ntchito

PE blowing molding film process

Hopper kudyetsa - zinthu plasticizing extrusion - kuwomba traction - mphepo mphete kuzirala - hering'i splint - traction wodzigudubuza traction - corona mankhwala - filimu yokhotakhota, koma ndi ofunika kunena kuti ntchito ya filimu kuwomberedwa ali ndi ubale waukulu ndi magawo kupanga ndondomeko, Choncho. , mu ndondomeko kuwomba filimu, ayenera kulimbikitsa ulamuliro magawo ndondomeko, yovomerezeka ndondomeko ntchito, kuonetsetsa kupanga yosalala, Ndi kupeza mkulu khalidwe filimu mankhwala.

Kukonza ndi zigawo zikuluzikulu za filimu yaulimi

Kanema waulimi amapangidwa ndi polima wapamwamba kwambiri ngati thupi lalikulu, ndikuwonjezera zowonjezera zogwira ntchito, pambuyo pokonza nkhonya.Zinthu zabwino za filimu yokhetsedwa ndi polyolefin, monga polyethylene (PE), polyvinyl chloride (PVC), ethylene - vinyl acetate copolymer (EVA) ndi thermoplastics zina.

Thermoplastics alibe malo osungunuka ngati mamolekyulu otsika, koma amasungunuka pakanthawi kochepa kutentha, komwe amakhala ndi viscoelastic.Pogwiritsa ntchito malowa, akhoza kutenthedwa mumtundu wosungunuka wofanana ndi shuga wa chingamu, kuwomba kuwira, kuziziritsa, kuchiritsa, kuumba, kukokera kuti mutenge filimu yokhetsedwa.

Gulu la filimu yaulimi

1, filimu yotsutsa kukalamba (filimu yotaya moyo wautali).Onjezani masauzande angapo a chowongolera bwino kwambiri cha kuwala kuzinthu zazikulu zopangira.Kukhetsa filimu m'malo okosijeni ndi kuwala (makamaka ultraviolet) kuwala, padzakhala kusintha kosiyanasiyana, monga kusinthika, kuwonongeka kwa pamwamba, kuwonongeka kwa makina.Moyo wautumiki wa filimu wamba ya polyolefin shed ndi miyezi 4 mpaka 5 yokha, pomwe ulimi wamba wanyengo yozizira umafunika moyo wa filimu yokhetsedwa ndi miyezi 9 mpaka 10.Moyo wopitilira wautumiki wa zigawo kapena mitundu ya mbewu zimafunikira kuti filimu yokhetsedwa ikhale yopitilira zaka 2, ndipo moyo wa filimu yokhetsa maluwa ndi filimu ya ginseng ndi yopitilira zaka zitatu.Cholinga cha pamwambachi chikhoza kutheka powonjezera masauzande angapo a wothandizira kuwala kokhazikika kuti akonzekere filimu yotaya moyo wautali.

2, palibe filimu yotsitsa.Kanema wokhetsedwa momwe ma surfactants ena amawonjezedwa pazinthu zazikulu kuti mawonekedwe amkati a filimuyo asawonekere (kapena samawoneka kawirikawiri kwa nthawi inayake) madontho a condensation pakugwiritsa ntchito zokutira.M'nyengo yozizira, kutentha mkati mwa wowonjezera kutentha kumakhala kwakukulu kuposa kunja, ndipo chinyezi chimakhala chachikulu, wowonjezera kutentha amakhala ngati chikho chokulitsa filimu yamadzi otentha.Madzi nthunzi n'zosavuta kufika mame mfundo pambuyo kukhudzana ndi filimu, kupanga madzi m'malovu pa mkati padziko filimuyo.Dontho lamadzi liri ngati lens, pamene kuwala kuchokera kunja kupita kumalo okhetsedwa, pamwamba pa madzi kumapangitsa kuti kuwalako kuwonekere, kuwala sikungalowe muzitsulo, kuchepetsa kwambiri kuwala kwa filimu yokhetsedwa, osati kothandiza. ku photosynthesis ya mbewu.Ngati kuwala kwayang'ana pa "magalasi" ndikugunda chomera, kumawotcha mbewuyo ndikuyivulaza.Madontho akuluakulu amadzi pa mbewu amatha kuwononga mbewu.Pambuyo powonjezerapo ma surfactants, pamwamba pa filimu yopanda kudontha imasinthidwa kukhala hydrophobic kukhala hydrophilic, ndipo madontho amadzi posachedwapa apanga filimu yamadzi yowonekera pamtunda wamkati wa filimu yokhetsedwa, ndipo kufalikira kwa filimuyo sikuli. okhudzidwa.

3, palibe dontho, chifunga kuchotsa ntchito anakhetsa filimu.Fluoride ndi silicon antifogging agents anawonjezedwa pamaziko a filimu yopanda kudontha.Zima dzuwa wowonjezera kutentha ntchito ambiri filimu chivundikirocho, nthawi zambiri kubala lolemera chifunga, wowonjezera kutentha kuwala kwambiri yafupika, zimakhudza chitukuko cha mbewu, komanso zosavuta kuyambitsa matenda.Pamaziko a filimu yopanda kudontha, onjezerani fluorine ndi silicon fogging agent, kotero kuti nthunzi yamadzi mu susaturated boma la okhetsedwa akhoza mofulumira condendene pamwamba pa okhetsedwa filimu, ndi pansi pa zochita za kukapanda kukapanda kuleka. wothandizila, madzi m'malovu pamodzi pamwamba pa wowonjezera kutentha filimu mofulumira wothandiza kufalikira ndi kuyenda pansi, ndi kukapanda kuleka, chifunga ntchito ya anakhetsa filimu.

