JP5494254B2 - Manufacturing method of automotive window glass with coating - Google Patents

Description

  The present invention relates to a method for manufacturing a coated automotive window glass.

  Glass for automobiles is usually provided with a coating on the glass surface for the purpose of shielding ultraviolet rays, shielding infrared rays, imparting water repellency, imparting anti-fogging properties, and the like. As a method for producing such an automotive glass with a coating, a method of forming a coating by applying a coating solution to a glass plate by a flow coating method and drying the coating is widely used.

  For example, Patent Document 1 discloses that an infrared cut liquid is ejected by using a nozzle on the top of the glass plate in a state where the side (upper side) which becomes the upper side when the glass plate is assembled to a vehicle is held upward. A method of applying an infrared cut liquid on a glass plate by causing the infrared cut liquid injected on the upper part of the glass plate to flow vertically downward is shown.

  Further, Patent Document 2 discloses that an infrared cut liquid is ejected using a nozzle on the upper part of the glass plate while the glass plate is held on the lower side when the glass plate is assembled to the vehicle. A method of applying an infrared cut liquid on a glass plate by causing the infrared cut liquid injected on the upper part of the glass plate to flow vertically downward is shown.

JP 2007-191322 A JP 2007-176443 A

However, among the glass for automobiles, the shape of the window glass that can be opened and closed is particularly different depending on the front and rear doors of the automobile, the vehicle type, and the like. Therefore, as in the method of Patent Document 1, just by supplying the coating liquid from only the upper side with the upper side of the glass plate up, when applying the coating liquid to the window glass for automobiles of various shapes, The appearance quality may be deteriorated by causing smears.
Further, when a film having a film thickness of several μm or more is provided on the surface of the window glass for an automobile, the film in the vicinity of the upper side of the window glass for the automobile is Rubbing with the glass housing may cause scratches and poor appearance. Furthermore, when a coated window glass is formed on the concave side of a curved window glass and the film exists up to the upper edge of the window glass, the upper side of the window glass is transported into the heating furnace with the concave side down. The coating film at the end may come into contact with the heated conveyor of the heating furnace, and the coating film may be peeled off or whitened. The upper side of the window glass is a portion that can be seen after being attached to an automobile, and such peeling / whitening phenomenon is a big problem in appearance quality. Further, as in the method of Patent Document 2, when the coating liquid is supplied only from the lower side with the lower side of the glass plate up, the coating liquid reaches the upper side of the glass plate. Problems can arise.

  INDUSTRIAL APPLICABILITY The present invention provides an automobile window glass with a coating that can provide a window glass that can be opened and closed with excellent appearance quality, and that can suppress the formation of scratches on the coating provided on the glass surface even when repeatedly opened and closed. The purpose is to provide a method.

The present invention employs the following configuration in order to solve the above problems.
[1] The window glass is held in a state where the upper side of the window glass of the openable / closable window of the automobile is raised, and a predetermined amount is provided on at least one surface of the window glass from the upper side of the window glass. An application process for discharging and applying a coating liquid from the nozzle while relatively moving the window glass and the nozzle in the order of the following first to third processes so that the width area becomes a non-application area;
A drying step of drying the coating solution applied in the coating step to form a film on the window glass;
I have a,
The vehicle window glass with a coating film , wherein the predetermined width is equal to or greater than a width of a region in which the window glass is stored in a glass storage portion of the upper frame of the door when the window is closed . Production method.
First step: A step of relatively moving the nozzle upward along the one side of the window glass to the lower edge of the non-application area.
Second step: A step of relatively moving the nozzle from the one side to the other side along the lower edge of the non-application region of the window glass.
Third step: A step of relatively moving the nozzle downward from the lower edge of the non-application region along the other side of the window glass.
[2] The lengths of the two side portions of the window glass are different from each other, the nozzle is relatively moved along the long side in the first step, and the length is short in the third step. The manufacturing method of the window glass for motor vehicles with a film as described in said [1] which moves a nozzle relatively along a side.
[3] The method for producing a window glass for automobiles with a coating according to [1] or [2], wherein the window glass is curved, and the coating liquid is applied to a concave surface side of the window glass.
[4] Any of [1] to [3], wherein the relative movement speed of the nozzle in the first step and the relative movement speed of the nozzle in the third step are faster than the relative movement speed of the nozzle in the second step. The manufacturing method of the window glass for motor vehicles with a film as described in 1 item | term.

