Layukan sutura suna rayuwa ko mutu akan lamba ɗaya: ƙarfin kwasfa tsakanin narkakkar polymer da substrate. An yanke shawarar mannewa mai cirewa a cikin taga na ƴan daƙiƙa guda tsakanin tashar magani da nip, kuma babu adadin daidaitawa na ƙasa da zai iya ceton gidan yanar gizon da ya shiga cikin mutuwa tare da ƙarancin ƙarfin saman. Wannan jagorar ya ƙunshi saitunan jiyya, halayen juzu'i da sauye-sauyen layi waɗanda ke dogaro da isar da ƙarfi mai ƙarfi, mai maimaitawa akan murfin extrusion, lamination extrusion da layin tandem.
Me yasa mannewa mai rufin rufin asiri matsala ce ta makamashin saman
Molten polyethylene yana barin mutu a kusan digiri 300 kuma ya kai nip a cikin dakika ko biyu. A cikin wannan taga dole ne ya jika substrate gaba ɗaya kuma ya samar da haɗin gwiwa na biyu a duk fa'idodin mu'amala. Wetting yana faruwa ne kawai lokacin da makamashin da ke ƙasa ya zarce yanayin tashin hankali na narke, wanda ga LDPE yana da kusan dynes 31 a cikin santimita kuma ga copolymers kamar EAA na iya zama ƙasa.
Fim ɗin polyolefin mara magani yana zaune a dynes 29 zuwa 31, daidai a kan iyaka. Abin da ya sa extrusion shafi mannewa kasa a kan untreated stock kuma dalilin da ya sa corona jiyya daidai ne a kan kowane extrusion shafi line. Jiyya yana ɗaga saman zuwa 38 zuwa 42 dynes kuma, mafi mahimmanci, yana gabatar da ƙungiyoyin aikin polar waɗanda ke samar da haɗin gwiwar sinadarai na gaske tare da narke, ba kawai tuntuɓar van der Waals ba.
Ma'anar ma'anar ita ce ba za ku iya yin hukunci a shirye ta matakin dyne kadai ba. Fuskar da ke karanta dynes 40 saboda gurɓatawa -ƙaracin ƙazanta yana nuna bambanci da wanda ke karanta dynes 40 saboda ainihin oxidation. Abubuwan da suka shafi sabo: shekarun saman da aka kula da su, da mannewar murfin extrusion yana raguwa sosai lokacin da tazarar da ke tsakanin jiyya da nono ya wuce ƴan daƙiƙa kaɗan, musamman a ranakun zafi, zafi.
Saita Ƙarfin Corona don Ƙarfafa Rufi
Yawan Watt shine madaidaicin mai sarrafawa, wanda aka bayyana shi azaman watts kowane santimita murabba'in minti ɗaya na saman da aka yi magani. Don extrusion shafi na polyolefin akan fim ko tsare, rukunin farawa na 6 zuwa 12 W/cm²/min yana rufe yawancin layin samarwa.
Yi lissafta shi kai tsaye: yawan watt ɗin ya yi daidai da jimlar ƙarfin aiki da aka raba ta samfurin faɗin gidan yanar gizo da saurin layi. Layi mai faɗin mita 1.6 yana gudana a 200 m/min yana amfani da 20 kW yana samar da kusan 6.3 W/cm²/min. Sau biyu sauri a tsayin tsayi kuma dole ne ku ninka iko don riƙe matakin jiyya iri ɗaya.
Tarkuna biyu suna kama masu aiki akai-akai. Na farko, haɓaka ƙarfi fiye da maƙasudin raguwar dawowa yana ƙone saman, yana haifar da ƙarancin nauyi{1}}wayoyin halitta{2}} kuma a zahiri yana raunana mannewar murfin extrusion ta barin iyakar iyaka. Na biyu, yin ƙarancin ƙarfi don adana makamashi yana haifar da saman da zai gwada da kyau nan da nan amma ya kasa bayan tsufa.
