Stretch Film kintu kya polimeeri ekikozesebwa ennyo mu kupakinga eby’okutambuza ebintu. Enkola yaayo ey’okusengejja ekosa butereevu enkola n’okuvuganya kw’akatale k’ekintu. Olw’okulongoosa ebyetaago by’okukuuma obutonde bw’ensi n’okukyusakyusa mu byetaago by’okupakinga, tekinologiya w’okusengejja firimu ewanvuwa nayo eyiiya buli kiseera. Ekiwandiiko kino kijja kwekenneenya mu bujjuvu enkola y’okusengejja enkulu (core synthesis method) ya firimu ewanvuwa okuva mu kulonda ebigimusa, enkola y’okukola ekirungo (polymerization process) okutuuka ku tekinologiya w’okukola firimu.
Okulonda ebikozesebwa ebisookerwako: omusingi gusalawo omulimu .
Ekintu ekikulu ekisookerwako ekya firimu egoloddwa ye polyethylene (PE). Okusinziira ku kigendererwa, wansi-Density polyethylene (LDPE), linear low-Density polyethylene (LLDPE) oba waggulu-Density polyethylene (HDPE) esobola okulondebwa. LDPE ewa firimu okukyukakyuka n’obwerufu obulungi, ate LLDPE esobola okulongoosa ennyo amaanyi g’okusika n’okuziyiza okuboola. Mu myaka egiyise, obutonde bwa metallocene polyethylene (MPE) bufuuse mpolampola ekintu ekisookerwako ekyettanirwa ennyo-End stretch film olw’ensengeka yaayo eya molekyu esinga okuba ey’enjawulo n’okukola obulungi ennyo. Okugatta ku ekyo, okusobola okutuukiriza ebyetaago ebitongole, ebintu ebimu bijja kwongerako ebirungo nga tackifiers, UV inhibitors oba antioxidants.
Enkola y’okukola polimeeri: okuva ku monomer okutuuka ku polimeeri .
Okusengejja kwa polyethylene kusinga kutuukirizibwa okuyita mu nkola ya polymerization reaction ya ethylene. Enkola eza bulijjo mulimu okunyigirizibwa kwa waggulu-okunyigirizibwa n’okunyigirizibwa okutono -okunyigirizibwa. High-Pressure polymerization (nga enkola ya tubular oba kettle method) esaanira okukola LDPE. Embeera z’ensengekera (reaction conditions) nkambwe era free radical polymerization yeetaagibwa wansi w’ebbugumu erya waggulu ne puleesa eya waggulu. Low-Okunyigiriza polymerization (nga enkola ya gas phase oba enkola ya solution) ekozesebwa okukola LLDPE ne HDPE. Ziegler-Natta catalyst oba metallocene catalyst etera okukozesebwa. Embeera z’ensengekera (reaction conditions) ziba ntono ate ensaasaanya y’obuzito bwa molekyu efugibwa. Enkola ez’omulembe zitera okukozesa ggaasi-Phase fluidized bed technology okutumbula obulungi bw’okufulumya n’okukendeeza ku maanyi agakozesebwa.
Tekinologiya w'okukola firimu: omuzannyo wakati w'okubumba okufuuwa n'okuzannya firimu
Okukola firimu y’okuzinga okusinga kwesigama ku nkola bbiri: okubumba okubumba n’okusuula firimu. Enkola y’okubumba okufuuwa efuuwa resini eyasaanuuse mu firimu ya tubular okuyita mu mutwe gwa die ogw’enkulungo, n’oluvannyuma n’etonnya, n’esika n’agiwugula. Enkola eno ntono-esasulira era esaanira okufulumya okunene-, naye obumu bw’obuwanvu bwa firimu buba bwa wansi katono. Enkola ya firimu eya cast ekozesa omutwe gwa die ogupapajjo okufulumya butereevu firimu, ekolebwa mangu ekizimbulukusa ekinyogoza. Ekintu ekiwedde kirina obuwanvu obusingako obw’enjawulo n’obwerufu obusingako, naye ssente z’okuteeka mu byuma munene. Mu myaka egiyise, multi-Layer CO-tekinologiya w'okubunyisa amawulire afuuse omukulu. Nga tussa layers za resin nga zirina eby’obugagga eby’enjawulo, amaanyi amangi, obwerufu obw’amaanyi n’obuzito obulungi bisobola okutuukibwako mu kiseera kye kimu.
Omuze gw’okukuuma obutonde bw’ensi: guvunda era gusobola okuddamu okukozesebwa .
Olw’okunyweza amateeka g’ensi yonna agakwata ku butonde bw’ensi, tekinologiya w’okugatta firimu ewanvuwa agenda mu maaso n’okuvunda n’okuddamu okukola ebintu mu ngeri ennyangu. Okukozesa bio-okusinziira ku polyethylene (nga PE ekoleddwa mu ethanol y’omuwemba) n’ebirungo ebivunda egenda ekyusa mpolampola ebikozesebwa eby’ennono eby’amafuta. Mu kiseera kye kimu, okukendeeza ku buwuka obuva mu kirungo (VOCS) nga tulongoosa enkola y’okusengejja nakyo kifuuse ekintu ekikulu mu kufaayo kw’amakolero.
Tekinologiya w’okugatta firimu eziwanvuwa (stretch film) egatta enkulaakulana y’ennimiro eziwera eza kemiko wa polimeeri, yinginiya w’ebikozesebwa ne ssaayansi w’obutonde. Mu biseera eby’omu maaso, olw’okumenyawo enkola empya ez’okutabula n’enkola za green, omulimu n’okuyimirizaawo firimu eziwanvuwa bijja kwongera okulongoosebwa, nga biwa eby’okugonjoola ebisingako obulungi eri ekitongole ky’ensi yonna eky’okupakinga.