JPS6130849Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a laminated plastic plate formed by laminating a plastic plate-like body and a plastic film.

In recent years, a synthetic resin film with patterns printed on the surface using transparent colored ink is laminated and heat-sealed onto a plate-shaped body made of transparent thermoplastic synthetic resin, and the surface is further embossed. A resin board has been developed and is mainly used for store decorations, building openings, etc. Stained glass has long been known as suitable for this purpose. However, stained glass is extremely expensive and cannot be used easily. On the other hand, since resin plates can be manufactured and supplied at low cost, their appearance is welcomed.

However, like stained glass, the resin plate described above is beautiful in transmitted light, but has the disadvantage that it lacks beauty when viewed from the side with light. For example, when used for openings such as windows in a house, it looks beautiful indoors during the day due to the transmitted light from outside, but at night there is no transmitted light from outside, so the color pattern becomes dark, and the color pattern becomes dark during the daytime. I can't expect beauty at all. Of course, at night, indoor lighting makes the building look beautiful from outside, but this is not very meaningful to the occupants of the building.

The present invention improves the above-mentioned drawbacks and provides a resin board that always looks beautiful from any side as long as there is light regardless of where it is used, day or night. That is, the present invention is a laminate in which a plate-like body 1 made of a transparent thermoplastic synthetic resin as a base material and a transparent thermoplastic synthetic resin film 2 are laminated and heat-sealed with a printed layer 3 interposed therebetween. In the plastic board, the printing layer includes a white ink solid layer 4 and a transparent chromatic pattern ink layer 5 overlapping this.
A laminated plastic board characterized by comprising:

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows an enlarged sectional view of the laminated plastic plate of the present invention, showing a plate-like body 1 and a film 2.
are laminated and heat-sealed with a printed layer 3 interposed therebetween. In addition, the thickness ratio between the plate-shaped body 1 and the film 2 is 50.
The thickness of the plate-like body 1 is omitted from the drawing because it may double. In addition, in the figure, the plate-like body 1 and the printed layer 3 are shown to be in close contact with each other, but as if they exist independently, but in reality, as can be imagined from the manufacturing method described later, the plate-like body 1 and the printed layer 3 are It is assumed that the printed layer 3 and part of the surface of the film 2 are considerably melted into the surface of the shaped body 1.

The plate-like body 1 referred to in the present invention is made of a transparent thermoplastic synthetic resin as a base material, and is preferably made of, for example, methyl methacrylate resin, polystyrene, or polycarbonate. In particular, polymethyl methacrylate resin, commonly referred to as acrylic resin, is a preferred material in terms of weather resistance, beauty, and processability. Film 2 is
Materials made from thermoplastic and transparent synthetic resins, such as acrylic films (for example, "Koratsudo" manufactured by Koratsud Co., Ltd., or "Sanjiyuren" manufactured by Kanekabuchi Chemical Industry Co., Ltd.), polystyrene films ( For example, the product name “Stylo Film”
manufactured by Asahi Dow Co., Ltd.), polycarbonate film (for example, product name "Panlite Film" manufactured by Teijin Kasei Ltd.)
It is preferable that the film 2 and the plate-shaped body 1 are made of the same material. For example, when an acrylic film and an acrylic resin plate are combined. The thickness of the plate-shaped body 1 is 1 to 10 mm, preferably 2 to 6 mm. Further, the thickness of the film 2 used is 20 to 150 microns.

The printing layer 3 consists of a white ink solid layer 4 and a transparent chromatic pattern ink layer 5 overlapping it, but the overlapping order is as shown in FIG. The layer 5 may be formed in this order, or the transparent chromatic pattern ink layer 5 and the white ink solid layer 4 may be formed in this order from the film side.
Both ink layers 4 and 5 constituting the printing layer 3 are made of pigment and resin. The resin for this ink layer is selected from a resin that has good compatibility with the materials of the plate-shaped body 1 and film 2. For example, in the combination of the above-mentioned acrylic film and acrylic resin plate, acrylic resin is optimal for the ink layer. The thickness of the printing layer 3 is around 10 microns, but it can be made thinner to make the brightness brighter, and thicker to make it darker. Although the thickness ratio of the two ink layers 4 and 5 is not particularly limited, the solid white ink layer 4 may be considerably thinner than the transparent chromatic pattern ink layer 5. In any case, the printing layer 3 as a whole must be semi-transparent. The pigment must have sufficient weather resistance and be uniformly dispersed in the resin. However, it is currently difficult to obtain ink compositions with good weather resistance and good light transmittance at low cost. Since the laminated plastic board of the present invention is a product intended for frequent outdoor use, it must be resistant to fading due to sunlight.
Sunlight contains a large amount of ultraviolet rays. Ultraviolet light generally has the effect of degrading or fading materials in the presence of oxygen. By confining the printed layer 3 between the plate-shaped body 1 and the film 2, it is possible to block out ultraviolet rays and oxygen to some extent, but this is extremely insufficient. Therefore, by incorporating an ultraviolet absorber into the thermoplastic synthetic resin that is the material of the plate-shaped body 1 and the film 2, it is possible to almost completely prevent ultraviolet rays from reaching the printed layer 3. As the ultraviolet absorber, for example, Tinuvin P (trade name, manufactured by Ciba Geigy) is contained at about 2% by weight in the case of a 50 micron film. On the other hand, plate-like materials are relatively thicker than films, so
Around 0.2 weight percent or less is sufficient.

