cellophane

Cellophane yog cov khoom ntim khoom qub tshaj plaws uas siv los qhwv ncuav qab zib, khoom qab zib thiab txiv ntoo.Cellophane yog thawj zaug ua lag luam hauv Tebchaws Meskas hauv xyoo 1924 thiab yog thawj lub hnab ntim khoom siv rau xyoo 1960s.Hauv kev lag luam niaj hnub no ntau dua ib puag ncig, cellophane tau rov qab los.Vim hais tias cellophane yog 100% biodegradable, nws pom tau tias yog ib qho kev phooj ywg zoo dua rau kev ntim khoom uas twb muaj lawm.Cellophane kuj muaj qhov nruab nrab dej vapor ntsuam xyuas nrog rau kev ua haujlwm zoo heev thiab kev sib khi ua kom sov, ntxiv rau nws qhov chaw tam sim no hauv khw ntim khoom noj.

Tsis zoo li cov txiv neej tsim cov polymers hauv cov yas, uas feem ntau yog muab los ntawm cov roj av, cellophane yog cov khoom siv ntuj tsim los ntawm cellulose, uas yog ib feem ntawm cov nroj tsuag thiab ntoo.Cellophane tsis yog tsim los ntawm cov ntoo rainforest, tab sis los ntawm cov ntoo cog thiab sau tshwj xeeb rau cellophane ntau lawm.

Cellophane yog tsim los ntawm kev zom cov ntoo thiab paj rwb hauv cov tshuaj da dej uas tshem tawm cov impurities thiab rhuav tshem cov hlua fiber ntau ntev hauv cov khoom siv raw.Regenerated rau hauv ib tug ntshiab, glossy zaj duab xis nrog plasticizing chemicals ntxiv los txhim kho yooj, lub cellophane tseem yog feem ntau tsim los ntawm crystalline cellulose molecules.

Qhov no txhais tau tias nws tuaj yeem tawg los ntawm cov kab mob hauv cov av xws li nplooj thiab nroj tsuag.Cellulose belongs rau ib chav kawm ntawm cov tebchaw hauv cov organic chemistry hu ua carbohydrates.Lub hauv paus ntawm cellulose yog cov piam thaj molecule.Ntau txhiab ntawm cov piam thaj molecules no sib sau ua ke thaum lub sij hawm cov nroj tsuag loj hlob mus rau hauv cov saw ntev hu ua cellulose.Cov chains no, nyob rau hauv lem, tawg thaum lub sij hawm tsim khoom los tsim cellulose films uas yog siv nyob rau hauv uncoated los yog coated daim ntawv nyob rau hauv ntim.

Thaum faus, uncoated cellulose films feem ntau degrade nyob rau hauv 10 mus rau 30 hnub;PVDC-coated films tau pom tias degrade hauv 90 mus rau 120 hnub, thiab nitrocellulose-coated cellulose degraded hauv 60 mus rau 90 hnub.

Cov kev ntsuam xyuas tau pom tias qhov nruab nrab tag nrho lub sij hawm ua kom tiav biodegradation ntawm cellulose films yog 28 mus rau 60 hnub rau cov khoom tsis coated thiab 80 mus rau 120 hnub rau coated cellulose cov khoom.Hauv dej hauv pas dej, tus nqi biodegradation yog 10 hnub rau cov yeeb yaj kiab tsis muaj coated thiab 30 hnub rau cov yeeb yaj kiab coated cellulose.Txawm tias cov ntaub ntawv uas suav tias yog degradable heev, xws li ntawv thiab nplooj ntsuab, yuav siv sij hawm ntev rau degrade tshaj cellulose zaj duab xis cov khoom.Hauv qhov sib piv, cov yas, polyvinyl chloride, polyethylene, polyethylene terephthalate thiab taw qhia polypropylene pom me ntsis ntawm kev degradation tom qab kev faus ntev. 

Cellophane films yog siv nyob rau hauv ntau yam ntaub ntawv ntim, xws li:

- Khoom qab zib, tshwj xeeb tshaj yog twist qhwv

- Cardboard lamination

-Yeast

- mos cheese

- Tampon ntim

- Ntau daim ntawv thov kev lag luam xws li substrates rau nws tus kheej-nplaum tapes, permeable membranes hauv ib nrab ntawm cov roj teeb, thiab tso tawm cov neeg sawv cev hauv kev tsim cov khoom fiberglass thiab roj hmab.

- qib zaub mov

- Nitrocellulose txheej

- PVDC txheej

- Pharmaceutical Ntim

- daim nplaum

- Xim zaj duab xis