--- title: Extrusion Defects–Pinstriping description: Purging Expert Jeremy Cooley talks about pinstriping in extrusion and how to fix the processing defect with chemical purging compounds. image: https://www.asaclean.com/hubfs/AI-Generated%20Media/Images/This%20image%20shows%20navy%20blue%20vertical%20pinstripes%20on%20a%20white%20background.jpeg --- [ Order Online ](https://asaclean.my.site.com/b2bstore) [ Free Sample ](https://offers.asaclean.com/free-sample) ## [ Asaclean Blog ](https://www.asaclean.com/blog) Browse by Topic " aerospace asaclean asaclean news Asaclean® benefits asahi kasei automotive Best Practices black specks blisters blow molding blown-film extrusion buyers caps and closures carbon contamination cast-film extrusion Chemical Purging Compounds clear applications Color Changeovers Company News compounding consumer products contamination Cost savings custom molders Customer Success Story decreasing scrap defects electronics Energy Efficiency EX Grade extruder cleaning Extrusion fillament glass filled Glitter Grade Selection HDPE High and Low Temp Changeovers hold a bubble Hot Runners Injection Molding Injection Molding Tips LDPE Lightweight automotive components LLDPE low residue maintenance Material Changeovers Mechanical Purging Compounds medical Melt Flow Index NPE 24 nylons on the fly packaging PCR PEEK Polypropylene Post Consumer Resins preventative preventative purging processing tips profile extrusion Purge Program purge programs Purge Training Purge Trial purging purging compounds purging concentrates purging procedures Purging Tips quality recycled resins residue issues scrap reduction Screw Pulls sheet extrusion shutdown and sealing start-up super engineering resins Sustainability Tech Day technical support training trials Troubleshooting Twin Screw twin screw extrusion two step purging U Grade ULTEM venting Viscosity webinars wire extrusion - 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[LinkedIn Share ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fhigh-cavitation-injection-molding-0&title=Extrusion%20Defects%E2%80%93Pinstriping&summary=Purging+Expert+Jeremy+Cooley+talks+about+pinstriping+in+extrusion+and+how+to+fix+the+processing+defect+with+chemical+purging+compounds.&source=) - [Pinterest Pin ](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fhigh-cavitation-injection-molding-0) - [Email Email ](mailto:?subject=Extrusion%20Defects%E2%80%93Pinstriping&body=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fhigh-cavitation-injection-molding-0) ![Extrusion Defects–Pinstriping](https://www.asaclean.com/hs-fs/hubfs/AI-Generated%20Media/Images/This%20image%20shows%20navy%20blue%20vertical%20pinstripes%20on%20a%20white%20background.jpeg?width=640&height=500&name=This%20image%20shows%20navy%20blue%20vertical%20pinstripes%20on%20a%20white%20background.jpeg) ![Pinstriping In Extrusion](https://www.asaclean.com/hs-fs/hubfs/Pinstriping%20In%20Extrusion.jpg?width=344&name=Pinstriping%20In%20Extrusion.jpg) Pinstriping can be an issue for [extrusion ](https://www.asaclean.com/purging-procedures/extrusion/)applications dealing with pipe, some tubing, or blow molding with parison drops.  It’s the last stand of the old material or color in a system that can take the most amount of time to properly clean.  Many of the applications have mandrels in place that work to hold the inner diameter of the cylinder and keep the extrudant hollow in the middle.  This dimension tolerance is extremely important but can be one of the toughest areas to clean. Previous resin and color can stick behind the mandrels and if your procedure isn’t to tear down and clean manually that pinstriping could last for hours with a standard resin flush.  Luckily, there are purging compounds on the market that greatly help with the issue of pinstriping.  The best way to clean these systems is with a [chemical purging compound](https://www.asaclean.com/purging-products/asaclean-chemical-purging-grades/ncr-grade-purging-compound-formerly-supernova-regular/) and heat is key.  You want to set a higher temp around the die where the mandrels are so that you get the most effective chemical activity in that region.  