14mm Strand hun Bamboo Flooring

Apejuwe kukuru:

1) Awọn ohun elo: 100% aise oparun
2) Awọn awọ: Strand hun
3) Iwọn: 1840*126*14mm/ 960*96*15mm
4) Akoonu ọrinrin: 8%-12%
5) itujade formaldehyde: Titi di idiwọn E1 ti Yuroopu
6) Oriṣiriṣi: Treffert


Apejuwe ọja

Ifihan awọ

Fifi sori ẹrọ

Ilẹ Bamboo Carbonized

ọja Tags

Pakà Bamboo Carbonized

Carbonized-Bamboo-Floor

Bii o ṣe le yan Ilẹ Bamboo Lilefoofo?

Yan Ilẹ Bamboo Lilefoofo ti o dara julọ fun ile rẹ, o nilo lati mọ bi o ṣe yan.

Ni isalẹ ni diẹ ninu awọn imọran ọjọgbọn:

1. First wo ni oju:
Ko si awọn nyoju ninu awọ naa, boya o jẹ tuntun ati didan, boya awọn isẹpo oparun ti dudu ju, ati boya awọn laini lẹ pọ lori ilẹ (ọkọọkan ni aṣọ kan ati laini taara, ilana ṣiṣe ẹrọ ko dara, ooru. titẹ ti wa ni ko ṣẹlẹ nipasẹ miiran idi) ati ki o si ṣayẹwo boya nibẹ ni o wa dojuijako ni ayika , Boya nibẹ ni o wa eyikeyi wa ti eeru.Bóyá ó mọ́ tónítóní, kí o sì wò ó bóyá oparun èyíkéyìí wà lẹ́yìn rẹ̀, àti bóyá ó mọ́ tónítóní.Lẹhin kika ohun gbogbo, a nilo lati ṣayẹwo awọn ọja lati rii boya iyatọ eyikeyi wa laarin apẹẹrẹ ati ọja gangan.Ohun kan ti o kẹhin jẹ fifi sori ẹrọ.Ti o ba nilo lati lu keel, o jẹ nipa 30 cm ni ibamu pẹlu bošewa.Awọn boṣewa awo nilo mẹrin keels.

2.Wo awọn ẹya:
Iyatọ awọ jẹ kekere, nitori radius idagba ti oparun kere pupọ ju ti awọn igi lọ, ati pe ko ni ipa pataki nipasẹ imọlẹ oorun, ati pe ko si iyatọ ti o han gbangba laarin yin ati Yang.Nitorinaa, ilẹ oparun ni awọn ilana oparun ọlọrọ, ati pe awọ jẹ aṣọ;líle dada tun jẹ ọkan ninu awọn ilẹ oparun.anfani.Nítorí pé ilẹ̀ oparun jẹ́ ìgbékalẹ̀ ọ̀gbìn tí ó gbóná, líle àdánidá rẹ̀ ju ìlọ́po méjì ti igi lọ, kò sì rọrùn láti di àbùkù.Igbesi aye iṣẹ imọ-jinlẹ jẹ to ọdun 20.Ni awọn ofin ti iduroṣinṣin, ilẹ bamboo n dinku ati gbooro kere ju ilẹ-igi to lagbara.Ṣugbọn ni awọn ofin ti agbara gangan, ilẹ bamboo tun ni awọn ailagbara: delamination yoo waye labẹ ipa ti oorun ati ọriniinitutu.Nitori ooru ti o ga julọ ati iwuwo giga, ooru rẹ kii yoo padanu ni igba otutu.Nitorinaa, ilẹ bamboo ni iṣẹ ṣiṣe ti mimu gbona.

