Txhua qhov kev txiav txim siab tshwj xeeb hauv kev ntim khoom yooj yim thaum kawg nqaim rau ib lo lus nug: dab tsi zaj duab xis lub hnab no yuav tsum tau ua los ntawm? Rau manufacturers khiav aThaum tshav kub kub sealing kub txiav lub hnab ua tshuab, lo lus nug no nqa hnyav dua rau feem ntau. Lub tshuab tsim xav tias yuav muaj cov yeeb yaj kiab uas tuaj yeem thermally fused thiab mechanically cuttinged nyob rau hauv ib tug tshwj xeeb kub thiab thickness qhov rais. Kauj ruam sab nraum lub qhov rais, thiab cov txheej txheem lov - cov ntsaws ruaj ruaj tsis muaj zog, npoo deform, los yog cov hniav tsis tuaj yeem txiav kom huv si.
Kev nkag siab txog cov yeeb yaj kiab yas twg haum rau hauv cov txheej txheem cua sov sealing thaum tshav kub kub txheej txheem- thiab qhov twg yuav tsum tau ua haujlwm ntxiv- yog qhov yuav tsum tau ua. Tsab ntawv xov xwm no qhia txog cov duab toj roob hauv pes tiv thaiv cov kev xav tau ntawm cov khoom siv no.
Thermal Sealing Heat Cutting Process: Yuav Ua Li Cas Zaj Duab Xis Yuav Tsum Tau Ua
Ua ntej yuav tshuaj xyuas cov yeeb yaj kiab tshwj xeeb, nws yuav pab kom nkag siab tias qhov kub ntawm cov khoom siv hluav taws xob ua kom sov lub hnab ua lub tshuab xav tau los ntawm substrate.
Lub tshuab ua ob txoj haujlwm ib txhij ntawm txoj haujlwm txiav: lub tshuab cua sov fuses cov yeeb yaj kiab ntawm ob sab ntawm txoj kab txiav thaum lub hniav - lossis fused sealing hlau - ua rau cov yeeb yaj kiab hnyav. Qhov no txhais tau tias cov yeeb yaj kiab yuav tsum ua kom tau raws li peb txoj hauv kev ib txhij:
- Thermoplastic teb:Cov zaj duab xis yuav tsum soften thiab fuse precisely nyob rau hauv tswj kub thiab siab.
- Ntxuav thermal cais:Cov yeeb yaj kiab yuav tsum tau txiav kom huv si ntawm cov kab sib khi uas tsis muaj kev sib tsoo ntau dhau, stringing, lossis ntug tsim ntawm cov khoom txiav.
Mechanical kev ncaj ncees:Cov yeeb yaj kiab yuav tsum tuav nws qhov ntev los ntawm lub vev xaib tuav, sib khi, thiab txiav lub voj voog yam tsis muaj kev ncab, tawg, lossis delaminating.
Tsis muaj zaj duab xis ua tau raws li tag nrho peb yam zoo kawg nkaus. Kev kos duab ntawm kev teeb tsa tshuab-thiab xaiv zaj duab xis- nyob rau hauv kev xaiv cov khoom uas txo qis kev lag luam-offs rau ib daim ntawv thov.
Polyethylene: Qhov Kev Xaiv Ua Ntej
Polyethylene nyob rau hauv nws ntau yam ntaub ntawv yog lub workhorse ntawm tshav kub sealing kub txiav lub hnab ua. Nws txoj kev siv dav dav tsis yog qhov yuam kev: nws muaj qhov zoo thermal profile, zoo sealability, thiab yog kev lag luam ntawm qhov ntsuas qhov xav tau rau lub hnab ntim khoom.
LDPE (Low{0}}Ntev Polyethylene)
LDPE muaj Vicat softening point ntawm kwv yees li 90℃mus rau 100℃thiab DSC melting point nyob ib ncig ntawm 110 degree. Nyob rau hauv lub tshav kub sealing lub hnab ua tshuab, LDPE feem ntau khiav nrog lub foob bar kub ntawm 120℃thiab 150 degree, ua ib tug tswv yim sealing qhov rais ntawm roughly 30℃mus rau 40 degree.
