Inqubo Yokulawula Ikhwalithi Yokukhiqiza I-Silicone Butt Pad Nezindlela: Isiqinisekiso Esiphelele Kusukela Kuzinto Ezingavuthiwe Kuya Kumkhiqizo Oqediwe

Phakathi kokukhula okusheshayo kwemboni yobuhle nokunakekelwa komzimba,amaphedi e-silicone butt, ngokulingana kwazo okuphezulu, umuzwa ongokoqobo, kanye nokuma kwazo okuphumelelayo, sekuyinto ethandwayo kubathengi abaningi abafuna ukufeza umzimba wabo ofanele.

1. Ukulawulwa Kwekhwalithi Yezinto Ezingavuthiwe: Ukususa Izingozi Ezifihliwe Emthonjeni

Izinto zokusetshenziswa eziyinhloko zama-silicone butt pads yi-silicone ewuketshezi yezinga lezokwelapha. Ubumsulwa bayo, ukuphepha kwayo, kanye nezakhiwo zayo ezibonakalayo kunquma ngqo umuzwa womkhiqizo, ukuqina kwawo, kanye nokuphepha kwawo. Ngakho-ke, ukulawula izinto zokusetshenziswa kuyindlela yokuqala nebaluleke kakhulu yokuzivikela yokulawula ikhwalithi.

1. Ukuhlolwa Nokubuyekezwa Kwabahlinzeki Bezinto Ezingavuthiwe
Silandela isimiso sokukhetha okungcono kakhulu kubahlinzeki abangcono kakhulu. Bonke abahlinzeki bezinto zokusetshenziswa ze-silicone kumele bahlangabezane nezidingo ezilandelayo:

Yiba nesitifiketi esivela ezinhlanganweni eziqashelwa emhlabeni wonke njenge-FDA (US Food and Drug Administration), i-CE (European Conformity Certification), noma i-SGS (SGS International), ukuqinisekisa ukuthi izinto zabo zokusetshenziswa ziyahlangabezana nezindinganiso zokuphepha zezinga lezokwelapha;

Nikeza imibiko ephelele yokuhlola izinto zokusetshenziswa, kufaka phakathi izinkomba ezibalulekile njengokuqukethwe kwensimbi esindayo (njenge-lead, i-mercury, ne-cadmium), okuqukethwe kwe-volatile organic compound (VOC), kanye nokuhlolwa kokuhambisana kwezinto eziphilayo. Zonke izinkomba kumele zibe ngaphansi kwemingcele yokuphepha yamazwe ngamazwe;

Yiba nomthamo wokukhiqiza ozinzile kanye nezinhlelo zochungechunge lokuhlinzeka ukuqinisekisa ukuhambisana kwenqwaba yezinto zokusetshenziswa, ukuvimbela ukungazinzi kwekhwalithi yomkhiqizo okubangelwa ukushintshashintsha kwezinto zokusetshenziswa.

Ngaphezu kwalokho, senza ukuhlolwa kwekota kwabahlinzeki bethu endaweni ukuze sibukeze indawo yabo yokukhiqiza, izinqubo zokulawula ikhwalithi, kanye nezimo zokugcina izinto zokusetshenziswa ukuqinisekisa ukuthi zihlangabezana njalo nezindinganiso zethu.

2. Ukuhlolwa Okungenayo Kwezinto Ezingavuthiwe: “Ukubekezelela Okungaphelele” Kwabo Bonke Abantu

Ngisho nabahlinzeki besikhathi eside, yonke inqwaba yezinto zokusetshenziswa ze-silicone kumele ihlolwe ngokucophelela. Izinto zokuhlola zifaka:

Ukuhlolwa Kokubukeka: Bheka izinto zokusetshenziswa ze-silicone ukuze ubone ukungalingani kombala, ukungcola, amabhamuza, nezinye izinkinga ukuqinisekisa ukuthi ukubukeka kwezinto zokusetshenziswa kuhlangabezana nezindinganiso.

Ukuhlolwa Kwempahla Ebonakalayo: Sebenzisa imishini ekhethekile ukuhlola ubulukhuni be-silicone (ngokuvamile obulawulwa ku-20-30 Shore 00, ukuqinisekisa umuzwa othambile nowokunwebeka), amandla okuthamba (≥3.0 MPa), kanye namandla okudabuka (≥10 kN/m) ukuqinisekisa ukuqina okwanele nokuvimbela ukuphuka ngesikhathi sokusetshenziswa.

