JP2007137748A - Glass sheet with coating film and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a high quality coating film having good appearance and excellent durability. <P>SOLUTION: This method of manufacturing a glass sheet 10 with the coating film comprises a coating step for coating at least one surface 12a (called "coating film surface" hereafter) of the glass sheet having an optional shape with a liquid coating agent and a drying step for drying the applied liquid coating agent, an air stream toward the outer peripheral side from the inner peripheral side of the glass sheet is formed in the peripheral part of the glass sheet after the coating step or during the coating agent is completely dried in the drying step after the coating step. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a glass plate with a coating film and a method for producing the same.

  It has been proposed that an organic anti-fogging coating film or an organic water-repellent coating film is provided on the surface of a glass plate, particularly a glass plate for automobile windows, in order to impart an anti-fogging function or a water repellent function. On the other hand, since glass plates for automobile windows usually have a curved shape, they are heated to a bending temperature of about 600 to about 700 ° C. in order to make a flat glass plate into a curved shape. Therefore, the organic coating film is usually formed by applying a liquid coating agent after forming into such a heating process, that is, a curved shape.

As a method for forming, for example, an organic water-repellent coating film on the surface of a glass plate with a liquid coating agent, there is a method described in Patent Document 1. Patent Document 1 discloses a method for forming a water-repellent coating, in which a coating process of a coating solution for forming a water-repellent coating is performed by a flow method in which the coating solution is poured through an upper edge of a transparent substrate held in the vertical direction. Are listed.
Japanese Patent Application Laid-Open No. 07-291666

  However, in the coating process performed by the flow method as described above, a liquid pool of the coating solution is likely to be generated at the peripheral edge of the transparent substrate to be coated (for details, see FIG. 6 and the later description). If this liquid reservoir is left untreated, a portion where the film thickness of the water-repellent coating increases rapidly is formed at the peripheral portion of the transparent substrate after the subsequent drying step. In this case, distortion can be visually observed at the peripheral edge of the transparent substrate, which may impair the appearance or merchantability of the transparent substrate with a water-repellent coating. Also, depending on the type of functional film to be formed, there is a problem of durability. Also occurs.

  Then, an object of this invention is to provide the glass plate with a coating film in which a peripheral part does not have the part which a film thickness increases rapidly, and its manufacturing method.

In order to solve the above problems, a first invention is a coating provided with a glass plate having an arbitrary shape and a coating film applied to at least one surface of the glass plate (hereinafter referred to as “coating surface”). A glass plate with a film,
The coating film reaches an end edge that forms a boundary line between the coating surface and the end face of the glass plate, and the film thickness gradually increases toward the end edge at the peripheral edge of the glass plate. It has a gradually changing film thickness portion.

2nd invention is the glass plate with a coating film which concerns on 1st invention,
The glass plate has a shape for a vehicle window;
The film thickness gradually changing portion is provided at a peripheral edge portion of the glass plate extending in a substantially vertical direction in a vehicle assembled state.

3rd invention is the glass plate with a coating film which concerns on 1st or 2nd invention,
The distance (L) between the start position of the film thickness gradually changing portion and the end edge at the peripheral edge of the glass plate is 1 ≦ L ≦ 20 mm in a direction perpendicular to the boundary line, To do.

According to a fourth aspect of the present invention, there is provided an application step of applying a liquid coating agent to at least one surface (hereinafter referred to as “coating surface”) of a glass plate having an arbitrary shape, and drying the applied liquid coating agent. A method for producing a glass plate with a coating film, comprising a drying step,
During the coating process, or after the coating process, until the liquid coating agent is completely dried by the drying process, from the inner peripheral side to the outer peripheral side of the glass plate at the peripheral edge of the glass plate. It is characterized by forming a flow of air in the direction of heading.

