Labaran kamfani
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Ƙirƙirar Maganin Haɗaɗɗen Filastik na Itace: Masu Lubricants a cikin WPC
Innovative Wood Plastic Composite Solutions: Lubricants a WPC Wood roba composite (WPC) wani hadadden abu ne da aka yi da filastik a matsayin matrix da itace a matsayin filler, A cikin samar da WPC da sarrafa mafi mahimmancin wuraren zaɓin ƙari ga WPCs sune wakilai masu haɗawa, masu lubricants, kuma mai launi...Kara karantawa -
Yadda za a warware matsalolin sarrafawa na masu kare wuta?
Yadda za a warware matsalolin sarrafawa na masu kare wuta?Masu kashe wuta suna da girman kasuwa sosai a duniya kuma ana amfani da su sosai a masana'antu kamar gini, kera motoci, lantarki, sararin samaniya, da dai sauransu. A cewar rahoton bincike na kasuwa, kasuwar mai kashe wuta ta kiyaye ...Kara karantawa -
Ingantattun Magani Don Yin iyo Fiber a cikin Fiber Ƙarfafa Filastik.
Ingantattun Magani Don Yin iyo Fiber a cikin Fiber Ƙarfafa Filastik.Don haɓaka ƙarfi da juriya na zafin jiki na samfuran, yin amfani da filaye na gilashi don haɓaka gyare-gyaren robobi ya zama zaɓi mai kyau sosai, kuma abubuwan ƙarfafa fiber na gilashi sun zama m ...Kara karantawa -
Yadda za a inganta tarwatsawar wuta retardants?
Yadda za a inganta tarwatsawar masu kare wuta Tare da aikace-aikacen da yawa na kayan polymer da kayan masarufi na lantarki a cikin rayuwar yau da kullum, abubuwan da ke faruwa na wuta kuma suna karuwa, kuma cutar da ita ta fi damuwa.Aiki retardant harshen polymer kayan ya zama ...Kara karantawa -
PPA maras fluorine a aikace-aikacen sarrafa fim.
PPA maras fluorine a aikace-aikacen sarrafa fim.A cikin samar da fina-finai na PE da sarrafa shi, za a sami matsaloli masu yawa na sarrafawa, kamar tarin bakin ƙirƙira na kayan, kaurin fim ɗin ba daidai ba ne, ƙarshen farfajiya da santsin samfurin bai isa ba, ingantaccen aiki ...Kara karantawa -
Madadin mafita ga PPA a ƙarƙashin iyakokin PFAS.
Madadin mafita ga PPA a ƙarƙashin PFAS ƙuntatawa PPA (Polymer Processing Additive) wanda shine kayan aikin sarrafa fluoropolymer, tsarin tushen fluoropolymer ne na kayan aikin sarrafa polymer, don haɓaka aikin sarrafa polymer, yana kawar da fashewar narkewa, yana warware ginin mutuwa, .. .Kara karantawa -
Waya da kebul a cikin tsarin samarwa me yasa ake buƙatar ƙara man shafawa?
Waya da kebul a cikin tsarin samarwa me yasa ake buƙatar ƙara man shafawa?A cikin samar da waya da na USB, lubrication mai kyau yana da mahimmanci saboda yana da tasiri mai mahimmanci akan haɓaka saurin extrusion, inganta bayyanar da ingancin samfuran waya da na USB da aka samar, rage kayan aiki d ...Kara karantawa -
Yadda za a magance wuraren zafi na kayan aiki maras hayaƙin halogen maras haya?
Yadda za a magance wuraren zafi na kayan aiki maras hayaƙin halogen maras haya?LSZH yana tsaye ga ƙananan hayaki sifili halogens, ƙarancin halogen-kyauta, irin wannan nau'in kebul da waya yana fitar da hayaki kaɗan kuma baya fitar da halogen mai guba lokacin fallasa ga zafi.Duk da haka, don cimma wadannan biyu ...Kara karantawa -
Yadda za a warware matsalolin aiki na itace-roba composites?
Yadda za a warware matsalolin aiki na itace-roba composites?Ƙwararren filastik na itace wani abu ne mai haɗaka da aka yi daga haɗuwa da zaren itace da filastik.Yana haɗuwa da kyawawan dabi'un itace tare da yanayi da juriya na lalata filastik.Haɗin katako-roba yawanci ...Kara karantawa -
Maganin Lubricant Don Samfuran Haɗin Filastik ɗin Itace.
