{"id":2340,"date":"2026-07-04T17:16:50","date_gmt":"2026-07-04T17:16:50","guid":{"rendered":"https:\/\/www.fhysilicone.com\/?p=2340"},"modified":"2026-07-04T17:16:54","modified_gmt":"2026-07-04T17:16:54","slug":"lsr-overmolding-in-medical-devices","status":"publish","type":"post","link":"https:\/\/www.fhysilicone.com\/nl\/lsr-overmolding-in-medical-devices\/","title":{"rendered":"LSR-overmolding in medische hulpmiddelen: wat ingenieurs moeten weten"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Inleiding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Het omspuiten met vloeibaar siliconenrubber (LSR) is uitgegroeid tot een van de belangrijkste productietechnologie\u00ebn in de moderne medische apparatuurindustrie. Deze techniek maakt het mogelijk om <strong>harde ondergronden (kunststof of metaal)<\/strong> met <strong>zachte siliconen afdichtings- of functionele lagen<\/strong>, waarbij componenten worden vervaardigd die voldoen aan strenge eisen op het gebied van biocompatibiliteit, afdichtingsprestaties en duurzaamheid op lange termijn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Toepassingen zijn onder meer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Katheterkoppelingen<\/li>\n\n\n\n<li>Afdichtingsmembranen<\/li>\n\n\n\n<li>Aansluitingen voor ademhalingsapparatuur<\/li>\n\n\n\n<li>Systemen voor de toediening van geneesmiddelen<\/li>\n\n\n\n<li>Onderdelen van chirurgische instrumenten<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Voor ingenieurs is kennis van LSR-overmolding van essentieel belang voor het ontwerpen van betrouwbare, schaalbare medische hulpmiddelen.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know-1024x819.png\" alt=\"\" class=\"wp-image-2341\" srcset=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know-1024x819.png 1024w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know-300x240.png 300w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know-768x615.png 768w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know-15x12.png 15w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know-600x480.png 600w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/LSR-Overmolding-in-Medical-Devices-What-Engineers-Need-to-Know.png 1402w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. Wat is LSR-overmolding?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LSR-overmolding is een productieproces waarbij <strong>vloeibaar siliconenrubber wordt op een voorgevormd substraat gespoten<\/strong> zoals:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Polycarbonaat (PC)<\/li>\n\n\n\n<li>Polyamide (PA)<\/li>\n\n\n\n<li>PEEK<\/li>\n\n\n\n<li>Roestvrij staal<\/li>\n\n\n\n<li>Aluminiumlegeringen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Na het uitharden hecht de siliconen zich onlosmakelijk aan de ondergrond, waardoor een <strong>\u00e9\u00e9n ge\u00efntegreerde functionele component<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Waarom LSR ideaal is voor medische hulpmiddelen<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LSR biedt unieke voordelen ten opzichte van traditionele elastomeren:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 Hoge biocompatibiliteit<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Geschikt voor contact met de huid en voor inwendig medisch gebruik<\/li>\n\n\n\n<li>Voldoet aan ISO 10993 en USP Klasse VI<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 Uitstekende thermische stabiliteit<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bestand tegen temperaturen van -50 \u00b0C tot 200 \u00b0C<\/li>\n\n\n\n<li>Geschikt voor sterilisatie in een autoclaaf<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.3 Chemische bestendigheid<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bestand tegen desinfectiemiddelen en lichaamsvloeistoffen<\/li>\n\n\n\n<li>Lage hoeveelheden extraheerbare en uitloogbare stoffen<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.4 Mogelijkheden op het gebied van precisiegieten<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Geschikt voor medische onderdelen op microschaal<\/li>\n\n\n\n<li>Hoge herhaalbaarheid bij massaproductie<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">4. Belangrijke overwegingen bij het technisch ontwerp<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 Materiaalverenigbaarheid<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Niet alle kunststoffen hechten goed aan LSR. Ingenieurs moeten rekening houden met het volgende:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oppervlakte-energie van het substraat<\/li>\n\n\n\n<li>Gebruik van primers of plasmabehandeling<\/li>\n\n\n\n<li>Verschil in thermische uitzetting<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 Hechtingsmechanisme<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">LSR-hechting vindt plaats via:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chemische binding (voorkeur)<\/li>\n\n\n\n<li>Mechanische vergrendeling (secundaire constructie)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Een sterke hechting is van cruciaal belang om delaminatie in medische omgevingen te voorkomen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.3 Controle van de