A fifth invention is a manufacturing method according to the fourth invention,
In the coating step, the glass plate is installed such that the surface is inclined with respect to a horizontal plane, and the liquid coating agent is applied along the peripheral edge of the glass plate positioned on the upper side in the vertical direction in the installed state. A flow coat in which the liquid coating agent is discharged from the nozzle while the nozzle to be discharged and the glass plate are moved relative to each other, and the liquid coating agent is flowed from the upper side to the lower side in the vertical direction on the surface of the film of the glass plate. The method is used.

6th invention is the manufacturing method which concerns on 4th or 5th invention,
A suction device is arranged at a position facing the peripheral edge of the glass plate extending substantially in the vertical direction in the installed state, and the air flow is formed at the peripheral edge by the suction action of the suction device. To do.

  According to the first to third aspects of the invention, there can be obtained a high-quality coated film-coated glass plate having no portion where the film thickness rapidly increases at the peripheral portion, and thus having no distortion and excellent durability.

  According to 4th invention, it produces in the peripheral part of a glass plate after an application | coating process by forming an air flow in the direction which goes to the outer peripheral side from the inner peripheral side of a glass plate in the peripheral part of a glass plate in the application | coating process etc. It is possible to eliminate the accumulation of the liquid coating agent that can be obtained, and therefore, it is possible to produce a high-quality coated film-coated glass plate having no distortion and excellent durability.

  According to the fifth aspect of the present invention, it is possible to eliminate the liquid coating agent pool that may occur at the peripheral edge of the glass plate after the coating step. Coating can be performed.

  According to 6th invention, a required air flow can be locally formed only in the required location of the peripheral part of a glass plate with a suction device.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a view showing the outer shape of a glass plate with a coating film produced according to the present invention. The glass plate 10 with a coating film has an appropriate shape (outer shape) according to a use. The glass plate 10 with a coating film may be used, for example, as a vehicle windshield (windshield) as shown in FIG. 1 (A). It may be used as a door glass. Or although not shown in figure, the glass plate 10 with a coating film may be used for the rear glass of a vehicle, and another use.

  When the glass plate 10 with a coating film is used as a windshield, the glass plate 10 with a coating film is formed by laminating a plurality of (typically two) glass plates having substantially the same shape with an intermediate film interposed therebetween. It is embodied as a laminated glass plate (so-called laminated glass). The intermediate film is made of, for example, polyvinyl butyral (PVB). In this case, in addition to the intermediate film, a linear antenna or a functional sheet having various functions (for example, a UV cut function, a sound insulation function, a heat ray reflection function) may be interposed between the plurality of glass plates. On the other hand, when the glass plate 10 with a coating film is used as a door glass, the glass plate 10 with a coating film is generally composed of a single glass plate (so-called tempered glass) having a predetermined shape.

  Hereinafter, unless otherwise specified, the description will be continued by taking the glass plate 10 with a coating film used as a windshield as an example.

  FIG. 2 is a cross-sectional view of the glass plate 10 with a coating film produced according to the present invention, and is cut along the line AA in FIG. 1 (A) perpendicular to the outline of the glass plate 12. It corresponds to a sectional view.

  As shown in FIG. 2, the coated film-coated glass plate 10 includes a laminated glass plate in which two glass plates 12 and 13 are laminated via an intermediate film 14 as described above, and a surface 12a of the glass plate 12 (hereinafter, “ A coating film (in this example, an organic coating film) 16 applied to the coating surface 12a ”. The glass plate 12 and the glass plate 13 are located on the vehicle outer side and the vehicle inner side, respectively, when the glass plate 10 with the coating film is assembled to the vehicle. As shown in FIG. 2, an opaque colored layer 18 is formed on the surface 13 a of the glass plate 13 to block the field of view from the outside. The opaque colored layer 18 is typically formed by printing black ceramic on the surface 13 a of the glass plate 13. As shown in FIG. 1, the opaque colored layer 18 is formed over the entire circumference of the glass plate 13 at the peripheral edge of the glass plate 13. A window mounting adhesive is applied to the opaque colored layer 18 when the vehicle is assembled. Thereby, the glass plate 10 with a coating film is adhere | attached and hold | maintained to the window sash part (not shown) by the side of a vehicle over the perimeter in the peripheral part. At this time, the window mounting adhesive cannot be visually recognized from the outside of the vehicle by the opaque colored layer 18. The width of the opaque colored layer 18, that is, the width of the opaque colored layer 18 when measured along the direction perpendicular to the outline of the glass plate 12 is set to about 20 mm, for example. The opaque colored layer 18 may be provided on the periphery of the glass plate 12 on the outside of the vehicle (typically, on the vehicle inner surface of the glass plate 12), or on both the vehicle outside and the vehicle inside.

