JPS6272548A - Production of glass laminate - Google Patents

Abstract

PURPOSE:To obtain the titled glass laminate having excellent coated film performance, durability, etc., by baking a coated film on a glass sheet, superposing another glass sheet, bending the assembly, interposing a plastic laminating intermediate film and then integrally bonding the sheets by compression. CONSTITUTION:A paint 3 is printed on the specified part of one face of a glass sheet 1 and baked to form a coated film 4. The face having the coated film 4 is positioned at the upper part, another glass sheet 2 is superposed thereon and the assembly is placed on a bender 6. The assembly is introduced into a heating furnace, heated to the softening temp. of the glass sheets 1 and 2 and simultaneously bent by an own-weight bending method. The assembly is then annealed, a plastic laminating intermediate film 5 (e.g., a polyvinyl butyral film) is interposed between the bonding faces during bending and preliminary compression bonding is carried out. The sheets are integrally bonded by compression in an autoclave to obtain the desired glass laminate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing laminated glass, and particularly to a method for manufacturing laminated glass having a pIi film on the bonding surface of glass plates.

[Prior Art] Recently, laminated glass has tended to be widely used in automobile windshield shades as a windshield glass with excellent safety. Many things are used.

By the way, the bending process in such cases is generally performed by stacking flat outer glass and inner glass on top of each other, forming them into a bending mold, and heating them to the softening point temperature of the glass plate. A method of self-height oiling is used to consider the curved surface that follows the layers.

In addition, in such laminated glass, a colored coating film for blindfolding or a conductive coating film such as a bus bar or antenna conductor is added to a predetermined position on the bonding surface of either or both of the outer glass and inner glass. When it is necessary to apply various types of coatings, such as coatings, it is necessary to print coatings with the desired composition in an appropriate pattern to ensure adhesion to the glass plate surface and improve its durability. This is done by burning this. In that case, the paint is
Although it depends on the properties of the coating film to be fired, the main component used is usually a low-melting glass frit containing pigments, conductive metal powder, and a vehicle as an organic binder. Among these, the vehicle as an organic binder is mainly composed of organic polymer compounds such as ethyl cellulose, so it has the property of decomposing into H2O and CO2 and being burned out during heating for bending. , the burn-in generally does not remain in the subsequently fired coating.

However, when paint containing a vehicle is heated while being sandwiched between the joint surfaces of the outer glass and inner glass, sufficient oxygen is supplied to the entire paint because it is blocked by the glass plate. For this reason, it is not possible to
In such a case, where the bits remain undecomposed and baking becomes insufficient, - fired pp,
Reducing carbon is generated in the film itself, which reduces the metal oxides of the pigment components and prevents the desired performance from being achieved in terms of the color development of the colored coating film, the resistance value of the resistance heating heater wire, antenna conductor, etc. This will lead to undesirable results.

Therefore, in order to avoid such inconveniences, conventionally it has been necessary to form a coating film on the surface of the inner glass, which is the non-bonded surface of the laminated glass, on the inside of the vehicle.

On the other hand, with regard to the structure of installing a windshield on a car body, the flush mount method, which attempts to eliminate the height difference between the outside surface of the car body and the outside surface of the windshield as much as possible, has been adopted. The width of the molding placed between the two tends to be narrow. As in the past, when a relatively wide molding is used, it is difficult to hide the appearance defects such as bubbling, peeling, and clouding that tend to occur near the edges of laminated glass with the molding. However, due to the narrow width of modern malls, they are no longer able to fulfill their full potential. The above-mentioned coating film has attracted attention as a means to supplement such a distance.

From this point of view, a coating film, especially a colored coating film, is baked on the periphery of the bonding surface of the outer glass, and
Consideration was also given to making the problem of the h problem invisible from the outside of the vehicle. However, even in that case, if the bending process is performed through a conventional process, the above-mentioned problem of not being able to supply enough oxygen to the vehicle in the paint still remains.

A method for manufacturing laminated glass that involves the following steps may be considered as a way to overcome this bottleneck.

That is, first, with the inner glass facing down, the outer glass with paint printed on the L side is folded together with the inner glass, and then these are placed in the bending mold H to be heated and softened, and then The paint film is baked by baking the paint at the same time as the bending process. After slowly cooling the glass plate, when bonding the outer glass and the inner glass.

Bending is performed so that the ``time''-lower relationship is reversed so that the coated area is located one side inside the outer glass, and then the bonding surface is crimped with a plastic film interposed between them. By this process, laminated glass is manufactured.

[Problem to be solved by the invention] Laminated glass using the method described above! When building one, the paint can be heated in one minute.

It is possible to make the paint film baked on the car-inside surface of the outside glass panel to have a good baked-on state, color development, etc., with desired performance.