Tuna ta hanyar auna ƙarfin bawo, ba ta hanyar bin lambar dyne ba. Ƙara iko a cikin matakai 10 cikin ɗari har sai an kwasfa ƙarfin faranti, sannan koma baya zuwa mafi ƙanƙancin saiti wanda har yanzu yana ba da tazara mai daɗi. Wato saiti na samarwa.
Matching Jiyya zuwa Substrate
Kowane substrate yana nuna halaye daban-daban, kuma saitunan da ke aiki akan ɗayan zasu gaza akan wani.
LDPE da LLDPE fim.Halin al'ada. Yana buƙatar cikakken magani zuwa 38 zuwa 42 dynes. Duba don maganin baya akan fina-finai da ke ƙasa da microns 25, wanda ke haifar da toshewa akan unwind.
BOPP.Mafi girman crystallinity yana nufin magani yana zaune kusa da saman kuma yana da shekaru a hankali. Manufa na 38 zuwa 40 dynes yawanci isa, amma extrusion shafi adhesion yana da hankali ga zamewar addittu waɗanda ke ƙaura zuwa saman kuma suna tsoma baki tare da haɗin gwiwa.
PET.Yana farawa a kusa da dynes 41 ba a kula da shi ba kuma yana buƙatar wucewar haske kawai don isa 45 zuwa 48. Sama da{3}}magani babban haɗari ne a nan saboda saman na iya zama foda.
Aluminum foil.Gudanarwa, don haka fitarwar ta bambanta kuma dole ne murfin nadi ya ɗauki nauyin zafi mai girma. Yadudduka na oxide akan foil suna dacewa da sinadarai tare da ƙungiyoyin iyakacin duniya, wanda shine dalilin da ya sa mannewar murfin extrusion zuwa foil galibi yana da kyau da zarar magani ya yi daidai.
Takarda da allo.Porous da danshi m. Nuna dynes 40 zuwa 44, kiyaye yawan watt matsakaici, da sarrafa danshi, tunda tururin ruwa a cikin tazarar yana hana fitar.
Rufaffen da ƙarfe na ƙarfe.Waɗannan suna buƙatar mafi ƙanƙanta, ingantaccen magani{0}sakamakon kulawa saboda layin aikin yana sirara. Rage zagayowar aiki ko na'ura mai sarrafawa - na'ura mai sarrafa plasma sau da yawa ita ce mafi kyawun amsa fiye da fasinja mai nauyi na corona.
Matsalolin Layi waɗanda ke Canza Manne Rufin Extrusion
Jiyya shigar daya ce kawai. Yawancin masu canjin layi suna canza sakamakon kuma dole ne a sarrafa su tare.
Lokaci tsakanin jiyya da nono.Wannan shine mafi ƙarancin ƙima. Ci gaba da hanya gajere gwargwadon iko. Kowane ƙarin daƙiƙa na fallasa yana kashe ƙungiyoyin polar yayin da suke sake komawa cikin mafi girma.
Yanayin yanar gizo.Ingancin jiyya yana inganta akan gidan yanar gizo mai dumi, kuma mannewa yana fa'ida daga ma'aunin zafi mai zafi a nono. Akasin haka, zafin zafin jiki da ya wuce kima yana korar ƙungiyoyin da aka kirkira.
Ozone da kuma hakar.Ozone magani ne ta -samfuri, ba magani da kansa ba, amma kuma yana lalata. Isasshen hakar yana ba da kariya ga kayan aiki kuma yana kiyaye yanayin tazara daidai, wanda ke tabbatar da mannewa da fenti don gudu.
Nip matsa lamba da zama.Matsakaicin matsi yana korar narkewa zuwa ƙananan ƙananan ({0}}porosity) kuma yana inganta maɓallin kewayawa. Wannan yana haɓaka haɗin sinadarai daga jiyya maimakon maye gurbinsa.
Mutuwa da tazarar iska.Oxidation na narkewa a cikin ratar iska yana haifar da ƙungiyoyin polar a gefen polymer. Tsawon tazarar iska yana ƙara narkewar iskar oxygen kuma zai iya rama wani ɗan ƙaramin jiyya mai rauni - amma kuma yana haɗarin rashin kwanciyar hankali da wuyansa{2}}.
