JP2002012024A - Window glass for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide window glass for a vehicle of fine appearance without cloudiness at the end face, dispensing with complicated chamfering treatment. SOLUTION: A transparent covering layer 3 formed of a sintered body containing glass frit is formed at an end face 1c of a glass pane 1 to obtain the window glass for the vehicle with the end face of fine appearance with reduced cloudiness, without applying complicated chamfering treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window glass for a vehicle such as an automobile.

[0002]

2. Description of the Related Art Windows of vehicles such as automobiles are usually made of glass plates. BACKGROUND ART A glass sheet for a vehicle window is used after a large-sized sheet glass called a base sheet is cut into a predetermined shape and then subjected to various treatments. One of various processes is a chamfering process of an end surface of a glass plate cut into a predetermined shape. The end surface (cut surface) of the glass plate immediately after being cut is in a state in which fine cracks and irregularities are present in the surface portion of the end surface, and the helicopter portion of the end surface is sharp. Therefore, the cut surface is smoothed by chamfering the end surface to smooth out fine cracks, irregularities, and sharp portions.

[0003] The chamfering process is a chamfering wheel (hereinafter simply referred to as "wheel") in which diamond abrasive grains are embedded.
Is used to grind the end face. Therefore, the end face after the chamfering process has a slightly cloudy appearance.

[0004]

On the other hand, as a recent automobile window design, there are many designs in which an end face of a glass plate is exposed. In addition, in a sliding window assembled to an automobile door, an upper end surface of a glass plate is exposed when the window is open. When the end surface of the glass plate is exposed in the state where the glass plate is assembled in the automobile, the opaque appearance impairs the transparency of the glass plate.

[0005] Further, a glass sheet for an automobile window fixed to the vehicle body (not to slide) is generally bonded and fixed to the vehicle body via an adhesive at the periphery of the glass sheet. In this case, a fired body of a dark ceramic paste for hiding the adhesive from the outside of the vehicle is provided on the periphery of the glass plate. In addition, a colored transparent glass plate may be used for a rear window of an automobile in recent years. As described above, the vicinity of the end surface of the glass plate for a vehicle window is often colored. When the vicinity of the end face of the glass plate is colored, cloudiness of the end face of the glass plate is emphasized.

In order to reduce the clouding of the end face, a special chamfering process called a mirror chamfering process may be considered. The mirror chamfering treatment is to grind the end surface of the glass plate by using a fine abrasive wheel. However,
If the chamfering process is performed only with wheels having fine abrasive grains, a large amount of time is required for the chamfering process. Therefore, the mirror chamfering process is usually performed by first performing a rough chamfering process with a coarse abrasive wheel and gradually changing to a finer abrasive wheel.

As described above, the mirror beveling process requires a lot of time and a lot of man-hours. For this reason, the mirror chamfering process is not an effective means for improving the appearance of the end face of the glass plate.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a window glass for a vehicle having a high productivity and an improved appearance of an end face while suppressing complicated work. It is in.

[0009]

In order to achieve the above-mentioned object, the present invention provides a vehicle window glass comprising a glass plate having a predetermined shape having an inner side surface, an outer side surface, and an end surface. A window glass for a vehicle, wherein a transparent coating layer is formed on at least one end face.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the vehicle window glass of the present invention, and FIG. 2 is an enlarged sectional view of a main part of an end portion of the vehicle window glass of FIG. The vehicle window glass 10 of the present embodiment has a vehicle interior side surface 1 b at a peripheral portion of the glass plate 1.
And a transparent coating layer 3 provided on the end face 1 c of the glass plate 1. Note that reference numeral 1a indicates a vehicle outer side surface of the glass plate 1.

In FIG. 2, the illustration of the concealing layer is omitted, and the relationship between the transparent covering layer 3 and the end face 1c is emphasized. On the end surface 1c of the glass plate 1, there is a fine concave portion 1d formed by a rough chamfering process using a wheel with coarse abrasive grains.
The end face 1c is covered with the transparent covering layer 3 together with the concave portion 1d.

