{"id":194,"date":"2026-07-15T08:49:19","date_gmt":"2026-07-15T08:49:19","guid":{"rendered":"https:\/\/onestepblowmoldingmachine.com\/hot-runner-systems-for-isbm-machines-types-selection-and-maintenance\/"},"modified":"2026-07-15T08:49:19","modified_gmt":"2026-07-15T08:49:19","slug":"hot-runner-systems-for-isbm-machines-types-selection-and-maintenance","status":"publish","type":"post","link":"https:\/\/onestepblowmoldingmachine.com\/kk\/hot-runner-systems-for-isbm-machines-types-selection-and-maintenance\/","title":{"rendered":"Hot Runner Systems for ISBM Machines: Types, Selection, and Maintenance"},"content":{"rendered":"<nav aria-label=\"\u041d\u0430\u043d \u04af\u0433\u0456\u043d\u0434\u0456\u0441\u0456\" style=\"margin-bottom:18px;font-size:13px;color:#666;\"><a href=\"\/kk\/\" style=\"color:#0066cc;text-decoration:none;\">\u04ae\u0439<\/a> &rsaquo; <a href=\"\/kk\/products\/isbm-machines\/\" style=\"color:#0066cc;text-decoration:none;\">ISBM Machines<\/a> &rsaquo; <span>Hot Runner Systems for ISBM Machines: Types, Selection and Maintenance<\/span><\/nav>\n<h2 style=\"font-size:28px;color:#1a2e44;margin-bottom:10px;\">Hot Runner Systems for ISBM Machines: Types, Selection, and Maintenance<\/h2>\n<p style=\"font-size:16px;line-height:1.8;color:#333;margin-bottom:24px;\">The hot runner system is the thermal heart of the ISBM preform injection process. It maintains the polymer melt at precise processing temperature from the injection unit barrel all the way to the gate tip \u2014 delivering molten resin to the preform cavity without any cold runner waste and with the minimum possible temperature variation between shots. The hot runner system&#8217;s design and condition have a direct impact on preform quality, cycle time, scrap rate, and long-term process consistency.<\/p>\n<p style=\"font-size:16px;line-height:1.8;color:#333;margin-bottom:24px;\">Unlike many areas of ISBM technology where parameters can be adjusted to compensate for hardware limitations, a poorly designed or poorly maintained hot runner system creates defects \u2014 gate blush, stringing, black specks, colour variation \u2014 that cannot be process-adjusted away. Understanding the different hot runner types available, how to select the right system for each application, and the maintenance practices that keep it performing are essential knowledge for anyone running ISBM in production.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/onestepblowmoldingmachine.com\/wp-content\/uploads\/2026\/07\/hot-runner-system-1.webp\" alt=\"ISBM machine hot runner system showing manifold nozzle and zone controller configuration for preform injection\" style=\"width:100%;max-width:100%;height:auto;border-radius:8px;margin-bottom:28px;display:block;\" \/><\/p>\n<h2 style=\"font-size:24px;color:#1a2e44;border-left:4px solid #0066cc;padding-left:12px;margin-top:36px;\">Hot Runner System Components<\/h2>\n<p style=\"font-size:16px;line-height:1.8;color:#333;margin-bottom:16px;\">A complete hot runner system for ISBM comprises the following functional components, each with its own design and maintenance requirements:<\/p>\n<div style=\"display:flex;flex-wrap:wrap;gap:14px;margin-bottom:28px;\">\n<div style=\"flex:1;min-width:200px;background:#f0f7ff;border-radius:8px;padding:16px;border-top:3px solid #0066cc;\">\n    <strong style=\"color:#1a2e44;font-size:14px;\">Sprue Bush<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\">The connection point between the injection unit nozzle and the hot runner manifold. Usually heated by a band heater. Must be aligned precisely with the injection unit nozzle to prevent resin leakage at the interface.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:200px;background:#f0f7ff;border-radius:8px;padding:16px;border-top:3px solid #0066cc;\">\n    <strong style=\"color:#1a2e44;font-size:14px;\">Heated Manifold<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\">The heated distribution block that routes melt from the sprue to all nozzle positions. For multi-cavity ISBM tools (2 or 4 cavities), manifold runner balance is critical \u2014 all flow paths must deliver equal melt volume at equal temperature to each cavity.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:200px;background:#f0f7ff;border-radius:8px;padding:16px;border-top:3px solid #0066cc;\">\n    <strong style=\"color:#1a2e44;font-size:14px;\">Hot Runner Nozzles<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\">Individual heated channels from the manifold to each gate position. Each nozzle has its own heater element and thermocouple. Nozzle temperature control directly determines gate behaviour \u2014 correct temperature prevents drool and gate freeze.