Maganin Lubricant Don Kayayyakin Kayan Filastik na katako A matsayin sabon kayan haɗin gwiwar muhalli, kayan aikin katako na katako (WPC), duka katako da filastik suna da fa'ida biyu, tare da kyakkyawan aiki na aiki, juriya na ruwa, juriya na lalata, tsawon rayuwar sabis, faffadan sou. ..Kara karantawa -
Yadda za a magance matsalar cewa wakilin fim na al'ada yana da sauƙin hazo ƙaura m?
Yadda za a magance matsalar cewa wakilin fim na al'ada yana da sauƙin hazo ƙaura m?A cikin 'yan shekarun nan, aiki da kai, babban sauri da ingantaccen haɓaka hanyoyin sarrafa fina-finai na filastik don haɓaka haɓakar samarwa don kawo sakamako mai mahimmanci a lokaci guda, zana ...Kara karantawa -
Magani don inganta santsi na PE fina-finai.
Magani don inganta santsi na PE fina-finai.A matsayin kayan da aka yi amfani da su sosai a cikin masana'antar marufi, fim ɗin polyethylene, slim ɗin sa yana da mahimmanci ga tsarin marufi da ƙwarewar samfur.Koyaya, saboda tsarin kwayoyin halitta da halayensa, fim ɗin PE na iya samun matsaloli tare da s ...Kara karantawa -
Kalubale da Magani don Rage COF a cikin HDPE Telecom Ducts!
Amfani da manyan bututun sadarwa na polyethylene (HDPE) yana ƙara samun karbuwa a cikin masana'antar sadarwa saboda ƙarfinsa da ƙarfinsa.Koyaya, tashoshin sadarwa na HDPE suna da saurin haɓaka wani sabon abu da aka sani da raguwar “coefficient of friction” (COF).Wannan na iya ...Kara karantawa -
Yadda za a inganta anti-scratch na polypropylene abu don mota ciki?
Yadda za a inganta anti-scratch na polypropylene abu don mota ciki?Yayin da masana'antar kera motoci ke ci gaba da bunkasa, masana'antun suna neman hanyoyin inganta ingancin motocinsu.Abu mafi mahimmanci na ingancin abin hawa shine ciki, wanda ke buƙatar zama mai dorewa, ...Kara karantawa -
Hanyoyi masu inganci don inganta juriyar abrasion na EVA soles.
Hanyoyi masu inganci don inganta juriyar abrasion na EVA soles.Soles ɗin EVA sun shahara tsakanin masu amfani saboda ƙarancin nauyi da kaddarorinsu masu daɗi.Duk da haka, ƙafar ƙafar EVA za su sami matsalolin lalacewa a cikin amfani da dogon lokaci, wanda ke shafar rayuwar sabis da ta'aziyyar takalma.A cikin wannan labarin, mun w...Kara karantawa -
Yadda za a inganta juriya na abrasion na takalman takalma.
Yadda za a inganta juriya na abrasion na takalman takalma?Inganta juriya na abrasion na takalman takalma da kuma tsawaita rayuwar sabis na takalma ya kasance babban buƙatun takalma.Domin wannan...Kara karantawa -
Yadda za a Zaɓi Ƙarƙashin Ƙarƙashin Mai Dama Don WPC?
Yadda za a Zaɓi Ƙarƙashin Ƙarƙashin Mai Dama Don WPC?Itace-plastic composite (WPC) wani abu ne da aka yi da filastik azaman matrix da foda na itace azaman filler, kamar sauran kayan haɗin gwiwar, kayan haɗin gwiwar ana adana su a cikin ainihin nau'ikan su kuma an haɗa su don samun sabon comp...Kara karantawa -
Maganganun Abubuwan Haɓakawa marasa Fluorine don Fina-finai: Hanya zuwa Marufi Mai Dorewa!
