{"id":"wpc-tech100-article-077-en","slug":"capillary-rheometry-and-wall-slip-in-wpc","locale":"en","url":"https://woodplasticcomposite.net/guides/capillary-rheometry-and-wall-slip-in-wpc/","title":"Capillary rheometry and wall slip in WPC","answer":"A filled composite's flow measurement can depend on its interaction with the measuring wall. Rheological interpretation should consider the apparatus and corrections rather than treating every apparent viscosity as intrinsic.","author":"NFC & WPC Knowledge Reference","faqIds":["wpc-tech100-faq-077-en"],"tagIds":[],"noindex":false,"related":["wpc-tech100-article-078-en"],"version":1,"modified":"2026-10-15","reviewer":"","sections":[{"id":"technical-context","text":"Laboratory and production flow conditions may differ. Slip, pressure effects and specimen history can complicate a direct transfer from one measurement to another. Research comparing laboratory and on-line methods highlights the need for suitable process data.","heading":"Technical context","references":[],"url":"https://woodplasticcomposite.net/guides/capillary-rheometry-and-wall-slip-in-wpc/#technical-context"},{"id":"verification-plan","text":"Specify the instrument geometry and operating conditions. Use a method appropriate to the material and investigate relevant corrections with a rheology specialist. Compare predictions against actual processing observations rather than relying only on a smooth fitted curve.","heading":"What to measure and document","references":[],"url":"https://woodplasticcomposite.net/guides/capillary-rheometry-and-wall-slip-in-wpc/#verification-plan"},{"id":"practical-decision","text":"For process development, document where the data are valid. A rheology model calibrated under one set of conditions is not automatically reliable for another die or formulation. Product performance still requires separate verification.","heading":"Implications for development and specification","references":[],"url":"https://woodplasticcomposite.net/guides/capillary-rheometry-and-wall-slip-in-wpc/#practical-decision"},{"id":"reading-scope","text":"A research comparison of laboratory and on-line WPC flow measurements. Use the linked work as related reading. The practical checks above are editorial recommendations, not reported test results or a substitute for product qualification.","heading":"Related reading and evidence limits","references":[1],"url":"https://woodplasticcomposite.net/guides/capillary-rheometry-and-wall-slip-in-wpc/#reading-scope"}],"seoTitle":"Capillary rheometry and wall slip in WPC | WPC Reference","topicIds":[],"published":"2026-10-15","tableText":"Review step | Evidence to retain\nMaterial and geometry | Exact specimen or product identity\nVerification | Method, conditions and individual observations\nDecision | Approved scope and documented limitations","takeaways":"Laboratory and production flow conditions may differ.\nSpecify the instrument geometry and operating conditions.\nFor process development, document where the data are valid.","aiAssisted":true,"categoryId":"wpc-tech100-category-3","reviewedAt":"","change_note":"New focused technical draft; not a product certification or production recipe.","description":"A filled composite's flow measurement can depend on its interaction with the measuring wall.","heroImageId":"","referenceIds":["wpc-tech100-ref-rheology"],"review_status":"AI-assisted English editorial draft. Human technical review has not been recorded.","table_caption":"Evidence checklist for capillary rheometry and wall slip in wpc","seoDescription":"A filled composite's flow measurement can depend on its interaction with the measuring wall.","translationGroup":"wpc-tech100-077-2026","references":[{"url":"https://doi.org/10.3390/polym17202782","type":"web","title":"Rheology for WPC extrusion: laboratory vs on-line rheometry","noindex":false,"accessed":"2026-10-14","seoTitle":"Rheology for WPC extrusion: laboratory vs on-line rheometry","publisher":"Polymers","description":"Related reading; scope and limitations are identified in each article.","seoDescription":"Related reading; scope and limitations are identified in each article."}],"faqs":[{"question":"What evidence is needed for capillary rheometry and wall slip in WPC?","answer":"Specify the instrument geometry and operating conditions. Use a method appropriate to the material and investigate relevant corrections with a rheology specialist. Compare predictions against actual processing observations rather than relying only on a smooth fitted curve."}]}