DE10100692A1 - Decorative film with three-dimensional effect, has an embossed dot pattern on the upper side and printed dot pattern on the underside - Google Patents

Abstract

Decorative film with three-dimensional effect, has an embossed dot pattern on the upper side and printed dot pattern on the underside. A transparent thermoplastic base film (10) has a visible structured upper side with a geometric pattern of embossed dots with convex caps (11). On the underside of the base film there is a printed pattern of colored dots (20). Both the embossed and printed dots have the same pattern but different pattern widths. Viewed from the upper side of the base film the axes of both upper and lower patterns run parallel to each other. An Independent claim is made for a process for manufacturing the 3-D film in which a transparent base film is drawn through a gap between an embossing roll and a counter roll to form a pattern of embossed dots with convex caps on the upper side. A patterned roll then applies a pattern of dots on the underside using a printing ink.

Description

The invention relates to a decorative film with a 3-D effect transparent thermoplastic and on a process for their Production.

From U.S. Patent 5,723,200 there is already a decorative film made from one transparent thermoplastic with 3-D effect known on a plurality of convex lenticular projections on its top having. There are figures in the same pattern on the back of the decorative film printed like the pattern of the projections on the top, but in the Pattern axes shifted against each other, creating a decorative film with a get iridescent effect according to the direction of observation becomes.

The invention has for its object to a decorative film with 3-D effect create that shows different stereo effects, including a strong one Movement effect should be achievable.

According to the invention, the object is achieved by forming a decorative film Claim 1 solved. A method of making one decorative film according to the invention with 3-D effect is according to the features of Claim 12 solved.  

Advantageous further developments of the decorative film according to the invention with a 3-D effect as well as the process for producing a decorative film with a 3-D effect characteristic features of the subclaims.

According to the invention, the decorative film with a 3-D effect comprises a transparent one translucent base film made of thermoplastic material, the as On the visible side of the decorative film, the upper side of the base film has an embossed structure in the form of a geometric dot embossing grid with a variety of has convex domes and a colored on the underside of the base film Print pattern in the form of a dot print screen is applied and for that Embossing screen and the printing screen have the same screen shape with each other different screen sizes are provided and the embossing screen and the Print screen in the top view of the base film viewed in arranged parallel to each other with respect to the axes of their grids are.

According to the invention, the embossed structure on the top of the Base film achieves a magnifying effect, like a magnifying glass. Prefers the tips causing the enlargement effect have a lenticular shape or pyramidal shape. The printing grid related to the embossing grid determines the size of the top view of the base film apparent hiking point. The 3-D effect according to the invention is by forming the dot print grid on the underside of the base film in the same grid arrangement as the stamping grid of the stamping structure, d. H. the crests on the top of the base film reached, being the same However, grid shapes are provided in different grid widths, However, the prerequisite for this is that the grids run parallel to one another, d. H. the axes of the Embossing grid and the printing grid run parallel.

A preferred grid shape for the embossing grid of the embossing structure and that colored dot print grid on the bottom of the base film is the arrangement the points in the hexagonal grid.  

In a preferred development of the decorative film, the point Print pattern on the underside of the base film from two or more dot Print screens of the same screen shape but different screen widths reassemble. For example, it is suggested that in the Bottom of the base film applied print pattern motif fields in the way train that the motif fields compared to the remaining area of the Print pattern, which forms the background field, with a dot print grid with one of the dot pitch of the print pattern of the To form background field deviating raster width. The motif fields can include figures such as triangles, circles, trees, animals, Hearts etc. In this way it is achieved that a another enlargement due to the embossed structure when looking at the base film against the background field of the print pattern arises and thus correspondingly movable points or point areas with different Sequence of movements between background field and subject field.

