Question 1

If a plastic bottle is recycled, its cap is automatically recycled.

Accepted Answer

Detachable caps frequently separate from bottles and escape the formal waste stream, acting as independent pollutants, which has led to global demands for 'tethered caps'.

Question 2

Bottle caps and bottles are made of the exact same type of plastic.

Accepted Answer

Bottles are typically made of PET (Polyethylene Terephthalate), while caps are made of HDPE (High-Density Polyethylene) or PP (Polypropylene).

Question 3

Consider the following statements regarding Plastic Waste Management in India and bottle caps: 1. Under India's EPR guidelines (2022), plastic caps and closures are classified as Category III (Multilayered plastic). 2. Tethered caps are designed to remain attached to the container to ensure they are collected and sent to recycling facilities together with the bottle. 3. PET bottles and their caps are generally manufactured from the exact same polymer to facilitate single-stream melting. How many of the above statements are correct?

Accepted Answer

(a) Only one — Statement 1 is incorrect: Caps are rigid plastics, falling under Category II (Rigid plastic packaging), while PET bottles fall under Category I. Statement 2 is correct: Tethered caps stay attached to prevent littering and ensure co-collection. Statement 3 is incorrect: Bottles are usually PET, while caps are HDPE or PP. They cannot be melted together and require separation at the recycling plant.

Question 4

Match the Plastic Category under India's EPR Guidelines (2022) with its description: List I (Category): A. Category I, B. Category II, C. Category III, D. Category IV. List II (Description): 1. Rigid plastic packaging, 2. Multilayered plastic packaging, 3. Rigid as well as flexible plastic packaging, 4. Plastic sheet or like used for packaging made of compostable plastics.

Accepted Answer

(a) A-3, B-1, C-2, D-4 — According to the EPR Guidelines 2022: Category I is Rigid and flexible plastic packaging. Category II is Rigid plastic packaging. Category III is Multilayered plastic packaging. Category IV is plastic sheet or like used for packaging made of compostable plastics.

Question 5

Assertion (A): The adoption of tethered caps can complicate the final processing stage at plastic recycling facilities. Reason (R): PET bottles and tethered HDPE/PP caps have different melting points and densities, requiring separation before final extrusion.

Accepted Answer

(a) Both A and R are true and R is the correct explanation of A. — Tethered caps ensure the cap reaches the recycler (solving the collection problem). However, because the cap (HDPE/PP) and bottle (PET) are different polymers, they cannot be melted together without degrading the recycled plastic quality. Recyclers must shred the attached unit and use a 'sink-float' tank where PET sinks and HDPE/PP floats to separate them. Thus, keeping them physically attached initially requires mechanical separation later.

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