Dans notre vie quotidienne, Nous voyons beaucoup de canettes, comme les canettes de bière, canettes de boisson, boîtes de conserve, etc., Alors, de quels matériaux ces canettes sont-elles faites? Quelles sont leurs différences?
Il y a deux types de matériaux de pot que nous avons vus:
3104 Bobine d’aluminium H18 pour canettes
Les types d’alliages généralement utilisés dans la production de canettes en aluminium sont 3104 alliage, 3105 alliage, 5052 alliage, 5182 alliage, etc.;
Les boîtes métalliques sont divisées en boîtes de deux pièces et boîtes de trois pièces en fonction de leur structure;
La boîte en trois pièces est composée de trois parties: Le corps de la boîte, le fond de la boîte et le couvercle de la boîte;
Boîtes en fer blanc (trois pièces)
La boîte en deux parties est composée de deux parties: Le couvercle de la boîte et le corps de la boîte sans couture intégré avec le fond, et le corps de la boîte et le couvercle de la boîte sont serties;
Boîtes en aluminium (deux pièces)
Lorsque l’aluminium est utilisé comme matériau, Il est principalement transformé en boîtes de conserve en deux pièces, et lorsque le fer-blanc est utilisé comme matériau, Il est principalement transformé en boîtes de trois pièces. La différence entre les deux est principalement le processus de fabrication du corps de la boîte.
3104/3105/5052/5182 représentent différentes qualités d’alliage d’aluminium. 3104, 3105, 5052, et 5182 sont quatre matériaux courants pour la fabrication de boîtes de conserve. Ils ont quelques différences dans la composition chimique et les propriétés physiques, mais ils peuvent répondre aux différentes exigences des clients;
3104 Bobine d’aluminium H18
|Alliage||Et||Fe||Cu||Mn||mg||Cr||Zn||De||Les autres||Al: Min.|
|Tolérance d’épaisseur||±0,005 mm|
|Application||3104/3105 H18/H19 pour corps de boîtes,3104/5052/5182 H48 pour couvercle de boîtes de conserve|
|1.Réduction de l’écart
The cutting-edge approach for making aluminum beverage cans is called two-piece drawing and wall ironing. The technique starts with an aluminum ingot which changed into cast to be approximately 30 pouces (seventy six cm) épais, then rolled into a skinny sheet. The first step inside the actual manufacture of the can is to cut the sheet into a circle, known as a clean, in order to form the lowest and sides of the can. Each blank is five.Five inches (14 cm) in diameter. Some material is always The small ripples on the pinnacle of the metallic are called “ears”. “Earing” is an unavoidable effect of the crystalline structure of the aluminum sheet.
The small ripples on the pinnacle of the metallic are known as “ears”. “Earing” is an unavoidable impact of the crystalline structure of the aluminum sheet.
Lost between every circle, but manufacturers have discovered that minimum aluminum is lost whilst the sheets are huge enough to maintain two staggered rows of 7 blanks each. À propos de 12-14% of the sheet is wasted, but may be reused as scrap. After the round clean is cut, it’s miles “drawn” or pulled up to form a cup three.Five inches (8.Nine cm) in diameter.
|2.Redrawing the cup
The small cup as a result of the initial draw is then transferred to a 2nd device. A sleeve holds the cup exactly in location, and a punch diminished rapidly into the cup redraws it to a diameter of approximately 2.6 pouces (6.6 cm). The peak of the cup will increase simultaneously from the preliminary 1.3 to two.25 inches (three.Three to 5.7 cm). The punch then pushes the cup in opposition to three jewelry called ironing jewelry, which stretch and skinny the cup walls. This whole operation—the drawing and ironing—is done in a single non-stop punch stroke, which takes handiest one fifth of a 2d to complete. The cup is now about 5 pouces (13 cm) excessive. Then any other punch presses up in opposition to the base of the cup, causing the lowest to bulge inward. This form counteracts the pressure of the carbonated liquid the can will incorporate. The bottom and lower walls of the can also are a bit thicker than the top partitions, for added power.
|3.Trimming the ears
The drawing and ironing process leaves the can slightly wavy on the pinnacle. These small ripples inside the metallic are known as “ears.” “Earing” is an unavoidable impact of the crystalline shape of the aluminum sheet. Aluminum agencies have studied this phenomenon drastically, and they had been capable to steer the position and peak of the ears with the aid of controlling the rolling of the aluminum sheet. Despite the fact that, some material is lost at this stage. Approximately a quarter inch is trimmed from the top of the can, leaving the higher walls immediately and stage.
|4.Cleaning and decorating
The drawing and ironing process leaves the outer wall of the can with a clean, shiny surface, so it does no longer require any in addition finishing inclusive of polishing. After the ears are trimmed, the can is cleaned and then imprinted with its label. After the can is adorned, it’s far squeezed in barely at the top to a make a neck, and the neck is given an out-ward flange at the very pinnacle facet, on the way to be folded over once the lid is introduced.