Ukuhlolwa Kokuphepha Kwamakhemikhali: I-Gas chromatography-mass spectrometry (GC-MS) isetshenziselwa ukuhlola okuqukethwe kwe-volatible organic compound ezintweni zokusetshenziswa ukuqinisekisa ukuthi okuqukethwe kwe-VOC kungu-≤100 mg/kg. Izitholi zensimbi esindayo nazo zisetshenziselwa ukuhlola izinsimbi ezisindayo ezifana ne-lead, i-mercury, ne-cadmium ukuqinisekisa ukuhambisana nemithethonqubo ye-EU REACH kanye namazinga e-US CPSIA.

Ukuhlolwa Kokumelana Nokushisa Nokubanda: Beka izinto zokusetshenziswa ze-silicone endaweni yokushisa ephezulu kakhulu kusukela ku-30°C kuya ku-80°C amahora angu-48 bese ubheka ukuthi aziqhekeki, aziguquki, aziqini, futhi azinazo izinkinga ukuqinisekisa ukusebenza kahle ezimweni ezahlukene.

Izinto zokusetshenziswa ezidlula zonke izinto zokuhlolwa kuphela ezingangena enkambisweni yokukhiqiza. Uma noma yisiphi isibonakaliso sehluleka, lonke iqembu lizobuyiselwa futhi ukubambisana nomhlinzeki kuzomiswa kuze kube yilapho inkinga isixazululiwe.

II. Ukulawulwa Kwekhwalithi Yenqubo Yokukhiqiza: Ukuphathwa Ngokucophelela Kwesinyathelo Ngasinye

Inqubo yokukhiqiza ama-silicone hip pads ihlanganisa ikakhulukazi ukulungiswa kwesikhunta, ukufakwa kwe-silicone, ukubumba kwe-vulcanization, ukusika, kanye nokuhlanganisa (uma kufaka phakathi isembozo). Isinyathelo ngasinye sidinga ukulawulwa ngokucophelela ukuvimbela izinkinga zekhwalithi yomkhiqizo ezibangelwa ukusebenza okungafanele.

1. Ukulungiswa Kwesikhunta: Isihluthulelo Sokunquma “Iphethini Yesikhunta” Yomkhiqizo
Ukunemba kwesikhunta kuthinta ngqo ukuma, ukulingana, kanye nokulingana kwephedi yesinqe se-silicone. Ngakho-ke, ukulawulwa kwekhwalithi ngesikhathi sokulungiselela isikhunta kubaluleke kakhulu:

Ukubuyekezwa Komklamo Wesikhunta: Ngemva kokuthi umklamo wesikhunta usuqediwe, onjiniyela bazosebenzisa isofthiwe yokumodela ye-3D ukuhlola ukunemba kobukhulu besikhunta (isb., ukubekezelela ubukhulu bephedi yesinqe kumele kube ngu-≤0.5mm), ukugoba okubushelelezi, kanye nokulingana ukuqinisekisa ukuthi isikhunta sihlangabezana nezidingo zomdwebo womklamo womkhiqizo.

Ukukhethwa Kwezinto Zokubumba: I-aluminium alloy esezingeni eliphezulu isetshenziselwa ukwakhiwa kwesikhunta. Ukushisa kwayo okuhle kakhulu kanye nokumelana nokuguguleka kuqinisekisa izinga lokushisa elifanayo ngesikhathi sokubumba kwe-vulcanization, kwandise impilo yesikhunta, futhi kunciphisa ukuguquka komkhiqizo okubangelwa ukuguguleka kwesikhunta.

Ukwelashwa Komphezulu Wesikhunta: Umphezulu wangaphakathi wesikhunta kumele upholishwe ube lukhuni oluyi-Ra ≤0.8μm ukuze kugwenywe ukuba lukhuni nokuqhekeka komphezulu ngemva kokubumba i-silicone. I-ejenti yokukhulula ukudla kufanele futhi ifuthwe phezu komphezulu wesikhunta ukuqinisekisa ukuthi i-silicone isuswa kahle ngemva kokubumba, ngaphandle kokusala komphezulu womkhiqizo.

