Why are disposable paper bowls waterproof? | KaiLai Packaging
Disposable paper bowls typically feature a coating to achieve waterproofing, oil resistance, and enhanced strength. Common coating materials include:1. Polyethylene (PE) Coating: Widely used for its excellent waterproof and oil-resistant properties, preventing liquids from penetrating the paper.2. Polylactic Acid (PLA) Coating: A biodegradable option that offers similar benefits to PE while being more environmentally friendly as it degrades under appropriate conditions.3. Wax Coating: A traditional method effective for waterproofing, though less common today due to its environmental impact and heat resistance limitations.4. Water-Based Polymer Coating: A newer, eco-friendly material providing waterproof and oil-resistant properties.These coatings ensure that disposable paper bowls maintain their structure and prevent softening or leakage when in contact with liquids, making them practical and safe for holding food and beverages.