  According to the manufacturing method of the present invention, a window glass capable of opening and closing an automobile excellent in appearance quality is obtained, and furthermore, a coated automobile capable of suppressing the formation of scratches on the coating on the upper side portion of the glass even when repeatedly opened and closed. Window glass is obtained.

It is the front view (A) which showed an example of the window glass for motor vehicles used for the manufacturing method of this invention, and its side view (B). It is the side view of the window glass for motor vehicles which showed the application | coating process in the manufacturing method of this invention. It is the side view (A) of the window glass for motor vehicles which showed the application | coating process in the manufacturing method of this invention, (B). It is the side view (A) of the window glass for motor vehicles which showed the application | coating process in the manufacturing method of this invention, (B). It is explanatory drawing of the measurement position of the film thickness of the film in an Example.

  The method for producing a coated window glass for an automobile of the present invention comprises: a coating step of applying a coating solution by flow coating on at least one surface of a window glass that can be opened and closed; and a coating solution applied in the coating step. And a drying step of forming a film by drying.

  The material of the window glass that can be opened and closed for automobiles is not particularly limited, and examples thereof include inorganic glass such as soda lime glass, borosilicate glass, alkali-free glass, and quartz glass, and organic glass such as polycarbonate and acrylic.

Examples of the window glass that can be opened and closed in an automobile include window glass that can be opened and closed and that can be opened and closed attached to a front or rear door of the automobile. The window glass produced by the method of the present invention has a good appearance quality because the film is hardly scratched or peeled off even when it is opened and closed. There are various types of window glass. FIG. 1A shows a front view of an openable / closable window glass 10 as an example of an openable / closable window glass of an automobile.
In the window glass 10, as shown in FIG. 1A, one side 11 (hereinafter simply referred to as “side 11”) is the other side 12 (hereinafter simply referred to as “side 12”). Longer and the upper side 13 is curved. Further, the angle α formed between the side 11 and the lower side 14 of the window glass 10 is larger than 90 °, and the angle β formed between the side 12 and the lower 14 is smaller than 90 °. Further, as shown in FIG. 1B, the window glass 10 is curved so that the concave surface 10a is concave and the convex surface 10b is convex. The window glass 10 is attached to the front door of the automobile so that the concave surface 10a is on the inner side with the side 12 side in front and the side 11 in back. When the window is closed, the upper side 13 of the window glass 10 is stored in the glass storage section of the upper frame of the door. The region of the window glass 10 on the lower side 14 side from the belt line L is accommodated in the door even when the window glass is closed.
Hereinafter, as an example of a method for producing a coated window glass for automobiles of the present invention, a method for obtaining a coated automobile window glass by forming a film on the concave surface 10a side of the window glass 10 will be described.

Application process:
In the coating process, as shown in FIG. 2, the window glass 10 is held with its upper side 13 up. And as shown to FIG. 1 (A), the non-application area | region of the concave surface 10a so that the area | region of predetermined width d from the upper side 13 in the concave surface 10a of the window glass 10 may become the non-application area | region A which does not apply | coat a coating liquid. A coating solution is applied to a region B other than A by a flow coating method. However, when the vicinity of the lower side 14 is masked with a mask member, the coating liquid is not applied to the mask region.

The difference between the width d and the width of the region stored in the glass storage portion of the upper frame of the door (hereinafter referred to as “glass storage width”) when the window is closed at the door of the automobile may be small. .
When the width d is equal to or greater than the glass storage width, the region B is not stored in the glass storage portion of the upper frame of the door even if the window of the automobile door is repeatedly opened and closed. For this reason, the coating provided in the region B does not rub against the glass storage portion, and even if the window is repeatedly opened and closed, it is possible to prevent the coating from being damaged and the appearance from being deteriorated. In addition, the width d is preferably as close as possible to the glass storage width from the viewpoint that the function by the film can be sufficiently obtained.
When the width d is less than or equal to the glass storage width, the function of the coating is sufficiently obtained. Further, in order to prevent the coating provided in the region B from rubbing against the glass storage portion, the width d is preferably as close as possible to the glass storage width.
For the purpose of suppressing damage to the coating, the width d is preferably equal to or greater than the glass storage width.
Specifically, the difference between the width d and the glass storage width is preferably 0 mm to 10 mm, more preferably 0.5 mm to 5 mm, and particularly preferably 1 mm to 3 mm. The difference between the width d and the glass storage width includes both the case where the width d is smaller than the glass storage width and the case where the width d is larger than the glass storage width. Further, the difference between the width d and the glass storage width being 0 mm means that the width d and the glass storage width are the same.

