Why do the words disappear after printing on thermal cash register paper?

Why Does the Print on Thermal Cash Register Paper Fade Over Time?

1. Chemical Reversibility:

• Explanation: Thermal paper contains a special chemical coating that changes color when exposed to heat. Over time, the chemical reaction that causes the color change can reverse itself, leading to the fading of the printed text or images.
• Factors: The rate of fading is influenced by exposure to heat, light, and humidity.

2. Environmental Factors:

• Heat: High temperatures accelerate the reversal of the chemical reaction, causing the print to fade more quickly.
• Light: Exposure to strong light, especially ultraviolet light, can break down the chemical components in the thermal paper, resulting in fading.
• Humidity: Excessive humidity can also affect the stability of the chemical coating, contributing to the fading of the print.

3. Material Quality:

• Composition: Different brands of thermal paper use varying chemical formulations. Higher-quality thermal paper tends to have better fade resistance and maintains its print longer.
• Coating Durability: The durability of the thermal coating affects the longevity of the print. Higher-quality coatings resist fading better.

4. Storage Conditions:

• Temperature and Humidity: Proper storage conditions, such as avoiding extreme temperatures and controlling humidity, can extend the life of the print.
• Light Exposure: Minimizing exposure to light, particularly direct sunlight, helps preserve the print quality.

Solutions to Prolong Print Life:

1. Choose High-Quality Thermal Paper:

• Brands: Opt for reputable brands known for their high-quality thermal paper.
• Specifications: Look for thermal paper with excellent fade resistance and durability.

1. Improve Storage Conditions:

• Temperature Control: Store thermal paper in a cool, dry environment.
• Humidity Control: Maintain moderate humidity levels to prevent moisture-related damage.
• Light Protection: Keep thermal paper away from direct sunlight and bright lights.

1. Regular Replacement:

• Frequency: Replace thermal paper rolls regularly to ensure the best print quality.
• Monitoring: Monitor the condition of the print and replace the paper when signs of fading appear.

1. Use Protective Covers:

• Clear Films: Apply transparent films or covers over printed receipts to protect them from environmental factors.
• Storage Bags: Store important receipts in protective bags or envelopes.

Summary:

The print on thermal cash register paper fades over time due to the reversible nature of the chemical reactions involved and environmental factors such as heat, light, and humidity. To prolong the life of the print, choose high-quality thermal paper, improve storage conditions, and regularly replace the paper.