{"id":1359,"date":"2025-12-19T00:39:54","date_gmt":"2025-12-18T21:09:54","guid":{"rendered":"http:\/\/polymer-afza.com\/?p=1359"},"modified":"2025-12-19T18:11:42","modified_gmt":"2025-12-19T14:41:42","slug":"%d8%ac%d8%af%d9%88%d9%84-%d8%aa%d8%b5%d9%85%db%8c%d9%85%da%af%db%8c%d8%b1%db%8c-%d8%b3%d8%b1%db%8c%d8%b9-%d8%a8%d8%b1%d8%a7%db%8c-%d8%b9%db%8c%d8%a8%db%8c%d8%a7%d8%a8%db%8c-%d9%85","status":"publish","type":"post","link":"http:\/\/polymer-afza.com\/en\/%d8%ac%d8%af%d9%88%d9%84-%d8%aa%d8%b5%d9%85%db%8c%d9%85%da%af%db%8c%d8%b1%db%8c-%d8%b3%d8%b1%db%8c%d8%b9-%d8%a8%d8%b1%d8%a7%db%8c-%d8%b9%db%8c%d8%a8%db%8c%d8%a7%d8%a8%db%8c-%d9%85\/","title":{"rendered":"Quick Decision Table for Troubleshooting Common PVC Processing Issues"},"content":{"rendered":"
\n
Symptom Observed in Production<\/th>Likely Technical Root Causes<\/th>Direction for Correction<\/th><\/tr><\/thead>
Yellowing from the start of production<\/td>Weak initial thermal stability; early onset of degradation reactions<\/td>Review the design of the primary stabilizing system; rebalance active components<\/td><\/tr>
Color is acceptable initially but collapses suddenly<\/td>Non-linear degradation triggered by accumulation of degradation by-products<\/td>Strengthen degradation by-product control; review stabilizer balance<\/td><\/tr>
Burn marks after short stops or brief residence time increase<\/td>Insufficient stabilization under high residence time conditions<\/td>Evaluate stabilizer performance during line stops and restart conditions<\/td><\/tr>
Gels or unmelted particles in the product<\/td>the product\nIncomplete fusion; unsuitable processing aid<\/td>Review type and dosage of processing aid; reassess fusion control<\/td><\/tr>
Rough or non-uniform surface<\/td>Excessive slip or unstable fusion behavior<\/td>Adjust balance between internal and external lubrication<\/td><\/tr>
Deposits on die, mold, or rolls (Plate-out)<\/td>Additive incompatibility; saturation of lubrication system<\/td>Simplify formulation; review lubricant type and dosage<\/td><\/tr>
Progressive surface deterioration over time<\/td>Migration of poorly compatible formulation components<\/td>Check phase compatibility of formulation components with PVC<\/td><\/tr>
Higher-than-target density in foamed PVC<\/td>Melt weakening during the critical foaming stage<\/td>Review coordination between stabilizer system and foaming conditions<\/td><\/tr>
Collapsed foam or irregular cell structure<\/td>Insufficient melt strength during gas release<\/td>Reassess interaction between stabilizer system and foam regulator<\/td><\/tr>
Skin\u2013core inconsistency in foam boards<\/td>Localized thermal instability in the core region<\/td>Evaluate stabilizer endurance under high residence time<\/td><\/tr>
Extruder pressure fluctuations<\/td>Unstable rheological behavior of the melt<\/td>Fine-tune lubrication system and processing aid selection<\/td><\/tr>
Line requires constant adjustment<\/td>Formulation lacks tolerance to normal process variations<\/td>Redesign additive system for stable, repeatable processing behavio<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n\n\n

Technical Note<\/h3>\n\n\n\n

In PVC processing, most defects are not caused by a single additive.\nWhen multiple symptoms appear simultaneously, the root cause is usually a lack of coordination within the additive system, rather than a deficiency of one specific component<\/p>","protected":false},"excerpt":{"rendered":"

In PVC processing, most defects are not caused by a single additive. When multiple symptoms appear simultaneously, the root cause is usually a lack of coordination within the additive system, rather than a deficiency of one specific component<\/p>","protected":false},"author":1,"featured_media":1300,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"footnotes":""},"categories":[15],"tags":[],"class_list":["post-1359","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category----fa"],"_links":{"self":[{"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/posts\/1359","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/comments?post=1359"}],"version-history":[{"count":5,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/posts\/1359\/revisions"}],"predecessor-version":[{"id":1366,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/posts\/1359\/revisions\/1366"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/media\/1300"}],"wp:attachment":[{"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/media?parent=1359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/categories?post=1359"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/polymer-afza.com\/en\/wp-json\/wp\/v2\/tags?post=1359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}