JPH06278261A - Decorative sheet with uneven appearance inside and manufacture of the same - Google Patents

Abstract

PURPOSE:To provide a decorative sheet with an uneven appearance inside in spite of the smooth surface without using a polyvinyl chloride resin. CONSTITUTION:On the surface of a colored polyolefin thermoplastic resin sheet 1 having unevenness 2 is laminated a transparent polyolefin thermoplastic resin sheet 3 which eliminates the unevenness to make the smooth surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet used for a decorative board used in the field of construction materials and the like, and a method for manufacturing the same, and more particularly to a decorative sheet having an unevenness inside and a method for manufacturing the same.

[0002]

2. Description of the Related Art As a conventional decorative sheet having a smooth surface and a feeling of unevenness, (1) a top coat is formed by giving an uneven pattern to the surface of a thermoplastic film by embossing so as not to lose the feeling of unevenness. A decorative sheet having an uneven surface shape, (2) a decorative sheet which is embossed to give an uneven pattern to the surface of a thermoplastic film, and ink is embedded in the concave parts to give a deep feeling, (3) colored Embossing is applied to the thermoplastic film, UV-curable resin is applied on the uneven surface, and the uneven surface is filled up with a decorative sheet,
Etc.

When embossing a decorative sheet to give an uneven pattern, there are many applications that require designability as described in (1) and (2) above, and there are those that try to express a different design feeling by embossing. The above was (3). However, in the case of (3), since the uneven shape due to embossing is not clear or the ultraviolet curable resin is used, the distortion with the vinyl chloride due to the shrinkage rate after curing is considered, and the ultraviolet curable resin layer There is a problem that it is not possible to obtain a sufficient three-dimensional effect because it is difficult to coat the UV-curable resin layer on the protrusions too thick unless there is a limit to the thickness of the . Further, since the surface is the surface coated with the ultraviolet curable resin, there is a problem that the surface property is inferior to that of the extruded film.

As the thermoplastic film used in (1), (2) and (3), vinyl chloride resin is a large number, but the vinyl chloride resin generates chlorine gas during incineration, acid rain, and dioxins. It is said that this is a cause of generation, and from the viewpoint of environmental problems, a decorative sheet that does not use a vinyl chloride resin sheet is being demanded. However, for resin sheets other than vinyl chloride resin, the balance of appropriate flexibility, embossability, abrasion resistance, surface hardness, chemical resistance, stain resistance, weather resistance, etc. possessed by the vinyl chloride resin sheet, which is particularly required in the field of building materials, is required. There was nothing that satisfied the excellent properties.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the problem is that the surface is smooth without using vinyl chloride resin. It is to provide a decorative sheet with an uneven surface inside.

[0006]

In order to solve this problem, the present invention provides a transparent olefinic thermoplastic resin having a smooth surface by filling the irregularities on a colored olefinic thermoplastic resin sheet having irregularities. It is intended to provide a decorative sheet having an unevenness inside, which is characterized by being formed by laminating sheets, and as a manufacturing method thereof, a colored olefin thermoplastic resin is applied to a cooling roll having an uneven pattern on the surface. Melt extruding, cooling and solidifying to form a sheet having unevenness, and then melt-extruding a transparent olefinic thermoplastic resin between the uneven surface of the sheet and a cooling roll having a smooth surface to be integrated. It is characterized by.

The present invention will be described in detail below with reference to the drawings. FIG. 1 schematically shows the structure of a decorative sheet having an unevenness inside according to the present invention. The colored olefin-based thermoplastic resin 1 is not particularly limited as long as it is a material other than vinyl chloride and can be easily melt-extruded and molded, but a polyolefin-based elastomer or the like is particularly preferable.

The coloring of the resin is not particularly limited, but the use of a masterbatch colored with a metal powder in a resin of the same type as the extruded resin does not give consideration to the properties of the sheet.
desirable.

Although the thickness of the sheet is not particularly limited, it is preferably about 50 to 200 μm in consideration of thinning the entire sheet and clearly expressing irregularities.

