JP2016020204A - Window glass with coating for vehicle - Google Patents

Window glass with coating for vehicle Download PDF

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JP2016020204A
JP2016020204A JP2015154548A JP2015154548A JP2016020204A JP 2016020204 A JP2016020204 A JP 2016020204A JP 2015154548 A JP2015154548 A JP 2015154548A JP 2015154548 A JP2015154548 A JP 2015154548A JP 2016020204 A JP2016020204 A JP 2016020204A
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coating
window glass
coating liquid
glass
nozzle
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JP5867643B2 (en
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宏明 眞崎
Hiroaki Mazaki
宏明 眞崎
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AGC Inc
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Asahi Glass Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide window glass with coating for a vehicle being excellent in appearance quality and being capable of suppressing formation of a scratch on the coating provided on a glass surface even when opening/closing of the window glass is repeated.SOLUTION: Window glass with coating for a vehicle comprises: a glass plate surrounded with a curve-shaped upper side 13, a lower side 14 opposite to the upper side 13, a first lateral side 11 having an angle with respect to the lower side 14 greater than 90° and a second lateral side 12 having an angle with respect to the lower side 14 less than 90° and being shorter than the first lateral side 11; and first coating being brought into contact with the first lateral side 11 and the second lateral side 12 and being provided apart from the upper side 13 by at least a predetermined width. A region where the first coating is thickest is positioned at a position closer to the second lateral side 12 and the lower side 14 than a center of the glass plate.SELECTED DRAWING: Figure 3

Description

本発明は、被膜付き自動車用窓ガラスに関する。   The present invention relates to an automotive window glass with a coating.

自動車用ガラスは、通常、そのガラス面に、紫外線の遮蔽、赤外線の遮蔽、撥水性の付与、防曇性の付与等を目的とした被膜が設けられる。このような被膜付き自動車用ガラスの製造方法としては、フローコート法によりガラス板に塗布液を塗布し、乾燥することにより被膜を形成する方法が広く用いられている。   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.

例えば、特許文献１には、ガラス板を車両に組み付けた際に上部側になる辺（上辺）を上にして保持した状態で、該ガラス板の上部にノズルを用いて赤外線カット液を射出し、ガラス板の上部に射出された赤外線カット液が鉛直下向きに流れ落ちることによりガラス板上に赤外線カット液を塗布する方法が示されている。   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.

また、特許文献２には、ガラス板を車両に組み付けた際に下部側になる辺（下辺）を上にして保持した状態で、該ガラス板の上部にノズルを用いて赤外線カット液を射出し、ガラス板の上部に射出された赤外線カット液が鉛直下向きに流れ落ちることによりガラス板上に赤外線カット液を塗布する方法が示されている。   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.

特開２００７−１９１３２２号公報JP 2007-191322 A 特開２００７−１７６４４３号公報JP 2007-176443 A

しかし、自動車用ガラスのうち、特に自動車の開閉可能な窓ガラスの形状は、自動車の前部のドアと後部のドア、車種等によって異なっている。そのため、特許文献１の方法のように、ガラス板の上辺を上にして該上辺のみから塗布液を供給するだけでは、それら多様な形状の自動車用窓ガラスに対して塗布液を塗布する際、塗り斑を生じて外観品質が低下することがある。
また、数μｍ以上の膜厚の被膜が自動車用窓ガラスの面に設けられる場合、該自動車用窓ガラスの上辺近傍の部分の被膜は、窓ガラスを昇降させて繰り返し開閉する際、ドア上部のガラス収納部と擦れることで傷が付いて外観が悪くなることがある。さらに、湾曲した窓ガラスの凹面側に被膜を形成し、且つ被膜が窓ガラスの上辺端部まで存在する被膜付き窓ガラスを、凹面側を下にして加熱炉内に搬送する場合、窓ガラス上辺端部の被膜が加熱された加熱炉のコンベアに接触し、被膜が剥離したり、白化することがある。窓ガラス上辺は自動車に取り付け後も見える部分であり、このような剥離・白化現象は外観品質上大きな問題である。また、特許文献２の方法のように、ガラス板の下辺を上にして該下辺のみから塗布液を供給すると、ガラス板の上辺にまで塗布液が到達してしまうため、前記の外観品質上の問題が生じることがある。 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.

本発明は、外観品質に優れ、しかも繰り返し開閉してもガラス面に設けた被膜に傷が形成されることを抑制できる被膜付き自動車用窓ガラスの提供を目的とする。   An object of the present invention is to provide an automotive window glass with a coating that is excellent in appearance quality and can suppress the formation of scratches on the coating provided on the glass surface even when repeatedly opened and closed.

本発明の一態様に係る被膜付き自動車用窓ガラスは、曲線状となっている上辺と、前記上辺と対向する下辺と、前記下辺となす角度が９０°よりも大きい前記第一の側辺と、前記下辺となす角度が９０°よりも小さく、前記第一の側辺よりも短い第二の側辺とに囲まれたガラス板と、前記第一の側辺及び前記第二の側辺に接し、前記上辺と少なくとも所定の幅離れて設けられた第一の被膜とを備え、前記第一の被膜が最も厚くなる領域が、前記ガラス板の中央よりも前記第二の側辺および前記下辺に近い位置にあることを特徴とする。   The automotive windowpane with a film according to one aspect of the present invention includes an upper side that is curved, a lower side that faces the upper side, and the first side that is larger than 90 ° with respect to the lower side. A glass plate surrounded by a second side that is smaller than 90 ° and shorter than the first side, and the first side and the second side. In contact with the upper side and a first coating provided at least a predetermined width apart, and the region where the first coating is thickest is the second side and the lower side from the center of the glass plate. It is in the position close to.