  As described in detail below, the coating film 16 is formed by applying a liquid coating agent to the coating surface 12a of the glass plate 12 and drying the applied liquid coating agent. The coating film 16 in the example shown in FIG. 2 has a water repellent function of repelling water droplets attached to the surface of the glass plate 12. In this case, as the coating agent (coating liquid), for example, an appropriate material as disclosed in JP 2002-226838 A or JP 2001-081445 A may be used.

  In addition, this invention is not limited to the function (material of a coating agent) of said coating film 16. FIG. For example, the coating film may have an anti-fogging function (anti-fogging function) that absorbs moisture attached to the surface of the glass plate 13. In this case, as the coating agent (coating liquid), for example, in addition to the chemical species having an NCO group, the surfactant having an active hydrogen group, and the antifogging urethane component of the polyol, if necessary, a filler component, a dilution solvent It is preferably prepared by mixing a chemical species having an NCO group with a mixture of a surfactant having an active hydrogen group and a polyol. The present invention is not particularly limited by the coating agent having an antifogging function, and suitable materials as disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2004-269851 and 2005-200617 are used. It's okay.

  Usually, a single layer of the coating film 16 provides one function. Therefore, for example, in order to obtain both the antifogging function and the water repellent function, in addition to the above-described coating film 16 for the water repellent function, the surface 13a of the glass plate 13 that is on the vehicle inner side in the vehicle assembled state is protected against the surface 13a. A coating film (not shown) for the fogging function is applied. Thus, the coating film 16 is provided on the surface of the appropriate side of the glass plate 10 with a coating film according to the function to be played. Therefore, for example, in a configuration in which a plurality of coating films are provided, two or more coating films may be provided on the coating surface 12a of the glass plate 12 depending on the functions performed by them. It is possible that two or more coating films are provided on the surface 13 a of 13.

  The liquid coating agent described above is an example of an organic coating agent, but the coating agent may be an inorganic coating agent. For example, as disclosed in JP-T-2004-511381, a liquid coating agent containing conductive oxide fine particles and a matrix component (such as a matrix component using a sol-gel method) such as a precursor of silicon oxide, It can also be considered as a classification of inorganic coating agents. In addition, a coating agent in which conductive oxide fine particles and the like are dispersed in an organic binder can also be called an inorganic coating agent. Further, by dispersing and blending conductive oxide fine particles, particularly infrared shielding fine particles such as tin-doped indium oxide and antimony-doped tin oxide, coloring pigments, and coloring dyes with the above organic coating agent, anti-fogging function and water repellency. Along with the function, an infrared shielding function and coloring performance can be imparted to the glass plate.

  The coating film 16 is formed over substantially the entire region of the coating surface 12 a of the glass plate 12. However, in the case of a windshield, for example, the coating film 16 does not have to be applied to the peripheral portion (lower peripheral portion) on the lower side in the vertical direction covered with the vehicle body side component (cowl portion) in the assembled state of the vehicle. . In this case, the entire region excluding the lower edge of the coating surface 12a is the coating region. In the case of the door glass, the coating film 16 is not applied to the peripheral portion (the peripheral portion of the lower side) on the lower side in the vertical direction that is covered by the vehicle body side components (the door inner panel and the outer panel) in the assembled state of the vehicle. It's okay. In this case, the entire region excluding the lower edge of the coating surface 12a is the coating region.

