JP2891657B2 - Display panel made of synthetic resin and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel used for vending machines, various kinds of advertising display devices, and the like.

[0002]

2. Description of the Related Art Conventionally, a metal panel processed by sheet metal is used as a display panel of this type, and a transparent or translucent synthetic resin plate is provided in a display opening provided inside the panel. Although a device equipped with a light-transmitting face plate is generally used, the fact is that it is generally complicated to manufacture, heavy, and expensive.

Therefore, in recent years, as a display panel, two thermoplastic synthetic resin sheets are thermoformed and a hollow molded product obtained by integrating the two sheets has been put into practical use.
This hollow molded article is formed into a hollow plate-like body by integrating two layers in order to increase the rigidity of the display panel. This hollow molded product is usually produced by the following method.

[0004] First, two thermoplastic synthetic resin sheets are separately formed by a vacuum forming method or a pressure forming method, and these are joined and integrated to form a hollow plate-like body. An optical synthetic resin plate is fitted and attached with an adhesive.

Second, two transparent or translucent thermoplastic synthetic resin sheets are fitted into a pair of upper and lower molds by a so-called double sheet molding method such as a sheet blow molding method or a clam shell molding method. And a peripheral plate joined to form a hollow plate-like body having a display unit.

[0006]

However, the above-mentioned conventional display panel made of a synthetic resin hollow plate has the following problems.
Each has the following disadvantages.

That is, the first method requires a step of separately molding the two molded bodies on the front and back of the display panel and a step of joining these molded bodies, so that it takes too much time and cost. In the case of complex shapes, it is extremely difficult to join two molded bodies, warpage occurs in the panel after joining, and high joining strength cannot be obtained, and light transmittance when joining the molded bodies There is a problem that the display unit is stained or eroded with the adhesive. In particular, stains and erosion of the display unit are a major defect in quality as a display panel.

[0008] In the second method, since the molding is performed using a female mold in principle, the surface in direct contact with the mold is inevitably used as the practical surface of the display section. Become.
For this reason, there is a problem in that the mold surface or scratches of the mold during molding, or the form of dust or foreign matter interposed between the mold and the molding material is transferred to the display portion of the molded body as it is. In particular, such a defect of the display portion is very conspicuous in appearance when it is on the practical surface side of the display panel, that is, on the visual side, and the quality of the display panel is remarkably deteriorated.

Further, in consideration of the second problem, a part of the molded body on the practical surface side is cut out, and a light-transmitting synthetic resin plate separately prepared is attached to the cut-out part for display. However, since the cut portion extends over the front and back of the display panel, there is a disadvantage that the material loss increases.

The present invention solves the above-mentioned conventional problems and, in principle, utilizes the conventional double-sheet forming method, as a display panel, has excellent appearance quality of a display section, and is structurally It is an object of the present invention to provide a display panel made of synthetic resin, which has high strength and is easy and economical to manufacture, and a method of manufacturing the display panel.

[0011]

According to the above object, a first invention of the present invention comprises a transparent or translucent rear plate and a front plate having an opening inside, wherein each of the plates is provided with a respective one of them. A peripheral portion and an outer peripheral portion of the opening are joined and integrated, and a display portion is formed by a back plate covering the opening, and a portion surrounded by the peripheral portion and the outer peripheral portion is hollow. The gist of the present invention is a display panel made of synthetic resin.

A second invention of the present invention is a manufacturing method for manufacturing the synthetic resin display panel of the first invention, which is for a transparent or translucent back plate made of a thermoplastic resin. A sheet and a sheet for a front plate made of a thermoplastic resin are sandwiched by a clamper at a peripheral portion thereof through a spacer in a state where a predetermined closed space is left therebetween. Between the upper and lower dies having the outer peripheral crimping portion and the outer peripheral portion of the display portion, and are integrally joined by the respective crimping portions, and compressed air is introduced into a closed space partitioned by the joining portion, and the two sheets are joined together. A synthetic resin display panel, wherein the front panel sheet is cut off inside a joint portion formed by the display portion outer peripheral pressure-bonding portion, after being brought into close contact with the inner surface of the mold and cooled and taken out of the molded body. The method of manufacturing the gist.

Hereinafter, the present invention will be described with reference to the drawings.

First, according to a first aspect of the present invention, as shown in FIG. 1, in a display panel (1) made of synthetic resin, a transparent or translucent rear plate (2) and a display portion are provided inside the plate surface. (5)
A front plate (3) having an opening (4) for forming is combined at the periphery (S0) of the back plate (2) and the front plate (3) and the outer periphery (S1) of the opening (4). The display unit (5) is formed by a back plate (2) that covers and joins the opening (4) from the back side of the synthetic resin display panel (1). Perimeter (S
0) and the portion surrounded by the outer peripheral portion (S1) are hollow.