3.Wo aabo ayika:
Fun ilẹ-ilẹ laminate, ami pataki julọ fun aabo ayika ilẹ ni iye formaldehyde ti a tu silẹ.Nipa aropin ti awọn iṣedede itujade formaldehyde, aabo ayika ni ile-iṣẹ ilẹ ti ni iriri awọn iyipada imọ-ẹrọ mẹta ti E1, E0, ati FCF.Ni ipele ibẹrẹ, boṣewa itujade formaldehyde ti awọn panẹli orisun igi jẹ E2 (ijadejade formaldehyde ≤30mg/100g), ati pe opin itujade formaldehyde jẹ alaimuṣinṣin pupọ.Paapaa ti o ba jẹ ọja ti o pade boṣewa yii, akoonu formaldehyde rẹ le kọja E1 atọwọda Die e sii ju iwọn mẹta lọ ti igbimọ naa, ti o lewu ilera eniyan ni pataki, nitorinaa o ko gbọdọ lo fun ọṣọ ile.Nitorinaa, iyipada aabo ayika akọkọ wa.Ninu iyipada aabo ayika yii, ile-iṣẹ ilẹ ti ṣe imuse boṣewa aabo ayika E1, iyẹn ni, itujade formaldehyde jẹ ≤1.5㎎/L.Botilẹjẹpe ipilẹ ko ṣe eewu si ara eniyan, awọn iṣẹku tun wa ni ilẹ.Ọpọlọpọ formaldehyde ọfẹ.Ile-iṣẹ ilẹ ti bẹrẹ iyipada aabo ayika keji, ati ṣafihan boṣewa aabo ayika E0, eyiti o dinku itujade formaldehyde ti ilẹ si 0.5㎎/L.

4.Wo didara
Ilẹ-ilẹ ti o dara yẹ ki o yan ohun elo ti o dara, ohun elo ti o dara yẹ ki o jẹ adayeba, giga ati iwọntunwọnsi.Diẹ ninu awọn eniyan ro pe iwuwo giga ti awọn paneli ti o da lori igi, dara julọ.Ni otitọ, kii ṣe bẹ.Iwuwo ti o ga ju ni oṣuwọn wiwu omi ti o ga, eyiti o le fa awọn iyipada iwọn ni irọrun ati ja si abuku ilẹ.Ni ẹẹkeji, o jẹ dandan lati gbarale awọn laini iṣelọpọ ilẹ ti ilọsiwaju ati ohun elo ati imọ-ẹrọ to muna lati ṣe agbejade ilẹ-ile akọkọ.

Ilana

bamboo-flooring-contructure
bamboo-types

Adayeba Bamboo Flooring

natural-bamboo-flooring

Ilẹ Bamboo Carbonized

Carbonized-Bamboo-Flooring

Adayeba Carbonized Bamboo Floor

natural-Carbonized-Bamboo-Floor

Bamboo Flooring Anfani

BAMBOO-FLOORING-ADVANTAGE

Awọn alaye Awọn aworan

18mm-Bamboo-Flooring
20mm-Bamboo-Flooring
15mm-Bamboo-Floor-Natural
Bamboo-Floor-Natural

Oparun Flooring Data Imọ

1) Awọn ohun elo: 100% aise oparun
2) Awọn awọ: Strand hun
3) Iwọn: 1840*126*14mm/ 960*96*15mm
4) Akoonu ọrinrin: 8%-12%
5) itujade formaldehyde: Titi di idiwọn E1 ti Yuroopu
6) Oriṣiriṣi: Treffert
7) Epo: Dynea
8) Didan: Matt, olomi didan
9) Apapọ: Ahọn & Groove (T&G) tẹ;Unilin + Ju tẹ
10) Agbara ipese: 110,000m2 / osu
11) Iwe-ẹri: Ijẹrisi CE, ISO 9001:2008, ISO 14001:2004
12) Iṣakojọpọ: Awọn fiimu ṣiṣu pẹlu apoti paali
13) Akoko Ifijiṣẹ: Laarin awọn ọjọ 25 lẹhin ti o gba owo iṣaaju

Tẹ System Wa

A: T&G Tẹ

1

T & G titiipa BAMBOO-Bamboo Florinig

2

Bamboo T & G - oparun Florinig

B: Ju silẹ (ẹgbẹ kukuru)+ Unilin tẹ (ẹgbẹ ipari)