本発明の被膜付き自動車用窓ガラスは、外観品質に優れ、しかも、繰り返し開閉してもガラス上辺部分の被膜に傷が形成されることを抑制できる。   The window glass for automobiles according to the present invention is excellent in appearance quality, and can suppress the formation of scratches on the film on the upper side of the glass even when repeatedly opened and closed.

本発明の製造方法に用いる自動車用窓ガラスの一例を示した正面図（Ａ）、およびその側面図（Ｂ）である。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). 本発明の製造方法における塗布工程を示した自動車用窓ガラスの側面図である。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. 本発明の製造方法における塗布工程を示した自動車用窓ガラスの側面図（Ａ）、（Ｂ）である。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). 本発明の製造方法における塗布工程を示した自動車用窓ガラスの側面図（Ａ）、（Ｂ）である。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). 実施例における被膜の膜厚の測定位置の説明図である。It is explanatory drawing of the measurement position of the film thickness of the film in an Example.

本発明の一態様の被膜付き自動車用窓ガラスの製造方法は、自動車の開閉可能な窓ガラスの少なくとも一方の面にフローコート法により塗布液を塗布する塗布工程と、該塗布工程にて塗布した塗布液を乾燥して被膜を形成する乾燥工程とを有する方法である。   In the method for producing a coated window glass for an automobile according to one aspect of the present invention, a coating solution is applied to at least one surface of an automobile window glass that can be opened and closed by a flow coating method, and coating is performed in the coating step. And a drying step of drying the coating solution to form a film.

自動車の開閉可能な窓ガラスの材質としては、特に限定されず、ソーダライムガラス、ホウ珪酸ガラス、無アルカリガラス、石英ガラス等の無機ガラス、およびポリカーボネート、アクリル等の有機ガラス等が挙げられる。   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.

自動車の開閉可能な窓ガラスとしては、自動車の前部または後部のドアに取り付けられる昇降して開閉可能な窓ガラスが挙げられる。本発明の方法によって製造した窓ガラスは、昇降開閉しても被膜の傷や剥離が生じにくく外観品質が良好である。窓ガラスの形状としては、種々のものがある。図１（Ａ）に、自動車の開閉可能な窓ガラスの一例として、自動車の前部のドアの開閉可能な窓ガラス１０の正面図を示す。
窓ガラス１０は、図１（Ａ）に示すように、一方の側辺１１（以下、単に「側辺１１」という。）が他方の側辺１２（以下、単に「側辺１２」という。）よりも長く、上辺１３が曲線状になっている形状である。また、窓ガラス１０の側辺１１と下辺１４とがなす角度αは９０°よりも大きくなっており、側辺１２と下辺１４とがなす角度βが９０°よりも小さくなっている。さらに、窓ガラス１０は、図１（Ｂ）に示すように、凹面１０ａが凹状、凸面１０ｂが凸状となるように湾曲している。窓ガラス１０は、側辺１２側を前、側辺１１側を後ろにして、凹面１０ａが車内側となるように自動車の前部のドアに取り付けられる。窓ガラス１０の上辺１３は、窓が閉じられた状態では、ドアの上部フレームのガラス収納部内に収納される。窓ガラス１０のベルトラインＬより下辺１４側の領域は、窓ガラスが閉じられた状態でもドア内に収納される。
以下、本発明の被膜付き自動車用窓ガラスの製造方法の一例として、窓ガラス１０の凹面１０ａ側に被膜を形成して被膜付き自動車用窓ガラスを得る方法について説明する。 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.

塗布工程：
塗布工程においては、図２に示すように、窓ガラス１０をその上辺１３を上にして立てた状態で保持する。そして、図１（Ａ）に示すように、窓ガラス１０の凹面１０ａにおける上辺１３から所定の幅ｄの領域が、塗布液を塗布しない非塗布領域Ａとなるように、凹面１０ａの非塗布領域Ａ以外の領域Ｂにフローコート法により塗布液を塗布する。ただし、下辺１４近傍をマスク部材によりマスクする場合には、該マスク領域には塗布液は塗布されない。 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.

前記幅ｄと、自動車のドアにおいて窓が閉じられた場合に、ドアの上部フレームのガラス収納部内に収納される領域の幅（以下、「ガラス収納幅」という。）との差は小さければよい。
前記幅ｄがガラス収納幅以上である場合、自動車のドアの窓を繰り返し開閉しても、領域Ｂはドアの上部フレームのガラス収納部に収納されなくなる。そのため、領域Ｂに設けられた被膜は前記ガラス収納部に擦れることがなく、窓を繰り返し開閉しても被膜に傷が付いて外観が悪くなることを抑制できる。また、被膜による機能が充分に得られやすい点から、前記幅ｄはガラス収納幅にできるだけ近いことが好ましい。
前記幅ｄがガラス収納幅以下である場合、被膜による機能が充分に得られる。また、領域Ｂに設けられた被膜がガラス収納部に擦れることを抑制するため、前記幅ｄはガラス収納幅にできるだけ近いことが好ましい。
被膜の傷付きを抑制するという目的では、前記幅ｄはガラス収納幅以上であることが好ましい。
具体的には、幅ｄとガラス収納幅の差は、０ｍｍ〜１０ｍｍであることが好ましく、０．５ｍｍ〜５ｍｍであることがより好ましく、１ｍｍ〜３ｍｍであることが特に好ましい。幅ｄとガラス収納幅の差とは、幅ｄがガラス収納幅よりも小さい場合、および幅ｄがガラス収納幅よりも大きい場合のいずれの場合も含む。また、前記幅ｄとガラス収納幅の差が０ｍｍとは、幅ｄとガラス収納幅が一致していることを意味する。 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.

