CA1199888A - Method of applying an opaque screening area - Google Patents
Method of applying an opaque screening areaInfo
- Publication number
- CA1199888A CA1199888A CA000417349A CA417349A CA1199888A CA 1199888 A CA1199888 A CA 1199888A CA 000417349 A CA000417349 A CA 000417349A CA 417349 A CA417349 A CA 417349A CA 1199888 A CA1199888 A CA 1199888A
- Authority
- CA
- Canada
- Prior art keywords
- glass sheet
- masking material
- screening area
- opaque screening
- ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Surface Treatment Of Glass (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The disclosed method is one for applying an opaque screening area (46) to a surface of a glass sheet (40).
The method is initiated by applying to the surface of the glass sheet a masking material (42) which defines the edges of the opaque screening area. The masking material is nonreactive with the glass surface and is heat decomposable into products which can be removed from the glass surface without damage thereto. The masking material extends away from the defined edges of the opaque screening area to provide a wide area of masking material. A ceramic-containing material is applied on areas of the surface of the glass sheet to which the opaque screening areas are to be applied. The ceramic-containing material also coats at least a part of the masking material. The glass sheet is heated to decompose the masking material so that it and any ceramic material overlying it can be removed from the surface of the glass sheet and to heat fuse the fusable components of the ceramic material to the surface of the glass sheet thereby to form the opaque screening area. The decomposed masking material and any ceramic material over-lying it are removed from the glass sheet so that the opaque screening area is defined by a sharp edge which had been defined by the masking material before its removal.
The disclosed method is one for applying an opaque screening area (46) to a surface of a glass sheet (40).
The method is initiated by applying to the surface of the glass sheet a masking material (42) which defines the edges of the opaque screening area. The masking material is nonreactive with the glass surface and is heat decomposable into products which can be removed from the glass surface without damage thereto. The masking material extends away from the defined edges of the opaque screening area to provide a wide area of masking material. A ceramic-containing material is applied on areas of the surface of the glass sheet to which the opaque screening areas are to be applied. The ceramic-containing material also coats at least a part of the masking material. The glass sheet is heated to decompose the masking material so that it and any ceramic material overlying it can be removed from the surface of the glass sheet and to heat fuse the fusable components of the ceramic material to the surface of the glass sheet thereby to form the opaque screening area. The decomposed masking material and any ceramic material over-lying it are removed from the glass sheet so that the opaque screening area is defined by a sharp edge which had been defined by the masking material before its removal.
Description
8~
METHOD OF APPLYING AN OPAQUE SCREENING AREA
This invention relates to a method of applying an opaque screening area to a surface of a glass sheet. In particular, the method is used to apply an opaque screening area to glass sheets which are subsequently used as wind-shields or backlites in vehicles so that certain portions of the viewing area through the glass sheet is rendered opaque. In this manner, certain interior structure of the vehicle is not visible through the glass sheet when one is looking through the glass sheet from the exterior of the vehicle.
In the description of the prior art and of the inven-tion which follows, reference is made to the accompanying drawings, wherein:
Figures l, 2 and 3 generally disclose our prior work with respect to the application of an opaque screening area to a surface of a glass sheet, and Figures 4, 5, 6, 7 and 8 are schematic representa-tions of the steps carri-ed out in accordance with a pre-ferred embodiment of the method of my invention to applyan opaque screening area to a surface of a glass sheet;
the preferred embodiment being illustrated for the manufac-ture of a windshield construction having an opaque screen-ing area extending along its entire perimeter, as will become more apparent in the subsequent por-tions of this specification.
No search was conducted on the subject matter of this disclosure in the U.S. Patent and Trademark Office or in any other search facility. ~e are unaware of any prior art which is relevant to the subject matter disclosed and claimed in this specification.
In Figures l, 2 and 3 there is illustrated a method by which the inventor attempted to obtain an opa~ue screen-ing area on the surface of a glass sheet. This particular process, however, failed for reasons which will be set out in greater detail hereinbelow.