In the display section (5), an opening (4)
Is formed by cutting the front plate (3) inside the outer peripheral portion (S1), and the display portion (5) has the inner surface (a) of the rear plate (2) facing the practical surface side. It is formed in the form.

In the present invention, the display section (5) can have a modified structure as shown in FIG. That is, when the display unit (5) is arranged on the same plane as the panel surface (PL) as shown in FIG. 2A, the display unit (5) is moved from the panel surface (PL) as shown in FIG. This is also the case where the display unit (5) is disposed inside the panel surface (PL) as shown in FIG. These structures are arbitrarily selected and determined according to the application, and are executed by changing the shape of a mold used at the time of molding.

Next, the second invention of the present invention will be described. As shown in FIG. 3A, first, a transparent or translucent sheet for a back plate (12) made of a thermoplastic resin and a thermoplastic resin are used. The front panel sheet (13) is clamped from above and below by clampers (16) and (16) via spacers (15) while leaving a predetermined closed space (14) therebetween. After softening both sheets (12) and (13) by heating, as shown in FIG.
a) and a pair of upper and lower molds (17) and (18) having a display portion outer peripheral crimping portion (17b) and (18b) and joining by the respective crimping portions, as shown in FIG. The compressed air introduction nozzle (19) attached to the mold (17) is in the closed space (14a) (14b) partitioned by the joint.
a) Both sheets (12) by introducing compressed air from (19b)
(13) is brought into close contact with the inner surfaces of both molds (17) and (18), and is cooled as it is to take out the compact (11).

Next, as shown in FIG. 4, the sheet (13) for the front plate of the molded body (11) is attached to the outer peripheral crimping portion (17) of the display portion.
b) Cut along the cutting line (X1-X1) inside the outer peripheral portion (S1) joined by (18b), and further trim the peripheral portion (S0) along the cutting line (X2-X2). The display panel (1) made of synthetic resin is obtained.

Here, the molds used in the above molding process will be described. The upper and lower molds (17) and (18) include:
In order to introduce compressed air into the closed spaces (14a) (14b) which are separated by bringing these two sheets into a closed state by being close to each other, a plurality of closed spaces (14a) (14b) respectively corresponding to the two closed spaces Nozzle for compressed air introduction (19a)
(19b) shall be installed in the mold (17) so that the compressed air introduction nozzles (19a) and (19b) can be simultaneously inserted into both closed spaces (14a) (14b) when introducing compressed air. I do. The means for introducing compressed air is not necessarily limited to the above. For example, one compressed air introduction nozzle (19a) to be inserted only into the closed space (14a) is provided, and both the closed space (14a)
(14b) A communication hole groove (20) for forming a compressed air communication hole communicating with each other through both sheets (12) and (13).
The outer peripheral crimping part (17b) or (18b)
Of a closed space (14) when compressed air is introduced.
The compressed air introduction nozzle (19a) is inserted into a), and the other closed space (14) is inserted through the compressed air communication hole (20).
It is also possible to feed compressed air to b) at the same time.

The molded product (1) obtained by the above molding operation
1) is that the inner surface (a) of the back plate sheet (12) is heated and softened without being in contact with the mold (18) in the molding process, and is shaped. Alternatively, since the shape of dust and foreign matter is not transferred and there is no mechanically contacting object, the inner surface (a) is formed into an extremely smooth mirror surface.

Next, the structural relationship between the back plate sheet (12) and the front plate sheet (13) of the compact (11) will be described below.

The display panel (1) of the molded body (11) is shown in FIG.
In any of the deformation structures shown in (a) to (c), the back plate sheet (12) and the front plate sheet (13) in the display section (5) come into contact with each other during heat forming. It is important to have a structure that does not melt or thermally fuse. Therefore, both sheets (12) in the display unit (5)
It is desirable to increase the distance between (13) and further to relatively increase the plate surface angle of both sheets (12) and (13) inside the joint.

As shown in FIG. 5, the adjustment of the plate surface angle (D) is performed mainly by the rising angle (d) of the front plate sheet (13). The reason is that by appropriately selecting the rising angle (d), the workability when cutting the front panel sheet (13) inside the outer peripheral portion (S1) by the cutting machine (M) can be improved, This is because it is possible to adjust the inner surface (a) of the back plate sheet (12) so as not to damage the inner surface (a).