窓ガラス１０を立てた状態で保持する方法は、特に限定されず、例えば、窓ガラス１０における塗布液を塗布しない凸面１０ｂに、吸盤を密着させて保持する方法等が挙げられる。   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.

窓ガラス１０の凹面１０ａにおける領域Ｂにノズル２０から塗布液を供給する方法としては、下記方法（ｉ）および方法（ii）が挙げられる。
方法（ｉ）：凹面１０ａの領域Ｂへの塗布液の塗布を、側辺１１側から開始し、側辺１２側で終了する方法。
方法（ii）：凹面１０ａの領域Ｂへの塗布液の塗布を、側辺１２側から開始し、側辺１１側で終了する方法。 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.

（方法（ｉ））
方法（ｉ）は、図３（Ａ）に示すように、窓ガラス１０とノズル２０を下記工程（ｉ−１）〜工程（ｉ−３）の順で相対移動させながら塗布液を吐出する方法である。
（ｉ−１）凹面１０ａの側辺１１に沿って、非塗布領域Ａの下縁ａまでノズル２０を上方向に相対移動させる第１工程。
（ｉ−２）凹面１０ａの非塗布領域Ａの下縁ａに沿って、側辺１１から側辺１２までノズル２０を相対移動させる第２工程。
（ｉ−３）凹面１０ａの側辺１２に沿って、非塗布領域Ａの下縁ａから下方向にノズル２０を相対移動させる第３工程。
方法（ｉ）における窓ガラス１０とノズル２０の相対移動は、窓ガラス１０の位置を固定してノズル２０を移動させてもよく、ノズル２０の位置を固定して窓ガラス１０を移動させてもよく、窓ガラス１０とノズル２０を互いに移動させてもよい。なかでも、塗布液の液割れ、塗布液の反対側のガラス面への回り込みを抑制しやすい点から、窓ガラス１０の位置を固定してノズル２０を移動させることが好ましい。 (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.

方法（ｉ）により塗布液を塗布すると、図４（Ａ）に示すように、各工程で供給された塗布液３１が自重によって凹面１０ａを下辺１４側へと流れていき、図４（Ｂ）に示すように、凹面１０ａにおける領域Ｂ全体に塗布液が塗布される。塗布液は、有機溶剤等の揮発成分が空気中に揮発し、固形分濃度が上昇して濃縮されながら凹面１０ａを流れていくため、凹面１０ａの下辺１４側の方が被膜が厚くなる。   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 liquid, 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. Therefore, the coating is thicker on the lower side 14 side of the concave surface 10a.

方法（ｉ）では、前述したように、工程（ｉ−１）〜工程（ｉ−３）の順に窓ガラス１０とノズル２０を相対移動させながら凹面１０ａの領域Ｂに塗布液を塗布することで、領域Ｂにおける塗布液の塗り斑を抑制でき、また、塗布液を塗布しない凸面１０ｂへの塗布液の回り込みを抑制できる。これらの要因は、以下のように考えられる。
凹面１０ａに供給された塗布液は、自重によって凹面１０ａを下辺１４に向かって流れていく。そのため、例えば、工程（ｉ−３）を行わず、工程（ｉ−２）のみで窓ガラス１０の凹面１０ａにおける領域Ｂに塗布液を塗布しようとすると、側辺１２は下辺に行くに従い裾広がりとなっているため、凹面１０ａの側辺１２近傍において、部分的に塗布液が塗布されない塗りもれが生じやすい。また、工程（ｉ−１）を行わず、工程（ｉ−２）のみで窓ガラス１０の凹面１０ａにおける領域Ｂに塗布液を塗布しようとすると、側辺１１は下辺に行くに従いインカーブしているので、窓ガラス１０の反対側のガラス面への塗布液の回り込みが生じやすい。
これに対し、方法（ｉ）では、工程（ｉ−１）において側辺１１に沿って塗布液が塗布された部分が、側辺１１の上部側に供給された塗布液が流れる際、塗布液の流れをガイドする道筋として作用するため、塗布液が側辺１１に沿って流れるので、窓ガラス１０の反対側のガラス面への塗布液の回り込みを防止できる。また工程（ｉ−３）において側辺１２に沿って塗布液を塗布することで、塗り漏れを防ぐことができる。
加えて、工程（ｉ−２）によって領域Ｂにおける非塗布領域Ａの下縁ａ近傍に供給された塗布液の下辺１４への流れは、予め工程（ｉ−１）で塗布された塗布液に沿って流れやすいので、よりスムーズになる。そのため、塗布液の流れが枝分かれすることによる液割れが抑制される。 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.