However, the pressure bonding between the outer glass and the inner glass through the plastic laminated interlayer film is not done through the mutual bonding surfaces during one bending process, but the outer glass and the inner glass are first swapped upside down. This will be done through other means.

Therefore, when crimping and bonding, the bonding surfaces cannot be in close contact with each other because the curved surfaces of the bonding surfaces cannot be made to match each other, and as a result, the manufactured laminated glass may become cloudy. There was a risk that the durability and strength would be inferior.

The purpose of the present invention is to solve the above-mentioned problems that the conventional methods had, to ensure that the coating film itself is baked on laminated glass having the coating film on the bonding surface, and to improve its color development and resistance. In addition to fully bringing out the desired performance such as value, the bonding surfaces of the outer glass and inner glass are crimped to ensure a sufficient fit, so the durability and strength of the laminated glass itself will not deteriorate. An object of the present invention is to provide a method for manufacturing laminated glass.

[Means for Solving the Problems] In order to achieve this object, the present invention has the following configuration.

That is, in the present invention, a coating film is preliminarily baked on a glass plate by baking a paint printed on a predetermined portion of one side of the glass plate, and the surface with the coating film is positioned on the L side of the glass plate.

This glass plate 1- is stacked with another glass plate and bent at the same time, and after the bending process is completed, a plastic laminated interlayer film is interposed between the bonded surfaces of the glass plates. Its structural feature is that it is integrally crimped and joined.

[Sakukawa] Therefore, according to the present invention, baking of the paint film on the glass plate can be carried out by exposing the paint film partially to the air and heating it at the required temperature. Baking is reliable, and the desired performance of the coating film can be fully brought out. In addition, the glass plates can be bonded together by pressure bonding by using the surface with the coating film as the bonding surface on the outer glass side, and making sure that the bonding surfaces are in close contact with each other for a sufficient fit, resulting in improved durability and strength. It is possible to manufacture laminated glass with excellent properties.

[Example] Drawings (A) to (F) are process diagrams showing an example of the method for manufacturing laminated glass according to the present invention, and the following description will be made with reference to these process diagrams.

Step (A): On one bent flat glass plate l, paint 3 is printed in a predetermined pattern on a predetermined area on one side by a method such as screen printing. The paint to be used depends on its function and purpose, such as whether the fired paint film 4 is a colored paint film used for blindfolding or improving aesthetics, or a conductive paint film for bus bars, antenna conductors, etc. The compositional components are different depending on the difference h<-F *
S - l-frll-Rōichisho fB Sako e -
Any material may be used as long as the coating film 4 can be baked by applying F hnm l-, di. For example, the main component is a low melting point glass frit, and a pigment or conductive metal powder and an organic binder are added to this as a main component. A paste-like product mixed with vehicle kasa is used.

The glass plate 1 on which the paint 3 is printed is kept at a temperature of about 50 to 100° C. for a predetermined period of time in order to promote evaporation of harmful organic components in the paint 3. The glass plate 1 after drying is carried into a heating furnace by a horizontal conveyance stage such as a roller or a conveyor, and is subjected to heat treatment at a required temperature to bake the paint 3 and bake the coating film 4. The heating in this case is lower than the softening point temperature of the glass plate 1 used.

Moreover, it is carried out under a temperature range higher than a predetermined temperature, and in the case of soda lime silicate glass plates, it is usually around 350°C to around 700°C, preferably 4°C.
The heating is carried out by maintaining a temperature in the range of 00° C. to 680° C., more preferably in the temperature range at which the glass plate does not warp due to heating, that is, in the range of 500° C. to 650° C., for a certain period of time.

If the temperature during heating is lower than the temperature listed in L, the combustion of the vehicle will be insufficient, and the coating film 4 may peel off due to reheating during the bending process described below, or the pigment may develop poor color, or the desired resistance may not be achieved. This may cause inconveniences such as not being able to obtain a value. Furthermore, if the temperature is higher than the above, the glass plate l will soften and cause undesirable deformation, dot-like shapes, and optical distortion, and these optical defects cannot be resolved even by heating during bending. After the glass plate 1 is heated in this way, it is sufficiently slowly cooled to prevent thermal cracking, and in some cases, a rapid cooling treatment is performed to strengthen the glass plate.

Step (B): The glass plate 1 after being slowly cooled is placed with the side with the coating film 4 facing up, and the other glass plate 2 is placed next to the glass plate 1.
Overlap. The other glass plate 2 in this case may have the coating film 4 baked in advance in the same manner as the glass plate 1, or may not have the coating film 4. When the glass plate 2 is
Place the surface with the coating 1 and 4 on the joining surface and align them. When both of the glass plates 1 and 2 have a coating v4, 1. For example, the coating 4 of the glass plate l located below is a colored coating fired on the periphery of the glass plate l, and The coating 1124 on the glass plate 2 located can also be a conductive coating film fired in an appropriate pattern, such as a bus bar or an antenna conductor.

