--- title: 5 Ways to Improve Color Changes in High-Cavitation Hot Runners description: Master 5 tips for quicker color changes in high cavitation hot runner molds. Streamline your process and save time and resin today! image: https://www.asaclean.com/hubfs/Injection%20Molding-Hot%20Runner-Caps%20%26%20Closures-Plus%20Grade-Packaging-Bottle%20Caps%201.jpg --- [ 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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[Twin Screw](https://www.asaclean.com/blog/topic/twin-screw) - [twin screw extrusion](https://www.asaclean.com/blog/topic/twin-screw-extrusion) - [two step purging](https://www.asaclean.com/blog/topic/two-step-purging) - [U Grade](https://www.asaclean.com/blog/topic/u-grade) - [ULTEM](https://www.asaclean.com/blog/topic/ultem) - [venting](https://www.asaclean.com/blog/topic/venting) - [Viscosity](https://www.asaclean.com/blog/topic/viscosity) - [webinars](https://www.asaclean.com/blog/topic/webinars) - [wire extrusion](https://www.asaclean.com/blog/topic/wire-extrusion) [ Subscribe ](https://www.asaclean.com/blog/caps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds#subscribe-modal) ### Suscribirse Troubleshooting / 3 min read / April 16, 2024 # 5 Ways to Improve Color Changes in High-Cavitation Hot Runners - [Facebook Share ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fcaps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds) - [Twitter Tweet ](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fcaps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds&text=5+Ways+to+Improve+Color+Changes+in+High-Cavitation+Hot+Runners) - [LinkedIn Share ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fcaps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds&title=5%20Ways%20to%20Improve%20Color%20Changes%20in%20High-Cavitation%20Hot%20Runners&summary=Master+5+tips+for+quicker+color+changes+in+high+cavitation+hot+runner+molds.+Streamline+your+process+and+save+time+and+resin+today%21&source=) - [Pinterest Pin ](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fcaps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds) - [Email Email ](mailto:?subject=5%20Ways%20to%20Improve%20Color%20Changes%20in%20High-Cavitation%20Hot%20Runners&body=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fcaps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds) ![5 Ways to Improve Color Changes in High-Cavitation Hot Runners](https://www.asaclean.com/hs-fs/hubfs/Injection%20Molding-Hot%20Runner-Caps%20%26%20Closures-Plus%20Grade-Packaging-Bottle%20Caps%201.jpg?width=640&height=500&name=Injection%20Molding-Hot%20Runner-Caps%20%26%20Closures-Plus%20Grade-Packaging-Bottle%20Caps%201.jpg) ![OTF Color Change](https://www.asaclean.com/hs-fs/hubfs/OTF%20Color%20Change.jpg?width=414&name=OTF%20Color%20Change.jpg) Do you struggle wasting time and resin when changing dark to light colors with hot runner tools? Do you have to manually close off cavities due to poor flow through the mold, or worse yet, do they close off by themselves due to carbon buildup? Do you get the previous color bleeding out into the next color after changing over and during the run? If you answered yes to any of these questions, don't worry. By following these tips, you can take control of your color changes and achieve them more efficiently. Not only will you save time and resin, but you'll also ensure a cleaner tool for your operations.  1. **Thorough Cleaning:** Ensure the hopper and feed throat areas are meticulously cleaned and devoid of remnants of previous resins or colors. A clean starting point is essential for a smooth transition. 2. **Pre-Flush Precaution:** Conduct a quick pre-flush using natural resin or regrind to remove the bulk of the residual resin or color. This step minimizes contamination and prepares the tool for the color change. 3. **Quality Purge Compound:** Opt for a high-quality[ chemical grade purge compound](https://www.asaclean.com/purging-products/chemical-purging-compounds) or a [concentrate grade](https://www.asaclean.com/purging-products/purge-concentrates) to blend with your resin. Products like [Asaclean Plus grade](https://www.asaclean.com/purging-products/plus-grade) or NCR grade are particularly effective, especially for high cavitational hot runner tools with more than 32 cavities. These compounds ensure thorough cleaning and prevent residue buildup during color transitions. 