JPS63223601A - Curved mirror and its production - Google Patents

Abstract

PURPOSE:To permit mass production of curved mirrors with a simple stage by using a double-coated pressure-sensitive adhesive sheet to adhere a reflection sheet and glass sheet under an atmospheric pressure at an ordinary temp. CONSTITUTION:The curved mirror 11 is formed by joining the reflection sheet (glass mirror) 12 and the floating sheet glass 13 by the double-coated pressure- sensitive adhesive sheet 14 and has a prescribed curved surface. The sheet 12 is formed by coating a reflection film (silver film) on the glass sheet, coating a protective film (copper film) thereon, and further, coating a protective film (lining coating) thereon and has a function as a glass mirror. The thickness of the sheet 12 is specified in a 1.2-0.3mm range and the thickness of the glass 13 in a 2-8mm range. Pressure of 3-5kg/cm<2> per unit area of such laminate 21 is exerted to the laminate 21 at the time of passing the laminate between a pair of press rolls 22 and 23 by which the laminate is deaerated and adhered. The adhesion of the glass mirror and the floating glass sheet under the atmospheric pressure at the ordinary temp. is thereby permitted and the mass production of the mirrors is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a curved mirror having a high reflectance to solar radiation and a method for manufacturing the same.

(Prior Art) Conventional curved mirrors and manufacturing methods of this type include those shown in FIGS. 5 and 6, for example.

In FIGS. 5 and 6, 1 is a reflective sheet (glass mirror), and this reflective sheet 1 is made by coating a plate glass 2 with a thickness of Q and 7 mm with a reflective film 3 and a backing paint 4. Further, 5 is a rigid substrate, and this rigid substrate 5 has a paper honeycomb 8 housed between iron plates 6 and 7, and has a predetermined curved surface. The reflective sheet 1 is bonded to the concave surface of the rigid substrate 5 using an acrylic two-component adhesive 9.

The thus obtained trough-shaped parabolic mirror is suitable for high-temperature heat collection (200 to 300° C.) using solar energy, and has a high reflectance to solar radiation. For example, the thickness is Q, a 7mm glass mirror (reflective sheet)
1 as a back mirror, a reflectance of 93% can be obtained.

Further, as other conventional examples, there are the following, for example.

Japanese Utility Model Application Publication No. 54-33652 describes a glass plate and a rigid substrate bonded with polyvinyl butyral, and Japanese Unexamined Utility Model Publication No. 57-182432 describes a mirror sheet and a support sheet made of thermoplastic foil. (for example, polyester chains). Further, JP-A-55-106402 also describes a structure in which a glass layer and a metal layer are bonded together using thermoplastic foil, and JP-A-57-182433 discloses that a first vitreous sheet and a metal layer are bonded together using thermoplastic foil. It is described that two sheets are bonded together using an epoxy adhesive having a viscosity range of 40 to 70 poise.

(Problem to be solved by this invention) However,
In such conventional products and their manufacturing methods,
There were the following problems. For example, when polyvinyl butyral is used, it is necessary to pressurize it at a temperature of 150°C with an autogelape, and when a thermoplastic foil is used, it is depressurized, degassed, and heated at a temperature of about 100°C. Furthermore, even when using an epoxy resin adhesive, it was necessary to degas it by reducing the pressure and heat it to about 60°C.

As mentioned above, in the conventional example, the process is complicated,
There was a problem that it was not suitable for mass production.

(Means for Solving the Problems) The present invention has been made in view of these conventional problems, and provides a curved mirror that has a simple process, is suitable for mass production, and is inexpensive, and a manufacturing method thereof. It is intended to.

In order to achieve this objective, the present invention has a thickness of 0.3
A reflective sheet of ~1.2 mm and a plate glass curved in one direction with a thickness of 2 to 8 mm are bonded together using a pressure-sensitive double-sided adhesive sheet. A pressure-sensitive double-sided adhesive sheet is pasted on one side of the sheet, then a reflective sheet or plate glass is laminated on the pasted pressure-sensitive double-sided adhesive sheet, and then a predetermined pressure is applied to the resulting laminate in the atmosphere at room temperature. and glue.