  As shown in FIG. 2, the coating film 16 has a film thickness constant portion 16 a having a substantially uniform film thickness and a film thickness gradually decreasing toward the end edge Y of the glass plate 12. It has a deformed portion 16b. The end edge Y of the glass plate 12 constitutes the boundary line between the coating surface 12a and the end surface 12c of the glass plate 12, that is, the outline of the glass plate 12. The edge part Y of the glass plate 12 is produced in the cutting process which cuts the base plate of the glass plate 12 into a predetermined shape.

  The starting position X and end of the film thickness gradually changing portion 16b on the coating surface 12a when measured along the length L of the film thickness gradually changing portion 16b, that is, along the direction perpendicular to the outline of the glass plate 12. The distance L to the part edge Y is set within a range of 1 to 20 mm, for example.

  Thus, since the glass plate 10 with a coating film according to the present embodiment has the coating film 16 up to the end edge Y even at the peripheral edge thereof, it covers the entire area (coating area) exposed to the outside in the vehicle assembled state. Thus, the function performed by the coating film 16 can be ensured.

  Furthermore, the glass plate 10 with a coating film according to the present example has the coating film 16 even at the peripheral edge until reaching the end edge Y, while the film thickness gradually changing portion 16b of the coating film 16 is provided at the peripheral edge. Therefore, there is substantially no optical distortion due to a sudden change in the film thickness in the coating film 16, and the appearance when viewed from the outside is good. Since this distortion is particularly noticeable when the opaque colored layer 18 is present behind, by forming the film thickness gradually changing portion 16b of the coating film 16 at the peripheral portion of the glass plate 12 having the opaque colored layer 18 behind, Such deterioration of appearance can be effectively prevented.

  In addition, in a present Example, the glass plate 10 with a coating film does not necessarily need to have the film thickness gradual change part 16b over the perimeter of the glass plate 12, and partially has the film thickness gradual change part 16b. A peripheral portion that is not provided may be included in the covering region. For example, the film thickness gradual change part 16b is provided in the peripheral part (periphery part of a side) of the glass plate 12 extended in a substantially up-down direction in a vehicle assembly state in relation to the manufacturing method described later, It does not have to be provided in the part (for example, the peripheral part of the upper side).

  Further, when the coating film is a coating film for the antifogging function, the glass plate with the coating film has a gradually changing film thickness portion at the peripheral portion thereof, so that the coating film absorbs a large amount of moisture at the peripheral portion. Can be prevented. That is, since the water absorption amount of the coat film increases as the film thickness increases, the water absorption amount of the film thickness gradually changing portion decreases as an absolute amount. The inconvenience caused by the coating film absorbing a large amount of moisture is not a big problem when the coating film is not formed to the edge of the edge by using a glass plate (front glass). It becomes a problem in glass. This is because the peripheral edge of the glass plate with the coating film is located between the run channels of the vehicle during elevation, so that the peripheral edge is located in a place where water easily collects. In a position where water easily accumulates, it is easy to absorb a large amount of water, and the coating film tends to swell. For this reason, the coating film at the peripheral portion containing a large amount of moisture is easily peeled off from the end edge Y. Therefore, in such a case, the glass plate with a coating film has a gradually changing portion of the thickness of the coating film at the peripheral portion thereof, so that the amount of moisture absorbed at the peripheral portion can be reduced. Therefore, even when a glass plate with a coating film provided with a coating film for anti-fogging function is applied to a liftable door glass, peeling of the coating film as described above is effectively prevented, and the coating film Durability is improved.

  Next, with reference to FIG. 3 and subsequent figures, the manufacturing method of the glass plate 10 with a coating film will be described in detail. FIG. 3 is a flowchart showing the main steps of the method for manufacturing the glass plate 10 with a coating film. FIG. 4 is an explanatory diagram of the flow coat method used in the coating process. FIG. 5 is an explanatory diagram of the suction device 80 used in the coating process.

