Hais txog Pinholes & Post-Retorting Expansion nyob rau hauv 8079 Aluminium Ntawv Nyiaj rau High-Tsub Retort Pouches (6.50μm / O Kub): Rolling Control Strategies

1. Lub hauv paus rau phau ntawv: Kev xav tau kev ua haujlwm ntawm 8079 Aluminium Ntawv Nyiaj rau High-Tsub Retort Pouches thiab Qhov Tseem Ceeb ntawm Pinhole Management

High-temperature retort pouches yog cov khoom tseem ceeb rau kev ntim khoom noj kom tsis muaj menyuam (E.G., nqaij, soy khoom, Yuav tsum tau 121-135 ℃ high-pressure steam sterilization rau 30-60 feeb). Tshuav, tus 8079 aluminium ntawv ci rau high-temperature retort pouches (6.50μm tuab, Saib Tauj, i.e., tag nrho anealed) Hauv lawv cov txheej txheem sib xyaw ua lub luag haujlwm tseem ceeb hauv kev thaiv cov pa oxygen (kis tau tus mob ≤0.1cm³ /(Cov Neeg Paus Tsev Neeg Malakaus)) thiab dej vapor (kis tau tus mob ≤0.1g /(24.)).

Lub O-temper 8079 hlau alloy (Mn ntsiab lus 0.8%-1.2%) muaj elongation ≥30% thiab tawm lub zog ≤110MPa, ua rau nws haum rau kev sib sib zog nqus nqus thiab kub-sealing thaum lub sij hawm retort hnab lamination. Txawm li cas los, dov lub nyias 6.50μm gauge yog nquag rau pinholes-yog pinhole txoj kab uas hla >20μm, chav tuaj yeem nkag mus rau cov ntawv ci thaum tsis muaj menyuam, ua rau zaub mov lwj. Xav paub ntau ntxiv, pinholes zoo li nthuav dav hauv qab cua sov tom qab retorting (ntawm 121 ℃, Lub thermal expansion coefficient ntawm aluminium ntawv ci yog 23.1 × 10⁻⁶ / ℃, thiab cov pinholes me me tuaj yeem nthuav mus rau ntau dua 30μm), compromising ntim hermeticity. Raws li 2024 ntim cov ntaub ntawv kev lag luam, ib lub lag luam raug kev txom nyem dhau 5 lab yuan nyob rau hauv poob vim cov khoom rov qab los ntawm substandard pinholes nyob rau hauv 8079 aluminium foil rau high-temperature retort pouches. Yog li ntawd, optimizing cov txheej txheem dov yog qhov tseem ceeb los tswj cov pinholes ≤20μm thiab tiv thaiv kev nthuav dav tom qab retorting.

2. Mechanisms ntawm Pinhole Tsim nyob rau hauv 8079 Aluminium Ntawv Nyiaj rau High-Tsub Retort Pouches (6.50μm / O Kub) Thaum Rolling

Hauv paus, pinholes hauv nyias 6.50μm txhuas ntawv ci (txhais los ntawm GB/T 31985-2015 raws li qhov nkag qhov nrog txoj kab uas hla >5μm) feem ntau stem los ntawm peb hom tsis xws luag thaum dov. Cov tsis xws luag, tsom xam ua ke nrog cov khoom ntawm 8079 alloy thiab O-temper dov yam ntxwv, muaj cov ncauj lus kom ntxaws hauv cov lus hauv qab no:

Lub rooj 1: Kev faib tawm thiab ua rau Pinholes hauv 8079 Aluminium Ntawv Nyiaj (6.50μm / O Kub) rau High-Temperature Retort Pouches Thaum Rolling

Tshwj xeeb, xeem cov ntaub ntawv qhia tau hais tias thaum lub ingot inclusion tus nqi >0.3%, tus tshaj tus qauv ntawm raw khoom tsis xws pinholes nyob rau hauv no aluminium foil ncav cuag 35%; thaum dov ceev >800m / kuv, qhov kev faib ua feem ntawm cov txheej txheem mismatch pinholes nce mus dhau 40%. Qhov no qhia txog qhov xav tau rau kev tswj hwm rau txhua yam tsis xws luag.

3. Core Rolling Technologies rau Tswj Pinholes ≤20μm (Theem-by-Stage Optimization)

Hais txog cov mechanisms saum toj no, ib tug full-process system centered rau “Raw Khoom Siv Rawific – Txheej txheem tsis – kev tswj cov khoom siv – tswj nruab nrab” yuav tsum tau tsim. Qhov system no ua kom cov pinholes ≤20μm hauv 8079 aluminium foil rau high-temperature retort pouches tom qab dov, thaum tso lub hauv paus rau kev tiv thaiv kev nthuav dav tom ntej:

(1) Raw Khoom Pretreatment: Blocking Defect Transmission ntawm Qhov Chaw

Thawj kab ntawm kev tiv thaiv pinholes yog nruj raw khoom tswj.