(Function) In this invention, a pressure-sensitive double-sided adhesive sheet is used to adhere the reflective sheet and the glass plate at room temperature and atmospheric pressure, so it is possible to produce eight curved mirrors with a simple process. . The obtained curved mirror was inexpensive and had excellent weather resistance and durability.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

First, to explain the configuration, in FIG. 1, 11 is a curved mirror, and this curved mirror 11 is a reflective sheet (glass mirror) 1.
2 and the float glass plate 13 using a pressure-sensitive double-sided adhesive sheet 14.
It has a predetermined curved surface.

The reflective sheet 12 is a glass plate coated with a reflective film (silver film), a protective film (copper film) coated on top of that, and a protective film (backing paint) coated on top of that, and can be used as a glass mirror. It has the following functions. The thickness of the reflective sheet 12 is in the range of 1.2 to Q, 3 mm.

In addition, the thickness of the float glass plate 13 is 2 to 8
mm, and at least the surface is required to be smooth, clean, and dry.

Further, as the pressure-sensitive double-sided adhesive sheet 14, for example, a nonwoven fabric is used as the base material, an acrylic resin is used as the adhesive, and the thickness is 0.16 mm.

This curved mirror 11 is subjected to temperature cycles using a weather meter.
When tested under high temperature and high humidity conditions, the silver film of the glass mirror 12 did not discolor and exhibited excellent weather resistance. Therefore, it was durable for outdoor use and was optimal as a solar energy utilization device.

Next, a method for manufacturing the curved mirror 11 will be explained in FIGS.
) and FIGS. 3(A>, (B)).

First, the manufacturing method shown in FIGS. 2(A) to 2(C) will be explained.

In FIG. 2 (A>), a float glass plate 13 with a thickness of 4 mm is conveyed to a predetermined position by a conveyance roller 15. Here, the thickness of the float glass plate 13 is in the range of 2 to
8 mm is preferred. This is because within this range, a predetermined curvature and rationality can be ensured. The float glass plate 13 has arms bent in one direction, and a pressure-sensitive double-sided adhesive sheet 14 is pasted on the concave side of the glass via a roller 16, and when it is pasted, a release paper 17 of the adhesive sheet 14 is wrapped around it. cutter 1 at the rear end of the float glass plate 13.
8, the adhesive sheet 14 is cut.

As the double-sided adhesive sheet 14, a base material or non-Rubble cloth, an acrylic resin adhesive, and a thickness of 0.16 mm are used, but the base material is not limited to this, but the base material may be paper or polyester, etc. Sen resin as adhesive, thickness 0.1~
Q.Those in the range of 3mm can also be used.

Next, as shown in FIG. 2(B), a crane 20 equipped with a decompression box 19 having a hole in the lower surface is used to reduce the thickness to Q.
The glass mirror 12 of 7 mm is laminated on the adhesive sheet 14 so that the reflective surface of the glass mirror 12 faces upward.

Here, the thickness of the glass mirror 12 is preferably in the range of 0.3 to 1.2 mm from the viewpoint of reflectance and adhesion workability. If it is less than 0.3mm, it will break easily, and 1.2
If it exceeds mm, the reflectance will be 90% or less. When the reflectance is less than 90%, the performance as a heat collector that utilizes solar energy is poor.

The relationship between glass thickness and solar radiation reflectance is shown in FIG. The glass here refers to iron (F) in the glass composition.
e203”) equivalent to 0.1%.

Next, as shown in FIG. 2(C), the laminate 21 is passed between a pair of upper and lower press rolls 22 and 23. 3 to 5 KC per area of the laminate 21 when passing]/C
Apply a pressure of m2. When the pressure is less than 3 kg/cm2, the adhesive force is insufficient, and when the pressure exceeds 5 kg/cm2, the glass mirror 12 may break. Press roll 22,2
3 rotates at the same speed, and the speed is 1 to 3 m/min.