Ukuhlolwa Kokukhiqizwa Kwesithuthuthu Sesikhunta: Ngemva kokukhiqizwa kwesithuthuthu esisha, kudingeka ukukhiqizwa kwesithuthuthu (izinsuku eziyi-10-20). (Ngemikhiqizo enosayizi othile, ukuma, kanye nokulingana, isithuthuthu siyaqinisekiswa ukuze sihlangabezane nezidingo. Uma kutholakala izinkinga, isithuthuthu siyalungiswa ngokushesha kuze kube yilapho umkhiqizo wesithuthuthu udlula ukuhlolwa.)

2. Umjovo we-Silicone: Ukulawula Okunembile Ukugwema Amabhamuza Nokushoda

Ukufakwa kwe-silicone inqubo yokufaka i-silicone ewuketshezi esikhumbeni. Le nqubo ivame ukuba nezinkinga ezifana nama-bubbles, ukuntuleka, kanye nobukhulu obungalingani, ngakho-ke idinga ukulawulwa okuqinile:

Ukulawulwa Kwesilinganiso Se-Silicone: I-silicone yoketshezi ivame ukuxutshwa ne-component A (i-base rubber) kanye ne-component B (i-curing agent) ngesilinganiso esithile (ngokuvamile i-10:1). Sisebenzisa imishini yokuxuba ezenzakalelayo ngokuphelele ukuqinisekisa iphutha lokunemba kwesilinganiso esingu-≤1%, ukuvimbela ukuxubana okungafanele okungaholela ekuqineni okungaphelele kwe-silicone noma ubulukhuni obunganelisi ngemva kokuqina.

Ukususa igesi nge-vacuum: I-silicone exubile ifakwa emshinini wokususa igesi nge-vacuum bese ikhishwa igesi imizuzu eyi-15-20 ngaphansi kwe-vacuum engu--0.095 MPa. Inqubo ihlala imizuzu eyi-10 ukususa ngokuphelele amabhamuza omoya ku-silicone, ukuvimbela amabhamuza angaphakathi noma ukwehla kobuso ngemva kokubumba.

Ukulawulwa Kokujova Okulinganiselwe: Umshini wokujova ozenzakalelayo ngokuphelele usetshenziselwa ukujova kwe-silicone. Umthamo wokujova ulawulwa ngokunembile (ngephutha elingu-≤ 2g) ngokusekelwe kubukhulu besikhunta. Lokhu kuvimbela ukujova ngokweqile okungabangela ukugcwala ngokweqile, noma ukujova okunganele okungabangela ukuntuleka komkhiqizo noma ukujiya okunganele.

Ukulawulwa Kwendawo Yokufaka Injection: Indawo yokusebenzela yokufaka injection kumele igcine izinga lokushisa elilinganayo kanye nomswakama (22±2°C, 50±5%), futhi ilandele amazinga angenalo uthuli (Izinga lokuhlanzeka le-Class 10,000) ukuvimbela uthuli oluphuma emoyeni kanye nokungcola ukuthi kungangeni ku-silicone futhi kuthinte ikhwalithi yomkhiqizo.

3. Ukuguquguquka: "Ibhalansi Eqondile" Yezinga Lokushisa Nesikhathi
I-Vulcanization ihilela ukufaka isikhunta esigcwele i-silicone ku-vulcanizer bese ulungisa i-silicone ngokushisa. Ukulawula izinga lokushisa nesikhathi phakathi nale nqubo kuthinta ngqo umphumela wokulungisa:

Ukusetha Ipharamitha Ye-Vulcanization: Izinga lokushisa le-vulcanization (ngokuvamile liyi-120-130°C) kanye nesikhathi sokupholisa (imizuzu engama-20-25) kusethwa ngokusekelwe ezicini zezinto zokusetshenziswa ze-silicone. Uhlelo lokulawula izinga lokushisa lwe-vulcanizer luqapha izinga lokushisa ngesikhathi sangempela ukuqinisekisa ukuguquguquka kwezinga lokushisa okungu-≤±2°C.

Ukuhlolwa Kwenqubo Yokuvunguza: Isikhunta esiku-vulcanizer sihlolwa njalo ngemizuzu eyi-10 ukuze kuhlolwe izinkinga ezifana nokushintsha kwesikhunta kanye nokuvuza kwe-glue. Ngemva kokuthi ukuvunguza sekuqediwe, umkhiqizo owodwa noma emibili ithathwa ngokungahleliwe ukuze ihlolwe ubulukhuni ukuqinisekisa ukuthi ihlangabezana nezindinganiso zobulukhuni ezidingekayo.

