Question:
The process of coating of a plastic film with aluminium is called as :
The process of coating of a plastic film with aluminium is called as :
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Vapour deposition (metallization) improves the barrier properties of a plastic film without adding the weight, stiffness, and cost of a standard aluminum foil laminate.
Updated On: Jul 21, 2026
- Lamination
- Vapour deposition
- Extrusion coating
- Injection mouldings
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Flexible packaging films used for dairy products (like milk powder) require high barriers against oxygen, moisture, and light to prevent lipid oxidation.
This barrier is often created by depositing a very thin layer of metal onto a plastic film.
Step 2: Detailed Explanation:
The process of applying a microscopic layer of aluminum onto a plastic substrate (such as polyester or polypropylene film) is called Vapour deposition (also known as vacuum metallization).
In this process:
- The plastic film is fed through a high-vacuum chamber containing an evaporation source.
- Aluminum wire is heated to its boiling point under a high vacuum (around \(10^{-4}\text{ Torr}\)), causing it to vaporize.
- The vaporized aluminum condenses onto the cool surface of the moving plastic film, forming an extremely thin, uniform metallic layer (typically \(30\) to \(50\text{ nm}\) thick).
This metallized film has excellent barrier properties against light, moisture, and gases, while remaining flexible and cost-effective compared to thick aluminum foil laminates.
Lamination is the bonding of two pre-formed sheets, extrusion coating involves applying molten polymer, and injection molding is a shaping process for plastic parts.
Step 3: Final Answer:
The process of coating a plastic film with aluminum is called Vapour deposition.
Flexible packaging films used for dairy products (like milk powder) require high barriers against oxygen, moisture, and light to prevent lipid oxidation.
This barrier is often created by depositing a very thin layer of metal onto a plastic film.
Step 2: Detailed Explanation:
The process of applying a microscopic layer of aluminum onto a plastic substrate (such as polyester or polypropylene film) is called Vapour deposition (also known as vacuum metallization).
In this process:
- The plastic film is fed through a high-vacuum chamber containing an evaporation source.
- Aluminum wire is heated to its boiling point under a high vacuum (around \(10^{-4}\text{ Torr}\)), causing it to vaporize.
- The vaporized aluminum condenses onto the cool surface of the moving plastic film, forming an extremely thin, uniform metallic layer (typically \(30\) to \(50\text{ nm}\) thick).
This metallized film has excellent barrier properties against light, moisture, and gases, while remaining flexible and cost-effective compared to thick aluminum foil laminates.
Lamination is the bonding of two pre-formed sheets, extrusion coating involves applying molten polymer, and injection molding is a shaping process for plastic parts.
Step 3: Final Answer:
The process of coating a plastic film with aluminum is called Vapour deposition.
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