JP3194403B2 - Decorative sheet having unevenness inside 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 decorative sheet used for decorative boards used in the field of building materials and the like and a method for producing the same, and more particularly to a decorative sheet having a textured interior and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a decorative sheet having a smooth surface and an uneven feeling, a (1) embossing process is used to impart an uneven pattern to the surface of a thermoplastic film, and a top coat is applied so as not to lose the unevenness. (2) A decorative sheet having an irregular pattern on the surface of the thermoplastic film by embossing and embedding ink to give a sense of depth, and (3) a colored decorative sheet. Embossing the thermoplastic film, applying UV curing resin on the uneven surface, filling the uneven surface, decorative sheet,
And so on.

[0003] In the case of providing a decorative sheet with an embossed pattern by embossing, there are many applications requiring a design property as described in the above (1) and (2). (3). However, in the case of (3), since the uneven shape due to embossing is not clear or the UV-curable resin is used, the UV-curable resin layer is considered in consideration of distortion with vinyl chloride due to the shrinkage after curing. There is a problem that it is difficult to apply a thick UV-curable resin layer on the convex portion unless the concave and convex portions are deeply introduced, so that a sufficient three-dimensional effect cannot be obtained. . Furthermore, since the surface is a surface coated with an ultraviolet curable resin, there is a problem that the surface property is inferior to that of an extruded film.

A large number of thermoplastic films used in (1), (2) and (3) are vinyl chloride resins. The vinyl chloride resin generates chlorine gas during incineration, acid rain, and dioxin. It is also said to be a factor of occurrence, and a decorative sheet not using a vinyl chloride resin sheet is being demanded from the viewpoint of environmental problems. However, in the case of resin sheets other than vinyl chloride resin, the balance of the appropriate flexibility, embossability, abrasion resistance, surface hardness, chemical resistance, stain resistance, weather resistance, etc. of the vinyl chloride resin sheet required especially in the field of building materials Nothing satisfies the good properties.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a liquid crystal display device having a smooth surface without using a vinyl chloride resin. An object of the present invention is to provide a decorative sheet having a sense of unevenness inside.

[0006]

According to the present invention, a colored olefin-based thermoplastic resin is coated on a surface of a resin.
Extrusion into a cooling roll with irregularities on the surface and solidification by cooling
After forming into a sheet with irregularities,
The thermoplastic resin is spread on the uneven surface and the surface of the sheet.
Melt extrusion with a smooth cooling roll
Characteristic method of manufacturing decorative sheet with unevenness inside
And there is a sense of irregularities inside manufactured according to the manufacturing method
And a decorative sheet.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows the structure of a decorative sheet having an uneven feeling inside the present invention. The colored olefin-based thermoplastic resin 1 is not particularly limited as long as it is easy to mold by melt extrusion, other than vinyl chloride, but a polyolefin-based elastomer is particularly suitable.

[0008] The coloring of the resin is not particularly limited, but using a master batch in which a resin of the same type as the extruded resin is colored with a metal powder can be used without considering 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 making the entire sheet thinner and clearly expressing unevenness.

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

The transparent olefin-based thermoplastic resin 3 is not particularly limited as long as it is easily extruded by melt extrusion in the same manner as described above. The resin must be transparent so that the irregularities 2 of the colored olefinic thermoplastic resin can be seen through the layer.

Although the thickness is not particularly limited, considering the thickness of the entire sheet and the parallax for obtaining a three-dimensional effect from the smooth surface, the thickness of the projection is preferably 50 to 20 from the projection of the uneven surface.
The thickness is preferably about 0 μm.

Hereinafter, an example of the method for producing a decorative sheet according to the present invention will be described in detail. FIG. 2 shows the 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 backup roll 7 having an uneven pattern 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 provided on the same line
More transparent olefin-based thermoplastic resin
1 is melt-extruded between the uneven surface of the sheet and the cooling roll 12 having a smooth surface.
And solidified by cooling.

Further, depending on the type of the thermoplastic resin, if the melt-extrusion does not provide a close adhesion, and if the adhesion is weak, it is preferable to provide a primer layer between them or to perform a corona treatment as necessary.

[0015]

As described above, the effect of the sharp and deep unevenness pattern obtained by embossing the thermoplastic resin in a molten state has a three-dimensional effect having an unevenness inside, and Accordingly, 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 a polypropylene resin and a brown colored polypropylene resin as a master batch (metal powder composed of titanium oxide and iron oxide (compounding depends on color))
The mixture was melt-extruded with a melt extruder shown in FIG. 2 at a melting temperature of 240 ° C. onto a cooling roll having an uneven pattern. This is called line speed 1.
Connect to another melt extruder running on the same line at 5 m / min. Then, a transparent polypropylene resin was melt-extruded between the uneven roll surface and the smooth roll surface of the sheet coming on the cooling roll at a melting temperature of 240 ° C.
The obtained sheet was a decorative sheet excellent in design in which a transparent layer was formed and colored irregularities were observed inside, while the surface was smooth.

[0017]

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

[0018]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram 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 one embodiment of a method for producing a decorative sheet of the present invention.

[Description of Signs] 1 ... Colored olefin-based thermoplastic resin 2 ... Unevenness 3 ... Transparent olefin-based thermoplastic resin 4 ... Decorative sheet with unevenness inside 5,6 ... Melting extruder 7 ... Backup roll 8 ... Surface Cooling rolls with uneven patterns 9, 10, 11, 13, 14 ... Cooling rolls 12 ... Cooling rolls with smooth surface 15 ... Winding rolls

Claims (2)

(57) [Claims] 1. A colored olefin-based thermoplastic resin comprising:
It is melt-extruded on a cooling roll with an uneven surface,
After forming into a sheet with irregularities,
The thermoplastic resin is applied on the uneven surface and the surface of the sheet.
Melt extrusion with a smooth cooling roll to integrate
How to manufacture a decorative sheet with a feeling of unevenness inside
Law. 2. A manufacturing method according to claim 1.
A decorative sheet with a textured interior.