Me pēhea te whiriwhiri i te mata kani tapahi papa sima muka tika

Kua noho te papa sima muka (FCB) hei rauemi matua mō te hanga whare nā tōna kaha nui, tōna ātete ahi, tōna ātete makuku, me tōna roa. Heoi, ko tōna hanganga ahurei—te whakaranu i te sima Portland, ngā muka rakau, te onepu silica, me ngā tāpiringa—he wero nui i te wā tapahi: he pakarukaru nui (he ngawari ki te pakaru te taha), he nui te ihirangi silica (te whakaputa puehu silica tioata ka taea te manawa, he tūponotanga hauora e whakahaeretia ana e OSHA 1926.1153), me ngā āhuatanga whakakoi (te whakateretere i te kakahu o te mata kani). Mō ngā kaihanga, ngā kaimahi kirimana, me ngā kaihanga, ko te whiriwhiri i te mata kani tika ehara i te mea ko te whakarite i te pai me te kounga o te tapahi anake; engari ko te whakatutuki i ngā paerewa haumaru, te tiaki i te hauora o ngā kaimahi, me te karo i te kino o ngā taputapu.

Ka wetewetehia e tēnei tuhinga te tukanga whiriwhiri mā te tātari i te rauemi tapahi (FCB), ngā whakatakotoranga o te mata kani, ngā taputapu taurite, ngā tikanga whakaputa, me ngā horopaki tono—e hangai katoa ana ki ngā whakaritenga o ngā paerewa silica tioata manawa a OSHA me ngā mahi pai rawa atu o te ahumahi.

2. Tātaritanga o te Rauemi Tapahia: Ngā Āhuatanga o te Papa Sima Muka (FCB)

Ko te taahiraa tuatahi i te whiriwhiri i te mata kani ko te mārama ki ngā āhuatanga o te rauemi, nā te mea ka whakatau tika mai ngā āhuatanga o te rauemi i te mahi e hiahiatia ana mō te mata kani.

2.1 Ngā Wero o te Hanganga Matua me te Tapahi

Ko te tikanga, ko te 40-60% o te sima Portland (hei whakarato i te kaha), 10-20% o ngā muka rakau (hei whakarei ake i te pakari), 20-30% onepū silica (hei whakapai ake i te mātotoru), me ētahi tāpiringa iti (hei whakaiti i te pakaru). E toru ngā wero tapahi matua ka puta mai i tēnei hanganga:

• Te whakaputanga puehu silicaKa tukuna e te onepu silica i roto i te FCB te puehu silica tioata ka taea te manawa i te wā e tapahi ana. E whakahau ana a OSHA 1926.1153 i te whakahaere puehu tino kaha (hei tauira, ngā pūnaha hauhautanga ā-rohe/LEV), nō reira me hototahi te mata kani ki ngā taputapu kohikohi puehu hei whakaiti i te putanga puehu.
• Te pakarukaru me te pakaru o te tahaHe pakarukaru te anga sima-onepu, engari he paku ngāwari ake ngā muka rakau. Mēnā kāore i te ōrite te kaha tapahi, te hoahoa niho kani rānei, ka ngawari te pakaru o ngā taha, ka pā ki te tāutanga me te kounga ataahua o te papa.
• Te pakūHe mea whakakoi te onepū silica, e tere ake ai te pakaru o te mata kani. Me tino ātete te anga o te mata kani me te rauemi niho ki te pakaru kia roa ai te ora o te mahi.

2.2 Ngā Āhuatanga Ā-tinana e Pā Ana ki te Kōwhiringa o te Mata Kani

• KiatoKo te mātotorutanga FCB kei waenga i te 1.2 ki te 1.8 g/cm³. Ko ngā papa mātotorutanga teitei ake (hei tauira, ngā panera pakitara o waho) me whakamahi i ngā mata kani me ngā rauemi niho mārō ake (hei tauira, te taimana, te tungsten carbide rānei) kia kore ai e tere te memeha.
• MatotoruKo ngā matotoru FCB noa ko te 4mm (ngā ārai o roto), 6-12mm (te whakakikorua o waho), me te 15-25mm (ngā panera hanganga). Ko ngā papa matotoru e hiahia ana ki ngā mata kani e ranea ana te kaha ki te hōhonu tapahi me ngā matihiko pakari hei ārai i te piko o te mata i te wā e tapahi ana.
• Whakaotinga mataKo te FCB mata-maeneene (mō ngā mahi whakapaipai) me whai mata kani me ngā niho angiangi me ngā paninga ārai-waku hei karo i ngā karawarawa o te mata, ko te FCB mata-taratara (mō te whakamahinga hanganga) ka taea te whakamahi i ngā hoahoa niho kaha ake hei whakapai ake i te whai huatanga.