Maganganun Abubuwan Haɓakawa marasa Fluorine don Fina-finai: Hanya zuwa Marufi Mai Dorewa!A cikin kasuwannin duniya da ke ci gaba da sauri, masana'antar tattara kaya sun ga sauye-sauye masu mahimmanci a cikin 'yan shekarun nan.Daga cikin nau'ikan marufi daban-daban da ake da su, marufi masu sassauƙa sun fito a matsayin yawan jama'a ...Kara karantawa -
SILIKE-China Slip Additive Manufacturer
SILIKE-China Slip Additive Manufacturer SILIKE yana da fiye da shekaru 20 na gwaninta wajen haɓaka abubuwan da ke cikin siliki. A cikin labaran baya-bayan nan, yin amfani da magungunan zamewa da abubuwan da ke hana shinge a cikin BOPP / CPP / CPE / fina-finai na busa ya zama sananne.Ana amfani da abubuwan zamewa da yawa don rage rikici tsakanin l...Kara karantawa -
Wakilin rigakafin sawa / abrasion masterbatch don tafin takalma
Wakilin anti-wear / abrasion masterbatch na takalma tafin kafa Takalma, kayan amfani ne na ɗan adam.Bayanai sun nuna cewa, Sinawa na amfani da takalmi kusan 2.5 a kowace shekara, abin da ke nuna cewa, takalma na da wani muhimmin matsayi a fannin tattalin arziki da zamantakewa.A cikin 'yan shekarun nan, tare da inganta ...Kara karantawa -
Yadda za a warware iyo fiber a cikin gilashin fiber ƙarfafa PA6 allura gyare-gyaren?
Gilashin fiber-ƙarfafa matrix polymer matrix composites sune mahimman kayan aikin injiniya, sune abubuwan da aka fi amfani da su a duk duniya, galibi saboda tanadin nauyin su a hade tare da ƙayyadaddun ƙayyadaddun tauri da ƙarfi.Polyamide 6 (PA6) tare da 30% Gilashin Fiber (GF) shine ɗayan ...Kara karantawa -
Si-TPV Overmolding don kayan aikin wuta
Yawancin masu zanen kaya da injiniyoyin samfur za su yarda cewa overmolding yana ba da babban aikin ƙira fiye da gyare-gyaren allura na “harbi ɗaya” na gargajiya, kuma yana samar da abubuwan haɗin gwiwa.waɗanda suke duka masu dorewa da jin daɗin taɓawa.Kodayake hannayen kayan aikin wutar lantarki galibi ana yin su ne ta amfani da silicone ko TPE ...Kara karantawa -
Aesthetic da taushi touch overmolding wasanni kayan aiki mafita
Bukatu na ci gaba da karuwa a aikace-aikacen wasanni daban-daban don samfuran ergonomically ƙera.Dynamic vulcanized thermoplastic Silicone-based elastomers (Si-TPV) sun dace da aikace-aikacen kayan wasanni da kayan Gym, suna da taushi da sassauƙa, suna sa su dace don amfani da wasanni ...Kara karantawa -
Material Solutions 丨 Duniyar nan gaba ta Kayan aikin Ta'aziyyar Wasanni
SILIKE's Si-TPVs suna ba da masu kera kayan wasanni na dindindin ta'aziyya mai laushi mai laushi, juriya, aminci mai aminci, dorewa, da kyakkyawan aiki, wanda ya dace da hadaddun buƙatun masu amfani da kayan wasanni na ƙarshe, buɗe kofa don duniyar gaba mai girma. -Ingantattun Kayan Wasanni ...Kara karantawa -
Menene Silicone Powder da fa'idodin aikace-aikacen sa?
Silicone foda (wanda kuma aka sani da Siloxane foda ko foda Siloxane), wani babban aiki ne mai kyauta mai kyauta mai kyauta tare da kyawawan kaddarorin silicone irin su lubricity, shawar girgiza, yaduwar haske, juriya na zafi, da juriya na yanayi.Silicone foda yana samar da babban aiki da hawan igiyar ruwa ...Kara karantawa -
Menene kayan da ke ba da tabo da mafita mai laushi don kayan wasanni?