A further modification of the decorative film with 3-D effect can be done that on the underside of the base film before printing the print pattern as a dot print screen and / or afterwards a motif print with motifs translucent and / or opaque color is applied. Such a Motif printing with motifs, for example again from triangles, animals, Figures etc. are not made in the embossing grid or printing grid corresponding dot-screen printing, is therefore not subject to the 3-D effect and does not affect the 3-D effect. In the event that the motif print immediately is applied to the underside of the base film, it should be made of light translucent color to show the translucency of the applied behind To enable dot print rasters of the print pattern. It can with Dot print raster congruent motif fields of the print pattern be arranged with the applied motifs, so that the screened motif fields especially from the background field of the rest Lift off the print pattern.  

The decorative film according to the invention with a 3-D effect can now be applied additional layers on the underside of the base film above the print samples be supplemented. For example, a the cover layer covering the print pattern can be applied, whereby as A printing ink can be applied to the top layer, but it is a lighter one Color as the color of the print pattern should have a corresponding one To ensure contrast of the halftone dots of the print pattern. decorative films With a 3-D effect in this equipment, for example, as a table covering or Placemats and also without a top layer as a welding foil for the Baggage area, handbags or as laminating film for coating Foil, textiles, fleece, paper, leather fiber or other carriers for which Interior or exterior use in the automotive sector, as Furniture foils, e.g. B. for kitchen fronts or metal foil for Video housings of stereos, etc. are used. The Decorative film according to the invention can also be made with plastics or foamed or foam-molded plastics and molded parts be formed. In addition, it is also possible to use the invention Decorate decorative film with 3-D effect as self-adhesive film by clicking on the back cover layer a self-adhesive adhesive layer with peelable Protective film is applied.

For the transparent base film can be used as a thermoplastic, the is translucent, for example polyethylene, polypropylene, polystyrene, Polyester, polyamide, polyethylene terephthalate and biodegradable Materials, polyvinyl chloride, soft polyvinyl chloride or acrylic resins or Mixtures of the aforementioned materials are used. The basic foils are known processes such as calendering, extruding, blowing, Melt roll coating, in a thickness of 100 to 1000 µm depending on Application purpose manufactured. The embossing depth of the embossed structure of the crests the top should be 5 to 50% of the thickness of the base film, the minimal distance between the base points of neighboring crests so small should be as possible, in any case less than 15, preferably less than 10 % of the diameter of the crests. The larger the diameter of the crests,  the smaller the percentage distance between the base points of the Be hilltops, d. H. the area that has no magnification effect.

The minimum distance between the base points of the crests is preferred towards zero.

According to the invention, a sufficient 3-D effect is already achieved if the crests have a diameter at the base of 50 to 500 µm exhibit.

The thickness of the base film influences the 3-D effect only indirectly. The thickness of the Base film in connection with the embossed structure determines the contrast, d. H. the sharpness of the top view of the embossed top of the Basic film visible pressure points of the print pattern on the underside of the Base film. The 3-D effect depends on the structure of the embossing Relation to the thickness of the base film.

The embossed structure must have a magnifying effect like a magnifying glass, for this reason, convex crests are created in an embossed structure formed according to a grid of points on the top of the base film. There are webs between the crests, the larger these webs are, d. H. the wider the distance between the individual base points of the crests is too result in a cloudy print image in the reproduction of the 3-D effect. To one To obtain the smallest possible land area between the crests is called Dot grid for the embossed structure and the print pattern a hexagonal Structure preferred. Other geometric structures, such as. B. the are square arrangement of the dots as embossing grid and printing grid possible. According to the invention, the convex crests should be as free as possible Intermediate bars form the embossed structure.

The halftone dot of the print pattern can be circular or else other shape, such as oval, square, heart, triangle shape or the like exhibit.  

The combination of the print grid for the print pattern (dots) in the Connection with the embossing grid (crests) determines the size of the in the Top view of the base film visible, moving in the 3-D effect Pressure point of the print pattern.

The process for producing a decorative film with a 3-D effect can Be carried out in such a way that a transparent translucent Base film is made of a thermoplastic, for example by calendering, and then this base film by one of an embossing roll and a counter roll formed nip and here on their top with an embossed structure from a variety of convex domes in grid form and then the bottom of the Base film preferably online via at least one anilox roller for Applying a printing ink with a dot print screen and with a printing screen in the form of a dot printing screen is provided.