Ukulawula Ukupholisa: Ngemva kokwenziwa i-vulcanization, umkhiqizo uyasuswa esikhumbeni bese ubekwa endaweni yokupholisa ukuze uphole ngokwemvelo kuze kufike ekushiseni kwegumbi (cishe imizuzu engama-30). Lokhu kuvimbela ukucindezeleka kwangaphakathi okuvela ekupholiseni ngokweqile, okungathinta ukuguquguquka nokuqina kwawo.

4. Ukusika Nokuhlanganisa: Imininingwane Inquma Ikhwalithi

Ngemva kokupholisa, umkhiqizo udinga ukunqunywa (ukususwa kweglue eningi emaphethelweni) kanye nokuhlanganiswa (uma umkhiqizo uhlanganisa ijazi langaphandle likakotini noma elenziwe ngentambo). Ukulawulwa kwekhwalithi kule nqubo kugxile "emininingwaneni":

Izindinganiso Zokusika: Ukusika ngesandla kwenziwa kusetshenziswa ummese wokusika okhethekile. Imiphetho eqoshiwe kumele ibe bushelelezi, ingabi nama-burr, futhi ingabi neglue eningi, futhi ukugoba kwemiphetho kumele kuhambisane nomklamo womkhiqizo. Ngemva kokusika, sula indawo ngendwangu engenalo uthuli ukuqinisekisa ukuthi ihlanzekile.

Ukulawulwa Kokuhlanganiswa: Uma umkhiqizo uhlanganisa ijakethi yangaphandle, qiniseka ukuthi indwangu yejakethi yangaphandle ihlangabezana nezindinganiso zokuphepha (isb., amajakethi angaphandle ekotini kumele adlule ekuqineni kombala kanye nokuhlolwa kokuqukethwe kwe-formaldehyde), nokuthi ijakethi yangaphandle kanye nephedi yesinqe se-silicone kufaneleka kahle, ngaphandle kokuxega noma ukugudluka. Ngemva kokuhlanganiswa, hlola imithungo yejakethi yangaphandle ukuze ubone ukuthi iqine kangakanani, iyaphuka, noma iyagxuma.

Ukuhlolwa Komkhiqizo Oqediwe Kancane: Kuwo wonke amayunithi angu-50 akhiqizwayo, amayunithi angu-3 azothathwa amasampula ngokungahleliwe ukuze ahlolwe. Imikhiqizo eqediwe kancane ihlolwa ngokuphelele (kufaka phakathi ubukhulu, ubulukhuni, ukubukeka, kanye nokulingana). Uma kutholakala izinkinga, ukukhiqizwa kumele kumiswe ngokushesha. Imbangela kumele ikhonjwe futhi ixazululwe ngaphambi kokuba kuqhubeke.

III. Ukuhlolwa Kwekhwalithi Yomkhiqizo Okuqediwe: Ukuqinisekiswa Okuphelele Ukuqinisekisa "Akunazo Iziphambeko"

Ngemva kokuqeda inqubo yokukhiqiza, yonke imikhiqizo eqediwe idlula ezivivinyweni eziningi ezinzima. Imikhiqizo ephumelela kuzo zonke izivivinyo kuphela ekhishwa ukuze ithengiswe. Ukuhlolwa komkhiqizo oqediwe kuhlukaniswe izigaba ezimbili: "ukuhlolwa okuvamile" kanye "nokuhlolwa kokuthatha amasampula" ukuqinisekisa ukuzinza nokuthembeka kwekhwalithi yomkhiqizo.

1. Ukuhlolwa Okuvamile: Yonke Imikhiqizo “Iyadlula”

Umkhiqizo ngamunye oqediwe uhlolwa njalo ukuqinisekisa ukuthi ukubukeka kwawo kanye nokusebenza kwawo okuyisisekelo kuyahlangabezana nezimfuneko:

Ukuhlolwa Kokubukeka: Hlola ubuso bomkhiqizo ukuze ubone imihuzuko, ukungcola, amabhamuza, ukuhlukahluka kwemibala, nezinye izinkinga; hlola imiphetho eyisicaba, ukuma okulinganayo, bese uqinisekisa ukuthi isembozo sangaphandle (uma sikhona) sihlanzekile futhi asilimele.