wanddikte<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Een gelijkmatige siliconenlaagdikte zorgt ervoor dat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stabiel uithardingsgedrag<\/li>\n\n\n\n<li>Minder variatie in krimp<\/li>\n\n\n\n<li>Constante afdichtingsprestaties<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Typische wanddikte van medisch LSR: <strong>0,3 mm \u2013 3,0 mm<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.4 Complexiteit van het matrijsontwerp<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Voor LSR-overmoldingmatrijzen is het volgende vereist:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Precisie-uitlijningssystemen<\/li>\n\n\n\n<li>Ontluchting voor het afvoeren van lucht<\/li>\n\n\n\n<li>Kamers met temperatuurregeling<\/li>\n\n\n\n<li>Mogelijkheid tot meervoudige injectie<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5. Overzicht van het productieproces<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Stap 1: Voorbereiding van de ondergrond<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spuitgegoten kunststof of machinaal bewerkt metalen onderdeel<\/li>\n\n\n\n<li>Reiniging en oppervlaktebehandeling<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Stap 2: LSR-injectie<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vloeibare siliconen die in de vormholte worden ge\u00efnjecteerd<\/li>\n\n\n\n<li>Geregelde temperatuur en druk<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Stap 3: Uithardingsproces<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Door warmte geactiveerde verknoping<\/li>\n\n\n\n<li>Korte cyclustijd (doorgaans 30\u201390 seconden)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Stap 4: Nabehandeling (indien nodig)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verwijdert vluchtige stoffen<\/li>\n\n\n\n<li>Verbetert de therapietrouw<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Stap 5: Inspectie en testen<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maatnauwkeurigheid<\/li>\n\n\n\n<li>Testen van de hechtingssterkte<\/li>\n\n\n\n<li>Lek- en druktests<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">6. Veelvoorkomende uitdagingen bij het overmallen van medische LSR-producten<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">6.1 Problemen met delaminatie<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Veroorzaakt door:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slechte oppervlaktebehandeling<\/li>\n\n\n\n<li>Onverenigbare substraatmaterialen<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6.2 Defecten bij het knipperen<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slechte afdichting van de mal<\/li>\n\n\n\n<li>Te hoge injectiedruk<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6.3 Wisselende hechtsterkte<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verschillen in de chemische samenstelling van het oppervlak<\/li>\n\n\n\n<li>Verontreiniging tijdens het gieten<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">7. Toepassingen in medische hulpmiddelen<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LSR-overmolding wordt op grote schaal toegepast in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Systemen voor de toediening van geneesmiddelen<\/li>\n\n\n\n<li>Infusiepompen<\/li>\n\n\n\n<li>Ademhalingsmaskers en aansluitingen<\/li>\n\n\n\n<li>Handgrepen voor chirurgische instrumenten<\/li>\n\n\n\n<li>Afdichtingssystemen voor katheters<\/li>\n\n\n\n<li>Interfaces voor diagnostische apparatuur<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">8. Toekomstige trends<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">De medische LSR-sector ontwikkelt zich in de richting van:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Micro-precisie-overmolding (structuren van minder dan 100 \u03bcm)<\/li>\n\n\n\n<li>Integratie van verschillende materialen (siliconen + elektronica)<\/li>\n\n\n\n<li>Slimme interfaces voor medische apparatuur<\/li>\n\n\n\n<li>Volledig geautomatiseerde productielijnen voor cleanrooms<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">9. Conclusie<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LSR-overmolding is een cruciale basistechnologie bij de productie van moderne medische hulpmiddelen. Ingenieurs moeten zorgvuldig rekening houden met <strong>materiaalcompatibiliteit, matrijsontwerp, hechtingsmechanismen en naleving van regelgeving<\/strong> om te zorgen voor hoogwaardige en veilige medische componenten.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gezien de toenemende vraag naar minimaal invasieve en uiterst betrouwbare apparaten zal LSR-overmolding ook in de toekomst een centrale rol blijven spelen in de medische techniek.<\/p>","protected":false},"excerpt":{"rendered":"<p>1. Introduction Liquid Silicone Rubber (LSR) overmolding has become one of the most important manufacturing technologies in modern medical device engineering. It enables the combination of rigid substrates (plastic or metal) with soft silicone sealing or functional layers, creating components that meet strict requirements for biocompatibility, sealing performance, and long-term durability. Applications include: For engineers, 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