{"id":19645,"date":"2024-05-15T16:28:59","date_gmt":"2024-05-15T08:28:59","guid":{"rendered":"https:\/\/firstmold.com\/?p=19645"},"modified":"2025-07-15T13:33:06","modified_gmt":"2025-07-15T05:33:06","slug":"holding-pressure-and-holding-time","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pl\/guides\/holding-pressure-and-holding-time\/","title":{"rendered":"Jak okre\u015bli\u0107 ci\u015bnienie i czas utrzymywania w formowaniu wtryskowym?"},"content":{"rendered":"<p>W <a href=\"https:\/\/firstmold.com\/pl\/guides\/what-is-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Proces formowania wtryskowego<\/strong><\/a>Cz\u0119sto spotykamy si\u0119 z trzema parametrami zwi\u0105zanymi z ci\u015bnieniem: ci\u015bnieniem wtrysku, ci\u015bnieniem podtrzymania i ci\u015bnieniem wstecznym. Szczeg\u00f3\u0142owo om\u00f3wili\u015bmy ci\u015bnienie wtrysku w artykule \"<a href=\"https:\/\/firstmold.com\/pl\/guides\/injection-speed-and-injection-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Ci\u015bnienie wtrysku i pr\u0119dko\u015b\u0107 wtrysku<\/strong><\/a>\". Dzisiaj skoncentrujemy si\u0119 na zrozumieniu ci\u015bnienia trzymania.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-are-holding-pressure-and-holding-time\">Czym s\u0105 ci\u015bnienie trzymania i czas trzymania?<\/h2>\n\n\n\n<p>Wszyscy wiemy, \u017ce ci\u015bnienie s\u0142u\u017cy do pokonywania opor\u00f3w przep\u0142ywu i manifestowania pr\u0119dko\u015bci. Og\u00f3lnie rzecz bior\u0105c, ci\u015bnienie wtrysku obejmuje zar\u00f3wno ci\u015bnienie, jak i pr\u0119dko\u015b\u0107, podczas gdy ci\u015bnienie utrzymywania obejmuje tylko ci\u015bnienie, a nie pr\u0119dko\u015b\u0107. Ci\u015bnienie wtrysku odnosi si\u0119 do ci\u015bnienia i pr\u0119dko\u015bci stosowanych do wype\u0142nienia gniazda formy stopionym materia\u0142em do 95% jego obj\u0119to\u015bci, po czym prze\u0142\u0105cza si\u0119 na ci\u015bnienie utrzymywania. Ci\u015bnienie wtrysku zazwyczaj przechodzi z wysokoci\u015bnieniowej pr\u0119dko\u015bci wolnej do wysokoci\u015bnieniowej pr\u0119dko\u015bci szybkiej, a nast\u0119pnie do niskoci\u015bnieniowej pr\u0119dko\u015bci wolnej przed prze\u0142\u0105czeniem na ci\u015bnienie utrzymywania.<\/p>\n\n\n\n<p>Ci\u015bnienie utrzymuj\u0105ce jest stosowane po tym, jak stopiony materia\u0142 wype\u0142ni gniazdo formy, aby zapobiec pustkom spowodowanym przez <a href=\"https:\/\/firstmold.com\/pl\/guides\/plastic-shrinkage\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>skurcz krzepni\u0119cia<\/strong><\/a> lub s\u0142abych punkt\u00f3w w pozycji bramy, zapewniaj\u0105c w ten spos\u00f3b wystarczaj\u0105c\u0105 wytrzyma\u0142o\u015b\u0107 cz\u0119\u015bci. Zwykle przechodzi z wysokoci\u015bnieniowej niskiej pr\u0119dko\u015bci (czas okre\u015blony przez grubo\u015b\u0107 produktu) do niskoci\u015bnieniowej niskiej pr\u0119dko\u015bci przed przej\u015bciem do przechowywania materia\u0142u.<\/p>\n\n\n\n<p>Ci\u015bnienie trzymania oznacza, \u017ce \u015blimak nie cofa si\u0119 natychmiast po wtrysku, ale nadal wywiera nacisk na stopiony materia\u0142 na przednim ko\u0144cu. Podczas fazy przytrzymywania tworzywo sztuczne w gnie\u017adzie formy kurczy si\u0119 z powodu ch\u0142odzenia, a je\u015bli brama nie jest zamarzni\u0119ta, \u015blimak powoli przesuwa si\u0119 pod ci\u015bnieniem przytrzymuj\u0105cym, umo\u017cliwiaj\u0105c wtryskiwanie wi\u0119kszej ilo\u015bci tworzywa sztucznego do gniazda w celu skompensowania skurczu. Og\u00f3lnie rzecz bior\u0105c, ci\u015bnienie przytrzymuj\u0105ce jest mniejsze ni\u017c ci\u015bnienie wtrysku.