Method of manufacturing a decorative foil and panel comprising such a foil
By adding high molecular weight water-soluble polymers and precipitated silica to the ink receiving layer of decorative foil, the lamination problem between ink and transparent wear-resistant layer in digital printing is solved, enabling efficient manufacturing of decorative foil and high-quality application in floor decoration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- UNILIN BVBA
- Filing Date
- 2020-01-30
- Publication Date
- 2026-05-19
AI Technical Summary
Existing technologies, when using digital printing to manufacture decorative foils, especially when jetting small droplet inks, make it difficult to effectively laminate with transparent abrasion-resistant layers, and water-based inks are prone to causing nozzle clogging, affecting printing quality and efficiency.
An ink receiving layer containing an adhesive and silica is used. The adhesive is preferably a high molecular weight water-soluble polymer. Decorative patterns are formed on a thermoplastic carrier layer by digital printing to enhance the fixation and lamination strength of ink droplets. Precipitated silica is used to improve water retention. The composition of the inkjet receiving layer is optimized by multi-pass printing or low-speed printing.
It achieves efficient lamination of decorative foil and transparent PVC foil, ensuring high peel strength and printing quality, avoiding nozzle clogging, and is suitable for high-speed production, meeting the industrial needs of floor decoration.
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Figure BDA0004490995480000131 
Figure BDA0004490995480000141
Abstract
Description
Technical Field
[0001] This invention relates to a method for manufacturing decorative foil, which can be used as at least part of the decorative layer of a decorative panel. More specifically, the decorative foil obtained by this invention can be applied to flooring, wall panels, ceilings, furniture materials, etc. Background Technology
[0002] The decorative foil of the present invention comprises a thermoplastic, preferably white, carrier layer, such as a polyvinyl chloride-based, preferably rigid PVC (i.e., a plasticizer content of less than 3 phr, or completely plasticizer-free) carrier layer, and a decorative printed pattern provided on said carrier layer. This decorative foil can, for example, be used as a decorative layer for flooring, preferably for flooring types made substantially of synthetic materials. The decorative foil is typically finished with at least one transparent abrasion layer, preferably made of the same thermoplastic material. Such a sheet may include connecting members on at least two opposite edges, said connecting members being of the type that allow two such sheets to be joined together. Flooring designed in this manner is known in particular according to documents US 2002 / 0189183, WO 2011 / 077311, WO 2011 / 141849, and WO 2017 / 087725.
[0003] According to existing technology, decorative foil is printed using offset printing technology, while the lamination of decorative foil and wear-resistant layer can be achieved through pressing and heating, for example, at 165°C and 4 kg / cm². 2 The pressing time is 175 seconds. Recently, techniques for manufacturing decorative foils using digital printing technology are known, for example, according to WO 2015 / 140682. Digital inkjet printing technology is particularly challenging for printing on thermoplastic substrates intended for subsequent lamination when high resolution and correspondingly small ink droplets are required. In cases requiring small droplet ejection, printheads with small nozzle openings are used. With smaller nozzle openings, ink viscosity must be low to avoid nozzle clogging; therefore, water-based inks, for example, contain a large amount of water to create optimal ink rheology for the printhead. It is well known that the resulting foil is difficult to laminate with abrasion-resistant layers. WO 2015 / 140682 proposes solving this problem by applying an adhesive layer to the top layer of the print.
[0004] According to WO 2016 / 146565, it is known to provide a primer layer on PVC foil to accommodate digital printing.
[0005] The present invention first seeks to provide an alternative method for manufacturing decorative foil, and according to several preferred embodiments thereof, provides solutions to one or more problems of the prior art. Summary of the Invention
[0006] Therefore, according to its first independent aspect, the present invention relates to a method for manufacturing decorative foil, wherein the method comprises at least the following steps:
[0007] - The step of providing a thermoplastic carrier layer;
[0008] - The step of providing an ink receiving layer to the carrier layer;
[0009] - The step of forming a decorative pattern on the carrier layer by performing a digital printing operation, wherein droplets of water-based ink with a volume of less than 100 pL are sprayed onto the carrier layer, more specifically onto the ink receiving layer.
