{"id":107,"date":"2024-03-04T21:09:07","date_gmt":"2024-03-04T20:09:07","guid":{"rendered":"https:\/\/www.3dprint-italia.it\/WP\/2024\/03\/04\/il-petg-cose\/"},"modified":"2024-05-25T06:45:41","modified_gmt":"2024-05-25T05:45:41","slug":"il-petg-cose","status":"publish","type":"post","link":"https:\/\/www.3dprint-italia.it\/WP\/2024\/03\/04\/il-petg-cose\/","title":{"rendered":"IL PETG !!! COS’E’ ???"},"content":{"rendered":"
Questa sera ho cercato un po’ di documentazione in rete per preparare un semplice articolo riguardo a questo polimero, molto diffuso nel mondo della stampa 3D.<\/span><\/div>\n
<\/div>\n
Partiamo…<\/i><\/span><\/div>\n
<\/div>\n
Il PETG \u00e8 un filamento molto utilizzato per la sua buona\u00a0resistenza<\/strong>\u00a0e relativa\u00a0flessibilit\u00e0<\/strong>\u00a0e resistenza alla\u00a0temperatura<\/b>, rispetto al pi\u00f9 comune PLA.<\/span><\/div>\n
Il PETG \u00e8 noto per essere il giusto compromesso tra PLA e ABS.<\/span><\/div>\n
Resistente quasi come l’ABS ma pi\u00f9 flessibile, con un processo di stampa molto simile al PLA (non serve camera chiusa), adatto per il contatto con cibi e bevande.<\/span><\/div>\n
<\/div>\n
Ma… non pu\u00f2 sostituire n\u00e9 il PLA n\u00e9 l’ABS.<\/span><\/div>\n
Come detto sopra, \u00e8 un OTTIMO compromesso, perfetto per stampe funzionali che necessitano un po’ pi\u00f9 di forza strutturale, che il PLA non \u00e8 in grado di di dare. E per questo \u00e8 diventato il secondo filamento pi\u00f9 utilizzato dopo il PLA.<\/span><\/div>\n
<\/div>\n
MA COS’\u00c8 ESATTAMENTE IL PETG?<\/span><\/h5>\n
Per prima cosa il PETG ha tanto in comune con il PET delle bottiglie d’acqua di plastica… ma non sono la stessa cosa.<\/span><\/div>\n
PETG: polietilene tereftalato modificato con glicole.<\/b><\/span><\/div>\n
Cio\u00e8, durante la creazione della catena polimerica, sono aggiunte molecole di glicole che “addolciscono” i comportamenti del PET, semplificandone l’utilizzo (principalmente semplificando i processi di lavorazione) e migliorandone alcune caratteristiche.<\/span><\/div>\n
<\/div>\n
\n

Quindi…<\/i><\/span><\/span><\/p><\/blockquote>\n<\/div>\n

Il PETG \u00e8 una plastica simile al PET delle bottiglie con aggiunta di glicole durante la sua preparazione<\/i><\/span><\/div>\n
\n

E cos’\u00e8 la o il glicole?<\/span><\/span><\/p><\/blockquote>\n<\/div>\n

Il glicole propilenico \u00e8 il componente dei moderni liquidi anti-gelo per motori. ma con bassa tossicit\u00e0)<\/i><\/span><\/div>\n
<\/div>\n
Il risultato di questa addizione chimica di glicole al PET \u00e8 un materiale pi\u00f9 chiaro e meno sensibile alla temperatura pi\u00f9 facile da estrudere.\u00a0Tuttavia<\/b>, ha lo sfortunato effetto collaterale di modificare il\u00a0processo di riciclaggio<\/i><\/b>.<\/span><\/div>\n
Il PET \u00e8 ampiamente riciclato, il PETG non lo \u00e8 (\u00e8 riciclabile, ma non \u00e8 ancora previsto il suo riciclaggio).<\/span><\/div>\n
\n

NON BUTTATE GLI AVANZI DI STAMPA CON IL PETG NEI SACCHI O BIDONI PER IL RICICLO DELLA PLASTICA<\/b>\u00a0–> \u00e8 un contaminante nel processo di riciclaggio.<\/span><\/span><\/p><\/blockquote>\n<\/div>\n

Tornando alle caratteristiche, il PETG \u00e8 un’ottima scelta di filamento per la stampa di oggetti che devono essere robusti, lisci (nel senso di smooth), con un basso restringimento e sicuri per il contatto con cibi e bevande<\/span><\/div>\n
\n

guardate comunque sempre le certificazioni sulle bobine<\/b><\/span><\/span><\/p><\/blockquote>\n<\/div>\n