Lub qhov rais dav no ua rau LDPE zam txim rau khiav. Tus neeg teb xov tooj muaj qhov tseem ceeb hauv chav kho qhov kub thiab txias yam tsis muaj kev pheej hmoo tam sim hauv qab - sealing lossis dhau - cua sov. Foob lub zog rau LDPE ntawm qhov kub thiab txias feem ntau ncav cuag 5 txog 12 N / 15 hli, uas yog txaus rau feem ntau cov khw muag khoom thiab lub hnab ntim khoom siv.
LDPE kuj tau sib xws nrog qhov dav tshaj qhov ntsuas ntawm cov khoom siv. Cov tshuab feem ntau siv LDPE los ntawm 0.010 hli mus rau 0.120 hli yam tsis muaj kev teeb tsa tshwj xeeb.
HDPE (High -Density Polyethylene)
HDPE muaj qhov melting point ntau dua -kwv yees li 130℃-xav txog nws cov qauv crystalline molecular ntau dua. Qhov no txhais tau tias yuav tsum muaj qhov kub thiab txias ntau dua: cov hlua khi feem ntau khiav ntawm 140℃thiab 170 degree.
Qhov kom zoo dua yog lub hnab tawv tawv, muaj zog dua ntawm qhov ntsuas sib npaug. HDPE hnab ntawm tib lub thickness li LDPE yuav nqa hnyav dua yam tsis muaj stretching los yog tearing. Qhov no ua rau HDPE qhov kev xaiv zoo tshaj plaws rau lub hnab ntim khoom thiab rov siv lub hnab ntim khoom uas muaj nuj nqis thiab lub zog.
Kev lag luam tawm -tawm yog qhov kev sib khi me me. Yog li thaum koj khiav HDPE nyob rau sab saum toj ntawm nws qhov kub thiab txias, koj yuav muaj kev pheej hmoo ua rau lub ntsej muag tsis zoo nkauj thiab cov npoo khoov. Yog li kev teeb tsa ntawm lub tshav kub sealing kub txiav lub hnab ua tshuab yuav tsum suav nrog kev ceev PID tuning thiab kev xeem khiav ntawm kev ceev ua ntej koj pib tag nrho cov khoom.
LLDPE (Linear Low-Density Polyethylene)
LLDPE zaum ntawm LDPE thiab HDPE nyob rau hauv qhov ntom ntom, nrog lub melting point nyob ib ncig ntawm 120 degree. Nws cov nqi ntawm lub tshav kub sealing kub txiav kab yog feem ntau nyob rau hauv lub zog foob: LLDPE cov ntaub ntawv muaj zog cov ntsaws ruaj ruaj nyob rau hauv qis kub tshaj LDPE vim nws nqaim molecular hnyav tis, uas ua rau ntau yam zoo li yaj cwj pwm.
LLDPE yog qhov tseem ceeb tshwj xeeb tshaj yog thaum cov chaw tsim khoom xav txo qhov ntsuas qhov ntsuas kub kom ntev lub cua sov lub neej lossis txo qis kev siv hluav taws xob thaum tuav lub zog foob kom txaus. Nws yuav luag ib txwm siv los ua ib txheej hauv ntau- txheej cov yeeb yaj kiab es tsis yog ib leeg substrate rau lub hnab ua.
Polypropylene Zaj duab xis
Polypropylene (CPP)
CPP yog tsim los ntawm casting es tsis yog tshuab raj extrusion, uas muab nws txawv txhua yam thiab thermal zog. Nws cov ntsiab lus melting yog kwv yees li 160℃mus rau 165 degree, thiab nws yuav tsum muaj qhov ntsuas kub ntawm 160℃thiab 200℃kom ua tiav cov ntawv cog lus ruaj khov.
CPP cov ntsiab lus zoo yog qhov pom tseeb thiab noo noo thaiv qhov zoo dua li LDPE. Yog li lub hnab ua los ntawm CPP feem ntau yog siv rau ntim khoom noj qhov twg lub hnab zoo li cas thiab cov khoom thaiv zoo ob qho tib si.
