Paper Plate Food Greaseproof Paper Coating: Comprehensive Technical Overview

1. Definition and Composition

Paper Plate Food Greaseproof Paper coating refers to specialized barrier coatings applied to paper substrates to create oil- and grease-resistant food service products. These coatings typically consist of fluorochemicals, silicone polymers, or bio-based alternatives like PLA (polylactic acid) and starch derivatives. The most common fluoropolymer used is perfluorooctanoic acid (PFOA)-free PFAS with a molecular weight range of 500-1000 g/mol, providing optimal surface energy reduction to 10-15 dynes/cm.

2. Key Technical Characteristics

2.1 Barrier Performance

The coatings demonstrate exceptional resistance to:

• Grease penetration: >24 hours at 40°C (ASTM F119-82)

• Oil holdout: >180 minutes for castor oil (TAPPI T454)

• Water vapor transmission rate (WVTR): 5-15 g/m²/day at 38°C/90% RH

2.2 Thermal Properties

Modern coatings withstand:

• Continuous use temperatures up to 120°C

• Short-term exposure to 200°C for 30 seconds

• Glass transition temperatures (Tg) between 45-75°C (DSC analysis)

2.3 Mechanical Properties

• Tensile strength: 35-50 MPa (MD direction)

• Elongation at break: 4-8%

• Bending stiffness: 3-7 mN·m (ISO 2493)

2.4 Safety Compliance

All food-contact coatings meet:

• FDA 21 CFR 176.170/180

• EU Regulation 10/2011 (migration limits < 0.01 mg/kg)

• Swiss Ordinance SR 817.023.21

3. Application Scenarios

3.1 Food Service Industry

• Fast food packaging: For burgers (grease resistance >8 Kit Number), fried chicken, and pizza boxes

• Microwave-safe containers: Withstanding 800W for 3 minutes without delamination

• Hot beverage cups: Preventing leakage at 95°C for 1 hour

3.2 Retail Packaging

• Bakery products with 15-20% fat content

• Prepared meal trays for refrigerated storage (4°C)

• Frozen food packaging at -18°C

3.3 Institutional Use

• Hospital meal trays (sterilizable at 121°C for 20 minutes)

• School lunch programs meeting CPSIA lead content requirements

• Airline catering with altitude pressure resistance up to 0.7 bar

4. Maintenance and Care Guidelines

4.1 Storage Conditions

• Maintain relative humidity at 45-55% RH

• Store at temperatures < 30°C

• Prevent UV exposure (max 50 lux)

4.2 Usage Precautions

• Maximum microwave duration: 2 minutes at 900W

• Avoid contact with sharp objects (scratch resistance 3H pencil hardness)

• Not suitable for conventional ovens > 150°C

4.3 Cleaning Procedures

• For reusable variants: Hand wash with pH 6-8 detergents

• Drying temperature < 60°C

• Maximum reuse cycles: 5-7 times (depending on coating type)

4.4 Disposal Considerations

• Industrial composting: Degrades 90% in 12 weeks (ASTM D6400)

• Recycling compatibility: Must meet EN 13430 standards

• Incineration energy value: 18-22 MJ/kg