US1861577A - Method of preparing glass panels - Google Patents

Description

' June 7, 1932. I E MATTMAN 1,861,577 r I v METH OD OF PREPARING GLASS PANELS File d Feb. 25. 1950 ausfave'f/zzifanan Patented June 7, 1932 UNITED]: STATES.

GUSTAVE I. IAT'IIAN, O1! CINCINNATI, OHIO, ASSIGNOB TO THE,OINOINNATI AD- PATEN OFFICE 'VERTISING PRODUCTS COMPANY, 01' CINCINNATI, OHIO, A. COREOBA'IYION OI OHIO METHOD OF PREPARING GLASS PANELS Application filed Iebruary 25, 1980. Serial No. 431,814.

This invention relates to a method of treat ing glass surfaces so that advertising matof a glass display panel having aninner surface carrying advertising matter and a background and an outer surface treated in a novel manner so that it will not emit glare and high lights which render indistinguishable the advertising matter carried by the inner surface and observable through the treated outer surface.

Another object is to provide an efficient.

practical and inexpensive method for the manufacture of glass display panels of the' above type.

These and other objects are attained by the method and means described herein and 1111.15- trated in the accompanying drawing, in which:

Figs. 1 and 2 illustrate a plan view and a cross-sectional view, respectively, of a panel to be treated.

Figs. 3 to 6 inclusive illustrate the various ste is of the process for treating the anel.

ig. 7 is a cross-sectional view of t e completed panel.

Fig. 8 is a greatly enlarged cross-sectional view of the panel showing its condition after the etching treatment.

Display panels of the general type disclosed herein are in common usage on the illuminated globes of gasoline dispensing pumps, for displaying the trade names of the various kinds of gasoline on sale. The display panels of the present invention are adapted for such use, but itis to be understood that the method disclosed herein may be applied also to the manufacture of spherical display globes and to globes of other shapes.

Some of the display panels in common usage have' a ground or etched outer surface with advertising matter painted or otherwise applied to said outer surface. Others have a transparent but glossy outer surface through which may be observed the advertising matter painted or otherwise applied to the rear-or inner surface. The advertising matter of the first mentioned type of panel is more easilyread because of the fact that glare or higlf 'lights are eliminated by re moval of the gloss or finish from the outer surface, but such panels are objectionable be cause of the fact that atmospheric action soon removes or partially removes the exposed painted advertisement. The second mentioned type of panel is objectionable for the reason that the advertising matter thereon 1s rendered indistinguishable by glare or high hghts when viewed from certain angles.

This glare or high light is caused chiefly by the manner disclosed herein, the glare or high lights of the outer surface are reduced sufliciently to render the advertising matter readily distinguishable, the outer surface however remaining transparent so that the advertising matter may beapplied to the inner surface and observed through the outer surface. The improved panel also may be illuminated from the inside during the night season, as is common practice.

The method of treating the panel is as follows. A preferably circular sheet 11 of transparent glass (Figs. 1 and 2) has one of its surfaces 10 exposed to a fine but brief spray .9 (Fig. 3) of paint or other suitable material Which will afford some resistance to the action of dilute. hydrofluoric or other acid suitable for etching glass. The sprayed panel then is immersed in a bath of said acid (Fig. 4) which acts freely upon the under or inner surface 12 of the panel but Which attacks the upper or coated surface 10 only in the minute less etched surface on face 10 than on the unprotected face 12, as is readily understood. The etching on face 10 is lnsufiicient to maprotective coating, however, there is actually applied to the face 12. The background subhavin stance or paint may cover the advertising matter, as indicated.

The next operation is that of firing the panel to set the paint and shape the panel. This is accomplished by placing the panel upon a concave or dished mold 15, (Fig. 6) and subjecting the panel and mold to an intense heat which is sufiicient to cause the panel to soften and sag, of its own weight, assuming the dished shape of the mold. Upon cooling,

the panel is removed from the mold in the' condition indicated in Fig. 7 the advertising matter being on the concave face 12, the convex face 10 carrying the minute spaced etched areas as'above explained.

