In the field of aluminum alloy casting, fiberglass filter bags are key equipment for ensuring product quality, and their manufacturing process involves a great many specialized techniques.
1. Base Material Preparation
Select alkali-free fiberglass with high-temperature resistance and corrosion resistance as raw materials. Through weaving processes, produce basic filter media such as Fiberglass mesh and fabrics. Some products undergo needle-punching to form three-dimensional structured filter felts, precisely controlling porosity to balance filtration accuracy and low resistance for high temperature filtration applications.
2. Pre-treatment Enhancement
Apply heat setting to stabilize dimensions and structure. Adopt proprietary coating technologies (e.g., PTFE impregnation/lamination, special high-temperature composite coatings) to improve dew resistance, anti-adhesion properties, and chemical stability, ensuring performance in aluminum alloy casting environments with molten aluminum temperatures exceeding 900°C.
3. Bag Formation
Cutting & Sewing: Tailor filter media to specifications of casting equipment. Use high-temperature-resistant threads like Teflon, controlling stitch density and seam width to ensure durability in fiberglass bag filter production.
Structural Reinforcement: Embed spring steel rings or steel coils at the bag mouth, reinforced via folding and overlapping seams. Double-layer fiberglass composites are used at the bag bottom, with the outer layer wrapping the inner layer and stitching to the bag body. Additional reinforcement layers and inward folding are applied to critical joints (e.g., bag bottom-body connections), secured with multiple rows of stitching. Some specifications require baking processes to ensure long-term structural stability in fiberglass filter bags.
4. Performance Verification
Finished products undergo physical and chemical tests including air permeability, tensile strength (warp/weft), and composite strength. These validate compliance with requirements for high-temperature resistance, tear resistance, and precise filtration of impurities like oxides in molten aluminum, ensuring defect reduction and yield improvement in aluminum alloy casting operations.
This process integrates advanced fiberglass technologies to deliver filter solutions optimized for the rigorous demands of aluminum casting, ensuring reliable performance and enhanced productivity in high-temperature industrial environments.
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