<\/p>\n\n\n\n<p>Czas utrzymywania to czas, kt\u00f3ry zapewnia ca\u0142kowite zamro\u017cenie bramki produktu, zapobiegaj\u0105c przep\u0142ywowi wstecznemu. Je\u015bli czas ten jest zbyt kr\u00f3tki, w pobli\u017cu bramki mog\u0105 powsta\u0107 wgniecenia skurczowe. Je\u015bli jest zbyt d\u0142ugi, mo\u017ce powodowa\u0107 nadmierne napr\u0119\u017cenia wewn\u0119trzne i wypuk\u0142o\u015b\u0107 bramki. Okre\u015blenie, czy bramka jest zamro\u017cona, mo\u017cna wykona\u0107 za pomoc\u0105 metody pomiaru masy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-transition-point\">Punkt przej\u015bcia<\/h3>\n\n\n\n<p>Kluczowym poj\u0119ciem jest tutaj punkt przej\u015bcia. Og\u00f3lnie rzecz bior\u0105c, punkt przej\u015bcia ma miejsce, gdy produkt jest nape\u0142niany 95% pod zerowym ci\u015bnieniem utrzymywania, prze\u0142\u0105czaj\u0105c si\u0119 z wtrysku na utrzymywanie. W przypadku produkt\u00f3w cienko\u015bciennych jest to zazwyczaj 98%. W przypadku niezr\u00f3wnowa\u017conych kana\u0142\u00f3w jest to zazwyczaj 70%-80%, w zale\u017cno\u015bci od konkretnej sytuacji. Zalecany jest wtrysk wielostopniowy z pr\u0119dko\u015bciami powolny-szybki-wolny.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-impact-of-holding-pressure-and-holding-time-on-injection-molded-parts\">Wp\u0142yw ci\u015bnienia i czasu utrzymywania na cz\u0119\u015bci formowane wtryskowo<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-impact-of-holding-pressure\">Wp\u0142yw ci\u015bnienia trzymania:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Za nisko:<\/strong> Wyniki w <a href=\"https:\/\/firstmold.com\/pl\/tips\/short-shot-in-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>kr\u00f3tkie uj\u0119cia<\/strong><\/a>, <a href=\"https:\/\/firstmold.com\/pl\/tips\/sink-marks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>znaki zlewu<\/strong><\/a>, <a href=\"https:\/\/firstmold.com\/pl\/tips\/weld-lines\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>linie spawania<\/strong><\/a>itp. Niewystarczaj\u0105ce ci\u015bnienie utrzymuj\u0105ce prowadzi do niewystarczaj\u0105cej kompresji stopionego tworzywa sztucznego we wn\u0119ce formy, co skutkuje ni\u017csz\u0105 g\u0119sto\u015bci\u0105 i wi\u0119kszym skurczem po sch\u0142odzeniu, powoduj\u0105c, \u017ce ko\u0144cowa obj\u0119to\u015b\u0107 jest mniejsza ni\u017c obj\u0119to\u015b\u0107 wn\u0119ki formy.<\/li>\n\n\n\n<li><strong>Za wysoko:<\/strong> Powoduje wypaczenia, wyp\u0142ywki i ci\u0119\u017ckie przypadki rozszerzania si\u0119 formy. Nadmiar stopionego tworzywa sztucznego \u015bciska si\u0119 w gnie\u017adzie formy, a skurcz ch\u0142odz\u0105cy nie kompensuje odpowiednio, co prowadzi do napr\u0119\u017ce\u0144 szcz\u0105tkowych. W przypadku cz\u0119\u015bci precyzyjnych i wymagaj\u0105cych galwanizacji nale\u017cy unika\u0107 takiej sytuacji.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"439\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Adjustment-of-Holding-Pressure.webp\" alt=\"Regulacja ci\u015bnienia trzymania\" class=\"wp-image-19647\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Adjustment-of-Holding-Pressure.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Adjustment-of-Holding-Pressure-300x132.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Adjustment-of-Holding-Pressure-768x337.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Adjustment-of-Holding-Pressure-18x8.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Regulacja ci\u015bnienia trzymania<\/figcaption><\/figure>\n\n\n\n<p>Optymalne ci\u015bnienie trzymania to takie, kt\u00f3re pozwala unikn\u0105\u0107 <a href=\"https:\/\/firstmold.com\/pl\/tips\/short-shot-in-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>kr\u00f3tkie uj\u0119cia<\/strong><\/a> oraz <a href=\"https:\/\/firstmold.com\/pl\/tips\/sink-marks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>znak zlewu<\/strong><\/a> wady, jednocze\u015bnie eliminuj\u0105c napr\u0119\u017cenia szcz\u0105tkowe. Innymi s\u0142owy, tworzywo sztuczne \u015bci\u015bni\u0119te w gnie\u017adzie formy tworzy wysokie ci\u015bnienie w gnie\u017adzie, kt\u00f3re rozprasza si\u0119 po ca\u0142kowitym sch\u0142odzeniu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-impact-of-holding-time\">Wp\u0142yw czasu wstrzymania:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Za d\u0142ugo:<\/strong> Wp\u0142ywa na czas cyklu.