  The method of holding the window glass 10 in an upright state is not particularly limited, and examples thereof include a method of holding the suction cup in close contact with the convex surface 10b on the window glass 10 on which the coating liquid is not applied.

The following method (i) and method (ii) are mentioned as a method of supplying a coating liquid from the nozzle 20 to the area | region B in the concave surface 10a of the window glass 10. FIG.
Method (i): A method of starting application of the coating liquid to the region B of the concave surface 10a from the side 11 side and ending at the side 12 side.
Method (ii): A method in which application of the coating liquid to the region B of the concave surface 10a starts from the side 12 side and ends on the side 11 side.

(Method (i))
In the method (i), as shown in FIG. 3A, the coating liquid is discharged while the window glass 10 and the nozzle 20 are relatively moved in the order of the following steps (i-1) to (i-3). It is.
(I-1) A first step in which the nozzle 20 is relatively moved upward along the side 11 of the concave surface 10a to the lower edge a of the non-application area A.
(I-2) A second step in which the nozzle 20 is relatively moved from the side edge 11 to the side edge 12 along the lower edge a of the non-application area A of the concave surface 10a.
(I-3) A third step of relatively moving the nozzle 20 downward from the lower edge a of the non-application area A along the side 12 of the concave surface 10a.
The relative movement of the window glass 10 and the nozzle 20 in the method (i) may be such that the position of the window glass 10 is fixed and the nozzle 20 is moved, or the position of the nozzle 20 is fixed and the window glass 10 is moved. The window glass 10 and the nozzle 20 may be moved relative to each other. Especially, it is preferable to move the nozzle 20 while fixing the position of the window glass 10 from the viewpoint of easily suppressing the liquid cracking of the coating liquid and the wrapping of the coating liquid to the opposite glass surface.

  When the coating solution is applied by the method (i), as shown in FIG. 4A, the coating solution 31 supplied in each step flows through the concave surface 10a toward the lower side 14 due to its own weight, and FIG. As shown, the coating liquid is applied to the entire region B of the concave surface 10a. In the coating solution, a volatile component such as an organic solvent is volatilized in the air, and the concentration of solid content increases and flows through the concave surface 10a while being concentrated.

In the method (i), as described above, the coating liquid is applied to the region B of the concave surface 10a while relatively moving the window glass 10 and the nozzle 20 in the order of the step (i-1) to the step (i-3). In addition, smearing of the coating liquid in the region B can be suppressed, and the wraparound of the coating liquid to the convex surface 10b where the coating liquid is not applied can be suppressed. These factors are considered as follows.
The coating liquid supplied to the concave surface 10a flows toward the lower side 14 through the concave surface 10a by its own weight. Therefore, for example, when the application liquid is applied to the region B in the concave surface 10a of the window glass 10 only in the step (i-2) without performing the step (i-3), the side 12 spreads toward the bottom. Therefore, in the vicinity of the side edge 12 of the concave surface 10a, there is a tendency for paint leakage to occur where the coating liquid is not partially applied. Further, when the application liquid is applied to the region B in the concave surface 10a of the window glass 10 only in the step (i-2) without performing the step (i-1), the side 11 is incurved as it goes to the lower side. Therefore, the coating liquid tends to wrap around the glass surface on the opposite side of the window glass 10.
On the other hand, in the method (i), when the coating liquid supplied to the upper side of the side 11 flows through the portion where the coating liquid is applied along the side 11 in the step (i-1), the coating liquid Since the coating liquid flows along the side 11, it is possible to prevent the coating liquid from entering the glass surface on the opposite side of the window glass 10. Moreover, application | coating liquid can be prevented by apply | coating a coating liquid along the side 12 in a process (i-3).
In addition, the flow to the lower side 14 of the coating liquid supplied in the vicinity of the lower edge a of the non-application area A in the area B by the process (i-2) is applied to the coating liquid previously applied in the process (i-1). Since it is easy to flow along, it becomes smoother. Therefore, liquid cracking due to branching of the flow of the coating liquid is suppressed.