The lid is made of a slightly exceptional alloy than the aluminum for the bottom and facets of the can. The inward bulge of the bottom of the can facilitates it withstand the pressure exerted by the liquid inner it, however the flat lid have to be stiffer and more potent than the base, so it is fabricated from aluminum with extra magnesium and less manganese than the rest of the can. This effects in more potent steel, and the lid is significantly thicker than the walls. The lid is cut to a diameter of 2.1 pouces (5.Three cm), smaller than the two.6-inch (6.6 cm) diameter of the partitions. The middle of the lid is stretched upward barely and drawn through a system to shape a rivet. The pull tab, a separate piece of metallic, is inserted underneath the rivet and secured by way of it. Then the lid is scored so that when the tab is pulled by using the purchaser, the metal will detach without problems and depart the right beginning.
To make certain that the cans are made nicely, they’re routinely checked for cracks and pinholes. One in 50,000 cans is typically found to be faulty.
|6.Filling and seaming
After the neck is formed, the can is prepared to be crammed. The can is held tightly against the seat of a filling system and a beverage is poured in. The lid is added. The top flange fashioned whilst the can become given its neck is then bent around the lid and seamed shut. At this point, the can is ready on the market.
Épaisseur: The aluminum alloy 5052 bobine d’aluminium used for the can lid is flat, and the thickness control is more precise, and the thickness tolerance of ±0.005mm can be guaranteed to ensure the stability of the later processing.
Flatness: the strip does not allow obvious waves, the wave height within 1 meter does not exceed 3mm, and the wave does not exceed 3/m;
Side curvature: the side curvature of the product on any 2000mm length should not be greater than 0.5mm;
Terminal warpage: any product with a length of 1500mm is cut, and the height of the terminal warpage is ≤5mm;
Les articulations: No joints are allowed.
Surface: Severe air bubbles, paint leaks, Rayures, corrosion, oil spots, peeling, streaks, color differences, mottled spots, roll marks, periodicity, etc. are not allowed to affect the appearance quality of the product, and the burrs are <=0.04mm;
End face: the end face is neat, tight without loose layer, staggered layer ≤ 2mm, tower shape ≤ 5mm;
In 1940, Europe and the United States began to sell beer in stainless steel cans. En même temps, the appearance of aluminum cans also became a leap in canning technology. In 1963, the can was invented in the United States. It inherited the shape and design characteristics of the previous cans, and a pop-top was designed on the top.
This is a revolution in the way of opening, which has brought great convenience and enjoyment to people, so it will be widely used soon. By 1980, the European and American markets basically adopted this aluminum can as the packaging form of beer and carbonated drinks. With the advancement of design and production technology, aluminum cans tend to be lightweight, from the initial 60 grams to about 21 à 15 grams in 1970.
Manufacturing techniques for aluminum soda cans have continued to improve over the decades. The weight of aluminum cans has been greatly reduced. In the early 1960s, the weight of every thousand aluminum cans (including cans and lids) reached 55 Livres (about 25 kilograms), and in the mid-1970s it dropped to 44.8 Livres (25 kilograms). kilogram), which was reduced to 33 Livres (15 kilograms) in the late 1990s, and has now been reduced to less than 30 Livres, which is nearly half that of 40 years ago.
aluminum cans history
Dans le 20 years from 1975 à 1995, the number of aluminum cans (capacity 12 Onces) made of 1 pound of aluminum increased by 35%. According to the statistics of the American ALCOA company, the aluminum required for every thousand aluminum cans decreased from 25.8 pounds in 1988 à 22.5 pounds in 1998 et 22.3 pounds in 2000.
American can manufacturers have continuously made breakthroughs in sealing machinery and other technologies, so the thickness of aluminum cans in the United States has dropped significantly, De 0.343 mm in 1984 à 0.285 mm in 1992 et 0.259 mm in 1998.
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