Ever wonder what goes into the sheets that cradle your morning pour‑over? Crafting high‑performance coffee filter paper requires precision at every stage—from fiber selection to final packaging. At Tonchant, we combine traditional papermaking techniques with modern quality controls to deliver filters that yield a clean, consistent cup every time.

Raw Fiber Selection
Everything starts with the fibers. Tonchant sources FSC‑certified wood pulp alongside specialty fibers like bamboo pulp or banana‑hemp blends. Each supplier must meet strict food‑safety and sustainability standards before their pulp arrives at our Shanghai mill. Incoming bales are tested for moisture, pH balance, and fiber length to ensure they’ll form the ideal mesh for trapping grounds without blocking essential oils.

Refining and Sheet Formation
Once the pulp passes inspection, it’s mixed with water and refined in a controlled‑energy pulper. This process gently breaks down fibers to the right consistency. The slurry then moves to a continuous‑belt Fourdrinier machine, where water drains away through a fine mesh, forming a wet sheet. Steam‑heated rollers press and dry the paper to the exact thickness and density required for V60 cones, basket filters, or drip‑bag sachets.

Calendering and Surface Treatment
To achieve uniform flow rates, the dried paper passes between heated calender rollers. This calendering step smooths the surface, controls pore size, and locks in the paper’s basis weight. For bleached filters, an oxygen‑based whitening process follows—no chlorine byproducts. Unbleached filters skip this stage, preserving their natural brown hue and minimizing chemical use.

Cutting, Folding, and Packaging
With a precise, micron‑level caliper achieved, the paper rolls head to automated die‑cutters. These machines stamp out cone shapes, flat‑bottom circles, or rectangular sachets with micron‑accuracy. Folding stations then create the crisp pleats needed for even extraction. Each filter is washed in purified water to remove any residual fibers and then air‑dried. Finally, filters are counted into branded sleeves or compostable pouches, sealed, and boxed for roasters and cafés worldwide.

Rigorous Quality Testing
Tonchant’s in‑house lab performs end‑to‑end checks on every lot. Air‑permeability tests confirm consistent flow rates, while tensile‑strength assays ensure filters won’t tear during brewing. Real‑world brew trials compare extraction times and clarity against benchmark standards. Only after meeting all criteria does a batch earn the Tonchant name.

Why It Matters
A great cup of coffee can only be as good as its filter. By mastering each production step—from fiber selection through lab testing—Tonchant delivers filter paper that highlights your beans’ finest notes without off‑flavors or sediment. Whether you’re a specialty roaster or a café owner, our filters let you brew with confidence, knowing the paper behind your pour‑over is engineered for excellence.