<\/li>\n\n\n\n<li><strong>Za kr\u00f3tko:<\/strong> Skutkuje to niewystarczaj\u0105c\u0105 wag\u0105, wewn\u0119trznymi pustkami i mniejszymi wymiarami.<\/li>\n<\/ul>\n\n\n\n<p>Uwaga: Ci\u015bnienie trzymania wp\u0142ywa na czas trzymania. Im wy\u017csze ci\u015bnienie trzymania, tym d\u0142u\u017cszy czas trzymania.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-setting-holding-pressure-and-holding-time\">Ustawianie ci\u015bnienia trzymania i czasu trzymania<\/h2>\n\n\n\n<p>Ci\u015bnienie trzymania jest zazwyczaj ustawiane pomi\u0119dzy minimalnym i maksymalnym ci\u015bnieniem trzymania, zazwyczaj od niskiego do wysokiego.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Minimalne ci\u015bnienie trzymania:<\/strong> W oparciu o dok\u0142adny punkt przej\u015bcia, zapewnia wystarczaj\u0105ce ci\u015bnienie trzymania, aby unikn\u0105\u0107 niedope\u0142nienia.<\/li>\n\n\n\n<li><strong>Maksymalne ci\u015bnienie trzymania:<\/strong> W oparciu o dok\u0142adny punkt przej\u015bcia, zapewnia on utrzymanie ci\u015bnienia tu\u017c przed wyst\u0105pieniem flashowania. Zakres ten wskazuje bezpieczne okno przetwarzania produktu.<\/li>\n<\/ul>\n\n\n\n<p>Og\u00f3lnie rzecz bior\u0105c:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ci\u015bnienie utrzymywania PA = 50% ci\u015bnienia wtrysku<\/li>\n\n\n\n<li><a href=\"https:\/\/firstmold.com\/pl\/guides\/pom-plastic\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>POM<\/strong><\/a> Ci\u015bnienie trzymania = 80% ci\u015bnienia wtrysku (mo\u017ce wynosi\u0107 100% dla wysokiej dok\u0142adno\u015bci wymiarowej)<\/li>\n\n\n\n<li>Ci\u015bnienie trzymania PP\/PE = 30-50% ci\u015bnienia wtrysku<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-classic-steps-for-setting-holding-time\">Klasyczne kroki ustawiania czasu wstrzymania:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ustaw temperatur\u0119 topnienia na \u015brodkowy zakres warto\u015bci zalecanych przez producenta.<\/li>\n\n\n\n<li>Ustaw pr\u0119dko\u015b\u0107 wtrysku, punkt przej\u015bcia i czas ch\u0142odzenia na bezpieczne warto\u015bci.<\/li>\n\n\n\n<li>Ustaw ci\u015bnienie trzymania (patrz kroki powy\u017cej).<\/li>\n\n\n\n<li>Ustaw r\u00f3\u017cne czasy utrzymywania, zwracaj\u0105c uwag\u0119, \u017ce wyd\u0142u\u017cenie czasu utrzymywania skraca czas ch\u0142odzenia, utrzymuj\u0105c ten sam cykl. Zwa\u017c cz\u0119\u015bci w r\u00f3\u017cnych warunkach przetrzymywania, wprowad\u017a dane do arkusza Excel i wykre\u015bl krzyw\u0105 zale\u017cno\u015bci masy od ci\u015bnienia przetrzymywania.<\/li>\n\n\n\n<li>Okre\u015bli\u0107 zakres czasu, w kt\u00f3rym masa cz\u0119\u015bci nie zmienia si\u0119 znacz\u0105co. Czas tu\u017c przed tym zakresem to czas uszczelnienia bramki. Zazwyczaj nale\u017cy ustawi\u0107 czas przytrzymania o 0,5-2 sekundy d\u0142u\u017cszy ni\u017c czas uszczelnienia bramki.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>Zrozumienie parametr\u00f3w ci\u015bnienia trzymania i czasu trzymania w formowaniu wtryskowym oraz nauczenie si\u0119, jak ustawi\u0107 je naukowo.<\/p>","protected":false},"author":5,"featured_media":19648,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[47],"tags":[51],"class_list":["post-19645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides","tag-injection-molding"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Holding Pressure and Holding Time In Injection Molding<\/title>\n<meta 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