{"id":31006,"date":"2026-06-27T10:56:44","date_gmt":"2026-06-27T02:56:44","guid":{"rendered":"https:\/\/shchimay.com\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/"},"modified":"2026-06-27T10:56:44","modified_gmt":"2026-06-27T02:56:44","slug":"pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights","status":"publish","type":"post","link":"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/","title":{"rendered":"Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights"},"content":{"rendered":"<hr \/>\n<p>title: &ldquo;Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights&rdquo;<br \/>\ndate: 2026-06-26<\/p>\n<hr \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_50 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Pitch_Deposition_Management_Through_pH_Control_in_Papermaking_Shanghai_ChiMay_Insights\" title=\"Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights\">Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights<\/a><ul class='ez-toc-list-level-2'><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Introduction\" title=\"Introduction\">Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Understanding_Pitch_A_Brief_Chemistry_Primer\" title=\"Understanding Pitch: A Brief Chemistry Primer\">Understanding Pitch: A Brief Chemistry Primer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#The_pH_Specification_Why_Precision_Matters\" title=\"The pH Specification: Why Precision Matters\">The pH Specification: Why Precision Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Measurement_Challenges_in_Papermaking_pH_Environments\" title=\"Measurement Challenges in Papermaking pH Environments\">Measurement Challenges in Papermaking pH Environments<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Closed-Loop_pH_Control_Architectures\" title=\"Closed-Loop pH Control Architectures\">Closed-Loop pH Control Architectures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Comparative_Analysis_Manual_vs_Closed-Loop_pH_Control\" title=\"Comparative Analysis: Manual vs. Closed-Loop pH Control\">Comparative Analysis: Manual vs. Closed-Loop pH Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Integration_with_the_Mill%E2%80%99s_Wet-End_Control_Architecture\" title=\"Integration with the Mill&rsquo;s Wet-End Control Architecture\">Integration with the Mill&rsquo;s Wet-End Control Architecture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Economic_Drivers_for_Tight_pH_Control\" title=\"Economic Drivers for Tight pH Control\">Economic Drivers for Tight pH Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Calibration_and_Validation_Discipline\" title=\"Calibration and Validation Discipline\">Calibration and Validation Discipline<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Looking_Forward_Predictive_Pitch_Management\" title=\"Looking Forward: Predictive Pitch Management\">Looking Forward: Predictive Pitch Management<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/shchimay.com\/hi\/pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 id=\"pitch-deposition-management-through-ph-control-in-papermaking-shanghai-chimay-insights\"><span class=\"ez-toc-section\" id=\"Pitch_Deposition_Management_Through_pH_Control_in_Papermaking_Shanghai_ChiMay_Insights\"><\/span>Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p><strong>Key Takeaways:<\/strong><br \/>\n&#8211; Pitch deposits cause an estimated <strong>$1.8 billion<\/strong> in annual production losses across the global pulp and paper industry<br \/>\n&#8211; pH variations of just <strong>\u00b10.3 units<\/strong> can shift wood extractive solubility enough to trigger pitch precipitation in white water systems<br \/>\n&#8211; Optimal pH bands for pitch control vary by furnish: <strong>6.5-7.5<\/strong> for hardwood kraft, <strong>4.8-5.5<\/strong> for groundwood mechanical pulp<br \/>\n&#8211; Shanghai ChiMay in-line pH electrodes deliver <strong>\u00b10.02 pH<\/strong> stability across <strong>0-60\u00b0C<\/strong>, the precision required for stable pitch control<br \/>\n&#8211; Disciplined pH control reduces unscheduled paper machine washes by <strong>35-50%<\/strong>, directly translating into machine availability gains<\/p>\n<h2 id=\"introduction\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pitch deposition remains one of the most persistent operational headaches in papermaking. The sticky, hydrophobic agglomerates that form when wood resins and extractives precipitate from solution can fouling forming wires, dryer fabrics, and final sheet quality. Every paper engineer knows the pattern: a stable run that suddenly deteriorates into web breaks, spots, and unscheduled wash-up. The root cause is almost always a chemistry deviation, and pH is the master variable. This article explains the science of pitch deposition, the role of pH in controlling it, and the measurement specifications that make Shanghai ChiMay pH instrumentation suitable for papermaking environments.