{"id":19415,"date":"2024-05-08T17:43:12","date_gmt":"2024-05-08T09:43:12","guid":{"rendered":"https:\/\/firstmold.com\/?p=19415"},"modified":"2026-01-21T14:04:10","modified_gmt":"2026-01-21T06:04:10","slug":"burn-marks","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pl\/tips\/burn-marks\/","title":{"rendered":"\u015alady oparze\u0144 w formowaniu wtryskowym tworzyw sztucznych"},"content":{"rendered":"

\u015alady po oparzeniach nie s\u0105 powszechne wada formowania wtryskowego<\/strong><\/a>. W rezultacie wielu praktyk\u00f3w z bran\u017cy form i form wtryskowych nie jest z nim zaznajomionych. Chocia\u017c \u015blady wypalania nie s\u0105 zwi\u0105zane ze struktur\u0105 produktu, FirstMold nadal wzywa projektant\u00f3w produkt\u00f3w, projektant\u00f3w konstrukcji i projektant\u00f3w mechanicznych do zapoznania si\u0119 z nimi.<\/p>\n\n\n\n

Je\u015bli jeste\u015b zainteresowany innymi wadami formowania wtryskowego, kliknij linki w poni\u017cszej tabeli, aby dowiedzie\u0107 si\u0119 wi\u0119cej.<\/p>\n\n\n\n

Poznaj r\u00f3\u017cne wady formowania wtryskowego<\/th><\/tr>
Flash<\/strong><\/a><\/td>Kr\u00f3tki strza\u0142<\/strong><\/a><\/td>Sink Mark<\/strong><\/a><\/td>Wypaczenie\/Deformacja<\/strong><\/a><\/td>Burn Mark<\/strong><\/td><\/tr>
Splay Mark\/Silver Streak<\/strong><\/a><\/td>Ciemny punkt\/czarna plamka<\/strong><\/a><\/td>Flow Mark<\/strong><\/a><\/td>Ba\u0144ka<\/strong><\/a><\/td>Weld Line<\/strong><\/a><\/td><\/tr>
R\u00f3\u017cnica kolor\u00f3w\/nier\u00f3wny kolor<\/strong><\/a><\/td>Znak sworznia wyrzutnika<\/a><\/strong><\/td><\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Czym s\u0105 \u015blady wypalenia w formowaniu wtryskowym?<\/h2>\n\n\n\n

\u015alady przypalenia odnosz\u0105 si\u0119 do ciemnych lub czarnych \u015blad\u00f3w powstaj\u0105cych na ko\u0144cu \u015bcie\u017cki przep\u0142ywu lub w obszarach uwi\u0119zionego gazu podczas procesu formowania wtryskowego z powodu s\u0142abego odpowietrzenia formy lub zbyt szybkiego wtrysku, gdy powietrze wewn\u0105trz formy nie ma czasu na ucieczk\u0119 i nagle nagrzewa si\u0119 pod wysokim ci\u015bnieniem (w skrajnych przypadkach temperatury mog\u0105 osi\u0105gn\u0105\u0107 nawet 3000 stopni). Przegrzane spr\u0119\u017cone powietrze spala stopiony materia\u0142.<\/p>\n\n\n\n

\"\u015alady
\u015alady przypalenia na \u017cebrze formowanej cz\u0119\u015bci z tworzywa sztucznego<\/figcaption><\/figure>\n\n\n\n

Czy \u015blady przypalenia maj\u0105 wp\u0142yw na produkt?<\/h3>\n\n\n\n

\u015alady przypalenia na cz\u0119\u015bciach formowanych wtryskowo mog\u0105 wp\u0142ywa\u0107 na wygl\u0105d i jako\u015b\u0107 produktu. Dotkni\u0119te obszary mog\u0105 wykazywa\u0107 r\u00f3\u017cne kolory i tekstury, takie jak czernienie, \u017c\u00f3\u0142kni\u0119cie lub szorstko\u015b\u0107, co mo\u017ce zmniejszy\u0107 estetyk\u0119 produktu; jak pokazano na poni\u017cszym obrazku, wygl\u0105d jest znacznie zmieniony po wyst\u0105pieniu \u015blad\u00f3w przypalenia;<\/p>\n\n\n\n

