{"id":9379,"date":"2024-01-19T01:00:00","date_gmt":"2024-01-19T01:00:00","guid":{"rendered":"https:\/\/uplastech.com\/resin-dryer-dew-point-audit-moulding-quote\/"},"modified":"2026-11-08T08:12:57","modified_gmt":"2026-11-08T08:12:57","slug":"resin-dryer-dew-point-audit-moulding-quote","status":"publish","type":"post","link":"https:\/\/uplastech.com\/it\/resin-dryer-dew-point-audit-moulding-quote\/","title":{"rendered":"Resin Dryer Dew Point: Splay and the Supply Contract"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure 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ul.cta-need li{color:#e4f0f2;font-size:14.5px;padding-left:18px;position:relative;margin:0}\n.upl-blog ul.cta-need li::before{content:\"\\2713\";position:absolute;left:0;color:#e07a1f;font-weight:700}\n\/* ==UPL-CONVERSION-MODULES-END== *\/\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}.upl-blog ul.conv-need,.upl-blog ul.cta-need{grid-template-columns:1fr}.upl-blog .problem,.upl-blog .steps,.upl-blog .conv,.upl-blog .checklist{padding:18px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae\u3002\n   \u6ce8\u610f\uff1aClick to Chat \u7684\u70b9\u51fb\u903b\u8f91\u662f\u300c\u95ee\u5019\u5361\u5143\u7d20\u5b58\u5728\u5c31\u4e0d\u8df3\u8f6c\u300d\uff0c\u53ea\u9760 CSS \u9690\u85cf\u4f1a\u8ba9\u6c14\u6ce1\u53d8\u6210\u6b7b\u94fe\u63a5\u3002\n   Code Snippets #9\u300cUPL single post: WhatsApp bubble jumps straight to chat\u300d\u8d1f\u8d23\u628a\u8be5\u8282\u70b9\u4ece DOM \u79fb\u9664\uff0c\n   \u4e0b\u9762\u8fd9\u6761 CSS \u53ea\u662f\u79fb\u9664\u524d\u7684\u89c6\u89c9\u515c\u5e95\u3002\u5220 #9 \u524d\u5fc5\u987b\u5148\u5220\u8fd9\u6761\u89c4\u5219\u3002 *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/11\/2024-resin-dryer-dew-point-audit-moulding-quote-hero.jpg\" alt=\"Real production view of an injection moulding machine and moulded parts\" width=\"1536\" height=\"909\"><figcaption>Real injection molding production context. Photo: Pexels.<\/figcaption><\/figure>\n<div class=\"problem\">\n<p class=\"mod-h\">The problem<\/p>\n<p><b>Symptom.<\/b> PC housings show silver splay on 30 % of a run after the desiccant dryer dew point drifts from -40 C to -10 C, lifting resin moisture from 200 ppm to 650 ppm.<\/p>\n<p><b>What it costs.<\/b> Splayed PC parts fail visual inspection and the dried resin lot is suspect, so a batch is scrapped while moulder and buyer argue over whether the dryer or the resin supplier owns the moisture.<\/p>\n<p class=\"problem-promise\">This guide links dew point to resin moisture and splay, sets the drying figures for PC and PA, and writes a dryer verification clause into the supply contract.<\/p>\n<\/div>\n<div class=\"toc\"><\/div>\n<h2 id=\"what-a-dew-point-drift-looks-like-on-the-part\">What a dew-point drift looks like on the part<\/h2>\n<p>Splay is hydrolysed PC, not a flow mark. A dryer dew point drifting from -40 C to -10 C carries about twenty times the water vapour, lifting resin moisture from 200 to 650 ppm and marking 30 % of parts.<\/p>\n<table>\n<thead>\n<tr>\n<th>Observed result<\/th>\n<th>Most likely cause<\/th>\n<th>First check on the line<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Silver splay on 30 % of PC parts<\/td>\n<td>Dew point drifted to -10 C<\/td>\n<td>Measure dew point at the hopper inlet<\/td>\n<\/tr>\n<tr>\n<td>Moisture reads 650 ppm<\/td>\n<td>Saturated desiccant bed<\/td>\n<td>Check the regeneration heater and log<\/td>\n<\/tr>\n<tr>\n<td>Splay with normal 200 ppm moisture<\/td>\n<td>Shear or a hot runner fault<\/td>\n<td>Look at injection speed and gate size<\/td>\n<\/tr>\n<tr>\n<td>Splay returns after a long idle<\/td>\n<td>Hopper hose leak or no airflow<\/td>\n<td>Check airflow and hose seals<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 - Reading a splay fault before blaming the mould<\/p>\n<div class=\"callout\">Record which of these you are actually seeing before changing any setting. Two faults can look identical on the line and need opposite corrections.<\/div>\n<p><!-- upl-conv-v1 quickcta --><\/p>\n<div class=\"quickcta\">\n<p class=\"mod-h\">Need a fixed price for this moulded part?<\/p>\n<p>Send the 2D drawing, resin grade and annual volume. Our engineers return a DFM review, a material recommendation and a written quotation you can compare line by line.