JPH04316900A - Woodgrained decorative sheet - Google Patents

Abstract

PURPOSE:To provide a low cost woodgrained decorative sheet which appears to be a real wood with a shining touch and is free from any chromatic blur due to the background when the sheet is attached to plywood. CONSTITUTION:The title woodgrained decorative sheet 1 consists of transparent thermal plastic resin films 5 with a fine threadlike uneven pattern 4 of fine wavey curves on the surface laminated on the surface of a colored thermal plastic resin film 3 with a woodgrain pattern printed layer 2 formed on the surface. The colored thermal plastic resin film 3 is laminated on the transparent thermal plastic resin film 5 in one piece, and at the same time, the fine threadlike uneven pattern 4 is formed on the surface of the transparent thermal plastic resin film 5 using an embossing plate with the fine threadlike uneven pattern 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative wood grain sheet.

0002

[Prior Art] Conventional wood grain decorative sheets are produced by printing a wood grain pattern on the surface of a base sheet and embossing it on the surface of a thermoplastic resin film such as a transparent vinyl chloride sheet using an embossing roll having a wood grain pattern. It was formed by laminating a base sheet and an embossed sheet. However, since it does not have the shine that real wood has, we have developed an improved woodgrain decorative sheet: 1) A woodgrain pattern is printed on the back side of a transparent PVC sheet, and a fine wave pattern is created on the printed surface. A decorative sheet with an uneven pattern (Japanese Patent Application No. 206449), or a colored sheet pasted on the back side of the above decorative sheet. 2) A transparent sheet with wood grain printing and a colored sheet with fine irregularities are dry laminated and pasted together (
Patent application No. 2-175742). etc. have been proposed.

0003

[Problems to be Solved by the Invention] However, in the case of the above-mentioned conventional decorative sheet, the color of the base plywood to which it is attached affects the color of the decorative sheet, and the decorative sheet is attached to the front side. There was a problem in that the color of the product was not constant when viewed from above. In addition, when a colored sheet is pasted to the back side of the decorative sheet to provide concealment properties, the embossment consisting of fine wavy irregularities is on the inside of the sheet, so the embossment becomes visible through the colored sheet. As a result, the illumination effect of the wave-like unevenness cannot be fully demonstrated. In addition, in the case of 2) decorative sheets, bonding two thermoplastic resin sheets together by dry lamination is extremely expensive, and there is also the risk of air bubbles being mixed in at the adhesive interface and the sheet swelling due to solvent. There were problems such as the uneven pattern was attenuated and the effect of the wavy unevenness was not sufficiently exhibited. The present invention solves the above-mentioned drawbacks of the prior art, and provides a sufficient shine similar to that of real wood.
Furthermore, when pasted on plywood, etc., there will be no color blurring due to the underlying material.
The purpose is to provide a wood grain decorative sheet that is cost-effective.

0004

[Means for Solving the Problems] The wood-grain decorative sheet of the present invention is a transparent colored thermoplastic resin film having a wood-grain printing layer on the surface, and a transparent pattern having parallel line unevenness consisting of a group of fine wavy curves on the surface. A wood-grain decorative sheet in which thermoplastic resin films are laminated, comprising: integrating the lamination of the colored thermoplastic resin film and the transparent thermoplastic resin film; and forming a line unevenness pattern on the surface of the transparent thermoplastic resin film. This is done simultaneously by doubling using an embossed plate with a pattern of concave and convex lines. Further, it is preferable that the above-mentioned woodgrain decorative sheet is provided such that the line unevenness pattern consisting of a group of wavy curves is substantially perpendicular to the direction of grain flow in the woodgrain printing layer.

[0005]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The drawings show one embodiment of the present invention, and FIG.
FIG. 1 is a sectional view showing an example of the woodgrain decorative sheet of the present invention.

As shown in FIG. 1, the wood grain decorative sheet 1 of the present invention has a glitter layer 8 on the surface of a colored thermoplastic resin film 3 having a wood grain print layer 2 on the glitter layer 8. , a woodgrain decorative sheet in which a transparent thermoplastic resin film 5 is laminated with a parallel line unevenness pattern 4 consisting of a group of fine wave-like curves, a gloss adjustment layer 6, and a conduit printing layer 7 sequentially provided on the surface, The lamination and integration of the colored thermoplastic resin film 3 and the transparent thermoplastic resin film 5 and the formation of the line unevenness pattern 4 on the surface of the transparent thermoplastic resin film 5 are carried out by doubling using an embossing plate having a line unevenness pattern. They are being done at the same time. Note that the glitter layer 8, gloss adjustment layer 6, and conduit printing layer 7 may be provided as necessary, and do not necessarily need to be provided.

