Virgin PLA resin, bụ crystallized na akpọnwụwo ruo 400-ppm mmiri larịị tupu ịhapụ ụlọ ọrụ mmepụta.PLA na-ebuli mmiri ambient ngwa ngwa, ọ nwere ike ịmịkọrọ mmiri ruru 2000 ppm n'ọnọdụ ime ụlọ mepere emepe yana ọtụtụ nsogbu enwere na PLA na-esite na ihicha ezughị oke.A chọrọ ka akpọọcha PLA nke ọma tupu nhazi.N'ihi na ọ bụ polymer condensation, ọnụnọ nke ọbụna obere mmiri mmiri n'oge nhazi agbaze na-akpata mmebi nke ụdọ polymer na ọnwụ nke ịdị arọ molecular na ihe ndị na-arụ ọrụ.PLA chọrọ ogo dị iche iche nke ihicha dabere na ọkwa yana otu a ga-esi jiri ya.N'okpuru 200 PPM ka mma n'ihi na viscosity ga-adịkwu mma ma hụ na ngwaahịa dị mma.
Dị ka PET, a na-ebuga nwa agbọghọ na-amaghị nwoke PLA tupu kristal.Ọ bụrụ na emeghị ka ọ bụrụ crystallized, PLA ga-adị nnyapade na mkpọkọta mgbe okpomọkụ ya ruru 60 ℃.Nke a bụ okpomọkụ mgbanwe ugegbe nke PLA (Tg);ebe ihe amorphous na-amalite ime ka ọ dị nro.(Amorphous PET ga-agbago na 80 ℃) Ntughari ihe enwetara site na mmepụta ụlọ dị ka mkpụbelata akụkụ extruder ma ọ bụ scrap skeleton a na-ekpo ọkụ ga-abụ crystalized tupu enwee ike ịmegharị ya.Ọ bụrụ na PLA crystallized na-abanye na usoro ihicha ma kpughee ya na ikpo ọkụ n'elu 140 F, ọ ga-eme ka ọ dịkwuo njọ ma mee ka ihe mgbochi dị egwu na ụgbọ mmiri dum.Ya mere, a na-eji crystallizer mee ka PLA gbanwee site na Tg mgbe ọ nọ n'okpuru mkpasu iwe.
Mgbe ahụ, PLA chọrọ Dryer na crystallizer
1. Usoro ihicha nke ọma --- ihe na-ekpochapụ (desiccant) nkụ
Amorphous akara ule eji maka okpomọkụ akara n'ígwé na fim na-akpọnwụ na 60 ℃ maka 4 awa.A na-akpọkwa akara akara kristal a na-eji ewepụta mpempe akwụkwọ na ihe nkiri na 80 ℃ maka awa 4.Usoro nwere ogologo oge obibi ma ọ bụ okpomọkụ dị elu dị ka eriri eriri chọrọ ihicha karịa, ruo ihe na-erughị 50 PPM nke mmiri.
Na mgbakwunye, igwe nkụ infrared kristal --- IR Dryer egosila na ọ na-eme ka Ingeo biopolymer kristal nke ọma n'oge ihicha.iji infrared ihicha (IR).N'ihi ọnụ ọgụgụ dị elu nke nnyefe ike na ikpo ọkụ IR na-ejikọta ya na ogologo ebili mmiri a kapịrị ọnụ, enwere ike ibelata ụgwọ ọrụ ike nke ukwuu, yana nha.Nnwale mbụ egosila na nwa agbọghọ na-amaghị nwoke Ingeo biopolymer nwere ike akpọnwụ na amorphous flake crystallized na akpọnwụọ n'ime nanị ihe dị ka nkeji iri na ise.
Igwe ikuku kristal infrared --- ODE Design
1. Na nhazi nke ihicha na crystallizing n'otu oge
2. ihicha oge bụ 15-20mins (Ihicha oge nwekwara ike gbanwee dị ka ndị ahịa 'chọrọ na ihicha ihe)
3. ihicha okpomọkụ nwere ike mgbanwe (Range si 0-500 ℃)
4. Mmiri ikpeazụ: 30-50ppm
5. Ọnụ ego ike na-echekwa banyere 45-50% iji tụnyere Desiccant draya & crystallizer
6.Space ichekwa: ruo 300%
7. A na-achịkwa usoro niile Siemens PLC, dị mfe maka ịrụ ọrụ
8. Ngwa ngwa ịmalite
9. Mgbanwe ngwa ngwa na oge nkwụsị
Ngwa ngwa PLA (polylactic acid) bụ
Ọkụ extrusion: akpa tii, uwe.
Ịkpụzi injection: ọla ọla.
Ngwakọta: ya na osisi, PMMA.
Thermoforming: clamshells, kuki trays, iko, kọfị pọd.
Ịkpụzi ihe: karama mmiri (abụghị carbonated), ihe ọṅụṅụ ọhụrụ, karama ịchọ mma.
Oge nzipu: Feb-24-2022