[0010] The ink receiving layer is characterized by comprising an adhesive, preferably an adhesive different from that of an acrylic copolymer, and / or silica. The inventors have realized that using an ink receiving layer with an adhesive can serve a dual purpose. The adhesive is preferably hydrophilic so that it can cope with the water content of water-based inks, and the adhesive is also active during subsequent lamination of the resulting decorative foil with, for example, a transparent abrasion-resistant layer.
[0011] Tests show that the available decorative foil, when digitally printed using water-based inks, remains suitable for lamination with transparent PVC foil without the need for an additional adhesive layer. A peel strength greater than 50 N / 5 cm is achieved, which the inventors consider the industrial minimum for flooring applications.
[0012] Preferably, an adhesive is applied to the ink receiving layer, selected from the list of polyurethane-based adhesives (PU), acrylic polyurethane adhesives, polyacrylic adhesives, polyethers, polyvinyl alcohol, vinyl esters, thiols, carbodiimides, polyvinyl butyrate, vinyl chloride-vinyl acetate copolymers (VC-VA), acrylic polymers, and aliphatic polyurethane acrylic adhesives. According to the most preferred embodiment, the adhesive is selected from polyurethane-based adhesives, acrylic polyurethanes, vinyl chloride-vinyl acetate copolymers, and aliphatic polyurethane acrylic adhesives.
[0013] Preferably, the adhesive is a high molecular weight water-soluble polymer, preferably having a molecular weight greater than 40,000, as determined by size exclusion chromatography (SEC) using tetrahydrofuran (THF) as a solvent and calibrated with a polystyrene standard. The molecular weight of the adhesive can be any value from 40,000 to 180,000.
[0014] Adding silica (or aluminum or other absorbent materials as an alternative) to the ink receiving layer improves ink droplet retention, particularly when pigment-containing inks are preferred. Increased water retention is especially important when the digital printing operation described above is a single-pass operation, i.e., a printing operation in which the entire printed pattern is formed in one relative movement of the carrier layer relative to the printing equipment. High water retention in the ink receiving layer is particularly desirable when high production speeds are targeted, such as above 40 or 60 m / min, or even 100 m / min or higher.
[0015] Preferably, the ink receiving layer comprises pigment and binder, wherein the pigment-to-binder ratio is 0.85 or greater. The use of pigment-to-binder ratios of 1 and higher, 1.5 and higher, or 2 and higher is not excluded. This preferred amount of pigment in the ink receiving layer provides sufficient water retention for high-speed single-pass printing, for example, 40 m / min or higher.
[0016] When using a plotter or multi-pass type digital printing equipment, or when implementing the invention using a single-pass engine operating at low speeds (e.g., less than 15 m / min), a smaller amount of silica can be used, for example, a pigment-to-binder ratio of less than 0.3, or silica may be completely or substantially absent from the inkjet receiving coating. A low ink volume, for example, less than 2 g / m², is applied during the printing operation. 2 The same applies to the amount of ink.
[0017] The silica contained in the inkjet receiver coating can be of the precipitated type. The inventors have discovered that precipitated silica increases the long-term stability of the inkjet receiver coating while the lamination strength is unaffected or minimally affected. When mixed with high molecular weight water-soluble polymers, the precipitated silica particles tend to become spatially stable.
[0018] The size of the silica particles, characterized by a d50 particle size as determined by laser scattering particle size determination technique according to ISO 13320-1, is preferably less than 20 micrometers, for example, 1-10 micrometers. Larger silica particles are more likely to cause dust generation in the coating. Preferably, the silica pigment contained in the ink receiving layer has a d50 particle size of less than 5.5 micrometers as determined by laser scattering particle size determination technique according to 13320-1.
