{"id":3508,"date":"2026-09-03T11:13:34","date_gmt":"2026-09-03T11:13:34","guid":{"rendered":"https:\/\/sivite-machinery.com\/?p=3508"},"modified":"2026-09-03T11:46:14","modified_gmt":"2026-09-03T11:46:14","slug":"entretien-des-extrudeuses-de-feuilles-en-pet","status":"publish","type":"post","link":"https:\/\/sivite-machinery.com\/fr\/pet-sheet-extruder-maintenance\/","title":{"rendered":"Entretien d'une extrudeuse de plaques en PET : guide d'entretien quotidien"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3508\" class=\"elementor elementor-3508\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9b89a21 e-flex e-con-boxed e-con e-parent\" data-id=\"9b89a21\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-df81863 elementor-widget elementor-widget-text-editor\" data-id=\"df81863\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The real service life of a <a href=\"https:\/\/sivite-machinery.com\/pet-sheet-extrusion-line\/\"><strong>PET sheet extruder<\/strong><\/a> isn&#8217;t mainly determined by the equipment&#8217;s factory build quality \u2014 it&#8217;s determined by how consistently daily maintenance is carried out. The same model of machine can run reliably for 8-10 years or longer in a well-maintained factory, while a poorly maintained line may start experiencing frequent downtime, sheet defects, and rising energy costs within just 3-5 years. This article breaks down PET Sheet Extruder Maintenance into concrete actions you can execute daily, weekly, and monthly, helping you keep both equipment lifespan and sheet quality within a controllable range.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-30bb680 elementor-widget elementor-widget-heading\" data-id=\"30bb680\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Daily Maintenance Matters More for PET Extruders<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf8ca30 elementor-widget elementor-widget-text-editor\" data-id=\"cf8ca30\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>PET sheet extrusion is a high-temperature, continuous processing method, with melt temperatures typically running between 260-280\u00b0C. Equipment operating continuously under high heat and pressure means any overlooked detail can escalate into a bigger problem. For example, a partially clogged filter screen initially just raises melt pressure slightly \u2014 but left unaddressed, it can lead to abnormal screw load, motor overheating, and eventually forced downtime for repairs.<br \/>This is why more established practice in the industry is to break maintenance down into checks at different frequencies, rather than waiting for problems to appear before acting.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9329936 elementor-widget elementor-widget-heading\" data-id=\"9329936\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Daily Maintenance: Checks Before and After Every Shift<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba766da elementor-widget elementor-widget-heading\" data-id=\"ba766da\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Pre-Startup Checks<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b3983f8 elementor-widget elementor-widget-text-editor\" data-id=\"b3983f8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Raw material drying status: Confirm the dryer is functioning normally and material moisture is below 50ppm, to prevent melt bubbles and unstable extrusion caused by excess moisture<br \/>Heating zone temperatures: Verify all screw heating zones and the die have reached their set points. Normal preheating typically takes 1.5-2 hours \u2014 skipping preheating and starting cold is one of the common causes of premature screw wear<br \/>Lubrication system oil level: Check that the gearbox and bearing housings are within the normal oil level range<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b8bec0d elementor-widget elementor-widget-heading\" data-id=\"b8bec0d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Checks During and After Operation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c44cd08 elementor-widget elementor-widget-text-editor\" data-id=\"c44cd08\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Monitor the melt pressure gauge: Pressure should remain relatively stable during normal operation. A steady, gradual rise usually signals the filter screen is starting to clog and may need replacing<br \/>Clear residual material from the barrel and die at shutdown: This prevents material from degrading during prolonged high-temperature dwell time and forming carbonized deposits that are hard to remove \u2014 buildup over time affects the cleanliness of future sheet production<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6190595 elementor-widget elementor-widget-heading\" data-id=\"6190595\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Weekly Maintenance: Often-Overlooked Items with Outsized Impact<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ac9d0d4 elementor-widget elementor-widget-text-editor\" data-id=\"ac9d0d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This includes checking gearbox belt tension, coupling bolts, and whether barrel flange gaskets show signs of aging or leakage. A degraded gasket doesn&#8217;t just risk melt leakage \u2014 it can also let air enter the melt flow path, creating bubble defects in the sheet.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c68806d elementor-widget elementor-widget-heading\" data-id=\"c68806d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Weekly Maintenance: Often-Overlooked Items with Outsized Impact<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-09fc150 elementor-widget elementor-widget-text-editor\" data-id=\"09fc150\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This includes checking gearbox belt tension, coupling bolts, and whether barrel flange gaskets show signs of aging or leakage. A degraded gasket doesn&#8217;t just risk melt leakage \u2014 it can also let air enter the melt flow path, creating bubble defects in the sheet.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2aea3a1 elementor-widget elementor-widget-heading\" data-id=\"2aea3a1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Weekly Maintenance: Often-Overlooked Items with Outsized Impact<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-63014e5 elementor-widget elementor-widget-heading\" data-id=\"63014e5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1. Replacing or Cleaning the Filter Screen<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3b5ddaf elementor-widget elementor-widget-text-editor\" data-id=\"3b5ddaf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This is the most underrated but most directly impactful item on this list. The melt filter screen&#8217;s job is to catch contaminants and unmelted particles. Over time, the mesh gradually clogs, causing melt pressure to keep rising. Left unaddressed, this can range from reduced sheet cleanliness to excessive screw load, motor trips, or even damage to the filter housing itself.