[0007] The material of the transparent thermoplastic resin film 3 and the colored thermoplastic resin film 5 is mainly polyvinyl chloride, but other materials such as cellulose resin, polyolefin, polyvinyl alcohol, polyamide, etc. can be used. . The thickness of the thermoplastic resin fills 3 and 5 is preferably 0.05 to 0.2 mm. Further, the transparency of the transparent thermoplastic resin film may be any transparency that allows the patterns of the wood grain printing layer 2 and the glitter layer 8 to be seen, and includes translucent, colored transparency, and the like. The colored thermoplastic resin film 5 is made of the above-described film material with a pigment or coloring agent such as titanium oxide or carbon black added thereto in order to hide the color of the base material.

The line unevenness pattern 4 is made up of a collection of concave and convex portions forming grooves in the form of lines, that is, groups of parallel straight lines or groups of curved lines, and is provided to express the luster of the wood grain. It is. The line unevenness pattern 4 consists of a group of fine wavy curves. 3, 4, and 5 are plan views showing aspects of the wave-like curve group. The above-mentioned wave-like curve group is particularly effective when selecting a form using a curve group 13 in which a large number of wavy curves 12 such as sine waves are arranged in parallel as linear unevenness as shown in FIG. 3, for example. It is perfect for expressing the glow of the sun.

[0009] In addition to the above-mentioned sine wave curve, the wave-like curve group includes function curves such as an elliptic function, Bessel function, and cycloid, and measurement data curves such as audio signal waveforms measured with an oscilloscope. Further, the intervals between the respective curves may be the same or irregular.

In addition, in order to express the luster of root-knot wood (that is, knob-like, spot-like, knot-like, or spiral-like wood grain), a wavy curve is created in the area defined by the closed curve 14 as shown in FIG. It is preferable to use a line unevenness pattern having 15 lines. Figure 5
is an example of a closed curve area mosaic-like straight-line concavo-convex pattern, and this pattern has a straight-line groove in a region 17 divided by a closed curve 16, and two adjacent grooves with an arbitrary piece 18 interposed therebetween. A plurality of parallel lines 20 and 21 of sections 17 and 19 are connected so that the running directions are always different. This shape has a design in which each section appears to have a different glossy pattern, and the gloss of each section changes depending on the parallax. In addition, as another aspect, the boundary between adjacent regions may be a belt-like region (bank) in which no line-shaped grooves are formed. In this case, the boundaries between adjacent divided areas become clear, and it becomes easy to connect and modify unit areas during plate making.

FIG. 6 is a cross-sectional view showing an example of the line unevenness pattern. In particular, in order to recognize the line unevenness pattern 4 as a group of parallel straight lines or a group of curved lines as a pattern of changes in gloss, it is necessary to The depth 31 of the recesses and the widths 32 and 33 of the recesses and projections of the pattern 4 are preferably about 0.1 to 100 μm. In addition, the line unevenness pattern 4 has adjacent sections 17 and 19 shown in FIG.
It is preferable to form an angle of 5 degrees or more between the running directions of the lines in the area, and in order to ensure that the running directions of the lines in two sections adjacent to each other through any side are always different, it is necessary to According to the theorem of the four-color problem in science, four types of running directions are necessary and sufficient conditions.

FIG. 7 is a plan view showing an example of the wood grain printing layer 2. As shown in FIG. The wood grain printing layer 2 is provided on the surface of the colored thermoplastic resin film 3, mainly using a wood grain pattern as shown in FIG. 7, and is provided by a printing method such as gravure printing. Vehicles for the ink include vinyl resins, acrylic resins, nitrocellulose resins, aminoalkyd resins, butyral resins, etc., and a vehicle in which a pigment is dispersed is used. As a preferable embodiment of the wood grain printing layer 2 that more faithfully reproduces the shine of wood grain, the part where the shine appears is printed with ink containing a glittering pigment, or the back side of the wood grain pattern or the surface of the colored film is printed with glitter. It is best to use ink containing color pigments for solid printing. Figure 8 shows one of the combinations of a parallel line unevenness pattern consisting of a woodgrain print pattern and a group of wavy curves.
FIG. 3 is a plan view showing an example. As shown in FIG. 8, in particular, the wood grain printing layer 2 and the line unevenness pattern 4 are arranged in the traveling direction 41 of the wavy curve 10 (for example, the X-axis direction when Y=sinX),
When the running direction 42 of the wood grain printing layer 2 is made substantially perpendicular to the running direction 42, the movement of gloss when the line of sight is shifted is similar to that of natural wood (especially straight-grained wood).
is preferred because it is very similar to that of

