Kev faib cov ntawv pov tseg
Cov khob ntawv pov tseg tau muab faib ua khob dej txias thiab khob dej kub
Cov khob ntawv pov tseg yog cov thawv ntawv ua los ntawm cov ntoo ntoo rau hauv cov ntawv hauv paus thiab tom qab ntawd ua tiav. Feem ntau, muaj ob hom txheej txheej ntawm phab ntsa sab hauv ntawm lub khob ntawv, ib qho yog waxed ntawv khob, thiab lwm yam yog PE coated ntawv khob.
Cov kev ceev faj:
❶: Tsis txhob sib xyaw cov khob ntawv txias thiab kub.
❷: Ob lub khob ntawv tsis haum rau tuav cov dej cawv. Cawv muaj zog permeability thiab yog ib qho yooj yim ua rau to. Lub sijhawm ntev dua, qhov dej ntws ntau dua.
❸: Tsis txhob siv cov khob ntawv pov tseg ntau zaus, vim qhov tawv yuav txo qis.
01 waxed khob
Cov khob ntawv waxed yog coated nrog ib txheej ntawm cov quav ciab rau ntawm phab ntsa sab hauv ntawm lub khob ntawv kom cais cov zaub mov lossis dej haus hauv lub khob ntawv los ntawm kev sib cuag ncaj qha nrog lub thawv ntawv. Tam sim no feem ntau yog siv los ua lub khob dej txias.
Ib tug neeg ib zaug hais tias" waxed khob khob tsis tuaj yeem ntim nrog dej kub, vim tias cov wax txheej ntawm qhov chaw yuav yaj thiab sib tov rau hauv cov zaub mov, cuam tshuam kev noj qab haus huv."
Cov lus no yeej tsis muaj tseeb. Thawj qhov yuav tsum tau ua kom pom tseeb yog tias cov wax txheej coated rau sab hauv ntawm lub khob ntawv pov tseg tsis tu ncua thiab tsim nyog yog cov khoom siv uas siv tau, uas tsis muaj tshuaj lom thiab tsis muaj kuab lom hauv dej. Nws tuaj yeem raug tshem tawm thaum noj me me.
Txawm li cas los xij, lub melting point ntawm edible wax yog qhov tsawg, thiab nws yuav ruaj khov ntawm 0 ° -5 °. Txawm li cas los xij, txawm tias nws tau ntim nrog dej kub, ib qho me me ntawm cov khoom siv quav ciab tau coj mus rau hauv lub cev, yog li koj tsis' tsis tas yuav ceeb npaum li koj tsis siv' nquag.
Yog li ntawd, siv cov ntaub ntawv siv quav ciab (cov khob dej txias) los tuav cov dej qab zib kub ua rau muaj kev phom sij loj tshaj plaws. Thaum cov wax txheej maj mam yaj, lub khob lub cev softens thiab deforms thaum nws los txog rau hauv dej. Cov dej nchuav tuaj yeem hlawv koj.
02 Coated (PE) ntawv khob
Coated zaj duab xis (PE) daim ntawv khob yog coated nrog ib txheej ntawm zaj duab xis (PE) nyob rau sab hauv phab ntsa ntawm lub khob ntawv, uas yog heev du thiab muaj peev xwm ua si lub luag hauj lwm ntawm waterproof thiab roj-pov thawj. PE yog polyethylene, thiab polyethylene yog cov tshuaj muaj kev nyab xeeb tshaj plaws hauv kev ua zaub mov, uas yog qhov peb feem ntau hu ua yas.
Cov khoom siv no tsis muaj ntxhiab tsw, tsis muaj tshuaj lom, zoo li siv quav ciab, thiab muaj qhov nqus dej tsawg, yog li nws feem ntau siv los ua cov khoom siv dej tsis zoo. Nws cov ntsiab lus melting yog nyob nruab nrab ntawm 120 ° -140 °, thiab qhov kub ntawm dej yog 100 °, yog li nws yuav tsis yaj hauv dej thiab nws muaj kev nyab xeeb dua rau kev siv.
Tam sim no, feem ntau ntawm cov khob ntawv pov tseg nyob rau hauv kev ua lag luam yog ib txheej txheej coated (PE) daim ntawv khob, uas yog, tsuas yog cov phab ntsa sab hauv ntawm lub khob ntawv muaj cov zaj duab xis coated, tab sis sab nrauv phab ntsa tsis.
Yog li ntawd, nws tsis pom zoo kom siv rau cov dej haus txias vim tias nws yooj yim los tsim cov dej condensed ntawm lub khob' cov phab ntsa sab nrauv thaum tso dej txias. Cov dej condensed yuav yooj yim soften lub khob lub cev thiab txo nws cov tawv nqaij. Lub khob ntawv yog ib qho yooj yim deform thiab ua rau dej ntws.
Qhov tseeb, cov khob ntawv khob hauv khw tau poob ntau heev. Feem ntau ntawm cov khob ntawv peb pom yog coated (PE) ntawv khob. Yog tias koj xav haus cov dej kub, koj tuaj yeem yuav ib txheej txheej coated ntawv khob. Yog tias koj xav haus dej txias, nws yog qhov zoo tshaj los yuav ob-txheej coated ntawv khob. Daim ntawv khob (cov phab ntsa sab nrauv thiab sab hauv phab ntsa yog coated nrog zaj duab xis).