  Referring to FIG. 3, in step 100, a glass plate before the coating film 16 is applied is prepared. In this example, a glass plate is the above-mentioned laminated glass plate that has been curved through a glass forming step. Although not shown, the glass forming process is outlined as follows. The two base plates are individually cut and chamfered, and the opaque colored layer 18 is printed on the peripheral edge of the glass plate 13. Thereafter, the two plates are overlapped with each other, and the peripheral portion is placed on the mold in a state where the two plates are overlapped. Next, the laminated glass plates are heated to a temperature equal to or higher than the bending temperature, and are bent into a curved shape by their own weight. Then, after receiving a slow cooling process, both plates are separated again. Thereby, the glass plates 12 and 13 which have the surface of a mutually substantially the same curvature are formed. Next, the glass plates 12 and 13 go through a cleaning and drying process, and then move to a glass combining process for combining the glass sheet 12 and the glass sheet 13. In the glass bonding step, preliminary pressure bonding is performed with an intermediate film 14 for bonding the glass plates 12 and 13 interposed therebetween, and then main pressure bonding processing by an autoclave (pressure cooker) is performed. As a result, the adhesive surfaces between the glass plates 12 and 13 and the intermediate film 14 are completely deaerated and fused, and a laminated glass plate (laminated glass) is completed.

  In step 110, the coating surface 12a of the glass plate 12 of the laminated glass plate prepared through the glass forming process as described above is cleaned.

  In step 120, a predetermined liquid coating agent ((application liquid)) as described above is applied to the coating surface 12a of the glass plate 12 by a flow coating method. The flow coat method is realized by a coating apparatus that includes a discharge nozzle 72 that discharges a liquid coating agent and a moving mechanism (for example, a robot arm) that moves the discharge nozzle 72 relative to the coating surface 12a. Since the flow coat method is known per se, description of the details of the coating apparatus will be omitted.

  In this step 120, first, the laminated glass plate is installed so as to be inclined with respect to the horizontal plane (for example, it is stood using a supporting jig). At this time, it is desirable that the laminated glass plate be installed in such a posture that the peripheral edge of the lower side is high in the vehicle assembled state and the peripheral edge of the upper side is low in the vehicle assembled state. In the windshield, the lower edge generally has a longer side than the upper edge (see FIG. 1), and the longer edge from the longer edge to the shorter edge. This is because the liquid coating agent can be efficiently applied to substantially the entire surface (coating region) of the coating surface 12a of the glass plate 12 by performing the flow coating in which the liquid coating agent flows to the portion. From the same point of view, in the case of a door glass, it may be installed so that the peripheral edge of the lower side is high in the vehicle assembled state and the peripheral edge of the upper side is low in the vehicle assembled state.

  In this step 120, when the laminated glass plate is installed as described above, as shown in FIG. 4A, the discharge nozzle 72 discharges the liquid coating agent while the peripheral portion of the glass plate 12 ( (Periphery of the lower side) is moved (scanned) from the end edge Y of the peripheral side of one side to the end edge Y of the peripheral side of the other side. As a result, as shown in FIG. 4B, the discharged liquid coating agent flows on the coating surface 12a of the glass plate 12 from above in the vertical direction to below by the action of gravity, and the coating on the glass plate 12 It extends over the entire surface 12a. The amount of liquid coating agent discharged from the discharge nozzle 72 may be about 1.0 g / sec, for example. Further, the moving speed (application speed) of the discharge nozzle 72 may be, for example, about 10 mm / sec along the peripheral edge of the lower side of the glass plate 12.

  In step 120, the discharged liquid coating agent reaches the lower region in the vertical direction with a time delay at the peripheral edge of the other side. Therefore, when the discharge nozzle 72 reaches the end edge Y of the peripheral side of the other side, the discharge of the liquid coating agent from the discharge nozzle 72 is not stopped immediately, but the liquid on the coating surface 12a is stopped. When the spread of the coating agent reaches the region on the lower side in the vertical direction at the peripheral edge of the other side, the discharge of the liquid coating agent from the discharge nozzle 72 is stopped.