3. Ngā Whakatakotoranga o te Mata Kani: Ngā Tawhā Matua mō te Tapahi Papa Sima Muka

I runga i ngā āhuatanga o te FCB me ngā paerewa OSHA (hei tauira, ngā rohenga whānui o te mata mō te whakahaere puehu), kāore e taea te whiriwhiri i ngā tawhā mata kani e whai ake nei mō te mahi tino pai me te tutuki i ngā whakaritenga.

3.1 Te Diameter o te Mata: Te Whakatutukitanga Tino ki te ≤8 Inihi

E ai ki te Ripanga 1 o te OSHA 1926.1153 me ngā tuhinga mahi pai rawa atu mō ngā taputapu,me whakamahi ngā kani hiko ringaringa mō te tapahi FCB i ngā mata he 8 inihi te whānui, iti iho rānei.Ehara tēnei whakaritenga i te mea tūpono noa:

• Hototahi ki te kohikohi puehuKo te tapahi FCB e whakawhirinaki ana ki ngā pūnaha hauhautanga ā-rohe (LEV). Ko ngā mata he nui ake i te 8 inihi ka nui ake i te kaha o te hau o te pūnaha LEV (e whakahau ana te OSHA kia ≥25 putu kūpiko ia meneti [CFM] o te hau mō ia inihi o te whānui o te mata). Hei tauira, ko te mata 10-inihi ka hiahia ki te ≥250 CFM—he nui atu i te kaha LEV o te kani ringaringa noa—ka hua ake he tukunga puehu kāore i te whakahaeretia.
• Te haumaru mahiMā ngā mata iti ake te whānui (4-8 inihi) ka whakaitihia te koretake o te hurihuri o te kani, ka māmā ake te whakahaere i te wā e whakamahia ana e te ringaringa, inā koa mō ngā tapahi poutū (hei tauira, ngā panera pakitara o waho) ngā tapahi tika rānei (hei tauira, ngā whakatuwheratanga matapihi). Mā ngā mata nui ake ka nui ake te tūponotanga o te piko o te mata, te whana whakamuri rānei, ka tū he tūponotanga haumaru.

Ngā kōwhiringa whānui noa mō te tapahi FCB: 4 inihi (ngā kani iti ā-ringa mō ngā tapahi whaiti), 6 inihi (te tapahi FCB whānui), me te 8 inihi (ngā panera FCB matotoru, tae atu ki te 25mm).

3.2 Rauemi Mata Mata: Te Whakataurite i te Pakari me te Ātete Wera

Me tu atu te matihiko (te "tinana" o te mata kani) i te ātete o te FCB me te wera e puta mai ana i te wā e tapahi ana. E rua ngā rauemi matua e whakamahia ana:

• Rino whakapakeke (HSS)He pai mō te tapahi iti te rahinga (hei tauira, ngā whakatikatika hanga i te papaanga). He pakari pai engari he iti te ātete ki te wera—ka taea e te tapahi roa te whakapiko i te matihiko, ka hua ake he tapahi kore taurite. He iti te utu o ngā matihiko HSS engari me whakawhiti pinepine ngā mata mō te whakaputa nui.
• Rino mata-karapiHe mea tino pai mō te tapahi nui (hei tauira, te hanga-mua o ngā panera FCB i te wheketere). Ka whakarei ake te paninga carbide i te ātete ki te kakahu, ko te matua maitai ia ka mau tonu te pakari. Ka taea e ia te tu atu ki te tapahi tonu i te 500+ panera FCB (6mm te matotoru) me te kore e piko, e hangai ana ki ngā hiahia whai hua o te whakaputa.

