DE1646095B1 - Process for applying a uniform, thin coating to the inner surface of capillaries - Google Patents

Claims (1)

1 2 The invention relates to a method for being able to have, in particular, even complex shapes, applying a uniform, thin coating and extremely small openings,
An adhesive material on the inner surface of a preferred embodiment of capillaries, in particular for the production of self-luminous form of the invention in an embodiment of the light sources by applying a phosphorus is explained below, the method being used in the formation of phosphor particles-containing suspension. a phosphor coating for a tubular light A known method of forming a source is used. Phosphorus coating on the inner surfaces of Ge A glass tube with an inner diameter of Hausen for light sources consists in that first 0.6 cm is very thoroughly with a four percent a solution of a viscous substance or an io aqueous solution of hydrofluoric acid purified, Binder, e.g. B. orthophosphoric acid, on the to be coated with distilled or deionized water Surfaces are applied that wash and dry. then the solvent is evaporated and that a one percent solution of orthophosphorus additives of a phosphorus, e.g. B. zinc sulfide, added acid in acetone or ether will be in one end of the. The excess phosphorus is removed, the pipe is inserted to form a plug of the liquid and a phosphor coating remains, which is formed on the one in the pipe that has adhered to the upper binding agent. The coating is then treated so that the surface tension of the liquid is maintained in the tube that it binds the binder and becomes one. The amount of solution is sufficient to ensure that the coating is stable. In the case of orthophosphorus strips that when the plug is removed from an acid, the light source housing is heated in order to move the end of the tube to the other, which does not tear the viscous form of the acid into a hard, glass-like meniscus and the liquid about the borrowed substance is converted. Tube maintains the plug shape. An excess of Ä Furthermore, a method for disguising fluid is not critical, but it should not be so a metal pipe with insulating material known to be great that the inertia of the mass is the free which in the pipe interior prevents the insulating material 25 from moving the plug, containing solution in such an amount a The glass tube is about a rapidly responding is led that they put the amount needed to form the valve to a compressed air source, the one Plating is required exceeds. This solution creates pressure of about 1.05 kg / cm ^2. The valve will is left in the tube while heat is supplied and the plug quickly opens through the tube is blown so that a coating 30 is blown on the inner surface, with a thin coating of solution on the is trained. The solution will then remain with the walls of the pipe. The airflow Controlled speed withdrawn and the tube evaporates the solvent sufficiently quickly so that heated so that the coating hardens; furthermore, the material of the viscous binder becomes uniform inert gas is fed in to cool the tube and remains applied to the inner walls before to remove the xylene vapor. 35 the surface tension of the binder solution Finally, a method is also known that can dissolve the coating into droplets,
A plug of liquid with compressed air through a The tube is driven at about 100 ° C for about ten seconds. A dries, then excess phosphorus additive-like method is only given for straight pipes 4 °, distributed over the viscous binder and, applicable with a relatively large diameter, the excess is removed. The tube and the coating cannot be used in the case of capillaries, in particular sol- are finally treated with heat, so that the small pieces with a curved shape. - Binder bound in a stable state t The aim of the present invention is to provide an equal. shaped thin coating on the inner surfaces of 45. Tubes of any material according to the capillaries, in particular self-luminous lights, can be coated inside, swell in advance, set quickly and in a particularly simple manner that the dimensions of the tubes can be applied for one. Material plug in solution, which is to be carried within the raw according to the invention, res should be carried by surface tension that in one end of the capillary a plug from 50 correspond to a capillary. The internal dimensions of a liquid substance containing the adhesive material in solution or suspension need not be inserted uniformly over the entire tube. The method is particularly suitable for pipes, and that the plug is driven with the help of a pressure, which are curved or bent, or a regular air jet closing the capillary through the latter moderate or irregular cross-section or one, whereby "at the same time the liquid carrier 55 combination of such The size of the plug, which, according to other methods, is driven only under special heavy capillaries, is chosen only to be large enough to allow it to be covered Numerous other materials are kept in contact with the inner surface of the capillaries than those described here as inner coatings, a thin coating of a 60 being used for pipes, and the adhesive material can remain on the inner surface The method according to the invention is s can be changed quickly and according to use cases,
can be carried out in a particularly simple manner; the coating can be applied in seconds, and the claim:
Heating takes place depending on the thickness of the coating 65 also in a few seconds. A special pre-process for applying a uniform Part of the invention also results from the fact that gene, thin coating of an adhesive material Light tubes are manufactured in series production on the inner surface of capillaries, in particular 3 4 their liquid containing self-luminous light solution or suspension swell by applying a phosphorus substance is used and that the plug containing suspension, thereby marked with the help of a compressed air jet the capillary shows that one end of the capillary is driven through the latter to close it, where- a plug from a the adhesive material in 5 at the same time the liquid carrier evaporates.