A yau, tare da haɓaka wayar da kan jama'a a cikin kasuwannin kayan aikin wasanni don aminci da dorewa kayan da ba su ƙunshi kowane abubuwa masu haɗari ba, suna fatan sabbin kayan wasanni suna da daɗi, da kyau, dorewa, kuma masu kyau ga ƙasa.gami da samun matsala rike tsallen mu...Kara karantawa -
Magani ga saurin samar da fim ɗin BOPP
Yaya sauri samar da fim ɗin polypropylene (BOPP) mai daidaitacce bi-axially?Babban ma'ana ya dogara da kaddarorin abubuwan abubuwan da za su zamewa, waɗanda ake amfani da su don rage ƙimar juzu'i (COF) a cikin fina-finan BOPP.Amma ba duk abubuwan zamewa suke da tasiri daidai gwargwado ba.Ta hanyar kakin zuma na gargajiya na gargajiya...Kara karantawa -
Novel m marufi fasahar da kayan
Gyaran Sama Ta Fasahar tushen Silicone Yawancin tsarin haɗin gwiwar multilayer na kayan marufi masu sassaucin ra'ayi sun dogara ne akan fim ɗin polypropylene (PP), fim ɗin polypropylene (BOPP), fim ɗin ƙarancin ƙarancin yawa (LDPE), da polyethylene low-density (LLDPE) ) fim....Kara karantawa -
Hanya don Haɓaka Juriya na Tsare-tsare na Talc-PP da Talc-TPO Compounds
Abubuwan daɗaɗɗen silicone na dogon lokaci don Talc-PP da Talc-TPO Compounds Ayyukan talc-PP da mahaɗin talc-TPO sun kasance babban fifiko, musamman a cikin aikace-aikacen ciki da na waje na kera motoci inda bayyanar ke taka muhimmiyar rawa a amincewar abokin ciniki. ya ku...Kara karantawa -
Silicone Additives don TPE Wire Compound Production Solutions
Ta yaya za a iya taimaka wa TPE Wire Compound don haɓaka kaddarorin sarrafawa da jin hannu?Yawancin layukan lasifikan kai da layukan bayanai an yi su ne daga fili na TPE, babban dabarar shine SEBS, PP, filler, farin mai, da granular tare da sauran abubuwan ƙari.Silicone ya taka muhimmiyar rawa a ciki.Sakamakon saurin biyan...Kara karantawa -
SILIKE Silicone Wax 丨 Man shafawa na Filastik da Wakilan Saki don samfuran Thermoplastic
Wannan shine abin da kuke buƙata don Masu Lubricants na Filastik da Wakilan Saki!Silike Tech koyaushe yana aiki a ƙirƙira fasaha da haɓaka haɓakar haɓakar siliki na fasaha.mun ƙaddamar da nau'ikan samfuran kakin siliki da yawa waɗanda za a iya amfani da su a matsayin mafi kyawun kayan shafawa na ciki da masu sakin wannan ...Kara karantawa -
SILIKE Si-TPV yana ba da sabon bayani na kayan abu don masana'anta mai laushi mai laushi ko zanen raga na ƙulli tare da juriya
Wane abu ne ke yin kyakkyawan zaɓi don yadudduka masu lanƙwasa ko rigar raga?TPU, TPU laminated masana'anta shine don amfani da fim ɗin TPU don haɓaka yadudduka daban-daban don samar da kayan hade, TPU laminated masana'anta saman yana da ayyuka na musamman kamar hana ruwa da danshi, juriya na radiation ...Kara karantawa -
Yadda ake kama da kyan gani amma ku kasance cikin kwanciyar hankali don kayan wasan ku
A cikin 'yan shekarun da suka gabata, kayan da ake amfani da su a wasanni da kayan motsa jiki sun samo asali daga albarkatun kasa irin su itace, igiya, gut, da roba zuwa karafa na fasaha, polymers, yumbu, da kayan haɗin gwiwar roba kamar abubuwan haɗin gwiwa da ra'ayoyin salula.Yawancin lokaci, ƙirar wasanni a ...Kara karantawa -
SILIKE ya ƙaddamar da ƙari masterbatch da kayan elastomer na tushen silicone na thermoplastic a K 2022
Muna farin cikin sanar da cewa za mu halarci bikin kasuwanci na K a ranar Oktoba 19th - 26th.Oct 2022. Wani sabon thermoplastic silicone-tushen elastomers abu don ba da tabo juriya da aesthetic surface na kaifin baki wearable kayayyakin da fata lamba kayayyakin zai kasance daga cikin kayayyakin hig ...Kara karantawa -
Ƙirƙirar Ƙarfafa Masterbatch Don Haɗin Filastik na Itace
SILIKE yana ba da hanya mai aiki sosai don haɓaka dorewa da ingancin WPCs yayin rage farashin samarwa.Wood Plastic Composite (WPC) hade ne na gari na itace, sawdust, ɓangaren itace, bamboo, da thermoplastic.Ana amfani da shi don yin benaye, dogo, shinge, katako na shimfidar ƙasa ...Kara karantawa -
Murnar cika shekaru 18!
