Yas feem ntau siv hauv peb lub neej txhua hnub. Los ntawm cov hnab yas, lub raj mis mis, lub raj mis dej haus, lub thawv noj su thiab hnab yas, mus rau zaj duab xis ua liaj ua teb, rooj tog zaum, khoom siv hluav taws xob, 3D luam ntawv, thiab txawm tias foob pob hluav taws thiab cuaj luaj, cov yas tau tshwm sim.
Yas yog ib ceg tseem ceeb ntawm cov ntaub ntawv organic polymer, muaj ntau yam, cov zis loj thiab siv dav. Rau ntau hom plastics, lawv tuaj yeem faib raws li hauv qab no:
1. Raws li tus cwj pwm thaum rhuab, cov yas tuaj yeem muab faib ua thermoplastic thiab thermosetting science;
2. Raws li cov tshuaj tiv thaiv ntawm resin synthesis nyob rau hauv plastics, resins yuav muab faib ua polymeric plastics thiab polycondensation plastics;
3. Raws li lub xeev txiav txim ntawm resin macromolecules, cov yas tuaj yeem muab faib ua amorphous plastics thiab crystalline plastics;
4. Raws li daim ntawv thov kev ua haujlwm ntawm theem kev ua haujlwm, cov yas tuaj yeem muab faib ua cov yas dav dav, engineering plastics thiab cov yas tshwj xeeb.
Ntawm lawv, cov yas dav dav yog cov khoom siv dav tshaj plaws hauv peb lub neej txhua hnub. Plastics lub hom phiaj dav dav hais txog cov yas uas muaj cov ntim ntau lawm, cov khoom siv dav dav, tus nqi qis thiab tsim nyog rau ntau daim ntawv thov. Lub hom phiaj dav dav yas muaj cov txheej txheem molding zoo, thiab cov khoom siv nrog ntau yam tuaj yeem tsim los ntawm ntau yam txheej txheem. Cov khoom siv dav dav muaj xws li polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile / butadiene / styrene (ABS).
Lub sijhawm no, kuv yuav tham txog cov khoom tseem ceeb thiab kev siv polyethylene (PE). Polyethylene (PE) muaj kev ua haujlwm zoo thiab kev pabcuam kev ua haujlwm. Nws yog qhov siv ntau tshaj plaws hauv cov khoom siv hluavtaws, thiab nws cov peev txheej tsim tau yog thawj zaug ntawm txhua hom yas rau lub sijhawm ntev. Polyethylene resin feem ntau suav nrog tsawg ntom polyethylene (LDPE), linear low density polyethylene (LLDPE) thiab high density polyethylene (HDPE).
Polyethylene yog dav siv nyob rau hauv Suav teb. Zaj duab xis yog nws cov neeg siv loj tshaj plaws, siv li 77 feem pua ntawm cov polyethylene tsawg thiab 18 feem pua ntawm cov polyethylene high-density. Tsis tas li ntawd, txhaj tshuaj molded khoom, xov hlau thiab cables thiab cov khoom hollow account rau ib tug loj feem ntawm nws cov qauv siv. Ntawm tsib cov resins, kev noj ntawm PE yog thawj. Polyethylene tuaj yeem tshuab moulded los ua txhua yam ntawm lub raj mis, cov kaus poom, cov tso tsheb hlau luam, cov thoob thiab lwm yam ntim khoom; Txhaj tshuaj molding tsim txhua yam ntawm cov lauj kaub, thoob, pob tawb, pob tawb thiab lwm yam ntim txhua hnub, txhua hnub sundries thiab rooj tog; Extrusion molding tsim txhua yam ntawm cov kav dej, khi txoj siv sia, fibers, monofilaments, thiab lwm yam. Tsis tas li ntawd, nws tseem tuaj yeem siv los tsim cov ntaub ntawv txheej thiab cov ntawv hluavtaws rau cov xov hlau thiab cables. Hauv ntau daim ntawv thov, ob qhov kev siv tseem ceeb ntawm polyethylene yog cov yeeb nkab thiab zaj duab xis. Nrog rau kev tsim kho hauv nroog, kev ua yeeb yaj kiab ua liaj ua teb thiab ntau yam khoom noj, textile thiab kev lag luam ntim khoom lag luam, kev txhim kho ntawm ob txoj haujlwm no kuj muaj ntau thiab ntau dua.