In Yigure l, there is seen a windshield construction prior to lamination generally identified by the numeral 10. This construction is formed of an inner glass sheet ; 12 and an outer glass shee-t 14. The inner ~ . `i ` . i glass sheet 12 has an opaqwe screening area 16 extending around the entire perimeter thereof. The thickness of this screening area is exaggerated in the figures so that it is more readily v;ewable. ~n actuality the thick-ness of the screening area is about 0.001 to 0.002 inches.
The opaque screening area is formed by applying an opaque ceramic-containing paste in the desired pattern to the inner glass sheet 12. Thereafter, the glass sheet is heated, as, for example, in a glass bending or tempering operation, which heating causes components of the ceramic paste to react and bond themselves to the glass surface of the inner glass sheet, there~y to form the opaque screening area 16 fully bonded to the glass.
Figure 2 shows a completed windshield construction 10 in which the inner glass sheet 12 and the outer glass sheet 14 have been laminated together by a suitable lami-nating interlayer in a laminating operation well known to the skilled artisan. Since laminating of glass sheets is well known, no further^discussion--thereof will be under-taken herein. However, the-operatlon does provide a wind-shield construction which has the opaque screenlng area 16 extending around the entire perimeter th~reof.
The opaque screening area is used to block the view of certain interior portions o a motor vehicle from the exterior of that vehicle. For example, when the wind-shield construction 10 is installed in a motor vehicle, the lower portion of the opaque screening area 16, that portion at the bottom of the installed windshield, generally blocks the view from the exterior of the vehicle into the area below the instrument panel of the vehicle.
In a similar manner, from inside the vehicle, the lower portion of the opaque screening area 16 blocks any front seat passenger's view of the interior of the engine compartment, which otherwise could be seen through the lower ~ortion of the installed windshield. T~e side portions and upper portion of the opaque screening area 16 are effective in blocking a view of the clips and assem-bling devices used to fasten windshield moldings and headlinings to the interior of the motor vehicle.
ti~
Thus the opaque screening area 16 provides a means by which certain unsightly portions of the construction of the vehicle are blocked from view from persons either within or without the vehicle.
As is best understood by reference to Figure 3, the inventor initially attempted to develop a method of apply-ing the ceramic-containing paste or making the opaque screening area 16 on the inner glass sheet 12 of the windshield construction in a direct silk screen printing operation. In such a case, a silk screen printing device, generally identified by the numeral 20 in Figure 3, con-tained a silk screen mounted in a frame 22, the silk screen having an emulsion-containing portion 24 and a nonemulsion-containing portion 2~. As is well understood in the art, the nonemulsion-containing portion of the silk screen is that portion of the screen through which paste-like materials may be printed on a surface disposed there-inbelow.
Since the inventor-was operatin~ at the edge of the glass sheet in order to directly print the opaque screen-ing area 16 along the perimeter of the inner glass sheet 12, it was soon found that the sharp edge along the perim-eter of the glass sheet rapidly abraded the nonemulsion-containing portion 26 of the silk screen, thereby render-ing the silk screen useless. The abrasion would occur inless than ten printing operations, which made the entire process extremely expensive due to the high cost o-f contin-ually preparing silk screens. In normal applications, silk screens should be available for use in a printing operation at least ive thousand times.
In view of the initial failure in this area, the inventor looked for a new manne~ of developing the opaque screening area about the perimeter o~ a glass sheet which is to be used subsequently, ~or example, in a motor vehi-35 cle.
This invention relates to a method of applying anopaque screening area to a surface of a glass sheet, and, more particularl~, to a method of applying an opaque screening area to a surface of a glass sheet which is , 8~
subsequently used in a vehicle, the opaque screening area providing a screen to block out the view of cer-tain mechan-ical portions or assembly devices employed in that vehicle.
The method of applying an opaque screening area to a surface of a glass sheet in accordance with the present invention comprises the following steps.
The method is initiated by applying to the surface of the glass sheet a masking material which defines the edges of the opaque screening area to be applied to that glass sheet. The masking material is one which is non-reactive with the surface of the glass sheet. Also, the masking material is a material which is heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto. The masking material is applied to the surface of the glass sheet in a manner which provides a wide area of making material extending away from the defined edges of the opaque screening area to be applied to the glass sheet. In its preferred embodi-ment, the masking materi-al is applied in a silk screen printing operation in which nonernulsion-containing portions of the silk screen do not overlie edges of the glass sheet which may abrade the same.
