Txij li thaum cov khoom tau qhia thiab siv hauv Suav teb xyoo 2000, nws txoj kev xav tau ntawm kev lag luam tau nthuav dav sai. Hauv xyoo 2009, kev siv txhua xyoo hauv kev tsim kho hauv lub tebchaws tau tshaj 80 lab cov kaus poom. Nrog rau cov kev xav tau ntau ntxiv rau kev tsim vaj tsev zoo thiab kev txhawb nqa lub zog-kev txuag thiab kev siv- txo cov tsev, kev siv cov khoom lag luam no tseem yuav loj hlob mus ntxiv rau yav tom ntej.
Cov tuam txhab tsim khoom hauv tsev tau ua tiav cov qauv thiab cov tshuab tsim khoom ntawm cov khoom lag luam no, thiab feem ntau siv tsis yog -ozone- depleting fluorinated foaming agents. Lawv kuj tau tsim cov khoom ua ntej-foaming. Tsuas yog qee cov tuam txhab lag luam uas tseem siv cov fittings txawv teb chaws, lwm cov khoom siv txhawb nqa tau tsim hauv tsev.
Nco tseg:
Ua ntej-foaming txhais tau hais tias 80% ntawm polyurethane foaming tus neeg sawv cev twb foamed tom qab txau, thiab tom qab foaming yog me me heev. Qhov no tso cai rau cov neeg ua haujlwm tau yooj yim tswj lub zog thaum siv rab phom ua npuas ncauj, ua kom yooj yim, yooj yim, thiab tsis muaj kua nplaum. Post-foaming txhais tau hais tias cov kua nplaum maj mam ua tuab dua tom qab txau, ob peb zaug tuab dua li thaum thawj zaug txau. Qhov no ua rau nws nyuaj rau cov neeg ua haujlwm los tswj lub zog thaum rub tus taw, yooj yim nkim kua nplaum, tsawg kawg yog 1/3 ntawm nws. Tsis tas li ntawd, tus ncej - nthuav cov kua nplaum, tom qab kho, tuaj yeem ua rau lub qhov rooj thiab qhov rais yooj yim puas, zoo li cov kua nplaum zoo tib yam los ntawm kev ua lag luam.