Kai, fasahar Silike ta ƙarshe ta girma!Kamar yadda kuke gani ta hanyar kallon wadannan hotuna.Mun yi bikin cika shekara sha takwas.Idan muka waiwaya baya, muna da tunani da tunani da yawa a cikin kawunanmu, abubuwa da yawa sun canza a masana'antar a cikin shekaru goma sha takwas da suka gabata, koyaushe akwai sama da kasa...Kara karantawa -
2022 AR da VR Masana'antu Chain taron koli
A wannan taron koli na sarkar masana'antu na AR/VR daga ma'aikatar ilimi da sarkar masana'antu bigwigs suna yin jawabi mai ban sha'awa akan mataki.Daga yanayin kasuwa da yanayin ci gaba na gaba, lura da wuraren zafi na masana'antar VR / AR, ƙirar samfur & ƙira, buƙatun, ...Kara karantawa -
Dabarun ci gaba mai dorewa a samar da PA
Ta yaya za a cimma mafi kyawun kaddarorin tribological da ingantaccen aiki na abubuwan haɗin PA?tare da abubuwan da ke da alaƙa da muhalli.Ana amfani da Polyamide (PA, Nylon) don aikace-aikace iri-iri, gami da ƙarfafawa a cikin kayan roba kamar tayoyin mota, don amfani da igiya ko zaren, da ma ...Kara karantawa -
Sabuwar fasaha 丨 Haɗa ɗorewa mai ƙarfi tare da ta'aziyya mai taushi don Fitness Gear Pro Grips.
Sabuwar fasaha 丨 Haɗa ɗorewa mai ƙarfi tare da ta'aziyya mai taushi don Fitness Gear Pro Grips.SILIKE yana kawo muku allurar Si-TPV na kayan wasan motsa jiki na silicone.Ana amfani da Si-TPV a cikin ɗimbin nau'ikan kayan wasanni masu ƙima daga hanun igiya mai wayo, da rikon keke, rikon golf, kaɗawa ...Kara karantawa -
High quality aiki na lubricating Additives silicone masterbatch
SILIKE silicone masterbatches LYSI-401, LYSI-404: dace da silicon core tube / fiber tube / PLB HDPE tube, Multi-tashar microtube / tube da kuma babban diamita tube.Fa'idodin aikace-aikacen: (1) Ingantacciyar aikin sarrafawa, gami da mafi kyawun ruwa, rage ɗigon mutuwa, rage ƙarfin ƙarfi, zama ...Kara karantawa -
An haɗa Silike a cikin rukuni na uku na jerin kamfanoni na "Little Giant".
Kwanan nan, an haɗa Silike a cikin rukuni na uku na Ƙwarewa, Gyarawa, Bambance-bambance, Ƙirƙirar "Little Giant" jerin kamfanoni.Kamfanonin "kananan ƙattai" suna da nau'ikan "ƙwararru" guda uku.Na farko shi ne masana'antar "masanaR ...Kara karantawa -
Wakilin rigakafin sawa don takalma
Illar Takalmi tare da Tafarkin Roba Mai Juriya akan Iyawar Jikin Dan Adam.Tare da masu amfani da su sun zama masu aiki a rayuwarsu ta yau da kullum na kowane nau'in wasanni, abubuwan da ake bukata don jin dadi, da takalma masu tsalle-tsalle da abrasion sun zama mafi girma.Rubber yana da kudan zuma...Kara karantawa -
Shirye-shiryen Tsara-Resistant da Ƙananan VOCs Polyolefins Materials don Masana'antar Motoci.
