Feem ntau cov thermoplastics tuaj yeem tshuab tau los ua cov tshuab cua tshuab. Lub tshuab cua tshuab yog cov khoom siv zaj duab xis cylindrical tau los ntawm extruding cov yas rau hauv ib lub raj nyias, ces tshuab cov yas nrog compressed cua thaum nws kub, thiab ces txias thiab shaping. Qhov kev ua tau zoo ntawm cov yeeb yaj kiab no yog nruab nrab ntawm kev taw qhia zaj duab xis thiab cov yeeb yaj kiab casting: lub zog zoo dua li cov yeeb yaj kiab casting, thiab cov khoom siv hluav taws xob sib khi yog qhov phem dua li cov yeeb yaj kiab casting. Muaj ntau hom yeeb yaj kiab uas tsim los ntawm tshuab moulding, xws li low-density polyethylene (LDPE), polypropylene (PP), high-density polyethylene (HDPE), nylon (PA), ethylene vinyl acetate copolymer (EVA), thiab lwm yam. Peb yuav tham txog cov txheej txheem tshuab tshuab uas feem ntau siv qis-density polyethylene (LDPE) zaj duab xis thiab nws cov khoom siv.
Qhia luv luv txog qhov txhaum.
Xaiv cov khoom siv polyethylene tshuab zaj duab xis
1. Cov khoom siv raw uas tau xaiv yuav tsum yog cov tshuab ua cov yeeb yaj kiab qib polyethylene resin hais, uas muaj tus nqi tsim nyog ntawm tus neeg saib xyuas kom ntseeg tau tias qhov qhib ntawm zaj duab xis.
2. Lub melt index (MI) ntawm cov resin hais tsis tuaj yeem loj dhau. Yog hais tias lub melt index (MI) loj dhau lawm, lub viscosity ntawm cov molten resin yog me me heev, kev ua ntau yam yog nqaim, cov txheej txheem ua tsis yooj yim rau kev tswj, zaj duab xis tsim cov cuab yeej ntawm cov resin yog tsis yooj yim. ua cov yeeb yaj kiab; Tsis tas li ntawd, lub melt index (MI) yog loj heev, tus txheeb ze molecular hnyav tis ntawm lub polymer yog nqaim heev, thiab lub zog ntawm cov zaj duab xis yog tsis zoo. Yog li ntawd, cov ntaub ntawv raw cov ntaub ntawv nrog cov me me yaj Performance index (MI) thiab dav txheeb ze molecular hnyav faib yuav tsum raug xaiv kom ua tau raws li qhov yuav tsum tau ua ntawm zaj duab xis thiab xyuas kom meej cov yam ntxwv ntawm cov resin. Polyethylene raw cov ntaub ntawv nrog lub melt index (MI) ntawm 2-6g / 10min feem ntau yog siv rau tshuab polyethylene films.
Cov ntsiab lus tseem ceeb ntawm tshuab molding txheej txheem tswj
Cov txheej txheem ntws ntawm cua tshuab yog raws li nram no:
Hopper noj - cov khoom siv plasticization thiab extrusion → tshuab thiab traction → cua nplhaib txias → herringbone splint → traction roller traction → corona kho → zaj duab xis winding
Txawm li cas los xij, nws tsim nyog taw qhia tias qhov kev ua tau zoo ntawm cov tshuab cua tshuab muaj kev sib raug zoo nrog cov txheej txheem ntau lawm. Yog li ntawd, nyob rau hauv tus txheej txheem ntawm tshuab zaj duab xis, nws yog ib qhov tsim nyog los ntxiv dag zog rau kev tswj ntawm cov txheej txheem tsis, standardize tus txheej txheem kev khiav hauj lwm, xyuas kom meej cov khoom du thiab tau txais cov khoom zoo films.