3.3 Te Hoahoa Niho: Te Ārai i te Pakaru me te Whakaiti i te Puehu

Ka pā tika te hoahoa o ngā niho ki te kounga tapahi (te maeneene o te taha) me te putanga puehu. Mō te FCB, he mea nui ngā āhuatanga niho e whai ake nei:

• Te maha o ngā niho: 24-48 niho mō ia mata. He iti te maha o ngā niho (24-32 niho) mō te FCB matotoru (15-25mm) te tapahi tere rānei—ka whakaitihia te waku me te wera e ngā niho iti engari ka pāngia pea e ngā pakaru iti. He nui te maha o ngā niho (36-48 niho) mō te FCB angiangi (4-12mm) ngā panera mata maeneene rānei—he nui ake ngā niho e tohatoha ana i te kaha tapahi kia ōrite, kia whakaitihia ai te pakaru.
• Āhua niho: Te hurihanga o runga rerekē (ATB) te hurihanga maramara-toru rānei (TCG). He pai ngā niho ATB (me ngā tihi koki) mō ngā tapahi maeneene i runga i ngā rauemi pakarukaru pēnei i te FCB, nā te mea ka tapatapahia e rātou te anga sima me te kore e kuru i ngā taha. Ka whakaratohia e ngā niho TCG (he huinga o ngā taha papatahi me ngā taha piko) he pakari ake mō te FCB whakakoi, kia pai ai mō te tapahi nui.
• Te mokowā nihoHei ārai i te aukati puehu, me whānui ake te tawhiti (≥1.5mm). Ka puta he puehu angiangi i te tapahi FCB; ka taea e te tawhiti niho whaiti te hopu puehu i waenga i ngā niho, ka nui ake te waku me te whakaiti i te tere tapahi. Mā te tawhiti whānui ka taea e te puehu te mawhiti noa, e hangai ana ki te kohinga puehu o te pūnaha LEV.

3.4 Paninga: Te Whakapai Ake i te Mahi me te Roa o te Ora

Ka whakaitihia e ngā paninga ārai-waku te hanga wera me te piri o te puehu, ka roa ake te ora o te mata, ka whakapai ake hoki i te maeneene o te tapahi. Ngā paninga noa mō ngā mata kani FCB:

• Nitride Taitānia (TiN)He paninga koura e whakaiti ana i te waku mā te 30-40% ki te whakaritea ki ngā mata kāore i pania. He pai mō te tapahi FCB whānui, ka ārai i te puehu kei piri ki te mata, ka whakaiti i te wā horoi.
• Waro rite ki te taimana (DLC)He paninga tino mārō (mārō ≥80 HRC) e ātete ana ki te pakū mai i te onepu silica. Ka roa ake te mau o ngā mata kua pania ki te DLC i ngā mata kua pania ki te TiN, ā, he iti ake te utu mō te hanga FCB nui.

4. Te Whakataurite i ngā Taputapu: Te Whakataurite i ngā Mata Kani ki ngā Mīhini Tapahi

Kāore e taea e te mata kani kounga teitei te mahi pai me te kore he taputapu tapahi hototahi. E ai ki ngā aratohu a te OSHA, ko te tapahi FCB e whakawhirinaki ana kikani hiko ringaringa me ngā pūnaha whakahaere puehu whakauru—te pūnaha hauhautanga ā-rohe (LEV) me ngā pūnaha tuku wai rānei (ahakoa he pai ake te LEV mō te FCB hei karo i te puranga paru mākū).

4.1 Taputapu Matua: Ngā Kani Mana Ringaringa me ngā Pūnaha LEV

E whakahau ana a OSHA me whai taputapu ngā kani ringaringa mō te tapahi FCBngā pūnaha kohikohi puehu e wātea ana i te hokohoko(LEV) e tutuki ana i ngā paearu matua e rua:

• Te kaha o te rere o te hau: ≥25 CFM mō ia inihi o te whānui o te mata (hei tauira, me ≥200 CFM te mata 8-inihi). Me ōrite te whānui o te mata kani ki te rere o te hau o te pūnaha LEV—he pai te whakamahi i te mata 6-inihi me te pūnaha 200 CFM (ka pai ake te kohikohi puehu mēnā ka nui te rere o te hau), engari kāore e tutuki i te paerewa te mata 9-inihi me te pūnaha kotahi.
• Te whai huatanga o te tātari: ≥99% mō te puehu manawa. Me hopu e te tātari o te pūnaha LEV te puehu silica hei ārai i te pānga o te kaimahi; me hanga ngā mata kani hei tuku i te puehu ki te hipoki o te pūnaha (hei tauira, he mata mata kōpiko e tuku ana i te puehu ki te putanga kohikohi).

