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Title : Video reveals the hidden clear plastic film INSIDE aluminium cans when the metal reacts with acid
link : Video reveals the hidden clear plastic film INSIDE aluminium cans when the metal reacts with acid

Video reveals the hidden clear plastic film INSIDE aluminium cans when the metal reacts with acid

How cans have a hidden PLASTIC linings: 'Secret' clear film inside most drinks tins is revealed by burning off the aluminium around it

• There is a secret film of plastic that lines the interior of most aluminium cans 
• It's used to block a chemical reaction between aluminium and acid in the drink 
• The acid reacts with the aluminium creates aluminium phosphate and hydrogen  
• Excess levels of aluminium has been associated with bone and brain disorders 

By Yuan Ren For Mailonline

Published: 18:16 BST, 23 May 2019 | Updated: 08:04 BST, 24 May 2019

There's more to a coke can than meets the eye, a whole inner tube of plastic in fact. 

A shocking video from MEL Science has revealed the secret plastic coating inside aluminium cans after the metal is dissolved away with detergent.

The film is there to act as a barrier against the corrosive effect of acidic drinks on the reactive metal.

High levels of anything that has reacted with aluminium is a potential threat for bone and brain function in humans and this prevents it getting inside people.

Experts told MailOnline that the film is 'negligible' and makes up a tiny percentage of the can and is destroyed before the metal is recycled. 

  
Fizzy drinks are filled with carbon dioxide gas, which is what gives them their bubbles.

The carbon dioxide gas dissolves in liquids forms an acid, which gives carbonated drinks like Coca Cola a high levels of acidity. 

The acid responsible is normally phosphoric acid in coke and citric acid in juice based drinks like Fanta. 

If this acid was in direct contact with the metal aluminium it would react with the metal and corrode it, creating an aluminium compound known as aluminium phosphate as well as hydrogen gas.

High levels of aluminium in the body can be toxic and excess levels can cause bone and brain abnormalities. 

The plastic liner forms a barrier between the product and metal, providing protection against food-borne diseases.  

According to Aluminium Association's website, the plastic coatings in coke cans forms a barrier between the product and metal. 

'These coatings have been critical to improving food and beverage safety since being introduced more than 50 years ago,' it wrote.   

These films have also been 'critical' to improving food and beverage safety since their introduction 50 years ago.   

Matt Meehan, from The Aluminum Association, told MailOnline what happens to the plastic during the recycling of metal cans. 

He said: 'First the cans are shredded before going into a heating kiln.

'The non-metal components of the can are first burned off at a high temperature to EPA-(Environmental Protection Agency) approved emission levels. 

'And the remaining gases are directed through a particulate control system to remove any residual solids.'

A shocking video has revealed the secret plastic coating in a coke can after the aluminium metal is dissolved away with detergent. The plastic film is there to act as a barrier against corrosive effect of acidic coca cola on the aluminium which is a very reactive metal

WHAT IS ALUMINIUM AND HOW IS IT RECYCLED? 

Aluminium is the most abundant metal in the earth's crust and it is widely distributed. 

Aluminium is a very reactive element and is never found as the free metal in nature. 

It is found combined with other elements, most commonly with oxygen, silicon, and fluorine. 

These chemical compounds are commonly found in soil, minerals (e.g., sapphires, rubies, turquoise), rocks (especially igneous rocks), and clays. 

Aluminium as the metal is obtained from aluminium-containing minerals, primarily bauxite. 

Aluminium metal is light in weight and silvery-white in appearance. 

It is used to make a host of food-based materials - including cans. 

They can be separated from steel cans by a magnet and are then entered into a recycling process that strips it of any impurities. 

The plastic sleeve inside cans, which prevents any unwanted reaction, is incinerated and paint stripped away. 

It then goes through a re-melt process and turns into molten aluminium, this removes the coatings and inks that may be present on the aluminium.

The aluminium is then made into large blocks called ingots. Each ingot contains about 1.6 million drinks cans.

The ingots are sent to mills where they are rolled out, this gives the aluminium greater flexibility and strength.

This is then made into aluminium products such as cans, chocolate wrapping and ready meal packaging.

In as little as 6 weeks, the recycled aluminium products are then sent back to the shops ready to be used again. 

Mr Meehan also added that the plastic element does not make up a significant portion of the packaging.

'We don’t have specifics on the precise weight of the coating liner (and it likely varies from product to product) but I can say it is a negligible amount of the weight of the total can.'

Overall, cans are much better for the environment than plastics, said Mr Meehan, as they have a higher rate of recycling than glass or plastic and can be repeatedly recycled in a closed loop process that takes only about 60 days. 

Aluminium is the most abundant metal in the earth's crust and it is widely distributed.

It is a very reactive element and is never found as the free metal in nature but Instead found combined with other elements, most commonly with oxygen as an oxide.

These chemical compounds are commonly found in nature such as in soils and rocks.  

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