{"id":12444,"date":"2026-05-11T14:40:20","date_gmt":"2026-05-11T12:40:20","guid":{"rendered":"https:\/\/ikv-aachen.de\/rp\/starch-foam-film\/"},"modified":"2026-05-19T14:49:13","modified_gmt":"2026-05-19T12:49:13","slug":"starch-foam-film","status":"publish","type":"cpt_ikv_rp","link":"https:\/\/ikv-aachen.de\/en\/rp\/starch-foam-film\/","title":{"rendered":"Starch foam film"},"content":{"rendered":"<style type=\"text\/css\">\n    #single-header-block_eb3681011aac3c3fd71c96cb44150579 .swiperThumbsNavi .swiper-slide {\n        opacity: 0.4;\n    }\n\n    #single-header-block_eb3681011aac3c3fd71c96cb44150579 .swiperThumbsNavi .swiper-slide-thumb-active {\n        opacity: 1;\n    }\n<\/style>\n    <section id=\"single-header-block_eb3681011aac3c3fd71c96cb44150579\" class=\"block-single-header theGridWrapper \">\n        <div class=\"theGrid12\">\n            <div class=\" col-start-2 col-span-10 md:col-start-3  md:col-span-8\">\n                <h2 class=\"font-serif font-semibold text-blue text-sm w-4\/5\">\n                    Einsatz physikalischer Treibmittel bei der Schaumextrusion st\u00e4rkebasierter Thermopaste                <\/h2>\n                                    <div class=\"mt-base text-blue text-sm font border-l-8  border-blue pl-base my-12 leading-normal \">\n                        Die Herstellung flexibler Schaumfolien aus thermoplastischer St\u00e4rke (TPS) als nachwachsendem Rohstoff ist aufgrund der geringen Schmelzefestigkeit und des engen Verarbeitungsfensters von TPS bisher kaum m\u00f6glich. Im Projekt St\u00e4rkeschaumfolie wurde daher der Einsatz von Treibmittelgemischen auf Basis von CO2 zur Erweiterung des Prozessfensters und damit zur Herstellung flexibler St\u00e4rkeschaumfolien geringer Dichte untersucht. Zun\u00e4chst wurden verarbeitbare St\u00e4rkeblends entwickelt, die zur Verbesserung der Schmelzefestigkeit und thermomechanischen Stabilit\u00e4t neben der plastifizierten St\u00e4rke auch Polybutylenadipat-Terephthalat (PBAT) enthielten. Diese Blends wurden durch Schaumextrusion mit physikalischen Treibmitteln zu Schaumstr\u00e4ngen sowie fl\u00e4chigen Schaumfolien verarbeitet und u. a. durch CT-Scans hinsichtlich ihrer Schaumstruktur analysiert.                     <\/div>\n                                            <\/div>\n        <\/div>\n    <\/section>\n\n<p class=\"wp-block-paragraph\">For<sub>CO2-foamed<\/sub> TPS strands, the influence of process-side setting parameters such as nozzle temperature and blowing agent content on the degree of expansion, foam density and cell size was evaluated. Under suitable conditions, expansion ratios of more than 3.5 and foam densities of around 0.34 kg\/m\u00b3 could be achieved. A foaming agent mixture based on<sub>CO2<\/sub> and ethanol was used to carry out the foam film tests. The use of ethanol as a co-propellant allows the processing window to be extended, as the solubility of the primary propellant CO<sub>2<\/sub>  within the plastic melt is increased by the co-expanding agent. This enables processing at lower process temperatures (nozzle temperature at 95 \u00b0C) and the realization of lower foam densities. With the use of 2.6 wt.% CO<sub>2<\/sub>  and 1.1% by weight ethanol, a flexible foam film with a foam density of 0.12 g\/cm\u00b3 and an average cell diameter of 0.24 mm could be realized. The project was thus able to successfully produce a flexible foam film based on thermoplastic starch using a physical blowing agent, which can be used industrially as a more sustainable foam packaging film, for example.<\/p>\n<figure class=\" relative flex flex-col gap-2xs mb-xs md:mb-l xl:mb-xl\"><img decoding=\"async\"  class=\" w-full  \"  src=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/2220NR291C.jpg\" srcset=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/2220NR291C-748x499.jpg 748w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/2220NR291C-1536x1024.jpg 1536w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/04\/2220NR291C-768x512.jpg 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" width=\"1536\" height=\"1024\" alt=\"2220NR291C\" loading=\"lazy\" \/><span class=\" text-copyright order-3 justify-end text-right w-full  w-full \">&copy; IKV<\/span><figcaption class=\" w-full  text-figcaption justify-end text-right \">Fig. 1: Starch can be used as a renewable raw material for the production of flexible foam films.<\/figcaption><\/figure>\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Project data and funding<\/summary>\n<p class=\"wp-block-paragraph\">We would like to thank the BMELH for funding the project (funding reference 2220NR291C) and the project partners for their cooperation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Project duration: 01.01.2023 &#8211; 31.12.2025<\/p>\n\n\n<section id=\"logo-bar-block_159bc439ac7bb1e833e3dbc301ec2238\" class=\"block-logo-bar py-2xl  clear-both\">\n    <div class=\"theGridWrapper overflow-hidden  \">\n        <div class=\"grid grid-cols-[repeat(auto-fill,minmax(140px,1fr))] gap-base\">\n                                                            <\/div>\n    <\/div>\n<\/section>\n<\/details>\n","protected":false},"excerpt":{"rendered":"<p>The production of flexible foam films from thermoplastic starch (TPS) as a renewable raw material has hardly been possible to date due to the low melt strength and narrow processing window of TPS. The starch foam film project therefore investigated the use of blowing agent mixtures based on CO2 to extend the process window and thus to produce flexible, low-density starch foam films.<\/p>\n","protected":false},"featured_media":12420,"parent":0,"template":"","tags":[1536,1535,879,1534,1538,1537],"research_fields":[840,856,817],"class_list":["post-12444","cpt_ikv_rp","type-cpt_ikv_rp","status-publish","has-post-thumbnail","hentry","tag-bio-based-plastics","tag-blowing-agent","tag-circular-economy","tag-foam-extrusion","tag-starch-blends","tag-thermoplastic-starch","research_fields-circular-economy","research_fields-extrusion-en","research_fields-materials-technology"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Starch foam film | IKV-Aachen<\/title>\n<meta name=\"description\" content=\"The production of flexible foam films from thermoplastic starch (TPS) as a renewable raw material has hardly been possible to date due to its low melt strength and narrow processing window. This project therefore investigated the use of blowing agent mixtures based on CO2 to extend the process window and thus to produce flexible, low-density starch foam films.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ikv-aachen.de\/en\/rp\/starch-foam-film\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Starch foam film | IKV-Aachen\" \/>\n<meta property=\"og:description\" content=\"The production of flexible foam films from thermoplastic starch (TPS) as a renewable raw material has hardly been possible to date due to its low melt strength and narrow processing window. 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