Before joining the glass plates 1 and 2 together, it is desirable to wash them with water or the like in advance to prevent dust or foreign matter from adhering to the joint surfaces, and after washing, air dry or heat dry. It is preferable to do this.

Step (C): Glass plates 1 stacked in this way
．． 2 is placed on a bending mold 61 having a desired curved surface and transported into a heating furnace.

In addition, when stacking the glass plates 1 and 2 phases 1,
Bending [to facilitate subsequent separation.

Usually, a mold release agent in the form of a fine powder made of soda, sodium sulfate, gelite, alumina, magnesium oxide, etc. is sprayed on the joint surface as it is, or mixed with a solvent and sprayed. is preferred.

Step (D): The glass plate 2 carried into the heating furnace is
It is heated to its softening point temperature (for example, 550 to 700° C.), and simultaneously bent 1 by the self-weight bending method so as to follow the curved surface of the bending die 6 placed thereon. By heating during this bending process, the coating film 4 that has been previously fired on the glass plate 1 or the glass plate 1.2 can be further sufficiently baked, and furthermore, the coloring gloss and resistance value can be improved.

It is only possible to fully bring out the intended performance of the coating film 4.

Step (E): Glass plate 1 that has been bent.

Step 2 is to perform sufficient slow cooling so as not to leave any optical distortion.

After the glass plates 1 and 2 are sufficiently washed after being slowly cooled, they remain in the overlapping state at the time of the first bending process, that is, a plastic laminated interlayer film made of polyvinyl butyral or the like is formed between the joint surfaces during the bending process. Insert 5.

Step (F): After sandwiching the plastic laminated interlayer film 5 between the glass plates 1.2, the parts of the plastic laminated interlayer film 5 protruding from the peripheral end surface of the glass plate 1.2 are removed.
Trim it.

Preliminary pressure bonding is performed, and then main pressure bonding is performed in an autoclave tank to produce laminated glass.

Since the laminated glass according to the present invention is manufactured through such a process, the glass plate l or each glass plate l of the coating film 4 to be fired.

When the coating film 4 is a colored coating film, it can be colored with a minute gloss and prevent the fading phenomenon from occurring, and the coating film 4 is electrically conductive. When the coating film is a polyurethane coating, it is possible to bring out the resistance value etc. so that it has the desired performance.

In addition, when the coating film 4 fired on the bonding surface on the inside of the car of the glass plate l that becomes the exterior glass is a colored coating film, appearance defects such as bubbling and clouding that tend to occur around the edges of the laminated glass may occur. This makes it possible to manufacture laminated glass that is well suited to the trend toward narrower moldings that accompanies the flush mount construction method, such as being able to effectively hide UV rays and protecting sealants that are sensitive to UV rays.

Furthermore, the bonding surfaces between the glass plates 1.2 are the same as the bonding surfaces during bending, and therefore both bonding surfaces can be reliably brought into close contact during pressure bonding, so that the bonding surfaces do not become cloudy. The laminated glass can be reliably sealed and has excellent durability and strength.

[Effects of the Invention] As explained above, according to the method of the present invention, at least one of the glass plates serving as the outer glass plate is sufficiently baked at a predetermined position on the inner surface thereof, and has its properties such as color development and resistance value. It is possible to bake a coating film that fully brings out the desired performance, and since the bending process is performed while the joints are in an overlapping state, the curved surfaces of the joint surfaces can be made to match, so crimping is possible. The joint surfaces of the glass plate assembly W can be brought into close contact and sufficiently fit during joining, and it has excellent durability and strength, and has a flush mount 1.
A laminated glass can be produced which can also be suitably used in the process.

[Brief explanation of drawings]

The drawings are process diagrams showing one embodiment of the method for manufacturing laminated glass according to the present invention. 1.2@...Glass plate, 3...Paint. 4... Paint film. 5.--Plasti-7 interlayer film, 6.Bending mold agent Kenji Ryuko: Kaya 41' Toku:-Niko, engraving of the t- drawing (no change in content) Puncture 1 drawing tB+ Procedure Amendment (sha) March 2ζ, 1986

Claims (1)

[Scope of Claims] 1. A coating film is baked in advance by baking a paint printed on a predetermined portion of one side of the glass plate, and
This glass plate is placed with the surface with the coating on the top surface, and another glass plate is stacked on top of this glass plate and bent at the same time. 1. A method for manufacturing laminated glass, which comprises interposing a plastic laminated interlayer film between the bonding surfaces to integrally bond them by pressure bonding. 2. The laminated glass according to claim 1, wherein the firing temperature for baking the paint to form a coating film is lower than the softening point temperature of the glass plate and is in the range of 350°C or higher. Production method. 3. The method for manufacturing laminated glass according to claim 1, wherein the coating material is mainly composed of a low-melting glass frit, and contains a pigment or conductive metal powder, and a vehicle.