French Press — Plunger Mechanism

The defining component of the French press is its plunger assembly: a metal rod topped by a handle and fitted at its base with a circular stainless steel mesh disc (typically 60–100 micron openings) pressed between two metal plates. When pushed to the bottom of the vessel after steeping, the mesh acts as a physical barrier between the brewed liquid above and the spent grounds below. The coarseness of the mesh directly determines how much fine sediment passes into the cup — finer mesh reduces sludge but can clog with very fine grinds. A popular specialty technique places a paper filter (Aeropress-style or folded circular filter) on top of the mesh disc before plunging, producing a cleaner, more transparent cup by adsorbing oils and trapping micro-fines — effectively converting the French press into a hybrid immersion-filter brewer.