JPH04187500A - Decorative sheet with recessed and projected patterns on top and rear surfaces and production thereof - Google Patents

Abstract

PURPOSE:To obtain a good-design decorative sheet with recessed and projected patterns on its top and rear surfaces at a low cost by a method wherein the recessed and projected patterns on its top and rear surfaces are respectively thermally embossed at different film surface temperatures. CONSTITUTION:A decorative sheet 1 with recessed and projected patterns on its top and rear surfaces is provided with a thermoplastic resin film 2 having recessed and projected patterns 3, 4 at least on its top and rear surfaces. The top-side recessed and projected pattern 3 and the rear-side recessed and projected pattern 4 are thermally embossed at different film surface temperatures Furthermore, the decorative sheet 1 is provided with a glossy printing layer 6 and a pattern printing layer 5 on the rear surface of the thermoplastic resin film 2. On the top surface of the thermoplastic resin film 2, the recessed pattern 3 is filled with wiped ink 7. The surface is further covered with a protective layer 8. An embossing temperature may be between the softening point or thermally deforming temperature of the thermoplastic resin film and the melting point or fusing temperature thereof. In this manner, sharply recessed and projected patterns can be positively embossed on the both surfaces.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a decorative sheet having at least a thermoplastic resin film having an uneven pattern by embossing on both the front and back surfaces, and a method for manufacturing the same [Prior art] 2. Description of the Related Art Decorative sheets have been known that have improved decorative properties by forming an uneven pattern on the surface of a base sheet.

For example, as a decorative sort, there is a woodgrain decorative sheet with a wood grain printing pattern and an uneven pattern consisting of a group of parallel curves such as wavy curves to create a natural shine.Such decorative sheets are used for building materials and furniture. It is widely used to give the texture of wood to surfaces such as wood.

As a method for forming the uneven pattern of the decorative sort having the above-mentioned uneven pattern, there is a method using embossing. To give the uneven pattern by embossing, for example, an embossing plate corresponding to the desired uneven pattern is used, a thermoplastic resin film is used as the base sheet, and the surface of the film is heated and softened to correspond to the uneven pattern. Apply pressure to the embossing plate,
This is a method of forming and transferring an uneven pattern onto the surface of a thermoplastic resin film.

As one of the decorative sorts provided with the above-mentioned embossed uneven pattern, a decorative sheet with an uneven pattern provided on both the front side and the back side is used in order to further improve the design.

This decorative sorting having a concavo-convex pattern on both the front and back sides is, for example, 1) two sheets with a concavo-convex pattern on one side pasted together using a method such as dry lamination, or 2) an embossed plate used for normal embossing. It is known that the impression cylinder used for the opposite side is replaced with a printing cylinder, and the embossing plate for the back side is made into a decorative sheet by simultaneously applying the embossing on the front side and the embossing on the back side to one sheet.

[Problems to be Solved by the Invention] However, in the case where the above-mentioned conventional decorative sheet uses two sheets as described in 1), it is difficult to make two sheets with embossments formed on the front side and the back side. There was a problem that the cost would increase. Furthermore, laminating them together has many problems, such as complicated work and time-consuming manufacturing, and the concave-convex pattern is likely to disappear during the laminating process.

-4, 2) In the method of applying embossing to both sides of one sheet, the embossing is applied between two hard metal plates with the sheet sandwiched between them, so the formability of the embossing is difficult. bad. For this purpose, there are methods such as changing the printing plate on the impression cylinder side to a rubber printing plate, but since embossing using a rubber printing plate cannot reproduce the shape of a sharp uneven pattern,
It has been difficult to obtain a decorative sheet in which both sides of the sheet are provided with a sharp uneven pattern by embossing.

The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art, and provides a decorative sheet with an excellent design that has an uneven pattern on both the front and back sides at a low cost, and a method for easily and reliably manufacturing the decorative sheet. The purpose is to provide

[Means to solve the problem]

The present invention provides a decorative sheet made of a thermoplastic resin film having an uneven pattern on at least both the front side and the back side, in which the uneven pattern on the front side and the back side is formed by heat embossing at different film surface temperatures. This is a decorative sheet having an uneven pattern on both the front and back sides.

