Dab tsi yog cork?

Cork (phellem) tsis yog ntoo tiag. Nws yog tev tawm ntawm txheej txheej ntawm cork ntoo ntoo uas yog hom ntoo qhib. Thiab Cork muaj keeb kwm txog 60 lab xyoo.

Lub ntuj kev ntxhib los mos ntawm cork tsis muaj raws nraim tib yam ob daim ntawm cork daim tawv nqaij, ua txhua yam ua hauj lwm tshwj xeeb, tag nrho nyob rau hauv txoj kab nrog rau qhov zoo tagnrho cov yam ntxwv ntawm cov khoom kim heev thiab tsis tshua muaj ntsiab lus.

Kev noj qab haus huv los tiv thaiv cork, lub npe hu ua "mos kub", cork tsis zais av lossis loj tuaj pwm, muaj suab nrov zoo, rwb thaiv tsev kub, thiab kev sib txhuam. Ntxiv rau qhov tsis muaj tshuaj lom, tsis muaj ntxhiab tsw, lub teeb, tsis yooj yim rau ntes hluav taws, thiab lwm yam. Tseem tsis muaj cov khoom siv dag zog piv rau nws.

Cork yog ib qho khoom siv uas tsis muaj zog. Nws yog phellem txheej ntawm bark ntaub so ntswg uas yog sau rau kev lag luam siv feem ntau los ntawm Quercus suber (lub cork oak), uas yog ib txwm nyob rau sab hnub poob teb chaws Europe thiab qaum teb hnub poob teb chaws Africa. Cork yog tsim los ntawm suberin, ib qho tshuaj hydrophobic. Vim nws impermeable, buoyant, elastic, thiab hluav taws-retardant zog, nws yog siv nyob rau hauv ntau yam ntawm cov khoom, feem ntau ntawm cov uas yog.wine stoppers.

Cork muaj pes tsawg leeg sib txawv nyob ntawm thaj chaw keeb kwm, huab cua thiab av, keeb kwm caj ces, tsob ntoo qhov ntev, hnub nyoog (virgin los yog reproduction), thiab kev loj hlob. Txawm li cas los xij, feem ntau, cork yog tsim los ntawm suberin (qhov nruab nrab ntawm li 40%), lignin (22%), polysaccharides (cellulose thiab hemicellulose) (18%), extractables (15%) thiab lwm yam.

Cork yog cov khoom siv ntuj tsim los ntawm tib neeg siv ntau dua 5,000 xyoo. Nws yog ib yam khoom uas nws daim ntawv thov tau paub txij thaum ancient sij hawm, tshwj xeeb tshaj yog nyob rau hauv floating li thiab li

nresrau cov dej haus, feem ntau yog cawv, uas nws lub lag luam, txij li thaum ntxov xyoo pua nees nkaum, muaj kev nthuav dav loj, tshwj xeeb tshaj yog vim muaj ntau yam cork raws li agglomerates.

Kev lag luam cork feem ntau suav tias yog ib puag ncig tus phooj ywg. Cork ntau lawm feem ntau suav tias yog kev ruaj khov vim tias tsob ntoo cork tsis raug txiav kom tau cork; tsuas yog cov tawv tawv yog stripped kom sau lub cork. Tsob ntoo tseem nyob thiab loj hlob. Kev ruaj khov ntawm kev tsim khoom thiab kev rov ua dua tshiab ntawm cov khoom siv cork thiab cov khoom lag luam yog ob qho ntawm nws qhov tshwj xeeb tshaj plaws.

Cork's elasticity ua ke nrog nws qhov ze-impermeability ua rau nws haum raws li cov khoom siv raulub raj mis stoppers, tshwj xeeb tshaj yog rau cov raj mis cawv.Cork stopperssawv cev txog 60% ntawm tag nrho cov khoom siv cork. Cork muaj qhov yuav luag xoom Poisson tus piv, uas txhais tau hais tias lub vojvoog ntawm lub cork tsis hloov pauv loj thaum nyem lossis rub.

Cork yog cov khoom siv gasket zoo heev. Qee cov carburetor ntab lub tais gaskets yog ua los ntawm cork, piv txwv li.

Cork kuj tseem yog ib qho tseem ceeb hauv kev tsim cov ntaus pob tesniv shuttlecocks.

Cork's npuas-form qauv thiab ntuj hluav taws kub retardant ua rau nws haum rau acoustic thiab thermal rwb thaiv tsev nyob rau hauv lub tsev phab ntsa, pem teb, ceilings, thiab facades. Cov khoom los ntawm cov khoom lag luam muaj txiaj ntsig ntau dua, corkboard, tau txais kev muaj koob npe raws li cov khoom tsis haum, yooj yim-rau-kawg thiab muaj kev nyab xeeb rau lwm cov khoom siv hluav taws xob petrochemical.

Cov nplooj ntawv ntawm cork, kuj feem ntau yog cov khoom siv los ntawm kev tsim khoom, yog siv los ua cov ntawv xov xwm nrog rau hauv pem teb thiab phab ntsa.