The sheet for the back panel and the sheet for the front panel used in the display panel of the present invention can be appropriately selected according to the use of the display panel. For example, polyvinyl chloride and vinyl chloride are mainly used. Vinyl chloride resins such as vinyl chloride copolymers as components, acrylic resins such as polymethyl methacrylate and its copolymers, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate resins,
Examples include a thermoplastic resin such as a polyamide resin, or a sheet formed from a thermoplastic resin composition such as a graft polymer or a polymer blend containing any of these as a main component.

The thickness of the sheet material suitable for the present invention is 1 to 10 mm. Further, a transparent or translucent colorless or colored sheet is used as the sheet for the back plate, but the sheet for the front plate is not limited thereto. Furthermore, the back sheet and the front sheet may be made of mutually different materials as long as they are made of mutually compatible resins.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

The display panel made of synthetic resin of the present invention is shown in FIG.
As shown in FIG. 1, a transparent or translucent rear plate (2) and a front plate (3) having an opening (4) inward are provided, and each of the plates (3) and (4) has a peripheral portion (S0). ) And the outer periphery (S1) of the opening (4) of the front plate (3) are integrally joined,
A portion surrounded by the peripheral portion (S0) and the outer peripheral portion (S1) is hollow, and has a display unit (5) formed by a back plate (2) covering the opening (4). I do.
In this case, as shown in FIGS. 2A to 2C, the display section (5) can adopt either the same plane or the outside or inside of the panel surface (PL).

As shown in FIGS. 3A to 3C, the method for manufacturing a synthetic resin display panel according to the present invention comprises a transparent or translucent rear plate sheet (12) made of a thermoplastic resin and a front plate. Sheet (13) and a predetermined closed space (14)
While holding the sheet, clamp the peripheral part with the clampers (16) and (16) via the spacer (15),
After heat-softening (13), the peripheral crimping parts (17a) (18)
a) and a pair of upper and lower molds (17) and (18) having a display portion outer peripheral crimping portion (17b) and (18b), and are integrally joined at each of the crimping portions, and closed at a joint portion. Compressed air is introduced into the spaces (14a) (14b) to bring both sheets (12) and (13) into close contact with the inner surfaces of both molds (17) and (18).
It cools as it is and takes out a molded object (11). Then, as shown in FIG. 4, a sheet (13) for a front plate of the molded body (11)
The outer peripheral portion (S1) joined by the outer peripheral crimping portions (17b) and (18b) is cut off by a cutting machine (M), and the outermost periphery is trimmed to form a synthetic resin display panel (1). obtain.

In the synthetic resin display panel of the present invention obtained as described above, the practical surface of the display portion (5) is in contact with the inner surface (a) of the back plate (2), that is, the mold at the time of molding. Since the back plate sheet (12) is not formed with the non-contact surface of the mold, the display panel (1) made of synthetic resin having an extremely smooth mirror-like display portion is obtained.

[0030]

Next, an embodiment of the present invention will be described.

Example 1 A synthetic resin display panel to be obtained has a dimensional specification of 1200 mm in height, 500 mm in width and 35 mm in thickness, and the size of the display section is 400 mm in height and 400 mm in width, and the position of the upper side is set. Is located at a position 300 mm from the upper side of the display panel, and the surface of the display portion is outside the panel surface as shown in FIG.

As a molding material, a 2.0 mm-thick transparent polymethyl methacryl plate is formed on the back sheet by an extrusion method, and a 2.0 mm-thick black opaque sheet is formed on the front sheet by an extrusion method. Acrylic modified high impact vinyl chloride plate was prepared. In addition, each was 1400 mm in length and 700 mm in width.

Then, a conventional general double sheet molding method is basically adopted, and the above-mentioned two sheets are arranged above and below a spacer having a thickness of 25 mm, with the sheet for the front plate being on the upper side. Then, the peripheral portions of both sheets were clamped by a clamper to support the airtight closed space.

Then, both sheets are heated to 180 ° C. by a conventional method, and in a softened state, the dies are brought close to each other so as to be sandwiched between a pair of upper and lower dies having a peripheral crimp portion and a display portion outer peripheral crimp portion. To join and integrate the peripheral part,
The compressed air introduction nozzle attached to the upper mold,
It was inserted into the sheet for the front plate inside the outer peripheral pressure-bonding part of the display part, compressed air at a pressure of 3 kg / cm ² was introduced, left for 2 minutes, and then cooled while maintaining the pressure in the closed space at the above value.

After the cooling is completed, the pressure is returned to normal pressure, the molded body is taken out, and the inside of the joint of the front panel sheet and the outermost peripheral part of the molded body is cut off by an NC router. The outer periphery was trimmed to obtain a synthetic resin display panel in which the display surface was flush with the surface of the display panel and the practical surface of the display portion was a smooth mirror surface.