A ceramic-containing material is applied, as, for example, in a spraying operation, on the areas of the surface of the glass sheet to which the opaque screening areas are to be applied. The ceramic-containing material also coats at least part of the masking material generally along the portion of the masking material defining the edges of the opaque screening area. The ceramic-contain-ing material contains components which are heat fusible tothe surface of the glass sheet to form the opaque screening area.
The glass sheet is heated to carry out at least two operations. One opera-tion is to decompose the masking material so that it and any ceramic material overlying it can be removed from -the surface of the glass sheet without ~L9~
any damage thereto. The second operation is that of heat fusing the heat fusable components of the ceramic materlal to the surface of the glass sheet, thereby to form the opaque screening area on the surface of the glass sheet.
The decomposed masking material and any ceramic material overlying the same is removed. In this manner, the opaque screening area is defined by a sharp edge which has been defined by the masking material before its removal.
In alternate forms of the method of this inven-tion, the heating of the glass sheet may also be to a temperature sufficient so that the glass sheet may be rapidly ~uenched therefrom in order to temper the same.
Such an operation would normally be carried out on a back-lite which is formed from a single sheet of tempe ed glass.
If it was desired to manufacture a windshield, the heating operation would also be associated with a bending operation in which both the inner and outer glass sheets forming the windshield ~construction are bent in a single Eixture at the same time in a manner well known to the skilled artisan. After bending and annealing of such a pair oE glass sheets, they would be laminated together in a normal laminating operation in order to form the finished windshield construction.
The following description is what we consider to be a preferred embodiment of the method of applying an opaque screening area to a surface of a glass sheet in accordance with the invention. ~he following descrip, tion also sets forth what we now contemplate to be the best mode of carrying out the method of this invention.
This description is not intended to be a limitation upon the broader principles of this method, and while preferred materials are used to illustrate the method in accordance with the requirements of the law, it does not mean that the method is operative only with the stated materials, as others may be substituted therefor. Also, for example, the method disclosed herein may be success-fully used with materlals yet to be developed by skilled artisans such as new masking materials or ceramic-containing materials for forming opaque screening areas.
3~
It is therefore contemplated by us that ~hemethod disclosed in this speci~ication may also be success-fully used with materials which are yet to be developed because the principles of operation o~ the method remain the same, regardless of the particular material subjected to the method or used with the method.
Referring to Figures 4 to 8, the method of apply-ing an opaque screening area to a surface of a glass sheet, in accordance with the teachings of a preferred embodiment, is initiated by applying to the surface of a glass sheet 40 a maskîng material 42 (this is best seen in Figure 4). The glass sheet 40 may serve as the inner glass sheet for a windshield construction, which will be described in greater detail hereinbelow. In accordance with the ~eachings of the preferred embodiment, the masking material covers all the central area of the ~lass sheet 40, thereby to define a continuous edge 44 around the perimeter ~f the masking material 42, which in turn defines the continuous edge of where an op~que screening area 46 is to be applled to the glass shçet.
The area for the opaque screening area 4~ lies between the continuou!~ edge 44 of the masking material 42 and the edges of the glass sheet.
The m~skinq material is one which is nonreactive with the surface of the glass sheet at any time durlng and after the application thereof. The masking material 42 also is one which is heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto. A suitable masking material is 20-1316*
made by Drakenfeld of Washington, Pennsylvania. This material is a powder which is then mixed with components such as CUP 9009*resin made by Advance Company of Chicago, Illinois, which is an ultraviolet radiation curable material.
Thus, in accordance with a preferred embodiment of the method o~ the invention, the masking material 42 (as seen in Figure 5) is cured by the application of ultra-violet radiation thereto. As shown in Figure 5, the glass sheet 40, with the masking material 42 supported thereon, * - Trademarks is passed under a plurality o~ UV lamps 48-48. These lamps cause the UV curable components of the masking material to cure, whereby the masking material is tempor-arily bonded to the surface of the glass sheet in the manner desired.
