Dejavniki, ki vplivajo na fino zvijanje aluminijaste folije za cigarete

Dejavniki, ki vplivajo na fino zvijanje aluminijaste folije za cigarete

Aluminum foil is light in weight and exhibits excellent properties in terms of corrosion resistance, odpornost na vlago, and UV resistance. It is also recyclable, easy to bend and print, and has good thermal stability. Zato, it is widely used in cigarettes, zdravilo, gospodinjstvo, electronics and other fields. Using aluminum foil packaging: ① Save a lot of resources; ② Improve the grade and aesthetics of packaging, thereby effectively promoting the consumption and application of aluminum foil.

Aluminum foil for cigarettes

Cigarette packaging is a very important part of cigarette production and the last process. In the entire process of cigarette production, circulation and consumption, the quality of packaging materials plays a very important role in maintaining the quality of cigarette products, promoting consumption, and guiding consumption. Compared with other commodities, cigarette packaging materials require greater specificity, no odor, should be non-toxic and harmless to the human body, and should have moisture resistance and isolation properties. Aluminum foil has all the properties required for cigarette packaging. In the process of application in the cigarette industry, it is often supplied with a thickness of (6~6.5) μm. In the subsequent process, it needs to go through many steps such as compounding, barvanje, pressing, drying, itd. to finally form qualified packaging materials. In order to ensure the yield rate of the subsequent compounding step, the quality of the aluminum foil raw material must meet the indicators, especially the plate shape of the aluminum foil must be straight, so as to avoid wrinkling during compounding, resulting in broken strips and serious economic losses.

The rolling of aluminum foil is quite special, especially in the middle and fine rolling stage, the thickness of the aluminum foil is very small, and the size reaches the micron level. S povečanjem pritiska med postopkom valjanja, valji so elastično deformirani, valjani material pa plastično deformiran, in slednje je bolj verjetno. Ko so valji elastično sploščeni, to je treba jemati resno, ker bo resno vplivalo na postopek valjanja aluminijaste folije. Na splošno, alu folija je brezšivno zvita, debelina na mikronski ravni pa je dosežena z nadzorom parametrov napetosti odvijanja in parametrov hitrosti valjanja. Med postopkom valjanja, spremembe dejavnikov, ki vplivajo na postopek zvijanja, bodo določile, ali je kakovost izdelkov iz tobačne folije ustrezna in ali izpolnjuje zahteve kupcev. V procesu valjanja je veliko dejavnikov, ki vplivajo na proces, predvsem kotalno olje, delovni zvitki, nadzor oblike plošče, in kakovost originalne oblike plošče dobavljene gredice. Zato, sistematična študija dejavnikov, ki vplivajo na proces končnega valjanja v aluminijasti tobačni foliji, ima pomemben usmerjevalni pomen za nadzor proizvodnega procesa končnega valjanja v drugih izdelkih iz aluminijaste folije.

Trial plan

1.1 Test materials

Elektrolitsko ulivanje in valjanje aluminija, izbrano za preskus, je surovec aluminijaste folije za cigarete. Kemična sestava je 1235 zlitina. Specifikacija prazne aluminijaste folije je (0.24×1350) mm. Testna količina je 50 t, število testnih zvitkov je 16, in sestavo 1235 zlitine je prikazano v tabeli 1.

1.2 Test equipment

Testna oprema vključuje predvsem nemški Achenbach 1400 mm srednji končni rezkar, luknjičasta škatla, spletni detektor oblike plošč, and online surface detection equipment.

1.3 Experimental content

In order to study the process influencing factors, action mechanisms and countermeasures in the process of medium and fine rolling of aluminum foil for cigarettes, this experiment set up 4 research schemes, and the final rolling thickness of the product was 0.006 mm:

• ① Aiming at the influence of rolling oil on product quality, the influence of rolling oil on product quality was analyzed;
• ② Aiming at the influence of working roll roughness and convexity on product quality, the influence of different working roll process parameters on product quality was analyzed;
• ③ Aiming at plate shape control, the influence of different control methods on plate shape was studied;
• ④ Aiming at the original plate shape of aluminum foil billet, proučen je bil vpliv gredice aluminijaste folije na kasnejše srednje in fino valjanje. Specifični diagram poteka procesa je prikazan na sliki 1.