drop-Bamboo-Florinig

silẹ Bamboo Florinig

unilin-Bamboo-Florinig

unilin Bamboo Florinig

Oparun ti ilẹ package akojọ

Iru Iwọn Package KO Pallet / 20FCL Pallet/20FCL Iwọn ti Apoti GW NW
Oparun Carbonized 1020 * 130 * 15mm 20pcs/ctn 660 ctns / 1750.32 sqm 10 plt, 52ctns/plt,520ctns/1379.04 sqms 1040*280*165 28kgs 27kgs
1020*130*17mm 18pcs/ctn 640 ctns / 1575.29 sqm 10 plt, 52ctns/plt,520ctns/1241.14 sqms 1040*280*165 28kgs 27kgs
960*96*15mm 27pcs/ctn 710 ctns / 1766.71 sqm 9 plt, 56ctns/plt,504ctns/1254.10 sqms 980*305*145 26kgs 25kgs
960*96*10mm 39pcs/ctn 710 ctns / 2551.91 sqm 9 plt, 56ctns/plt,504ctns/1810.57 sqms 980*305*145 25kgs 24kgs
Strand hun Bamboo 1850*125*14mm 8pcs/ctn 672 ctn, 1243.2sqm 970*285*175 29 kg 28 kg
960*96*15mm 24pcs/ctn 560 ctn, 1238.63sqm 980*305*145 26 kg 25 kg
950*136*17mm 18pcs/ctn 672ctn, 1562.80sqm 970*285*175 29 kg 28kg

Iṣakojọpọ

Iṣakojọpọ Dege Brand

DEGE-BAMBOO-FLOOR
DEGE-Horizontal-Bamboo-Floor
DEGE-BAMBOO-FLOORING
DEGE-Carbonized-Bamboo-Floor
bamboo-flooring-WAREHOUSE

Apoti gbogbogbo

Strand-Woven-Bamboo-Flooring-package
carton-bamboo-flooring
bamboo-flooring-package
bamboo-flooring-cartons

Gbigbe

bamboo-flooring-load
bamboo-flooring-WAREHOUSE

Ilana ọja

bamboo-flooring-produce-process

Awọn ohun elo

strand-woven-bamboo-flooring
brown-Strand-Woven-Bamboo-Flooring
champagne-Strand-Bamboo-Flooring
natural-Strand-Woven-Bamboo-Flooring
bamboo-flooring-for-indoor
Coffee-Rustic-Bamboo-Floor
dark-Strand-Woven-Bamboo-Flooring
15mm-Strand-Woven-Bamboo-Flooring
teak-Strand-Bamboo-Flooring

  • Ti tẹlẹ:
  • Itele:

  • about17Bawo ni a ṣe fi ilẹ bamboo sori ẹrọ (ẹya alaye)