  Further, in this step 120, the movement trajectory of the discharge nozzle 72 is such that the liquid coating agent is dripped from a position closer to the center of the glass than the edge Y of the peripheral edge (the peripheral edge of the lower side) of the glass plate 12. To be determined. For this reason, the liquid coating agent is not applied to the peripheral portion (the peripheral portion of the lower side) of the glass plate 12 in the region between the end edge Y and the dropping position. Since the peripheral part (lower peripheral part) of the glass plate 12 is not exposed to the outside when the vehicle is assembled as described above, the liquid coating agent is not applied to the region between the end edge Y and the dropping start position. Because it is good.

  In step 130, the liquid coating agent applied on the coating surface 12a of the glass plate 12 as described above is subjected to room temperature drying treatment. In this case, the laminated glass plate may simply be left for a predetermined time. However, in this embodiment, during the room temperature drying period, as shown in FIG. 4C, using the suction device 80, the peripheral edge of the side edge of the glass plate 12 is changed from the inner peripheral side to the outer peripheral side. An air flow is formed in the direction of heading. This process is a process for forming the film thickness gradually changing portion 16b of the coating film 16 described above, and is hereinafter referred to as “suction process”. The suction process may be performed during the coating process in step 120 described above. In addition, when it is executed during the room temperature drying process as in this example, the laminated glass plate may be moved so as to be horizontal, for example, and the suction process may be performed, or the posture during the coating process in the above step 120 may be performed. You may perform a suction process as it is.

  The suction device 80 has a suction nozzle 82 connected to a negative pressure source (vacuum source) (not shown). The suction nozzle 82 has a suction port of 20 × 5 mm, for example. As shown in FIG. 5, the suction nozzle 82 supplies negative pressure to the peripheral edge of the side of the glass plate 12, and as shown in FIG. 4C, the peripheral edge of the side of the glass plate 12. Are moved (scanned) from one end to the other end. This negative pressure process is similarly performed on the peripheral edge of the side of the other glass plate 12. That is, it is executed for both sides of the glass plate 12. In addition, you may perform similarly with respect to the peripheral part (periphery part of an upper side) located in the vertical direction lower side of the glass plate 12 in the installation state.

  In the example shown in FIG. 5, the suction nozzle 82 is negatively pressured obliquely from above toward the peripheral edge of the side of the glass plate 12 while maintaining a position several millimeters away from the peripheral edge of the side of the glass plate 12. Supply. At this time, the wind speed generated at the peripheral edge of the side of the glass plate 12 may be, for example, about 7.5 m / sec in the direction from the inner peripheral side to the outer peripheral side of the glass plate 12.

  The direction of the suction nozzle 82, that is, the suction direction may be any as long as the component air flows in the direction from the inner peripheral side to the outer peripheral side of the glass plate 12. Therefore, the direction of the suction nozzle 82 is oblique to the outline of the glass plate 12 when viewed in a direction substantially perpendicular to the coating surface 12a of the glass plate 12, as shown in FIG. Good. In this case, the direction of the suction nozzle 82 may change as the suction nozzle 82 moves, or may be fixed. Alternatively, the direction of the suction nozzle 82 is maintained perpendicular to the outline of the glass plate 12 over the entire movement stroke of the suction nozzle 82 when viewed in a direction substantially perpendicular to the coating surface 12 a of the glass plate 12. May be.

  In subsequent step 140, the laminated glass plate that has been subjected to the room temperature drying process and the suction process as described above is subjected to a heat drying process. This heat drying treatment may be about 10 minutes at 60 ° C., for example. As a result, the liquid coating agent applied onto the coating surface 12a of the glass plate 12 as described above is completely dried and fixed, and the glass plate 10 with the coating film is completed. In addition, when providing the coating film for the anti-fogging function, for example, on the surface 13a of the glass plate 13, the coating target surface is changed from the coating surface 12a of the glass plate 12 to the surface 13a of the glass plate 13, and similarly, The processing from step 110 to step 140 is performed.

