Thaum tshav kub kub Shrink Tube txheej txheem (I)

Ua ntej, ib lub raj yas uas tsim nyog yog tsim. Tom qab ntawd, los ntawm irradiation, nws cov qauv molecular hloov (hla-txuas), endowing nws nrog "nco nyhuv". Thaum kawg, nws yog rhuab kom nthuav mus rau ib tug loj loj thiab txias rau teem. Thaum reheated, nws yuav thim rov qab mus rau nws qhov loj me.
Lub hauv paus ntsiab lus tseem ceeb: "Memory effect"
Cov "nco nyhuv" ntawm Tuoyan tshav kub shrink tubing stems los ntawm tus ntoo khaub lig-txuas txheej txheem ntawm nws cov ntaub ntawv polymer. Tsis kho cov thermoplastic yuav yaj thaum rhuab. Txawm li cas los xij, tom qab kev sib txuas ntawm - sib txuas, chemical bonds yog tsim los ntawm cov saw hlau molecular, tsim kom muaj peb - cov qauv sib txuas thiab hloov cov khoom siv rau hauv thermosetting yas. Qhov no txhais tau hais tias thaum nws rov ua kom sov dua, nws yuav tsis yaj tab sis cog lus rov qab rau cov duab teeb thaum nws hla - txuas.
Cov kauj ruam ntau lawm
Kauj Ruam 1: Yooj yim sib xyaw thiab extrusion molding
Kev npaj cov khoom siv raw: Cov ntaub ntawv tseem ceeb yog ntau yam siab -molecular polymers, feem ntau yog polyolefins (xws li polyethylene PE, polyvinyl chloride PVC). Tsis tas li ntawd, tseem muaj cov ntaub ntawv tshwj xeeb xws li polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), thiab ethylene-tetrafluoroethylene copolymer (ETFE), kom ua tau raws li qhov yuav tsum tau muaj ntawm qhov sib txawv ntawm qhov kub thiab txias thiab tshuaj tiv thaiv corrosion.
Cov khoom xyaw sib xyaw: Sib tov lub hauv paus polymer cob nrog ntau yam additives, piv txwv li:
Masterbatch: Muab xim.
Nplaim retardant: Endows heat shrink tubing nrog nplaim retardant zog (xws li UL-V0 qib).
Plasticizer: Ua kom yooj yim ntawm cov ntaub ntawv.
Stabilizer: Txhim kho kev tiv thaiv - laus thiab tiv thaiv - kev ua haujlwm ultraviolet.
Extrusion molding: Pub cov khoom siv raw khoom sib xyaw rau hauv extruder. Cov ntaub ntawv raw yog rhuab, melted thiab plasticized nyob rau hauv lub extruder, thiab ces extruded los ntawm ib lub nplhaib -zoo li tus tuag (tuag) los ua ib tug tuab - cov yeeb nkab yas uas muaj qhov ntev. Qhov no yog thawj daim ntawv ntawm lub tshav kub shrink tube. Lub sijhawm no, nws tseem tsis tau muaj cov cuab yeej ntawm cov cua sov shrinkage.
Kauj ruam 2: Cov kauj ruam tseem ceeb - Molecular cross- txuas
Qhov no yog cov kauj ruam tseem ceeb tshaj plaws nyob rau hauv endowing heat shrink tubing nrog "nco muaj nuj nqi". Feem ntau muaj ob txoj hauv kev sib txuas:
Siab -zog electron beam irradiation crosslinking (tus qauv tseem ceeb tshaj plaws):
Dhau cov yeeb nkab yas extruded los ntawm ib lub tshuab hluav taws xob accelerator.
Lub siab -cov hluav taws xob hluav taws xob hluav taws xob tawm los ntawm cov khoom siv zoo li suav tsis txheeb cov mos txwv me me, ua rau cov saw hlau molecular ntawm cov raj yas thiab rhuav tshem lawv cov khoom siv tshuaj.
Cov ntawv cog lus tawg no yuav rov sib txuas nrog ib leeg, ua ib qho peb -cov qauv sib txuas (hla- cov qauv txuas) uas txuas rau cov saw hlau molecular. Cov txheej txheem no zoo li txuas ib pawg ntawm cov noodles sib npaug (linear molecules) haphazardly nrog ntau cov hniav me me (cross-txuas kev sib txuas) los tsim ib lub network ruaj khov.