Embodiment 2 The display panel made of synthetic resin to be obtained has a dimensional specification of both height and width of 1000 mm and a thickness of 50 mm, and the size of the display section is both height and width of 600 mm and the position is indicated. It is assumed that it is located at the center of the panel, and that the surface of the display unit is flush with the panel surface as shown in FIG.

As a molding material, a transparent polymethyl methacryl plate having a thickness of 3.0 mm by an extrusion molding method is used for a sheet for a back plate, and a gray opaque gray sheet having a thickness of 3.0 mm is used for a sheet for a front plate. Was prepared. In both cases, both the length and the width were 1200 mm.

Next, Example 1 was performed using the above molding material.
In the same manner as described above, after obtaining the molded body, the inside of the joined portion of the front panel sheet by the display outer peripheral pressure bonding portion and the outermost peripheral portion of the molded body are cut off by an NC router, and the outermost periphery is trimmed. The inside surface is inside the front surface of the display panel, and the back surface of the display unit is on the same plane as the back surface of the display panel. .

[0039]

As described above, in the synthetic resin display panel of the present invention, the transparent or translucent rear plate and the front plate having an opening inward are integrally joined to each other, so that the structural strength is improved. Since the display unit is formed with the back surface covering the opening being high and the inner surface that is not in contact with the mold at the time of molding being formed on the practical surface side, the appearance quality of the display unit as a display panel is excellent. . According to the method of manufacturing a display panel of the present invention, in principle, a portion surrounded by a peripheral portion and an outer peripheral portion of an opening is made hollow using a conventional general double sheet forming method. Since the display section is formed by the sheet for the back plate, it can be easily formed into a deformed structure, which is rich in design, and is easy and economical to manufacture. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a synthetic resin display panel of the present invention.

FIG. 2 illustrates a synthetic resin display panel of the present invention, and FIGS. 2A to 2C are cross-sectional views each showing a modification of the structure of the display unit.

FIG. 3 is a cross-sectional view showing a molding step in a method of manufacturing a display panel made of a synthetic resin according to the present invention. FIG. 3 (a) shows a state when a molding material is heated, and FIG. FIG. 3C shows a state in which the materials are joined and integrated, and FIG. 3C shows a state in which compressed air is introduced for molding.

FIG. 4 is a cross-sectional view showing a cutting position and a trimming position of the molded body obtained in the molding step of FIG.

5 is a partial cross-sectional view showing the structure of a display portion of the molded body of FIG. 4; FIG. 5 (a) is a plane angle between sheets which are molding materials, and FIG. 5 (b) is a vertical sheet of a front plate; The upper angle is shown.

FIG. 6 is a partial cross-sectional view showing an embodiment of the synthetic resin display panel of the present invention. FIG. 6A shows a case where the display unit is on the same plane as the surface of the display panel. Indicates that the display unit is on the same plane as the back surface of the display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Display panel 2 ... Back plate 3 ... Front plate 4 ... Opening 5 ... Display part 11 ... Molded body 12 ... Back plate sheet 13 ... Front plate sheet 17 ... Die 18 ... Die 19a ... Compressed air introduction Nozzle 19b ... Compressed air introduction nozzle S0 ... Perimeter S1 ... Perimeter

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G09F 13/04 B29C 51/14 B29K 101: 12 B29L 9:00 B29L 31:00

Claims (4)

(57) [Claims] 1. A transparent or translucent back plate and a front plate having an opening inward, wherein each of the plates is joined and integrated at a respective peripheral portion and an outer peripheral portion of the opening. A display panel made of a synthetic resin, wherein a display portion is formed by a back plate covering the opening, and a portion surrounded by the peripheral portion and the outer peripheral portion is hollow. 2. The synthetic resin display panel according to claim 1, wherein the surface of the back plate covering the opening is flush with the surface of the front plate. 3. The synthetic resin display panel according to claim 1, wherein the surface of the back plate covering the opening is not flush with the surface of the front plate. 4. A manufacturing method for manufacturing the synthetic resin display panel according to claim 1, wherein the transparent or translucent sheet for a back plate made of a thermoplastic resin and the sheet for a front plate made of a thermoplastic resin. And, after leaving a predetermined closed space therebetween, clamping the peripheral portion by a clamper via a spacer, heating and softening the two sheets, and then forming a pair of upper and lower portions having a peripheral crimping portion and a display portion peripheral crimping portion. And pressurized air is introduced into the closed space partitioned by the joints, and both sheets are brought into close contact with the inner surfaces of both molds and cooled as they are to form a compact. And removing the front plate sheet inside the joint portion formed by the outer peripheral pressure-bonding portion of the display portion.