{"id":12458,"date":"2026-04-08T13:27:23","date_gmt":"2026-04-08T11:27:23","guid":{"rendered":"https:\/\/ikv-aachen.de\/rp\/extrusion-rheometer\/"},"modified":"2026-05-19T14:59:34","modified_gmt":"2026-05-19T12:59:34","slug":"extrusion-rheometer","status":"publish","type":"cpt_ikv_rp","link":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/","title":{"rendered":"Extrusion rheometer"},"content":{"rendered":"<style type=\"text\/css\">\n    #single-header-block_72966068821fe4ad1540bb08bc502617 .swiperThumbsNavi .swiper-slide {\n        opacity: 0.4;\n    }\n\n    #single-header-block_72966068821fe4ad1540bb08bc502617 .swiperThumbsNavi .swiper-slide-thumb-active {\n        opacity: 1;\n    }\n<\/style>\n    <section id=\"single-header-block_72966068821fe4ad1540bb08bc502617\" class=\"block-single-header theGridWrapper \">\n        <div class=\"theGrid12\">\n            <div class=\" col-start-2 col-span-10 md:col-start-3  md:col-span-8\">\n                <h2 class=\"font-serif font-semibold text-blue text-sm w-4\/5\">\n                    Novel approach to determining shear viscosity for wall-sliding rubber compounds                <\/h2>\n                                    <div class=\"mt-base text-blue text-sm font border-l-8  border-blue pl-base my-12 leading-normal \">\n                        To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.                    <\/div>\n                                            <\/div>\n        <\/div>\n    <\/section>\n\n\n<figure class=\" relative flex flex-col gap-2xs mb-xs md:mb-l xl:mb-xl\"><img decoding=\"async\"  class=\" w-full  \"  src=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-scaled.jpg\" srcset=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-748x289.jpg 748w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-1536x593.jpg 1536w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-768x296.jpg 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" width=\"1536\" height=\"593\" alt=\"IGF 23114 N\" loading=\"lazy\" \/><span class=\" text-copyright order-3 justify-end text-right w-full  w-full \">&copy; IKV<\/span><figcaption class=\" w-full  text-figcaption justify-end text-right \">Fig. 1: Measurement setup of the extrusion rheometer for recording wall shear stress.<\/figcaption><\/figure>\n\n\n<p class=\"wp-block-paragraph\"><br>Recording the complete pressure curve along a rectangular capillary rheometer makes it possible to detect the transition between wall adhesion and wall sliding. To this end, one side of an in-line rheometer is replaced by a membrane, which undergoes deformation under pressure, thus enabling continuous location-dependent recording of pressure changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The expected sharp drop in pressure in the rheometer, however, results in a levelling out of the membrane deformation due to the membrane\u2019s mechanical coupling with itself. This leads to a significant error propagation, which makes it difficult to identify the pressure curve precisely and thus the wall slip. To decouple the membrane, it is divided into individual segments that can deform independently of each other under pressure. With the segmented membrane rheometer, it is possible in principle to map the pressure curve within a capillary. The curvature of the segments provides an indication of the prevailing pressure level underneath.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In some cases, the transition between wall adhesion and wall sliding cannot be detected in the segmented membrane rheometer \u2013 either because it does not occur or because the resolution of the rheometer is not high enough. In such cases, the wall shear stress can be measured indirectly. For this purpose, a metal strip is inserted into a conventional rectangular channel, which is clamped only at the inlet of the rheometer and decoupled from the wall by a PTFE layer. It can thus be stretched by the flowing rubber and the wall shear stress then leads to an elongation that accumulates up to the clamping point. The elongation is recorded by a glass fibre strain sensor as shown in the measurement setup in Figure\u00a01.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The wall shear stress can be read from the strain gradient, because a change in the gradient means a change in the flow conditions because the underlying shear stress level changes. In the project, roughening the surface of the measuring strip led to an increase in the strain gradient, which is only possible when wall sliding is present. The wall shear stress can be deduced from the strain gradient, as a change in the gradient indicates a change in the flow conditions because the underlying shear stress level changes. In the project, roughening the surface of the measuring strip led to an increase in the strain gradient, which is only possible when wall sliding occurs.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Project data and funding<\/summary>\n<p class=\"wp-block-paragraph\">We would like to thank the BMWE for funding the IGF project (funding code 23114 N) and the project partners for their cooperation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Project duration: 01.11.2023 &#8211; 31.10.2025<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Promotion:<\/p>\n\n\n<section id=\"logo-bar-block_b8de900cd0ff4fbb2552713852a5018e\" class=\"block-logo-bar py-2xl  clear-both\">\n    <div class=\"theGridWrapper overflow-hidden  \">\n        <div class=\"grid grid-cols-[repeat(auto-fill,minmax(140px,1fr))] gap-base\">\n                            <figure class=\" relative h-full  \"><img decoding=\"async\" fetchpriority=\"low\"  class=\" object-contain w-full h-full mb-base  \"  src=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2024\/10\/BMWE-Logo.png\" srcset=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2024\/10\/BMWE-Logo.png 500w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2024\/10\/BMWE-Logo-335x335.png 335w\" sizes=\"auto, (max-width: 748px) 100vw, 748px\" width=\"500\" height=\"500\" alt=\"BMWE-Logo\" loading=\"lazy\" \/><\/figure>                                <\/div>\n    <\/div>\n<\/section>\n<\/details>\n","protected":false},"excerpt":{"rendered":"<p>To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.