The depth of the unevenness 2 is not particularly limited as long as a sufficient feeling of unevenness can be obtained, and it is preferably about 20 to 150 μm although it depends on the balance with the sheet thickness.

The transparent olefinic thermoplastic resin 3 is not particularly limited as long as it can be easily melt-extruded and molded as described above. This resin must be transparent so that the irregularities 2 of the colored olefinic thermoplastic resin can be seen through the layer.

The thickness is not particularly limited, but in consideration of the thickness of the entire sheet and the parallax for obtaining a three-dimensional effect from the smooth surface, the thickness of the uneven surface is 50 to 20.
It is preferable that the thickness is about 0 μm.

An example of the method for producing a decorative sheet according to the present invention will be described below in detail. FIG. 2 shows steps of one embodiment of the manufacturing method. The olefin-based thermoplastic resin colored by the melt extruder 5 is melt-extruded between the cooling roll 8 and the back-up roll 7 having unevenness on the surface, and cooled and solidified by the cooling rolls 9 and 10 to form a sheet having unevenness. After molding, another melt extruder 6 installed on the same line
A more transparent olefinic thermoplastic resin, cooling roll 1
1 is melt-extruded between the uneven surface of the sheet and the cooling roll 12 having a smooth surface, and the cooling rolls 13 and 14 are provided.
Then, it is cooled and solidified and wound up by a winding roll 15.

Further, depending on the kind of the thermoplastic resin, if it is not adhered only by melt-extruding or if the adhesion is weak, it is advisable to provide a primer layer between them or perform corona treatment if necessary.

[0015]

[Function] As described above, the effect of the sharp, deep uneven pattern obtained by embossing the thermoplastic resin in the molten state has a three-dimensional effect with an uneven feeling inside, and further addition. As a result, it is possible to obtain a decorative sheet having excellent surface properties and transparency of the transparent resin layer.

[0016]

Example: 90 parts by weight of polypropylene resin and a brown-colored polypropylene resin as a masterbatch (metal powder composed of titanium oxide and iron oxide (compound depends on color) 6
10 parts by weight (containing 5% by weight) was mixed and melt-extruded by a melt extruder shown in FIG. 2 at a melting temperature of 240 ° C. onto a cooling roll having an uneven pattern. This is line speed 1.
Connect to another melt extruder on the same line at 5 m / min. A transparent polypropylene resin was melt-extruded at a melting temperature of 240 ° C. between the concavo-convex surface of the sheet and the cooling roll having a smooth surface.
The obtained sheet was a cosmetically excellent decorative sheet in which the surface was smooth but the colored layer was seen through the transparent layer.

[0017]

As described above, according to the present invention, it is possible to obtain a decorative sheet which has a clear deep concave and convex inside and has a three-dimensional impression and is excellent in design. Further, since no vinyl chloride resin is used, it is a preferable decorative sheet from the viewpoint of environmental protection.

[0018]

[Brief description of drawings]

FIG. 1 is an explanatory view of a cross section showing a configuration of a decorative sheet of the present invention.

FIG. 2 is an explanatory view of an apparatus showing an embodiment of a method for manufacturing a decorative sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Colored olefinic thermoplastic resin 2 ... Irregularity 3 ... Transparent olefinic thermoplastic resin 4 ... Decorative sheet with unevenness inside 5, 6 ... Melt extruder 7 ... Backup roll 8 ... Uneven surface Cooling roll 9, 10, 11, 13, 14 ... Cooling roll 12 ... Cooling roll with smooth surface 15 ... Winding roll

Claims (2)

[Claims] 1. An irregularity formed inside by laminating a transparent olefinic thermoplastic resin sheet having a smooth surface by filling the irregularity on a colored olefinic thermoplastic resin sheet having irregularities. A decorative sheet with a feeling. 2. A colored olefin-based thermoplastic resin is melt-extruded on a cooling roll having an uneven pattern on its surface, and cooled and solidified to form a sheet having unevenness. A method for producing a decorative sheet having an unevenness inside, comprising melt-extruding the sheet between the uneven surface of the sheet and a cooling roll having a smooth surface to be integrated.