JPH0695601A - Production of display body for signboard made of synthetic resin - Google Patents

Abstract

PURPOSE:To facilitate the production of the display body having a large size and large area and to provide the display body which is excellent in terms of strength and design characteristic by utilizing a double sheet molding method using two sheets of synthetic resin sheets. CONSTITUTION:The peripheral edges of the sheets 1, 2 are clamped by means of clampers 6, 7 from above and below via spacers 5 in such a manner that a closed space 15 exists therebetween. Heaters 8, 9 are introduced into the top and bottom of the two sheets 1, 2 to soften the sheets by heating. Compressed air is introduced from an air nozzle 14 into the closed space 15 to preexapnd the sheets 1, 2. While the preexpansion operation is continued, metallic molds 3, 4 for molding are brought near to the sheets 1, 2 on the inner side of the clamping positions of the peripheral edges thereof and the sheets 1, 2 are inserted between the sheet clamping parts 10 and 11 of the peripheral walls thereof, by which the sheets 1, 2 are joined and integrated. Further, the compressed air is introduced into the closed space 15 and the sheets 1, 2 are brought into tight contact with the inside surfaces of recessed parts 12, 13 for molding on the inside surfaces of the cavities of the metallic molds 3, 4 for molding. A hollow molding is taken out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signboard display made of synthetic resin, and more particularly to a three-dimensional display used mainly for an internally illuminated stand-up signboard or a protruding signboard which is used by arranging a light source inside. .

[0002]

2. Description of the Related Art Heretofore, this type of signboard display has a three-dimensional shape such as a dish or a shallow box in which a desired synthetic resin sheet is provided with a desired concave and convex display portion by a vacuum forming method or the like. It is often the case that the molded plate provided is used as a display plate, which is mounted on both sides of a metallic peripheral frame body to which a light source is mounted and which is manufactured into a desired cubic shape or the like.

However, such a conventional signboard display body not only requires a relatively large amount of time and labor for manufacturing the display board, assembling with the surrounding frame body, etc. There was a problem that it was difficult to finish the rain. Not only that, because the four sides of the peripheral side of the display are closed by the frame,
The peripheral side surface cannot be used as an effective internally illuminated display surface, and there is a drawback that the display surface is limited to only both surfaces of the display body. Furthermore, the entire display body is rich in unevenness and has a three-dimensional effect. It was also subject to the constraint that it was difficult to manufacture.

For such a general signboard display,
It has been considered that the entire display body is integrally molded with a synthetic resin molded body, and that such molding is performed by a blow molding method. However, in the blow molding method, since a parison made of a synthetic resin extruded material is used as a raw material and is expanded in a mold to be molded, the size and shape of the display body that can be manufactured is limited, and the size is large and large. It is unsuitable for manufacturing an area display. Moreover, since the whole is made of a single material, it is impossible to manufacture a display body having a high design property such that the display surfaces are different in color on the front and back sides, and it has not been put into practical use.

[0005]

SUMMARY OF THE INVENTION Under the background of the prior art as described above, the present invention is a display body which is integrally molded with a synthetic resin molding, and is a large-sized and large-area display body. Can be relatively easily performed, has excellent strength, and can be composed of two kinds of different colors or different materials of synthetic resin materials as required, and can be excellent in designability. An object of the present invention is to provide a novel method for manufacturing a display for signboard.

[0006]

SUMMARY OF THE INVENTION For the above-mentioned purpose, the present invention is to make use of a so-called double-sheet molding method using two synthetic resin sheets as a main means for solving the above-mentioned problems.

That is, according to the present invention, the two thermoplastic synthetic resin sheets are clamped at their peripheral edges via a spacer in a mode in which a predetermined closed space is left between them to heat and soften the two sheets. After that, the sheets are sandwiched between a pair of upper and lower molds on the inner side of the clamp position on the peripheral edge to be joined, and compressed air is introduced into the closed space between the two sheets to move the two sheets up and down. After forming a hollow molded body in close contact with the inner surface of the mold, then by cutting off one side edge portion of the hollow molded body in a plane substantially parallel to the plane where the joint portion of the two sheets in the hollow molded body is present. A gist of the present invention is a method of manufacturing a display for a signboard made of synthetic resin, which is characterized in that an opening for attachment is formed.