Ƙarshen mirgina.Rubutun sanyi na matte yana canja wurin rashin ƙarfi zuwa saman rufi, wanda baya shafar ƙarfin haɗin gwiwa amma yana shafar bugu na ƙasa da aikin lamination.
| Substrate | Dyne manufa | Yawan Watt (W/cm²/min) | Mahimmin haɗari |
|---|---|---|---|
| LDPE fim | 38–42 | 6–10 | Maganin baya |
| fim din LLDPE | 38–42 | 8–12 | Tsufa kafin nono |
| BOPP | 38–40 | 5–8 | Slip additive hijirar |
| PET | 45–48 | 3–6 | Sama da{0}magani, foda |
| Aluminum foil | 42–46 | 6–12 | Mirgine lodin thermal |
| Takarda / allo | 40–44 | 4–8 | Danshi a cikin rata |
| Fim ɗin ƙarfe | 44–50 | 3–5 | Lalacewa ga Layer na ƙarfe |
Aunawa da Tabbatar da Maɗaukakin Rufin Fitar
Kuna buƙatar tsarin aunawa guda biyu: ɗaya don saman, ɗaya don haɗin gwiwa.
Don saman, alƙalami na dyne ko gwajin tawada suna ba da saurin tafi/a'a{0}} je karanta. Yi amfani da su a tsakiya da gefuna biyu, nan da nan bayan jiyya da kuma sake kafin nip idan hanyar tana da tsawo. Yi rikodin ƙimar; Juyin jan hankali yana gaya muku electrode ko dielectric yana buƙatar kulawa.
Don haɗin gwiwa, yi amfani da gwajin bawon T{0} akan samfurin da aka warke. Nan da nan bayan shafewar extrusion, mannewa har yanzu yana tasowa, don haka gwajin da aka ɗauka kai tsaye daga layin ya wuce gona da iri ko ƙima na ƙarshe dangane da polymer. Daidaitaccen aikin shine don daidaita samfuran na awanni 24 kafin gwaji.
Bi ƙarfin kwasfa akan saita maki a cikin gungu mai sauƙi. Lokacin da murfin mannewa ya ɓace, log ɗin yana gaya muku ko an canza magani, juzu'i mai yawa ko saurin layin, kuma hakan yana yanke lokacin ganewar asali sosai.
Kuskuren gama-gari waɗanda ke lalata mannewa mai rufin waje
- Yin magani da nisa daga sama.Hanya mai tsayi tsakanin mai magani da mai mutuƙar yana barin ƙasa ta shakata. Matsar da tashar kusa ko ɗaga watt yawa don rama, amma kar a karɓi asarar kawai.
- Sama da{0}magani.Cranking iko don "zama lafiya" yana haifar da ƙarancin iyaka na tarkace oxidised kuma yana rage mannewar murfin extrusion. Ƙari bai fi kyau ba.
- Gwaji kawai a tsakiyar yanar gizo.Adhesion na gefen ya gaza da farko kuma yana bayyana na'urar lantarki ko dielectric lalacewa.
- Yin watsi da zafi.Babban zafi na yanayi yana danne fitarwa kuma yana gabatar da ruwa a cikin tazarar. Saitin lokaci{1}} gyare-gyaren maki abu ne na al'ada a cikin tsire-tsire masu zafi.
- Yin amfani da murfin mirgine kuskure.Nadi mai rufaffiyar siliki - yana aiki da ƙarfin watts mai ƙarfi yana haɓaka waƙoƙin gudanarwa kuma yana ba da jiyya mara daidaituwa, don haka mannewar murfin extrusion ya bambanta a faɗin faɗin.
- Ba duba bayanin da ba a kula da shi ba.Koyaushe kiyaye samfurin sarrafawa na ƙasa iri ɗaya ba tare da magani ba don tabbatar da ainihin ma'aikacin yana yin aikin.