      Bamboo igi pakà fifi sorini ko Elo yatọ si lati boṣewa igilile pakà fifi sori.Fun awọn oniwun ile, iwuri akọkọ fun ṣiṣe fifi sori ilẹ igi oparun ni lati ṣafipamọ owo.O le fi sori ẹrọ ni idaji iye owo nipa ṣiṣe funrararẹ.Fifi sori ilẹ oparun le jẹ iṣẹ akanṣe ìparí ti o rọrun.
    Awọn ilana ipilẹ:Ṣaaju fifi sori ẹrọ eyikeyi ti ilẹ, o yẹ ki o rii daju pe aaye iṣẹ ati ilẹ-ilẹ pade awọn ibeere pataki.Awọn igbesẹ pataki ni fifi sori ẹrọ waye ṣaaju fifi si ilẹ oparun. Eyi ni awọn itọnisọna diẹ:
    Igbesẹ akọkọ ni fifi sori ilẹ igi oparun ni ṣiṣe idaniloju pe ilẹ-ilẹ jẹ:
    √ Ohun igbekalẹ
    √ Mọ: Ti fo ati laisi idoti, epo-eti, girisi, kun, awọn edidi, ati awọn adhesives atijọ ati bẹbẹ lọ
    √ Gbẹ: Ilẹ-ilẹ gbọdọ wa ni gbẹ ni gbogbo ọdun, ati
    √ Awọn adhesives ipele ko darapọ daradara pẹlu awọn ilẹ abẹlẹ idọti ati pe yoo fa ibajẹ nikẹhin, ti o ba tutu.Ti ko ba si ni ipele, ilẹ oparun yoo kigbe nigbati o ba rin lori.
    √ Yọ eyikeyi awọn eekanna atijọ tabi awọn opo lati awọn ohun elo ilẹ ti iṣaaju.
    √ Ṣayẹwo plank ilẹ kọọkan fun ite, awọ, ipari, didara ati awọn abawọn.
    √ Ṣe iwọn ilẹ ki o pin nipasẹ nọmba awọn igbimọ.
    √ Fi ipilẹ ilẹ silẹ fun yiyan wiwo.
    Ibi iṣọra ti awọ ati ọkà yoo mu ẹwa ti ilẹ-ilẹ ti o pari.
    √ Ohun elo ilẹ gbọdọ wa ni ipamọ ni aaye fifi sori ẹrọ o kere ju awọn wakati 24-72 ṣaaju.Eyi gba aaye laaye lati ṣatunṣe si iwọn otutu yara ati ọriniinitutu.
    √ Maṣe fipamọ taara sori kọnkita tabi nitosi awọn odi ita.
    √ Nigbati o ba n ra ilẹ-ilẹ, ṣafikun 5% si aworan onigun mẹrin gangan ti o nilo fun fifun gige.
    √ Ti o ba n gbe ilẹ oparun sori itan keji, lẹhinna ṣaaju lilo nailer/stapler, akọkọ yọ awọn imuduro ina kuro lati awọn aja ni isalẹ.Awọn stapler yoo kan titẹ lori awọn joists ati ki o le tú aja-agesin amuse ni isalẹ.
    √ Eyikeyi iṣẹ ti o kan omi tabi ọrinrin yẹ ki o ṣee ṣe ṣaaju fifi sori ilẹ igi oparun.Iwọn otutu yara ti 60-70°F ati ipele ọriniinitutu ti 40-60% ni a gbaniyanju.
    Akiyesi pataki:Ilẹ-igi oparun yẹ ki o jẹ ohun ti o kẹhin ti a fi sori ẹrọ fun iṣẹ-ṣiṣe titun tabi atunṣe.Paapaa, fi sori ẹrọ ilẹ fun awọn itọnisọna olupese lati daabobo atilẹyin ọja rẹ.
    Awọn irinṣẹ fifi sori ẹrọ:
    √ Teepu Idiwọn
    √ Handsaw (apapọ agbara tun ṣe iranlọwọ)
    √ Idina kia kia (nkan ti ilẹ ti a ge)
    √ Igi tabi ṣiṣu alafo (1/4 ″)
    √ Pẹpẹ ẹyẹ tabi igi fa
    √ Hammer
    √ Laini chalk
    √ Ikọwe
    Fun fifi sori eekanna, iwọ yoo tun nilo:
    √ Ibon eekanna ti o yẹ igi lile
    √ Aworan ohun elo eekanna Fun fifi sori ẹrọ lẹ pọ, iwọ yoo tun nilo:
    √ alemora ilẹ ti a fọwọsi
    √ alemora trowel
    Fun fifi sori lilefoofo loju omi, iwọ yoo tun nilo:
    √ 6-mil poli film foam underlayment
    √ PVAC lẹ pọ
    √ teepu poly tabi teepu duct
    Awọn ilana fifi sori ẹrọ tẹlẹ:
    √ Lati jẹ ki ilẹ ti o baamu nisalẹ, awọn apoti ilẹkun yẹ ki o wa labẹ ge tabi akiyesi jade.
    √ Bi igi ṣe n gbooro pẹlu ilosoke ninu ipele ọrinrin, aaye imugboroja 1/4 ″ yẹ ki o fi silẹ laarin ilẹ ilẹ ati gbogbo awọn odi ati awọn nkan inaro (gẹgẹbi awọn paipu ati awọn apoti ohun ọṣọ).Eyi yoo bo lakoko isọdọtun ti awọn apẹrẹ ipilẹ ni ayika yara naa.Lo igi tabi awọn alafo ṣiṣu lakoko fifi sori ẹrọ lati ṣetọju aaye imugboroja yii.
    √ Nigbagbogbo lo bulọki kia kia ati òòlù lati fa awọn pákó papọ.Idina kia kia ki o lo lodi si ahọn nikan, kii ṣe lodi si iho ti plank.
    √ Nigbagbogbo bẹrẹ ila kọọkan lati ẹgbẹ kanna ti yara naa.
    √ A le lo ẹyẹ kuro tabi ọpa fifa lati tii awọn isẹpo ipari nitosi odi kan.
    √ Ṣọra ki o maṣe ba eti ilẹ-ilẹ jẹ.
