Meaning
Surface replication relies on replicating sub-micron structures through polymer sourcing and moulding, where the tooling cavity holds nanometer-scale features that transfer fidelity into thermoplastic resin. Melt temperature and injection velocity dictate cavity pressure during packing, which directly controls transcription percentage across the optical active area. Viscosity instability introduces short shots inside sub-micron channels whenever thermal gradients fluctuate.
Resonating Tooling
Cavity machining requires single-point diamond turning or electron beam lithography on nickel substrates, yielding surface roughness values below five nanometers. Mold inserts transfer optical gratings and microfluidic channels into cyclic olefin copolymers during high-pressure clamping. Thermal expansion mismatch between steel mold bases and nickel shims induces residual stress across the parting line.
Moulding Parameter
Clamping tonnage must compensate for rapid cooling rates inside sub-micron cavities, because premature freezing locks internal stress into the amorphous structure. Regrind material introduces molecular weight distribution shifts that alter melt flow indices, resulting in incomplete feature filling and optical scatter. Datasheet values assume standard tensile bars rather than thin-walled micro-features, forcing processors to determine practical holding pressures empirically.
Specification Boundary
Part specifications govern dimensional tolerance and wavefront error across the replicated array, whereas material specifications dictate glass transition temperature and optical transmission. Scrap rates escalate sharply when barrel residence times degrade polymer chains, leading to chain scission and localised void formation. Dimensional drift during thermal cycling degrades diffraction efficiency long before structural failure occurs.