In the step (i-2), when the coating liquid supplied to the concave surface 10a of the window glass 10 flows toward the lower side 14, if the flow rate is slow, the flow of the coating liquid may branch and cause liquid cracking. is there. Therefore, it is preferable to make the inclination angle θ (FIG. 2) of the window glass 10 with respect to the horizontal plane close to 90 ° for the purpose of preventing the flow of the coating liquid from branching and cracking. As the inclination angle θ of the window glass 10 with respect to the horizontal plane is closer to 90 °, the flow rate when the coating liquid supplied to the concave surface 10a flows toward the lower side 14 becomes faster, and the liquid cracking of the coating liquid is less likely to occur.
The inclination angle θ with respect to the horizontal plane of the window glass 10 means an angle formed by a horizontal plane and a plane that is in contact with the central portion of the convex surface 10b that is a non-coated surface of the window glass 10.

  Moreover, the angle φ (FIG. 4A) of the nozzle 20 with respect to the concave surface 10a of the window glass 10 is preferably as small as possible. When the angle φ of the nozzle 20 is smaller, the direction in which the coating liquid is discharged from the nozzle 20 approaches parallel to the concave surface 10a of the window glass 10, and the flow rate of the coating liquid discharged from the nozzle 20 comes into contact with the concave surface 10a. Therefore, it is difficult for the coating liquid to crack.

The relative movement speed of the nozzle 20 varies depending on the viscosity of the coating liquid, the discharge amount of the coating liquid, the height of the window glass 10, and the like, and may be determined as appropriate in consideration of suppression of liquid cracking of the coating liquid and productivity. . The relative movement speed of the nozzle 20 is the movement speed of the nozzle 20 as viewed from the window glass 10.
In the steps (i-1) and (i-3), the relative movement vector of the window glass 10 and the nozzle 20 has a vertical component as a main component and a small component in the horizontal direction. On the other hand, the vector of relative movement between the window glass 10 and the nozzle 20 in the step (i-2) is mainly in the horizontal direction. Since liquid cracks are more likely to occur as the horizontal relative movement speed increases, the relative movement speed v ₁ of the nozzle 20 in the step (i-1) and the relative movement speed v ₂ of the nozzle 20 in the process (i-2) In relation to the relative movement speed v ₃ of the nozzle 20 in the step (i-3), it is preferable that the relative movement speeds v ₁ and v ₃ are faster than the relative movement speed v ₂ .
The relative movement speeds v ₁ , v ₂ , v ₃ of the nozzle 20 may be constant speeds or may change in the middle, but the relative movement speed v ₂ is higher on the side 11 side than on the side 12 side. It is also preferable that it is slow. This is because the coating liquid supplied from the nozzle 20 to the concave surface 10a increases in solid content concentration due to volatilization of volatile components as the distance flowing toward the lower side 14 increases, so that the flow velocity in the vicinity of the lower side 14 decreases. Since the height of the window glass 10 increases from the side 12 to the side 11, the distance on which the coating solution flows is longer on the side 11 side of the concave surface 10a. Therefore, the relative movement velocity _{v 2} of the nozzle 20 in the step (i-2) is preferably a slow nozzle 20 is closer to the side edge 11. Accordingly, the coating liquid easily flows toward the lower side 14 even on the side 11 having a high height, and liquid cracking due to a decrease in the flow rate of the coating liquid is less likely to occur.

  In the method (i), the relative movement start position of the window glass 10 and the nozzle 20 in the step (i-1), that is, the position where the application of the coating liquid is started is from the side 11 side of the concave surface 10a to the convex surface 10b. As long as the coating liquid can be applied while preventing the coating liquid from flowing around.

  The end position of the relative movement between the window glass 10 and the nozzle 20 in the step (i-3), that is, the position at which the application of the coating liquid is finished does not cause a smear on the lower side 14 near the side 12 of the concave surface 10a. As long as the coating solution can be applied to the substrate, the coating solution may be applied. For example, if the angle β formed between the side 12 and the lower side 14 of the window glass 10 being held is close to vertical, the application liquid is applied at the intermediate position in the height direction on the side 12 in the step (i-3). Even if it complete | finishes, a coating liquid can be apply | coated, without producing a smear on the lower side 14 side near the side 12 of the concave surface 10a. On the other hand, when the angle β formed between the side 12 and the lower side 14 is small and the lower side 14 on the side 12 side of the window glass 10 has a widened shape, the paint is smeared on the lower side 14 near the side 12. In order not to occur, application | coating of the coating liquid in a process (i-3) is complete | finished in the position as close to the lower side 14 as possible.

