{"id":4829,"date":"2026-07-17T05:37:23","date_gmt":"2026-07-17T05:37:23","guid":{"rendered":"https:\/\/sunonwirecloth.com\/?p=4829"},"modified":"2026-07-17T05:37:23","modified_gmt":"2026-07-17T05:37:23","slug":"common-causes-of-material-leakage-on-plastic-extruder-screen-changer","status":"publish","type":"post","link":"https:\/\/sunonwirecloth.com\/fr\/common-causes-of-material-leakage-on-plastic-extruder-screen-changer\/","title":{"rendered":"Common Causes of Material Leakage on Plastic Extruder Screen Changer"},"content":{"rendered":"

Common Causes of Material Leakage on Plastic Extruder Screen<\/a> Changer<\/h1>\n

1. Damaged & Failed Sealing Parts (Most Frequent Issue)<\/p>\n

1. The PTFE\/FKM O-rings or packing gaskets are aged, carbonized under high temperature or cracked. Long-term operation above 200\u00b0C hardens rubber seals and eliminates elasticity; seals wear out much faster during recycled plastic processing.<\/p>\n

2. Seals are installed crookedly, squeezed and cut during sliding plate feeding, leaving gaps for melt leakage.<\/p>\n

3. Carbon deposits, burnt plastic residues or metal burrs left inside seal grooves prevent full surface contact between fitting faces.<\/p>\n

2. Improper Assembly of Screen Pack<\/a> & Breaker Plate<\/p>\n

1. The outer diameter of the screen stack exceeds the breaker plate size. Woven wire mesh gets clamped between sealing surfaces and creates persistent gaps.<\/p>\n

2. The screen pack is misplaced or sticks out on one side, propping up the sliding plate and causing uneven compression.<\/p>\n

3. Uneven thickness of multi-layer screens creates bulges, leading to loose sealing pressure on partial areas.<\/p>\n

3. Insufficient Clamping Force from Hydraulic System<\/p>\n

1. Hydraulic station pressure is set too low. The sliding plate slightly backs off when melt pressure rises, resulting in slow leakage or burst spillage.<\/p>\n

2. Oil cylinder leakage, internal valve leakage or pipeline pressure loss weakens pressure holding capacity; clamping pressure drops gradually during production.<\/p>\n

3. For bolt-type manual screen changers: Bolts are not tightened evenly diagonally, leading to inadequate compression on one side.<\/p>\n

4. Scratched or Deformed Fitting Surfaces of Sliding Plate & Base<\/p>\n

1. Hard impurities and broken metal wires score or pit the sliding plate\u2019s sealing face; tiny grooves cannot be fully sealed.<\/p>\n

2. Long-term unilateral stress warps the sliding plate and exceeds flatness tolerance, resulting in partial poor contact.<\/p>\n

3. Knocks and abrasions create chipped edges on the breaker plate outer circle, destabilizing support and forming gaps.<\/p>\n

5. Abnormal Melt Pressure & Processing Temperature<\/p>\n

1. Extruder head pressure exceeds the rated pressure of the screen changer, pushing melt through micro gaps.<\/p>\n

2. Overheating reduces melt viscosity. Low-viscosity materials like PE and EVA easily seep through tiny clearances.<\/p>\n

3. Rapid temperature rise causes uneven thermal expansion of sealing components, temporarily widening gaps.<\/p>\n

6. Operational Errors During Screen Replacement<\/p>\n

1. Production starts before the sliding plate is fully pushed into position and locked firmly, which often triggers sudden massive melt ejection.<\/p>\n

2. Large burnt plastic lumps remain in flow channels after cleaning, jacking up the sliding plate and forming clearance gaps.<\/p>\n

3. Frequent rapid screen changes accelerate seal aging due to repeated drastic temperature fluctuations.<\/p>\n

7. Long-term Equipment Wear<\/p>\n

1. Excessive clearance of sliding rails makes the plate swing left and right, leading to misalignment after locking.<\/p>\n

2. Loose bolts connecting the screen changer flange and extruder head shift overall stress distribution.<\/p>\n

Quick Troubleshooting Sequence<\/p>\n

1. Check hydraulic clamping pressure first<\/p>\n

2. Inspect O-rings for damage and carbon buildup in seal grooves<\/p>\n

3. Verify whether the screen pack<\/a> is oversized or offset<\/p>\n

4. Check sliding plate sealing face for scratches and pits<\/p>\n

5. Conduct a trial run with reduced head melt pressure to rule out overpressure<\/p>\n

Professional Glossary for Foreign Trade<\/p>\n

\u2022 material leakage:<\/p>\n

\u2022 FKM \/ PTFE sealing O-ring<\/p>\n

\u2022 insufficient hydraulic pressure<\/p>\n

\u2022 scratched sliding plate<\/p>\n

\u2022 offset screen pack<\/p>\n

\u2022 carbon buildup in seal groove<\/p>\n

\u2022 excessive melt pressure<\/p>\n

\u2022 breaker plate<\/p>\n

\u2022 sliding plate screen changer<\/p>","protected":false},"excerpt":{"rendered":"

Common […]<\/p>","protected":false},"author":2,"featured_media":4831,"comment_status":"open","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":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[43],"tags":[],"class_list":["post-4829","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/posts\/4829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/comments?post=4829"}],"version-history":[{"count":1,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/posts\/4829\/revisions"}],"predecessor-version":[{"id":4832,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/posts\/4829\/revisions\/4832"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/media\/4831"}],"wp:attachment":[{"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/media?parent=4829"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/categories?post=4829"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sunonwirecloth.com\/fr\/wp-json\/wp\/v2\/tags?post=4829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}