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Russian Application of Filter Press in Food Grade Dye Filtration
The application of filter press in food grade dye filtration is crucial, mainly reflected in its ability to efficiently separate solids and liquids, ensuring that the dyes are pure, safe, and meet the quality standards of the food industry. The following is the application of filter press in food grade dye filtration.
Reasons for Filtering Food-Grade Dyes
Food-grade dyes are usually derived from plant extracts, natural minerals, or safety-verified synthetic materials. During the production process, these dye stock solutions often contain plant fibers or residues, insoluble impurities, microorganisms, or sediments.
The filter press can effectively retain solid particles in the liquid on the filter cloth by applying pressure to form a filter cake, while the clarified dye liquid flows out through the filter cloth to complete the solid-liquid separation.
Filtration Process
Pretreatment of raw liquid
Before filter pressing, it is usually necessary to properly pretreat the raw dye liquid to ensure the filtration effect.
Remove large particles of impurities through coarse filtration or sieve, and add filter aids (such as diatomaceous earth, activated carbon, to enhance filtration efficiency).
Feeding and filtration
The dye stock solution is pumped into the filter chamber of the filter press through the feed pump. The liquid flows out through the filter cloth under pressure, and the solid impurities are trapped on the surface of the filter cloth, gradually forming a filter cake. The filtrate is discharged through the filter plate and collected in the storage tank through the pipeline.
Filter cake removal and cleaning
After stopping the feeding, the filter press automatically or manually loosens the filter plate. The filter cake is discharged by gravity or scraper and can be collected for recycling or waste treatment. After the cake is unloaded, the filter cloth and filter plate are cleaned to prepare for the next filtration.
Application Advantages
Food grade safety
The parts in contact with dyes are made of food-grade materials, which are corrosion-resistant and acid-resistant and meet GMP or HACCP standards. Non-toxic and tasteless filter cloth can be used to avoid secondary pollution.
High-efficiency filtration and clarification
High-pressure feeding increases filtration speed and high filtration accuracy. The filter cloth aperture and feed pressure can be adjusted according to the dye viscosity and particle diameter.
Easy to recover dyes
The dye concentration in the filter cake is high and can be recycled and reused. Reduce the waste of raw materials and improve economic benefits.
Maintenance Recommendations and Precautions
- Replace or clean the filter cloth regularly to avoid clogging and affecting the filtering effect.
- Clean before and after use to ensure the hygiene level.
- Check whether the compression system is operating normally to prevent leakage or incomplete filtration.
Conclusion
The filter press not only improves production efficiency and dye quality in food-grade dye filtration, but also ensures the food safety standards of the product. Whether it is small-scale manual extraction or industrial continuous production, a properly selected filter press is an indispensable core equipment in the dye manufacturing process.