Results and discussion

2.1 Analysis and control measures of the impact of rolling oil on product quality

2.1.1 Analiza vpliva na kakovost izdelkov

Med proizvodnim procesom finega valjanja elektrolitskega litja in valjanja aluminija tobačna aluminijasta folija, Glavni funkciji kotalnega olja sta mazanje in hlajenje. Spremembe v razmerju kotalnega olja, čistost olja za valjanje, postopek uporabe olja za valjanje, itd. vplivalo na kakovost tobačnih izdelkov iz aluminijaste folije, zaradi česar je težko zagotoviti kakovost tobačnih izdelkov iz aluminijaste folije, in v hujših primerih, povzroča razrez. Končna debelina tobačnih izdelkov iz aluminijaste folije je 0.006 mm. Za doseganje stabilnega valjanja in enakomerne debeline izdelka, učinkovito procesno mazanje in ustrezen koeficient trenja sta učinkovita ukrepa za nadzor najmanjše debeline aluminijaste folije, ki jo je mogoče valjati. Zvijanje tobačne aluminijaste folije ima strožje zahteve glede najmanjše debeline, ki jo je mogoče zviti, kar je predpogoj za proizvodnjo izdelkov iz tobačne aluminijaste folije z ustrezno debelino. Izboljšanje mazalne sposobnosti olja za valjanje se doseže predvsem s prilagoditvijo razmerja olja za valjanje.

Poleg tega, da bo razmerje dodajanja olja za valjanje vplivalo na kakovost izdelka, čistost olja za valjanje in postopek uporabe olja za valjanje bosta prav tako močno vplivala na kakovost izdelkov iz tobačne aluminijaste folije. Med postopkom finega valjanja aluminijaste folije za tobak, it is generally easy to mix with mechanical hydraulic oil and oil mist, other mechanical oils, itd. V tem primeru, the purity of the rolling oil is greatly affected, and its physical and chemical properties are very likely to change, thereby affecting the rolling of aluminum foil for tobacco, resulting in the inability to guarantee product quality.

The rationality of the rolling oil use process is the key control factor to ensure the online plate shape and surface quality of aluminum foil products for tobacco. Its use process parameters mainly include rolling oil temperature, rolling oil pressure and rolling oil flow. Whether the setting is reasonable directly determines whether the aluminum foil products for tobacco can be rolled into finished products.

2.1.2 Control measures

By adding a certain ratio of alcohol, kisline in estra v bazno olje za kotalno olje, moč oljnega filma olja za valjanje je mogoče izboljšati. torej, mogoče doseči enotno in ustrezno debelino oljnega filma. Praksa kaže, da je primernejše dodano razmerje, če je alkohol kontroliran (7.0-8.0) mgKOH/g, kontrolna vrednost kisline je ≤1,4 mgKOH/g, in ester je kontroliran pri (5.5-6.5) mgKOH/g.

Z rednim merjenjem fizikalno-kemijskih lastnosti olja za valjanje in spremljanjem kazalnikov delovanja olja za valjanje, indikatorji učinkovitosti olja za zvijanje se ne spreminjajo in vplivajo na zvijanje izdelkov iz aluminijaste folije za cigarete. Ob istem času, oblikovani so ustrezni predpisi o filtraciji olja za valjanje, ki zagotavljajo, da je olje za valjanje filtrirano in prečiščeno po urniku. Med filtracijo in čiščenjem, the rolling mill is not allowed to start production to prevent the reflux of dirty oil.

For the rolling of aluminum foil for cigarette packaging, the oil temperature control parameters of the rolling oil in the intermediate and fine rolling are different. In the intermediate rolling process, the best process parameter range of the rolling oil temperature is (30-40) ℃, the rolling oil pressure is stably controlled at (4.0-5.0) Bar, and the oil flow is accurately controlled at 50%-60%; in the fine rolling process, the best process parameter range of the rolling oil temperature is (45-50) ℃, the rolling oil pressure is stably controlled at (4.5-5.0) Bar, and the oil flow is accurately controlled at 45%-50%. Ob istem času, the use of rolling oil should be monitored and recorded. If the rolling oil quality cannot meet the rolling production of aluminum foil for cigarettes, the rolling oil can be replaced.

