Unusual Ballpoints
Two of the more interesting developments in the world of ballpoint pens includespace pensanderasable pens .
Space Pens
Space Pens , orpressurized pens , are a technical freshness . Take , for exercise , the Fisher Space Pen . A blank space pen ’s ink reservoir is pressurized ( ~40 lb / sq . in . ) , and the ink is a specialviscoelasticink ( like thick pencil eraser cement ) . The Biro must rotate in guild for the thick ink to liquefy , allowing it to write smoothly and dependably on most surfaces , even under water . average ballpoint playpen rely on gravity to feed the ink and have an first step in the top of the ink cartridge to allow air to replace the ink as it is used . There is no hole in space pens , eliminating evaporated or languish ink as well as leakage from the buttocks of the ink man-made lake . In addition , a infinite pen can last up to 100 year , compared with the average two - year ledge life history of a received ballpoint pen .
Since the sixties , when the " Space Race " begin , space pens have been used by the U.S. astronauts on all manned space flights , including lunar trips , and were also used by many of the Russian cosmonauts on the Soyuz infinite flights and the MIRspace station .
Erasable Pens
Erasable pens were tremendously popular when they were introduced in the early 1980s . They fuse the readability of bright colored or mordant ink with the eraser functionality of a pencil . While the pens are still manufactured under names like Gillette Eraser Mate , they are n’t as commonly used as they were before . PatentsUS2966418andUS4097290 , among others , delineate these pen in detail .
What do erasable ballpoint pen so different from traditional ballpoint pens is the " ink " – instead of being made from oils and dye , it is made of aliquid safety cementum . As you write , the ballpen wrap on the newspaper and dispenses the rubber cementum ink ( the leave home run is know as atrace ) . Modern erasable pens act upon by allowing a ballpen penitentiary to go out a definite and intense inkiness or colored trace which looks like an ink suggestion , but is able of being easy erased shortly after writing ( ordinarily up to 10 hours ) . After that time , the hint will indurate and become non - erasable .
Erasable ink more often than not consist of 15 pct to 45 percent ( by weight ) natural condom that is fade away in a serial of volatile organic solvents with varying simmering points .
For more data , check out the links below .