<br \/><strong>General recommendations:<\/strong><br \/>When processing 100% virgin material, filter screens can typically be changed every 7-10 days<br \/>When processing recycled material (especially at recycled content above 50%), contamination levels are much higher, so we recommend shortening the cycle to 3-5 days, adjusted dynamically based on actual pressure rise rate<br \/>If your equipment is fitted with an automatic screen changer, you can set a pressure threshold to trigger changes automatically, reducing human judgment error and avoiding production interruptions caused by delayed screen changes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf4131c elementor-widget elementor-widget-heading\" data-id=\"cf4131c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2. Inspecting Cooling Roller Surfaces and the Thickness Gauging System<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6d1001 elementor-widget elementor-widget-text-editor\" data-id=\"a6d1001\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Scratches or residue buildup on cooling roller surfaces show up directly as reduced sheet surface gloss. We recommend wiping the rollers weekly with a dedicated cleaning agent, avoiding metal tools that could cause scratches. Also check that the online thickness gauge&#8217;s sensor is clean and properly calibrated \u2014 recalibrate if readings deviate more than \u00b13%.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b67b702 elementor-widget elementor-widget-heading\" data-id=\"b67b702\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3. Checking Drive Components and Seals<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3681323 elementor-widget elementor-widget-text-editor\" data-id=\"3681323\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This includes checking gearbox belt tension, coupling bolts, and whether barrel flange gaskets show signs of aging or leakage. A degraded gasket doesn&#8217;t just risk melt leakage \u2014 it can also let air enter the melt flow path, creating bubble defects in the sheet.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-efcaace elementor-widget elementor-widget-heading\" data-id=\"efcaace\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Maintenance Interval Reference Table<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a87d954 elementor-widget elementor-widget-text-editor\" data-id=\"a87d954\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The intervals above are general industry reference points. Actual frequency should be adjusted dynamically based on real contamination levels, equipment operating hours, and pressure trend data.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cae885b elementor-widget elementor-widget-image\" data-id=\"cae885b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders-1024x576.jpg\" class=\"attachment-large size-large wp-image-3512\" alt=\"Maintenance Guide for PET Sheet Extruders\" srcset=\"https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders-1024x576.jpg 1024w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders-300x169.jpg 300w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders-768x432.jpg 768w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders-18x10.jpg 18w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders-600x338.jpg 600w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Maintenance-Guide-for-PET-Sheet-Extruders.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0f8c58c elementor-widget elementor-widget-heading\" data-id=\"0f8c58c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Monthly and Quarterly Maintenance: Deep Checks for Long-Term Stability<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-027fd6d elementor-widget elementor-widget-text-editor\" data-id=\"027fd6d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Screw and Barrel Wear Inspection\uff1a<\/strong><br \/>The clearance between the screw and barrel gradually increases with use. Excessive clearance causes more material backflow, directly reducing output and increasing energy consumption. We recommend quarterly measurement of screw outer diameter and barrel bore wear using proper tools. Under normal wear rates, twin screws typically last around 4-6 years, depending on the contamination level and hardness of the material processed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-01ad93f elementor-widget elementor-widget-text-editor\" data-id=\"01ad93f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Electrical System and Sensor Calibration\uff1a<\/strong><br \/>This includes checking temperature control modules, pressure sensors, and inverter cooling fans for cleanliness and proper operation. Sensors can drift over long-term use, so we recommend a full calibration every quarter to prevent misjudged process parameters due to inaccurate temperature or pressure readings.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4899cd2 elementor-widget elementor-widget-shortcode\" data-id=\"4899cd2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How often should the filter screen on a PET sheet extruder be changed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"When processing 100% virgin PET, the filter screen can typically be changed every 7-10 days. When processing recycled PET (especially over 50% recycled content), contamination levels are higher, so the interval should be shortened to every 3-5 days, adjusted based on actual melt pressure rise.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What daily maintenance checks does a PET sheet extruder require?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Daily checks include confirming raw material moisture is below 50ppm, verifying heating zones and the die have reached set temperatures after proper preheating, checking lubrication oil levels, monitoring melt pressure during operation, and clearing residual material from the barrel and die at shutdown.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How long does a PET sheet extruder typically last with proper maintenance?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"With consistent daily, weekly, and quarterly maintenance, a PET sheet extruder can typically run reliably for 8-10 years or longer. Screw and barrel components generally last around 4-6 years depending on the contamination level and hardness of the material processed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What happens if filter screen maintenance is neglected on a PET sheet extruder?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A clogged filter screen causes melt pressure to rise steadily, which can lead to abnormal screw load, motor overheating, longer melt residence time, localized thermal degradation, uneven sheet thickness, discoloration, and reduced output \u2014 sometimes by 20% or more.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>The real service life of a PET sheet extruder isn&#8217;t mainly determined by the equipment&#8217;s factory build quality \u2014 it&#8217;s [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":3509,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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