applications, it is essential to select appropriate measures based on specific circumstances and to combine them reasonably in order to achieve the best results in minimizing ink mist.

Disclaimer: The above content is sourced from the internet and is for reference only. If any infringement occurs, please contact us, and we will remove it promptly. 

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