A print pattern with partial areas with different is preferred Screen rulings of the dot print pattern, with either an anilox roller with a print pattern with partial areas of different raster width used or two anilox rollers in succession for printing one each Printing ink can be used in dot form on the underside of the base film, the two anilox rollers each in complementary partial areas Show dot print screen, which is characterized by different screen widths different.

For example, the anilox rollers can have motif fields, with only an anilox roller the motif field, for example with a hexagonal Dot grid of 24 lines / cm grid and the rest of the surface of the Anilox roller with a hexagonal dot screen with 26 lines / cm screen is formed, with both grids parallel to each other in their axes run. When forming only one anilox roller with two different ones Only a single ink, i.e. H. Dots with one color but can be applied in different grid widths. In case that  the application of the pressure points in two different colors is desired, two anilox rollers are to be provided, one anilox roller in the Motif fields has the desired grid and remains otherwise free and the second roller outside the motif fields a desired grid having.

In addition, it is possible to increase the decorative effects that the Base film between the embossing roller and the first anilox roller over at least a motif printing roller for printing a motif from a transparent translucent ink is led to the bottom of the base film. According to a preferred embodiment, motifs corresponding to the intended motif fields applied and brought to cover. For the Achieving a good 3-D effect is the process for producing the Decorative film in such a way that the embossing grid of the embossing roller and the printing screen (s) of the anilox rollers have the same shape with different Have screen rulings and the print screen parallel to the embossing screen on the Base film is applied so that the axes of the different grids run parallel to each other.

The decorative film with 3-D effect comprising the base film can also varied by applying additional layers on the underside of the base film become. For example, the base film can be applied after the Print samples are guided over at least one additional inking roller, to apply a lighter colored top layer using printing ink. About that It is also possible to apply the base film after the printing pattern has been applied or after applying the top layer with an adhesive layer, in particular to coat or laminate self-adhesive adhesive layer. Also can be applied an adhesive layer, the outside with a removable protective film is covered.

In addition, the decorative film can be used as an outer layer for molded parts be, the decorative film z. B. injection molded with plastic or is foamed.  

The invention is explained below using the drawing as an example. Show it:

Fig. 1 shows schematically the cross-section of a decorative film with a 3-D effect,

Fig. 2 is a perspective view of part A of FIG. 1 on top of the decorative sheet,

Fig. 3 shows a variant of the decorative sheet of Fig. 1 with varied pressure pattern

Fig. 4 is a variant of the decorative sheet of Fig. 1 with varied patterns and design pressure

Fig. 5 shows a variant of the decorative film in education as a self-adhesive film,

Fig. 6, 7, 8 plan view of various decorative films with 3-D effect,

Fig. 9 Production scheme of a decorative film with a 3-D effect in accordance with Fig. 3 and 6,

Fig. 10-point screen roller for producing the decorative sheet of Fig. 9,

Fig. 11 production scheme of a decorative film with a 3-D effect in accordance with Fig. 4 and 7,

Fig. 12 motive roller for the manufacturing method according to Fig. 11,

Fig. 13 manufacturing method of a decorative film with a 3-D effect with two anilox rolls according to FIG. 3,

Fig. 14 point anilox rolls for the method of FIG. 13.

In FIG. 1, the decorative sheet 1 is fragmentary comprising the transparent light-transmitting base film 10, for example made of soft PVC, manufactured by calendering with a thickness d of 500 microns in cross-section. The top of the base film 10 has an embossed structure 11 , 12 , which consists of the lenticular convex domes 11 and the webs 12 running between them in a hexagonally arranged dot pattern, see schematic view according to FIG. 2. The embossing depth d1 of the embossing structure 11 , 12 is approximately 15 to 30% of the thickness d of the base film 10 , for example approximately 100 μm in the exemplary embodiment. The minimum distance a at the base of adjacent crests in the area of the webs 12 should be as small as possible, should approach zero if possible, and should preferably be less than 10% of the diameter of the crests at the base. The lenticular crests 11 should also be as small as possible, depending on the desired 3-D effect they can be flatter or steeper and their diameter b is about 300 μm in the example given the embossing depth. The embossed structure of the crests 11 forms a dot pattern, the dot pattern being arranged hexagonally with the axes X, Y, as can be seen from FIG. 2.