工程（ｉ−２）において、窓ガラス１０の凹面１０ａに供給された塗布液が下辺１４側に流れていく際、その流速が遅いと、塗布液の流れが枝分かれし、液割れを生じる場合がある。そのため、塗布液の流れが枝分かれして液割れするのを抑制する目的で、窓ガラス１０の水平面に対する傾斜角θ（図２）を９０°に近くすることが好ましい。窓ガラス１０の水平面に対する傾斜角θが９０°に近いほど、凹面１０ａに供給された塗布液が下辺１４側に流れる際の流速が速くなり、塗布液の液割れが生じ難くなる。
前記窓ガラス１０の水平面に対する傾斜角θとは、窓ガラス１０の非塗布面である凸面１０ｂの中央部分に接触する平面と、水平面とがなす角度を意味する。 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.

また、窓ガラス１０の凹面１０ａに対するノズル２０の角度φ（図４（Ａ））は、小さいほど好ましい。ノズル２０の前記角度φが小さいほど、ノズル２０から塗布液を吐出する方向が窓ガラス１０の凹面１０ａに対して平行に近づき、ノズル２０から吐出される塗布液の流速が凹面１０ａと接触した際に低下し難くなるため、塗布液の液割れが生じ難くなる。   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.

ノズル２０の相対移動速度は、塗布液の粘度、塗布液の吐出量、窓ガラス１０の高さ等によっても異なり、塗布液の液割れの抑制と、生産性を考慮して適宜決定すればよい。前記ノズル２０の相対移動速度とは、窓ガラス１０から見たノズル２０の移動速度である。
工程（ｉ−１）と工程（ｉ−３）における窓ガラス１０とノズル２０の相対移動のベクトルは、垂直方向が主成分であって、水平方向の成分は小さい。一方、工程（ｉ−２）における窓ガラス１０とノズル２０の相対移動のベクトルは水平方向が主成分である。液割れは水平方向の相対移動速度が大きい程発生しやすいので、工程（ｉ−１）におけるノズル２０の相対移動速度ｖ１と、工程（ｉ−２）におけるノズル２０の相対移動速度ｖ２と、工程（ｉ−３）におけるノズル２０の相対移動速度ｖ３との関係は、相対移動速度ｖ１、ｖ３が相対移動速度ｖ２よりも速いことが好ましい。
前記ノズル２０の相対移動速度ｖ１、ｖ２、ｖ３は、各々一定の速度であっても、途中で変化してもよいが、相対移動速度ｖ２は側辺１１側が側辺１２側よりも遅いことが好ましい。なぜなら、ノズル２０から凹面１０ａに供給された塗布液は、下辺１４に向かって流れる距離が長いほど、揮発成分の揮発によって固形分濃度が上昇するので下辺１４近傍の流速が低下する。窓ガラス１０は、側辺１２から側辺１１にいくにしたがって高さが高くなっているため、凹面１０ａの側辺１１側の方が塗布液の流れる距離が長い。そのため、工程（ｉ−２）におけるノズル２０の相対移動速度ｖ２は、ノズル２０が側辺１１に近いほど遅いことが好ましい。これにより、高さの高い側辺１１側においても、塗布液が下辺１４に向かって流れやすくなり、塗布液の流速の低下による液割れが生じ難くなる。 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.

また、方法（ｉ）では、工程（ｉ−１）における窓ガラス１０とノズル２０の相対移動の開始位置、すなわち塗布液の塗布を開始する位置は、凹面１０ａの側辺１１側から凸面１０ｂへと塗布液が回り込むのを抑制しつつ塗布液を塗布できる範囲であればよい。   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.

工程（ｉ−３）における窓ガラス１０とノズル２０の相対移動の終了位置、すなわち塗布液の塗布を終了する位置は、凹面１０ａの側辺１２近傍の下辺１４側に塗りもれを生じさせずに塗布液を塗布できる範囲であればよい。例えば、保持されている窓ガラス１０の側辺１２と下辺１４とがなす角度βが垂直に近ければ、工程（ｉ−３）において側辺１２側の高さ方向の中間位置で塗布液の塗布を終了しても、凹面１０ａの側辺１２近傍の下辺１４側に塗りもれを生じさせずに塗布液を塗布できる。一方、側辺１２と下辺１４とがなす角度βが小さく、窓ガラス１０の側辺１２側の下辺１４が大きく広がった形状である場合は、側辺１２近傍の下辺１４側で塗りもれが生じないように、工程（ｉ−３）における塗布液の塗布はできるだけ下辺１４に近い位置で終了する。   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.

（方法（ii））
方法（ii）は、図３（Ｂ）に示すように、窓ガラス１０とノズル２０を下記工程（ii−１）〜工程（ii−３）の順で相対移動させながら塗布液を吐出する方法である。
（ii−１）凹面１０ａの側辺１２に沿って、非塗布領域Ａの下縁ａまでノズル２０を上方向に相対移動させる第１工程。
（ii−２）凹面１０ａの非塗布領域Ａの下縁ａに沿って側辺１２から側辺１１までノズル２０を相対移動させる第２工程。
（ii−３）凹面１０ａの側辺１１に沿って非塗布領域Ａの下縁ａから下方向にノズル２０を相対移動させる第３工程。
方法（ii）における窓ガラス１０とノズル２０の相対移動は、方法（ｉ）と同様に、窓ガラス１０の位置を固定してノズル２０を移動させてもよく、ノズル２０の位置を固定して窓ガラス１０を移動させてもよく、窓ガラス１０とノズル２０を互いに移動させてもよい。なかでも、塗布液の液割れ、塗布液の反対側のガラス面への回り込みを抑制しやすい点から、窓ガラス１０の位置を固定してノズル２０を移動させることが好ましい。 (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.