Wypalenia na cz\u0119\u015bciach formowanych wtryskowo mog\u0105 r\u00f3wnie\u017c wp\u0142ywa\u0107 na wydajno\u015b\u0107 i niezawodno\u015b\u0107 produktu. Uszkodzone obszary mog\u0105 zmienia\u0107 w\u0142a\u015bciwo\u015bci fizyczne i chemiczne cz\u0119\u015bci formowanych wtryskowo, takie jak zmniejszenie ich wytrzyma\u0142o\u015bci, odporno\u015bci na ciep\u0142o lub korozj\u0119, co mo\u017ce wp\u0142ywa\u0107 na u\u017cyteczno\u015b\u0107 produktu;<\/p>\n\n\n\n

Wypalenia na cz\u0119\u015bciach formowanych wtryskowo mog\u0105 r\u00f3wnie\u017c wp\u0142ywa\u0107 na wydajno\u015b\u0107 produkcji i kontrol\u0119 koszt\u00f3w; problemy z wypaleniami mog\u0105 prowadzi\u0107 do z\u0142omowania lub ponownej obr\u00f3bki cz\u0119\u015bci formowanych wtryskowo, zwi\u0119kszaj\u0105c koszty produkcji.<\/p>\n\n\n\n

Przyczyny powstawania \u015blad\u00f3w po oparzeniach <\/h2>\n\n\n\n

4. Wp\u0142yw surowc\u00f3w <\/h3>\n\n\n\n

a) Wysoka zawarto\u015b\u0107 wilgoci i substancji lotnych w surowcach.<\/p>\n\n\n\n

b) Wysoki wska\u017anik topnienia, dobra p\u0142ynno\u015b\u0107 stopu, utrudniaj\u0105ca wydalanie gaz\u00f3w.<\/p>\n\n\n\n

c) Dodatki z tworzyw sztucznych, barwniki zawieraj\u0105ce substancje lotne i wilgo\u0107, nieodporne na wysokie temperatury powoduj\u0105ce rozk\u0142ad.<\/p>\n\n\n\n

\u015arodki poprawy w przypadku \u015blad\u00f3w po oparzeniach<\/h2>\n\n\n\n

1. Podczas pustych zastrzyk\u00f3w pojawiaj\u0105 si\u0119 \u015blady oparze\u0144 <\/h3>\n\n\n\n

a) Sprawd\u017a, czy dysza nie jest zatkana. <\/p>\n\n\n\n

b) Sprawd\u017a, czy \u015bruba, pier\u015bcie\u0144 kontrolny, b\u0119benek itp. nie s\u0105 uszkodzone. <\/p>\n\n\n\n

c) Sprawd\u017a system grzewczy, przewody czujnik\u00f3w temperatury, termopary, pier\u015bcienie grzewcze i ustawienia temperatury plastyfikacji pod k\u0105tem nieprawid\u0142owo\u015bci. <\/p>\n\n\n\n

d) Sprawdzi\u0107, czy surowiec, proszek barwi\u0105cy, koncentrat itp. nie zawieraj\u0105 \u0142atwo rozk\u0142adaj\u0105cych si\u0119 substancji i rozwa\u017cy\u0107 zast\u0105pienie ich innymi materia\u0142ami w celu wyeliminowania tego problemu. <\/p>\n\n\n\n

e) Sprawdzi\u0107, czy przeciwci\u015bnienie nie jest zbyt wysokie, pr\u0119dko\u015b\u0107 obrotu zasobnika nie jest zbyt wysoka lub czas wst\u0119pnej plastyfikacji nie jest zbyt d\u0142ugi, powoduj\u0105c rozk\u0142ad surowca i karbonizacj\u0119. <\/p>\n\n\n\n