1. Ingot Purification Txheej Txheem:

• • txais yuav “nitrogen refining + ob-txheej ceramic filtration” (Upper txheej 50μm, qis txheej 20μm) tshem tawm Al₂O₃ inclusions thiab hydrogen pores, tswj ingot inclusion tus nqi ≤0.05% thiab porosity ≤0.02%;

• • Ingot homogenization: Tuav ntawm 580-600 ℃ rau 6-8 sij hawm los xyuas kom meej Mn faib, zam lub zos nkig tawg thaum dov vim muaj kev sib cais sib cais.

2. Ingot Flaw Detection thiab tshuaj ntsuam xyuas: Siv lub eddy tam sim no flaw detector (rhiab heev ≥5μm) kom tsis lees txais cov ingots nrog cov kev tsis zoo sab hauv, kom ntseeg tau 100% kev tsim nyog tus nqi ntawm cov khoom siv raw nkag rau hauv cov txheej txheem dov.

(2) Txias Rolling Parameter Optimization: Ua kom haum rau 8079-O Temper Properties

Tsiv mus rau txoj kev dov nws tus kheej, parameter optimization yog qhov tseem ceeb kom tsis txhob muaj cov txheej txheem tsis sib haum nrog pinholes.

1. Stepwise txo tus nqi faib (rau 6.50m gauge, tag nrho tus nqi txo 96.8%, siv 1.98mm cam khwb cia-dov coils ua raw khoom):

Txhawm rau ua tiav qhov tseeb thinning thaum tswj pinholes, tus nqi txo yog faib nyob rau hauv theem, raws li qhia hauv Table 2:

Lub rooj 2: Txias Rolling txheej txheem Parameters rau txhua theem ntawm 8079 Aluminium Ntawv Nyiaj (6.50μm / O Kub) rau High-Temperature Retort Pouches

Tsab ntawv: Txawm hais tias tus nqi txo nyob rau hauv Finish Rolling 2 yog siab, txo qhov ceev (650-700m / kuv) thiab nce nro (150-180N / m) Ua kom cov yas txuas ntxiv ntawm 8079-O temper aluminium ntawv ci, zam cov txheej txheem mismatch pinholes.

2. Rolling Oil Temperature Control: Khaws 35-45 ℃ kom ruaj khov dov roj viscosity (ISO VG22, viscosity 20-25mm² / s ntawm 40 ℃). Qhov no txhim kho lubricity thiab txo cov yob nplaum, ib qho tshwm sim rau qhov tsis xwm yeem pinholes.

(3) Rolling thiab Rolling Oil Management: Tshem tawm cov kab mob sib kis-Induced Pinholes

Ib yam tseem ceeb rau kev tswj xyuas parameter yog tswj cov khoom siv dov thiab xov xwm, uas ncaj qha cuam tshuam rau kev kis kab mob-induced pinholes.

1. Roll Precision Control:

• • Cov yob tiav yog ua los ntawm DC53 tuag steel, quenched rau HRC62-65 hardness, nrog nto roughness Ra 0.2-0.4μm thiab cylindricity ≤0.002mm tom qab sib tsoo. Qhov no minimizes khawb replication ntawm cov ntawv ci;

• • Tom qab dov 50,000 meters ntawm aluminium ntawv ci, ua on-line flaw nrhiav kom tau cov yob siv lub laser micrometer. Yog khawb >5μm kuaj pom, nres lub tshuab rau kev sib tsoo tam sim ntawd kom tsis txhob muaj pinhole ntxiv.

2. Rolling Oil Purification System: Peb-theem filtration system yog siv los tshem tawm impurities, nrog cov kev txwv tshwj xeeb qhia hauv qab no:

Lub rooj 3: Parameters ntawm Peb-theem filtration System rau Rolling Roj ntawm 8079 Aluminium Ntawv Nyiaj rau High-Tsub Retort Pouches

Cov txheej txheem no ua kom cov roj dov huv huv yog khaws cia hauv qab NAS Qib 8, tiv thaiv cov khib nyiab hlau los ntawm nias rau hauv cov ntawv ci kom tsim cov kab mob sib kis-vim cov pinholes.

4. Lub luag haujlwm ntawm Rolling txheej txheem hauv kev tiv thaiv tom qab-Retorting Pinhole Expansion (Mechanisms thiab Verification)

Tshaj pinhole tswj thaum dov, cov txheej txheem dov kuj tseem ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv pinhole nthuav dav tom qab kub kub retorting. High-temperature retorting (121-135℃) ua rau thermal stress thiab yas deformation hauv aluminium ntawv ci; Cov txheej txheem dov tsis tsim nyog tuaj yeem ua rau lub pinhole nthuav dav. Cov txheej txheem dov rau 8079 aluminium foil rau high-temperature retort pouches tuaj yeem inhibit pinhole expansion los ntawm optimizing microstructure thiab sab hauv kev ntxhov siab:

(1) Kev Tiv Thaiv Mechanisms: Grain Refinement thiab Internal Stress Relief

Ob tug tub ntxhais mechanisms underpin anti-expansion nyhuv ntawm cov txheej txheem dov:

1. Grain Refinement rau Tswj Thermal Deformation: Los ntawm nruab nrab annealing (tom qab nruab nrab dov, tuav ntawm 580-600 ℃ rau 4-6 xuabita) thiab ua tiav dov nro tswj, qhov loj ntawm cov ntawv ci yog stabilized ntawm 5-8μm (piv rau cov pa 10-15μm nplej rau O temper). Aluminium ntawv ci nrog cov nplej zoo ua kom pom zoo dua thermal expansion, tiv thaiv lub zos stretching ntawm pinhole npoo thaum lub sij hawm retorting thiab txwv expansion rau ≤3μm.