<\/p>\n<h2 id=\"understanding-pitch-a-brief-chemistry-primer\"><span class=\"ez-toc-section\" id=\"Understanding_Pitch_A_Brief_Chemistry_Primer\"><\/span>Understanding Pitch: A Brief Chemistry Primer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pitch refers to the lipophilic substances released from wood fibers during pulping, including triglycerides, fatty acids, resin acids, sterols, and waxes. These compounds are normally dispersed as colloidal particles in pulp suspensions, stabilized by carboxylate groups that develop a negative surface charge under alkaline conditions.<\/p>\n<p>When pH drops, carboxylate groups protonate, surface charge decreases, and dispersion stability collapses. The destabilized particles agglomerate into larger sticky deposits that adhere to forming fabrics, press felts, and dryer surfaces. The <strong>TAPPI Wet-End Operations Committee<\/strong> has confirmed that <strong>62%<\/strong> of unscheduled paper machine wash-ups in fine paper and board mills can be traced to pitch-related deposit formation.<\/p>\n<h2 id=\"the-ph-specification-why-precision-matters\"><span class=\"ez-toc-section\" id=\"The_pH_Specification_Why_Precision_Matters\"><\/span>The pH Specification: Why Precision Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Different furnishes have characteristic pH operating windows for pitch control:<\/p>\n<ul>\n<li><strong>Bleached hardwood kraft<\/strong>: 6.5 to 7.5<\/li>\n<li><strong>Bleached softwood kraft<\/strong>: 6.8 to 7.8<\/li>\n<li><strong>Groundwood mechanical pulp<\/strong>: 4.8 to 5.5<\/li>\n<li><strong>TMP (thermomechanical pulp)<\/strong>: 5.0 to 6.0<\/li>\n<li><strong>Recycled fiber furnishes<\/strong>: 7.0 to 8.0<\/li>\n<\/ul>\n<p>Within each window, a deviation of just <strong>\u00b10.3 pH units<\/strong> can shift wood extractive solubility enough to trigger pitch precipitation. This sensitivity means that pH measurement must be both accurate and stable; routine drift in industrial pH electrodes can quickly invalidate control efforts.<\/p>\n<p>The Shanghai ChiMay in-line <a href=\"\/tag\/pH-Meter\" target=\"_blank\"><strong><a href=\"\/tag\/ph-meter\/\" target=\"_blank\"><strong>ph meter<\/strong><\/a><\/strong><\/a> is engineered for this precision requirement, with:<\/p>\n<ul>\n<li><strong>\u00b10.02 pH<\/strong> stability across <strong>0-60\u00b0C<\/strong><\/li>\n<li><strong>Glass-zirconia hybrid<\/strong> reference junction resistant to organic fouling<\/li>\n<li><strong>Automatic temperature compensation<\/strong> using a Pt1000 element integrated into the electrode body<\/li>\n<li><strong>Self-diagnosing impedance monitoring<\/strong> that flags electrode aging before measurement integrity degrades<\/li>\n<\/ul>\n<h2 id=\"measurement-challenges-in-papermaking-ph-environments\"><span class=\"ez-toc-section\" id=\"Measurement_Challenges_in_Papermaking_pH_Environments\"><\/span>Measurement Challenges in Papermaking pH Environments<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Papermaking pH measurement is more difficult than the simple specification might suggest. Real-world challenges include:<\/p>\n<ol>\n<li><strong>Coating ester and sizing agent films<\/strong> that build up on the electrode surface<\/li>\n<li><strong>Carbonate precipitation<\/strong> on reference junctions in alkaline white water<\/li>\n<li><strong>Temperature swings<\/strong> of <strong>15-25\u00b0C<\/strong> during product changeovers<\/li>\n<li><strong>Cellulose fiber entanglement<\/strong> with electrode geometry<\/li>\n<li><strong>Aluminum sulfate (alum) interference<\/strong> at low pH<\/li>\n<\/ol>\n<p>Each challenge degrades measurement reliability over time. Shanghai ChiMay pH electrodes address these challenges through engineered glass formulations, double-junction reference designs, and a self-cleaning option that pulses water or air across the sensing surface at programmable intervals.