[0019] The silica contained in the ink receiving layer can be silica gel and / or fumed silica.
[0020] According to specific implementation methods, the silica contained in the inkjet receiving layer can be modified. For example, the silica can be chemically or physically charged with cationic charges by using polydiallyldimethylammonium chloride (PADMAC), aluminum chloride hydrate (ACH), organosilanes, etc.
[0021] Preferably, the ink receiving layer comprises having a thickness of less than 350 μm as defined and measured according to ISO 9277. 2 / g, or even 250m 2 / g or lower BET value silica pigments.
[0022] Preferably, the ink receiving layer comprises 25 wt%-75 wt%, more preferably 45 wt%-75 wt% silica pigment, taking into account the dry weight of the ink receiving layer. Obviously, in application, the material forming the ink receiving layer can be formed from a dispersion having a solid content of less than 50 wt%. For example, the material can be a dispersion having a solid content of 20 wt%, wherein about half of the solid content is formed from silica pigment. Although the material contains 10 wt% silica, the dry weight of the coating will contain about 50 wt% silica.
[0023] Preferably, a surfactant is included in the inkjet receiving coating. The surfactant increases the leveling ability of the primer and can be added in an amount of 0.01wt% to 0.5wt%.
[0024] Tests show that the carrier layer having the ink receiving layer according to the invention has higher lamination strength when not printed on it. Water-based inks used in digital printing presses are prone to reduced lamination strength. Therefore, it is preferable that both the ink receiving layer and the ink contain a binder. The binders for both the ink receiving layer and the ink can be selected from the list above. According to the most preferred embodiment, the ink receiving layer and the ink contain the same binder. In this case, it is preferable to select a binder that has good adhesion properties when laminated with the abrasion-resistant layer, is compatible with silica and with the ink, and more specifically with the printhead. Preferably, the ink containing the binder remains stable at at least up to 60°C.
[0025] Preferably, the binder contained in the ink is a vinyl chloride-vinyl acetate copolymer, more specifically a trimer of vinyl chloride, vinyl acetate, and ethylene. This binder may be in the form of an aqueous dispersion, for example, under a trade name. CE35 is sourced from Wacker Chemie AG. The trimer of vinyl chloride, vinyl acetate, and ethylene can be any of block, periodic, or graft types. As mentioned above, the binder contained in the ink receiving layer is preferably the same, namely a vinyl chloride-vinyl acetate copolymer, and more specifically a trimer of vinyl chloride, vinyl acetate, and ethylene.
[0026] The inventors have also noted that vinyl chloride-vinyl acetate copolymers, more specifically trimers of vinyl chloride, vinyl acetate, and ethylene, have suitable viscosities for inkjet printheads and sufficient resolubility to allow for the redissolution of any dry ink film that may form at the nozzle opening when the nozzle is rinsed with cleaning fluid or fresh ink. Furthermore, the rheological behavior of the ink remains unaffected even when the binder-containing ink is stored at 60°C for one week. Compared to using polyvinyl alcohol as a binder, the use of vinyl chloride-vinyl acetate copolymers, especially trimers of vinyl chloride, vinyl acetate, and ethylene, such as... Less yellowing was observed at CE35.
[0027] Typically, the digital printing operation of the present invention is preferably performed using a digital printing device with a printhead featuring ink recycling capabilities. Such printheads are commercially available, for example, under trade names such as Xaar1001, XAAR 5601, or Fujifilm Samba.
[0028] Preferably, the ink contains at least 5 wt% of the binder. More preferably, the ink contains 15 wt% to 35 wt% of the binder, of which about 20%, or 17% to 23%, is a favorable value. The availability of the binder also reduces the water content in the water-based ink, which is beneficial for setting the lamination strength and water retention requirements of the ink receiver layer. For example, the amount of silica in the ink receiver layer can be reduced, or the available silica content in the ink receiver layer will be more effective.
[0029] Preferably, the ink receiving layer has a pH value of less than 6. The inventors have discovered that the acidity of the ink receiving layer can play an important role in lamination strength.