Ukuhlolwa Kobukhulu: Sebenzisa amathuluzi anjenge-vernier calipers kanye ne-tape measures ukukala ubukhulu obubalulekile njengobude, ububanzi, kanye nobukhulu ukuqinisekisa ukuthi ukubekezelelana kobukhulu kuhlangabezana nezidingo zomklamo (ngokuvamile ±1mm).

Ukuhlolwa Kwesisindo: Sebenzisa isikali sedijithali ukukala isisindo somkhiqizo, uqinisekise ukubekezelelana okungu-≤±5g ukuze ugweme isisindo esingalingani esingadala ukungalingani kwabagqokile.

Ukuhlolwa Kokuthinta: Abahloli bekhwalithi yobungcweti bathinta ubuso bomkhiqizo ukuqinisekisa ukuthi uthambile futhi uyanwebeka ngendlela efanayo, okuqinisekisa umuzwa ongokoqobo nokhululekile.

Ukuhlolwa Kokuvala (kwemikhiqizo engangeni manzi): Faka umkhiqizo emanzini ukuze ubone ukuthi amanzi ayaphuma yini ukuze uqinisekise ukuthi uhlangabezana nezindinganiso ezingangeni manzi.

2. Ukuhlolwa Kokuthatha Amasampula: Ukuqinisekisa Ukuvumelana Kwekhwalithi Yeqembu

Ngaphezu kokuhlola okuvamile, senza nokuhlolwa kwamasampula kuqoqo ngalinye lemikhiqizo eqediwe (isilinganiso samasampula singu-5%, kanti ubuncane besampula bungamayunithi angu-20). Izinto zokuhlola zifaka:

Ukuhlolwa Kokuqina: Imikhiqizo inwetshwa futhi icindezelwe ngokuphindaphindiwe (kulingisa ukucindezeleka kokugqoka kwansuku zonke) izikhathi eziyi-1,000. Ngemva kokuhlolwa, imikhiqizo ihlolwa ukuthi ayinamifantu, ayiguquki, noma ayishintshi ubulukhuni. Imikhiqizo ihlanzwa futhi kahlanu emshinini wokuwasha (kusetshenziswa umjikelezo wokuwasha ojwayelekile) ukuze kuhlolwe ukuthi ayinawo umbala, ayiguquki, noma ayiwona umonakalo esembozweni sangaphandle.

Ukuhlolwa Kokuphepha: Imikhiqizo emihlanu ikhethwa ngokungahleliwe bese ithunyelwa ejensi yokuhlola ethembekile evela eceleni (njenge-SGS noma i-Intertek) ukuze kuhlolwe ukuphepha okuphelele, okuhlanganisa okuqukethwe yinsimbi esindayo, okuqukethwe kwe-organic compound okuguquguqukayo, kanye nokuhlolwa kokucasuka kwesikhumba (kusetshenziswa ukuhlolwa kwesikhumba somuntu ukuqinisekisa ukuthi umkhiqizo awucasuki) ukuqinisekisa ukuhambisana nezindinganiso zokuphepha zomhlaba wonke.

Ukuhlolwa Kokuhlangenwe Nakho Komsebenzisi: Mema abantu abayi-10-15 abazinikele abanemizimba eyahlukahlukene bagqoka umkhiqizo ukuze bahlole ukulingana kwawo, induduzo, kanye nomphumela wokubumba. Impendulo yokuzithandela iyaqoqwa, futhi noma yiziphi izinkinga zokuhlangenwe nakho komsebenzisi ezitholakele zilungiswa ngokushesha futhi zithuthukiswe.

3. Ukuphathwa Kwemikhiqizo Enezinkinga: Isimiso “Sokubekezelela Okungaphelele”
Ngemikhiqizo enephutha etholakale ngesikhathi sokuhlolwa, sisebenzisa isimiso "sokungabekezeleli lutho":

Uma inani lemikhiqizo enephutha lingu-≤1%, imikhiqizo enephutha izogcinwa yodwa, imakwe, bese ibhujiswa. Iqoqo lizobe selihlolwa okwesibili, okuphelele ukuqinisekisa ukuthi imikhiqizo esele ihlangabezana nezindinganiso zekhwalithi.