The colored print pattern in the form of a dot print screen 20 with the individual print dots is applied to the underside of the base film 10 according to FIG. 1. The print pattern has the same grid shape, namely a hexagonal dot grid like embossing grid 11 , 12 , and the embossing grid 11 , 12 and the printing grid 20 are arranged in the plan view arrow A of FIG. 1 with their grid axes X, Y running parallel to one another. Depending on the configuration of the lenticular crests, the print pattern 20 appears enlarged in the individual print dots and the print dots migrate with a correspondingly changing viewing direction in the top view onto the embossed top side of the base film 10 . The base film 10 including embossing and printed patterns form the decorative film 1 with a 3D effect.

To further vary the 3-D effect, the decorative film 1 , as shown in FIG. 3, is provided with a printing pattern with printing dots, partial areas, designated as motif fields 60 , being provided with a dot printing raster 20 ', the other Has raster width than the dot print raster 20 of the remaining partial areas of the print pattern. As a result of the different raster widths 20 , 60 of the print pattern on the underside in the area of the motif fields and the remaining background field of the base film 10 , the print points of the print patterns 20 , 60 appear in the top view of the base film 10 in different magnifications and at different speeds of the migration of the visible print points with a corresponding change in the viewing angle on the upper side of the base film 10 . FIG. 6 shows an excerpt of the top view of a decorative film, designed according to the principle of FIG. 3. The fine embossed structure 11 , 12 can be seen on the top of the decorative film 1 or base film 10 . On the underside of the decorative film 1 , the printed pattern 20 is printed as a background pattern with a dot print pattern of 26 L / cm, for example in blue color, in a hexagonal arrangement of the printed dots 20 with the axes X, Y. In the partial areas 60 , here in a triangular shape, also referred to as motif fields 60 , the print pattern 20 'is applied to the back of the base film 10 with a dot print screen of a raster width of 24 L / cm, likewise the print dots in blue color. The grid is also hexagonal and runs with the same axes X, Y as the background grid of the print pattern 20 and also parallel to the embossed grid 11 , 12 . Due to the different raster widths of the printed patterns 20 and 20 ′ printed on the underside of the base film, the corresponding pressure points appear enlarged in the illustrated top view as a result of the embossed structure of the top side of the base film 10 , namely enlarged differently. The reproduction is a two-dimensional reproduction, so that no change in the pressure points appears when the viewing angle is changed. However, this is the case with the original decorative film with a 3-D effect, where the dots migrate, namely at different speeds, the dots 20 of the print pattern with respect to the dots 20 'of the print pattern.

A further variation of the 3-D effect of the decorative film according to the invention is possible, for example, according to the diagram in FIG. 4, in that motifs 600 are printed on the underside of the base film 10 in full-tone printing, ie without the screening of the printing patterns 20 , 60 , however with a transparent translucent color. A print pattern 20 , 20 'with print dots in a grid arrangement, but different grid widths, is then applied to the underside of the base film 10, which is partially printed with motifs, as explained in FIG. 3. In this case, the arrangement of the motif fields 60 which are differently rastered from the background is preferably congruent with the printed motifs 600 . This emphasizes the 3-D effect, as can be seen, for example, from the illustration in the top view according to FIG. 7 on a decorative film 1 designed in this way . Here, the same screening of the print pattern as previously described in FIG. 6 is used with two dot screens 20 , 20 'of different screen rulings, however, in accordance with the motif fields 60, a motif print 600 is first applied to the underside of the base film in a transparent color, also as a triangle have been printed, for example in green with blue dots 20 , 20 '. In this way, the motif fields are highlighted in color.