(Method (ii))
As shown in FIG. 3B, the method (ii) is a method of discharging the coating liquid while relatively moving the window glass 10 and the nozzle 20 in the order of the following steps (ii-1) to (ii-3). It is.
(Ii-1) A first step in which the nozzle 20 is relatively moved upward along the side 12 of the concave surface 10a to the lower edge a of the non-application area A.
(Ii-2) A second step of relatively moving the nozzle 20 from the side edge 12 to the side edge 11 along the lower edge a of the non-application area A of the concave surface 10a.
(Ii-3) A third step of relatively moving the nozzle 20 downward from the lower edge a of the non-application area A along the side edge 11 of the concave surface 10a.
The relative movement between the window glass 10 and the nozzle 20 in the method (ii) may be performed by fixing the position of the window glass 10 and moving the nozzle 20 as in the method (i). The window glass 10 may be moved, and the window glass 10 and the nozzle 20 may be moved relative to each other. Especially, it is preferable to move the nozzle 20 while fixing the position of the window glass 10 from the viewpoint of easily suppressing the liquid cracking of the coating liquid and the wrapping of the coating liquid to the opposite glass surface.

As in the method (i), the coating liquid supplied to the concave surface 10a of the window glass 10 flows through the concave surface 10a toward the lower side 14 by its own weight, and the coating liquid is applied to the entire region B of the concave surface 10a.
The method (ii) is the same as the method (i) except that the position where the relative movement of the window glass 10 and the nozzle 20 is started and the position where the window glass 10 and the nozzle 20 are started are opposite, that is, the position where the application of the coating liquid starts and ends. Is the method. According to the method (ii), the smear of the coating liquid can be suppressed for the same reason as the method (i).

  Further, as in the method (i), the inclination angle θ with respect to the horizontal plane of the window glass 10 in the method (ii) is easy to suppress the liquid cracking of the coating liquid and the wraparound to the convex surface 10b side which is a non-coated surface. It is preferably close to 90 °. Moreover, the angle φ of the nozzle 20 with respect to the concave surface 10a of the window glass 10 in the method (ii) is preferably as small as possible.

Further, the relative movement speed v ₄ of the nozzle 20 in the step (ii-1), the relative movement speed v ₅ of the nozzle 20 in the step (ii-2), and the relative movement speed v ₆ of the nozzle 20 in the step (ii-3). Are the same as the relative movement speeds v ₁ , v ₂ , v ₃ of the nozzle 20 in the method (i).
In the vicinity of the side edge 12 and the vicinity of the side edge 11, the vector of relative movement of the window glass 10 and the nozzle 20 in the steps (ii-1) and (ii-3) has a vertical direction as a main component, while the step (ii) The horizontal movement vector is the main component of the relative movement vector of the window glass 10 and the nozzle 20 in -2. Since liquid cracks are more likely to occur as the horizontal relative movement speed increases, the relative movement speed v ₄ of the nozzle 20 in the step (ii-1) and the relative movement speed v ₅ of the nozzle 20 in the process (ii-2) In relation to the relative movement speed v ₆ of the nozzle 20 in the step (ii-3), it is preferable that the relative movement speeds v ₄ and v ₆ are faster than the relative movement speed v ₅ .
In addition, the relative movement speeds v ₄ , v ₅ , and v ₆ of the nozzle 20 in the steps (ii-1) to (ii-3) may be constant speeds or may be changed in the middle. It is preferable that the moving speed v ₅ is slower as it is closer to the side 11. This makes it difficult for the coating liquid to break even on the side 11 having a high height. It is preferable that the relative movement speed v ₄ and the relative movement speed v ₆ of the nozzle 20 are slower as they are closer to the upper side 13.

  In the method (ii), the relative movement start position of the window glass 10 and the nozzle 20 in the step (ii-1), that is, the position where the application of the coating liquid is started is applied to the lower side 14 near the side 12 of the concave surface 10a. What is necessary is just the range which can apply | coat a coating liquid, without producing a leak. If the angle β formed between the side 12 and the lower side 14 of the held window glass 10 is close to vertical, application of the coating liquid is started from the intermediate position in the height direction on the side 12 in step (ii-1). Even in this case, the coating liquid can be applied without causing any coating on the lower side 14 near the side 12 of the concave surface 10a. On the other hand, when the angle β formed between the side 12 and the lower side 14 is small and the lower side 14 on the side 12 side of the window glass 10 has a widened shape, the paint is smeared on the lower side 14 near the side 12. In order not to occur, application | coating of the coating liquid in process (ii-1) starts from the position as close to the lower side 14 as possible.

