[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_28":-5,"_38":-5,"_39":40,"_41":42,"_43":44,"_45":46,"_47":48,"_49":50,"_51":52,"_53":54,"_55":56,"_57":58},"routes/_store+/_readers+/email_author.$slug/route",{"_9":10,"_11":-5},"book",{"_12":13,"_14":15,"_16":17,"_18":19,"_20":21,"_22":23},"currentUser","id","Z2lkOi8vbGVhbnB1Yi9TdG9yZTo6Qm9va1Byb2R1Y3QvODAzNjc","title","Build Any Mill in Python: A Modular Simulation Platform for Pulp & Paper","state","published","contactAuthorMethod","email","aboutText","

Every pulp & paper feasibility study starts the same way: a blank

spreadsheet, hardcoded mass balances, and weeks of debugging.

Modular Mill is a Python platform that changes this. Assemble any

mill configuration from LEGO-like process modules — OCC, Kraft,

Board Machine, Tissue Machine — connect them, call mill.run(),

and get automatic mass, energy, and water balance instantly.

What's inside:

- 8 production-grade modules validated against industry design data

- Physics-based dryer models (TAPPI DR curves, Yankee evaporation)

- Recovery boiler, turbine, and power strategy simulation

- Operating cost layer with sensitivity analysis

- Interactive Streamlit dashboard

- 2,414 automated tests — all passing

No NumPy, no SciPy. Standard library only in the calculation engine.

This is a living book. All future updates — new modules, deeper

physics models, additional mill examples — are delivered free to

all buyers automatically via Leanpub.

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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