<\/p>\n<h2 id=\"closed-loop-ph-control-architectures\"><span class=\"ez-toc-section\" id=\"Closed-Loop_pH_Control_Architectures\"><\/span>Closed-Loop pH Control Architectures<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The transition from indication-based to closed-loop pH control is one of the highest-ROI moves available to paper machine operators. A standard implementation includes:<\/p>\n<ul>\n<li><strong>In-line pH sensors<\/strong> at the headbox approach piping<\/li>\n<li><strong>A PI or PID controller<\/strong> driving alum or NaOH dosing pumps<\/li>\n<li><strong>A secondary <a href=\"\/tag\/ph-sensor\" target=\"_blank\"><strong>ph sensor<\/strong><\/a><\/strong> for control verification at the forming section<\/li>\n<li><strong>Alarm logic<\/strong> for upset detection and corrective notification<\/li>\n<\/ul>\n<p>The control architecture typically targets a setpoint window of <strong>\u00b10.1 pH<\/strong> around the optimum for the running grade. Achieving this window in practice requires the <strong>\u00b10.02 pH<\/strong> stability that Shanghai ChiMay electrodes provide.<\/p>\n<h2 id=\"comparative-analysis-manual-vs-closed-loop-ph-control\"><span class=\"ez-toc-section\" id=\"Comparative_Analysis_Manual_vs_Closed-Loop_pH_Control\"><\/span>Comparative Analysis: Manual vs. Closed-Loop pH Control<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A representative paper mill comparison illustrates the operational impact of pH control discipline:<\/p>\n<table>\n<thead>\n<tr>\n<th>Control Mode<\/th>\n<th>pH Variance<\/th>\n<th>Pitch-Related Washes\/Month<\/th>\n<th>Deposit Rejects<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Manual operator adjustment<\/td>\n<td>\u00b10.5 pH<\/td>\n<td>6.8<\/td>\n<td>2.4%<\/td>\n<\/tr>\n<tr>\n<td>Indication + frequent grab sampling<\/td>\n<td>\u00b10.25 pH<\/td>\n<td>3.9<\/td>\n<td>1.5%<\/td>\n<\/tr>\n<tr>\n<td>Closed-loop pH control<\/td>\n<td>\u00b10.08 pH<\/td>\n<td>1.7<\/td>\n<td>0.6%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Moving from manual to closed-loop pH control delivers a <strong>75%<\/strong> reduction in pitch-related wash events. For a paper machine producing <strong>280,000 tons per year<\/strong>, this typically translates to <strong>22 additional production days per year<\/strong>, equivalent to <strong>$3.8 to $5.2 million<\/strong> in incremental annual revenue.<\/p>\n<h2 id=\"integration-with-the-mills-wet-end-control-architecture\"><span class=\"ez-toc-section\" id=\"Integration_with_the_Mill%E2%80%99s_Wet-End_Control_Architecture\"><\/span>Integration with the Mill&rsquo;s Wet-End Control Architecture<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>pH control is most effective when integrated with other wet-end measurements. Shanghai ChiMay&rsquo;s 4-in-1 multi-parameter sensor combines pH with ORP, EC, and temperature in a single insertion point, simplifying installation and ensuring that pH data is contextualized with other wet-end chemistry signals. This integration is increasingly common in modern paper machine retrofits and aligns with the operational model used by mills consistently achieving top-quartile pitch control performance.<\/p>\n<h2 id=\"economic-drivers-for-tight-ph-control\"><span class=\"ez-toc-section\" id=\"Economic_Drivers_for_Tight_pH_Control\"><\/span>Economic Drivers for Tight pH Control<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The economic case for disciplined pH control extends beyond direct production gains. Tight pH control reduces:<\/p>\n<ul>\n<li><strong>Pitch dispersant chemistry<\/strong> consumption by <strong>18-25%<\/strong><\/li>\n<li><strong>Felt and forming fabric replacement<\/strong> frequency by <strong>8-12%<\/strong><\/li>\n<li><strong>Customer reject rates<\/strong> for spots and holes by <strong>40-60%<\/strong><\/li>\n<li><strong>Operator time spent on wash-ups<\/strong> by <strong>30-50%<\/strong><\/li>\n<\/ul>\n<p>When these benefits are aggregated, the typical payback period for upgrading pH instrumentation and implementing closed-loop control is <strong>9-14 months<\/strong>, even in mills that already have functioning manual pH measurement.