<\/p>\n<p class=\"quickcta-act\"><a class=\"quickcta-btn\" href=\"https:\/\/uplastech.com\/injection-molding\/\">Get a moulding quotation<\/a><a class=\"quickcta-alt\" href=\"mailto:john@uplastech.com\">Email john@uplastech.com<\/a><a class=\"quickcta-alt\" href=\"https:\/\/wa.me\/8617717529949\">WhatsApp<\/a><\/p>\n<\/div>\n<h2 id=\"separate-wet-resin-from-a-moulding-fault\">Separate wet resin from a moulding fault<\/h2>\n<p>Measure dew point at the hopper inlet with a portable meter and take a Karl Fischer moisture sample from the same lot. A -10 C reading with 650 ppm is the dryer; normal 200 ppm with splay points at shear.<\/p>\n<div class=\"steps\">\n<p class=\"mod-h\">A five-step diagnostic sequence<\/p>\n<ol>\n<li><b>Measure dew point at the hopper inlet.<\/b><br \/>A drift from -40 C to -10 C raises the air's water load about twentyfold and explains the splay.<\/li>\n<li><b>Take a Karl Fischer moisture sample.<\/b><br \/>Confirm 200 ppm target against 650 ppm; normal moisture with splay means look at shear, not the dryer.<\/li>\n<li><b>Check the desiccant bed and regeneration.<\/b><br \/>A saturated bed or a failed 200 C heater lets dew point climb; log regeneration per batch.<\/li>\n<li><b>Verify the drying time and temperature.<\/b><br \/>Hold PC at 120 C for 4 h and PA6 at 80 C for 6 h with measured airflow.<\/li>\n<li><b>Re-dry and re-mould a short trial.<\/b><br \/>Quarantine the lot, re-dry under -40 C dew point and confirm moisture under 200 ppm.<\/li>\n<\/ol>\n<\/div>\n<p>The chart below is a typical result from that measurement step. Use it to separate a design limit from a setting that can still be recovered.<\/p>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/11\/resin-dryer-dew-point-audit-moulding-quote-chart.jpg\" alt=\"Resin Dryer Dew Point: Splay and the Supply Contract: calculated response trend and an illustrative root-cause split\" width=\"1536\" height=\"909\"><figcaption>Figure 1 \u2014 Calculated response trend and an illustrative root-cause split. Values are engineering guidance for diagnosis, not a measured survey; confirm them on your own line before changing a drawing or a specification.<\/figcaption><\/figure>\n<h2 id=\"drying-figures-for-the-supply-contract\">Drying figures for the supply contract<\/h2>\n<p>Put the figures in the supply contract: PC at 120 C for 4 h, PA6 at 80 C for 6 h, a hopper-inlet dew point of -30 C or below, and resin moisture at most 200 ppm by Karl Fischer per lot.<\/p>\n<table class=\"spec\">\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Typical target<\/th>\n<th>What goes wrong outside it<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Hopper-inlet dew point<\/td>\n<td>-30 C or below, target -40 C<\/td>\n<td>At -10 C moisture reaches 650 ppm<\/td>\n<\/tr>\n<tr>\n<td>PC drying condition<\/td>\n<td>120 C for 4 h<\/td>\n<td>Short drying leaves splay on the part<\/td>\n<\/tr>\n<tr>\n<td>PA6 drying condition<\/td>\n<td>80 C for 6 h<\/td>\n<td>PA6 hydrolyses above 0.2 % moisture<\/td>\n<\/tr>\n<tr>\n<td>Resin moisture, Karl Fischer<\/td>\n<td>At most 200 ppm for PC<\/td>\n<td>650 ppm hydrolyses PC at melt temperature<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 - Drying parameters for the supply contract<\/p>\n<h2 id=\"desiccant-bed-and-airflow-that-hold-dew-point\">Desiccant bed and airflow that hold dew point<\/h2>\n<p>A saturated desiccant bed, a failed 200 C regeneration heater or a leaky hopper hose all push dew point up. At -10 C the air holds roughly 2.3 g per cubic metre of water against 0.12 at -40 C.<\/p>\n<table>\n<thead>\n<tr>\n<th>Decision<\/th>\n<th>Effect on moisture<\/th>\n<th>Trade-off<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Regenerate or replace the desiccant<\/td>\n<td>Returns dew point to -40 C<\/td>\n<td>A regeneration cycle or new bed<\/td>\n<\/tr>\n<tr>\n<td>Re-dry PC at 120 C for 4 h<\/td>\n<td>Brings moisture under 200 ppm<\/td>\n<td>4 h of dryer time per lot<\/td>\n<\/tr>\n<tr>\n<td>Verify dew point at the hopper inlet<\/td>\n<td>Catches drift before moulding<\/td>\n<td>A calibrated portable meter<\/td>\n<\/tr>\n<tr>\n<td>Raise melt temperature to hide splay<\/td>\n<td>Masks the silver streaks<\/td>\n<td>Risks more hydrolysis and brittleness<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 - Decisions ranked by batch cost<\/p>\n<div class=\"myth\"><b>Myth:<\/b> \"A process adjustment will fix it.