The next step in the method is the step of applying a ceramic-containing material such as a ceramic-containing paint on the areas of the surface of the glass sheet 46 which are to have the opaque screening area 46 applied thereto. As shown in Figure 6, the ceramic-containing paint can be applied through a suitable spraygùn 50 in a manner so that it covers the area 46 to which it is desired to apply the opaque screening material. As is shown in Figure 6, some of the material is applied to the desired area and some of the material is also sprayed over the masking material 42.
The processing of the glass sheet 40 now varies, depending upn whether or not it is going to be manufactured into a backlite or into-a windshield. In Figure 7, there is illustrated the situation in whlch the glass sheet 40 is to be made into a backlite. In this case, the glass sheet is passed through a tempering lehr in which it is heated to a temperature sufficiently high so that when the glass sheet is subsequently quenched from that high temperature the glass sheet will be tempered. Since a tempering operation is well known in the art, no further discussion thereof will be undertaken herein.
In this case, the heating of the glass sheet to the temperature for tempering carries out two additional functions besides heating the sheet. The heating decom-poses the masking material 42 so that it and any of the ceramic paint overlying it can be removed from the surface of the glass sheet without any damage to the surface of the glass sheet. The heat decomposition of the masking material takes place basically because the binder for the masking material is a heat decomposable organic resin. The heating action also fuses the fusable components of the ceramic paint to the surface of the glass sheet, thereby to form the opaque screening area in the area 46 around the perimeter of the glass sheet. After the quenching opera-tion, any masking material which has not been blown away in the quenching operation may be removed, for example, by washing the glass sheet. In general, however, the quenching operation is sufficient to blow away the residue oE the masking material and any ceramic paint in contact therewith, thereby leaving behind the clearly defined opaque screening area.
If one desires to manufacture a windshield, the glass sheet 40 is paired with a second glass sheet 52 and the t~o sheets are simultaneously bent to the desired configuration in a bending furnace. During the passage of the glass sheet 40 through the bending furnace, the heat therein is sufficiently high to decompose the masking material so that it may be removed and to heat fuse the fusable components of the ceramic paint to the surEace of the glass sheet to form the opaque screening area in the area 46 provided therefor. AEter bending and annealing of ~99~
g the glass sheets, the glass sheets are washed, at which time all of the decomposed masking material and ceramic paint overlying the same are removed from the glass sheet 40. The pair of glass sheets then have a plastic inter~
layer material placed therebetween, as is well known in the art, and are subjected to a laminating operation in order to provide a finished windshield in a manner well known to skilled artisans.
While particular embodiments of the invention have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifica-tions may be made without departing from the invention, and it is intended in the appended claims to include all such modifications and equivalents as fall within the true spirit and scope of this invention.
METHOD OF APPLYING AN OPAQUE SCREENING AREA
This invention relates to a method of applying an opaque screening area to a surface of a glass sheet. In particular, the method is used to apply an opaque screening area to glass sheets which are subsequently used as wind-shields or backlites in vehicles so that certain portions of the viewing area through the glass sheet is rendered opaque. In this manner, certain interior structure of the vehicle is not visible through the glass sheet when one is looking through the glass sheet from the exterior of the vehicle.
In the description of the prior art and of the inven-tion which follows, reference is made to the accompanying drawings, wherein:
Figures l, 2 and 3 generally disclose our prior work with respect to the application of an opaque screening area to a surface of a glass sheet, and Figures 4, 5, 6, 7 and 8 are schematic representa-tions of the steps carri-ed out in accordance with a pre-ferred embodiment of the method of my invention to applyan opaque screening area to a surface of a glass sheet;
the preferred embodiment being illustrated for the manufac-ture of a windshield construction having an opaque screen-ing area extending along its entire perimeter, as will become more apparent in the subsequent por-tions of this specification.
No search was conducted on the subject matter of this disclosure in the U.S. Patent and Trademark Office or in any other search facility. ~e are unaware of any prior art which is relevant to the subject matter disclosed and claimed in this specification.
In Figures l, 2 and 3 there is illustrated a method by which the inventor attempted to obtain an opa~ue screen-ing area on the surface of a glass sheet. This particular process, however, failed for reasons which will be set out in greater detail hereinbelow.