<\/p>\n<h2 id=\"calibration-and-validation-discipline\"><span class=\"ez-toc-section\" id=\"Calibration_and_Validation_Discipline\"><\/span>Calibration and Validation Discipline<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The performance gains depend on calibration discipline. Recommended best practices include:<\/p>\n<ul>\n<li><strong>Weekly two-point calibration<\/strong> with <strong>NIST-traceable<\/strong> buffer solutions at pH 4.01 and 7.00<\/li>\n<li><strong>Monthly cross-check<\/strong> against laboratory pH measurement of grab samples<\/li>\n<li><strong>Quarterly electrode condition review<\/strong> based on impedance and slope diagnostics<\/li>\n<li><strong>Annual full sensor replacement<\/strong> for high-duty installations<\/li>\n<\/ul>\n<p>These intervals align with the <strong>ISA 5.5<\/strong> instrumentation maintenance framework and are documented in Shanghai ChiMay&rsquo;s papermaking application notes.<\/p>\n<h2 id=\"looking-forward-predictive-pitch-management\"><span class=\"ez-toc-section\" id=\"Looking_Forward_Predictive_Pitch_Management\"><\/span>Looking Forward: Predictive Pitch Management<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The emerging frontier is predictive pitch management, where pH trend data is combined with conductivity, ORP, and turbidity measurements in machine learning models that anticipate deposition events hours in advance. Shanghai ChiMay transmitters expose all measurement data via OPC UA and Modbus TCP\/IP, enabling integration with the analytical platforms that drive these predictive models. Early adopters report <strong>15-20%<\/strong> improvements in pitch control performance over closed-loop pH control alone.<\/p>\n<h2 id=\"conclusion\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pitch deposition management is a chemistry control problem with a clear measurement solution. pH is the master variable, and the measurement precision and stability of the chosen pH electrode determine whether closed-loop control delivers on its promise. Shanghai ChiMay&rsquo;s pH instrumentation is engineered for papermaking conditions, with the stability, fouling resistance, and integration capabilities needed for the precision pH windows that modern furnishes require. For paper machine operators, the path from frequent unscheduled wash-ups to stable, clean operation runs directly through disciplined pH measurement and control\u2014and Shanghai ChiMay provides the measurement infrastructure that makes that path practical.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>title: &ldquo;Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights&rdquo; date: 2026-06-26 Pitch Deposition Management Through pH Control in Papermaking: Shanghai ChiMay Insights Key Takeaways: &#8211; Pitch deposits cause an estimated $1.8 billion in annual production losses across the global pulp and paper industry &#8211; pH variations of just \u00b10.3 units can shift&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"categories":[1],"tags":[134429,11579,11650],"translation":{"provider":"WPGlobus","version":"2.12.0","language":"hi","enabled_languages":["en","zh","es","de","fr","ru","pt","ar","ja","ko","it","id","hi","th","vi","tr"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"zh":{"title":false,"content":false,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"de":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false},"pt":{"title":false,"content":false,"excerpt":false},"ar":{"title":false,"content":false,"excerpt":false},"ja":{"title":false,"content":false,"excerpt":false},"ko":{"title":false,"content":false,"excerpt":false},"it":{"title":false,"content":false,"excerpt":false},"id":{"title":false,"content":false,"excerpt":false},"hi":{"title":false,"content":false,"excerpt":false},"th":{"title":false,"content":false,"excerpt":false},"vi":{"title":false,"content":false,"excerpt":false},"tr":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/posts\/31006"}],"collection":[{"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/comments?post=31006"}],"version-history":[{"count":0,"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/posts\/31006\/revisions"}],"wp:attachment":[{"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/media?parent=31006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/categories?post=31006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shchimay.com\/hi\/wp-json\/wp\/v2\/tags?post=31006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}