In this way, the unevenness of the end face 1c is
And the end surface of the vehicle window glass 10 is smoothed. By smoothing the end surface of the vehicle window glass 10, light scattering on this end surface can be suppressed, and the end surface is prevented from becoming cloudy. In particular, by using a material having a refractive index that hardly differs from the refractive index of the glass plate 1 as a material for forming the transparent coating layer 3, the appearance of the end portion of the vehicle window glass is further improved.

It is preferable that the average surface roughness of the transparent coating layer from which such a good appearance is obtained is 1.0 μm or less. The average surface roughness is a value obtained by averaging all values measured by a surface roughness meter on the surface of the transparent coating layer at a line in the thickness direction of the glass plate at the center position of each side of the glass plate. is there.

The inner side surface 1b at the periphery of the glass plate 1
As the concealing layer 2 provided in the above, a fired body of a dark ceramic paste can be exemplified. The dark ceramic paste is a glass paste containing a glass frit, which can be generally used by adding a suitable vehicle to a low-melting glass powder, an inorganic filler, and a pigment and kneading them.

The fired body of the dark ceramic paste is obtained by firing a dark ceramic paste printed on the periphery of a glass plate by screen printing or the like. Normally, glass sheets for vehicle windows are subjected to bending and strengthening treatments.
The printed dark ceramic paste is fired when the glass plate is heated in the bending and strengthening process of the glass plate.

Transparent coating layer 3 covering end surface 1c of glass plate 1
As a fired body of a glass paste containing a glass frit (hereinafter simply referred to as “glass paste”), a silica layer,
An example is a transparent resin layer. The glass paste is a commonly used one obtained by adding a suitable vehicle to a low-melting glass powder and an inorganic filler and kneading them. The silica layer can be formed by, for example, an ultraviolet or infrared cured product or a thermosetting product of an organic or inorganic silicon compound capable of forming silica, film formation by a plasma CVD process, or the like. The fired body of the glass paste and the silica layer are layers of a transparent inorganic substance. From the viewpoint of good adhesion with the end face of the glass plate,
The transparent coating layer is preferably a layer of a transparent inorganic substance.

The case where a fired body of a glass paste is used as the transparent coating layer will be described in more detail. The glass paste is applied to the end face of the glass plate by an appropriate means such as a brush, a roller, a squeegee, a paste extrusion die, and a spray. Thereafter, it is fired at the time of heating the glass plate in the bending and strengthening process of the glass plate described above. It is also possible to add an ultraviolet curing agent to the glass paste, irradiate ultraviolet rays after application to the end surface of the glass plate, and temporarily cure the glass paste before firing.

As described above, the glass paste as the material of the transparent coating layer can be fired in the same step as the firing of the dark ceramic paste. Moreover, it is easy to adjust the refractive index of the fired body of the glass paste to a value substantially equal to the refractive index of the glass plate. Therefore, it is preferable to form the transparent coating layer from a fired body of a glass paste.

Further, it is preferable to use a material similar to the dark ceramic paste as a material of the transparent coating layer. That is, as the glass paste that is the material of the transparent coating layer, a paste obtained by removing the pigment from the dark ceramic paste can be exemplified. In this way, the dark ceramic paste is printed on the periphery of the glass plate, and after the glass paste is applied to the end surface of the glass plate, the concealing layer and the transparent coating layer are formed by a bending and strengthening process of the glass plate. Can be formed in each part.

In this case, the difference between the glass paste and the dark ceramic paste is mainly the presence or absence of a pigment.
There is no significant difference between the two firing conditions. Therefore, it is preferable to use, as the glass paste that is the material of the transparent coating layer, a material obtained by removing the pigment from the dark ceramic paste.

Next, the case where a silica layer is used as the transparent coating layer will be described. The silica layer can be formed, for example, as follows. First, an organic or inorganic silicon compound capable of forming silica is formed into a liquid coating solution using an appropriate solvent. This coating liquid is applied to the end face of the glass plate by an appropriate means such as brush, roller, spray or the like. After that, the coating liquid is cured by heating or irradiation with ultraviolet rays to form a silica layer on the end surface of the glass plate. The silicon compound includes various compounds for forming a silica layer, and examples thereof include polysilazane.

