Thermal Paper Properties and Functions

The video explains why older thermal printed bills fade over time, focusing on the thermal printing process. It covers the structure of thermal paper, which consists of substrate, base, and active layers, and the chemicals involved, such as color formers and developers. The video also describes how thermal printers work by applying heat to these layers, causing the text to appear. It highlights the issues of fading due to friction, UV exposure, and moisture, and offers a method to restore faded prints by gently heating the paper.

What is the main reason older bills become unreadable?

• The paper disintegrates.

• The ink fades over time.

• The bills are exposed to water.

• The thermal printing process causes it.

What are the three layers of thermal paper?

• Color, developer, and stabilizer

• Plastic, paper, and adhesive

• Ink, paper, and coating

• Substrate, base, and active layer

Which chemical is responsible for forming colors on thermal paper?

• Gelatin

• Alkali salts

• Color former

• Starch

What is the role of the color developer in thermal paper?

• To enhance the brightness of the dye

• To make the paper thicker

• To add fragrance to the paper

• To protect the paper from moisture

How do thermal printer heads function during printing?

• They cut the paper into shapes.

• They emboss the paper.

• They apply ink to the paper.

• They produce heat to form characters.

What happens when the heat reaches the active layer of thermal paper?

• The paper changes color.

• The text appears black.

• The paper becomes thicker.

• The paper becomes transparent.

Why does thermal printed text fade over time?

• The paper is exposed to high temperatures.

• The dyes revert to their crystalline form.

• The ink evaporates.

• The paper absorbs moisture.

What external factors contribute to the fading of thermal printed text?

• High humidity levels

• Contact with oil and grease

• Exposure to UV rays and moisture

• Direct sunlight exposure

How can faded thermal printed text be restored?

• By gently heating the paper

• By exposing the paper to sunlight

• By applying a chemical solution

• By soaking the paper in water

What happens when you heat the non-printed area of thermal paper?

• It becomes transparent.

• It blackens.

• It remains unchanged.

• It turns white.