CN104561672A - Aluminum foil material for food and production method thereof - Google Patents

Abstract

The invention relates to the production technology of an aluminum alloy material, in particular to an aluminum foil material for food and a production method thereof. The aluminum foil material for food comprises alloy composition in percentage by mass as follows: 0.45%-0.65% of Si, 0.95%-1.15% of Fe, 0.15%-0.20% of Cu, 0.08%-0.13% of Ti and the balance of Al. The alloy composition is optimized, design of cast-rolling parameters such as the size of a cast-rolling area and the like is controlled, so that ultra-thin cast-rolled plates can be produced, the cost is reduced greatly, defect-free cast-rolled slabs with uniform and small grains are obtained easily, and foundation is laid for production of top-grade food foil; further, by means of optimization of a heat treatment method, the food foil has stable performance and high elongation, the cost is reduced greatly through adoption of one-time annealing, and the production period is shortened.

Description

Food aluminum foil material and manufacture method thereof

Technical field

The present invention relates to the manufacturing technology of aluminum alloy materials, specifically a kind of food aluminum foil material and manufacture method thereof.

Background technology

Mainly using in the market 1 is alloy production food aluminium foil, and 1 is alloy because alloy content is low, and intensity is partially soft, causes rolling performance poor, causes production efficiency low.And traditional food aluminium foil production method, in order to improve the performance of food aluminium foil, improves product unit elongation, usually needs to increase annealing times, thus adds production energy consumption, extend the production cycle.

Summary of the invention

The present invention want technical solution problem to be provide a kind of performance requriements that can meet food aluminium foil, and the food aluminum foil material that manufacturing process is simple, cost is low, with short production cycle and manufacture method thereof.

Food aluminum foil material of the present invention is made up of following alloy ingredient and mass percent:

Si 0.45 ~ 0.65, Fe 0.95 ~ 1.15, Cu 0.15 ~ 0.20, Ti 0.08 ~ 0.13, Al surplus.

The manufacture method of food aluminum foil material of the present invention comprises the following steps successively:

1) melting, above-mentioned alloy ingredient proportioning, carries out melting to raw material;

2) casting, adopt little roll casting zone casting, roll casting zone controls at 15-20mm, makes cast-rolling stock gauge control 5.0 ~ 5.5mm;

3) cold rolling, be rolled down to 0.8mm thickness, turn slitting trimming operation;

4) slitting trimming;

5) paper tinsel rolls, the work in-process after slitting trimming through 6-7 passes to finished product thickness;

6) finished products, finished product annealing process is: furnace gas temperature is set in 350-360 DEG C, is incubated 12 ~ 15 hours, and furnace gas temperature heating gradient 4 ~ 6 DEG C/min.

The present invention, by optimized alloy composition, controls the design of the casting parameters such as roll casting zone size, can produce ultra-thin Casting Rolled Sheet, greatly reduce cost, and it is tiny easily to obtain uniform crystal particles, flawless cast-rolled block, lay a good foundation for producing luxury food paper tinsel; And by optimizing heat treating method, make the stable performance of food paper tinsel, unit elongation is high, once anneal owing to adopting, cost reduces greatly, also shortens the production cycle.

Embodiment

The present invention manufactures the embodiment of food aluminium foil through following steps:

1, melting

Melting must carry out proportioning according to the composition of lower list 1, carries out melting at a certain temperature, adopts induction stirring and rotate air blast to carry out online degasification, refining in fusion process.

Table 1 alloying constituent (%)

2, casting

When casting is produced, adopt Mitsui degasifying device, filtration adopts three-stage filtration, ensures that melt is pure, and without slag inclusion, alterant adopts aluminium titanium boron wire, and strict control alterant add-on.By little roll casting zone rolling casting technology, roll casting zone controls at 15-20mm, makes cast-rolling stock gauge control 5.0 ~ 5.5mm, and guarantees that surface is without defects such as black silk secret note, hole, slag inclusion, scratch, scuffings.The staggered floor that casting volume end face must not have impact to use, scarce aluminium, cold limit phenomenon; The casting volume produced must be placed on above pallet, does not allow to be placed directly on ground.

3, cold rolling

Must check work roll surface quality during cold rolling cogging, guarantee without defects such as scuffing and hard defects, clear deflector roll guide passage of wiping also checks whether each deflector roll rotates flexibly, avoids causing wiping scratching; During cogging, aluminium volume surface does not allow elongated or discontinuity scratch, scuffing, hard defects etc. to have the surface imperfection of feel; Surface purges must be clean, do not allowed residual greasy dirt; Turn slitting trimming operation when being rolled down to 0.8mm thickness, material must be rolled up urgent with 3 and above steel band before transhipment, avoid in transport process, expecting unwinding layer.

4, trimming

Slitting checks supplied materials surface and plate shape when carrying out trimming, and guarantees that this operation does not produce new defect, and monolateral trimming width, at 8-15mm, guarantees that end face is neat, without raw edges, burr, flange, staggered floor, turriform etc.

5, paper tinsel rolls

Work in-process after slitting trimming through 6-7 passes to finished product thickness, finished product must guarantee that plate shape is smooth, surface purges clean, is often rolled into product and must checks surface quality, guarantees that surface is without the defect such as bright line, aberration, black silk secret note, wiping scuffing, hole, slag inclusion.

6, finished products

Finished products checks supplied materials end face situation, whether the recirculating air hood checking stove is stained with aluminium foil, has, must clearly totally above aluminium foil can enter furnace annealing.Finished product annealing process is: furnace gas temperature is set in 360 DEG C, be incubated 14 hours, and furnace gas temperature heating gradient adopts 5 DEG C/min.

8, check and pack

Detect its mechanical property, tensile strength 80 ~ 95MPa, unit elongation is more than or equal to 5%.

Claims (2)

1. a food aluminum foil material, is made up of following alloy ingredient and mass percent:

Si 0.45 ~ 0.65, Fe 0.95 ~ 1.15, Cu 0.15 ~ 0.20, Ti 0.08 ~ 0.13, Al surplus.

2. a manufacture method for food aluminum foil material, comprises the following steps successively:

1) melting, above-mentioned alloy ingredient proportioning, carries out melting to raw material;

2) casting, adopt little roll casting zone casting, roll casting zone controls at 15-20mm, makes cast-rolling stock gauge control 5.0 ~ 5.5mm;

3) cold rolling, be rolled down to 0.8mm thickness, turn slitting trimming operation;

4) slitting trimming;

5) paper tinsel rolls, the work in-process after slitting trimming through 6-7 passes to finished product thickness;

6) finished products, finished product annealing process is: furnace gas temperature is set in 350-360 DEG C, is incubated 12 ~ 15 hours, and furnace gas temperature heating gradient 4 ~ 6 DEG C/min.