[0030] Preferably, the ink receiving layer comprises a polyvalent metal salt or acid. This component can act as an ink pigment crusher or flocculant. Preferably, this component is cationic or acidic, for example, citric acid or boric acid, preferably at a ratio of 5 wt% to 25 wt%. Such pigment crushers, such as cationic or acidic flocculants, rapidly destabilize anionic stable pigments in the ink, thereby minimizing ink bleeding. Furthermore, the inventors have noted that acidic flocculants such as citric acid improve lamination strength compared to salts such as CaCl2.
[0031] It is evident from the above that the inkjet receiving layer preferably contains citric acid and / or boric acid, preferably in an accumulation rate of 5wt%-25wt%.
[0032] Preferably, the step of providing the ink receiving layer to the carrier layer is performed by direct or indirect gravure printing, reverse coating, coincidence coating, pressure chamber coating, curtain coating, spraying, dipping, or non-contact coating, such as by jetting. The applied material for the ink receiving layer is preferably dried, for example, by one or more hot air dryers and / or near-infrared radiators (NIR).
[0033] Preferably, the method of the present invention is further characterized in that the step of providing the ink receiving layer to the carrier layer comprises at least two sub-steps, including: a first sub-step in which pigment and binder are applied to the carrier layer, and a second sub-step in which at least binder is applied to the carrier layer, and the pigment-to-binder ratio of the substance applied in the second sub-step is lower than that of the substance applied in the first sub-step, and / or the substance applied in the second sub-step is completely or substantially free of pigment. This preferred embodiment of the method allows for an overall reduction in the dustiness of the inkjet receiving coating, even if the inkjet receiving coating as a whole (i.e., as seen in the average of the substances applied in all sub-steps) has a high pigment-to-binder ratio, for example, a pigment-to-binder ratio of 0.85 or higher, or even 1 or higher. A higher pigment-to-binder ratio is beneficial for print quality but has a negative impact on lamination strength and dustiness. This preferred embodiment mitigates these negative impacts. Substances with a higher pigment-to-binder ratio cause less interference with lamination and prevent dust content due to the substance applied in the subsequent sub-step (i.e., the second sub-step).
[0034] It is evident from the above that the water-based ink, and preferably the ink receiving layer, comprises a trimer of vinyl chloride, vinyl acetate, and ethylene as a binder. Alternatively, to achieve a similar effect in terms of lamination strength, the ink receiving layer, and preferably the ink itself, may comprise at least a cationic binder, such as a cationic polyurethane. As a further alternative, to achieve a similar effect, the ink receiving layer, and preferably the ink itself, comprises an water-based aliphatic polyurethane dispersion as a binder.
[0035] It is further apparent that decorative foil obtained by any method disclosed in the first aspect can be used in lamination methods, for example, to manufacture decorative panels. Therefore, it is evident that the present invention according to the second independent aspect relates to a method for manufacturing decorative panels or sheets having a substrate, a decorative pattern disposed on a carrier layer, and a transparent abrasion-resistant layer, characterized in that the method at least includes laminating the abrasion-resistant layer onto a decorative foil obtained by the method of the first aspect and / or its preferred embodiments, the decorative foil comprising the decorative pattern and the carrier layer.
[0036] Preferably, the carrier layer is a thermoplastic film, more preferably a PVC film, and even more preferably a "rigid" type of PVC film, i.e., having less than 10% or less than 5% plasticizer, or even no plasticizer at all. Since digital printing is applied to the thermoplastic film, it can be introduced into the flooring in a sustainable manner. Here, a low plasticizer content is advantageous, as better dimensional accuracy can be maintained through possible heat treatment or hot pressing.
[0037] Preferably, the carrier layer is surface activated by, for example, corona or plasma treatment before the material of the ink receiving layer is applied.
[0038] Preferably, the decorative panel is a vinyl-type flooring, more specifically, so-called vinyl ceramic tile, WPC flooring, or SPC flooring.