In Yigure l, there is seen a windshield construction prior to lamination generally identified by the numeral 10. This construction is formed of an inner glass sheet ; 12 and an outer glass shee-t 14. The inner ~ . `i ` . i glass sheet 12 has an opaqwe screening area 16 extending around the entire perimeter thereof. The thickness of this screening area is exaggerated in the figures so that it is more readily v;ewable. ~n actuality the thick-ness of the screening area is about 0.001 to 0.002 inches.
The opaque screening area is formed by applying an opaque ceramic-containing paste in the desired pattern to the inner glass sheet 12. Thereafter, the glass sheet is heated, as, for example, in a glass bending or tempering operation, which heating causes components of the ceramic paste to react and bond themselves to the glass surface of the inner glass sheet, there~y to form the opaque screening area 16 fully bonded to the glass.
Figure 2 shows a completed windshield construction 10 in which the inner glass sheet 12 and the outer glass sheet 14 have been laminated together by a suitable lami-nating interlayer in a laminating operation well known to the skilled artisan. Since laminating of glass sheets is well known, no further^discussion--thereof will be under-taken herein. However, the-operatlon does provide a wind-shield construction which has the opaque screenlng area 16 extending around the entire perimeter th~reof.
The opaque screening area is used to block the view of certain interior portions o a motor vehicle from the exterior of that vehicle. For example, when the wind-shield construction 10 is installed in a motor vehicle, the lower portion of the opaque screening area 16, that portion at the bottom of the installed windshield, generally blocks the view from the exterior of the vehicle into the area below the instrument panel of the vehicle.
In a similar manner, from inside the vehicle, the lower portion of the opaque screening area 16 blocks any front seat passenger's view of the interior of the engine compartment, which otherwise could be seen through the lower ~ortion of the installed windshield. T~e side portions and upper portion of the opaque screening area 16 are effective in blocking a view of the clips and assem-bling devices used to fasten windshield moldings and headlinings to the interior of the motor vehicle.
ti~
Thus the opaque screening area 16 provides a means by which certain unsightly portions of the construction of the vehicle are blocked from view from persons either within or without the vehicle.
As is best understood by reference to Figure 3, the inventor initially attempted to develop a method of apply-ing the ceramic-containing paste or making the opaque screening area 16 on the inner glass sheet 12 of the windshield construction in a direct silk screen printing operation. In such a case, a silk screen printing device, generally identified by the numeral 20 in Figure 3, con-tained a silk screen mounted in a frame 22, the silk screen having an emulsion-containing portion 24 and a nonemulsion-containing portion 2~. As is well understood in the art, the nonemulsion-containing portion of the silk screen is that portion of the screen through which paste-like materials may be printed on a surface disposed there-inbelow.
Since the inventor-was operatin~ at the edge of the glass sheet in order to directly print the opaque screen-ing area 16 along the perimeter of the inner glass sheet 12, it was soon found that the sharp edge along the perim-eter of the glass sheet rapidly abraded the nonemulsion-containing portion 26 of the silk screen, thereby render-ing the silk screen useless. The abrasion would occur inless than ten printing operations, which made the entire process extremely expensive due to the high cost o-f contin-ually preparing silk screens. In normal applications, silk screens should be available for use in a printing operation at least ive thousand times.
In view of the initial failure in this area, the inventor looked for a new manne~ of developing the opaque screening area about the perimeter o~ a glass sheet which is to be used subsequently, ~or example, in a motor vehi-35 cle.
This invention relates to a method of applying anopaque screening area to a surface of a glass sheet, and, more particularl~, to a method of applying an opaque screening area to a surface of a glass sheet which is , 8~
subsequently used in a vehicle, the opaque screening area providing a screen to block out the view of cer-tain mechan-ical portions or assembly devices employed in that vehicle.
The method of applying an opaque screening area to a surface of a glass sheet in accordance with the present invention comprises the following steps.
The method is initiated by applying to the surface of the glass sheet a masking material which defines the edges of the opaque screening area to be applied to that glass sheet. The masking material is one which is non-reactive with the surface of the glass sheet. Also, the masking material is a material which is heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto. The masking material is applied to the surface of the glass sheet in a manner which provides a wide area of making material extending away from the defined edges of the opaque screening area to be applied to the glass sheet. In its preferred embodi-ment, the masking materi-al is applied in a silk screen printing operation in which nonernulsion-containing portions of the silk screen do not overlie edges of the glass sheet which may abrade the same.