  Similarly, at the end position of the relative movement between the window glass 10 and the nozzle 20 in the step (ii-3), that is, the position at which application of the application liquid is ended, the application liquid flows from the side 11 side of the concave surface 10a to the convex surface 10b. It is sufficient that the coating liquid can be applied while suppressing the above.

As the coating method of the coating solution in the coating step in the present invention, the method (i) is preferable because the film thicknesses on the side 11 side and the side 12 side of the coating formed on the concave surface 10a of the window glass 10 can be easily aligned. The reason why the method (i) makes it easier to align the film thicknesses on the side 11 side and the side 12 side is as follows.
Since the coating liquid applied to the concave surface 10a of the window glass 10 flows while volatile components such as organic solvents are volatilized in the air and the solid concentration is increased and concentrated, as shown in FIG. There is a tendency that the thickness of the coating liquid increases toward the lower side 14 of the concave surface 10a. Since the change in the thickness of the coating solution becomes more conspicuous as the distance through which the coating solution flows, in the window glass 10 in which the length of the side 11 is longer than the length of the side 12, the side of the side 11 is closer. However, the thickness of the coating liquid on the lower side 14 side tends to be thicker than the side 12 side. On the other hand, since the coating liquid flows down from the lower side 14 side of the window glass 10 as the time (coating time) that the window glass 10 is kept standing after applying the coating liquid is longer, the concave surface 10a The coating liquid on the lower side 14 side tends to be thin.
In the method (i), since the coating solution is applied to the longer side 11 side first, the coating solution applied to the side 11 side is applied more than the coating solution applied to the side 12 side. The time increases, and the amount that flows down from the lower side 14 increases. Therefore, according to the method (i), the side 11 side of the concave surface 10a has a longer distance for the coating liquid to flow than the side 12 side, so that the thickness of the coating liquid tends to increase, while the side 12 side Compared to the above, the coating time becomes longer and the amount of the coating liquid flowing down from the lower side 14 side increases, so the increase in the thickness of the coating liquid becomes smaller. Therefore, it is easy to balance the thicknesses of the side 11 side and the side 12 side lower side 14 side.

The shape of the nozzle 20 is not particularly limited, but is preferably a nozzle with a wider width of the discharged coating liquid, a composite nozzle in which a plurality of nozzles are arranged in parallel, and a slit nozzle having a wide slit-like discharge port. preferable. When the width of the coating liquid discharged from the nozzle 20 is widened, a time is generated in the time when the coating liquid is supplied to the same position of the concave surface 10a of the window glass 10. Therefore, in step (i-2) of method (i) or step (ii-2) of method (ii), liquid cracking occurs when the coating liquid previously supplied to concave surface 10a flows through concave surface 10a. Even so, it is expected that the liquid cracking is eliminated by the coating solution that is supplied later and flows to the same position. That is, by using nozzles such as the composite nozzle and the slit nozzle, the same effect as applying the coating liquid to the same portion multiple times using a single nozzle having a narrow discharge port width can be expected.
Further, when the coating liquid is ejected from the nozzle 20 with the same ejection amount, the wider one of the coating liquid ejected, such as the composite nozzle, the slit nozzle, etc., compared to a single nozzle having a narrow width, Since the linear velocity of the coating liquid to be discharged becomes slow, it is easy to suppress the coating liquid from surging around the convex surface 10b due to excessive force especially on the side 11 side and the side 12 side.

  In the coating step of the present invention, for example, when the coating liquid is applied to the window glass 10 having an angle α formed by the side 11 and the lower side 14 greater than 90 ° illustrated in FIG. 1, the vicinity of the side 11 of the concave surface 10a. When the coating liquid supplied to the lower edge a side of the non-application area A flows through the concave surface 10a to the lower side 14 side, there is a possibility that the coating liquid may wrap around from the side 11 to the convex surface 10b side of the window glass 10. Therefore, regardless of the method (i) or method (ii), the window glass 10 is held so that the straight line 1 perpendicular to the side 11 is horizontal, and the side 11 is It is preferable to apply the coating liquid in a state perpendicular to the above. Thereby, on the side 11 side of the window glass 10, it becomes easy to suppress the coating liquid applied to the concave surface 10a from flowing from the side 11 to the convex surface 10b.