The case where a transparent resin layer is used as the transparent coating layer will be described. In this case, a transparent resin layer forming step is added after the bending / strengthening step of the glass plate. This step includes, for example, the following steps. The softened transparent resin material is extruded with an extrusion die or the like on the end face of the glass plate which has been subjected to the primer treatment as needed, and a transparent resin material layer is formed on the end face of the glass plate. After that, a curing process according to the type of the transparent resin material, such as an ultraviolet ray or near infrared ray irradiation treatment, a heat treatment, or the like, is performed to form a transparent resin layer on the end surface of the glass plate. In addition, as a transparent resin material, an ultraviolet curable urethane acrylate resin or the like can be exemplified.

In the above example, the transparent coating layer is provided on the end face of the chamfered glass plate. The transparent coating layer in the present invention may be provided on the end face of the glass plate in a state of being cut without being chamfered. That is, a smooth end face can be obtained by forming a transparent coating layer on the end face of the glass plate in a state of being cut by the above-described various materials and methods, and covering the unevenness of the cut face and the sharp helicopter portion.

Before the formation of the transparent coating layer, the end face of the glass plate should be removed by making the transparent coating layer uniform and improving the appearance of the end face by making the unevenness of the cut surface uniform to some extent. Next, it is preferable to perform chamfering. In this case, a chamfering process is performed between the cutting process and the transparent coating layer forming process.

The transparent coating layer may be formed on the entire periphery of the end face of the glass plate, or may be formed on a selected portion of the end face. For example, it is preferable to form a transparent coating layer on the entire periphery of the end face of a glass sheet for a rear window of an automobile where the entire periphery of the end face is exposed. In a sliding window mounted on an automobile door, since the upper edge of the glass plate is exposed when the window is open, it is preferable to form a transparent coating layer on at least the upper side when the vehicle is mounted.

In this case, since the lower side of the glass plate is not exposed outside the vehicle, it is preferable not to form a transparent coating layer from the viewpoint of simplification of the process. The sliding window slides with the side of the window being guided by the glass run channel. Therefore, it is preferable to form a transparent coating layer on the upper and side edges of the glass plate for a sliding window from the viewpoint of reducing sliding resistance and preventing deterioration of the run channel.

The maximum value of the thickness of the transparent coating layer is preferably 50 μm or less, particularly preferably 10 μm or less. In addition, the maximum value of the thickness of the transparent coating layer is a dimension indicated by reference numeral h in FIG.

[0028]

As described above, according to the vehicle window of the present invention, since the transparent covering layer is formed on the end surface of the glass plate, the vehicle window having a good appearance with reduced white turbidity is obtained. The window glass can be obtained without performing a complicated chamfering process.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a vehicle window glass of the present invention.

FIG. 2 is an enlarged sectional view of a main part of an end portion of the vehicle window glass of FIG. 1;

[Explanation of symbols]

 1: glass plate 2: hiding layer 3: transparent coating layer 10: window glass for vehicles

Claims (6)

[Claims] 1. A vehicle window glass comprising a glass plate having a predetermined shape having an inner side surface, an outer side surface and an end surface, wherein a transparent coating layer is formed on at least one end surface of the glass plate. Features window glass for vehicles. 2. The transparent coating layer having an average surface roughness of 1.0
The vehicle window glass according to claim 1, which has a thickness of not more than μm. 3. The maximum value of the thickness of the transparent coating layer is 50 μm.
The window glass for a vehicle according to claim 1 or 2, which is not more than m. 4. The vehicle window glass according to claim 1, wherein the glass plate is a glass plate for a sliding window, and the transparent coating layer is formed on at least an upper side in a vehicle assembled state. 5. The vehicle window glass according to claim 1, wherein the transparent coating layer is a layer of a transparent inorganic substance. 6. The window glass for a vehicle according to claim 5, wherein the transparent coating layer is made of a fired body of a glass paste containing a glass frit.