FIG. 8 shows a decorative film with a 3-D effect in accordance with the basic structure of FIG. 4, whereby again, as already explained in FIGS. 6 and 7, motifs 600 , here fish, seahorses, first on the underside of the basic film a full-color printing, ie without a dot screen and then the print pattern with a dot print screen, specifically as a background screen 20 with a different screen size than the dot screen 20 'in the dot print screen assigned to the motif fields 60 and the motifs 600 . Both the embossed structure on the upper side of the base film 10 and the printing patterns with dot print screens 20 and 20 'of different screen widths on the underside of the base film 10 have a hexagonal arrangement of the dots, the axes X, Y of the print screen and the embossing screen being parallel to each other. Here, too, the pressure points of the grid of the motif fields 60 appear in a different enlargement corresponding to the different grid width than the other print points of the background field of the print pattern 20 , thereby enhancing the 3-D effect.

In FIG. 5 is a development of the decorative film 1 is shown with the print pattern and / or even a design print not shown, a cover layer 30 may be applied for example in white coloration on the back subsequently. A self-adhesive adhesive layer 40 and a peelable protective film 50 can be provided thereon or directly on the printed patterns 20 , 60 . Such a decorative film 1 according to FIG. 5 can be used, for example, as a self-adhesive film in many areas for decoration.

The dimensions of the illustrations of decorative foils shown in FIGS. 6, 7, 8 are as described for the base foil 10 according to FIG. 1.

The method for producing a decorative film with a 3-D effect, for example according to FIGS. 3 and 6, is shown schematically in FIG. 9. A base film 10, for example made of soft PVC by calendering is supplied to a pair of rolls having an embossing roll 101 and a backing roll 101 a and is provided when pulling through the nip on the top with the embossing pattern 11, 12th This is the embossed structure already explained in FIG. 1 with lenticular convex domes 11 and webs 12 , which bring about the magnification effect as a magnifying glass. Thereafter, the base film 10 embossed in this way on the top is fed directly to an anilox roller 104 with a counter roller 104 a, a printing pattern 20 , 20 ′ being applied to the underside of the base film 10 with a printing ink in a dot screen by means of the anilox roller 104 .

The anilox roller 104 , also referred to as a dot roller, has, for example, the raster formation shown schematically in FIG. 10 for the print pattern in the form of depressions 20 , 20 'and with the subfields 60 , the different raster widths being shown schematically in accordance with the different hatching. The second grid 20 ′ represents the motif field 60 within the remaining so-called background field.

According to FIG. 9, after passing through the base film 10 along the anilox roller 104, the decorative film 1 according to FIG. 3 or as shown in an illustration in the view according to FIG. 6 is obtained.

To reinforce the 3-D effect, an additional motif print in full-tone printing technology can be applied directly to the underside of the base film and only then the print pattern in the dot matrix, see schematic production process according to FIG. 11. After the embossing roller 101 , a motif print roller 103 closes with counter roller 103 a, with the aid of which a motif 600 is applied in full tone to the underside of the base film 10 . Only thereto, the anilox roller 104 concludes with a counter-pressure roller 104, described 9 as in Fig., On. The motif printing roller 103 , see FIG. 12, has, for example, motifs 600 'for printing, which are congruent to the motif fields 60 of the anilox roller 104 according to FIG. 10. With a method and arrangement according to FIG. 11, decorative films with a 3-D effect according to FIG. 7 can be produced. In addition, it is of course possible to cover the underside of the decorative film 1 according to FIGS. 9 and 11 with a further cover layer made of printing ink, namely a lighter one than the colors of the printing pattern.

In the event that the printing pattern on the underside of the base film 10 with two different grids and corresponding fields should also have different colors of the printing dots, an arrangement as shown schematically in FIG. 13 is proposed. For this purpose, two anilox rollers 104 I and 104 II are provided with corresponding counter-rollers, which, as shown in FIG. 14, each have only a part of the print pattern, namely a raster 20 and 20 ', on the one hand, the background field and, on the other hand, that Motif field 60 forms, so that these two screens and fields can be printed with different colors on the underside of the base film 10 .