[0039] The transparent abrasion layer preferably involves a thermoplastic abrasion layer, such as a transparent PVC layer, which is adhered to the bottom layer of the floor, particularly by hot pressing and digital printing. This lamination of the PVC layer on the digital printing can be carried out at a temperature of, for example, about 130-170°C, more preferably about 150-170°C.
[0040] Preferably, the wear-resistant layer does not contain corundum particles or other wear-resistant particles. The top layer of the decorative panel can be finished with a varnish layer, which is provided as a liquid layer on the wear-resistant layer and subsequently cured. Preferably, this involves a varnish layer that can be cured by UV light. Preferably, the varnish layer is provided on top of any possible wear-resistant layer.
[0041] Preferably, the flooring according to the invention relates to a floor in which the flooring or at least the base of the flooring is substantially composed of a thermoplastic material, preferably a soft thermoplastic material. There are several possibilities for constructing such a flooring, and two of these possibilities will be described below.
[0042] According to the first and most preferred possibility, the flooring (or at least the base of the flooring) consists of multiple layers of material, preferably multiple layers of thermoplastic material, more specifically multiple layers of soft thermoplastic material. The different thermoplastic material layers of the substrate may encapsulate one or more layers of fiberglass, such as fiberglass cloth or fiberglass fleece, between them. According to the most preferred embodiment, the substrate consists of two layers of soft PVC, with a fiberglass layer, preferably fiberglass fleece or so-called "non-woven fabric," surrounding them. Preferably, these layers of the substrate also contain filler, such as a certain amount of chalk or limestone. Preferably, the board has a strength of 1250-2250 kg / m². 3 The density.
[0043] According to a second possibility, the base of the floor is made of a thermoplastic material sheet. For example, this could involve a filled synthetic material sheet that may be fully or partially foamed, or unfoamed. Preferably, the sheet is foamed at least in its center within its thickness, while the sheet includes unfoamed surface layers on its top and bottom surfaces.
[0044] According to a preferred embodiment, the flooring (or at least the substrate of the flooring) is substantially composed of polyvinyl chloride, more specifically of flexible polyvinyl chloride, i.e., PVC containing plasticizers. Preferably, it is made of PVC obtained from a suspension homopolymer having a K value of 50-80 or better, 60-67.
[0045] It should be noted that the flooring of the present invention preferably comprises a substrate containing a plasticizer. According to a specific embodiment, this relates to a flooring comprising a substrate containing a plasticizer of the DINP or DINCH type, more specifically having a mass ratio of 20% to 40%, excluding possible filler materials.
[0046] According to one variant, this involves a flooring that is essentially free of plasticizers, for example, having a plasticizer content of less than 5 phr.
[0047] As described above, the flooring of the present invention, in addition to synthetic materials, may also contain filler materials, preferably chalk or chalk-like materials such as limestone or talc. The application of filler materials is particularly suitable for reducing the amount of synthetic material required and / or making the boards heavier. In some cases, heavier boards have the advantage of being more stable during placement and / or after installation and / or holding their position better.
[0048] Preferably, the board material of the present invention relates to a rectangular, square, or rectangular floorboard. Preferably, such a floorboard has connecting members on at least a first pair of opposing edges, the connecting members being of the type that allow two such floorboards to be joined together by downward movement of one floorboard relative to the other, and / or of the type that allow two such floorboards to be joined together by rotational movement along their respective edges. Preferably, the connecting members then provide vertical and horizontal locking. Preferably, the connecting members are integrally manufactured with the floorboard.
[0049] However, the present invention is particularly applicable (but not limited to) thin flooring, and even more particularly applicable to flooring with a thickness of 2-6 mm and more specifically 3-5 mm.