4, filimu yowala (filimu yotembenuza kuwala).The kuwala kutembenuka wothandizila anawonjezedwa kwa waukulu zopangira.M'zaka zaposachedwa, malinga ndi mfundo ya chilengedwe cha kuwala, teknoloji yotembenuza mphamvu ya dzuwa imagwiritsidwa ntchito pafilimu yaulimi, ndiko kuti, kutembenuka kwa kuwala kumawonjezeredwa ku filimu yokhetsedwa, mphamvu ya dzuwa mu photosynthesis ya zomera ndi yaying'ono kwambiri kufiira. kuwala lalanje yabwino kubzala kukula, kusintha photosynthesis zomera mu pulasitiki anakhetsa filimu, kusintha mlingo wa magwiritsidwe ntchito mphamvu kuwala kwa pulasitiki wowonjezera kutentha, kuti patsogolo khalidwe la zomera.Monga kusintha kukoma kwa zipatso, kukhwima koyambirira, kuonjezera kupanga, kuonjezera ndalama, kukongoletsa mtundu wa maluwa ndi mitengo.

5, filimu yotchinga kwambiri.Pogwiritsa ntchito ma transmittance owoneka bwino kwambiri, infuraredi kutsekereza zotsatira za polima wapamwamba ndi kuwonjezera infuraredi absorbent, opangidwa ndi kutentha kwambiri kutchinjiriza filimu.Kanema wotsekereza kwambiri amatha kuyamwa kutentha kowala momwe angathere masana ndikuchepetsa kutentha kwambiri momwe angathere usiku.Masana, kuwala kwa dzuwa kumawalira kwambiri mufilimuyo ndi kuwala kowoneka bwino kwa 0.3 ~ 0.8 micron, komwe kumawonjezera kutentha kwa wowonjezera kutentha ndikutenga kutentha kwambiri m'nthaka.Usiku, pali kusiyana kwa kutentha pakati pa mkati ndi kunja, ndipo nthaka imatulutsa kutentha mu mawonekedwe a kuwala kwa infrared ndi kutalika kwa 7-10 microns.Chifukwa chake, pogwiritsira ntchito polima yapamwamba yokhala ndi kuwala kwakukulu kowoneka bwino komanso kutsekereza kwa infuraredi, komanso powonjezera chotsitsa cha infuraredi, anthu apanga filimu yosunga kutentha kwambiri.Pakalipano, kupita patsogolo kwakukulu kwachitika pakugwiritsa ntchito zipangizo za nano-insulation pa nembanemba.

6, nembanemba multifunctional.Malinga ndi gulu processing njira gulu, pali limodzi wosanjikiza filimu ndi multilayer co-extrusion gulu filimu, yotsirizira ndi multifunctional filimu.Mwachitsanzo, filimu ya 0.1mm ikhoza kupangidwa ndi zigawo za 3, kufunikira kwake ndiko, powonjezera zowonjezera zowonjezera komanso zachuma pamtundu uliwonse, perekani filimu yokhetsedwa yofunikira ntchito zambiri.Mwachitsanzo, onjezani madontho ochulukirapo ndi zinthu zopangira chifunga pakati, ndikuwonjezeranso chowongolera chakunja.

7, filimu yamtundu.Amapangidwa molingana ndi mfundo ya optics.Pansi pa chivundikiro cha filimu yofiira, mbande za thonje zinakula bwino, tsinde linali lakuda, mizu inapangidwa ndipo chiwerengero cha kupulumuka chinali chachikulu.Kubzala kaloti ndi kabichi ndi filimu yachikasu yaulimi kumatha kufulumizitsa kukula kwawo, ndipo kuphimba nkhaka kumatha kuwonjezera zokolola ndi zoposa 50%.Kugwiritsa chibakuwa ulimi filimu akhoza kwambiri kuonjezera zokolola za biringanya, leek ndi chinanazi;Ma strawberries pansi pa zokutira buluu amabala zipatso zazikulu komanso zambiri.Ubwino wa filimu yamitundu polimbikitsa kupanga mbewu, kuchulukitsa zokolola komanso kuwongolera bwino zikuwonetsa mwayi wogwiritsa ntchito.

8. Kuwonongeka kwa membrane.Amapangidwa chifukwa cha "kuipitsa koyera" komwe kumachitika chifukwa cha filimu yonyansa yaulimi.Filimu yotsalira ya filimu yowonongeka ikhoza kudziwononga yokha mu nthawi yochepa mothandizidwa ndi zinthu zosiyanasiyana zachilengedwe.Mafilimu owononga akhoza kugawidwa m'njira zitatu: photodegradation, biodegradation ndi photobiodegradation.Mafilimu a e starch ndi grass fiber omwe akupangidwa m'dziko lathu ndi amafilimu owononga.Zitsanzo zapangidwa ndikuyikidwa m'magulu ang'onoang'ono.