As a preferred embodiment, particularly as applied to an interior lighting type signboard, among the two synthetic resin sheets, at least the front side sheet in which the mounting opening is not formed is a milky semi-colored sheet. A transparent sheet such as a transparent sheet is used. Of course, a translucent sheet may be used for both sheets.

Further, as another embodiment, of the two synthetic resin sheets, a non-translucent sheet is used as the sheet on the base side where the mounting opening is formed, which is the reverse of the above. It is recommended to illuminate only the front display surface side so as not to illuminate, and enhance its visibility.

Further, it is preferable to use a sheet having a large strength, particularly a high tensile strength and a high impact strength, for the seat on the base side relative to the seat on the front side so that the strength of the mounting portion is increased.

[0011]

The present invention will be described in more detail below with reference to the illustrated embodiments.

FIG. 1 and FIG. 2 show a manufacturing process of a hollow molded body which is a main body of a signboard display body.
Is two thermoplastic synthetic resin sheets used as molding materials,
(3) and (4) are a pair of upper and lower molding dies, (5) is a spacer having a predetermined thickness forming an annular frame, (6) and (7) are clampers, and (8) and (9) are infrared heaters. is there.

Synthetic resin sheet (1) as a molding material
The material of (2) is not particularly limited as long as it is made of a thermoplastic resin. Although any material is selected and used according to the use of the display body, generally, a resin sheet having a thickness of about 2 to 10 mm made of, for example, a vinyl chloride resin, an acrylic resin, a polycarbonate resin or the like is used.

The synthetic resin sheets (1) and (2) may be colored and opaque if the signboard display body to be sought is not an internally illuminated type, but in general, A milky semi-transparent sheet and other colored semi-transparent sheets are used for illuminated signs. Such a translucent sheet is used only on one of the two sheets for molding, especially on one side of the display surface, and the other is made opaque so that only the front side of the display body has an internally illuminated display surface. You may form a peculiar signboard display body to configure, or use a sheet of the base side opposite to the above, which is relatively stronger than the sheet of the front side, of the mounting portion. The strength may be increased. Furthermore, both seats (1)
By using sheets of mutually different colors in (2), a display body having different color tones on the display surface side and the mounting base side may be configured. As such a combination, specifically, for example, in the case where a milky color semitransparent sheet is used for both synthetic resin sheets (1) and (2), for example, a red semitransparent sheet, a white opaque sheet, and white and blue on the front and back sides are shown. Such an opaque sheet, a pattern-printed transparent or opaque sheet, or the like can be used in any combination.

The molding dies (3) and (4) sandwich the resin sheets (1) and (2) inside the clampers (6) and (7), and perform the required shaping thereon. It has sheet clasp portions (10) and (11) protruding in a peripheral shape at the periphery,
If necessary, on the inner surface of one (12) of the molding recesses (12) (13) forming the inner cavity surrounded by the sheet attachment portion, uneven characters or symbols are provided on the display surface of the display body. Corresponding concave and convex portion (12a) for forming a display portion composed of a figure, etc.
Is provided. Further, at least one of the molding dies (4) is provided with a molding nozzle (14) protruding and retracting into the molding recess. (14a)
Is a driving means for the nozzle, for example, an air cylinder is used.

When molding a hollow molded body with the resin sheets (1) and (2), first, as shown in FIG. 1, a spacer (5) is interposed between the peripheral portions of the sheets (1) and (2). In this state, the peripheral portions are clamped from above and below by clampers (6) and (7), and both sheets (1) and (2) are parallel and horizontal with a closed space (15) left between them. Support.

Next, infrared heaters (8) and (9) are introduced above and below both sheets (1) and (2) to heat and soften the sheets from both upper and lower surfaces to a predetermined molding temperature. On this occasion,
At the same time, as shown by the chain line in FIG. 1, from the air nozzle (16) provided in a part of the spacer (5) to both sheets (1) and (2).
Compressed air is introduced into the closed space (15) between them to prevent free gravitational deformation of both sheets and pre-tension the sheets.

