The role of the pen and the type of pen
The role of the pen: The pen is a tool for writing, which can be used to learn cultural science knowledge, exchange information, publicize ideas, contact feelings, and so on. The pen is an indispensable cultural item in life.
Types of pens: pencils, gel pens, ball pens, water-based pens, projection pens, milk pens.
Pencil: At that time, the shepherds in Barodale used graphite to mark the sheep. Inspired by this, people cut the graphite block into strips for writing and painting. Soon, King George II simply took the Barodale Graphite Mine as a royal family and made it a royal patent. Writing it with a graphite strip will both stain your hands and break easily. In 1761, the German chemist Faber first solved this problem. He rinses the graphite with water, turns the graphite into graphite powder, then mixes it with sulfur, sputum, and rosin, and then mixes the mixture into strips, which is much more tough than pure graphite strips and does not easily stain the hands. This is the earliest pencil.
Gel pen: The gel pen contains an organic solvent, which is lower in viscosity than oily pen ink and thicker than water-based pen. When writing, the ink passes through the pen tip and turns from semi-solid to liquid ink. The gel ink is the largest. The advantage is that each drop of ink is used on the tip of the pen, and it does not volatilize or leak water, so it can provide a silky smooth writing feel, and the ink flow is smooth and stable.
Ball pen: The pen can be divided into oily and neutral: the characteristics of oily pen ink are high ink viscosity and strong water, but more oil stains; neutral pen ink has moderate ink viscosity, less oil stain, fluent writing, water resistance and light resistance. Sex is better than oily pen ink.
Water-based pen: The main solvent of water-based pen is water. Common water-based pens include steel ball pen, signature pen, plastic, brush and highlighter. Water-based pen is less odorous than oily pen. The tip of the pen is not easy to dry. Its handwriting is light-resistant but not water-resistant. Will be rendered, it is easy to break the water if you accidentally fall.
Projection pen: The projection pen is basically an oil-based pen. It has a wide range of applications. It can be written on a transparencies, glass or any object. It does not fade or fall off. Many academic institutions or research institutes like to buy a projection pen because it can be used in Make a mark on the beaker or test tube. Some brands of projector pens can replenish ink. It takes half an hour to refill the ink for the first time, and only ten minutes after the second time, which is quite convenient. There are also manufacturers that provide water-based projection pens, which can be wiped with water after application, leaving no traces, suitable for presentations where calculations or demonstration exercises are required on site.
Milk pen: The milk pen was first developed by PENTEL in Japan. The ink contained in it is not real milk, but neutral ink, but it was named "MILKY" when it was launched in Japan, and used a cow as an advertising film. The expression method; plus the seven colors of this product are all pastel colors, giving a soft feeling, generally used to call it "milk pen"! The milk pen can be written on black or dark letter paper, or it can be applied to nails. It is very special in use and is popular among girls in Japan.