窓ガラス１０の凹面１０ａに供給された塗布液は、方法（ｉ）と同様に、自重によって凹面１０ａを下辺１４側へと流れていき、凹面１０ａの領域Ｂ全体に塗布液が塗布される。
方法（ii）は、窓ガラス１０とノズル２０の相対移動を開始する位置と終了する位置、すなわち塗布液の塗布を開始する位置と終了する位置が反対である以外は、方法（ｉ）と同じ方法である。方法（ii）によれば、方法（ｉ）と同じ理由で塗布液の塗り斑を抑制できる。 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 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).

また、方法（ｉ）と同様に、塗布液の液割れや非塗布面である凸面１０ｂ側への回り込みを抑制しやすい点から、方法（ii）における窓ガラス１０の水平面に対する傾斜角θは、９０°に近くすることが好ましい。また、方法（ii）における窓ガラス１０の凹面１０ａに対するノズル２０の角度φは小さいほど好ましい。   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.

また、工程（ii−１）におけるノズル２０の相対移動速度ｖ４、工程（ii−２）におけるノズル２０の相対移動速度ｖ５、工程（ii−３）におけるノズル２０の相対移動速度ｖ６については、それぞれ方法（ｉ）におけるノズル２０の相対移動速度ｖ１、ｖ２、ｖ３と同様のことがいえる。
側辺１２近傍と側辺１１近傍は、工程（ii−１）と工程（ii−３）における窓ガラス１０とノズル２０の相対移動のベクトルは垂直方向が主成分であり、一方、工程（ii−２）における窓ガラス１０とノズル２０の相対移動のベクトルは水平方向が主成分である。液割れは水平方向の相対移動速度が大きい程発生しやすいので、工程（ii−１）におけるノズル２０の相対移動速度ｖ４と、工程（ii−２）におけるノズル２０の相対移動速度ｖ５と、工程（ii−３）におけるノズル２０の相対移動速度ｖ６との関係は、相対移動速度ｖ４、ｖ６が相対移動速度ｖ５よりも速いことが好ましい。
また、工程（ii−１）〜（ii−３）におけるノズル２０の相対移動速度ｖ４、ｖ５、ｖ６は、各々一定の速度であっても、途中で変化させてもよいが、相対移動速度ｖ５は側辺１１に近いほど遅いことが好ましい。これにより、高さの高い側辺１１側においても塗布液の液割れが生じ難くなる。ノズル２０の相対移動速度ｖ４と、相対移動速度ｖ６は上辺１３に近いほど遅いことが好ましい。 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.

方法（ii）では、工程（ii−１）における窓ガラス１０とノズル２０の相対移動の開始位置、すなわち塗布液の塗布を開始する位置は、凹面１０ａの側辺１２近傍の下辺１４側に塗りもれを生じさせずに塗布液を塗布できる範囲であればよい。保持されている窓ガラス１０の側辺１２と下辺１４とがなす角度βが垂直に近ければ、工程（ii−１）において側辺１２側の高さ方向の中間位置から塗布液の塗布を開始しても、凹面１０ａの側辺１２近傍の下辺１４側に塗りもれを生じさせずに塗布液を塗布できる。一方、側辺１２と下辺１４とがなす角度βが小さく、窓ガラス１０の側辺１２側の下辺１４が大きく広がった形状である場合は、側辺１２近傍の下辺１４側で塗りもれが生じないように、工程（ii−１）における塗布液の塗布はできるだけ下辺１４に近い位置から開始する。   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.

同様に、工程（ii−３）における窓ガラス１０とノズル２０の相対移動の終了位置、すなわち塗布液の塗布を終了する位置も、凹面１０ａの側辺１１側から凸面１０ｂへと塗布液が回り込むのを抑制しつつ塗布液を塗布できる範囲であればよい。   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.

本発明における塗布工程での塗布液の塗布方法は、窓ガラス１０の凹面１０ａに形成する被膜の側辺１１側と側辺１２側の膜厚を揃えやすい点から、方法（ｉ）が好ましい。方法（ｉ）の方が側辺１１側と側辺１２側の被膜の膜厚を揃えやすい理由は以下に示すとおりである。
窓ガラス１０の凹面１０ａに塗布された塗布液は、有機溶剤等の揮発成分が空気中に揮発し、固形分濃度が上昇して濃縮されながら流れるので、図４（Ｂ）に示すように、凹面１０ａの下辺１４側ほど塗布液の厚みが厚くなる傾向がある。この塗布液の厚みの変化は、塗布液が流れる距離が長いほど顕著であるため、側辺１２の長さに比べて側辺１１の長さが長い窓ガラス１０では、側辺１１側の方が側辺１２側よりも下辺１４側の塗布液の厚みが厚くなりやすい。一方、塗布液を塗布してから窓ガラス１０が立てられた状態で維持される時間（塗り置き時間）が長いほど、窓ガラス１０の下辺１４側から塗布液が流れ落ちていくため、凹面１０ａの下辺１４側の塗布液の厚みが薄くなる傾向がある。
方法（ｉ）では、長さがより長い側辺１１側に先に塗布液を塗布するので、側辺１１側に塗布された塗布液は側辺１２側に塗布された塗布液よりも塗り置き時間が長くなり、下辺１４側から流れ落ちる量が多くなる。そのため、方法（ｉ）によれば、凹面１０ａの側辺１１側は、側辺１２側に比べて塗布液が流れる距離が長いために塗布液の厚みが厚くなりやすい一方で、側辺１２側に比べて塗り置き時間が長くなって下辺１４側から流れ落ちる塗布液量が多くなるので、塗布液の厚みの増加が小さくなる。そのため、側辺１１側と側辺１２側の下辺１４側の厚みのバランスを取りやすい。 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.