Ina whakatauritehia ngā mata kani ki ngā kani ringaringa, tirohia ēnei e whai ake nei:

• Rahi o te rākauMe ōrite te kōhao waenga o te mata kani (te rakau) ki te whānui o te miro o te kani (ngā rahi noa: 5/8 inihi, 1 inihi rānei). Ka wiri te mata i te rakau kāore i te ōrite, ka hua ake he tapahi kāore i te ōrite, ka nui haere hoki te puehu.
• Hototahi tereKo te tere hurihuri haumaru mōrahi (RPM) o ngā mata kani. Ko te tere o te mahi a ngā kani ringaringa mō te FCB i te nuinga o te wā i te 3,000-6,000 RPM; me whakatau te tere o ngā mata kia rite ki te RPM mōrahi o te kani (hei tauira, he haumaru te tere o te mata kua whakatauria kia 8,000 RPM mō te kani 6,000 RPM).

4.2 Taputapu Tuarua: Ngā Pūnaha Tuku Wai (mō ngā horopaki motuhake)

Ahakoa he pai ake te LEV mō te tapahi FCB, ka taea te whakamahi i ngā pūnaha tuku wai (kua whakauruhia ki roto i ngā kani ringaringa) mō te tapahi o waho, he nui te rahinga (hei tauira, te tāutanga o ngā panera pakitara o waho). Ina whakamahia ngā pūnaha wai:

• Rauemi mata kaniKōwhiria ngā matihiko ātete-waikura (hei tauira, te kāpira kua pania ki te maitai kore waikura) hei ārai i te waikura i te pānga o te wai.
• Paninga nihoĀraia ngā paninga wairewa-wai; he ātete-wai ngā paninga TiN, DLC rānei, ā, ka mau tonu te mahi.
• Te whakahaere paruMe hanga te mata kani kia iti ake te tauhiuhi paru (hei tauira, he mata niho e pakaru ana i te puehu mākū), nā te mea ka piri pea te paru ki te mata, ka whakaiti i te pai o te tapahi.

4.3 Te Tiaki Taputapu: Te Tiaki i ngā Mata Kani me te Whakatutukitanga

Mā te tiaki i ngā taputapu i ia wā ka whakarite kia pai te mahi a te mata kani me te tutuki hoki i ngā whakaritenga a te OSHA:

• Tirotiro i te taupokiTirohia te hipoki o te pūnaha LEV (te wāhanga e karapoti ana i te mata) mō ngā pakaru, ngā hē rānei o te tūnga. Mā te hipoki pakaru ka puta te puehu, ahakoa he mata kani kounga teitei.
• Te pono o te ngongoTirohia ngā ngongo o te pūnaha LEV mō ngā piko, ngā turuturu rānei—ka whakaitihia te kohikohinga puehu e te aukati o te rere o te hau, ā, ka whakararu i te mata kani (ka piki ake te waku mai i te puehu kua mau).
• Te kukū o te mataKia tino mau te mata kani ki te miro. Ka wiri te mata wetekina, ka pakaru, ka pakaru wawe hoki.

5. Tātari Āhuatanga Whakaputa: Te Whakarite i ngā Mata Kani ki ngā Hiahia Whakaputa

Ko ngā tikanga whakaputa—tae atu ki te rahinga, ngā whakaritenga tika, me ngā paerewa tutuki—e whakatau ana i te toenga "utu-mahi" o te kōwhiringa mata kani.

5.1 Te Rahi Whakaputa: Te Rahi Iti me te Rahi Nui

• Te whakaputa iti-rahi (hei tauira, te tapahi hanga i runga i te papaanga)Whakatairangahia te whai huatanga o te utu me te ngāwari ki te kawe. Kōwhiria ngā mata HSS, ngā mata carbide rānei kua pania ki te TiN (4-6 inihi te whānui) mō ngā tapahi i ētahi wā. He utu tika ēnei mata, ā, he ngāwari ki te whakakapi, ā, he pai te whānui o ēnei mata ki ngā kani ringaringa kia ngāwari ai te nekeneke i te wāhi mahi.
• Te whakaputanga nui (hei tauira, te hanga-mua o ngā panera FCB i te wheketere)Whakatairangahia te roa me te whai huatanga. Kōwhiria ngā mata karāhe kua pania ki te DLC (6-8 inihi te whānui) me ngā hoahoa niho TCG. Ka taea e ēnei mata te tu atu ki te tapahi tonu, ka whakaiti i te wā kore mahi mō te whakawhiti mata. Hei tāpiri, tauritehia ki ngā pūnaha LEV kaha-teitei (≥200 CFM mō ngā mata 8-inihi) hei pupuri i te tutuki me te hua.

