Akụkọ

N'ime afọ ndị na-adịbeghị anya, e nwere usoro ihe nkedo nke multi-screw extruder e guzobere n'ahịa dị ka ihe ọzọ maka Single - screw extruders na usoro tupu ihicha. (N'ebe a, anyị na-akpọ usoro mkpochapụ ọtụtụ ihe gụnyere Twin-screw extruders, Planetary roller extruders wdg.)

Ma anyị chere na ọ dị mkpa inwe tupu ihicha usoro ọbụna na ị na-eji multi-skru extruder. N'ihi na:

1) Multi-screw extruders ihe ha niile nwere bụ nnọọ mgbagwoju agụụ-degassing usoro arụnyere na extruder iji gbochie a hydrolysis mmetụta na-eme n'ihi na ọ dịghị tupu ihicha usoro arụnyere. Ọtụtụ mgbe, ụdị extruder dị iche na-eji ọnọdụ:

Mmiri nri kacha mma agaghị adị elu karịa 3000 ppm (0.3%)

N'ezie, flakes karama na-egosi ọdịiche dị na ịdị ọcha, nha urughuru, nkesa nha nha na ọkpụrụkpụ - na karịsịa na iru mmiri. Flakes ndị na-azụ ahịa na-enye ohere idowe iru mmiri ruru 5,000 ppm n'ime ngwaahịa na ịchekwa ọtụtụ oge mmiri a n'elu ya. N'obodo ụfọdụ, mmiri mmiri nwere ike iru 14,000 ppm ọbụna juru na nnukwu akpa.

Ma ọkwa zuru oke nke ọdịnaya mmiri na ọdịiche ya, bụ nke a na-apụghị izere ezere, bụ ezigbo ihe ịma aka maka onye na-emepụta ihe na-emepụta ihe na-emepụta ihe na echiche degassing metụtara ya. Nke a na-emekarị na-ebute mgbanwe usoro, nke a na-aghọta site na nrụgide mmepụta dị oke agbanwe nke extruder. Ọ ga-ekwe omume na nnukwu mmiri mmiri ka dị ka ọ na-erute agbaze ya na extruder n'ihi ọkwa mmiri mbụ na nke mbụ. resin, na ego ewepụrụ n'oge agụụ

2) PET bụ nnukwu hygroscopic ma na-amịkọrọ mmiri sitere na ikuku. Obere mmiri ga-eme ka PET mee ka mmiri na-agbaze n'oge agbaze, na-ebelata ibu molekụla. PET ga-akọrọ tupu nhazi, na amorphous PET chọrọ crystallizing tupu ihicha ka ụmụ irighiri ihe ghara ịrapara ọnụ ka ha na-aga n'agbanyeghị iko mgbanwe.

Hydrolysis nwere ike ime n'ihi mmiri na nke a na-emekarị ka ọ bụrụ mbelata na IV (Intrinsic Viscosity) nke ngwaahịa. PET bụ "ọkara kristal". Mgbe IV na-ebelata, karama ndị ahụ na-agbaji ma na-adaba na "ọnụ ụzọ" (ebe injection) n'oge ịfụ na njuputa.

Na steeti "crystalline" ya nwere akụkụ kristal na amorphous n'ụdị molekụla ya. Akụkụ kristal na-etolite ebe ụmụ irighiri ihe nwere ike kwado onwe ha n'usoro ahịrị kọmpat. Na mpaghara ndị na-abụghị kristal, ụmụ irighiri ihe dị na nhazi nke enweghị usoro. Site na ijide n'aka na kristal gị dị elu, tupu nhazi ya, ihe ga-esi na ya pụta ga-abụ otu ụdị na ngwaahịa dị elu.

ODE mere IRD Infrared Rotary Drum Systems arụọla ọrụ ndị a n'ụzọ dị oke ume karịa. Igwe ọkụ infrared pụrụ iche emebere na-akpalite mgbanwe okpomọkụ nke mkpụrụ ndụ n'ime ihe akọrọ ozugbo na-ewereghị usoro etiti na-adịghị mma nke iji ikuku dị ọkụ. Ụzọ ikpo ọkụ dị otú ahụ na oge ikpo ọkụ na oge ihicha na-ebelata ka ọ bụrụ naanị 8.5 ruo 20 nkeji dabere na ngwa a kapịrị ọnụ, ebe a ga-agbakọ ọtụtụ awa maka usoro ikuku na-ekpo ọkụ ma ọ bụ akọrọ.

Infrared ihicha nwere ike imeziwanye arụmọrụ nke ejima-screw extruder n'ihi na ọ na-ebelata mmebi nke ụkpụrụ IV ma na-eme ka nkwụsi ike nke usoro dum dịkwuo mma.