Lub hnab ntim khoom yog ib txoj hauv kev kom ua tiav cov thawv ntim khoom thiab tseem yog cov thawv ntim khoom thauj khoom yooj yim. Lawv tau siv dav hauv kev thauj mus los thiab ntim cov hmoov, granular, thiab blocky khoom xws li zaub mov, nplej, tshuaj, tshuaj, thiab zaub mov. Muaj ntau ntau hom hnab ntim khoom, feem ntau yog cov hnab roj hmab-coated hnab, resin daim ntaub hnab, composite khoom bulk hnab, thiab lwm yam. Yog li, nyob rau hauv dab tsi ib puag ncig yog siv cov hnab ntim khoom? Lub hnab ntim khoom tuaj yeem tiv taus qhov kub li cas?
• Cov ntaub ntawv nyoos rau cov hnab ntim ntau
Cov hnab ntim ntau yog ua los ntawm polypropylene thiab polyethylene resins, thiab yog cov ntim yas hloov tau yooj yim nrog lub ntim tsawg dua 3m3 thiab cov kabmob hnyav ntawm tsawg dua lossis sib npaug li 3 tons.
• Polypropylene
Lub melting point yog 165 degree thiab softens ntawm ib ncig ntawm 155 degree;
Kev khiav hauj lwm kub yog -30 degree rau 140 degree .
Nws tuaj yeem tiv thaiv corrosion los ntawm acids, alkalis, ntsev tov, thiab ntau yam organic solvents hauv qab 80 degree, thiab tuaj yeem decompose nyob rau hauv qhov kub thiab txias thiab oxidation.
• Polyethylene
Melting point 85 degree mus rau 110 degree, nrog zoo heev kub tsis kam;
Kev khiav hauj lwm kub tuaj yeem ncav cuag -100 degree rau -70 degree, nrog cov tshuaj zoo ruaj khov, thiab tuaj yeem tiv taus cov kua qaub thiab alkali feem ntau (tsis tiv taus oxidizing acids)
• Lub hnab ntim khoom ua haujlwm kub?
Dab tsi yog qhov kev khiav hauj lwm kub ntawm cov thawv ntim khoom ua los ntawm polypropylene thiab polyethylene?
Raws li lub teb chaws tus qauv GB / T 10454-2000, qhov ntsuas kub ntawm lub thawv ntim yog -35 degree .
Muab lub hnab ntim rau hauv lub thawv kub tsis tu ncua ntawm -35 degree rau ntau tshaj 2h, tom qab ntawd tshem tawm cov khoom kuaj thiab quav nws 180 degrees txhawm rau xyuas seb cov khoom siv hauv paus puas puas, tawg, lossis lwm yam kev txawv txav.
Qhov ntsuas kub ntsuas kub yog 80 degree.
Siv ib lub nra ntawm 9.8 N rau ntawm daim ntawv xeem, muab tso rau hauv qhov cub 80 degree rau 1h, thiab tam sim ntawd cais ob qhov sib tshooj sib tshooj tom qab muab nws tawm los xyuas seb puas muaj lwm yam txawv txav xws li adhesion thiab tawg ntawm qhov chaw.
Raws li cov qauv ntsuas, cov hnab ntim ntau tuaj yeem siv rau hauv ib puag ncig xws li -35 degree mus rau 80 degree, tab sis nws tsis pom zoo kom siv lawv nyob rau hauv qhov chaw siab lossis qis qis rau lub sijhawm ntev.