Quality inspection of the hottest drink can produc

2022-08-10
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Quality inspection of beverage can production

as a kind of packaging, people put forward the highest requirements for the quality of cans: oxygen and air must not leak in, so as to ensure that the drinks in cans are not affected by the outside world. Compared with other beverage packaging materials, it has the highest compressive stability: although its wall thickness is only as thin as hair, it can withstand a pressure of up to 6bar. In the past year, the environmental protection performance of this kind of cans has been significantly improved: by reducing the recycling of metal materials, the same materials can produce three times more cans now than 30 years ago. Further weight reduction and optimization of production process also ensure the sustainable development of cans production

the weight of cans made of aluminum alloy is only 13g

Ball Packaging Europe (BPE) has tested the weight and safety performance of its metal packaging in its own technology center in Bourne. The task of the experts of Bourne technology center is to ensure the quality of cans in the further research and development of reducing the weight of cans and can covers (Figure 1). In the inspection of cans, different testing and analysis techniques simulating the real situation of cans are used. The standardized drop test tests the mechanical properties of cans by dropping them at different heights. The cans must not crack or break after falling. Depressions within the specified allowable size range are acceptable, because this is for the sake of pressure resistance safety of cans, and it is hoped that it can ensure safety through its own depression deformation. Therefore, the design and manufacture of the bottom and cover of the cans ensure that they will not burst due to the sudden increase of pressure in the cans

Figure 1 in the technical center of Ball Packaging Europe in Bourne,

the inspection test is being carried out on the pop can cover

the harm caused by defects

the ability of the anti-corrosion coating in the can to resist damage when the pop can is sunken is tested by the cart test method. During this test, the inspectors of the laboratory tested whether the porosity of materials in a new factory built by PolyOne in Pune, India in 2014 changed under the action of external mechanical forces. Similar to the drop test, the cart test also allows cans to fall from different heights. Use micro magnifying equipment to inspect the inside of the cans after the drop test to see if the internal coating changes after the drop. Even small cracks or changes in porosity should be avoided, because their defects will adversely affect the beverage in the can. Cans are produced by different deformation processes. During their production, their axial strength, that is, the stability of the center line of cans, was also tested within the framework of quality assurance. The unit of force during testing is n, the unit of pressure inside and outside the can is bar, and the unit of current intensity during internal coating integrity testing is ma

in order to get the test results that directly guide production, a canning production line for testing is set up in the technical center. Due to the small production batch of this manually controlled filling line, it cannot be compared with the filling line of beverage manufacturers, but its production conditions are almost the same: the canning capacity per hour is 120000 cans. The working parameters that affect the canning quality of cans are exactly the same as the actual production process: canning height and sealing accuracy (Figure 2)

Figure 2 the pop-up can plays a good role in protecting the drinks inside it,

ensures the reliability of long-term storage of beverages

has great potential to tap

experts in the technology center not only detect the quality of the pop-up can, but also develop the production and manufacturing technology of the pop-up can. The decisive technological improvement is often inseparable from the close cooperation of users. For example, they developed widget technology with Diageo, a beverage manufacturer, whose inflation rate is controlled at about 5% in Turkey, which is well-known in the world. With the help of capsules that produce a large amount of foam, the surface of beer poured out of cans can float foam for a long time. Diageo has rapidly expanded its beer market with this widget can. BPE company has also made further improvements to this technology on this basis. Today, it has been successfully used in dairy cans, such as the famous Italian coffee drink cappuccino. For a long time, the potential of cans has not been fully tapped. In particular, new electronic label technology and secondary sealing applications will win a broader market for cans in the next few years. The task of experts in BPE's technical center is consistent: to ensure quality and environmental performance of cans

production process of cans

● apply a layer of lubricating oil on the surface of white iron to ensure the smooth progress of stamping production process. In the stamping deformation process, the excess white iron is gradually cut out and gradually stamped into a disc shape

● the disc-shaped can blank is sent to the drawing machine. Under the action of the punch and pressing plate, the diameter of the disc-shaped blank gradually shrinks, keeping the thickness of the iron plate unchanged, and finally shrinks to the diameter of the punch. In order to avoid wrinkles on the pipe wall during drawing, the disc-shaped blank is pressed with a pressing plate. The gap between the drawing die and the drawing punch is just the size required for the wall thickness of the finished can. In this way, the disc-shaped blank with larger thickness is drawn into a barrel cylinder with thinner wall thickness. At the end of this process, the can bottom stamping die also stamping the shape of the bottom of the can. After the punch is returned, the demoulding device returns the can attached to the punch and outputs it to the outside of the drawing machine

● in the can cutting machine tool, the vacuum suction cup firmly absorbs the semi-finished can and drives it to rotate together; At the same time, it also moves along the axis direction until it reaches the height dimension required by the cans. The cutting tool for cutting the can feeds into the rotating can blank. When the can blank just rotates for one cycle, the upper and lower cutting tools will cut the can according to the required height

● then cleaning of cans, painting of external patterns, stamping, drying and painting of internal protective coatings

● in order to install the lid of the can with small diameter, the upper part of the cylindrical can should also be "reduced", that is, the diameter of the upper part of the can should be reduced through the calendering process. The cylindrical can is placed on the mandrel. When the mandrel moves axially, including filled and reinforced unfilled materials and hard thermoplastic plates, the upper part of the can is gradually compressed and reduced in the reducing die, and the diameter of the can mouth is reduced by about 1mm. After completing the diameter contraction, the mandrel retracts, and the cans are blown out of the mandrel by compressed air

● the subsequent crimping is the key to ensure the reliable combination of the can with beverage and the can cover. This process is completed on the crimping machine. Under the action of a plurality of curlers, the upper mouth of the can completes curling during the rotation of the can

● finally, the spray at the bottom of the cans. After a short month of intense preparation, the filter material company of Shanxi Aluminum Plant sprayed the paint and the second internal protective layer, as well as the final leakage test, curling crack test and internal defect inspection. (end)

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