What is the erasing principle of a erasable pen?

Erasable pen, also known as erasable pen or erasable pen, is a special writing tool whose writing content can be erased or modified in a specific way. Unlike traditional ballpoint pens and fountain pens, erasable ink has special chemical properties that allow writing marks to be erased or disappear under certain conditions. This type of pen is widely used by students, office workers, and situations where frequent modifications are required for writing content. This article will provide a detailed introduction to the erasing principle of erasable pens, helping readers better understand their working mechanism.
1. Special components of erasable pen ink
The ink for erasable pens is different from traditional ink, and its main components include the following:
-Thermal sensitive pigment: Erasable pen ink contains thermal sensitive pigment, which appears solid at room temperature and can adhere to the surface of paper to form visible writing marks. However, when the temperature rises to a certain level, the thermosensitive pigment undergoes a phase transition from solid to liquid, thereby losing its adhesion and the writing marks disappear.
-Resin and Plasticizer: Resin and plasticizer are key components in ink, which can regulate the viscosity and fluidity of ink, ensuring that ink can flow smoothly from the pen tip during writing while maintaining the stability of the writing trace. The presence of plasticizers also makes ink more prone to softening at high temperatures, making it easier to erase.
-Solvent: The solvent is used to dissolve other components in the ink, ensuring that the ink has appropriate fluidity. Common solvents include organic solvents such as ethanol and propanol, which evaporate quickly at room temperature and help ink dry quickly.
2. Principle of erasing
The erasing principle of erasable pens is mainly based on the thermal sensitivity of thermal sensitive pigments. Specifically, the erasing process can be divided into the following steps:
-Heating: When using erasers with erasers or specialized erasing tools, the heat generated by the friction between the tool and the surface of the paper is transferred to the writing marks. Due to the temperature sensitivity of thermal sensitive pigments, when the temperature rises to a certain level (usually between 60 ° C and 80 ° C), the pigment will transition from a solid state to a liquid state.
-Softening and detachment: As the temperature increases, the resin and plasticizer in the ink also soften, greatly reducing the adhesion between the writing marks and the surface of the paper. At this point, the writing marks become soft and easy to move, and the friction of the eraser can easily peel the ink off the surface of the paper.
-Clearing: Under the action of friction, the softened ink is carried away by the eraser, the surface of the paper is restored to a clean state, and the writing marks are completely removed. Due to the rapid evaporation of solvents in ink at room temperature, there will be no significant residue left on the surface of the erased paper.
3. Erasing tool
The erasable tool for erasable pens usually takes the following forms:
-Special eraser: Special erasers are usually made of soft materials that can generate sufficient frictional heat without causing damage to the surface of the paper. The shape and size design of the eraser are suitable for precise erasing, making it easy for users to modify the written content according to their needs.
-Friction head: Some erasable pen caps or tails are designed with friction heads, allowing users to directly use the friction head to rub back and forth on writing marks, using the heat generated by friction to erase ink.
-Hot air eraser: Some high-end erasable pens are equipped with a hot air eraser, which heats the writing marks to a softened state by blowing out hot air, and then gently wipes them with an eraser or tissue to remove them.
4. Precautions
Although the erasing function of the erasable pen is very convenient, the following points should still be noted during use:
-Temperature control: The temperature generated during erasing needs to be moderate, as being too high or too low can affect the erasing effect. Low temperature may cause ink to not soften completely and be difficult to completely remove; If the temperature is too high, it may damage the paper or cause ink residue.
-Paper selection: The erasable pen is suitable for most ordinary paper, but on some special paper (such as smooth copperplate paper), the erasing effect may not be ideal. It is recommended to conduct small-scale testing before use to ensure that the erasing effect meets expectations.
-Storage environment: Erasable pens should be stored in a cool and dry place, avoiding high temperatures or direct sunlight to prevent ink from softening or deteriorating prematurely.
5. Application scenarios
Due to its unique erasing function, erasable pens are widely used in the following scenarios:
-Learning and Education: Students can easily correct errors and improve learning efficiency by using erasable pens when doing homework or exams. Teachers can also use erasable pens to adjust comments and scores when grading homework.
-Office and record keeping: In meeting minutes, scheduling, and other occasions, erasable pens can be used to modify and update content at any time, keeping records clean and accurate.
-Artistic creation: Artists can easily modify and adjust lines using erasable pens when sketching or designing, increasing the freedom and flexibility of creation.
conclusion
The erasing principle of erasable pens is based on the thermal sensitivity of thermal sensitive pigments. By heating, the ink softens and detaches from the surface of the paper, thereby achieving the removal of writing marks. Its unique ink composition and erasing tool design make erasable pens widely applicable in learning and office settings. Understanding the erasing principle of erasable pens not only helps to better use this tool, but also improves the efficiency of writing and editing.
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