In the above decorative sorting, the present invention provides a pattern layer and/or a glittering layer on the front side and/or back side of the thermoplastic resin film, and the uneven pattern on the front side of the thermoplastic resin film is made into a wood grain conduit pattern. The uneven pattern on the back side can also be a wavy curve.

The present invention also provides a method for forming a pattern printing layer with a woodgrain pattern on the back side of a thermoplastic resin film so as to cross the flow direction of a concavo-convex pattern consisting of wavy curves, or applying wiping ink to the concave-convex pattern consisting of a wood grain conduit pattern. layers can be provided.

Further, in the present invention, a protective film 1g can be provided on the surface side of the thermoplastic resin film of the above decorative sheet.

In addition, the present invention provides an uneven pattern on one side of a thermoplastic resin film by heat embossing, and then performs an auxiliary embossing process on the other side at a lower surface temperature than that applied to the one side. This is a method for producing a decorative sheet having an uneven pattern on both the front and back sides, which is characterized in that a pattern is provided on both sides.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, the decorative sort 1 of the present invention having an uneven pattern on both the front and back sides has a thermoplastic resin film 2 provided with an uneven pattern 3.4 on at least both the front side and the back side. , uneven pattern 3 on the front side and uneven pattern 4 on the back side
are formed by heat embossing at different film surface temperatures.

Furthermore, the present invention decorative saw) 1 is provided with a glitter printing layer 6 and a pattern printing layer 5 on the back side of the thermoplastic resin film 2,
Further, the surface side of the thermoplastic resin film 2 is filled with a wiping ink 7 in an uneven pattern 3, and the surface is further covered with a protective layer 8. Note that the glitter printing layer 6 and the pattern printing layer 5 may be provided not only on the back side but also on the front side, and may be provided entirely or partially.

The thermoplastic resin film 2 is not particularly limited as long as it is translucent, and its material, thickness, etc. are appropriately selected depending on the intended use of the decorative sheet 1.

For example, the thermoplastic resin film 2 is typically made of polyvinyl chloride, and other materials include cellulose resin, polyolefin, polyester, polyvinyl chloride, polystyrene, polycarbonate, polyvinyl alcohol, and polyamide. The thickness of the thermoplastic resin film 2 is 0.0
A range of 5 to 0.2 wth is preferred because it is easy to handle.

For example, when a polyvinyl chloride film is used as the thermoplastic resin film, a method such as photo-etching may be used to impart an uneven pattern to the front and back surfaces of the thermoplastic phase resin film 2 at different temperatures. Using an embossed plate having an uneven pattern, a thermoplastic resin sheet is heated to 150°C to 170°C, and the embossed plate is brought into contact with the embossed plate under pressure to give an embossment, thereby forming an uneven pattern 3 on the surface side. Form. Next, using an embossing plate corresponding to the uneven pattern 4 on the back side, heat the thermoplastic resin sheet to the back side of the polyvinyl chloride resin film at a temperature of 90 to 1.
Embossing is performed at 30°C in the same manner as on the front side to form the uneven pattern 4 on the back side.

In the present invention, it is important to form an uneven pattern on both sides of one sheet by performing embossing at different embossing temperatures on the front side and the back side.

In the present invention, the embossing temperature may be a temperature between the softening point or heat distortion temperature (secondary transition temperature) and the melting point or melting temperature (-secondary transition temperature) of the thermoplastic resin film used. The first embossing temperature is heated to a temperature close to the primary transition temperature of the thermoplastic resin film, and the thermoplastic resin film is embossed and cooled to harden in a state where it has lost its elasticity. Therefore, the emboss shape of the first emboss is not lost until that temperature (first emboss temperature) is reached. The subsequent embossing temperature is heated to a temperature slightly exceeding the second-order transition temperature (glass transition temperature) of the film, and when the thermoplastic resin film has softened, it is embossed and cooled to harden.

In other words, when the initial and subsequent embossing temperatures are set as described above, the second-order transition temperature of the thermoplastic resin film is lower than the first-order transition temperature, so the subsequent embossing is performed at a temperature slightly higher than the second-order transition temperature of the thermoplastic resin film. Even when formed, the initial embossed shape formed at a temperature close to the -order transition temperature is not lost.