    Bibẹrẹ:Fun irisi ti o dara julọ, ilẹ-ilẹ igi oparun nigbagbogbo ni afiwe si ogiri ti o gunjulo tabi odi ita, eyiti o jẹ deede julọ ati pe o dara fun gbigbe laini iṣẹ taara.Itọsọna ti awọn planks yẹ ki o da lori ifilelẹ ti yara ati awọn ipo ti awọn ẹnu-ọna ati awọn window.Awọn ori ila diẹ (ko si lẹ pọ tabi eekanna) le jẹ gbẹ-gbe ṣaaju ki o to bẹrẹ fifi sori lati jẹrisi ipinnu ipilẹ rẹ ati laini iṣẹ.Ti yara naa ba ti ṣetan fun fifi sori ẹrọ, ati pe gbogbo awọn ohun elo ati awọn irinṣẹ wa, DIYer kan ti o ni iriri diẹ ninu ilẹ le nireti lati fi sii nipa awọn ẹsẹ ẹsẹ 200 ni ọjọ kan.Ilana fifi sori ẹrọ: Awọn ọna ti o wọpọ mẹta lo wa fun fifi sori ilẹ igi oparun: Naildown, gluedown ati lilefoofo.
    1. IKANKAN tabi IKANKAN ASIRI:Ni ọna yii, ilẹ oparun ti wa ni 'ni ikoko' ti a kan mọ si ilẹ abẹlẹ igi kan.O jẹ ọna ibile ti fifi sori ilẹ igi oparun nipa lilo eekanna tabi awọn opo.Gbogbo ilẹ-ilẹ ti o lagbara ati ọpọlọpọ awọn ilẹ ipakà le fi sii ni ọna yii.Awọn joists ilẹ (awọn opo atilẹyin ilẹ) gbọdọ wa ni samisi lati ṣe itọsọna ilana fifi sori ẹrọ.Paapaa, ipo ti awọn joists ilẹ yẹ ki o samisi lori iwe rilara pẹlu awọn laini chalk.Awọn isamisi wọnyi yoo ṣe idanimọ ibi ti awọn eekanna ati awọn opo yẹ ki o wakọ lati ṣe asopọ ti o lagbara pẹlu ilẹ-ilẹ.Awọn eekanna tabi awọn itọpa ti wa ni igun kan nipasẹ ahọn ati pe o farapamọ nipasẹ nkan ilẹ ti o tẹle.Ìdí nìyí tí wọ́n fi ń pè é ní 'afọ́jú tàbí ìkọ́ ìkọ̀kọ̀.'Pa awọn igbimọ kọọkan ni gbogbo 8 ″ ati laarin 2 ″ ti opin kọọkan.Ni kete ti a ba gbe awọn ori ila ibẹrẹ, awọn planks ti o tẹle yẹ ki o kan mọ taara loke ahọn ni igun 45o.Eekanna oju le nilo ni awọn ẹnu-ọna tabi awọn agbegbe wiwọ nibiti eekanna ko le baamu.Awọn ori ila meji ti o kẹhin yoo tun ni lati kan si oju ni ọna kanna.Oju ti o dara yẹ ki o wa ni pa lori àlàfo / staple ilaluja.
    2. NIPA NIPA:Ọna yii jẹ pẹlu gluing ti ilẹ oparun si ilẹ abẹlẹ kan.Ilẹ igi lẹ pọ-isalẹ ti fi sori ẹrọ ni ọna ti o jọra bii ti tile ti ilẹ.O le ṣee lo fun fifi sori ẹrọ lori awọn ilẹ ipakà nja mejeeji ati lori itẹnu.Ilẹ-ilẹ ti iṣelọpọ le ṣee fi sori ẹrọ ni lilo awọn ọna lẹ pọ-isalẹ ti o jọra.Oparun ilẹ le ti wa ni lẹ pọ si isalẹ nipa lilo ọrinrin sooro ilẹ alemora (paapa urethane iru).Ka awọn itọnisọna alemora daradara fun iwọn trowel to dara ati akoko ṣeto alemora.Adhesives orisun omi ko yẹ ki o lo fun idi eyi.Paapaa, maṣe lo ọna “isunmọ tutu” tabi “loose lay” ti fifi sori ẹrọ.Bẹrẹ pẹlu ogiri ita ati tan kaakiri bi alemora bi o ṣe le bo nipasẹ ilẹ ni wakati 1.Lẹhin lilo alemora si ilẹ-ilẹ pẹlu trowel kan, awọn pákó ilẹ oparun yẹ ki o gbe lẹsẹkẹsẹ pẹlu yara ti nkọju si odi.Gba laaye fun afẹfẹ agbelebu deedee lakoko ilana naa.Rii daju pe ilẹ tun wa ni deede ati ṣọra lati ma jẹ ki ilẹ ti a fi sori ẹrọ gbe lori alemora tutu.Lo asọ ọririn lati yọkuro lẹsẹkẹsẹ eyikeyi alemora ti o wa lori ilẹ ilẹ.Rin lori ẹsẹ ẹsẹ-ẹsẹ laarin awọn iṣẹju 30 ti fifi ilẹ silẹ lati rii daju asopọ ti o lagbara pẹlu alemora.Awọn pẹlẹbẹ ilẹ lori laini ala ti yara le nilo iwuwo fun iwe adehun yii.
    3. IPILE LIFE:Ilẹ-ilẹ lilefoofo kan ti so mọ ararẹ kii ṣe si ilẹ abẹlẹ.O ti fi sori ẹrọ lori ọpọlọpọ awọn oriṣi ti abẹlẹ timutimu.Ọna yii dara pẹlu eyikeyi ilẹ-ilẹ ati pe a ṣe iṣeduro ni pataki fun ooru gbigbona tabi awọn fifi sori ẹrọ ni isalẹ.Awọn ẹrọ ti o gbooro nikan tabi awọn ọja ply agbelebu yẹ ki o gbero fun lilefoofo.Ọna yii pẹlu gluing ahọn ati awọn isẹpo iho ti ilẹ ilẹ oparun papọ lori abẹlẹ.Bẹrẹ ila akọkọ pẹlu yara si odi.Lẹ pọ-ipin awọn isẹpo ti ila akọkọ nipa lilo alemora si isalẹ ti yara.Dubulẹ awọn ori ila ti o tẹle ti ilẹ-ilẹ nipa lilo lẹ pọ si ẹgbẹ ati awọn isẹpo ipari ati awọn planks ti o ni ibamu pẹlu titẹ ni kia kia.
    Itoju Lẹhin fifi sori ẹrọ:
    √ Yọ awọn alafo imugboroja kuro ki o tun fi ipilẹ sori ẹrọ ati/tabi awọn apẹrẹ yika mẹẹdogun lati bo aaye imugboroja naa.
    √ Maṣe gba laaye ijabọ ẹsẹ tabi ohun-ọṣọ eru lori ilẹ fun wakati 24 (ti o ba lẹ pọ-isalẹ tabi lilefoofo).
    √ Ekuru mop tabi igbale ilẹ rẹ lati yọkuro eyikeyi idoti tabi idoti.

