JPH0321954Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to opalescent laminated glass used for lighting equipment and other building materials.

(Conventional technology) Conventionally, laminated glass, which is made by bonding multiple glass plates with a laminated film (intermediate layer between glass sheets made of synthetic resin), has high strength and impact resistance, and prevents fragments from scattering even if broken. It is widely used as a highly safe glass for window glass and building materials, and
Laminated glass with enhanced decorative properties is also produced by applying color to the laminated film or by interposing decorations in the laminated film.

Among these, milky white laminated glass, which exhibits a milky white color when light is transmitted through it, is in particular demand as a material for lighting equipment and window glass.

For example, as shown in FIG. 2A, this milky white laminated glass is made by bonding transparent laminated films 12 and 13 to both sides of a milky white polyester film 11,
Furthermore, there is a laminated glass a in which a plate glass 14 is bonded to a transparent laminated film 12 and a plate glass 15 is bonded to the other transparent laminated film 13, thereby combining the plate glasses 14 and 15.

Further, as shown in FIG. 2B, there is a milky white laminated glass b in which plate glasses 17 and 18 are combined via a milky white laminated film 16 in which a white pigment is dispersed in a resin.

Furthermore, as shown in FIG. 2C, there is a milky white laminated glass in which a transparent glass plate 18 and milky white glass are combined with a transparent laminated film 17 interposed therebetween.

(Problem to be solved by the invention) However, the opalescent laminated glass a shown in Figure 2A
Since this method consists of only a single sheet of milky-white polyester film interposed between laminated films, it has the disadvantage of low light transmittance (Ye≒25-40%).

Furthermore, although the opalescent laminated glass b shown in Figure 2 B has a high light transmittance (Ye≒50%), when light passes through the laminated glass b, it does not look opalescent but appears blue, resulting in poor design. . Furthermore, if a large amount of white pigment is mixed into the laminated film to make it whiter than the laminated film in order to make it milky white, there is a drawback that the light transmittance decreases.

Furthermore, regarding the opalescent laminated glass C shown in FIG. 2C, since most of the opalescent glass 19 used is imported, the cost is high, and the laminated glass is thick, which causes problems in terms of thickness.

(Means for solving the problem) In order to solve the above problem, the present invention first sets the total thickness of the milky white laminated film based on a predetermined transmittance, then divides the total thickness, In other words, by laminating a plurality of milky-white laminated films between glass plates with transparent films interposed therebetween, diffusion performance is improved while maintaining a predetermined transmittance.

(Function) By interposing a plurality of milky-white laminated films, the incident light is diffusely reflected and diffused by the milky-white laminated films while maintaining a high transmittance. Therefore, when light passes through the laminated glass, it becomes milky white.
Furthermore, as the number of milky-white laminated films increases, the light diffusion rate increases, resulting in a clearer milky white color.

(Example) An example of the present invention will be described below with reference to FIG.

Figure 1 shows milky white laminated glass 1 in which the present invention was implemented.
FIG.

The opalescent laminated glass 1 is made by laminating glass plates 5 and 6 through a laminate formed by laminating opalescent laminated films 2 and 3 and a transparent laminated film 4.

Here, the milky white laminated films 2 and 3 are made of, for example, polyvinyl butyral, and the laminated films 2 and 3 are made of, for example, polyvinyl butyral.
In order to impart white color to the polyvinyl butyral material, for example, fine powders of white fluorescent pigment, calcium carbonate, and white glass are kneaded into the raw material of polyvinyl butyral, and then a film is formed.

In addition, the milky white laminated films 2 and 3 have a film thickness of 20 to 50 μm.
The transmissivity (Ye) of this milky-white matching film itself is 60%.

Next, the transparent laminating film 4, like the milky white laminating films 2 and 3, is formed from, for example, polyvinyl butyral or the like as a raw material. If the raw material for this transparent laminated film 4 is the same as the raw material for the milky white laminated films 2 and 3, the adhesion to the milky white laminated films 2 and 3 will be stronger, and the strength and impact resistance of the milky white laminated glass 1 as a whole will be improved. It is desirable to increase safety and further increase safety in the event of breakage.

Moreover, this transparent laminated film 4 has a film thickness of 100~
Use 300μ.

As a method for manufacturing the milky white laminated glass 1, for example, white laminated films 2 and 4 are coated on both sides of the transparent laminated film 4.
In addition to the method of forming a laminate by laminating each of them and sandwiching the laminate between glass plates 5 and 6,
There is a method in which a white laminating film 2, a transparent laminating film 4, and a white laminating film 3 are sequentially laminated on the glass plate 5, and finally, a glass plate 6 is stacked on the surface of the white laminating film 3 and then processed.

Further, as a method for processing the opalescent laminated glass 1, for example, a pressure heating method using an autoclave, a reduced pressure heating method using a Dumilan vacuum system, a roll pressure method, etc. can be used.

In addition, in the white laminated glass 1 shown in FIG. 1, two white laminated films 2 and 3 are provided, but a larger number of white laminated films can be provided, and the greater the number, the more laminated the glass is. As a result of the diffused reflection of light passing through the glass, which increases the diffusivity, the color of the laminated glass can be made closer to milky white. However, in this case, in order to maintain high transmittance, as the number of white matching films increases,
It is necessary to reduce the thickness of the white laminating film and the transparent laminating film interposed between the white laminating films.

That is, for example, a milky white laminated glass made by laminating plate glasses with a single milky white laminated film with a thickness of 100μ interposed between them will look blue and not milky when light passes through it, but if the milky white laminated film is divided into two pieces. Milky laminated glass is formed by laminating milky laminated films each having a thickness of 50μ on both sides of a transparent laminated film having a thickness of 300μ, and then sandwiching the laminate and joining two sheets of glass together. The transmittance is the same as that of the laminated glass that holds the glass in between, but it appears milky white due to the large diffusion effect of the transmitted light.

(Effects of the invention) As explained above, according to the invention, a plurality of milky-white laminated films are provided between the glass plates with transparent laminated films interposed therebetween, allowing light to pass through while maintaining high transmittance. Because of its high diffusivity, it can be made into a beautiful milky-white laminated glass.

Therefore, especially when the opalescent laminated glass according to the present invention is used as a lighting equipment material, the shape of the light source is not visible from the outside of the lighting equipment due to the high light diffusion rate, and the design is extremely good.

Furthermore, depending on the thickness of the milky-white laminated film, it is easy to obtain a milky-white laminated film with arbitrary transmittance, so it can be used in a wide range of applications, and it is also easy to form a milky white laminated film. , the cost of opalescent laminated glass can also be significantly lowered.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a milky white laminated glass according to the present invention, and FIG. 2 is a conventional example of a milky white laminated glass. In the drawings, 1 is a milky white laminated glass, 2 and 3 are milky white laminated films, 4 is a transparent laminated film, and 5 and 6 are plate glasses.

Claims (1)

[Scope of utility model registration request] In a milky white laminated glass in which two glass plates are bonded via a milky white laminated film, a plurality of said milky white laminated films are provided, and the total thickness of these multiple milky white laminated films is based on a predetermined transmittance. A milky white laminated glass is further characterized in that a transparent laminated film is interposed between each milky white laminated film.