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:200px;background:#f0f7ff;border-radius:8px;padding:16px;border-top:3px solid #0066cc;\">\n    <strong style=\"color:#1a2e44;font-size:14px;\">Gate Tips<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\">The final orifice through which melt enters the preform cavity. The gate tip geometry, bore diameter, and tip material determine gate quality. Tips are replaceable wear components \u2014 the most frequently replaced part of the hot runner system.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:200px;background:#f0f7ff;border-radius:8px;padding:16px;border-top:3px solid #0066cc;\">\n    <strong style=\"color:#1a2e44;font-size:14px;\">Temperature Controllers<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\">PID controllers for each heated zone \u2014 manifold, each nozzle, sprue bush. Zone count ranges from 3 on simple 1-cavity systems to 8+ on 4-cavity systems. \u00b11\u00b0C zone control is the target for PET; wider variation causes gate inconsistency.<\/p>\n<\/p><\/div>\n<\/div>\n<h2 style=\"font-size:24px;color:#1a2e44;border-left:4px solid #0066cc;padding-left:12px;margin-top:36px;\">Hot Runner Types: Open Tip vs Valve Gate<\/h2>\n<div style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;margin-bottom:28px;\">\n<table style=\"width:100%;border-collapse:collapse;min-width:540px;\">\n<thead>\n<tr style=\"background-color:#1a2e44;\">\n<th style=\"color:white;background-color:#1a2e44;padding:12px 14px;text-align:left;font-size:14px;\">Feature<\/th>\n<th style=\"color:white;background-color:#1a2e44;padding:12px 14px;text-align:left;font-size:14px;\">Open Tip (Thermal Gate)<\/th>\n<th style=\"color:white;background-color:#1a2e44;padding:12px 14px;text-align:left;font-size:14px;\">Valve Gate<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color:#f8f9fa;\">\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Gate closure mechanism<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Thermal freeze of resin at gate tip (no mechanical closure)<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Mechanical pin closes gate orifice at end of injection<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Gate vestige<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Small frozen tip vestige; height varies with process<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Minimal; flush or very low vestige; highly consistent<\/td>\n<\/tr>\n<tr style=\"background-color:#f8f9fa;\">\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Drool risk between shots<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Moderate; temperature-dependent<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Very low \u2014 pin seals gate mechanically<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">System complexity<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Simple; few moving parts; lower cost<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Complex; actuator, pin, seals; higher cost<\/td>\n<\/tr>\n<tr style=\"background-color:#f8f9fa;\">\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Stretch rod compatibility<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Good; requires precise gate vestige height control<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Excellent; gate flush = zero rod interference risk<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Best applications<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Standard PET\/PETG at low-to-mid output; cost-sensitive projects<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Pharmaceutical; cosmetic; any application where gate vestige must be minimised<\/td>\n<\/tr>\n<tr style=\"background-color:#f8f9fa;\">\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Maintenance requirements<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Tip replacement; zone temperature calibration<\/td>\n<td style=\"padding:10px 14px;border-bottom:1px solid #e0e0e0;font-size:14px;\">Pin seal replacement; actuator inspection; pin tip wear monitoring in addition to above<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2 style=\"font-size:24px;color:#1a2e44;border-left:4px solid #0066cc;padding-left:12px;margin-top:36px;\">Common Hot Runner Defects and Root