The uneven pattern 3.4 used in the decorative sheet of the present invention can be of various types. Examples of the uneven pattern include those that reproduce the uneven shape of natural objects such as wood grain, stone grain, cloth grain, sand grain, character symbols, parallel lines, various abstract patterns, various matte surfaces, mirror gloss, and the like.

In particular, patterns such as those shown in FIGS. 2(a) to (ei) can be used as the uneven pattern provided to give the decorative sheet a glossy appearance.Patterns of parallel curve group 12 (
(a), (e), (d)) or parallel curve group 1
2 and a group of parallel straight lines 13 (see figure (b)), or a non-parallel pattern in which the interval between each curve changes smoothly in the direction of the line by changing the function parameters of the function curve. It consists of a group of curves 14 (FIG. 2(e)) and the like.

The above-mentioned parallel curve groups include function curves such as sine wave curves, cycloid curves, elliptic function curves, and henocel function curves, and curve units such as circular arcs that are connected and arranged in parallel to each other. . The pattern shown in the second circle (d) is a collection of line groups having parallel curve groups in each region surrounded by the contour line, and the shape or line of the contour line and the parallel curve group. This is an example in which the directions are formed to be different for each contour area.

Moreover, the pattern consisting of the non-parallel curve group 14 shown in FIG. 2(e) is based on the wavelength, phase, and
Each parameter of the curve expressed by a formula that divides each parameter difference of period and Y coordinate into N equal parts is 0.1...N-1, N
This is a group of non-parallel curves formed from N+1 curves shown in the case where

This creates partially sparse areas and dense areas, and the illumination changes depending on the viewing angle.

It is preferable that the above line group patterns are formed into a groove-like uneven shape in which the width of the recesses and the width of the projections in the cross-sectional shape are 1 to 1000 μm, in order to bring out the shine of the natural material.

Further, the depth of the recess is usually about 1 to 100 μm, and more preferably 35 to 25 μm. Furthermore, the depth of the concave portion is not uniform, but is varied regularly (stepwise) for each divided area by appropriately sagging, so that the area S
:Thus, it is possible to create a locked appearance in which the glare changes subtly.

The pattern printing layer 5 is appropriately selected depending on the design content to be imparted on the decorative sheet. For example, wood grain pattern,
It is possible to provide a pattern printing layer, a colored layer, etc., which is made of a surface pattern such as a woven fabric such as a stone pattern or a silk pattern. For example, by providing a woodgrain pattern print layer 5 on the surface side and combining it with a concavo-convex pattern, it is possible to create a woodgrain appearance that gives off a desired shine. In particular, in order to faithfully reproduce the shine of a straight-grained wood surface, as shown in Section 3, it is necessary to
It is preferable to form the concavo-convex pattern 18 so as to intersect with the flow direction (direction of the arrow in the figure) of the concavo-convex pattern 18 consisting of a wavy curve. In particular, it is more preferable to provide the concavo-convex pattern 18 and the pattern printing layer 17 so as to intersect with each other so as to be substantially orthogonal to each other.

The pattern printing layer 5 contains vinyl resin, acrylic resin, nitrocellulose, aminoalkyd resin,
It can be formed on the thermoplastic film 2 by using known printing means such as gravure printing, flexo printing, screen printing, etc. using ink made of butyral resin or the like with pigments dispersed therein.

The glitter printing layer 6 can be formed by metal vapor deposition, edge printing or pattern printing using an ink containing a glitter pigment. The metals used for vapor deposition are aluminum, chromium,
Commonly used materials such as copper may be used.

Specific examples of glittering pigments include: ■ Burl pigments, specifically crushed inner parts of seashells or pearls, microparticles of mica baked with titanium oxide or iron oxide, ■ Metal powder, specifically copper, aluminum,
Fine particles of brass, bronze, gold, silver, etc., preferably 1 to 120 μm in size, ■ Pieces of vapor-deposited plastic film, such as polyethylene terephthalate film with the above metal (3M usually aluminum) vapor-deposited and crushed ( There are two types of powder: silver powder), and powder that is coated with a transparent yellow coating and crushed (all-colored powder).

