Paper bowls are typically made from more than one material; instead, they are composed of multiple materials to meet the requirements for water resistance, oil resistance, and load-bearing capacity when holding food (especially hot and cold drinks, soups, etc.). Common material compositions include:
Base Paper Layer
This forms the main structure of the paper bowl, providing shape support and strength. Food-grade paperboard, such as kraft paper or white cardboard, is typically used. Its thickness and hardness vary depending on the bowl's intended use (e.g., disposable fast food bowls, cold drink cups). The base paper layer must meet food contact standards to ensure safety and non-toxicity.
Coating or Lamination Layer
To prevent liquid leakage, the inner surface of paper bowls undergoes water- and oil-resistant treatment. Two common methods are as follows:
Polyethylene (PE) coating: This is the most widely used material. A thin layer of PE film is applied to the inner surface of the base paper layer via a lamination process. PE offers excellent water resistance and sealing properties, effectively blocking liquid penetration. It also withstands a certain range of temperatures (typically -20°C to 120°C), making it suitable for holding hot and cold drinks, porridge, soup, etc.
Other coatings: Some high-end paper bowls may use plant-based coatings (such as polylactic acid (PLA), a biodegradable material) or paraffin coatings (a traditional process, now less common due to poor heat resistance). However, PE coatings remain the mainstream.
Outer Printing Materials (Optional)
The outer surface of paper bowls is typically printed with patterns, text, etc. Food-grade inks are used to ensure the printed layer does not come into contact with food. These inks are safe and will not release harmful substances due to friction or temperature changes.
Additional Materials for Specialty Paper Bowls
High-temperature-resistant paper bowls: For example, bowls used for hot soup or instant noodles may use thicker cardboard and a heat-resistant PE coating (or a composite multi-layer structure) to enhance thermal insulation and stability.
Degradable paper bowls: In addition to the base paper layer, they may use a biodegradable PLA coating or other bio-based materials, making them easier to decompose in the natural environment and reducing pollution.
Zhejiang Xinxinli Machinery Co., Ltd
Tel: +86-577-65577123
Fax: +86-577-65577123
Mob: +8618657789284
Email: monica@aeast.com
Add: No.9, Yuandong Road, Feiyun Street, Ruian City, Zhejiang Province, China