Khiav CPP ntawm lub tshav kub sealing thaum tshav kub kub txiav lub hnab ua tshuab xav tau cov cua sov ntau ntxiv. Yog li qhov no siv lub zog ntau dua thiab hnav tawm qhov sib khi sai dua. Cov ntu txiav kuj xav tau kev saib xyuas ntau zaus, vim tias qhov kub siab dua xav tau rau kev sib khi tuaj yeem ua rau me me ntawm ntug ntawm cov hniav txiav hla kev txuas ntxiv. Cov hniav tu ncua sij hawm yuav tsum luv luv piv rau LDPE khiav.
BOPP thiab OPP (Biaxially Oriented / Oriented Polypropylene)
BOPP nthuav qhia qhov kev sib tw tseem ceeb tshaj plaws rau cov khoom siv hluav taws xob sib khi thaum tshav kub kub. Cov txheej txheem biaxial orientation dlhos cov polymer chains nyob rau hauv ob qho kev qhia, ua rau kev txhim kho tensile zog thiab clarity tab sis tsa qhov zoo melting point thiab nqaim lub qhov rais sealing.
Ntshiab BOPP tsis tuaj yeem ntseeg tau thaum tshav kub kub kaw tib yam li polyethylene. Txheem BOPP yuav tsum muaj cua sov- txheej txheej sealable (feem ntau acrylic lossis PVdC) ntawm ib qho chaw, lossis txheej txheej coextruded. Yog tsis muaj ib qho ntawm cov kev hloov kho no, BOPP yuav tsis tsim ib qho kev ruaj ntseg foob ntawm tus qauv kub sealing kub txiav lub hnab ua tshuab.
Thaum khiav BOPP nrog lub sealable txheej, lub foob bar kub yuav tsum nyob rau hauv qab ntawm lub softening point ntawm lub hauv paus zaj duab xis kom tsis txhob distortion - feem ntau yuav tsum tau precision kub tswj nyob rau hauv ± 3℃. Qhov no ua rau BOPP yog ib qho kev xav tau cov khoom siv uas muab nqi zog rau kev teeb tsa lub tshuab ua tib zoo tab sis ua rau cov txiaj ntsig zoo ntawm lub hnab kom meej meej thiab luam tawm tau rau cov khw muag khoom ntim.
Ntau- Txheej thiab Laminated Films
Feem ntau cov hnab ntim khoom lag luam tsis siv ib qho - txheej zaj duab xis. Multi-txheej txheej coextrusion thiab nplaum laminations tso cai rau cov tuam txhab lag luam sib txuas ua ke ntawm ib qho khoom siv nrog kev thaiv, lub zog, lossis luam tawm ntawm lwm qhov.
Cov qauv siv los ntawm cov khoom siv hluav taws xob sib khi thaum tshav kub kub txiav lub hnab ua tshuab suav nrog:
LDPE tshaj HDPE: Ua ke LDPE qhov kev sib khi yooj yim nrog HDPE qhov tawv.
LLDPE foob txheej hla lub hauv paus ntsiab lus: Optimizes foob lub zog thaum siv ib txheej sab hauv rau cov pa oxygen lossis noo noo barrier.
Metallized zaj duab xis (PET-met/LDPE): Muab txheej thaiv rau cov khoom noj lossis tshuaj siv. Qhov chaw metallized feem ntau tsis tuaj yeem raug kaw ncaj qha; LDPE foob txheej sab hauv.
Thaum khiav laminated films, qhov tseem ceeb txwv yog delamination txaus ntshai. Yog tias zaj duab xis nplaum nplaum ntawm cov khaubncaws sab nraud povtseg tsis muaj zog tshaj lub foob, lub foob yuav tuav tab sis cov khaubncaws sab nraud povtseg yuav sib cais nyob rau hauv kev ntxhov siab- hom tsis ua haujlwm uas nyuaj rau kev tshawb pom thaum tsim khoom thiab txaus ntshai kawg - siv.