The ink used for the glitter printing layer 6 can be appropriately selected from among the above-mentioned resins as a vehicle, similarly to the pattern printing layer 5, and may be one to which the above-mentioned glitter filler is added. The glitter printing layer 6 can be formed by the above-mentioned known printing method, which is the same as that for the pattern printing layer.

When the pattern printing layer 5 or the glitter printing layer 6 is provided on the surface side of the thermoplastic resin film 20, it is preferable to use a curable ink containing a thermosetting resin or an ionizing radiation curable resin as a vehicle.

The protective layer 8 is preferably formed of a colorless or colored transparent resin having excellent abrasion resistance, stain resistance, etc. For example, thermosetting resin,
Ionizing radiation-curable resins, fluorocarbon resins, and the like are suitable, and acrylic resins, aminoalkyd resins, polyurethane resins, and the like can also be used. The thickness of the protective layer 8 is formed to be 0.5 to 10 μm, preferably 2 to 5 μm.
It is.

In manufacturing the cosmetic sheet of the present invention) 1, necessary layers (for example, a pattern printing layer, a glitter printing layer) are provided on the thermoplastic resin film 2 by printing, and the above-mentioned layers are applied to the front and back sides by heat embossing. A concavo-convex pattern is provided using the method described in the following. still,
The above printing process and embossing process may be performed in any order.

The decorative sheet 1 of the present invention having an uneven pattern on both the front and back sides can be used to obtain beautiful decorative plywood by adhering the uneven pattern 4 side on the back side to various adherends. The object to which the decorative sheet 1 can be attached may be any object that is normally used as a base material for decorative materials. Specific examples include single sheet paper, bleached kraft paper, titanium paper,
Return paper, paperboard, raw vinyl wallpaper, paper such as gypsum board paper, wood base materials such as wood, plywood, verticle board, gypsum base materials such as gypsum board and gypsum slag board, iron plates, galvanized steel plates, Examples include metal plates such as vinyl chloride sol coated steel plates, copper plates, and aluminum plates.

Next, the present invention will be explained in more detail by giving specific examples.

Example 1 A wood grain pattern was printed on one side of a 130 μm thick polyvinyl chloride sheet using gravure ink (Moryo Ink@g,y MC). Furthermore, a glitter printing layer was formed on the printed surface using a gravure ink containing a pearl pigment (VMC Pearl, manufactured by Moroyo Ink Co., Ltd.).

On the other side of the sheet, a concavo-convex pattern with a depth of 50 μm in the shape of a wood grain conduit pattern was provided at a drum temperature of 165° C. and a speed of 1 Om/1II in. Furthermore, embossing was performed on the glitter printing surface at a drum temperature of 120°C and a speed of 14n+/min to form an uneven pattern with sine curve-shaped recesses (depth 12μm and width 35μm) arranged at 70μm intervals. Concave and convex patterns on both sides. Furthermore, a wiping treatment was applied to the surface provided with the uneven pattern of conduit embossing to obtain a decorative sheet of the present invention.

The obtained decorative sheet had a good uneven pattern on the front and back sides,
The luster of the wood grain was sufficiently expressed, and the appearance was similar to that of natural wood with excellent three-dimensionality.

〔Effect of the invention〕

As explained above, the decorative sheet of the present invention having an uneven pattern on the front and back sides is different from the conventional one because the uneven patterns on the front side and the back side are formed by heat embossing at different film surface temperatures. Compared to a decorative sheet formed by bonding two sheets together, the decorative sheet can be formed from a single sheet and is superior in terms of cost and inexpensive. Furthermore, in that case, a sharper uneven pattern can be obtained compared to the conventional uneven pattern formed on a single sheet by embossing.

Further, when a pattern layer and/or a glitter layer is provided on the surface side and/or the surface side of the thermoplastic resin film, the design of the decorative sheet can be further improved.

