In the high-pressure lamination process of multilayer PCBs and FPCs, resin bleed is an inevitable byproduct. If not controlled, this resin can adhere to press plates and molds, causing downtime and increasing rework costs. PTFE Coated Fiberglass Tapes and Release Fabrics are indispensable consumables that ensure a smooth “Zero-Stick” separation.
Physical & Thermodynamic Principles: Low Surface Energy and Tensile Strength
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Thermodynamic Release Mechanism: The tight Carbon-Fluorine (C-F) bonds in PTFE result in extremely low solid surface energy (γ_s ≈ 18 mN/m). According to the Work of Adhesion formula: Wa = γ_s + γ_l – γ_sl Since γ_s is exceptionally low, the work of adhesion Wa is minimized. Even under 200°C+, melted epoxy resin cannot wet the fabric, allowing for clean, residue-free peeling.
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Dimensional Stability: Pure PTFE is prone to cold flow. Lixing coats PTFE uniformly on a high-strength fiberglass mesh to achieve superior tear strength. The formula is: Ts = F / d With Ts > 40 kN/m, the reinforced tape prevents deformation and tearing under extreme lamination pressure during automated operations.
Industrial Applications: Vacuum Lamination & Equipment Protection
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FPC Vacuum Lamination: Acts as a pure release and protective layer, preventing resin contamination and protecting the press head while maintaining flatness.
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Molding Protection: Provides long-term anti-adhesion in continuous high-temperature operations, reducing maintenance downtime.
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