The production process of medium and alkali-free bulked filtration materials is relatively complex, encompassing multiple steps such as raw material preparation, special processing techniques, and subsequent treatments. Below is a detailed overview of this production process:
I. Raw Material Preparation
Selection of Alkali-Free Glass Fibers: As the primary raw material for medium and alkali-free bulked filtration materials, alkali-free glass fibers possess excellent characteristics including high temperature resistance, corrosion resistance, anti-aging properties, high strength, and good insulation. These qualities make alkali-free glass fibers an ideal choice for filter material production.
Selection of Wetting Agents and Adhesives: To enhance the alkali-free glass fibers' folding endurance, wettability, and bonding strength with other materials, specific wetting agents and adhesives are applied. These may include imported water-soluble epoxies, imported coupling agents, PTFE emulsions, silicone oils, and other components.
II. Special Processing Techniques
Bulking Treatment: German-imported bulking equipment is used to process the alkali-free glass fibers into bulked yarn. Bulked yarn boasts greater bulkiness and filtration efficiency, enabling it to better capture and retain airborne particles.
Weaving and Needling: The bulked yarn is intertwined with other materials such as stainless steel conductive yarn to form a plain felt. Subsequently, the felt undergoes needling treatment using a needling machine to enhance its strength and wear resistance. During needling, fibers form a tightly intertwined structure, thereby improving the overall performance of the filter material.
Membrane Coating: To enhance the filter material's corrosion resistance, high-temperature resistance, surface smoothness, and breathability, a layer of multi-microporous polytetrafluoroethylene (PTFE) membrane is typically applied to the needled felt's surface. This membrane protects the filter material from chemical侵蚀 and extends its service life.
III. Subsequent Treatments
Sizing and Drying: The membrane-coated filter material undergoes sizing treatment to ensure dimensional stability. It is then dried to remove moisture and solvent residues, preparing it for subsequent cutting and sewing.
Cutting and Sewing: Based on actual requirements, the sized and dried filter material is cut into appropriate sizes and shapes. It is then processed into finished filter bags or cloths through sewing techniques.
Quality Inspection: Rigorous quality inspections are conducted on the finished filter materials, including visual inspections, dimensional measurements, strength tests, corrosion resistance tests, etc., to ensure compliance with relevant standards and requirements.
In summary, the production process of medium and alkali-free bulked filtration materials involves multiple stages and intricate technical treatments. Through scientific raw material selection, specialized processing techniques, and rigorous quality control, high-performance and long-lasting filter materials can be produced for extensive applications in industrial dust removal and air purification fields.
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