Thickness thiab Gauge Considerations
Cov txheej txheem thickness ntau rau lub tshav kub sealing kub txiav lub hnab ua tshuab txawv los ntawm lub tshuab tsim tab sis feem ntau ntog ntawm 0.010 hli thiab 0.100 hli rau cov qauv polyethylene films. Txhawm rau ua qhov no, kev hloov pauv yuav tsum yog:
Hauv qab 0.010 hli (10 microns): Ultra- zaj duab xis nyias yog ib qho nyuaj rau kev noj zaub mov kom ntseeg tau los ntawm lub tshuab lub vev xaib qhia qhov system. Thiab nws yuav tsis muaj cov khoom siv txaus rau lub foob pob ua kom muaj kev sib raug zoo. Yog li koj xav tau cov tshuab tshwj xeeb nrog kev tswj xyuas qhov web nruj heev.
Saum toj no 0.100 hli (100 microns): Thicker films yuav tsum proportionally siab foob kub thiab ntau aggression txiav mechanisms. Cov khoom sib khi yuav tsum tau hloov cov cua kub txaus los ntawm cov khoom siv ntau dua, uas txuas ntxiv lub sijhawm nyob hauv tsev thiab tuaj yeem txo cov kab nrawm.
Lub tshav kub sealing kub txiav lub hnab ua tshuab configured rau HDPE thiab LDPE nyob rau hauv lub 0.015 hli mus rau 0.050 hli ntau yam sawv cev rau cov feem ntau ntau thiab zam txim ntau lawm teeb. Cov neeg ua haujlwm khiav tawm sab nraud qhov no yuav tsum cia siab tias yuav nqis peev sijhawm rau kev txhim kho cov txheej txheem thiab cia siab tias yuav siv sijhawm luv luv ntawm kev sib khi thiab txiav cov khoom.
Tshwj xeeb thiab Emerging Films
PLA (Polylactic Acid)
PLA yog biodegradable biopolymer muab los ntawm pob kws hmoov nplej los yog qab zib. Nws seals nyob rau hauv lub qhov rais nqaim heev -kwv yees li 100℃mus rau 120℃- uas ua rau nws sib xws nrog qis -kub kub sealing configurations. Txawm li cas los xij, PLA muaj kev nyiam mus rau "kev thaiv," qhov twg cov yeeb yaj kiab uas nyob ib sab fuse hauv yob, ua rau muaj teeb meem noj.
Ntawm lub tshav kub sealing lub hnab ua tshuab, PLA xav tau ceev nrooj tswj. Thiab nws yuav xav tau kev tiv thaiv - thaiv cov khoom ntxiv hauv cov yeeb yaj kiab sib xyaw. Yog li kev foob lub zog kuj feem ntau qis dua li cov polyethylene zoo sib xws. Tom qab ntawd qhov no txwv nws txoj kev siv rau lub teeb ntim cov haujlwm.
Nylon (Polyamide)
Nylon zaj duab xis muaj cov thermal tsis kam thiab zoo heev puncture zog, ua rau lawv txaus nyiam rau hnyav los yog ntse -edged khoom ntim. Txawm li cas los xij, nylon absorbs ya raws tau yooj yim, thiab cov nylon ntub dej yuav tsis muab khi ruaj khov. Ua ntej- ziab ntawm lub vev xaib zaj duab xis yog feem ntau yuav tsum tau, ntxiv cov txheej txheem txheej txheem uas tsis tshua muaj nrog cov txheej txheem polyethylene khiav.
Matching Films rau Machine Configuration
Cov lus pom zoo los ntawm cov ntaub ntawv kev lag luam kev lag luam yog ncaj qha: pib nrog LDPE lossis HDPE rau qhov qis tshaj - qhov kev pheej hmoo nkag. Cov ntaub ntawv no muaj cov txheej txheem dav tshaj plaws, qhov kev zam txim siab tshaj plaws thermal profiles, thiab cov yeeb yaj kiab uas muaj ntau tshaj plaws tau ua kom zoo rau cov cua sov sealing kub txiav lub hnab ua khoom siv.