[0050] According to a possible embodiment of the present invention, the floor exhibits the following characteristics:
[0051] - The floor is essentially composed of a core material or substrate, wherein the core material or substrate is made of a material that forms the base material of the floor, and a top layer, in other words, a surface layer, which may or may not consist of multiple layers, including decorative foil obtained according to the first aspect of the invention or a preferred embodiment thereof;
[0052] - The base material of the floor that constitutes the core material is substantially a soft thermoplastic material, wherein the thermoplastic material may contain fillers;
[0053] - And the top layer comprises a printed thermoplastic film obtained by the method of the first aspect of the invention or a preferred embodiment thereof, and a transparent thermoplastic abrasion-resistant layer, wherein the transparent thermoplastic abrasion-resistant layer is thinner than 0.85 mm and contains no filler.
[0054] Obviously, the present invention also relates to a floor covering made of the floor as described above.
[0055] The boards or flooring of the present invention preferably comprise at least one reinforcing layer, preferably formed of fibers, more specifically reinforcing fibers such as glass fibers. Using such a reinforcing layer, particularly a fiber-reinforcing layer, increases the dimensional stability of the flooring. This is especially important for non-glue-installed flooring, as the expansion and / or contraction of the boards under the influence of temperature differences can be significantly reduced by using fibers. Therefore, the risk of connected floorboards separating from each other due to expansion and / or contraction can be further minimized. It should be noted that the aforementioned reinforcing fibers can be present in various forms, such as cloth, flocking, or mesh, more specifically, such as glass fiber cloth or glass fiber flocking. Preferably, viewed in cross-section of the board, the fibers are applied in one or more horizontal layers.
[0056] When applying a single reinforcing layer, such as a single layer with fibers, this layer is preferably located in the middle or approximately in the middle of the board. In this way, the resulting symmetrical structure of the floor provides an advantage in terms of stability. According to a particularly preferred embodiment, two or more reinforcing layers are applied, preferably spaced apart from each other. In the case of two reinforcing layers, these layers are preferably located on either side of the centerline of the floor when viewed in cross-section. Therefore, the advantage obtained is that bending forces are counteracted in both directions. This is particularly advantageous for relatively soft flooring made primarily of soft PVC.
[0057] Clearly, the decorative foil obtained by the method of the first aspect can also be used to manufacture decorative panels, such as wall-to-wall floor coverings. Such floor coverings are referred to in the art as heterogeneous vinyl floor coverings or so-called "vinyl mats." In such floor coverings, a transparent thermoplastic abrasion layer, such as a PVC abrasion layer, is also provided on the printed layer.
[0058] Generally, it should be noted that the transparent abrasion-resistant layer preferably consists essentially of PVC with a plasticizer content of 10% or less. Preferably, this involves a transparent abrasion-resistant layer applied as a film or foil. However, it is not excluded that the PVC of the abrasion-resistant layer can be applied in liquid form or as a paste, and then cured or gelled on a printed layer.
[0059] To further illustrate the invention, some comparative and preferred embodiments are set forth below in two series of embodiments without any limiting features. Detailed Implementation
[0060] Example Series 1
[0061] A 0.07 mm thick rigid PVC foil is surface-activated by corona treatment and provides an inkjet receiving layer containing a vinyl chloride-vinyl acetate binder, more specifically a trimer of vinyl chloride, vinyl acetate, and ethylene, and silica, with the pigment-to-binder ratio PB as shown in the first and second columns of the table below. The applied silica is precipitated silica with a d50 particle size of 5 micrometers. The inkjet receiving coating also contains 15 wt% of a flocculant as described in the third column. In some embodiments, according to the preferred embodiments listed above, the inkjet receiving coating is applied using two sub-steps (“double layer”). In this case, the material applied in the second sub-step does not contain silica pigment.
[0062] Each prepared rigid PVC foil was then digitally printed with water-based ink and laminated onto a 0.5 mm thick transparent PVC abrasion-resistant layer. This lamination was performed at 165°C and 1 kg / cm². 2 Under pressure for 10 seconds, then at 165°C and 4 kg / cm². 2 Perform for 165 seconds under pressure.
