How to Test Food Paper for Oil and Moisture Resistance?
创建于04.22
To test food paper for oil and moisture resistance, use the following structured methods, ranging from simple practical tests to standardized procedures:
Oil Resistance Testing
1. Simple Oil Application Test
- Materials: Vegetable oil, dropper, timer, white tissue/paper.
- Procedure:
1. Place the food paper on white tissue.
2. Apply 2-3 drops of oil onto the paper.
3. Wait 15–30 minutes.
4. Check the tissue for oil stains. No stains indicate good resistance.
2. Kit Test (Standardized Method)
- Standard: TAPPI T 507 or ASTM D722.
- Materials: Kit test solutions (surface tension liquids numbered 1–12).
- Procedure:
1. Apply solutions (starting from lower numbers) to the paper.
2. Observe for penetration (darkening/translucency).
3. The highest number resisted determines the grease resistance rating.
3. Dye-Enhanced Oil Test
- Materials: Oil mixed with food dye.
- Procedure:
1. Apply dyed oil to the paper.
2. Monitor the reverse side for color transfer.
3. Faster penetration indicates lower resistance.
Moisture Resistance Testing
1. Water Drop Test
- Materials: Water, dropper, timer.
- Procedure:
1. Place a water droplet on the paper.
2. Observe absorption time. Beading indicates resistance; rapid absorption shows poor resistance.
2. Cobb Test (Standardized)
- Standard: ASTM D3285.
- Materials: Cobb tester, distilled water, scale.
- Procedure:
1. Secure paper in the Cobb ring.
2. Add water for 30 seconds (or specified time).
3. Measure weight gain post-test. Lower absorption = better resistance.
3. Contact Angle Measurement
- Tools: Contact angle goniometer.
- Procedure:
1. Place a water droplet on the paper.
2. Measure the angle formed. Larger angles (>90°) indicate higher hydrophobicity.
General Tips
- Controls: Compare with a known resistant paper.
- Environment: Conduct tests at standard temperature/humidity (e.g., 23°C, 50% RH).
- Quantitative Analysis: Weigh paper before/after exposure to measure absorption.
These methods balance simplicity for home/field use and precision for lab settings, ensuring thorough evaluation of oil and moisture resistance in food packaging paper.
Ray
Ferrill
Evelyn