\" Once a design limit is reached, more tuning only adds cost and variation. Confirm the limit with a measurement, then change the drawing or the specification.<\/div>\n<h2 id=\"write-dryer-verification-into-the-order\">Write dryer verification into the order<\/h2>\n<p>Agree verification before the run: a calibrated dew-point meter at the hopper inlet, a Karl Fischer result under 200 ppm, a drying record of 120 C for 4 h, and a desiccant regeneration log per batch.<\/p>\n<div class=\"conv\">\n<p class=\"mod-h\">Not sure whether the fault is in the tool or the process?<\/p>\n<p>Send us the drawing, the process window and a few sample parts. We will tell you which change fixes the fault before you commit to a tool modification.<\/p>\n<p class=\"conv-lbl\">What to send us<\/p>\n<ul class=\"conv-need\">\n<li>Part drawing with the affected dimension<\/li>\n<li>Current process settings<\/li>\n<li>Sample parts from a good and a bad batch<\/li>\n<li>Annual volume<\/li>\n<\/ul>\n<p><a class=\"conv-btn\" href=\"\/injection-molding\/\">Send the part for review<\/a>\n<\/div>\n<h2 id=\"recovery-actions-ranked-by-batch-cost\">Recovery actions ranked by batch cost<\/h2>\n<p>For a splayed batch, quarantine the lot and re-dry at 120 C for 4 h under a verified -40 C dew point. Re-mould a short trial; if moisture stays above 200 ppm, replace the desiccant before the next run.<\/p>\n<div class=\"callout\">Validate one change at a time and keep the measurement record. A supplier discussion backed by data is resolved in days, not weeks.<\/div>\n<div class=\"checklist\">\n<p class=\"mod-h\">Before you release this injection moulding job<\/p>\n<ul>\n<li>A hopper-inlet dew point of -30 C or below is written into the supply contract<\/li>\n<li>PC drying at 120 C for 4 h and PA6 at 80 C for 6 h are specified<\/li>\n<li>A maximum resin moisture of 200 ppm by Karl Fischer is agreed per lot<\/li>\n<li>A calibrated dew-point meter and a desiccant regeneration log are required<\/li>\n<li>First-article approval includes a moisture result and a drying record for the resin lot<\/li>\n<\/ul>\n<p class=\"cl-note\">Attach this list to the RFQ. Most moulding faults are decided at the drawing stage.<\/p>\n<\/div>\n<div class=\"faq\">\n<h3>Why does splay appear when the dryer is running?<\/h3>\n<p>The dryer runs but its dew point drifted from -40 C to -10 C. That air carries about twenty times more water vapour, lifting PC moisture from 200 to 650 ppm.<\/p>\n<h3>How do we confirm it is the dryer?<\/h3>\n<p>Measure dew point at the hopper inlet and take a Karl Fischer sample. A -10 C reading with 650 ppm is the dryer; 200 ppm with splay points at shear.<\/p>\n<h3>What drying figures belong in the contract?<\/h3>\n<p>PC at 120 C for 4 h, PA6 at 80 C for 6 h, hopper-inlet dew point -30 C or below, and resin moisture at most 200 ppm by Karl Fischer.<\/p>\n<h3>Why is dew point better than dryer temperature?<\/h3>\n<p>Hot air can still be wet. Dew point measures the water actually in the air: at -40 C about 0.12 g per cubic metre, at -10 C about 2.3.<\/p>\n<h3>Can a hotter melt hide the splay?<\/h3>\n<p>It masks the streaks but drives more hydrolysis, so parts turn brittle. Re-dry the resin under a verified -40 C dew point instead.<\/p>\n<h3>Who owns a splayed batch?<\/h3>\n<p>Put it in the supply contract. Name the dew point, drying time, 200 ppm moisture limit and a verification record so the lot is judged by a meter reading.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Get a mouldable part and a fixed quotation<\/p>\n<p>Send us the part file and the failure history. Our engineers will return a DFM review, a material recommendation and a fixed quotation with a defined first-article acceptance test.<\/p>\n<p class=\"cta-lbl\">To get an accurate quote, send:<\/p>\n<ul class=\"cta-need\">\n<li>3D file or 2D part drawing<\/li>\n<li>Resin grade and any regrind limit<\/li>\n<li>Annual volume and target unit price<\/li>\n<li>The failed sample or defect photos<\/li>\n<\/ul>\n<p><a class=\"btn\" href=\"\/injection-molding\/\">Request a DFM review and quote<\/a><br \/>\n<!-- upl-conv-v1 contact --><\/p>\n<div class=\"contactbar\">\n<p class=\"contactbar-h\">Prefer to talk it through first?