2.2 Analysis and control measures of the influence of different working roll process parameters on product quality

2.2.1 Analysis of the influence of process parameters on product quality

V procesu zvijanja aluminijaste folije za cigarete, Parametri procesa hrapavosti in konveksnosti delovnega valja valjarne so odločilni dejavniki, ki vplivajo na kakovost izdelkov iz aluminijaste folije, especially for aluminum foil products for cigarettes, katerih debelina valjanja je običajno nadzorovana pri (0.006~0,007) mm, tehnični parametri hrapavosti in konveksnosti delovnega valja valjarne pa morajo biti višji. V dejanskem procesu proizvodnje aluminijaste folije za cigarete, je treba zagotoviti, da je hrapavost delovnega valja valjarne med postopkom mletja enakomerna, da se prepreči nedoslednost hrapavosti zgornjega in spodnjega delovnega valja, zaradi česar bo postopek valjanja zdrsnil in proizvodnja valjanja ne bo mogla biti realizirana. Ob istem času, parametre hrapavosti delovnega valja valjarne je treba natančno nadzorovati, in hrapavost ne sme biti previsoka, ker previsoka povzroči, da se drobne napake na površini izdelka med zvijanjem aluminijaste folije za cigarete razširijo, nastajanje napak v obliki lukenj, ki je nagnjen k zlomu pasu. Poleg tega, če je hrapavost površine delovnega valja previsoka, površinska obdelava izdelka iz aluminijaste folije ne bo dovolj, ki ne morejo zadostiti kupčevim zahtevam uporabe. Če je hrapavost delovnega valja valjarne prenizka, hitrost valjanja valjarne bo počasna, kar močno zmanjša učinkovitost proizvodnje.

Parametri kronskega procesa delovnega valja valjarne imajo velik vpliv na obliko plošče izdelkov iz aluminijaste folije za cigarete. Na splošno, nastavitev krone delovnega zvitka je različna glede na zahteve glede širine izdelka. V dejanskem proizvodnem procesu, oblika valja delovnega valja se spremeni s hidravličnim upogibanjem valja. Hidravlično upogibanje valjev v glavnem vključuje hidravlični cilinder, ki uporablja hidravlično upogibno silo valja na delovni valj valjarne, tako da ima delovni valj določen dodatni odklon, uresničitev spremembe krone delovnega valja za kompenzacijo sprememb v obliki valja delovnega valja med postopkom valjanja, kot je prikazano na sliki 2.

Hidravlični upogibni valji

2.2.2 Control measures

Med postopkom zvijanja aluminijaste folije za cigarete, the roughness and convexity process parameters of the rolling mill working rolls are the decisive factors affecting the quality of aluminum foil products. Through the study of the roughness and convexity process parameters of the rolling mill working rolls, it is determined that in the production process of aluminum foil for cigarettes, the roughness of the rolling rolls in the rough rolling stage is stably controlled at (0.2-0.3) μm, the roughness of the rolling rolls in the intermediate rolling stage is stably controlled at (0.20-0.25) μm, and the roughness of the rolling rolls in the finishing rolling stage is stably controlled at (0.03-0.05) μm, which greatly improves the stability of the rolling process of aluminum foil for cigarettes and improves the quality of aluminum foil for cigarettes. Ob istem času, in the rolling production process of aluminum foil for cigarettes, in addition to ensuring the uniformity of the roughness of the rolling mill working rolls and timely adapting to the convexity changes of the working rolls, the lubrication system should also be improved to reduce the friction coefficient, increase the back slip of the deformation zone, and reduce the rolling force.

2.3 Analysis of the impact of different plate shape control methods on plate shape and control measures

2.3.1 Analysis of the impact of plate shape control on plate shape

In the rolling production process of aluminum foil for cigarettes, the plate shape is a very critical technical indicator of the aluminum foil product itself, which determines the subsequent performance of the aluminum foil. There are three main ways to control the shape of aluminum foil products: ① hydraulic roll bending; ② hydraulic automatic thickness control system; ③ segmented cooling of rolling oil. The hydraulic roll bending and hydraulic automatic thickness control systems mainly make timely adjustments based on the characteristic changes during the rolling process of aluminum foil products, and the control effect is relatively average. The third control method uses segmented cooling of the rolling oil. Through the automatic detection system of the plate shape, the signal of the plate shape change is fed back in time to achieve closed control. For the rolling of wide-width aluminum foil products for cigarettes, this control method is more effective. z.

2.3.2 Control measures

In the general production process, according to the plate shape accuracy requirements of aluminum foil products for cigarettes, s sprejetjem celotnega sistema postopka mazanja, obliko plošče izdelkov iz aluminijaste folije je mogoče bolje nadzorovati. Ob istem času, sistem za pršenje robov lahko dobro prepreči tesnjenje robov med postopkom valjanja aluminijaste folije in odpravi problem požara v valjarni.