Shirye-shiryen Tsara-Resistant da Ƙananan VOCs Polyolefins Materials don Masana'antar Motoci.>>Automotive mai girma da yawa polymers a halin yanzu da ake amfani da wadannan sassa ne PP, talc-cika PP, talc-cika TPO, ABS, PC (polycarbonate) / ABS, TPU (thermoplastic urethanes) da sauransu.Tare da masu amfani...Kara karantawa -
SI-TPV na muhalli & fata-fata yana inganta aikin sarrafa buroshin hakori na lantarki
Hanyar shiri na Soft Eco-friendly Electric Toothbrush Grip Handle >> Wutar lantarki na haƙoran haƙora, riko ɗin gabaɗaya an yi shi da robobin injiniya kamar ABS, PC / ABS, don ba da damar maɓallin da sauran sassa don tuntuɓar hannu kai tsaye da hannu mai kyau. ji, da wuya...Kara karantawa -
SILIKE Anti-squeaking masterbatch SILIPAS 2070
Yadda za a magance kururuwa a cikin aikace-aikacen ciki na mota !!Rage ƙarar amo a cikin cikin motoci yana ƙara zama mahimmanci, don magance wannan batun, Silike ya haɓaka babban siliPLAS 2070 na anti-squeaking, wanda shine polysiloxane na musamman wanda ke ba da ingantaccen dindindin na dindindin.Kara karantawa -
Innovative SILIMER 5320 lubricant masterbatch yana sa WPCs mafi kyau
Wood Plastic Composite (WPC) hade ne na gari na itace, sawdust, ɓangaren itace, bamboo, da thermoplastic.Wannan kayan da ya dace da muhalli.Yawanci, ana amfani da shi don yin benaye, dogo, shinge, shingen shimfidar wuri, katako da siding, benci na shakatawa,… Amma, sha ...Kara karantawa -
Masana'antar Filastik ta China, Nazari akan Abubuwan Tribological waɗanda Silicone Masterbatch ya gyara
Silicone Masterbatch/Linear low density polyethylene (LLDPE) composites tare da daban-daban abun ciki na silicone masterbatch 5%, 10%, 15%, 20%, da kuma 30%) an ƙirƙira su da zafi matsi sintering Hanyar da kuma su tribological aikin da aka gwada.Sakamakon ya nuna cewa silicone masterbatch c ...Kara karantawa -
Innovation polymer bayani don ingantattun abubuwan sawa
Kayayyakin DuPont TPSiV® sun haɗa nau'ikan silicone masu ɓarna a cikin matrix thermoplastic, wanda aka tabbatar da cewa ya haɗu da ƙarfi mai ƙarfi tare da ta'aziyya mai taushi a cikin kewayon sabbin kayan sawa.Ana iya amfani da TPSiV a cikin nau'ikan sabbin kayan sawa daga agogon wayayyun / GPS, na'urar kai, da kunnawa ...Kara karantawa -
SILIKE Sabon samfur Silicone Masterbatch SILIMER 5062
SILIKE SILIMER 5062 doguwar sarkar siloxane ce wacce aka gyara ta alkyl wacce ta ƙunshi ƙungiyoyin aikin polar.An fi amfani dashi a cikin PE, PP da sauran fina-finai na polyolefin, na iya inganta haɓakar hana hanawa & santsi na fim ɗin, da lubrication yayin aiki, na iya rage girman fil ...Kara karantawa -
Tsarin taron bazara | Ranar ginin ƙungiyar siliki a Dutsen Yuhuang
Iskar bazara ta Afrilu tana da laushi, ruwan sama yana gudana da ƙamshi Sama shuɗi ne kuma bishiyun suna kore Idan za mu iya yin balaguro na rana, kawai tunani game da shi zai kasance da daɗi. ta tsuntsaye 'twitter da kamshin furanni Silik...Kara karantawa -
R & D ginin ƙungiyar: Mun taru a nan a farkon rayuwarmu
A ƙarshen watan Agusta, ƙungiyar R&D ta Fasahar Silike ta ci gaba a hankali, sun rabu da aikin da suke yi, kuma suka tafi Qionglai don faretin farin ciki na kwana biyu da dare ~ Kunshe duk abubuwan da suka gaji!Ina so in san abin da ke sha'awar ...Kara karantawa -
Silike rahoto na musamman kan zuwa Zhengzhou robobi Expo
Silike rahoto na musamman kan zuwa baje kolin robobi na Zhengzhou daga ranar 8 ga watan Yuli zuwa 10 ga Yuli, 2020, fasahar Silike za ta halarci bikin baje kolin filastik na kasar Sin (Zhengzhou) karo na 10 a shekarar 2020 a Zhengzhou International ...Kara karantawa
