CH140042A

CH140042A - Process for treating glass from the point of view of its properties of transparency towards ultraviolet rays.

Info

Publication number: CH140042A
Authority: CH
Inventors: Works Corning Glass
Original assignee: Works Corning Glass
Priority date: 1927-10-15
Filing date: 1928-10-15
Publication date: 1930-05-31
Also published as: CH142393A

Description

  

  Procédé pour traiter le verre au point de vue de ses propriétés de transparence  - envers les rayons ultraviolets.    On a     constaté    que les verres susceptibles  d'être traversés par les rayons ultraviolets,  en     particulier    par ceux de ces rayons que  l'on a reconnus avoir une influence favora  ble sur le traitement de certaines     maladies,     perdent peu à peu leurs facultés de transpa  rence envers ces     rayons,    lorsqu'il y ont été  exposés un     certain    temps. On a, cependant  trouvé que l'on pouvait rendre à. ces verres  par chauffage leurs     propriétés    de transpa  rence envers les rayons     ultra.-violets.     



  La présente invention a pour objet un  procédé, basé sur la constatation ci-dessus,  caractérisé en ce     qu'on    chauffe les     verres     pour leur rendre Tes     propriétés    perdues du  fait d'une exposition à, l'action des     rayons     ultra-violets.  



  Pour mettre en     ocuvre    ce procédé., on peut  opérer de     7.a    façon suivante:  On expose le     verre    auquel on désire ren  dre ses     propriétés    de     transparenpe    à une tem-         pérature    de 550   C pendant une durée de  15 minutes. On peut     aussi    utiliser des tem  pératures inférieures, à. condition, toutefois,  de prolonger la durée du traitement.  



  On peut même aussi exposer les objets de  verre transparent aux rayons     ultraviolets    à  une certaine température pendant toute la du  rée de .leur emploi. Par exemple les dimen  sions d'une ampoule génératrice de rayons       ultra.-violets    pourront être     établies    de telle  façon que pendant toute la. durée de son em  ploi, la chaleur rayonnée ne compense la cha  leur produite que lorsque la température du  verre atteint le degré nécessaire pour main  tenir dans de bonnes     conditions        les:    propriétés  de transparence de l'ampoule envers les ra  diations possédant l'efficacité recherchée.

   De  cette façon, les propriétés du verre seront con  tinuellement régénérées et il ne sera     pas,    né  cessaire de soumettre les ampoules à un trai  tement spécial.



  Process for treating glass from the point of view of its properties of transparency - towards ultraviolet rays. It has been observed that glasses capable of being penetrated by ultraviolet rays, in particular by those of these rays which have been recognized to have a favorable influence on the treatment of certain diseases, gradually lose their faculties of transparency. towards these rays, when they have been exposed to them for a certain time. We found, however, that we could make it to. these glasses by heating their properties of transparency towards ultraviolet rays.



  The present invention relates to a method, based on the above observation, characterized in that the glasses are heated in order to restore them to properties lost due to exposure to the action of ultraviolet rays.



  To carry out this process, the following procedure can be carried out: The glass to which it is desired to return its transparency properties is exposed to a temperature of 550 ° C. for a period of 15 minutes. It is also possible to use tem peratures lower than. condition, however, to prolong the duration of treatment.



  It is even possible to even expose transparent glass objects to ultraviolet rays at a certain temperature during the entire period of their use. For example, the dimensions of a bulb generating ultra-violet rays can be established in such a way that throughout the. during its use, the radiated heat only compensates for the heat produced when the temperature of the glass reaches the degree necessary to maintain in good conditions the: properties of transparency of the bulb towards the radiations having the desired efficiency .

   In this way, the properties of the glass will be continuously regenerated and it will not be necessary to subject the ampoules to a special treatment.

Claims

CLAIM Process for treating glass with a view to restoring to it the properties of transparency towards the ultraviolet rays which it has lost due to having been exposed to the action of said rays, characterized in that this glass is heated .

SUB-CLAIMS 1 Method according to. claim, characterized in that the glass is subjected to. treat for 15 minutes at a temperature of <B> 550 ". </B> 2, A method according to claim. characterized in that the glass is heated throughout the duration of its use to return to it as and when that it loses its properties of transparency towards ultra violet rays.