Raws li cov kev xav tau ntau lawm dhau los ua qhov tshwj xeeb ntau dua -kev thaiv siab dua, qhov pom tseeb dua, lub zog ntau dua- txav mus rau LLDPE blends thiab ntau- txheej coextrusion. Reserve CPP, BOPP nrog sealable txheej, thiab cov yeeb yaj kiab tshwj xeeb rau cov ntawv thov uas lawv cov khoom tshwj xeeb yog qhov tsim nyog thiab qhov chaw ua haujlwm ntawm cov txheej txheem nruj dua yog tsim nyog.
Thaum qhia txog lub tshav kub sealing kub txiav lub hnab ua tshuab rau ntau- cov khoom siv, paub meej tias lub tshuab ntsuas kub tswj kev txhawb nqa tag nrho ntawm koj cov ntaub ntawv zaj duab xis thiab qhov ceev - hloov sealing bar configurations muaj. Tus nqi peev ntxiv ntawm lub tshuab ntau yam feem ntau them rau nws tus kheej hauv kev hloov pauv lub sij hawm txuag thaum cov khoom sib tov sib txawv ntau hom yeeb yaj kiab.
Common Film-Cov teeb meem ntsig txog
Kev nkag siab qhov twg cov yeeb yaj kiab ua tsis tiav ntawm cov cuab yeej no pab daws teeb meem thiab tiv thaiv cov teeb meem zoo:
| Teeb meem | Tej yam ua rau | Zaj duab xis-Khoom muaj feem cuam tshuam |
|---|---|---|
| Lub foob tsis muaj zog lossis tsis sib xws | Tsis txaus seal bar kub | Zaj duab xis ntsuas variation; cua txias tsis sib xws |
| Edge stringing los yog buildup | Kub kub ntau dhau; qias neeg qias neeg | Zaj duab xis muaj cov wax siab los yog nplawm additive |
| Zaj duab xis kua muag thaum pub mis | Ntau qhov web nro; ntsuas variation | Tsis zoo zaj duab xis longitudinal directionality |
| Foob delamination | Kub siab dhau lawm, ua kom tsis muaj zog ntawm cov khaubncaws sab nraud povtseg | Adhesive tsis ua hauj lwm nyob rau hauv multilayer zaj duab xis |
| Thaiv hauv yob | Zaj duab xis absorbing noo noo los yog siab ambient humidity | PLA lossis PA zaj duab xis tsis muaj tshuaj tiv thaiv -block additive |
| Bag dimension inconsistency | Zaj duab xis stretching thaum lub web thauj | Tsis txaus zaj duab xis modulus ntawm khiav kub |
FAQ
Lub tshav kub sealing kub txiav lub hnab ua tshuab khiav biodegradable films?
Yog lawm, PLA thiab lwm yam polyesters biodegradable tuaj yeem ua tiav, tab sis lawv yuav tsum tau hloov kho lub tshuab teeb tsa - txo qis qhov ntsuas kub thiab hloov kho lub vev xaib. Tus neeg muag khoom zaj duab xis yuav tsum muab cov txheej txheem ua haujlwm tshwj xeeb rau qib biodegradable hauv kev siv.
Dab tsi yog cov yeeb yaj kiab tuab tshaj plaws uas cov cuab yeej no tuaj yeem ntseeg tau?
Cov tshuab txheem txheem feem ntau tuav txog 0.100 hli (100 microns) ntawm LDPE lossis HDPE yam tsis muaj kev hloov kho tshwj xeeb. Dhau li ntawm qhov no, saib rau hnyav- cov haujlwm teeb tsa nrog lub sijhawm nyob ntev ntev thiab cov hlua khi txuas ntxiv.
Cov xim zaj duab xis puas cuam tshuam rau kev sib khi?
Pigmented films-tshwj xeeb yog xim dub, dawb, thiab xim hlau- tej zaum yuav xav tau kev hloov kho kub vim tias cov xim pigment cuam tshuam rau thermal conductivity. Cov xim dawb feem ntau tsa qhov kev sib khi kom zoo; carbon dub txo nws. Kev xeem khiav nrog cov xim tshwj xeeb yog ib txwm pom zoo.
Vim li cas tib qib zaj duab xis tsim cov foob sib txawv ntawm qhov sib txawv?