ノズル２０の形状は、特に限定されないが、吐出される塗布液の幅がより広くなるノズルが好ましく、複数本のノズルが並列された複合ノズル、幅が広いスリット状の吐出口を有するスリットノズルが好ましい。ノズル２０から吐出される塗布液の幅が広くなると、窓ガラス１０の凹面１０ａの同じ位置に、塗布液が供給される時間に幅が生じる。そのため、方法（ｉ）の工程（ｉ−２）あるいは方法（ii）の工程（ii−２）において、凹面１０ａに先に供給された塗布液が凹面１０ａを流れていく際に液割れが生じたとしても、同じ位置に後から供給されて流れてくる塗布液によってその液割れが解消される効果が期待できる。つまり、前記複合ノズル、スリットノズル等のノズルを用いることで、吐出口の幅の狭い単一のノズルを用いて、同じ部分に複数回塗布液を塗布するのと同等の効果が期待できる。
また、ノズル２０から、同じ吐出量で塗布液を吐出する場合、前記複合ノズル、スリットノズル等のように吐出される塗布液の幅が広い方が、幅の狭い単一のノズルに比べて、吐出する塗布液の線速度が遅くなるため、特に側辺１１側と側辺１２側において塗布液が勢い余って凸面１０ｂに回り込んでしまうことを抑制しやすい。 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.

本発明の塗布工程では、例えば、図１に例示した、側辺１１と下辺１４とがなす角度αが９０°よりも大きい窓ガラス１０に塗布液を塗布する場合、凹面１０ａの側辺１１近傍の非塗布領域Ａの下縁ａ側に供給された塗布液が、凹面１０ａを下辺１４側に流れていく際に側辺１１から窓ガラス１０の凸面１０ｂ側に回り込んでしまうおそれがある。そのため、方法（ｉ）および方法（ii）のいずれの方法を採用する場合であっても、側辺１１に垂直な直線ｌが水平となるように窓ガラス１０を保持し、側辺１１を水平面に対して垂直にした状態で塗布液の塗布を行うことが好ましい。これにより、窓ガラス１０の側辺１１側において、凹面１０ａに塗布した塗布液が側辺１１側から凸面１０ｂ側に回りこむことを抑制することが容易になる。   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.

本発明に用いる塗布液は、窓ガラス１０の面に、本発明の塗布工程および乾燥工程によって必要な機能を有する被膜を形成できるものであればよく、紫外線吸収膜形成用塗布液、赤外線吸収膜形成用塗布液、防曇膜形成用塗布液、撥水膜形成用塗布液等の公知の塗布液が挙げられる。被膜の膜厚が大きくなるほど、外観品質の問題が生じやすくなるため、本発明の製造方法による効果が得られやすい。従って、比較的大きな膜厚が要求される、紫外線吸収膜形成用塗布液、赤外線吸収膜形成用塗布液および防曇膜形成用塗布液が好ましい。   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.

乾燥工程：
本発明の製造方法における乾燥工程では、塗布液に含まれている有機溶剤等の揮発成分を蒸発させて除去して乾燥する。乾燥工程は、特に限定されず、公知の乾燥工程を採用できる。本発明における乾燥工程としては、例えば、塗布液が塗布された窓ガラス１０を一定時間置くことで、凹面１０ａに塗布した塗布液を仮乾燥する仮乾燥工程と、塗布液が塗布された窓ガラス１０を加熱して塗布液を完全に乾燥させる本乾燥工程を有する工程が挙げられる。 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.

本乾燥工程では、塗布液が塗布された窓ガラス１０を加熱することにより、塗布液に含まれている有機溶剤等の揮発成分を蒸発させて除去し、乾燥させて被膜を形成する。
塗布液が塗布された窓ガラス１０を加熱する方法としては、特に限定されず、例えば、塗布液が塗布された窓ガラス１０をコンベア上に載せ、加熱炉内に送ることで加熱する方法が挙げられる。本乾燥工程で凹面を下向きにしてコンベア上に載せる場合、被膜が窓ガラスの上辺端部まで存在すると、窓ガラスの上辺端部の被膜が加熱された加熱炉のコンベアに接触し、塗膜が白化するという外観上の問題が生じる。一方、本発明の製造方法によれば、被膜が窓ガラス１０の上辺１３端部まで存在しないため、このような外観上の問題は生じない。 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.

以上説明した本発明の製造方法によれば、塗布工程において方法（ｉ）または方法（ii）を採用することで、塗布液の塗り斑を抑制して窓ガラスのガラス面に塗布液を安定して塗布できるので、高品質な被膜付き自動車用窓ガラスが得られる。   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.