  The coating liquid used in the present invention may be any coating liquid that can form a film having necessary functions on the surface of the window glass 10 by the coating process and the drying process of the present invention. Known coating liquids such as a coating liquid for forming, a coating liquid for forming an antifogging film, and a coating liquid for forming a water repellent film can be used. As the film thickness increases, the problem of appearance quality is likely to occur, so that the effects of the manufacturing method of the present invention are easily obtained. Accordingly, a coating solution for forming an ultraviolet absorbing film, a coating solution for forming an infrared absorbing film, and a coating solution for forming an antifogging film, which require a relatively large film thickness, are preferred.

Drying process:
In the drying step in the production method of the present invention, volatile components such as an organic solvent contained in the coating liquid are removed by evaporation to be dried. A drying process is not specifically limited, A well-known drying process is employable. As a drying process in the present invention, for example, by temporarily placing the window glass 10 coated with the coating liquid for a certain period of time, a temporary drying process of temporarily drying the coating liquid coated on the concave surface 10a, and a window glass coated with the coating liquid The process which has this drying process which heats 10 and dries a coating liquid completely is mentioned.

In the main drying step, the window glass 10 coated with the coating liquid is heated to evaporate and remove volatile components such as an organic solvent contained in the coating liquid and dry to form a coating film.
The method of heating the window glass 10 coated with the coating liquid is not particularly limited, and examples thereof include a method of heating the window glass 10 coated with the coating liquid on a conveyor and sending it into a heating furnace. It is done. When placing the coating on the conveyor with the concave surface facing down in the main drying process, if the coating is present up to the upper edge of the window glass, the coating on the upper edge of the window glass will contact the heated furnace conveyor, The appearance problem of whitening occurs. On the other hand, according to the manufacturing method of the present invention, since the coating does not exist up to the upper side 13 end of the window glass 10, such an appearance problem does not occur.

  According to the manufacturing method of the present invention described above, by adopting the method (i) or the method (ii) in the coating step, the coating liquid is stabilized on the glass surface of the window glass by suppressing the smear of the coating liquid. High-quality automotive window glass with a coating can be obtained.

Moreover, according to the manufacturing method of this invention, even if it opens and closes the window of a motor vehicle door repeatedly, the film with a film by which the film is hard to be damaged and the deterioration of the appearance is suppressed is obtained.
In this invention, it was set as the aspect which provides the non-application area | region A which does not form a film in the upper side of a window glass. This is because the non-application area A in the window glass is hidden in the upper frame of the door with the window closed, so that the function of the film can be sufficiently obtained even if no film is formed in the area. By not forming the coating on the non-coated area A of the window glass, even if the window is repeatedly opened and closed, the area of the coating that rubs against the glass storage part of the upper frame of the door is small, and the coating is scratched and the appearance deteriorates. Can be suppressed.

In addition, the manufacturing method of this invention is not limited to the method mentioned above. For example, when the components in the coating film are cured to form a cured coating film, other processes such as a curing process may be performed after the drying process as necessary.
In the manufacturing method of the present invention, the coating solution may be applied to at least one surface of the window glass for automobiles. For example, when the window glass 10 is used, the coating solution is applied only to the convex surface 10b to form a film. Alternatively, the coating may be formed by applying the coating liquid on both the concave surface 10a and the convex surface 10b. When forming a film on both sides, it may form one side at a time, and may form both sides simultaneously.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited by the following description. Examples 1 and 2 are examples, and example 3 is a comparative example.
[Measurement of film thickness]
A part of the coating is scraped off from the glass substrate, and the level difference between the portion where the coating is present and the portion where the coating is not present is measured using a surface shape measuring device (DEKTAK3, manufactured by Nippon Vacuum Engineering Co., Ltd.), and the value is measured. It was.

[Example 1]
As the coating solution, 40.7 g of ethanol, 17.7 g of tetramethoxysilane, 6.0 g of 3-glycidoxypropyltrimethoxysilane, 7.6 g of 2,2 ′, 4,4′-tetrahydroxybenzophenone, A coating solution for forming an ultraviolet absorbing film prepared by mixing 18.3 g of pure water and 2.4 g of a 1% nitric acid aqueous solution and stirring for 1 hour was used.