The 3-D effect is achieved only with the aid of the anilox rollers with the print patterns with printing dots 20 , 20 'generated by means of the anilox rollers.

Claims (19)

1. Decorative film with 3-D effect, comprising a transparent translucent Base film made of thermoplastic, with the visible side of the Decorative foil serving the top of the foil an embossed structure in the form of a geometric dot-embossing grid with a multitude of convex domes and has a colored print pattern on the underside of the base film Form of a dot print screen is applied and for the embossing screen and the print screen is the same screen shape with different ones Screen rulings are provided and the embossing screen and the printing screen in the top view of the base film viewed with respect to the Axes of their grid shape are arranged parallel to each other. 2. Decorative film according to claim 1, characterized in that the crests are lenticular or pyramid-shaped. 3. Decorative film according to claim 1 or 2, characterized in that the Print patterns from two or more dot print rasters different Grid widths is built. 4. Decorative film according to one of claims 1 to 3, characterized in that in the print pattern applied to the underside of the base film Motif fields are designed in such a way that the motif fields are opposite the remaining area of the print pattern, which form a background field, with a dot print raster with a raster width of the dot Print grid of the print pattern deviating raster width are. 5. Decorative film according to one of claims 1 to 4, characterized in that on the underside of the base film before printing the  Print pattern and / or then a motif print with motifs translucent and / or opaque color is applied. 6. Decorative film according to one of claims 1 to 5, characterized in that the motif fields provided with dot-print grid are congruent with the printed motifs are arranged in transparent color. 7. Decorative film according to one of claims 1 to 6, characterized in that on the underside of the base film a covering the print pattern Cover layer is applied. 8. Decorative film according to claim 7, characterized in that the cover layer contains a colorant so that the top layer is a lighter color than that Color of the print pattern. 9. Decorative film according to one of claims 1 to 8, characterized in that on the underside of the base film following the print pattern or the top layer is a self-adhesive adhesive layer with peelable Protective film is applied. 10. Decorative film according to one of claims 1 to 9, characterized in that a base film with a thickness of 100 to 1000 microns is used and the embossing depth of the embossed structure on the top 5 to 50% of the thickness of the base film and the minimum distance (a) between the Base points of neighboring crests less than 15, preferably less than 10 % of the diameter of the crests. 11. Decorative film according to one of claims 1 to 10, characterized in that the crests of the embossed structure on the top of the base film one Have a diameter at the base of 50 to 500 µm. 12. A method for producing a decorative film with a 3-D effect, in which a transparent translucent base film made of a thermoplastic  Plastic and made by one of an embossing roller and one Counter roll formed nip and pulled on her Top with a geometric embossed structure from a variety of convex crests in grid form and the base film on their underside via at least one anilox roller with a dot Print screen for applying a printing ink and with a Print pattern is provided in the form of a dot print pattern. 13. The method according to claim 12, characterized in that a Anilox roller with a print pattern that consists of partial areas of dot Printing screens with different screen widths is composed, is used. 14. The method according to claim 12, characterized in that two Anilox rollers in succession for printing on one printing ink each the bottom of the base film are used, the anilox rollers the same grid shape in complementary partial areas have, but these differ by different screen rulings differ. 15. The method according to any one of claims 12 to 14, characterized in that the base film between the embossing roller and the first anilox roller for Print the print pattern on at least one motif printing roller for printing a motif from a translucent printing ink is led to the bottom of the base film. 16. The method according to any one of claims 12 to 15, characterized in that that the embossing grid of the embossing roller and the printing grid / Anilox rollers have the same shape with different screen widths have and the print screen parallel to the embossing on the Base film is applied so that the axes of the different grids run parallel to each other.   17. The method according to any one of claims 12 to 16, characterized in that that the base film over after applying the print pattern at least one additional inking roller for applying one light colored top layer is led from a printing ink. 18. The method according to any one of claims 12 to 17, characterized in that the base film after the application of the print pattern or after Applying the top layer is laminated with an adhesive layer. 19. The method according to claim 18, characterized in that a Adhesive layer is used, the outside with a peelable Protective film is covered.