Enwere ọtụtụ ụdị mpempe akwụkwọ plastik nwere oke ojiji. Ugbu a, ụdị ndị bụ isi bụ polyvinyl chloride, polystyrene na polyester (PET). Mpempe akwụkwọ PET nwere arụmọrụ dị mma ma zute ihe ndeksi ịdị ọcha nke mba chọrọ maka ngwaahịa a kpụrụ na ihe nchekwa gburugburu ụwa chọrọ. Ha so na tebụl nchekwa gburugburu ebe obibi. Ugbu a, nkwakọ ngwaahịa kwesịrị izute ihe nchekwa gburugburu ebe obibi na ihe eji emegharị ihe, yabụ na-achọ akwụkwọ PET na-arị elu. Isiokwu a na-atụlekarị usoro mmepụta na nsogbu nkịtị nke mpempe akwụkwọ PET.
Teknụzụ mmepụta akwụkwọ PET:
(1) mpempe akwụkwọ PET
Dị ka plastik ndị ọzọ, njirimara nke mpempe akwụkwọ PET nwere njikọ chiri anya na ịdị arọ molekụla. A na-ekpebi ịdị arọ molekụla site na viscosity dị n'ime. Ihe dị elu nke viscosity dị n'ime ya, ka mma anụ ahụ na kemịkal dị mma, mana mmiri na-adịghị mma na ihe isi ike na-etolite. Na ala viscosity dị n'ime, na-akawanye njọ nke anụ ahụ na kemịkal na mmetụta ike. Ya mere, viscosity dị n'ime akwụkwọ PET kwesịrị ịbụ 0.8dl/g-0.9dl/g.
(2) Usoro mmepụta ihe
Isiakụrụngwa mmepụta maka mpempe akwụkwọ PETna-agụnye ụlọ elu crystallization, ụlọ elu ihicha, extruders, die isi, atọ mpịakọta calenders na coilers. Usoro mmepụta bụ: raw material crystallization- drying-extrusion plasticization-extrusion molding-calendering and shape-winding ngwaahịa.
1. Crystallization. Mpekere PET na-ekpo ọkụ na kristal na ụlọ elu crystallization iji kwado ụmụ irighiri ihe ndị ahụ, wee mụbaa okpomọkụ mgbanwe iko nke mpekere ahụ iji gbochie nrapanye na mkpuchi nke hopper n'oge usoro ihicha. Crystallization na-abụkarị nzọụkwụ dị mkpa. Crystallization na-ewe nkeji 30-90 na okpomọkụ dị n'okpuru 149 Celsius.
2.Akọrọ. N'ebe okpomọkụ dị elu, mmiri ga-agbaze ma mebie PET, na-eme ka mbelata nke njide njirimara ya, na ihe anụ ahụ ya, karịsịa ike mmetụta, ga-ebelata ka ịdị arọ molekụla na-ebelata. Ya mere, tupu agbaze na extruding, PET kwesịrị ka a mịrị amị iji belata ọdịnaya mmiri, nke kwesịrị ịbụ ihe na-erughị 0.005%. A na-eji igwe nkụ na-eme ka mmiri dị ọcha mee ihe maka ihicha. N'ihi hygroscopicity nke ihe PET, mgbe mmiri na-abanye n'ime elu nke iberi ahụ, a ga-enwe njikọ molekụla, akụkụ ọzọ nke mmiri ahụ ga-abanyekwa n'ime mpekere ahụ, na-eme ka ihicha sie ike. Ya mere, a pụghị iji ikuku ọkụ nkịtị mee ihe. A na-achọ ka igirigi ikuku na-ekpo ọkụ ka ọ dị ala karịa -40C, ikuku na-ekpo ọkụ na-abanyekwa na ihicha ihicha site na sekit mechiri emechi maka ihicha na-aga n'ihu.
3. Apịpịa. Mgbe kristal na ihichachara, PET na-agbanwe ka ọ bụrụ polymer nwere ebe mgbaze doro anya. Okpomọkụ na-akpụzi polymer dị elu yana oke njikwa okpomọkụ dị warara. A na-eji ihe mgbochi mgbochi polyester dị iche iche kewapụ ihe ndị na-adịghị agbaze na agbaze, nke na-enyere aka ịkwado usoro ịkwa akwa ogologo ma na-abawanye mmepụta nke extruder. Na-eji mkpanaka trotul na-emegharị emegharị egbugbere ọnụ na-agbanwe agbanwe. A na-akụ isi ebu ahụ. Ndị na-agba ọsọ na-agba ọsọ na egbugbere ọnụ na-enweghị ọkọ na-egosi na njedebe kwesịrị ịdị mma. Igwe na-ekpo ọkụ na-akpụ akpụ nwere ọrụ drainage na nhicha.
4.Cooling na ịkpụzi. Mgbe agbaze na-apụta n'isi, ọ na-abanye ozugbo na kalenda mpịakọta atọ maka calending na jụrụ oyi. A na-edobe anya dị n'etiti calender rola atọ na isi igwe na ihe dịka 8cm, n'ihi na ọ bụrụ na anya dị oke ukwuu, bọọdụ ahụ ga-adị mfe na-agbagharị ma na-agbagharị, na-eme ka njedebe adịghị mma. Tụkwasị na nke ahụ, n'ihi ogologo oge dị anya, ikpo ọkụ na ikpo ọkụ na-adị ngwa ngwa, na kristal na-acha ọcha, nke na-adịghị mma na-atụgharị. The atọ-rola calending unit mejupụtara elu, n'etiti na ala rollers. A na-edozi okporo osisi nke etiti etiti. N'oge a na-eme ka ahụ dị jụụ na calending, okpomọkụ dị n'elu ala bụ 40 ° C-50c. Ogwe nke elu na nke ala rollers nwere ike ibuli elu na ala.
Oge nzipu: Sep-28-2023