A ceramic-containing material is applied, as, for example, in a spraying operation, on the areas of the surface of the glass sheet to which the opaque screening areas are to be applied. The ceramic-containing material also coats at least part of the masking material generally along the portion of the masking material defining the edges of the opaque screening area. The ceramic-contain-ing material contains components which are heat fusible tothe surface of the glass sheet to form the opaque screening area.
The glass sheet is heated to carry out at least two operations. One opera-tion is to decompose the masking material so that it and any ceramic material overlying it can be removed from -the surface of the glass sheet without ~L9~
any damage thereto. The second operation is that of heat fusing the heat fusable components of the ceramic materlal to the surface of the glass sheet, thereby to form the opaque screening area on the surface of the glass sheet.
The decomposed masking material and any ceramic material overlying the same is removed. In this manner, the opaque screening area is defined by a sharp edge which has been defined by the masking material before its removal.
In alternate forms of the method of this inven-tion, the heating of the glass sheet may also be to a temperature sufficient so that the glass sheet may be rapidly ~uenched therefrom in order to temper the same.
Such an operation would normally be carried out on a back-lite which is formed from a single sheet of tempe ed glass.
If it was desired to manufacture a windshield, the heating operation would also be associated with a bending operation in which both the inner and outer glass sheets forming the windshield ~construction are bent in a single Eixture at the same time in a manner well known to the skilled artisan. After bending and annealing of such a pair oE glass sheets, they would be laminated together in a normal laminating operation in order to form the finished windshield construction.
The following description is what we consider to be a preferred embodiment of the method of applying an opaque screening area to a surface of a glass sheet in accordance with the invention. ~he following descrip, tion also sets forth what we now contemplate to be the best mode of carrying out the method of this invention.
This description is not intended to be a limitation upon the broader principles of this method, and while preferred materials are used to illustrate the method in accordance with the requirements of the law, it does not mean that the method is operative only with the stated materials, as others may be substituted therefor. Also, for example, the method disclosed herein may be success-fully used with materlals yet to be developed by skilled artisans such as new masking materials or ceramic-containing materials for forming opaque screening areas.
3~
It is therefore contemplated by us that ~hemethod disclosed in this speci~ication may also be success-fully used with materials which are yet to be developed because the principles of operation o~ the method remain the same, regardless of the particular material subjected to the method or used with the method.
Referring to Figures 4 to 8, the method of apply-ing an opaque screening area to a surface of a glass sheet, in accordance with the teachings of a preferred embodiment, is initiated by applying to the surface of a glass sheet 40 a maskîng material 42 (this is best seen in Figure 4). The glass sheet 40 may serve as the inner glass sheet for a windshield construction, which will be described in greater detail hereinbelow. In accordance with the ~eachings of the preferred embodiment, the masking material covers all the central area of the ~lass sheet 40, thereby to define a continuous edge 44 around the perimeter ~f the masking material 42, which in turn defines the continuous edge of where an op~que screening area 46 is to be applled to the glass shçet.
The area for the opaque screening area 4~ lies between the continuou!~ edge 44 of the masking material 42 and the edges of the glass sheet.
The m~skinq material is one which is nonreactive with the surface of the glass sheet at any time durlng and after the application thereof. The masking material 42 also is one which is heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto. A suitable masking material is 20-1316*
made by Drakenfeld of Washington, Pennsylvania. This material is a powder which is then mixed with components such as CUP 9009*resin made by Advance Company of Chicago, Illinois, which is an ultraviolet radiation curable material.
Thus, in accordance with a preferred embodiment of the method o~ the invention, the masking material 42 (as seen in Figure 5) is cured by the application of ultra-violet radiation thereto. As shown in Figure 5, the glass sheet 40, with the masking material 42 supported thereon, * - Trademarks is passed under a plurality o~ UV lamps 48-48. These lamps cause the UV curable components of the masking material to cure, whereby the masking material is tempor-arily bonded to the surface of the glass sheet in the manner desired.