The surface of the laminated plastic board of the present invention may be smooth, or may have an uneven structure on one or both sides. FIG. 2 shows an enlarged sectional view of the laminated plastic board of the present invention, which is provided with uneven structures 6, 6' on both sides. The laminated plastic plate having the uneven structure 6, 6' on its surface has a solid feel due to the diffuse reflection of light. Note that the white ink solid layer 4 constituting the printing layer 3 and the overlying transparent chromatic pattern ink layer 5 are arranged in the reverse order as in the case of FIG. 1. Furthermore, as shown in FIG. 2, the uneven structure 6 on the film side forms an uneven structure in which the surface of the plate-like body 1, the film 2, and the intervening printed layer 3 are integrated. As a result, the adhesion between the plate-shaped body 1 and the film 2 is even stronger.

To manufacture the laminated plastic board of the present invention,
First, white gravure printing ink is applied to one side of the film using a gravure printing machine so that it remains semi-transparent. At this time, a non-engraved gravure roll is used. The pigment in white gravure ink is usually titanium white, which has good hiding properties. However, semi-transparent solid printing is possible by coating the film thinly or using a large amount of medium. The key point of the present invention is that this white ink is adjusted to have semi-transparent properties on the film and then printed all over the film. Semi-transparent property is a property in which part of the light becomes transmitted light and the other part becomes reflected light. Next, a stained glass pattern, for example, is overprinted on this semi-transparent film using chromatic transparent ink. In this way, a printing layer 3 consisting of a white ink solid layer 4 and a transparent chromatic pattern ink layer 5 overlapping the white ink solid layer 4 is formed on the film 2. Note that the printing order of the solid white ink layer 4 and the transparent chromatic pattern ink layer 5 may be reversed if necessary. While extruding the plate-like body 1 made of thermoplastic synthetic resin as a base material using an extruder, the printed films 2 obtained as described above are laminated so that the printed layer 3 is on the inside. Thereafter, this laminate is passed between two rolls to bring them into close contact. Since the films 2 are laminated and adhered to each other while the plate-shaped body 1 is in a molten state, thermal fusion can be achieved without using any particular adhesive. By providing an embossing roll with a suitable pattern on one or both surfaces of the rolls, a laminated plastic board having an uneven structure 6, 6' on its surface can be produced.

Since the laminated plastic board of the present invention has the above-described structure, it has the property of transmitting part of the light, but reflecting the other part by the solid white ink layer. Therefore, for example, in the laminated plastic plate shown in the example of FIG. 1, when light is applied from the film side, a portion of the light passes through the laminated plastic plate, so when viewed from the plate side, the transparent chromatic ink is The pattern is beautiful to admire. Conversely, when light is applied from the plate side, part of the light passes through the laminated plastic plate, but the other part is reflected by the solid white ink layer, so when looking at it from the plate side, it is also transparent. You can see the pattern of the colored pattern ink layer. In other words, the user can always view the chromatic pattern regardless of the side of the light source. Such properties are not present in conventional stained glass or in resin plates used for similar purposes. In the case of the example shown in FIG. 2, the laminated plastic board is used so as to be viewed from the film side. That is, the white ink solid layer 4 is preferably placed farther from the viewer than the transparent chromatic pattern ink layer 5.

Since the present invention has the above-mentioned effects, it is useful for store decorations, building openings, signboards, display displays, etc.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a laminated plastic board that is an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a laminated plastic board having an uneven structure on both sides, which is another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Plate-shaped body, 2... Film, 3... Printing layer, 4... White ink solid layer, 5... Transparent chromatic pattern ink layer, 6... Concavo-convex structure.

Claims (1)

[Claims for Utility Model Registration] 1. A plate-like body 1 made of a transparent thermoplastic synthetic resin as a base material and a transparent thermoplastic synthetic resin film 2 are laminated and heat-sealed with a printed layer 3 interposed therebetween. In the laminated plastic board made of
A laminated plastic board comprising a solid white ink layer 4 and a transparent chromatic pattern ink layer 5 overlapping the white ink solid layer 4. 2. The laminated plastic board according to claim 1, wherein the printed layer 3 is semi-transparent. 3. A laminated plastic board according to claim 1 or 2 of the utility model registration claim, which has an uneven structure 6 on one or both sides. 4 Utility model registration claims 1 to 3 in which the thermoplastic synthetic resin is a methyl methacrylate resin, polystyrene, or polycarbonate
The laminated plastic board according to any one of Items 1 and 2. 5 Utility model registration claims 1 to 4 in which both the plate-like body 1 and the film 2 contain an ultraviolet absorber
The laminated plastic board according to any one of paragraphs.