FAQ
Q1: Menene matakin dyne nake buƙata don mannewa mai kyau na extrusion shafi?
Don abubuwan da ake amfani da su na polyolefin, niyya don dynes 38 zuwa 42 a cikin santimita a wurin nip, ba a wurin fitowar magani ba. Don PET da foil, dynes 45 shine manufa mai dadi. Koyaushe tabbatar da gwajin kwasfa, tunda matakin dyne wakili ne, ba manufa ba.
Q2: Zan iya samun karfi extrusion shafi mannewa ba tare da corona magani?
Sai kawai tare da abubuwan da suka riga sun ɗauki chemistry na polar, kamar wasu takardu masu rufaffiyar ko fim ɗin da aka riga aka yi{0}. A kan polyolefins mara kyau, saman da ba a kula da shi ba ba za a iya jika ta dogara da narke ba, kuma mannewa zai gaza a ƙarƙashin kowane damuwa na inji ko zafi.
Q3: Yaya saurin lalata jiyya kafin shafi extrusion?
Lalacewa ya dogara da zafin jiki, zafi da substrate. A cikin sanyi, bushewar yanayi, gidan yanar gizon da aka kula da shi zai iya ɗaukar mafi yawan matakin da ya dace na kwanaki. A kan layi mai zafi mai zafi mai zafi, asarar a cikin 'yan dakiku na tafiya na iya zama dynes da yawa, don haka a takaice hanyar da aka bi da ita.
Q4: Shin mafi girman layin gudu yana cutar da mannewar shafi na extrusion?
Ba idan watt yawa ana gudanar akai akai. Gudun yana rage zaman lokacin fitarwa, don haka dole ne ku ƙara ƙarfin daidai gwargwado. Inda mai magani yake a rufin ƙarfinsa, saurin ya zama maƙasudin ɗaure kuma dole ne ku rage gudu ko karɓar ƙananan magani.
Q5: Me ya sa extrusion shafi mannewa bambanta daga yi zuwa mirgine?
Dalilai na yau da kullun sune bambance-bambancen ma'auni, canje-canje a cikin hana - toshewa ko ɗorawa ƙarar ƙarawa, ɗigo a cikin tazarar lantarki, lalacewa ta wuta, da zafi na yanayi. Saka sakamakon kwasfa akan lamba mai yawa don ware tushen.
Q6: Shin ozone cutarwa ga extrusion shafi mannewa?
Ozone da kanta ba ta da lahani ga haɗin gwiwa, amma ozone wanda ba a sarrafa shi yana nuna rashin daidaituwa, wanda ke canza yanayin rata don haka fitarwa. Babban ozone kuma yana lalata sassa na ƙarfe na kusa da shekaru masu rufin robar.
Q7: Shin zan bi da bangarorin biyu na substrate?
Bi da gefen da ke karɓar sutura. Ana amfani da jiyya na ɓangarorin biyu lokaci-lokaci don sarrafa curl ko don shirya fuska ta baya don tsari na gaba, amma yana ninka nauyin zafin jiki kuma yana ƙara haɗarin toshewa a kan kwancen iska.
Kammalawa
Extrusion shafi manne sakamako ne na tsari, ba kayan abu bane, kuma saitunan jiyya sune mafi girman lefa da kuke sarrafawa. Saita yawan watt daga juzu'i da saurin layi, tabbatar tare da gwajin kwasfa akan samfuran sharadi, kiyaye gajeriyar hanyar da aka kula, da sakamakon log don haka ana iya gani da wuri da wuri.
Fasaha ta Shenzhen Hefeng Jiada tana ba da magungunan korona, injinan jiyya na plasma da tuntuɓar kayan aikin tsabtace gidan yanar gizo waɗanda aka ƙera don shafan extrusion da layin lamination. Raba kayan aikin ku, faɗin layi, saurin da ƙarfin kwasfa mai niyya, kuma injiniyoyinmu za su yi girman tashar jiyya kuma za su ba da shawarar saiti waɗanda ke riƙe da mannewa na extrusion yana gudana bayan gudu.