2. \u015alady przypalenia w formie <\/h3>\n\n\n\n

a) Dla formy gor\u0105cokana\u0142owe<\/strong><\/a>, sprawdzi\u0107, czy gor\u0105cy kana\u0142 i regulator temperatury nie wykazuj\u0105 nieprawid\u0142owo\u015bci.<\/p>\n\n\n\n

b) W przypadku form zimnokana\u0142owych nale\u017cy sprawdzi\u0107 kana\u0142 i bram\u0119 pod k\u0105tem uszkodze\u0144 itp. <\/p>\n\n\n\n

3. \u015alady przypalenia na produkcie <\/h3>\n\n\n\n

a) Je\u015bli na kraw\u0119dziach produktu pojawi\u0105 si\u0119 \u015blady przypalenia, nale\u017cy rozwa\u017cy\u0107 zwi\u0119kszenie wentylacji i zmniejszenie pr\u0119dko\u015bci wtrysku. <\/p>\n\n\n\n

b) Je\u015bli \u015blady przypalenia wyst\u0119puj\u0105 w \u015brodku produktu, nale\u017cy rozwa\u017cy\u0107 zmian\u0119 wk\u0142adu wylotowego lub dodanie sworznia wyrzutnika wylotowego i zastosowa\u0107 wtrysk segmentowy w procesie, zmniejszaj\u0105c pr\u0119dko\u015b\u0107 wtrysku w miejscu \u015bladu przypalenia.<\/p>\n\n\n\n

c) Je\u015bli na ko\u0144cu produktu pojawi\u0105 si\u0119 \u015blady przypalenia, zalecamy wyczyszczenie rowk\u00f3w odpowietrzaj\u0105cych formy i zmniejszenie si\u0142y zacisku.<\/p>\n\n\n\n

Analiza przypadku \u015blad\u00f3w poparze\u0144<\/h2>\n\n\n\n
\"Obraz
Obraz przypadku \u015blad\u00f3w przypalenia produktu<\/figcaption><\/figure>\n\n\n\n

Wprowadzenie do produktu<\/h3>\n\n\n\n

Powy\u017cszy obraz przedstawia przypadek wypalenia produktu. Prawy obraz jest zbli\u017ceniem lewego obrazu.<\/p>\n\n\n\n

Materia\u0142 produktu to PBT, rodzaj z\u0142\u0105cza o grubych \u015bciankach i powierzchni o drugorz\u0119dnym wygl\u0105dzie. Ze wzgl\u0119du na wymagania klienta dotycz\u0105ce wysokiej jako\u015bci, zauwa\u017calne wady powierzchni produktu s\u0105 niedopuszczalne.<\/p>\n\n\n\n

Warunki formowania s\u0105 nast\u0119puj\u0105ce.<\/p>\n\n\n\n

a. Temperatura formowania: 60 ~ 80 \u2103.<\/p>\n\n\n\n

b. Temperatura materia\u0142u: 240 ~ 260 \u2103.<\/p>\n\n\n\n

c. Pr\u0119dko\u015b\u0107 wtrysku w trzech etapach: pierwszy etap 180 mm\/s, drugi etap 135 mm\/s, trzeci etap 40 mm\/s.<\/p>\n\n\n\n

d. Czas wtrysku: 1,5\uff5e3 s.<\/p>\n\n\n\n

e. Ci\u015bnienie wtrysku: 1300 ~ 1500 kgf\/cm\u00b2.<\/p>\n\n\n\n

Problemy z produktem<\/h3>\n\n\n\n

Na zdj\u0119ciu produktu widoczne s\u0105 niewielkie \u015blady przypalenia wewn\u0105trz czerwonego okr\u0119gu, kt\u00f3rych klient nie akceptuje.<\/p>\n\n\n\n