Poleg naštetega, in the rolling production process of aluminum foil for cigarettes, razumni procesni parametri redukcije so prav tako pomemben dejavnik pri zagotavljanju oblike plošče. Če je znesek zmanjšanja nastavljen prevelik, to bo povzročilo gubanje aluminijaste folije med zvijanjem, in celo vpliva na kotaljenje spodnjega vlečnega droga. V hujših primerih, valjani trak se bo zlomil, vpliva na učinkovitost proizvodnje in kakovost izdelkov. Če je nastavljeni znesek znižanja premajhen, stopnja obdelave prehodov se bo povečala in proizvodni stroški se bodo povečali. Zato, reasonable control of the reduction amount according to the rolling conditions of the product is crucial to product rolling production and product quality assurance.

2.4 Analysis and control measures of the impact of the original plate type of aluminum foil billet on subsequent medium and fine rolling

2.4.1 Analysis of the impact of the original plate type on subsequent medium and fine rolling

The supply of billets for the production of tobacco aluminum foil mainly includes two types: hot-rolled materials and cast-rolled materials. Regardless of the type of billet, the product quality of the incoming materials should be guaranteed, including the quality requirements of alloy composition, plate type, organization, uspešnost, površino, itd., to meet the subsequent rolling production of tobacco aluminum foil products. V dejanskem proizvodnem procesu, during the smelting process, the alloy composition is the first quality control factor. najprej, the chemical composition must meet the technical requirements. Drugič, the refining process should be adopted to strictly control the hydrogen content and non-metallic slag inclusions in the aluminum liquid. Na splošno, the hydrogen content is ≤0.12 ml/100Al, and the non-metallic slag inclusions above 5 μm are 0 to ensure the metallurgical quality, so as to meet the pinhole requirements of the subsequent finished tobacco aluminum foil. Ob istem času, the uniformity of the grain structure of the billet and the number of second-phase compounds should be guaranteed as much as possible to meet the performance requirements of subsequent products. For the incoming material shape of aluminum foil billets, because the shape is hereditary, if the incoming material shape is poor, the subsequent rolling shape will also be poor. Zato, nadzor vhodne oblike materiala je ključnega pomena za kasnejšo obliko zvijanja tobačne aluminijaste folije.

2.4.2 Control measures

Za gredice za proizvodnjo tobačne aluminijaste folije, v proizvodni povezavi livarstva in valjanja, zagotovljena mora biti konveksnost ter prečna in vzdolžna razlika v debelini lite in valjane plošče. Konveksnost je na splošno nadzorovana pri 0% do 1%, vzdolžna debelina je znotraj nadzorovana 0.05 mm/100 mm, in prečni naklon je nadzorovan znotraj 0.03 mm/100 mm. V proizvodni povezavi hladnega valjanja, je treba zagotoviti, da 98% trakov ima spletno ravnost ≤10I.

Application effects

Ta članek v glavnem analizira dejavnike, ki vplivajo na proces, in mehanizem aluminijaste folije za cigarete v vmesnem in končnem postopku valjanja, s poudarkom na vplivu naftnih derivatov, different work roll process parameters, different plate shape control methods, and the original quality of aluminum foil blanks on product quality. vpliv, control measures have been formulated. In the actual production of aluminum foil products for cigarettes, corresponding control measures have been adopted, with significant results. The quality of aluminum foil products for cigarettes has been greatly improved. The average product yield has reached 88%, which has improved production efficiency and reduced production costs.

Zaključek

• 1) According to the factors of rolling oil, the reasonable additive ratio is (7.0-8.0) mgKOH/g alcohol, 1.4 mgKOH/g acid, (5.5-6.5) mgKOH/g ester, and the online process parameters of the intermediate and finishing rolling oil are optimized to improve the surface quality of the product;
• 2) Glede na dejavnike procesnih parametrov različnih delovnih valjev, hrapavost vmesnega valjarnega valja je nadzorovana (0.20-0.25) μm, in hrapavost končnega valjarnega valja je nadzorovana (0.03-0.05) μm, tako da se izboljša stabilnost valjanja aluminijaste folije za cigarete;
• 3) Nadzorna metoda za zagotovitev oblike plošče izdelka in prvotne zahteve glede konveksnosti 0%-1% za surovec aluminijaste folije, tako da se zagotovi kasnejša kakovost zvijanja aluminijaste folije za cigarete.