While continuing this pretensioning operation, after removing the heaters (8) and (9), a pair of upper and lower moldings (1) and (2) are formed on the inner sides of the clamping positions of the peripheral edges thereof. The molds (3) and (4) are brought close to each other, and both sheets (1) are placed between the sheet clasps (10) and (11) on the peripheral wall.
(2) is sandwiched to be joined and integrated, and as shown in FIG. 2, a molding air nozzle (14) provided in at least one mold (4) is provided with a driving means (14) such as a driving cylinder.
At least one of the seats (2) is penetrated by the advancing operation in a). Then this air nozzle (14)
By introducing compressed air into the closed space (15) between the sheets (1) and (2), the sheets (1) and (2) are moved to the inner surface of the cavity of the molding dies (3) and (4), that is, The inner surface of the concave portion (12) (13) is closely contacted.

Then, after the required cooling is performed while maintaining the internal pressure, the air nozzle (14) is removed and the molds (3) and (4) are opened to take out the hollow molded body (A) having a predetermined shape. is there.

By the way, the hollow molded article (A) manufactured as described above generally has both sheets (1) at the peripheral edge.
(2) has an overhanging ear-shaped joining flange (17) that overlaps in a palm shape. The joint flange (17) may be usefully utilized as a reinforcing rib in a signboard display body, or for mounting a decorative member to which a molding material or the like is attached. When it is not necessary, the flange part is cut off from the root part, leaving the joint part (18) in which both sheets (1) and (2) are joined and integrated in a mold cavity in a butt shape.
A hollow molded body (A) as shown in FIG. 3 is obtained.
In this case, it is advantageous to form a thin cutting pinch-off portion at the root portion of the flange portion (17) at the molding stage. In addition, in order to make the joint strength of the joint part (18) sufficiently strong, a part of the resin is joined from between the sheet clasp parts (10) (11) of both molds (3) (4) during molding. It is desirable to make it flow in the direction of the part (18) and to form a build-up reinforcing part on the inner surface of the joint part (18).

The molding air nozzle (14) is penetrated through at least one resin sheet (2) at the time of molding as described above. Therefore, the through hole (19) is formed in the hollow molding (A). Will remain. This through hole may be separately filled with an appropriate resin material after molding, or may be usefully used as an air circulation hole or a drain hole inside or outside the display body by appropriately selecting the forming place. good. In the illustrated embodiment, the through hole (19) is positioned at the center of the molded portion of the resin sheet (2) on the lower surface side, and the through hole (19) is removed in the partial cutting step of the molded body described later. It is supposed that the part having is cut off.

Hollow molded body (A) manufactured as described above
As shown in FIG. 3, the bowl-shaped molding halves (1a) and (2a) made of the two synthetic resin sheets (1) and (2) are joined to each other at their joints (18) at their peripheral portions in a facing arrangement. It is an integrally joined part, and in particular, an uneven display portion (20) corresponding to the uneven portion (12a) of the mold (3) is provided on the front surface of the molding half (1a) on the side constituting the display surface. And preferably has a hollow bulge (21) for forming a mounting portion at the center of the molding half (2a) on the mounting base side. In the illustrated embodiment, of both synthetic resin sheets (1) and (2), a milky or other colored semi-transparent sheet is used as the resin sheet (1) on the display side, while the resin sheet on the mounting base side is used. In (2), a colored opaque sheet of a different color from the above is used, and only the molding half (1a) side is brightly illuminated by internal illumination to enhance the display effect.

Next, as shown in FIG. 3, the upper air hollow molded body (A) is cut off at one side edge thereof by a cutting line (22) in a plane substantially parallel to the plane where the joint (18) exists.
This excision is performed in the hollow bulging portion (21) for forming the mounting portion, and a short cylindrical mounting portion (23) and a mounting opening portion (24) are formed in the hollow bulging portion (21) to obtain a desired shape as shown in FIG. To obtain a hollow signboard display body (B) integrally molded.

As shown in FIG. 4, the display body (B) is provided with a clasping piece (26) provided on a metal mounting board (25).
The peripheral portion of the mounting portion (23) is sandwiched between and fixed by screws or the like, and the illumination light source (27) provided on the mounting substrate (25) is positioned inside the display body (B) through the opening (24). At least
It is used for an internal lighting type protruding signboard for wall mounting. Of course, the mounting board (25) can also be used as a pedestal part for a stand signboard.