In the decorative sheet 1 of the present invention, a gloss adjustment layer 6 can be provided on the surface of a transparent thermoplastic resin film 5, as shown in FIG. The gloss adjustment layer 6 is provided on the entire surface or in a pattern by a printing method such as gravure printing. The ink uses the same vehicle as the wood grain printing layer above,
A matting agent such as calcium carbonate or silica is dispersed, and the gloss can be adjusted by adjusting the amount of the matting agent added. The thickness of the gloss adjustment layer 6 is preferably 6 to 8 μm.

The conduit pattern printed layer 7 is a layer in which wood grain conduits are formed by gravure printing or the like, and the above-mentioned gloss adjustment layer 6
It can be formed using the same material as the ink vehicle used to disperse pigments and matte materials. In the decorative sheet of the present invention, by forming the above-mentioned gloss adjustment layer 6 to be glossy and forming the conduit pattern printing layer 7 to be matte, unevenness can be visually expressed without providing physical unevenness. is possible. In other words, the gloss provided on the decorative sheet
The glossy part and the matte part are a visual illusion, regardless of physical irregularities, because the glossy part appears to protrude and the matte part (the part of the conduit pattern printing layer 7) appears to be depressed.
The groove formed by the natural wood conduit can be expressed as a recess. Since the conduit pattern printing layer 7 is formed by printing, the registration of the concave portions and convex portions is more precise compared to the method of physically forming the concave and convex portions, and there is a problem that dirt easily accumulates in the concave portions. do not have.

Next, a method for manufacturing the wood grain decorative sheet of the present invention will be explained. FIG. 2 is an explanatory diagram showing an example of a doubling process which is a part of the manufacturing process of the woodgrain decorative sheet of the present invention. In the present invention, the colored thermoplastic resin film 3 and the transparent thermoplastic film 5 are laminated and integrated by doubling embossing, and the colored thermoplastic resin film 3 and the transparent thermoplastic film 5 are laminated and integrated by doubling embossing. The thermoplastic film 5 is characterized in that a line unevenness pattern 4 is formed on its surface. Doubling embossing is, as shown in Fig. 2, a transparent thermoplastic resin film 3 and a colored thermoplastic resin film 4, with the embossing roll 11 facing the transparent thermoplastic resin film 3 side, and the embossing roll 11 and a presser roll. Board 10
At the same time, the thermoplastic resin films 3 and 4 are sandwiched and bonded together using heat and pressure, and at the same time, a line unevenness pattern 4 is formed on the surface of the transparent thermoplastic resin film 4 on the embossing roll 11 side. It's a method.

The above-mentioned embossing roll 11 only needs to be formed with irregularities corresponding to the desired parallel-line irregularity pattern, and instead of the embossing roll 11, a sheet-shaped embossing plate (lithographic plate) may be used, although not particularly shown. . Emboss roll (
The material used for the embossed plate is an iron core plated with copper, which is then plated with chrome after forming a pattern of concave and convex lines using a method such as photoetching, electroforming, or milling. The processing conditions for the doubling embossing can be determined as appropriate depending on the material of the thermoplastic resin film used. For example, when a vinyl chloride sheet is used as the thermoplastic resin film, the temperature of the embossing plate is about 30 to 70°C, and the temperature of the thermoplastic resin film is about 120 to 170°C.

By pasting the wood grain decorative sheet 1 of the present invention onto plywood or the like with the colored thermoplastic resin sheet 3 facing downward, a beautiful wood grain decorative plywood can be obtained. The base material to which the decorative sheet 1 can be attached may be any material that is normally used as a base material for decorative sheets, and may be one whose surface is colored or has a pattern. Specific examples include paper such as tissue paper, bleached kraft paper, titanium paper, return paper, paperboard, gypsum board paper, wood, plywood, wood base materials such as particle board, iron plate, galvanized steel plate, copper plate, and aluminum plate. Examples include metal plates such as