また、本発明の製造方法によれば、自動車のドアの窓を繰り返し開閉しても被膜に傷が付きにくく外観の悪化が抑制された被膜付き自動車用窓ガラスが得られる。
本発明では、窓ガラスの上辺側に被膜を形成しない非塗布領域Ａを設ける態様とした。これは、窓ガラスにおける非塗布領域Ａは、窓を閉じた状態でドアの上部フレーム内に隠れるので、該領域に被膜が形成されていなくても被膜による機能は充分に得られるためである。窓ガラスの非塗布領域Ａに被膜を形成しないことで、窓を繰り返し開閉しても、ドアの上部フレームのガラス収納部分と擦れる被膜の領域が小さく、被膜に傷が付いて外観が悪化することを抑制できる。 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.

なお、本発明の製造方法は、前述した方法には限定されない。例えば、塗膜中の成分を硬化させて硬化塗膜とする場合等は、必要に応じて乾燥工程後に硬化工程等の他の工程を行ってもよい。
また、本発明の製造方法では、塗布液は自動車用窓ガラスの少なくとも一方の面に塗布すればよく、窓ガラス１０を例にすれば凸面１０ｂのみに塗布液を塗布して被膜を形成してもよく、凹面１０ａと凸面１０ｂの両方に塗布液を塗布して被膜を形成してもよい。両面に被膜を形成する際は、片面ずつ形成してもよく、両面同時に形成してもよい。 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.

以下、実施例及び比較例を示して本発明を詳細に説明する。ただし、本発明は以下の記載によっては限定されない。例１および例２は実施例であり、例３は比較例である。［被膜の膜厚の測定］
ガラス基板から被膜の一部を削り取り、被膜の存在する部分と被膜の存在しない部分の段差を表面形状測定装置（ＤＥＫＴＡＫ３、日本真空技術社製）を用いて測定し、その値を被膜の膜厚とした。 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.

［例１］
塗布液としては、エタノールの４０．７ｇ、テトラメトキシシラン１７．７ｇ、３−グリシドキシプロピルトリメトキシシランの６．０ｇ、２，２’，４，４’−テトラヒドロキシベンゾフェノンの７．６ｇ、純水１８．３ｇ、および１％硝酸水溶液の２．４ｇを混合し、一時間攪拌して調製した紫外線吸収膜形成用塗布液を用いた。 [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.

塗布工程：
前記紫外線吸収膜形成用塗布液を、方法（ｉ）により、図１に例示した窓ガラス１０の凹面１０ａに塗布した。ノズル２０としてシングルノズルを用い、窓ガラス１０の位置を固定してノズル２０を移動させることで、窓ガラス１０とノズル２０を相対移動させた。ノズル２０の相対移動速度は、工程（ｉ−１）における相対移動速度ｖ１、および工程（ｉ−３）における相対移動速度ｖ３を３００ｍｍ／秒とした。工程（ｉ−２）におけるノズル２０の相対移動速度ｖ２は６０ｍｍ／秒とした。また、非塗布領域Ａの上辺１３からの幅ｄは１５ｍｍとした。
該塗布工程では、塗りもれもなく、液割れを抑制して塗布液を塗布できた。また、凸面１０ｂへの塗布液の回り込みもなかった。 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.

乾燥工程：
塗布液を塗布した窓ガラス１０を、凹面１０ａを下向きにして保持し、その後凹面１０ａを下向きにしてコンベア上に載せ、加熱炉へと送り窓ガラス１０の凹面１０ａ上に紫外線吸収膜を形成した。得られた被膜付き自動車用窓ガラスについて、図５に示すように、凹面１０ａ上に形成した被膜の点ア〜クにおける膜厚を測定した。
各点における被膜の膜厚は、点アが１．５５μｍ、点イが２．７４μｍ、点ウが３．９２μｍ、点エが１．６０μｍ、点オが２．８２μｍ、点カが３．８４μｍ、点キが１．９０μｍ、点クが４．０２μｍであった。 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.

［例２］
塗布工程において方法（ii）により塗布液を塗布した以外は、例１と同様にして窓ガラス１０の凹面１０ａ上に紫外線吸収膜を形成した。ノズル２０の相対移動速度は、工程（ii−１）における相対移動速度ｖ４、および工程（ii−３）における相対移動速度ｖ６を３００ｍｍ／秒とした。工程（ii−２）におけるノズル２０の相対移動速度ｖ５は５０ｍｍ／秒とした。塗布工程では、塗りもれもなく、液割れを抑制して塗布液を塗布できた。また、凸面１０ｂへの塗布液の回り込みもなかった。
得られた被膜付き自動車用窓ガラスについて、図５に示すように、凹面１０ａ上に形成した被膜の点ア〜クにおける膜厚を測定した。
各点における被膜の膜厚は、点アが１．４７μｍ、点イが３．０１μｍ、点ウが４．９８μｍ、点エが１．４８μｍ、点オが２．８１μｍ、点カが３．９２μｍ、点キが１．４４μｍ、点クが３．０５μｍであった。 [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.

［例３］
塗布工程において、工程（ｉ−１）および工程（ｉ−３）を行わず、工程（ｉ−２）のみで塗布液を塗布した以外は、実施例１と同様にして窓ガラス１０の凹面１０ａ上に紫外線吸収膜を形成した。塗布工程では、凹面１０ａの側辺１１側において塗布液を塗布しない凸面１０ｂへの塗布液の回り込みが生じ、側辺１２側に塗りもれが生じた。 [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.