  Here, the significance of the above-described suction process will be described with reference mainly to FIG. FIG. 6 is a cross-sectional view of the glass plate 10 with a coating film when the above-described suction process is not performed, and corresponds to a cross section taken along the line BB in FIG.

  In the above-described coating process, the liquid coating agent flows so as to spread over the entire coating region of the glass plate 12 as described above, and as shown in FIG. The flow is blocked. As a result, a liquid coating agent pool is generated at the peripheral edge of the side of the glass plate 12. This liquid pool is considered to be mainly caused by the surface tension generated in the liquid coating agent at the peripheral edge of the side of the glass plate 12.

  In the state where the liquid pool exists, as shown in FIG. 4B, streaks or fringes are formed at the peripheral edge of the side of the glass plate 12 due to a sudden change in the thickness of the liquid film of the liquid coating agent. Arise. The thickness of the liquid film of the liquid coating agent is maintained in the same manner even after the drying step described above. For this reason, when the liquid coating agent is completely dried by the above-described heating and drying process while maintaining this liquid pool, a portion having a large film thickness (swelling) is formed on the peripheral edge of the side of the glass plate 12. Occurs. Therefore, in this case, also in the manufactured glass plate 10 with the coating film, as described above, the streaks can be visually recognized at the peripheral edge of the side of the glass plate 12 due to optical distortion, and the glass plate 10 with the coating film is visible. It will not look good or look bad.

  On the other hand, according to the present embodiment, as described above, the suction process for forming the air flow in the direction from the inner peripheral side of the glass plate 12 toward the outer peripheral side with respect to the peripheral portion of the side of the glass plate 12. Is executed. This air flow impairs the balance of the surface tension that causes the liquid pool, and the liquid pool generated at the peripheral edge of the side of the glass plate 12 disappears. That is, the liquid pool generated at the peripheral edge of the side edge of the glass plate 12 is sucked in the direction from the inner peripheral side to the outer peripheral side of the glass plate 12 by the negative pressure supplied from the suction nozzle 82. It flows over the end surface 12c of the glass plate 12 beyond the end edge Y of the peripheral edge of the side (or may be sucked by the suction nozzle 82). As a result, when the liquid coating agent is completely dried by the above-described heating and drying process, as described above with reference to FIG. 2, the peripheral edge of the side of the glass plate 12 in the manufactured glass plate 10 with a coating film. The film thickness gradually changing portion 16b of the coating film 16 is formed at the portion, and the film thickness constant portion 16a is formed at the other covered regions.

  As described above, according to the present embodiment, the liquid pool in the peripheral portion of the side of the glass plate 12 generated by the flow coating of the liquid coating agent is flowed in the direction from the inner peripheral side of the glass plate 12 toward the outer peripheral side. By eliminating by the suction process to be formed, various inconveniences (inconveniences relating to the above-described distortion and durability) due to locally increasing the film thickness of the coating film 16 at the peripheral edge of the side of the glass plate 12 are effective. Thus, it is possible to form a high-quality coating film 16 having good appearance and excellent durability.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the liquid pool generated at the peripheral edge of the side of the glass plate 12 is eliminated by the suction action by the suction device 80 (suction nozzle 82) disposed outside the glass plate 12. The invention is not limited to this. For example, instead of or in addition to the suction device 80, using a spray nozzle (blow nozzle), positive pressure (air flow) from the inner peripheral side of the glass plate 12 to the peripheral edge of the side of the glass plate 12. It is also possible to form an air flow in a direction from the inner peripheral side to the outer peripheral side of the glass plate 12 by supplying (injection).

