Pulp Mill EO/PO Defoamer Design

I need a complete glycol-based EO/PO defoamer formula that performs reliably in pulp and paper production. Our biggest pain point is keeping foam suppressed for many hours rather than simply knocking it down at the surface, so please optimise for long-lasting prevention throughout stock preparation, white water loops, and the paper machine wet end. Fast collapse is fine as a secondary benefit, but durability has to dominate the profile. The job covers more than sending a generic blend. I am looking for a lab-proven composition with: • a clear bill of materials (grade, supplier suggestions, and typical ranges) • step-by-step manufacturing procedure that can scale from 5 L pilot to plant-size batches • recommended dosage curves for softwood, hardwood, and recycled fibre furnishes • stability data (storage, freeze-thaw, pH, and shear) and any viscosity targets measured with a Brookfield viscometer • comparative foam curves run on industry-standard tests such as Ross-Miles or a DIN shake test, showing sustained suppression versus an untreated control for at least 30 minutes • an outline of potential defoamer-related sheet defects and how the proposed additive avoids them If you already have access to screening tools—high-speed blender, dynamic foam column, lab paper machine—let me know; otherwise I can arrange outside testing once the bench formula is set. Once the formulation, procedure, and data package are agreed, I will request a 1–2 L pilot sample for mill trials. Final acceptance will be based on consistent, long-lasting foam control in my white water (≤ 10 mm foam height after 20 minutes circulation) without causing spots or pitch deposition. Looking forward to seeing your chemistry expertise translate into a robust pulp-mill defoamer.