5.2 Ngā Whakaritenga Tika o te Tapahi: Hanganga me te Whakapaipai

• FCB hanganga (hei tauira, ngā panera amo kawenga)He taurite ngā whakaritenga mō te tika (±1mm te manawanui ki te tapahi). Kōwhiria he mata niho 24-32 me ngā hoahoa ATB, TCG rānei—ka tere ake te mahi mā te iti o ngā niho, ā, ka whakaitihia te pakaru o te niho mō te tāutanga hanganga.
• FCB whakapaipai (hei tauira, ngā panera pakitara o roto me ngā taha e kitea ana)He tino tika ngā whakaritenga mō te tika (±0.5mm te manawanui ki te tapahi). Kōwhiria he mata niho 36-48 me ngā hoahoa ATB me ngā paninga DLC. Mā te nui o ngā niho ka maeneene ngā taha, ā, mā te paninga ka ārai i ngā karawarawa, ka tutuki ai ngā paerewa ataahua.

5.3 Ngā Whakaritenga Whakatutuki: OSHA me ngā Ture ā-Rohe

Ko te OSHA 1926.1153 te paerewa matua mō te tapahi FCB, engari tera pea ka whakatakotohia e ngā ture ā-rohe ētahi atu whakaritenga (hei tauira, he herenga tukunga puehu pakari ake i ngā tāone nui). I te wā e whiriwhiri ana i ngā mata kani:

• Whakahaere puehuMe whakarite kia hototahi ngā mata ki ngā pūnaha LEV (hei tauira, te diameter ≤8 inihi, te whāriki pupuhi puehu) kia tutuki ai te rohenga whakaraeraetanga silica ka taea te manawa a OSHA (50 μg/m³ i roto i te nekehanga 8-hāora).
• Te tapanga haumaruKōwhiria ngā mata he mārama ngā tapanga haumaru (hei tauira, te RPM mōrahi, te whānui, te hototahitanga o ngā rauemi) kia tutuki ai ngā whakaritenga tapanga taputapu a OSHA.
• Te tiakitanga o ngā kaimahiAhakoa kāore ngā mata kani e whakarato tika i te tiaki manawa, ko tōna kaha ki te whakaiti i te puehu (mā te hoahoa tika) e tautoko ana i te whakaritenga a OSHA mō ngā manawa APF 10 i roto i ngā wāhi kua kati (ahakoa ko te tapahi FCB he mea mahi i waho, e ai ki ngā tikanga pai).

6. Ngā Horopaki Whakamahinga: Te Whakarerekē i ngā Mata Kani ki ngā Āhuatanga o te Papa

He rerekē ngā āhuatanga tapahi FCB i runga i te taiao (o waho, o roto rānei), te momo tapahi (tika, piko), me ngā āhuatanga o te rangi—he pānga katoa ēnei ki te kōwhiringa mata kani.

6.1 Te Tapahi i Waho (Te Horopaki Matua mō te FCB)

E ai ki ngā mahi pai a te OSHA, ko te tapahi i te FCB he mea nuipai ki wahohei whakaiti i te kohikohinga puehu (me whakamahi pūnaha whakaputa hau tāpiri mō te tapahi i roto i te whare). Ko ngā āhuatanga o waho ko:

• Te tāutanga o te panera pakitara o wahoMe tapahi poutū me te tika (kia uru ki ngā whakatuwheratanga matapihi/tatau). Kōwhiria ngā mata niho ATB 6-inihi (36 niho) me ngā paninga TiN—ka taea te kawe mō te whakamahi i te papaanga, ā, ka ātete te paninga ki te makuku o waho.
• Te tapahi i te papa o raro o te tuanui: Me tapahi tere, tika hoki i runga i te FCB angiangi (4-6mm). Kōwhiria ngā mata niho TCG 4-inihi (24 niho)—he iti te diameter mō te urunga ngāwari ki te tuanui, ā, ka taea e ngā niho TCG te pupuri i te FCB tuanui whakakoi (he nui ake te ihirangi silica).
• Ngā whakaaro mō te huarereI ngā āhuatanga haukū, ua rānei o waho, whakamahia ngā mata e ātete ana ki te waikura (hei tauira, ngā mata maitai kore waikura). I ngā āhuatanga hau nui, whiriwhiria ngā mata he hoahoa niho taurite hei whakaiti i te wiri (ka taea e te hau te whakanui ake i te wiri o te mata).