Furthermore, the uneven pattern on the front side of the thermoplastic resin film may be a wood grain conduit pattern, and the uneven pattern on the back side may be a wavy curved line, or the pattern printed layer with a wood grain pattern may be formed on the back side of the thermoplastic resin film from a wavy curved line. By forming the concavo-convex pattern so as to intersect with the flow direction, it is possible to obtain a beautiful woodgrain appearance with a natural appearance and shine similar to that of real wood. Further, by providing a wiping ink layer in the concave portions of the uneven pattern consisting of the wood grain conduit pattern, a realistic design closer to that of the wood grain conduit can be imparted.

In addition, by providing a protective layer on the surface side of the thermoplastic resin film of the decorative sheet of the present invention, it is possible to protect the uneven pattern on the surface side, so there is no risk of foreign matter such as dust getting into the recesses or the pattern etc. There is no risk of staining, and the shine and beauty will not be impaired.

In addition, the method for manufacturing a decorative sheet having an uneven pattern on both the front and back surfaces of the present invention includes providing an uneven pattern on one side of a thermoplastic resin film by heat embossing, and further applying the surface temperature applied to the above-mentioned one side to the other side. By adopting a method that applies heat embossing at a lower surface temperature compared to the surface temperature to give the uneven pattern on both sides, the embossing temperature for the uneven pattern to be formed later is the same as the embossing temperature for the uneven pattern to be formed initially. Since the temperature difference is relatively low, subsequent embossing can be applied without erasing the initial uneven pattern, and a sharp uneven pattern by embossing can be reliably imparted to both sides.

In addition, according to this manufacturing method, it is possible to give unevenness by embossing on both sides of one sheet, and the work of manufacturing decorative sorting can be easily performed without the need to paste two sorting sheets together. have an effect.

[Brief explanation of drawings]

Fig. 1 is an example of a decorative sheet having an uneven pattern on both the front and back sides, Fig. 2 (a) to (e) are plan views showing examples of line group patterns of the uneven pattern, and Fig. 3 is a wood grain pattern. FIG. 3 is a plan view showing an example of a combination of a printed layer and a concavo-convex pattern consisting of a group of wavy curves so as to intersect with each other. 1... Decorative sheet having an uneven pattern on both the front and back sides 2...
・Thermoplastic resin film 3...Irregular pattern on the front side 4...Irregular pattern on the back side 5...Picture printing layer 6...Glitter printing layer 7...Wiping treatment ink 8...Protective layer No. Figure 1 Figure 2 (a) (b) 1\13 (c) (d) (e)

Claims (7)

[Claims] (1) In a decorative sheet made of a thermoplastic resin film having an uneven pattern on at least both the front side and the back side, the uneven pattern on the front side and the back side is formed by heat embossing at different film surface temperatures. A decorative sheet having an uneven pattern on both the front and back sides. (2) The decorative sheet having an uneven pattern on both the front and back surfaces according to claim 1, which has a pattern layer and/or a glitter layer on the front side and/or back side of the thermoplastic resin film. (3) The decorative sheet having an uneven pattern on both the front and back surfaces of the thermoplastic resin film according to claim 1, wherein the uneven pattern on the front side of the thermoplastic resin film is a wood grain conduit pattern, and the uneven pattern on the back side is a wavy curve. (4) The decorative sheet having an uneven pattern on both the front and back surfaces according to claim 3, wherein the woodgrain pattern printed layer is formed on the back side of the thermoplastic resin film so as to intersect the flow direction of the uneven pattern consisting of wavy curves. (5) The decorative sheet having an uneven pattern on both the front and back sides according to claims 3 to 4, wherein a wiping ink layer is provided on the uneven pattern consisting of a wood grain conduit pattern. (6) A decorative sheet having an uneven pattern on both the front and back surfaces of claims 1 to 5, wherein a protective layer is provided on the surface side of the thermoplastic resin film. (7) A concavo-convex pattern is formed on one side of the thermoplastic resin film by heat embossing, and then a concave-convex pattern is formed on the other side by heat embossing at a lower surface temperature than that applied to the single side. A method for producing a decorative sheet having a concavo-convex pattern on both the front and back sides, characterized in that the decorative sheet is provided on both sides.