Causes<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/onestepblowmoldingmachine.com\/wp-content\/uploads\/2026\/07\/hot-runner-system-2.webp\" alt=\"Hot runner nozzle tip showing gate vestige and potential drool defect areas requiring maintenance and adjustment\" style=\"width:100%;max-width:100%;height:auto;border-radius:8px;margin-bottom:24px;display:block;\" \/><\/p>\n<div style=\"display:flex;flex-wrap:wrap;gap:14px;margin-bottom:28px;\">\n<div style=\"flex:1;min-width:220px;border:1px solid #dde4ec;border-radius:8px;padding:16px;\">\n    <strong style=\"color:#dc3545;font-size:14px;\">Gate Blush \/ Halo<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\"><strong>Symptoms:<\/strong> Circular haze or stress marks around the gate area of the preform or bottle base.<br \/><strong>Causes:<\/strong> Gate tip temperature too low (frozen skin sheared by incoming melt); injection speed too high relative to gate size; gate land too long creating excessive shear. Solution: raise nozzle tip temperature in 2\u00b0C increments; reduce injection speed; consider larger gate bore.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:220px;border:1px solid #dde4ec;border-radius:8px;padding:16px;\">\n    <strong style=\"color:#dc3545;font-size:14px;\">Gate Stringing \/ Drool<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\"><strong>Symptoms:<\/strong> Thread of solidified resin attached to gate vestige; strands contaminating inside of preform or mold cavity.<br \/><strong>Causes:<\/strong> Nozzle tip temperature too high; gate freeze time too short; worn gate tip bore (oversized). Solution: reduce tip temperature; increase back-pressure; replace worn tip.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:220px;border:1px solid #dde4ec;border-radius:8px;padding:16px;\">\n    <strong style=\"color:#dc3545;font-size:14px;\">Black Specks<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\"><strong>Symptoms:<\/strong> Black or brown specks visible in preform wall or at gate area.<br \/><strong>Causes:<\/strong> Resin thermal degradation in hot runner dead zones (low-flow areas); excessively high manifold temperature; contaminated resin or previous material purge residue. Solution: reduce manifold temperature; purge hot runner thoroughly; check for dead spots in runner geometry.<\/p>\n<\/p><\/div>\n<div style=\"flex:1;min-width:220px;border:1px solid #dde4ec;border-radius:8px;padding:16px;\">\n    <strong style=\"color:#dc3545;font-size:14px;\">Cavity Imbalance (Multi-Cavity)<\/strong><\/p>\n<p style=\"font-size:13px;color:#555;margin-top:8px;line-height:1.7;\"><strong>Symptoms:<\/strong> Preforms from different cavities have different weights or fill patterns despite same parameters.<br \/><strong>Causes:<\/strong> Manifold runner imbalance; nozzle temperature difference between cavities; unequal gate bore diameters from differential wear. Solution: re-calibrate all nozzle zone temperatures; check and replace worn tips; verify manifold runner balance by sequential cavity fill trials.<\/p>\n<\/p><\/div>\n<\/div>\n<h2 style=\"font-size:24px;color:#1a2e44;border-left:4px solid #0066cc;padding-left:12px;margin-top:36px;\">Hot Runner Maintenance Schedule<\/h2>\n<div style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;margin-bottom:28px;\">\n<table style=\"width:100%;border-collapse:collapse;min-width:480px;\">\n<thead>\n<tr style=\"background-color:#1a2e44;\">\n<th style=\"color:white;background-color:#1a2e44;padding:12px 14px;text-align:left;font-size:13px;\">Interval<\/th>\n<th style=\"color:white;background-color:#1a2e44;padding:12px 14px;text-align:left;font-size:13px;\">Action<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color:#f8f9fa;\">\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;font-weight:600;\">Every shift<\/td>\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;\">Check all zone temperatures at startup and confirm PID control is stable; inspect gate area for drool strings; record any temperature controller alarms<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;font-weight:600;\">Weekly<\/td>\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;\">Verify zone temperature accuracy with independent thermocouple against setpoint; clean gate tip exterior of carbonised residue; check nozzle connection fittings for leakage<\/td>\n<\/tr>\n<tr style=\"background-color:#f8f9fa;\">\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;font-weight:600;\">Every 500k cycles<\/td>\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;\">Replace gate tips as