Overview
Thin strip coil with backing material combines precision metal strips (typically 0.05-0.5mm thick) with adhesive or polymer layers for industrial applications requiring both metallic properties and bonding functionality. These coils are produced through roll-to-roll processing with strict thickness tolerances (±0.005mm). Common widths range from 5mm to 600mm, supplied in coils weighing 50-500kg. The backing materials vary from pressure-sensitive adhesives to thermally conductive films, selected based on end-use requirements in electronics, automotive, and energy sectors.
Structure and Working Principle
The product features a three-layer construction: metal substrate (often stainless steel 304 or copper C11000), primer coating for adhesion, and functional backing material. The metal provides mechanical strength and conductivity, while the backing enables bonding to other surfaces without secondary processes. During application, coils are fed through automated unwinders where the backing's release liner is removed. The exposed adhesive bonds to target substrates under controlled pressure. Some variants use heat-activated adhesives requiring 120-180°C curing temperatures for permanent bonding.
Key Features
Dimensional stability is critical, with premium grades maintaining ±0.1mm width tolerance and ±1° flatness after unwinding. Electrical versions offer surface resistivity from 0.01-100 ohm/sq, while thermal grades conduct 1-5 W/mK. Specialized types include EMI shielding variants with nickel/copper composites (attenuating 60-100dB at 1GHz) and flexible circuit base materials with polyimide backing. All versions undergo strict quality checks for delamination resistance (typically >5N/25mm peel strength).
Application Areas
In consumer electronics, these coils create grounding paths in smartphones and tablets (0.1mm thick stainless steel with conductive adhesive). Automotive applications include battery cell interconnects in EVs, where copper strips with high-temperature acrylic backing withstand 150°C continuous operation. Industrial uses encompass flexible heating elements (etching nickel-chrome alloys onto polyimide) and RFID antenna substrates. Medical device manufacturers utilize thin titanium coils with biocompatible silicone backing for implantable components.
Maintenance and Precautions
Store coils in original packaging at 15-30°C with <60% RH to prevent adhesive degradation. Use tension-controlled unwinders (5-15N tension) to avoid stretching thin gauges. Clean application surfaces with IPA to maximize bond strength. For conductive applications, verify surface oxide removal through peel tests. Scheduled maintenance of slitting tools prevents burrs that could pierce backing materials during processing. Dispose of release liners as industrial waste per local regulations.
B2B Procurement Guide
Specify required parameters: metal type/thickness (metric or AWG), backing material (acrylic, silicone, etc.), roll dimensions (ID/OD/core type), and performance certifications (UL, RoHS). Request mill test reports for critical applications. Leading manufacturers include Nippon Steel (Japan), ArcelorMittal (Luxembourg), and local specialized converters. MOQs typically start at 500kg for standard grades, with 8-12 week lead times for custom formulations. Sample evaluation should include real-world bonding tests under expected environmental conditions.
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