Application process:
The ultraviolet absorbing film forming coating solution was applied to the concave surface 10a of the window glass 10 illustrated in FIG. 1 by the method (i). A single nozzle was used as the nozzle 20, and the window glass 10 and the nozzle 20 were moved relative to each other by moving the nozzle 20 while fixing the position of the window glass 10. The relative movement speed of the nozzle 20, the relative movement speed _{v 1} in step (i-1), and step a relative speed _{v 3} in (i-3) was 300 mm / sec. Relative moving velocity _{v 2} of the nozzle 20 in the step (i-2) was 60 mm / sec. The width d from the upper side 13 of the non-application area A was 15 mm.
In the coating step, the coating solution could be applied without any coating failure and suppressing liquid cracking. Moreover, there was no wraparound of the coating liquid to the convex surface 10b.

Drying process:
The window glass 10 coated with the coating solution is held with the concave surface 10a facing downward, and then placed on the conveyor with the concave surface 10a facing downward, and an ultraviolet absorbing film is formed on the concave surface 10a of the feed window glass 10 to the heating furnace. . About the obtained window glass for motor vehicles with a film, as shown in FIG. 5, the film thickness in point AC of the film formed on the concave surface 10a was measured.
The film thickness at each point is 1.55 μm for point a, 2.74 μm for point a, 3.92 μm for point c, 1.60 μm for point d, 2.82 μm for point o, and 3.84 μm for point f. The spot was 1.90 μm and the spot was 4.02 μm.

[Example 2]
An ultraviolet absorbing film was formed on the concave surface 10a of the window glass 10 in the same manner as in Example 1 except that the coating liquid was applied by the method (ii) in the coating step. Relative moving speed of the nozzle 20, the step (ii-1) the relative moving speed _{v 4} in, and step the relative movement velocity _{v 6} in (ii-3) was 300 mm / sec. Relative moving velocity _{v 5} of the nozzle 20 in the step (ii-2) was 50 mm / sec. In the coating process, the coating liquid could be applied without any coating failure and suppressing liquid cracking. Moreover, there was no wraparound of the coating liquid to the convex surface 10b.
About the obtained window glass for motor vehicles with a film, as shown in FIG. 5, the film thickness in point AC of the film formed on the concave surface 10a was measured.
The film thickness at each point is 1.47 μm for point a, 3.01 μm for point a, 4.98 μm for point c, 1.48 μm for point d, 2.81 μm for point o, and 3.92 μm for point f. The spot was 1.44 μm and the spot was 3.05 μm.

[Example 3]
In the application step, the concave surface 10a of the window glass 10 is the same as in Example 1 except that the step (i-1) and the step (i-3) are not performed and the coating solution is applied only in the step (i-2). An ultraviolet absorbing film was formed thereon. In the coating process, the coating liquid wraps around the convex surface 10b where the coating liquid is not applied on the side 11 side of the concave surface 10a, and the coating on the side 12 side is leaked.

DESCRIPTION OF SYMBOLS 10 Window glass 10a Concave surface 10b Convex surface 11, 12 Side 13 Upper side 14 Lower side 20 Nozzle 31 Coating liquid A Non-application area B Application area L Belt line a Lower edge of non-application area

Claims (4)

The window glass is held with the upper side of the window glass of the openable / closable window of the automobile standing up, and an area having a predetermined width from the upper side of the window glass on at least one surface of the window glass Application step of discharging and applying the coating liquid from the nozzle while relatively moving the window glass and the nozzle in the order of the following first to third steps, so that the non-application region,
A drying step of drying the coating solution applied in the coating step to form a film on the window glass;
I have a,
The vehicle window glass with a coating film , wherein the predetermined width is equal to or greater than a width of a region in which the window glass is stored in a glass storage portion of the upper frame of the door when the window is closed . Production method.
First step: A step of relatively moving the nozzle upward along the one side of the window glass to the lower edge of the non-application area.
Second step: A step of relatively moving the nozzle from the one side to the other side along the lower edge of the non-application region of the window glass.
Third step: A step of relatively moving the nozzle downward from the lower edge of the non-application region along the other side of the window glass. The lengths of the two side portions of the window glass are different from each other;
The coated automobile window according to claim 1, wherein the nozzle is relatively moved along a long side in the first step, and the nozzle is relatively moved along a short side in the third step. Glass manufacturing method.   The said window glass is curving, The manufacturing method of the window glass for motor vehicles with a film of Claim 1 or 2 which apply | coats the said coating liquid to the concave surface side of this window glass.   The coating film according to any one of claims 1 to 3, wherein the relative movement speed of the nozzle in the first step and the relative movement speed of the nozzle in the third step are faster than the relative movement speed of the nozzle in the second step. Of manufacturing automobile window glass.

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