standard (do not wait for visible wear symptoms); inspect heater element resistance for aging; check thermocouple calibration<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;font-weight:600;\">Every 1M cycles<\/td>\n<td style=\"padding:9px 14px;border-bottom:1px solid #e0e0e0;font-size:13px;\">Full hot runner disassembly; clean runner bores; inspect manifold for heat damage; replace all heater elements and thermocouples as preventive action; re-verify runner balance after reassembly<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size:16px;line-height:1.8;color:#333;margin-bottom:24px;\">Hot runner spare parts \u2014 gate tips, heater elements, thermocouples, valve gate pins \u2014 for all <a href=\"\/kk\/products\/isbm-machines\/\" style=\"color:#0066cc;text-decoration:underline;\">machines in our range<\/a> are available from our parts department. <a href=\"\/kk\/contact-us\/\" style=\"color:#0066cc;text-decoration:underline;\">Contact us to order spares or discuss a hot runner maintenance programme<\/a> for your machine.<\/p>\n<h2 style=\"font-size:24px;color:#1a2e44;border-left:4px solid #0066cc;padding-left:12px;margin-top:36px;\">Frequently Asked Questions<\/h2>\n<details style=\"border:1px solid #dde4ec;border-radius:6px;margin-bottom:10px;\">\n<summary style=\"padding:14px 16px;cursor:pointer;font-weight:600;font-size:15px;color:#1a2e44;background:#f5f8fc;border-radius:6px;list-style:none;\">My hot runner zone controller shows a temperature alarm but the zone still heats \u2014 should I stop production?<\/summary>\n<div style=\"padding:14px 16px;font-size:15px;line-height:1.8;color:#444;\">A temperature deviation alarm (zone temperature above or below setpoint beyond the alarm band) while the zone still heats indicates either a failing heater element (losing power output), a thermocouple drift, or a controller PID tuning issue. Do not run PET above 295\u00b0C \u2014 if the alarm indicates overtemperature, stop immediately to prevent resin degradation and potential fire risk. If the alarm indicates undertemperature (zone struggling to reach setpoint), investigate heater element resistance \u2014 a dropping resistance value indicates imminent element failure. In either case, plan a scheduled stop to inspect the zone before it causes a production crisis.<\/div>\n<\/details>\n<details style=\"border:1px solid #dde4ec;border-radius:6px;margin-bottom:10px;\">\n<summary style=\"padding:14px 16px;cursor:pointer;font-weight:600;font-size:15px;color:#1a2e44;background:#f5f8fc;border-radius:6px;list-style:none;\">How do I purge the hot runner when changing from PET to PP (or vice versa)?<\/summary>\n<div style=\"padding:14px 16px;font-size:15px;line-height:1.8;color:#444;\">When changing from PET to PP: set hot runner temperature to PP processing range (240\u2013260\u00b0C manifold) before beginning the purge \u2014 do not purge PP through a PET-temperature hot runner as PP may degrade. Purge with PP resin (5\u201310 shots minimum) until all PET colour\/contamination is cleared. When changing from PP to PET: raise hot runner temperature to PET processing range first; purge with a commercial purging compound (e.g. Asaclean or Purgex) before introducing PET to clear PP from runner channels, then purge with PET until clean. Never leave mixed PET\/PP in the hot runner at processing temperature \u2014 the two materials degrade differently and the mixture is difficult to clear.<\/div>\n<\/details>\n<details style=\"border:1px solid #dde4ec;border-radius:6px;margin-bottom:10px;\">\n<summary style=\"padding:14px 16px;cursor:pointer;font-weight:600;font-size:15px;color:#1a2e44;background:#f5f8fc;border-radius:6px;list-style:none;\">Can I upgrade an open tip hot runner to valve gate on my existing ISBM mold?<\/summary>\n<div style=\"padding:14px 16px;font-size:15px;line-height:1.8;color:#444;\">In most cases, yes \u2014 valve gate nozzles can be retrofitted to molds originally designed for open tip systems, provided the nozzle pocket geometry in the mold can accommodate the larger valve gate nozzle body. This requires mold modifications (machining of larger nozzle pockets and actuator mounting provisions) and a replacement hot runner nozzle set. The cost of retrofit is typically 40\u201360% of a new valve gate hot runner, and the improvement in gate quality can justify this for pharmaceutical and cosmetic applications where gate vestige is a critical specification.