2. Tom qab Rolling Stress Relief Annealing: Ntxiv rau, tom qab ua tiav dov, tuav ntawm 200-220 ℃ rau 2-3 cov sij hawm los txo cov kev ntxhov siab hauv kev ntxhov siab (txo los ntawm 150MPa mus rau qis dua 50MPa). Kev ntxhov siab ntau dhau ua rau qhov tsis sib xws ntawm cov ntawv ci thaum lub sij hawm retorting, “rub” pinholes los nthuav; Kev ntxhov siab tuaj yeem txo qhov kev nthuav dav los ntawm 60%.

(2) Muaj pov thawj: Pinhole Control thiab Expansion Testing

Txhawm rau txheeb xyuas qhov ua tau zoo ntawm cov txheej txheem no, ib lub tuam txhab tau txais cov txheej txheem saum toj no los tsim 8079 aluminium foil rau high-temperature retort pouches (6.50μm / O kub), nrog cov txiaj ntsig kev sim qhia hauv qab no:

Lub rooj 4: Kev sib piv ntawm 8079 Aluminium Ntawv Nyiaj (6.50μm / O Kub) rau High-Temperature Retort Pouches Ua ntej thiab Tom Qab Kev Ua Haujlwm Zoo

Tsab ntawv: Tus nqi expansion yog txhais raws li “tus naj npawb ntawm pinholes nrog txoj kab uas hla >20μm tom qab retorting / Tag nrho cov pinholes × 100%”. Tom qab optimization, cov ntawv ci ua tau raws li qhov yuav tsum tau muaj rau cov hnab ntim khoom kub-kub retort, nrog synchronized txhim kho hauv kev cuam tshuam kev ua tau zoo-ntxiv rau kev lees paub cov txheej txheem kev nkag siab.

5. Cov lus xaus thiab Outlook

Hauv cov ntsiab lus, kom ua tiav pinhole tswj (≤20μm) thiab tiv thaiv post-retorting expansion rau 8079 aluminium ntawv ci rau high-temperature retort pouches (6.50μm / O kub), ib tug dov txheej txheem system ntawm “Raw Khoom Siv Rawific – txo qis qis – precision yob – kev nyuaj siab nyem annealing” yog qhov tseem ceeb: ① Ingot suav tus nqi ≤0.05% thiab dov roj huv hauv qab NAS Qib 8 yog qhov tseem ceeb; ② Dov ceev ntawm 650-700m / min thiab nro ntawm 150-180N / m nyob rau hauv tiav Rolling 2 yog qhov tseem ceeb rau kev tswj tus pinhole; ③ Intermediate annealing rau grain refinement (5-8μm) thiab tom qab dov kev ntxhov siab nyem yog qhov tseem ceeb rau kev tiv thaiv kev nthuav dav.

Saib tom ntej, Cov lus qhia kev txhim kho yav tom ntej tsom mus rau peb yam los txhim kho cov txheej txheem kev ua tau zoo: ① Intelligent Pinhole Monitoring: Nruab on-line laser pinhole detectors (precision 1m) ntawm qhov kawg dov qhov hluav taws xob rau lub sij hawm tawm tswv yim thiab cov txheej txheem hloov, txo kev cia siab ntawm phau ntawv tshuaj xyuas; ② Nanomodification ntawm Rolling Oil: Ntxiv nano-MoS₂ hais (2-5μm diam) txhawm rau txhim kho lubricity thiab txo cov pinholes uas tshwm sim los ntawm yob nplaum; ③ Alloy Micro-Alloying: Ntxiv 0.02%-0.03% Qhov ntawd yog nws 8079 alloy rau refine ingot nplej thiab txo qhov tsis xws luag kis tau tus mob los ntawm qhov chaw.

Kawg, lub hauv paus ntsiab lus tseem ceeb rau cov txheej txheem dov ntawm 8079 aluminium foil rau high-temperature retort pouches yuav tsum “coj pinhole tswj raws li lub hom phiaj thiab tiv thaiv thermal expansion raws li ib tug extension”. Los ntawm multi-parameter synergy, nws sib npaug lub ductility thiab seem stability ntawm nyias-gauge aluminium ntawv ci, Ua kom tsis muaj menyuam muaj kev nyab xeeb thiab ntim kev ntseeg siab ntawm cov hnab ntim kub-kub retort.