6.2 Te Tapahi o Roto (Ngā Kēhi Motuhake)

Ko te tapahi FCB o roto (hei tauira, te tāutanga ārai o roto i ngā whare kua kati) ka whakaaetia anake mete whakahaere puehu kua whakarei ake:

• Kōwhiringa mata kaniWhakamahia ngā mata 4-6 inihi (he iti ake te whānui = he iti ake te puehu e puta mai ana) me ngā paninga DLC (ka whakaiti i te piri o te puehu). Āta karohia ngā mata 8-inihi i roto i te whare—he nui ake te puehu e puta mai ana i a rātou, ahakoa he pūnaha LEV.
• Putanga hau āwhinaHonoa te mata kani ki ngā pā hau kawe (hei tauira, ngā pā hau axial) hei tāpiri i ngā pūnaha LEV, e anga ana te puehu ki ngā putanga hau. Me rite te anga rere puehu o te mata kani ki te ahunga rere o te hau o te pā.

6.3 Momo Tapahi: Tika, Piko rānei

• Ngā tapahi tika (te mea tino noa)Whakamahia ngā mata kani porowhita-katoa (ngā mata kani porowhita paerewa) me ngā niho ATB, TCG rānei. Mā ēnei mata ka taea te tapahi tika, pūmau mō ngā panera, ngā pou, ngā whakapaipai rānei.
• Ngā tapahi piko (hei tauira, ngā āwhata)Whakamahia ngā mata whaiti te whānui (≤0.08 inihi te matotoru) me ngā niho angiangi (48 niho). He ngāwari ake ngā mata angiangi mō ngā tapahi piko, ā, mā ngā niho angiangi ka ārai i te pakaru o te taha piko. Āta karohia ngā mata matotoru—he pakari, ā, ka whati pea i te wā e tapahi piko ana.

7. Whakamutunga: He Anga Pūnaha mō te Kōwhiringa Mata Kani

Ko te whiriwhiri i te mata kani tapahi papa sima muka tika me whai huarahi whānui e whakauru ana i ngā āhuatanga rauemi, ngā tawhā mata kani, te hototahitanga taputapu, ngā āhuatanga whakaputa, me ngā horopaki tono—me te piri tonu ki ngā paerewa haumaru a OSHA. Hei whakarāpopototanga i te anga whiriwhiri:

1. Tīmata ki te rauemiTātarihia te mātotoru, te matotoru, me te nui o te silica o te FCB hei tautuhi i ngā whakaritenga o te mata kani matua (hei tauira, te ātete ki te kakahu mō ngā papa mātotoru, te whakahaere puehu mō ngā papa silica nui).
2. Ngā tawhā mata kani matua rakaKia ≤8 inihi te whānui (kia tutuki i ngā whakaritenga OSHA), tīpakohia te matihiko/niho/paninga i runga i te rahinga whakaputa (DLC mō te rahinga nui) me te tika (he nui te maha o ngā niho mō ngā tapahi whakapaipai).
3. Taurite ki ngā taputapuManatokohia te rahi o te arbor, te hototahitanga RPM, me te rere o te hau o te pūnaha LEV (≥25 CFM/inihi) hei whakarite i te mahi tino pai me te whakahaere puehu.
4. Kia rite ki ngā tikanga whakaputaWhakaōritehia te utu me te pakari (rahinga iti: HSS; rahinga nui: DLC) me te whakatutuki i ngā whakaritenga tika/ture.
5. Whakarerekētia ki ngā horopakiWhakamahia ngā mata tapahi whaiti, ngāwari hoki mō ngā tapahi piko hei kaupapa matua mā te mahi i waho (ātete ki te waikura).

Mā te whai i tēnei anga, ka taea e ngā kaihanga, ngā kaimahi kirimana, me ngā kaihanga te whiriwhiri i ngā mata kani e kore e tuku noa i te tapahi FCB kounga teitei, engari e whakarite ana hoki kia tutuki i ngā paerewa OSHA me te tiaki i ngā kaimahi mai i te pānga o te puehu silica—ā, i te mutunga ka tutuki he taurite o te mahi, te haumaru, me te whai huatanga utu.