Because of the character of surface 10 after acid etchingin the presence of minute paint globules as above described, the face 10 is not rendered smooth by the firing operation, as it would be if etched in the absence of such protective globules. The minuteprotective globules insure the formation of comparatively large spaced projections or humps on the surface 10 between the acid etched areas,

. as is disclosed by microscopic inspection.

These projections are sufliciently large and substantial to prevent their collapse or fiattening out during the firing operation. As stated before, the transparency of surface 10 is not materially affected by the treatment, but said surface thereby is rendered substantially free from the objectionable highlights and glare occasioned by light from extraneous sources.

The acid bath used in the process preferably is a solution of hydrofluoric acid and water, in which solution the panel is immersed for a period of several minutes. The strength of the solution and the period of immersion are related factors and must be taken into consideration for attainment of the desired result, as is well known. If the bath is rather strong, the panels should remain there- I in a shorter period of time than would be necessary for a weaker bath, to attain the ance with the invention does not require interior illumination, as do ground glass panels having advertising matter or letters painted upon the interior unexposed glossy face thereof. a i

What is claimed is 1., The method of treating glass objects opposite faces, said method consisting 0 spraying finely atomized acid resist upon oneof the faces whereby to provide on said face numerous minute particles for resisting acid action, immersing the coated object in an etching acid bath capable of attacking glass-surfaces, removing the etched object from the bath, and applyingdecorative matter to the other face thereof.

7 2. The method of treating glass objects having opposite faces, said method consisting ofapplying to one of the faces numerous minute substantially uniformly spaced particles of acid resist, immersing the coated object in an etching acid bath capable of at-' tacking gl'ass'surfaces, removing the etched object from the bath, applying decorative matter to the other face thereof, and firing the decorated object to bake the decorative matter on said face.

3. The method of treating glass objects Q rative matter to the other face of the object.

and firing the decorated object to bake the decorative matter on said face.

4. The method of treating glass objects having opposite faces, said method consisting of applying to one of the faces numerous minute substantially uniformly spaced particles of acid resist, immersing the coated object in an etchin acid bath capable of attacking glass sur aces, removing the etched object from the bath and washing said object to remove the coating material and to check the action of the acid, applying decorative matter to the other face of the object, applying background material to said other face, and firing the decorated object to bake the decorative matter and the background posing the object upon a shaping device, and firing the superposed object for baking the Y decorative matter on said face and for semiliquefying the object thereby causing the object to sag into the shaping device and to assume the interior contour thereof.

6. The method of treating glass objects having opposite faces, said methodconsisting of applying to one of the faces numerous minute substantially uniformly spaced particles of acid resist, immersing the coated object in an etching acid bath'capable of attacking glass surfaces, removing the etched object from the bath and washing to check the action of the acid, applyin decorative matter to the other face of the object, superposing the object upon a shaping device, with the decorative matter uppermost, and firing the superposed object for baking the decorative matter on said face and for semiliquefying the object thereby causing the object to sag into the shaping device and to assume the interior contour thereof.

7 The method of treating glass objects having opposite faces, said method consisting of applying to one of the faces numerous minute substantially uniformly spaced particles of acid resist, immersing the coated object in an etching acid bath capable of attacking glass surfaces, removing the etched objectfromthe bath and washing to check the action of the acid, applying decorative matter to the other face of the object, applying background material to said face, superposing the object upon a concave shaping device, with the decorative matter uppermost, and firing the superposed object and semi-liquefying said object thereby causing it to sag into the concavity of the shaping device and to assume the concave shape thereof.

8. The method of treating glass panels having opposite faces, said method consisting of spraying finel atomized aint u on one of the surfaces vz'hereby to provide on said surface numerous minute particles for resisting acid action, immersing the sprayed panel in an etching acid bath capable of attacking glass surfaces, removing the etched panel from the bath and washing same to check the action of the acid, applying decorative matter to the other face of the panel, superposing the panel upon a shaping device with the decorative matter uppermost, and heating the panel sufiiciently to semi-liquefy the panel and cause it to assume the shape of the shaping device.

In testimony whereof, I have hereunto subscribed my name this 21 day of February,

GUSTAVE F. MATTMAN.

Images