The next step in the method is the step of applying a ceramic-containing material such as a ceramic-containing paint on the areas of the surface of the glass sheet 46 which are to have the opaque screening area 46 applied thereto. As shown in Figure 6, the ceramic-containing paint can be applied through a suitable spraygùn 50 in a manner so that it covers the area 46 to which it is desired to apply the opaque screening material. As is shown in Figure 6, some of the material is applied to the desired area and some of the material is also sprayed over the masking material 42.
The processing of the glass sheet 40 now varies, depending upn whether or not it is going to be manufactured into a backlite or into-a windshield. In Figure 7, there is illustrated the situation in whlch the glass sheet 40 is to be made into a backlite. In this case, the glass sheet is passed through a tempering lehr in which it is heated to a temperature sufficiently high so that when the glass sheet is subsequently quenched from that high temperature the glass sheet will be tempered. Since a tempering operation is well known in the art, no further discussion thereof will be undertaken herein.
In this case, the heating of the glass sheet to the temperature for tempering carries out two additional functions besides heating the sheet. The heating decom-poses the masking material 42 so that it and any of the ceramic paint overlying it can be removed from the surface of the glass sheet without any damage to the surface of the glass sheet. The heat decomposition of the masking material takes place basically because the binder for the masking material is a heat decomposable organic resin. The heating action also fuses the fusable components of the ceramic paint to the surface of the glass sheet, thereby to form the opaque screening area in the area 46 around the perimeter of the glass sheet. After the quenching opera-tion, any masking material which has not been blown away in the quenching operation may be removed, for example, by washing the glass sheet. In general, however, the quenching operation is sufficient to blow away the residue oE the masking material and any ceramic paint in contact therewith, thereby leaving behind the clearly defined opaque screening area.
If one desires to manufacture a windshield, the glass sheet 40 is paired with a second glass sheet 52 and the t~o sheets are simultaneously bent to the desired configuration in a bending furnace. During the passage of the glass sheet 40 through the bending furnace, the heat therein is sufficiently high to decompose the masking material so that it may be removed and to heat fuse the fusable components of the ceramic paint to the surEace of the glass sheet to form the opaque screening area in the area 46 provided therefor. AEter bending and annealing of ~99~
g the glass sheets, the glass sheets are washed, at which time all of the decomposed masking material and ceramic paint overlying the same are removed from the glass sheet 40. The pair of glass sheets then have a plastic inter~
layer material placed therebetween, as is well known in the art, and are subjected to a laminating operation in order to provide a finished windshield in a manner well known to skilled artisans.
While particular embodiments of the invention have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifica-tions may be made without departing from the invention, and it is intended in the appended claims to include all such modifications and equivalents as fall within the true spirit and scope of this invention.
Claims (3)
1. A method of applying an opaque screening area to a surface of a glass sheet characterized in that the method has the following steps:
applying to the surface of the glass sheet a masking material which defines the edges of the opaque screening area to be applied to the glass sheet, said masking mater-ial being nonreactive with the surface of the glass sheet and being heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto, said masking material being applied to the surface of the glass sheet to provide a wide area of masking material extending away from said defined edges of the opaque screening area to be applied to the glass sheet;
applying a ceramic-containing material on the areas of the surface of the glass sheet which require the opaque screening areas, said ceramic-containing material also coating at least part of said masking material generally along said portion of said masking material defining said edges of the opaque screening area, said ceramic material containing components which are heat fusible to the surface of the glass sheet to form the opaque screening area;
heating the glass sheet to (1) decompose said masking material so that it and any ceramic material overlying it can be removed from the surface of the glass sheet without any damage thereto, and (2) heat fuse said fusable compon-ents of said ceramic material to the surface of the glass sheet thereby to form the opaque screening area on the surface of the glass sheet; and removing said decomposed masking material and any ceramic material overlying the same whereby the opaque screening material will be defined by a sharp edge which had been defined by said masking material before removal thereof.
