Pens are items that are very familiar to most people in the world. However, in the world, there are only 4 countries that can produce iron balls at the tip of the pen, so that the ink flows evenly according to each stroke of the pen.
Difficulty in producing pen located on small marbles with sizes from 0.5 to 1mm. These details require a high level of metallurgical technology. In the past, people used stainless steel, copper and some other alloys.
However, only Tungsten-carbide is good enough for long-term use. Tungsten carbide is also known by another name as Tungsten carbide – a chemical compound containing tungsten and carbon atoms, the chemical formula is WC. Tungsten-carbide has twice the hardness of steel.
The small ball of the pen tip is a high-level metallurgical product. Source: Tsubaki-nakashima.com
Until now, there are only 4 countries in the world Switzerland, Germany, Japan and China can master this marble production technology. Thus, even the big countries like USA, France, Russia, UK… have not been able to make complete ballpoint pens on their own.
Chinese stationery manufacturers took five years to conduct intensive research on the material, and it wasn’t until 2017 that the country succeeded in producing its own complete ballpoint pen.
How are pens made? Viet Sub: Hao Nguyen – Thanh Luan
at Blogtuan.info – Source: Soha.vn – Read the original article here