Next, the present invention will be explained in more detail with reference to specific examples. Example 1 Colored vinyl chloride sheet (thickness 0.08 mm, plasticizer 23
A wood grain pattern was printed on the surface of a transparent vinyl chloride sheet (thickness: 0.08 mm, plasticizer: 23 phr: colored with PHR, pigment: manufactured by Riken Vinyl) (printing ink was "KaX": manufactured by Showa Ink). (manufactured by Riken Vinyl) were laminated and heated at a sheet heating temperature of 150°C using an embossing roll having a fine wavy pattern from the surface side of the transparent vinyl chloride sheet.
Embossing plate surface temperature 60°C, sheet feed speed 12m/m
Doubling embossing was carried out under conditions of in to form a parallel uneven pattern on the surface of the sheet, and at the same time, the colored vinyl chloride sheet and the transparent vinyl chloride sheet were laminated and integrated. Next, a gloss adjustment layer containing a matting agent was printed on the uneven pattern surface formed by the above-mentioned embossing using a gravure plate with a depth of 64 μm (the printing ink was "UM2").
4" and "UM24 Matte" with a reflectance of 2 at 75°C incident light.
0 or so: manufactured by Moroboshi Ink), and furthermore, a tube pattern is printed on the surface of the gloss adjustment layer (printing ink is "PT").
C": manufactured by Dainichiseika Chemical Co., Ltd.) to obtain a decorative sheet.

[0019]

Effects of the Invention As explained above, the wood grain decorative sheet of the present invention has a line unevenness pattern consisting of a group of fine wave-like curves on the surface of the colored thermoplastic resin film having a wood grain printing layer on the surface. Because it has a structure in which transparent thermoplastic resin films are laminated, the woodgrain decorative sheet itself is more attractive than conventional decorative sheets in which woodgrain printing is applied to the back side of a transparent sheet and an embossed pattern is formed on the printed surface. Because it has hiding properties against the base material, the color and design of the woodgrain printing layer is not affected by the color and pattern of the base material, and a beautiful woodgrain design can be achieved regardless of the color or pattern of the base material. It has a stable effect. In addition, the integrated lamination of transparent thermoplastic resin film and colored thermoplastic resin film,
Since the formation of the line unevenness pattern on the surface of the transparent thermoplastic resin film is done simultaneously by doubling using an embossing plate with the line unevenness pattern, it is possible to combine the transparent sheet with wood grain printing and the embossed sheet. Compared to conventional decorative sheets that are laminated by dry lamination, since no adhesive is used, lines may become uneven due to air bubbles entering the adhesive layer or swelling of the thermoplastic resin film due to the adhesive solvent. There is no risk of adversely affecting pattern attenuation. In addition, in the above-mentioned woodgrain decorative sheet, when the line unevenness pattern consisting of a group of wavy curves is provided approximately perpendicular to the grain flow direction of the woodgrain print layer, the gloss will shift naturally when the viewing direction is shifted. Wood (especially straight-grained wood)
It is possible to obtain a wood grain decorative sheet which is very similar to that of the above method and has an excellent design.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one example of the woodgrain decorative sheet of the present invention.

FIG. 2 is an explanatory diagram showing one example of a doubling step in the manufacturing process of the woodgrain decorative sheet of the present invention.

FIG. 3 is a plan view showing one aspect of a group of wavy curves.

FIG. 4 is a plan view showing one aspect of a wave-like curve group.

FIG. 5 is a plan view showing one aspect of a wave-like curve group.

FIG. 6 is a cross-sectional view showing an example of a line unevenness pattern consisting of a group of wavy curves.

FIG. 7 is a plan view showing an example of a wood grain printing pattern.

FIG. 8 is a plan view showing an example of a combination of a woodgrain print pattern and a line unevenness pattern consisting of a group of wavy curves.

[Explanation of symbols]

1　Woodgrain decorative sheet 2 Wood grain printing layer 3 Colored thermoplastic resin film 4 Line uneven pattern 5 Transparent thermoplastic resin film 11 Emboss roll

Claims (2)

[Claims] Claim 1: A wood-grain decorative sheet in which a transparent thermoplastic resin film having a line unevenness pattern consisting of a group of fine wavy curves is laminated on the surface of a colored thermoplastic resin film having a wood-grain printing layer on the surface. The integrated lamination of the colored thermoplastic resin film and the transparent thermoplastic resin film and the formation of the line unevenness pattern on the surface of the transparent thermoplastic resin film are performed by doubling using an embossing plate having the line unevenness pattern. A woodgrain decorative sheet characterized by being made at the same time. 2. The woodgrain decorative sheet according to claim 1, wherein the line unevenness pattern consisting of a group of wavy curves is provided to be substantially perpendicular to the grain flow direction of the woodgrain printing layer.