<\/p>\n","protected":false},"featured_media":12117,"parent":0,"template":"","tags":[1545,886,1046,1546],"research_fields":[856,816],"class_list":["post-12458","cpt_ikv_rp","type-cpt_ikv_rp","status-publish","has-post-thumbnail","hentry","tag-capillary-rheometer","tag-extrusion-rheometer","tag-rubber-technology","tag-wall-slip","research_fields-extrusion-en","research_fields-rubber-technology"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Extrusion rheometer | IKV-Aachen<\/title>\n<meta name=\"description\" content=\"To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Extrusion rheometer | IKV-Aachen\" \/>\n<meta property=\"og:description\" content=\"To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/\" \/>\n<meta property=\"og:site_name\" content=\"IKV-Aachen\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/profile.php?id=523026911193540&amp;_rdr\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-19T12:59:34+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"988\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/\",\"url\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/\",\"name\":\"Extrusion rheometer | IKV-Aachen\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ikv-aachen.de\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/IGF-23114-N-scaled.jpg\",\"datePublished\":\"2026-04-08T11:27:23+00:00\",\"dateModified\":\"2026-05-19T12:59:34+00:00\",\"description\":\"To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/#primaryimage\",\"url\":\"https:\\\/\\\/ikv-aachen.de\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/IGF-23114-N-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/ikv-aachen.de\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/IGF-23114-N-scaled.jpg\",\"width\":2560,\"height\":988,\"caption\":\"Fig. 1: Measurement setup of the extrusion rheometer for recording wall shear stress.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/rp\\\/extrusion-rheometer\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Extrusion rheometer\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/\",\"name\":\"IKV-Aachen\",\"description\":\"Forschung f\u00fcr die Praxis\",\"publisher\":{\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/#organization\"},\"alternateName\":\"Institut f\u00fcr Kunststoffverarbeitung\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-GB\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/#organization\",\"name\":\"IKV-Aachen\",\"alternateName\":\"Institut f\u00fcr Kunststoffverarbeitung (IKV)\",\"url\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/ikv-aachen.de\\\/wp-content\\\/uploads\\\/2025\\\/02\\\/ikv-ikv-1.png\",\"contentUrl\":\"https:\\\/\\\/ikv-aachen.de\\\/wp-content\\\/uploads\\\/2025\\\/02\\\/ikv-ikv-1.png\",\"width\":512,\"height\":512,\"caption\":\"IKV-Aachen\"},\"image\":{\"@id\":\"https:\\\/\\\/ikv-aachen.de\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/profile.php?id=523026911193540&_rdr\",\"https:\\\/\\\/www.instagram.com\\\/ikvaachen\\\/\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Extrusion rheometer | IKV-Aachen","description":"To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/","og_locale":"en_GB","og_type":"article","og_title":"Extrusion rheometer | IKV-Aachen","og_description":"To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.","og_url":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/","og_site_name":"IKV-Aachen","article_publisher":"https:\/\/www.facebook.com\/profile.php?id=523026911193540&_rdr","article_modified_time":"2026-05-19T12:59:34+00:00","og_image":[{"width":2560,"height":988,"url":"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-scaled.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Estimated reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/","url":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/","name":"Extrusion rheometer | IKV-Aachen","isPartOf":{"@id":"https:\/\/ikv-aachen.de\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/#primaryimage"},"image":{"@id":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/#primaryimage"},"thumbnailUrl":"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-scaled.jpg","datePublished":"2026-04-08T11:27:23+00:00","dateModified":"2026-05-19T12:59:34+00:00","description":"To record wall slip effects in the rubber extrusion process, continuous measurement of pressure or wall shear stress is required. In the \u2018Extrusion Rheometer\u2019 research project, a combination of innovative extrusion rheometers was developed for this purpose, which can be used to measure both the local pressure at every point of the rheometer as well as the wall shear stress within the flow.","breadcrumb":{"@id":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/#primaryimage","url":"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-scaled.jpg","contentUrl":"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/IGF-23114-N-scaled.jpg","width":2560,"height":988,"caption":"Fig. 1: Measurement setup of the extrusion rheometer for recording wall shear stress."},{"@type":"BreadcrumbList","@id":"https:\/\/ikv-aachen.de\/en\/rp\/extrusion-rheometer\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/ikv-aachen.de\/en\/"},{"@type":"ListItem","position":2,"name":"Extrusion rheometer"}]},{"@type":"WebSite","@id":"https:\/\/ikv-aachen.de\/en\/#website","url":"https:\/\/ikv-aachen.de\/en\/","name":"IKV-Aachen","description":"Forschung f\u00fcr die Praxis","publisher":{"@id":"https:\/\/ikv-aachen.de\/en\/#organization"},"alternateName":"Institut f\u00fcr Kunststoffverarbeitung","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/ikv-aachen.de\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-GB"},{"@type":"Organization","@id":"https:\/\/ikv-aachen.de\/en\/#organization","name":"IKV-Aachen","alternateName":"Institut f\u00fcr Kunststoffverarbeitung (IKV)","url":"https:\/\/ikv-aachen.de\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/ikv-aachen.de\/en\/#\/schema\/logo\/image\/","url":"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2025\/02\/ikv-ikv-1.png","contentUrl":"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2025\/02\/ikv-ikv-1.png","width":512,"height":512,"caption":"IKV-Aachen"},"image":{"@id":"https:\/\/ikv-aachen.de\/en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/profile.php?id=523026911193540&_rdr","https:\/\/www.instagram.com\/ikvaachen\/"]}]}},"_links":{"self":[{"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/rp\/12458","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/rp"}],"about":[{"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/types\/cpt_ikv_rp"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/media\/12117"}],"wp:attachment":[{"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/media?parent=12458"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/tags?post=12458"},{"taxonomy":"research_fields","embeddable":true,"href":"https:\/\/ikv-aachen.de\/en\/wp-json\/wp\/v2\/research_fields?post=12458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}