United States + Scraper Self-Cleaning Filter + Paints Filtration

January 16, 2026 United States

Product: Scraper Self-Cleaning Filter

Country: United States

Application: Paints Filtration

The scraper self-cleaning filter due to its unique mechanical scraping method, is ideally suited for processing high-viscosity, easily agglomerating media, making it an efficient and critical choice in the filtration process of the coatings industry.

The following is a detailed explanation of how the scraper self-cleaning filter is used for paint filtration:

I. Core Application Points: Addressing the Pain Points of Coatings Filtration

Coatings (including paints, inks, varnishes, etc.) typically contain high solid content, high viscosity, and are prone to skinning or forming gel particles. Traditional filter bags or cartridge filters are prone to:

Rapid clogging: leading to a sharp decrease in filtration flow, requiring frequent replacement of filter media, and resulting in long downtime.
Material waste: a large amount of expensive coating material adheres to the filter media, making recovery difficult and causing waste.
High labor costs: replacement and cleaning work is labor-intensive.

The scraper self-cleaning filter perfectly solves these problems through fully automatic mechanical scraping.

II. Working Process and Principle

The working process of the scraper self-cleaning filter for coatings filtration can be summarized in the following steps:

Normal filtration: The coating is pumped into the filter housing, passing from the inside out through a wedge wire screen (or perforated filter cartridge). The qualified, smooth coating passes through the filter screen to become the filtered liquid, while impurities (such as skinning, gels, and impurity particles) are retained on the inner surface of the filter screen.
Pressure difference increase/timed trigger: As impurities accumulate on the inner side of the filter screen, the filtration channel gradually narrows, and the pressure difference between the inlet and outlet increases. When the pressure difference reaches a preset value (e.g., 0.5-1 bar) or reaches a preset cleaning cycle, the control system automatically starts the cleaning program.
Automatic scraping and cleaning:
A precisely manufactured scraper component (usually made of plastic or stainless steel, with an edge shape that perfectly fits the inner wall of the filter screen) is driven by a motor to rotate or move axially along the inner wall of the filter screen.
The scraper, like a "planing tool," thoroughly scrapes away all sticky impurities adhering to the filter screen.
Impurity discharge:
During cleaning, the main drain valve automatically opens.
The scraped impurities are quickly discharged from the drain port with a small flow of coating liquid. The entire process only lasts for tens of seconds, and the system maintains continuous operation.
Filter Restoration: After cleaning, the drain valve closes, and the equipment immediately returns to the filtration mode at maximum flow rate.

III. Specific Application Stages in Coating Production

Self-cleaning scraper filters are typically installed at the following key positions:

Raw material filtration: Filtering raw materials such as resins, solvents, and pigments to ensure the purity of the input materials.
Finished product filtration: Performing final filtration before coating filling to remove impurities that may have been introduced during the production process, ensuring a flawless product. This is the most critical application stage.
Post-grinding filtration: Filtering the slurry after grinding and dispersion to capture incompletely dispersed pigment particles or grinding media.
Recycled coating filtration: Filtering recycled coatings generated from cleaning equipment or production lines to achieve waste reuse.

The self-cleaning scraper filter is an ideal filtration solution for achieving efficient, continuous, and automated production in the coatings industry. If you can provide specific coating types (such as water-based paint, oil-based paint, UV paint) and operating parameters (flow rate, pressure, etc.), JX FILTRATION can provide you with more accurate model recommendations and technical solutions.

After-Sale Services

Quality guarantee: 12 months after the equipment having been operated.
Satisfied after-sell service: free maintenance and inspection.
Detailed installation instructions, CAD drawing and product qualification certificate.