Overview
Coated base paper is a composite material where a base paper sheet is laminated with a polymer film, typically polyethylene (PE), to improve functional properties. The coating process involves extrusion lamination or solvent-based methods, creating a barrier against moisture, oils, and external contaminants. This material bridges the gap between traditional paper and plastic films, offering eco-friendly advantages (e.g., recyclability) while maintaining performance. It is a staple in industries requiring durable yet printable packaging solutions.
Physical and Chemical Properties
The physical properties of coated base paper depend on the base paper's grammage (GSM) and the polymer coating thickness. Common GSM ranges from 60 to 350 GSM, with coatings adding 10–30 microns. The material exhibits high tensile strength and puncture resistance. Chemically, PE-coated variants resist water, acids, and alkalis, making them suitable for liquid packaging. Advanced coatings like PLA (polylactic acid) offer biodegradability but may compromise barrier properties. UV resistance varies by polymer type.
Main Applications
Food packaging dominates the market, especially for fast food wrappers, coffee cups, and frozen food boxes. The coating prevents grease and moisture penetration while enabling high-quality printing for branding. In non-food sectors, coated base paper is used for pharmaceutical blister packs, adhesive labels, and industrial protective wraps. Its compatibility with die-cutting and embossing machines adds versatility for custom designs.
Safety and Storage
Food-grade coatings must comply with FDA (USA) or EU 10/2011 regulations, ensuring no migration of harmful substances. Storage requires avoiding humidity above 65% RH to prevent paper curl or mold growth. Flammability is a concern; PE coatings emit toxic fumes when burned. Recycling requires separation from non-coated paper streams. Suppliers often provide Material Safety Data Sheets (MSDS) for industrial handling guidelines.
B2B Procurement Guide
Buyers should specify: (1) Coating material (LDPE, PP, or PLA), (2) GSM and coating thickness, (3) Roll/sheet dimensions, and (4) Certifications (e.g., ISO 9001, FSC). Bulk orders (≥1 ton) typically reduce costs by 15–30%. For sustainable options, biodegradable PLA coatings cost 20–40% more than PE. Lead times vary from 2–6 weeks; Chinese manufacturers dominate supply, but European producers offer higher regulatory compliance.
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