    spec

     

    about17Pẹpẹ pẹtẹẹsì

    20140903092458_9512 20140903092459_4044-(1) 20140903092459_4044 20140903092459_6232

    20140903092500_0607

    20140903092500_3732

    20140903092500_6701

    about17Arinrin oparun pakà awọn ẹya ẹrọ

    4 7 jian yin

    20140904084752_2560

    20140904085502_9188

    20140904085513_8554

    20140904085527_4167

    about17Awọn ẹya ẹrọ ilẹ oparun ti o wuwo

    4 7 jian T ti

    20140904085539_4470

    20140904085550_6181

    Iwa Iye Idanwo
    Ìwúwo: +/- 1030 kg / m3 EN 14342:2005 + A1:2008
    Lile Brinell: 9.5 kg/mm² EN-1534:2010
    Akoonu ọrinrin: 8.3% ni 23°C ati 50% ọriniinitutu ojulumo EN-1534:2010
    Kilasi itujade: Kilasi E1 (LT 0,124 mg/m3, EN 717-1) EN 717-1
    Iyatọ wiwu: 0.17% pro 1% iyipada ninu akoonu ọrinrin EN 14341:2005
    Idaabobo abrasion: 16.000 yipada EN-14354 (12/16)
    Agbara titẹ: 2930 kN/cm2 EN-ISO 2409
    Idaabobo ipa: 6 mm EN-14354
    Awọn ohun-ini ina: Kilasi Cfl-s1 (EN 13501-1) EN 13501-1
    Kọ ifiranṣẹ rẹ nibi ki o si fi si wa

    Awọn ọja ti o jọmọ