  In the above-described embodiment, the suction process is executed by the suction nozzle 82 having a suction port that is smaller than the length of the peripheral edge of the side edge of the glass plate 12. In this case, the shape of the glass plate 12 with abundant variations can be handled flexibly only by changing the movement locus of the suction nozzle 82, and the versatility of the suction device 80 is improved. However, the present invention is not limited to this. For example, as shown in FIG. 8, it is possible to use a suction nozzle 82 having a suction port with a width substantially corresponding to the length of the peripheral edge of the side edge of the glass plate 12. In this case, as shown in FIG. 8, the suction nozzle 82 is arranged so that the suction port faces the substantially entire length of the peripheral edge of the side of the glass plate 12, and the glass plate 12 is moved by one suction operation. It is possible to eliminate the above-described liquid pool formed over substantially the entire length of the side edge.

  In the above-described embodiment, the coating agent discharge nozzle 72 is moved. However, the glass plate may be moved.

  As described above, the present invention can be applied not only to the manufacture of automobile window glass but also to the manufacture of glass plates with a coating film for other vehicles, aircraft, ships, buildings, and the like. In addition, the suction treatment according to the present invention is suitable for the coating process by the flow coating method as described above, but can also be used for the coating process by other methods (spray coating, slit coating method, spin coating method). Is possible. The suction treatment according to the present invention is suitable when an organic coating agent is applied as described above, but can also be used when an inorganic coating agent is applied.

It is a figure which shows the external shape of the glass plate with a coating film manufactured by this invention. It is sectional drawing of the glass plate 10 with a coating film manufactured by this invention. It is a flowchart which shows the main processes of the manufacturing method of the glass plate 10 with a coating film. It is explanatory drawing of the flow coat method used at a coating process. It is the schematic which shows the suction device used in an application | coating process by the arrow C of FIG.4 (C). It is sectional drawing of the glass plate 10 with a coating film in case a suction process is not performed. It is the schematic which shows the suction device by other Examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Glass plate with a coating film 12 Glass plate 12a Coating surface 12c End surface 13 Glass plate 13a Surface 14 Intermediate film 16 Coating film 16a Film thickness constant part 16b Film thickness change part 72 Discharge nozzle 80 Suction device 82 Suction nozzle

Claims (6)

A glass plate with a coating film comprising a glass plate having an arbitrary shape and a coating film applied to at least one surface of the glass plate (hereinafter referred to as “coating surface”),
The coating film reaches an end edge that forms a boundary line between the coating surface and the end face of the glass plate, and the film thickness gradually increases toward the end edge at the peripheral edge of the glass plate. A glass plate with a coating film, characterized by having a gradually changing film thickness portion. The glass plate with a coating film according to claim 1, wherein the glass plate has a shape for a vehicle window,
The glass plate with a coating film according to claim 1, wherein the gradually changing film thickness portion is provided at a peripheral edge portion of the glass plate extending in a substantially vertical direction in a vehicle assembled state.   The distance (L) between the start position of the film thickness gradually changing portion and the end edge in the peripheral edge of the glass plate is 1 ≦ L ≦ 20 mm in a direction perpendicular to the boundary line. Or the glass plate with a coating film of 2. An application step of applying a liquid coating agent to at least one surface (hereinafter referred to as “coating surface”) of a glass plate having an arbitrary shape; and a drying step of drying the applied liquid coating agent. A method for producing a glass plate with a coating film,
During the coating process, or after the coating process, until the liquid coating agent is completely dried by the drying process, from the inner peripheral side to the outer peripheral side of the glass plate at the peripheral edge of the glass plate. A manufacturing method, characterized in that an air flow is formed in a direction of heading.   In the coating step, the glass plate is installed such that the surface is inclined with respect to a horizontal plane, and the liquid coating agent is applied along the peripheral edge of the glass plate positioned on the upper side in the vertical direction in the installed state. A flow coat in which the liquid coating agent is discharged from the nozzle while the nozzle to be discharged and the glass plate are moved relative to each other, and the liquid coating agent is flowed from the upper side to the lower side in the vertical direction on the surface of the film of the glass plate. The manufacturing method according to claim 4, wherein the method is used.   5. A suction device is disposed at a position facing a peripheral edge of the glass plate extending in a substantially vertical direction in the installed state, and the air flow is formed at the peripheral edge by a suction action of the suction device. Or the manufacturing method of 5.

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