4. **Optimized Heat Settings:** Set the heat temperatures in the manifold within the range of 450-500°F (232-260°C) for optimal cleaning power. Higher temperatures enhance cleaning efficiency, effectively removing stubborn residues and carbon buildup. 5. **Adherence to Manufacturer Guidelines:** Strictly adhere to the manufacturer's instructions throughout the [color change](https://www.asaclean.com/solutions/color-changeovers) process. Following recommended procedures ensures safe and effective operation, minimizing the risk of issues such as color bleeding (which can lead to product defects) or mold damage (which can be costly to repair). If you have any inquiries regarding this application or need assistance with purge-related issues, feel free to contact me at [edespo@asaclean.com](mailto:edespo@asaclean.com). We're here to support your production needs and ensure seamless color changes in your manufacturing processes. Start implementing these tips today and see the difference in your color change process! **Ready to reduce your ****production downtime**** to protect your profits? Learn more about how ****purging compounds**** and process efficiency work in tandem.** ![Eric Despotovich](https://www.asaclean.com/hs-fs/hubfs/Eric%20Despotovich%20LinkedIn%20Headshot%202%20-%20Copy.jpg?width=150&name=Eric%20Despotovich%20LinkedIn%20Headshot%202%20-%20Copy.jpg) #### [ Eric Despotovich ](https://www.asaclean.com/blog/author/eric-despotovich) Eric Despotovich, an esteemed Asaclean Purging Expert and Technical Sales Representative, brings over 40 years of processing experience to his role. With over 18 years of dedication to our company, Eric has become a cornerstone of our sales team, renowned for his commitment to client success. His extensive industry knowledge and genuine passion for helping clients make him a trusted advisor in optimizing their operations. Eric's approach is characterized by deeply understanding each client's unique challenges, ensuring tailored solutions that drive efficiency and profitability. - [Share On LinkedIn ](https://www.linkedin.com/in/eric-despotovich-5449682b) ## Related Posts [![How to Prevent Splitting Hanger Dies for Color or Material Changes for Cast Film Extrusion](https://www.asaclean.com/hs-fs/hubfs/Avoid%20Die%20Teardowns%20Blog%20Header-1.jpg?width=450&height=250&name=Avoid%20Die%20Teardowns%20Blog%20Header-1.jpg) How to Avoid Splitting Hanger Dies in Cast Film Extrusion Troubleshooting / 3 min read / December 18, 2018 ](https://www.asaclean.com/blog/how-to-prevent-splitting-hangar-dies-for-color-or-material-changes-for-cast-film-extrusion) [![Cast Sheet Extrusion](https://www.asaclean.com/hs-fs/hubfs/Cast%20Sheet%20Extrusion.jpg?width=450&height=250&name=Cast%20Sheet%20Extrusion.jpg) 10 Tips to Remove Carbon From Hanger Dies in Cast Film Applications Troubleshooting / 3 min read / September 18, 2018 ](https://www.asaclean.com/blog/10-tips-to-remove-carbon-from-hanger-dies-in-cast-film-applications) ## Comments Get Started ## Ready to start improving your efficiency and increasing your profitability? - [Request a Consultation](https://www.asaclean.com/blog/caps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds#) - [Contact Sales](https://www.asaclean.com/blog/caps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds#) ![](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/caps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds#top) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Eric Despotovich", "url" : "https://www.asaclean.com/blog/author/eric-despotovich" }, "dateModified" : "2025-03-18T16:06:35.798Z", "datePublished" : "2024-04-16T13:15:00.000Z", "headline" : "5 Ways to Improve Color Changes in High-Cavitation Hot Runners", "image" : [ "https://www.asaclean.com/hubfs/Injection%20Molding-Hot%20Runner-Caps%20&%20Closures-Plus%20Grade-Packaging-Bottle%20Caps%201.jpg" ], "mainEntityOfPage" : { "@id" : "https://www.asaclean.com/blog/caps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds", "@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" : "", "author" : { "@type" : "Person", "name" : "Eric Despotovich" }, "datePublished" : "April 16, 2024", "headline" : "5 Ways to Improve Color Changes in High-Cavitation Hot Runners", "image" : "https://468726.fs1.hubspotusercontent-na1.net/hubfs/468726/Injection%20Molding-Hot%20Runner-Caps%20&%20Closures-Plus%20Grade-Packaging-Bottle%20Caps%201.jpg", "name" : "5 Ways to Improve Color Changes in High-Cavitation Hot Runners", "url" : "https://www.asaclean.com/blog/caps-and-closures-5-tips-for-a-quicker-color-change-for-high-cavitation-hot-runner-molds" } ```