Uma inani lemikhiqizo enephutha lidlula u-1%, lonke iqembu lizomiswa ekuthunyelweni. Umnyango wekhwalithi uzophenya imbangela yokwehluleka (isb., izinkinga zezinto zokusetshenziswa, izinkinga zenqubo yokukhiqiza, amaphutha okuhlola, njll.), uthuthukise futhi usebenzise uhlelo lokulungisa, bese uphinda uhlole lonke iqembu kuze kube yilapho lihlangabezana nezindinganiso zekhwalithi.

Inqubo yokuphatha yonke imikhiqizo enephutha kumele iqoshwe ku-Quality Control Log, okuhlanganisa imbangela yokwehluleka, izinyathelo zokulungisa, kanye nemiphumela yokuhlola kabusha, ukuze kube lula ukulandelelwa nokuhlaziywa okulandelayo ukuze kuvinjelwe izinkinga ezifanayo ukuthi zingaphinde zenzeke.

IV. Uhlelo Lokulandelela Ikhwalithi: Lulandeleka Ngokugcwele, Luyaphendula

Ukuqinisekisa ukuthi ikhwalithi yomkhiqizo ngamunye ingalandelelwa emuva enkambisweni ethile nakubantu abanomthwalo wemfanelo, sisungule uhlelo oluphelele lokulandelela ikhwalithi:

Ukuphathwa Kokubhalwa Kwekhodi Yomkhiqizo: Umkhiqizo ngamunye unekhodi ehlukile (kufaka phakathi inombolo yebhetshi, usuku lokukhiqiza, indawo yokusebenzela yokukhiqiza, inombolo yomhloli wekhwalithi, njll.). Le khodi ingaqoshwa nge-laser noma ilebula kumkhiqizo noma ekupakishweni.

Ukugcinwa Kwamarekhodi Okugcwele: Kusukela ekuhlolweni kwezinto zokusetshenziswa ezingenayo, ukulawulwa kwenqubo yokukhiqiza, kuya ekuhlolweni komkhiqizo okuqediwe, isinyathelo ngasinye senqubo, okuhlanganisa idatha yokuhlola, amarekhodi okusebenza, kanye nolwazi lomuntu ophethe, kumele kufakwe ohlelweni lwe-ERP lwenkampani ukuqinisekisa ukulandelelwa okugcwele.

Isevisi Yokulandelela Abathengi: Abathengi bangafaka ikhodi yomkhiqizo ngengosi ethi “Ukulandelela Ikhwalithi” kuwebhusayithi ezimele yokuhweba kwamanye amazwe ukuze bafinyelele ulwazi olufana neqoqo lezinto zokusetshenziswa, inqubo yokukhiqiza, kanye nemiphumela yokuhlola, okuthuthukisa ukuzethemba kwabathengi ngekhwalithi yomkhiqizo.

Indlela Yokukhumbula Umkhiqizo Onephutha: Uma iqoqo lemikhiqizo litholakala linezinkinga zekhwalithi (njengezingozi zokuphepha kwezinto zokusetshenziswa noma amaphutha enqubweni yokukhiqiza), uhlelo lokulandelela ikhwalithi lungayibona ngokushesha imikhiqizo ethintekile, luqale ukubuyisa, futhi lunikeze uxolo kanye nesinxephezelo kubathengi, lunciphise umthelela edumeleni lomkhiqizo.

Isiphetho: Wina imakethe ngekhwalithi, gcina idumela ngobuciko

Kulolu ncintiswano lwanamuhla olukhula ngokusheshai-silicone hip padImakethe, ikhwalithi akuyona nje kuphela indlela yokuphila yomkhiqizo kodwa futhi iyibhuloho elakha ukwethembana phakathi kwezinkampani nabathengi. Kuphela ngokulawula okuqinile kwezinto zokusetshenziswa, ukuphathwa kwenqubo yokukhiqiza ngokucophelela, ukuhlolwa okuphelele komkhiqizo oqediwe, kanye nohlelo oluphelele lokulandelela ikhwalithi lapho singakhiqiza khona imikhiqizo esezingeni eliphezulu ehlangabezana nezindinganiso zomhlaba wonke futhi yanelise izidingo zabathengi.