<\/div>\n<\/details>\n<div style=\"background-color:#1a2e44;color:white;border-radius:10px;padding:28px 24px;margin-top:40px;text-align:center;\">\n<h3 style=\"color:white;font-size:22px;margin-bottom:12px;\">Hot Runner Problems Affecting Your Production Quality?<\/h3>\n<p style=\"color:#cde;font-size:15px;margin-bottom:20px;line-height:1.7;\">Share your gate defect symptoms and hot runner configuration \u2014 our process engineers can diagnose the root cause and recommend corrective action or spare parts.<\/p>\n<p>  <a href=\"\/kk\/contact-us\/\" style=\"background-color:#f0a500;color:#1a2e44;padding:13px 32px;border-radius:6px;text-decoration:none;font-weight:700;font-size:16px;display:inline-block;\">Get Hot Runner Support<\/a>\n<\/div>\n<p><script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@graph\": [\n        {\n            \"@type\": \"Article\",\n            \"headline\": \"Hot Runner Systems for ISBM Machines: Types, Selection, and Maintenance\",\n            \"description\": \"Technical guide to ISBM hot runner systems covering open tip vs valve gate types, component functions, common defects and root causes, maintenance schedule, and purging procedures.\",\n            \"author\": {\n                \"@type\": \"Organization\",\n                \"name\": \"Ever-Power ISBM Machines\"\n            }\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"My hot runner zone shows a temperature alarm but still heats \\u2014 should I stop production?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Investigate the alarm type. Overtemperature: stop immediately to prevent PET degradation above 295\\u00b0C. Undertemperature: check heater element resistance \\u2014 dropping value indicates imminent failure. Plan a scheduled stop in either case.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"How do I purge the hot runner when changing from PET to PP?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Adjust hot runner temperature to the incoming material's processing range before purging. Use a commercial purging compound between incompatible materials. Never leave mixed PET\\\/PP in the hot runner at processing temperature.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Can I upgrade an open tip hot runner to valve gate on my existing mold?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Yes, in most cases \\u2014 valve gate nozzles can be retrofitted if nozzle pocket geometry can accommodate the larger body. Retrofit cost is typically 40-60% of a new valve gate system.\"\n                    }\n                }\n            ]\n        },\n        {\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 1,\n                    \"name\": \"Home\",\n                    \"item\": \"\\\/\"\n                },\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 2,\n                    \"name\": \"ISBM Machines\",\n                    \"item\": \"\\\/products\\\/isbm-machines\\\/\"\n                },\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 3,\n                    \"name\": \"Hot Runner Systems for ISBM Machines Types Selection and Maintenance\"\n                }\n            ]\n        }\n    ]\n}<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>Home &rsaquo; ISBM Machines &rsaquo; Hot Runner Systems for ISBM Machines: Types, Selection and Maintenance Hot Runner Systems for ISBM Machines: Types, Selection, and Maintenance The hot runner system is the thermal heart of the ISBM preform injection process. It maintains the polymer melt at precise processing temperature from the injection unit barrel all the [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[125],"tags":[276,278,275,277,279],"class_list":["post-194","post","type-post","status-publish","format-standard","hentry","category-isbm-machine-blogs","tag-blow-molding-hot-runner-maintenance","tag-hot-runner-gate-defects","tag-isbm-hot-runner-system","tag-open-tip-vs-valve-gate-isbm","tag-preform-injection-hot-runner"],"_links":{"self":[{"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/posts\/194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/comments?post=194"}],"version-history":[{"count":0,"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/posts\/194\/revisions"}],"wp:attachment":[{"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/media?parent=194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/categories?post=194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onestepblowmoldingmachine.com\/kk\/wp-json\/wp\/v2\/tags?post=194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}