This may be a secondary purge after cleaning the screw and barrel or it can be done in one shot, depending on the system and application. Those are tough areas to clean but with the correct grade of purging compound in hand it can make a color or material change on these lines much easier for the user. **Ready to reduce your ****production downtime**** to protect your profits? Learn more about how ****purging compounds**** and process efficiency work in tandem.** ![Yoko Tanaka](https://www.asaclean.com/hs-fs/hubfs/Yoko%20Tanaka%20Headshot%203-25-16.jpg?width=150&name=Yoko%20Tanaka%20Headshot%203-25-16.jpg) #### [ Yoko Tanaka ](https://www.asaclean.com/blog/author/yoko-tanaka) Yoko Tanaka is the Marketing Manager at Asaclean. She has been helping molders and extruders learn about Asaclean purging and how to improve their processes for the past eight years. - [Share On LinkedIn ](https://www.linkedin.com/in/yokotanaka/) ## Related Posts [![Purging for Extrusion: Screw & Barrel vs. Downstream](https://www.asaclean.com/hs-fs/hubfs/Blog%20Header-extrusions%20screw%20vs%20downstream.jpg?width=450&height=250&name=Blog%20Header-extrusions%20screw%20vs%20downstream.jpg) Purging for Extrusion: Screw & Barrel vs. Downstream Chemical... / 4 min read / February 01, 2022 ](https://www.asaclean.com/blog/purging-for-extrusion-screw-barrel-vs.-downstream) [![If You Are A Molder, Here's Something to Consider](https://www.asaclean.com/hs-fs/hubfs/AI-Generated%20Media/Images/a%20street%20sign%20that%20says%20good%20choice%20pointing%20in%20one%20direction%20and%20bad%20choice%20pointing%20in%20the%20other%20direction.jpeg?width=450&height=250&name=a%20street%20sign%20that%20says%20good%20choice%20pointing%20in%20one%20direction%20and%20bad%20choice%20pointing%20in%20the%20other%20direction.jpeg) If You Are A Molder, Here's Something to Consider Troubleshooting / 2 min read / December 11, 2018 ](https://www.asaclean.com/blog/if-you-are-a-molder-heres-something-to-consider) ## Comments Get Started ## Ready to start improving your efficiency and increasing your profitability? - [Request a Consultation](https://www.asaclean.com/blog/high-cavitation-injection-molding-0#) - [Contact Sales](https://www.asaclean.com/blog/high-cavitation-injection-molding-0#) ![](https://www.asaclean.com/hubfs/assets/images/icons/icon-layers.svg) #### Free Sample Request a free sample of Asaclean® Purging Compounds for your plant and start saving today. 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[See your savings](https://www.asaclean.com/cost-savings-calculator) [ Back to Top ](https://www.asaclean.com/blog/high-cavitation-injection-molding-0#top) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Yoko Tanaka", "url" : "https://www.asaclean.com/blog/author/yoko-tanaka" }, "dateModified" : "2025-07-07T15:23:02.650Z", "datePublished" : "2019-10-25T16:25:31.000Z", "headline" : "Extrusion Defects–Pinstriping", "image" : [ "https://www.asaclean.com/hubfs/AI-Generated%20Media/Images/This%20image%20shows%20navy%20blue%20vertical%20pinstripes%20on%20a%20white%20background.jpeg" ], "mainEntityOfPage" : { "@id" : "https://www.asaclean.com/blog/high-cavitation-injection-molding-0", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://www.asaclean.com/hubfs/Asaclean%20Logo%20TM.jpg" }, "name" : "Asahi Kasei Plastics North America" } } ``` ```json { "@context" : "http://schema.org", "@type" : "Article", "articleBody" : "Pinstriping can be an issue for extrusion applications dealing with pipe, some tubing, or blow molding with parison drops. It’s the last stand of the old material or color in a system that can take the most amount of time to properly clean. Many of the applications have mandrels in place that work to hold the inner diameter of the cylinder and keep the extrudant hollow in the middle. This dimension tolerance is extremely important but can be one of the toughest areas to clean.", "author" : { "@type" : "Person", "name" : "Yoko Tanaka" }, "datePublished" : "October 25, 2019", "headline" : "Extrusion Defects–Pinstriping", "image" : "https://468726.fs1.hubspotusercontent-na1.net/hubfs/468726/AI-Generated%20Media/Images/This%20image%20shows%20navy%20blue%20vertical%20pinstripes%20on%20a%20white%20background.jpeg", "name" : "Extrusion Defects–Pinstriping", "url" : "https://www.asaclean.com/blog/high-cavitation-injection-molding-0" } ```