FIG. 5 shows a modification of the shape of the display body. The display body (C) is a so-called wall-mounted type display body for a large signboard which is mounted along a wall surface and used, and the molding half body (1a) constituting one display surface is spherical with a large radius of curvature. Or it is formed as a dish shape, and an arbitrary uneven display part (20) is formed on the spherical surface on the front side,
The other molding half (2a) enters inward at the peripheral edge of its rear surface to form a thin display body as a whole. The other structure is the same as that of the above-mentioned embodiment, and the corresponding parts are designated by the same reference numerals.

The illustrated embodiment as described above merely shows one application example of the present invention. Depending on the application
The specific shape of the display bodies (B) and (C) can be formed into any other arbitrary shape.

[0027]

According to the present invention, a signboard display made of synthetic resin, which is wholly integrally molded by the manufacturing method defined in claim 1, is relatively large even for a large-sized and large-area display. It becomes possible to manufacture easily. Moreover, the display body can utilize all other surfaces as effective display surfaces as necessary, except for the surface on the base side having the mounting opening, and for example, in the conventional product, it is covered with a peripheral frame material. Since the hidden peripheral side surface portion can also be used as a display surface as necessary, it is possible to obtain a display body having a large effective display area as a whole. Furthermore, by making it possible to simultaneously mold the display portion into any irregular shape during molding, and by using different resin sheets for the two resin sheets to be used, for example, in the case of a standing signboard, the upper and lower parts, and the protruding signboard. In the case of a wall-mounted signboard, it is possible to manufacture a display body having peculiarities such that the front part and the base part have mutually different colors.

According to the second aspect, it is possible to obtain an internally illuminated signboard display body having the above-mentioned various characteristics, and according to the third aspect, there is no illumination effect on the base side,
It is possible to obtain a display body that can further emphasize the display effect of the display surface.

Further, according to claim 4, it is possible to obtain excellent strength in the mounted and used state, and according to claim 5, it is possible to make the display member unique to have two different color portions. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a molding step of a hollow molded body in a method for manufacturing a display body according to the present invention, which is a state before performing a molding operation.

FIG. 2 is a cross-sectional view showing a state during the molding operation of FIG.

FIG. 3 is a crushing side view showing an example of a hollow molded body.

FIG. 4 is a side view showing a signboard display body manufactured according to the present invention in a use state.

FIG. 5 is a half-cut side view showing a modified example of the shape of the display body.

[Explanation of symbols]

 (1) (2) ... Synthetic resin sheet (3) (4) ... Mold for molding (5) ... Spacer (6) (7) ... Clamper (8) (9) ... Heater (12) (13) ... Molding Recessed portion (14) ... Molding air nozzle (15) ... Closed space (18) ... Joining part (20) ... Display part (24) ... Mounting opening (A) ... Hollow molded body (B) (C) ... Signboard Display

Claims (5)

[Claims] 1. Two thermoplastic synthetic resin sheets are clamped at their peripheral edges via a spacer in a mode in which a predetermined closed space is left between them to heat and soften the two sheets and then the peripheral edges. While sandwiching and joining between a pair of upper and lower molds inside the above clamp position, compressed air is introduced into the closed space between the two sheets to bring both sheets into close contact with the inner surfaces of the upper and lower molds. To form a hollow molded body, and then, by cutting off one end edge portion of the hollow molded body in a plane substantially parallel to the plane where the joint portion of the two sheets in the hollow molded body is present, the mounting opening is formed. A method of manufacturing a display for signboard made of synthetic resin, which comprises: 2. Of the two synthetic resin sheets, at least the sheet on the front side in which the mounting opening is not formed,
The method for producing a synthetic resin signboard display according to claim 1, which is applied to an internally illuminated signboard using a translucent sheet. 3. The method of manufacturing a display for signs made of synthetic resin according to claim 2, wherein a non-translucent sheet is used as the synthetic resin sheet on the base side where the mounting opening is formed. 4. The method for manufacturing a display for signs made of synthetic resin according to claim 2, wherein a sheet having relatively high strength is used for the synthetic resin sheet on the base side with respect to the synthetic resin sheet on the front side. 5. The method for producing a synthetic resin signboard display according to claim 1, wherein the two synthetic resin sheets are different in color from each other.