<\/p>\n<p>Email <a href=\"mailto:john@uplastech.com\">john@uplastech.com<\/a> or message us on <a href=\"https:\/\/wa.me\/8617717529949\">WhatsApp +86 177 1752 9949<\/a>. Send a drawing, a sample or a specification and an engineer will reply.<\/p>\n<\/div>\n<p><!-- upl-conv-v1 trust --><\/p>\n<div class=\"trust\">\n<p class=\"trust-h\">Why buyers work with Uplastech<\/p>\n<p>ISO 9001, ISO 14001 and ISO 45001 certified. Founded in 2016, with injection moulding lines in Shanghai and an extrusion plant in Jiangsu. Moulding machines from 90T to 1100T and a maximum shot weight of 5100 g. Samples and a written quotation are available on request.<\/p>\n<\/div>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/injection-molding-tolerances\/\">Injection molding tolerances: what to specify<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/snap-fit-design\/\">Snap-fit design: strain, deflection and retention<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/plastic-part-assembly-design\/\">Plastic part assembly design<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/dfm-review-checklist\/\">DFM review checklist<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/injection-molding-material-selection\/\">Injection molding material selection<\/a><\/li>\n<\/ul>\n<p><!-- upl-conv-v1 service --><\/p>\n<p class=\"rel-svc\">Ready to specify? See our <a href=\"https:\/\/uplastech.com\/injection-molding\/\">injection moulding services<\/a> or <a href=\"mailto:john@uplastech.com\">request a written quotation<\/a>.<\/p>\n<\/div>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why does splay appear when the dryer is running?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The dryer runs but its dew point drifted from -40 C to -10 C. That air carries about twenty times more water vapour, lifting PC moisture from 200 to 650 ppm.\"}}, {\"@type\": \"Question\", \"name\": \"How do we confirm it is the dryer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Measure dew point at the hopper inlet and take a Karl Fischer sample. A -10 C reading with 650 ppm is the dryer; 200 ppm with splay points at shear.\"}}, {\"@type\": \"Question\", \"name\": \"What drying figures belong in the contract?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"PC at 120 C for 4 h, PA6 at 80 C for 6 h, hopper-inlet dew point -30 C or below, and resin moisture at most 200 ppm by Karl Fischer.\"}}, {\"@type\": \"Question\", \"name\": \"Why is dew point better than dryer temperature?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Hot air can still be wet. Dew point measures the water actually in the air: at -40 C about 0.12 g per cubic metre, at -10 C about 2.3.\"}}, {\"@type\": \"Question\", \"name\": \"Can a hotter melt hide the splay?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It masks the streaks but drives more hydrolysis, so parts turn brittle. Re-dry the resin under a verified -40 C dew point instead.\"}}, {\"@type\": \"Question\", \"name\": \"Who owns a splayed batch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Put it in the supply contract. Name the dew point, drying time, 200 ppm moisture limit and a verification record so the lot is judged by a meter reading.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This guide links dew point to resin moisture and splay, sets the drying figures for PC and PA, and writes a dryer verification clause into the supply contract.<\/p>","protected":false},"author":1,"featured_media":9377,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-9379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-injection-molding"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/posts\/9379","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/comments?post=9379"}],"version-history":[{"count":1,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/posts\/9379\/revisions"}],"predecessor-version":[{"id":9936,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/posts\/9379\/revisions\/9936"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/media\/9377"}],"wp:attachment":[{"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/media?parent=9379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/categories?post=9379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uplastech.com\/it\/wp-json\/wp\/v2\/tags?post=9379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}