applying to the surface of the glass sheet a masking material which defines the edges of the opaque screening area to be applied to the glass sheet, said masking mater-ial being nonreactive with the surface of the glass sheet and being heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto, said masking material being applied to the surface of the glass sheet to provide a wide area of masking material extending away from said defined edges of the opaque screening area to be applied to the glass sheet;
applying a ceramic-containing material on the areas of the surface of the glass sheet which require the opaque screening areas, said ceramic-containing material also coating at least part of said masking material generally along said portion of said masking material defining said edges of the opaque screening area, said ceramic material containing components which are heat fusible to the surface of the glass sheet to form the opaque screening area;
heating the glass sheet to (1) decompose said masking material so that it and any ceramic material overlying it can be removed from the surface of the glass sheet without any damage thereto, and (2) heat fuse said fusable compon-ents of said ceramic material to the surface of the glass sheet thereby to form the opaque screening area on the surface of the glass sheet; and removing said decomposed masking material and any ceramic material overlying the same whereby the opaque screening material will be defined by a sharp edge which had been defined by said masking material before removal thereof.
2. A method of applying an opaque screening area to a surface of a glass sheet characterized in that the method has the following steps:
applying to the surface of the glass sheet a radiation curable masking material which defines the edges of the opaque screening area to be applied to the glass sheet, said masking material being nonreactive with the surface of the glass sheet and being heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto, said masking material being applied to the surface of the glass sheet to provide a wide area of masking material extending away from said defined edges of the opaque screening area to be applied to the glass sheet;
curing said radiation curable masking material by applying curing radiation thereto thereby to form said area of masking material;
applying a ceramic-containing material on the areas of the surface of the glass sheet to which the opaque screening areas are to be applied, said ceramic-containing material also coating at least part of said masking material generally along said portion of said masking material defining said edges of the opaque screening area, said ceramic material containing components which are heat fusable to the surface of the glass sheet to form the opaque screening area;
heating the glass sheet to (1) decompose said masking material so that it and any ceramic material overlying it can be removed from the surface of the glass sheet without any damage thereto, and (2) heat fuse said fusable components of said ceramic material to the surface of the glass sheet thereby to form the opaque screening area on the surface of the glass sheet; and removing said decomposed masking material and any ceramic material overlying the same whereby the opaque screening material will be defined by a sharp edge which had been defined by said masking material before removal thereof.
applying to the surface of the glass sheet a radiation curable masking material which defines the edges of the opaque screening area to be applied to the glass sheet, said masking material being nonreactive with the surface of the glass sheet and being heat decomposable into products which can be removed from the surface of the glass sheet without damage thereto, said masking material being applied to the surface of the glass sheet to provide a wide area of masking material extending away from said defined edges of the opaque screening area to be applied to the glass sheet;
curing said radiation curable masking material by applying curing radiation thereto thereby to form said area of masking material;
applying a ceramic-containing material on the areas of the surface of the glass sheet to which the opaque screening areas are to be applied, said ceramic-containing material also coating at least part of said masking material generally along said portion of said masking material defining said edges of the opaque screening area, said ceramic material containing components which are heat fusable to the surface of the glass sheet to form the opaque screening area;
heating the glass sheet to (1) decompose said masking material so that it and any ceramic material overlying it can be removed from the surface of the glass sheet without any damage thereto, and (2) heat fuse said fusable components of said ceramic material to the surface of the glass sheet thereby to form the opaque screening area on the surface of the glass sheet; and removing said decomposed masking material and any ceramic material overlying the same whereby the opaque screening material will be defined by a sharp edge which had been defined by said masking material before removal thereof.
3. The method of claim 2, in which said radiation curable masking material is a UV curable material and UV light is applied thereto to cure the same.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35600082A | 1982-03-08 | 1982-03-08 | |
| US356,000 | 1982-03-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1199888A true CA1199888A (en) | 1986-01-28 |
Family
ID=23399662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417349A Expired CA1199888A (en) | 1982-03-08 | 1982-12-09 | Method of applying an opaque screening area |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1199888A (en) |
| MX (1) | MX157410A (en) |
-
1982
- 1982-12-09 CA CA000417349A patent/CA1199888A/en not_active Expired
-
1983
- 1983-01-05 MX MX19582883A patent/MX157410A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX157410A (en) | 1988-11-22 |
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