PE coating is used primarily to make paper products liquid-proof and durable, transforming them from simple paper into functional packaging. Here's a breakdown of its key functions:

• Preservation and Food Safety:
  • Contamination Barrier: The coating protects the paper from direct contact with the liquid, preventing the paper from contaminating the beverage and vice-versa. It also acts as a barrier against external contaminants.
  • PE is Food-Safe: It is a FDA-approved material for food contact, meaning it is non-toxic and does not impart any taste or odor to the food or drink.
• Flexibility and Durability:
  • The PE layer adds significant strength and toughness to the paper substrate. It makes the cup more resistant to crushing when gripped and provides flexibility that prevents the paper from cracking during the cup-forming process or when handled by the user.
• Cost-Effectiveness:
  • Compared to other plastic polymers and barrier materials, PE is relatively inexpensive. It provides the essential barrier properties at a low cost, which is vital for high-volume, disposable products like paper cups.