Cov khoom siv dab tsi yog cov hnab yas feem ntau ua los ntawm?

1. Cov khoom siv raw
Cov ntaub ntawv tseem ceeb ntawm cov hnab yas yog polyethylene thiab polypropylene, uas yog cov khoom siv petrochemical uas tsim cov khoom siv polymer tom qab polymerization. Cov khoom no tuaj yeem tsim thiab ua tiav rau hauv cov khoom siv raw rau cov hnab yas los ntawm cov nroj tsuag tshuaj lossis cov tuam txhab petrochemical.

2. Cov txheej txheem ntau lawm
Cov txheej txheem ntawm kev tsim cov hnab yas feem ntau suav nrog cov kauj ruam hauv qab no:

• Cov khoom siv pretreatment: yaj thiab sib tov cov khoom raw khoom, kho cov khoom siv ntxiv rau cov khoom thiab tswj cov khoom tsis sib xws.
• Blown film: Ib lub tshuab tshuab tshuab yog siv los extrude cov yas molten los ntawm qhov tuag los ua ib zaj duab xis.
• Printing: Sau cov qauv los yog cov ntawv luam tawm rau saum npoo ntawm zaj duab xis.
• Txiav: Txiav cov ntawv luam rau hauv qhov ntau thiab tsawg los ntawm lub hnab txiav tshuab.
• Kev ua tiav cov khoom tiav: Cov hnab yas txiav yog raug rau deburring, shaping thiab lwm yam txheej txheem ua cov khoom kawg.

3.Qee yam khoom thiab siv cov khoom siv lub hnab yas.

• Polyethylene hnab yas (PEhnab yas): Polyethylene yog polymerized thiab yog cov khoom tsis muaj tshuaj lom uas tsis muaj ntxhiab tsw thiab muaj zog tshuaj lom neeg ruaj khov. Qhov kub ntawm kev siv txhua hnub yog -100 ~ 70 degree , thiab nws feem ntau yog siv los ntim cov zaub mov lossis ntim khoom noj ncaj qha hauv lub neej txhua hnub. Txawm li cas los xij, txij li qhov ntsuas kub ntawm PE hnab yas qis dua 70 degree, lawv tsis tuaj yeem muaj cov khoom kub.
• Polypropylene (PPhnab yas): Polypropylene feem ntau yog tov nrog me me ntawm ethylene hauv ib copolymer. Cov khoom siv raw yog cov khoom tsis muaj xim tsis muaj xim, tsis muaj tshuaj lom thiab tsis muaj ntxhiab. Nws cov ntsiab lus melting yog siab li 167 degree, yog li cov khoom yas ua los ntawm polypropylene tuaj yeem tiv taus cua sov, tiv taus corrosion, thiab tuaj yeem ua kom tsis muaj menyuam.
• Polystyrene (PShnab yas): Polymerized los ntawm styrene, nws yog xim tsis muaj xim thiab pob tshab thermoplastic uas tuaj yeem tiv taus lub iav hloov kub ntawm 100 degree. Nws feem ntau yog siv los ua cov ntim khoom pov tseg, xws li cov thawv ntim khoom noj uas siv tau pov tseg. .
• Polyvinyl chloride (PVChnab yas): Thermoplastic resin polymerized los ntawm vinyl chloride. Vinyl chloride homopolymer thiab vinyl chloride copolymer yog ob qho tib si hu ua polyethylene resin. PVC yas yuav tso cov pa phem xws li hydrogen chloride thaum raug lub teeb lossis cua sov. Thaum raug tshav ntuj ntev los yog nyob rau hauv ib puag ncig kub siab tshaj 100 degree, PVC yuav decompose rau hydrogen chloride gas thiab ntxiv nws pib-catalytically decompose nws. Yog li cov khoom siv no tsis haum rau ntim khoom noj.

Cov saum toj no yog ob peb yam khoom ntawm cov hnab yas. Feem ntau ntawm cov hnab yas siv hauv lub neej txhua hnub yog PE polyethylene hnab yas thiab PVC polyvinyl chloride hnab yas. Cov hnab yas tsis muaj xim thiab lub teeb xim PE yuav tsum siv ntau li ntau tau.