Differenze tra le versioni di "Galalite/en"
(Creata pagina con "Galalith was used in the production of fountain pens by some companies around the '20s, when the research for materials that could replace the hard rubber began. In partic...") |
(Creata pagina con "However, galalith was not very successful and was quickly abandoned with the advent of celluloid. Its porosity in fact makes it strongly hygroscopic, with the tendency to...") |
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Galalith was used in the production of fountain pens by some companies around the '20s, when the research for materials that could replace the [[hard rubber]] began. In particular [[Sheaffer]] used it for some models produced for a very short time, which, because of the problems they had, were reused as pens for temporary replacement. [[Parker]] adopted galalith for the production of the fountain pens of the series called [[Ivorine]], even if the most extensive use was probably made by [[Conway Stewart]] for the production of some of his most original colored pens. | Galalith was used in the production of fountain pens by some companies around the '20s, when the research for materials that could replace the [[hard rubber]] began. In particular [[Sheaffer]] used it for some models produced for a very short time, which, because of the problems they had, were reused as pens for temporary replacement. [[Parker]] adopted galalith for the production of the fountain pens of the series called [[Ivorine]], even if the most extensive use was probably made by [[Conway Stewart]] for the production of some of his most original colored pens. | ||
| − | + | However, galalith was not very successful and was quickly abandoned with the advent of [[celluloid]]. Its porosity in fact makes it strongly hygroscopic, with the tendency to expand with humidity, which leads to problems of mechanical stability. Even worse, again for this characteristic, its resistance to ink, which tends to produce permanent stains. In addition, immersion in water (even for just a few hours) involves an expansion (up to 10%) and a softening of the material, with destructive consequences as a subsequent drying it will lose its original shape. Finally, with time the material tends to present cracks (usually they occur for long exposure to light and are believed to be caused by changes in moisture) that are only apparently superficial and can not be removed. | |
Per tutti questi motivi, con l'eccezione della [[Conway Stewart]] che ha continuato a produrre penne in questo materiale fino agli anni '30, alla metà degli anni '20 la galalite è stata totalmente abbandonata in favore della [[celluloide]], cosa che, unita alla fragilità del materiale che le rende di difficile conservazione, ha fatto sì che le penne costruite con esso, in particolare le [[Sheaffer]] e le [[Parker]], siano molto rare. | Per tutti questi motivi, con l'eccezione della [[Conway Stewart]] che ha continuato a produrre penne in questo materiale fino agli anni '30, alla metà degli anni '20 la galalite è stata totalmente abbandonata in favore della [[celluloide]], cosa che, unita alla fragilità del materiale che le rende di difficile conservazione, ha fatto sì che le penne costruite con esso, in particolare le [[Sheaffer]] e le [[Parker]], siano molto rare. | ||
Versione delle 23:59, 14 ott 2020
Galalith is a material invented in 1897[1] created from the formaldehyde treatment of casein (the milk protein), so much so that it is often simplistically called casein, although such an indication is not absolutely correct because hardened casein does not have the chemical and mechanical resistance characteristics of galalith, whose name derives from the union of the Greek words gala (milk) and lithos (stone).
The material is produced by a process in which casein is kneaded and colored and then processed to produce sheets, bars or slabs; these are then treated by immersion in a diluted solution of formaldehyde that causes, with a very slow reaction, the progressive hardening. Finally the material obtained is dried and then can be processed. The production process is therefore very slow (for thicknesses of 2.5 cm it may take up to one year of immersion), moreover, even if the galalite sheets can be hot bent, mould production is not possible, which makes the processing of the material more complex.
One of the most important characteristics of this material is instead the ease of coloring, which allows you to create endless variations and imitate different materials, so that it was also called artificial horn. The coloring in fact, in addition to the mixing of colors in the production phase, can be obtained, thanks to the high porosity of the material, in a second phase by immersing the galalith in coloring baths to obtain the absorption of pigments. The new material had a great diffusion in the production of buttons, where it is still used today, and for the substitution of ivory in the piano keys cover.
Galalith was used in the production of fountain pens by some companies around the '20s, when the research for materials that could replace the hard rubber began. In particular Sheaffer used it for some models produced for a very short time, which, because of the problems they had, were reused as pens for temporary replacement. Parker adopted galalith for the production of the fountain pens of the series called Ivorine, even if the most extensive use was probably made by Conway Stewart for the production of some of his most original colored pens.
However, galalith was not very successful and was quickly abandoned with the advent of celluloid. Its porosity in fact makes it strongly hygroscopic, with the tendency to expand with humidity, which leads to problems of mechanical stability. Even worse, again for this characteristic, its resistance to ink, which tends to produce permanent stains. In addition, immersion in water (even for just a few hours) involves an expansion (up to 10%) and a softening of the material, with destructive consequences as a subsequent drying it will lose its original shape. Finally, with time the material tends to present cracks (usually they occur for long exposure to light and are believed to be caused by changes in moisture) that are only apparently superficial and can not be removed.
Per tutti questi motivi, con l'eccezione della Conway Stewart che ha continuato a produrre penne in questo materiale fino agli anni '30, alla metà degli anni '20 la galalite è stata totalmente abbandonata in favore della celluloide, cosa che, unita alla fragilità del materiale che le rende di difficile conservazione, ha fatto sì che le penne costruite con esso, in particolare le Sheaffer e le Parker, siano molto rare.