１０ 自動車用窓ガラス
１０ａ 凹面
１０ｂ 凸面
１１、１２ 側辺
１３ 上辺
１４ 下辺
２０ ノズル
３１ 塗布液
Ａ 非塗布領域
Ｂ 塗布領域
Ｌ ベルトライン
ａ 非塗布領域の下縁 DESCRIPTION OF SYMBOLS 10 Automotive 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

本発明の一態様に係る被膜付き自動車用窓ガラスは、曲線状となっている上辺と、前記上辺と対向する下辺と、前記下辺となす角度が９０°よりも大きい第一の側辺と、前記下辺となす角度が９０°よりも小さく、前記第一の側辺よりも短い第二の側辺とに囲まれたガラス板と、前記第一の側辺及び前記第二の側辺に接し、前記上辺と少なくとも所定の幅離れて設けられた第一の被膜とを備え、前記第一の被膜が最も厚くなる領域が、前記ガラス板の中央よりも前記第二の側辺および前記下辺に近い位置にあり、前記第一の被膜は前記ガラス板の反対側の面に回り込んで設けられていないことを特徴とする。 A coated window glass for an automobile according to one embodiment of the present invention includes a top side that has a curved, and the lower side of the upper side facing a first side edge has magnitude than the angle 90 ° formed between the lower side A glass plate surrounded by a second side that is smaller than 90 ° and shorter than the first side, and the first side and the second side. In contact with the upper side and a first coating provided at least a predetermined width apart, and the region where the first coating is thickest is the second side and the lower side from the center of the glass plate. Ri position near close to, the first coating is characterized by not provided goes around on the opposite side of the glass plate.

Claims (6)

曲線状となっている上辺と、前記上辺と対向する下辺と、前記下辺となす角度が９０°よりも大きい前記第一の側辺と、前記下辺となす角度が９０°よりも小さく、前記第一の側辺よりも短い第二の側辺とに囲まれたガラス板と、
前記第一の側辺及び前記第二の側辺に接し、前記上辺と少なくとも所定の幅離れて設けられた第一の被膜とを備え、
前記第一の被膜が最も厚くなる領域が、前記ガラス板の中央よりも前記第二の側辺および前記下辺に近い位置にあることを特徴とする被膜付き自動車用窓ガラス。 An angle formed between a curved upper side, a lower side facing the upper side, the first side that is larger than 90 ° and the lower side is smaller than 90 °, and the first side is smaller than 90 °, A glass plate surrounded by a second side shorter than one side;
The first coating provided in contact with the first side and the second side, and provided at least a predetermined width away from the upper side,
The window glass for automobiles with a coating film, wherein the region where the first coating film is thickest is located closer to the second side and the lower side than the center of the glass plate. 前記ガラス板は凹面を有するように湾曲しており、前記第一の被膜は前記ガラス板の凹面側に設けられていることを特徴とする請求項１に記載の被膜付き自動車用窓ガラス。   2. The automotive window glass with a coating according to claim 1, wherein the glass plate is curved so as to have a concave surface, and the first coating is provided on the concave surface side of the glass plate. 前記第一の被膜は、下辺側に近いほど厚い請求項１または２に記載の被膜付き自動車用窓ガラス。   The window glass for a vehicle with a coating according to claim 1, wherein the first coating is thicker toward a lower side. 前記第一の被膜は、紫外線吸収膜、赤外線吸収膜、防曇膜の少なくともいずれかであることを特徴とする請求項１〜３のいずれかに記載の被膜付き自動車用窓ガラス。   4. The automotive window glass with a coating according to claim 1, wherein the first coating is at least one of an ultraviolet absorbing film, an infrared absorbing film, and an antifogging film. 前記ガラス板の凹面に対向する凸面に前記第一の被膜よりも厚さが薄い第二の被膜が設けられていることを特徴とする請求項１〜４のいずれかに記載の被膜付き自動車用窓ガラス。   5. The automobile with a coating according to claim 1, wherein a second coating having a thickness smaller than that of the first coating is provided on a convex surface facing the concave surface of the glass plate. Window glass. 前記第二の被膜は、撥水膜であることを特徴とする請求項５に記載の被膜付き自動車用窓ガラス。 The automotive window glass with a coating according to claim 5, wherein the second coating is a water-repellent film.
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Publication number Priority date Publication date Assignee Title
JP2021020600A (en) * 2019-07-29 2021-02-18 日本板硝子株式会社 Window glass for automobile

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JPH09141188A (en) * 1995-11-22 1997-06-03 Central Glass Co Ltd Film formation
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JP2007176443A (en) * 2005-12-28 2007-07-12 Nippon Sheet Glass Co Ltd Vehicular window glass and manufacturing method thereof

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JPH09141188A (en) * 1995-11-22 1997-06-03 Central Glass Co Ltd Film formation
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JP2007176443A (en) * 2005-12-28 2007-07-12 Nippon Sheet Glass Co Ltd Vehicular window glass and manufacturing method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021020600A (en) * 2019-07-29 2021-02-18 日本板硝子株式会社 Window glass for automobile
JP7356838B2 (en) 2019-07-29 2023-10-05 日本板硝子株式会社 automotive window glass

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