Przyczyny i strategie<\/h3>\n\n\n\n

(1) Analiza przyczyn<\/strong><\/p>\n\n\n\n

Podczas pocz\u0105tkowego pr\u00f3ba ple\u015bni<\/strong><\/a>Przeprowadzono analiz\u0119 szablonu przep\u0142ywu, kt\u00f3ra wykaza\u0142a, \u017ce lokalizacja \u015blad\u00f3w wypalenia na ko\u0144cowej linii wtopienia produktu by\u0142a g\u0142\u00f3wnie spowodowana tym, \u017ce gazy nie mog\u0142y wydosta\u0107 si\u0119 z zaznaczonego miejsca w gnie\u017adzie formy, powoduj\u0105c uwi\u0119zione \u015blady wypalenia gazu.<\/p>\n\n\n\n

(2) Strategie rozwi\u0105za\u0144<\/strong><\/p>\n\n\n\n

Poniewa\u017c produkt i struktura formy zosta\u0142y ju\u017c potwierdzone przez klienta i nie mo\u017cna ich zmieni\u0107, problem mo\u017cna rozwi\u0105za\u0107 jedynie poprzez dostosowanie proces\u00f3w odpowietrzania formy i formowania wtryskowego.<\/p>\n\n\n\n

Rozszerz szczeliny wentylacyjne w \u015bcie\u017cce przep\u0142ywu formy, powierzchni podzia\u0142u formy i ko\u0142kach wypychacza tak bardzo, jak to mo\u017cliwe, zmniejszaj\u0105c ilo\u015b\u0107 ko\u0144cowego odpowietrzenia, aby z\u0142agodzi\u0107 dotkliwo\u015b\u0107 \u015blad\u00f3w przypalenia.<\/p>\n\n\n\n

Dostosowa\u0107 proces formowania wtryskowego do wtrysku wieloetapowego. Ze wzgl\u0119du na grubo\u015b\u0107 produktu, podczas dw\u00f3ch ostatnich etap\u00f3w wtrysku nale\u017cy stosowa\u0107 niskie lub nawet ni\u017csze pr\u0119dko\u015bci, aby zmniejszy\u0107 nasilenie \u015blad\u00f3w wypalenia.<\/p>\n\n\n\n

S\u0142owa ko\u0144cowe<\/h2>\n\n\n\n

Jestem Lee Young z FirstMold, pracuj\u0119 sumiennie ka\u017cdego dnia. Opieraj\u0105c si\u0119 na ksi\u0105\u017ckach, podr\u0119cznikach i praktycznym do\u015bwiadczeniu warsztatowym, podsumowa\u0142em wiele zestaw\u00f3w do\u015bwiadcze\u0144 zawodowych w celu \u0142atwego odniesienia i nauki. Dla tych, kt\u00f3rzy ucz\u0105 si\u0119 o formowaniu wtryskowym, formach, projektowaniu strukturalnym produktu i projektowaniu form, wa\u017cne jest, aby czyta\u0107, \u0107wiczy\u0107 i pr\u00f3bowa\u0107 wi\u0119cej, i nie ba\u0107 si\u0119 pora\u017cki. Mam nadziej\u0119, \u017ce moje do\u015bwiadczenie b\u0119dzie pomocne.<\/p>","protected":false},"excerpt":{"rendered":"

Zrozumienie \u015blad\u00f3w wypalenia w formowaniu wtryskowym, zidentyfikowanie ich przyczyn, znalezienie rozwi\u0105za\u0144 i opanowanie ich poprzez proste studium przypadku.<\/p>","protected":false},"author":5,"featured_media":19419,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[48],"tags":[51,63],"class_list":["post-19415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","tag-injection-molding","tag-injection-molding-defects"],"acf":[],"yoast_head":"\nBurn Marks In Injection Molding<\/title>\n<meta name=\"description\" content=\"Understand burn marks in injection molding, identify their causes, find solutions, and master them through a simple case study.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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