Note that as a method of applying pressure, an air cylinder using a spring or compressed air may be used.

As a result, the air bubbles are sequentially sent out to the rear, completing degassing and adhesion. In this case, only minute bubbles remain, but this does not pose a practical problem.

Here, the lower curved surface of the laminate 21 is supported by the cylinder 24, but the top of the laminate 21 is moved up and down appropriately as shown by the arrow so that it can easily fit between the press rolls 22 and 23. This is desirable. However, this vertical movement does not necessarily have to be performed strictly;
If the radius of curvature is large or if the stacked body 21 is small, it may be omitted and pushed up using a splinter. Note that after the laminate 21 passes through the press rolls 22 and 23, if necessary, the adhesive sheet 13 protruding from the edges is cut off with a cutter.

Furthermore, protecting the rough edges with silicone resin or sealing tape is a preferable finishing treatment for applications that require greater weather resistance.

Next, another manufacturing method will be explained based on FIGS. 3A and 3B.

First, as shown in FIG. 3 (A>), the pressure-sensitive double-sided adhesive sheet 14 is pasted on the opposite side of the reflective surface of the 0.7 mm glass mirror 12, which has been conveyed by the conveyance roller 15, via the roller 6. After adhering, the release paper 17 of the adhesive sheet 14 is wound up and cut into a cutter 18 at the rear end of the glass mirror 12.
Cut with.

Next, as shown in FIG. 3(B), the flexible glass mirror 12 is pushed up and held by the cylinder 24 so as to be in a curved state. Next, a crane 26 with a suction cup 25
Then, a glass temporary 13 of 4 mm, which was formed into a curved shape on one side, was stacked on the adhesive sheet 14 and one seedling was placed thereon.

Next, as shown in FIG. 2(C), when the obtained laminate 21 is passed between a pair of upper and lower presses 22.23, 3 to 5 Kg/Cm per CIi area of the laminate 21 is
Apply the pressure in Step 2 to complete the adhesion as well as degassing. If it is a must-shell, finish it as described in O1J.

As described above, in this invention, the pressure-sensitive double-sided adhesive sheet 14 is used to bond the crow mirror 12 and the curved float temporary crow 13 onto the press rolls 22 and 23 at room temperature and atmospheric pressure. I did it like that. Therefore, compared to the conventional example, there is no need for a stockyard for curing the adhesive layer 11, and there is no stagnation in processes such as depressurization, heating, pressurization, and heating, making it suitable for mass production.

(Effects of the Invention) As described above, according to the present invention, a glass mirror and a float glass plate can be bonded together at room temperature and atmospheric pressure, and mass production can be achieved. The obtained curved mirror had excellent weather resistance and durability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 (A
) to (C) are each explanatory diagram for explaining the manufacturing method, the third
Figures (A> and (B) are explanatory diagrams for explaining other manufacturing methods, Figure 4 is a graph showing the relationship between glass thickness and reflectance, Figure 5 is a sectional view showing a conventional example, Fig. 6 is an enlarged sectional view thereof. 11... Curved mirror, 12... Reflective sheet (glass mirror), 13... Plate glass, 14... Double-sided adhesive sheet, 15... Conveyance roller, 16... Roller, 17... Release paper, 18... Cutter, 19... Decompression box, 20.26... Crane, 21... Laminate, 22.23... Press roll , 24...Cylinder, 25...Sucker.

Claims (2)

[Claims] (1) A curved surface characterized by joining a reflective sheet with a thickness of 0.3 to 1.2 mm and a plate glass curved in one direction and with a thickness of 2 to 8 mm using a pressure-sensitive double-sided adhesive sheet. mirror. (2) A pressure-sensitive double-sided adhesive sheet is attached to one side of a plate glass or a reflective sheet that is curved in one direction, and then a reflective sheet or plate glass is laminated on the attached pressure-sensitive double-sided adhesive sheet. A method for manufacturing a curved mirror, which comprises bonding a laminate by applying a predetermined pressure in the atmosphere at room temperature.