<\/div>\n
Difetti…<\/i><\/b><\/span><\/div>\n
Il PETG non \u00e8 eccezionale nel bridging perch\u00e9 \u00e8 super appiccicoso (lo odio infatti…\u00a0\"?\"<\/span>\u00a0). Questo per\u00f2 garantisce un’ottima adesione tra i layer.<\/span><\/div>\n
Soffre moltissimo lo stringing e, soprattutto, \u00e8 terribilmente sensibile all’umidit\u00e0.<\/span><\/div>\n
Non \u00e8 nemmeno tanto amante dei supporti, sempre perch\u00e9 \u00e8 appiccicoso.<\/span><\/div>\n
E non lo si pu\u00f2 ventilare troppo perch\u00e9, se raffreddato velocemente, crea un effetto gommoso, prima di diventare “solido” (problemi derivati dal pap\u00e0 PET). Ti fa la pallottolina intorno all’ugello o le palline sui layer.<\/span><\/div>\n
\n

stampare un PETG umido vi concia l’ugello come se lo aveste messo nella crema di pistacchio…<\/span><\/span><\/p><\/blockquote>\n<\/div>\n

Interessante,<\/i><\/span><\/div>\n
tra i filamenti il PETG \u00e8 il pi\u00f9 sicuro per la stampa di oggetti che hanno contatto con la pelle, come bracciali, cinturini, gioielli,….<\/span><\/div>\n
<\/div>\n
ma se il PETG \u00e8 cos\u00ec semplice da stampare e diffuso perch\u00e9 il suo pap\u00e0 PET non lo \u00e8?<\/i><\/span><\/div>\n
Perch\u00e9 senza la molecola di glicole necessita di 260\u00b0 per essere estruso, diventa molliccio gi\u00e0 a temperature molto pi\u00f9 basse di 260\u00b0 compromettendo la qualit\u00e0 della pressione di estrusione, ha una coesione dei layer veramente pessima e soffre tantissimo il surriscaldamento durante la stampa (intasi l’hotend).<\/span><\/div>\n
Infatti, \u00e8 usato principalmente per stampa con presse o ad iniezione, con processi a volte ripetuti pi\u00f9 volte.<\/span><\/div>\n
<\/div>\n
Bla bla bla bla bla…<\/span><\/div>\n
\u00e8 un post, non un dottorato di ricerca, quindi mi fermo qui e se vi ho incuriosito potete guardare i link in fondo.<\/span><\/div>\n
<\/div>\n
CONSIGLI 3D (giusto due paroline)<\/b><\/i><\/span><\/div>\n
<\/div>\n
Sicuramente non \u00e8 difficile fare una stampa con il PETG.<\/span><\/div>\n
Ma fare una BELLA stampa secondo me richiede un po’ pi\u00f9 di attenzione di quanto non se ne dica.<\/span><\/div>\n
Consigli? Provate, se \u00e8 la prima volta, stampando piano…<\/span><\/div>\n
230\/240 di hotend, piatto 70\/80\u00b0, 30% di vetilazione con 70% (100%) solo in caso di overhang o bridge.<\/span><\/div>\n
Se le stampe sono larghe un p\u00f2 di lacca male non fa.<\/span><\/div>\n
\n

Mi piace questa frase che ho trovato, che dice come riconoscere dal primo layer se il profilo di stampa \u00e8 buono:<\/span><\/span><\/p><\/blockquote>\n<\/div>\n

\n

“If the extruded material doesn\u2019t feel a little greasy” … che significa se il materiale estruso non sembra un p\u00f2 unto… E’ vero\u00a0\"?\"<\/span>, lucido, grassottello…<\/span><\/span><\/p><\/blockquote>\n<\/div>\n

<\/div>\n
Alla prossima<\/span><\/div>\n
<\/div>\n
https:\/\/all3dp.com\/2\/petg-filament-all-you-need-to-know\/<\/a><\/span><\/div>\n
<\/div>\n
https:\/\/www.3dnatives.com\/…\/petg-3d-printing-guide…\/<\/a><\/span><\/div>\n
<\/div>\n
https:\/\/www.stampa3d-forum.it\/…\/come-si-stampa-il-petg…\/<\/a><\/span><\/div>\n","protected":false},"excerpt":{"rendered":"

Questa sera ho cercato un po’ di documentazione in rete<\/p>\n","protected":false},"author":4,"featured_media":213,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[15],"tags":[],"class_list":["post-107","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materiali"],"yoast_head":"\nIL PETG !!! 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