Seal bar nyob lub sij hawm- lub sij hawm ntev ntawm zaj duab xis nyob rau hauv siab thiab cua sov- hloov nrog kab ceev. Kev qeeb qeeb nce nyob hauv thiab tsim cov ntsaws ruaj ruaj ruaj khov mus txog qhov taw tes; ntau dwell overheats zaj duab xis. Cov tshuab niaj hnub no feem ntau nrog servo-tswj nyob twj ywm them rov qab tau txais, tab sis cov qauv qub yuav xav tau kev hloov kho thaum hloov cov khoom ceev.
Dab tsi zaj duab xis yuav tsum tau thov los ntawm kuv tus neeg muag khoom rau cov khoom siv cua sov sealing cua sov?
Qhia meej rau qib zaj duab xis lub foob qhov pib kub, pom zoo foob bar qhov kub thiab txias, coefficient ntawm kev sib txhuam (COF), ntsuas qhov siab, thiab seb puas muaj cov tshuaj tiv thaiv los yog cov khoom ntxiv. Cov kev txwv no cuam tshuam ncaj qha rau cov txheej txheem teeb tsa thiab tso tawm qhov sib xws ntawm lub tshav kub sealing lub hnab ua tshuab.
Xaus
Polyethylene nyob rau hauv nws cov LDPE, HDPE, thiab LLDPE cov ntaub ntawv npog feem ntau ntawm daim ntawv thov ntawm lub tshav kub sealing tshav kub txiav lub hnab ua tshuab, thiab manufacturers tau zoo- pab los ntawm pib lawv cov khoom ntsuam xyuas nrog cov pov thawj substrates. CPP nthuav dav qhov kub thiab txias lub hnab ntawv ntawm tus nqi ntawm cov txheej txheem siab dua. BOPP xav tau txheej txheej sealable los yog coextrusion los koom rau hauv kev sib khi thaum tshav kub kub. Ntau - txheej txheej qhib kev sib txuas ntawm cov khoom uas tsis muaj ib zaj yeeb yaj kiab ua tiav ib leeg, tab sis lawv qhia txog kev pheej hmoo delamination uas yuav tsum tau tswj hwm los ntawm cov yeeb yaj kiab tshwj xeeb thiab cov txheej txheem tswj.
Qhov kev txiav txim siab ua yeeb yaj kiab kawg ua rau tag nrho cov kev lag luam tsim khoom lag luam. Ib zaj duab xis uas khiav huv si ntawm 80 meters ib feeb nrog tsis tshua muaj hniav hloov yuav outperform ib tug technically superior zaj duab xis uas yuav tsum tau hloov tas li. Kev xaiv zaj duab xis txhais tau hais tias ntsuas kev ua tau zoo ntawm cov txheej txheem kev ruaj ntseg-thiab rau feem ntau lub hnab ntim cov chaw tsim khoom siv lub tshuab ua kom sov sealing kub txiav lub hnab ua tshuab, polyethylene-raws li cov qauv tseem yog txoj hauv kev txhim khu kev qha tshaj plaws rau cov khoom tsim tawm.
Qhov chaw:
- Packaging Technology and Engineering Handbook - Seal pib qhov kub thiab txias cov ntsiab lus thiab thermal sealing qhov rais txhais rau cov ntaub ntawv ntim tau yooj yim.
- Phau ntawv Journal of Plastic Film & Sheeting - Cov ntaub ntawv pov thawj lub zog thiab thermal sealing parameter tsom xam rau LDPE, HDPE, thiab polypropylene zaj duab xis qauv.
- Industrial Flexible Packaging Systems - Kev qhia tshwj xeeb rau qhov ntsuas kub ntawm qhov ntsuas kub thiab ntsuas kev sib raug zoo thoob plaws qib polyethylene zaj duab xis.
- Polymer Science thiab Technology Peb Hlis - Cov qauv molecular cuam tshuam rau kev sib khi ntawm cov cua sov: LDPE, HDPE, LLDPE, thiab polypropylene thermal profiles.
- International Packaging Innovation Council - Cov txheej txheem xaiv cov khoom siv thiab cov lus pom zoo rau kev ua yeeb yaj kiab rau cov txheej txheem kub sealing hnab.