[0063] Inspect the prepared foil, printed layers, and products awaiting lamination for dust content, image quality, adhesion or lamination strength, and ink load capacity. Visually analyze the image quality after printing the image using a plotter, specifically a plotter purchased from Epson. These attributes are rated on a scale of 0 to 5, equivalent to poor to perfect. The sum of the scores for all four attributes provides a ranking of several designs, with the highest sum representing the technically ideal result. However, any result with a sum equal to or greater than 15 is acceptable for industrial processes.
[0064]
[0065] The results show that, unless a "double layer" is applied, a higher pigment-to-binder ratio results in higher dust content. Image quality improves with increasing pigment-to-binder ratio, while adhesion generally decreases. The availability of a "double layer" and cationic flocculants such as citric acid improves adhesion or lamination strength.
[0066] The best inkjet receiving coating among the results was a coating with a pigment-to-binder ratio of 1, applied in two sub-steps (“double layer”) according to the preferred embodiments listed above, and containing citric acid. Several other results were also acceptable.
[0067] Depending on the ink load and desired image quality, other coatings in this series may also be acceptable. For example, coatings with a pigment-to-binder ratio of zero or near zero may be acceptable in cases of low ink load, and this is not excluded in the context of this invention, as dust generation and / or adhesion may be considered the most important criteria in certain situations.
[0068] Example Series 2:
[0069] It was carried out in a similar manner to Example Series 1 above, but instead of using a vinyl chloride-vinyl acetate adhesive, a polyurethane adhesive was applied. The results are summarized in the table below in the same way.
[0070]
[0071] The results show that, unless a "double layer" is applied, a higher pigment-to-binder ratio results in higher dust content. Image quality improves with increasing pigment-to-binder ratio, while adhesion generally decreases. The availability of a "double layer" and cationic flocculants such as citric acid improves adhesion or lamination strength.
[0072] The best inkjet receiving coating results were those with a pigment-to-binder ratio of 2, applied in two sub-steps (“double layer”) according to the preferred embodiments listed above, and containing citric acid. Several other results were also acceptable.
[0073] The present invention is by no means limited to the embodiments described above; on the contrary, such decorative film, floor or wall-to-wall floor coverings and methods of manufacturing thereof can be realized in various variations without departing from the scope of the present invention.
Claims
1. A method for manufacturing decorative foil, wherein the method comprises at least the following steps: - The step of providing a thermoplastic carrier layer; - The step of providing an ink receiving layer to the carrier layer; - A step of forming a decorative pattern on the carrier layer by performing a digital printing operation, wherein water-based ink droplets with a volume of less than 100 pL are sprayed onto the carrier layer, more specifically onto the ink receiving layer. The ink receiving layer is characterized in that it comprises an adhesive and / or silica, and the ink receiving layer comprises a cationic flocculant, wherein the cationic flocculant is citric acid.
2. The method according to claim 1, characterized in that, Both the ink receiving layer and the ink contain an adhesive.
3. The method according to claim 1 or 2, characterized in that, The ink receiving layer contains a BET value of less than 350 m. 2 / g of silica pigment.
4. The method according to claim 1 or 2, characterized in that, The ink receiving layer contains 25 wt%-75 wt% silica pigment.
5. The method according to claim 1 or 2, characterized in that, The ink receiving layer comprises pigment and binder, wherein the ratio of pigment to binder is 0.85 or greater.
6. The method according to claim 1 or 2, characterized in that, The ink receiving layer has a pH value of less than 6.
7. The method according to claim 1 or 2, characterized in that, The step of providing the ink receiving layer to the carrier layer includes at least two sub-steps, including: a first sub-step in which pigment and binder are applied to the carrier layer, and a second sub-step in which at least binder is applied to the carrier layer, and the pigment-to-binder ratio of the substance applied in the second sub-step is lower than the pigment-to-binder ratio of the substance applied in the first sub-step.
8. The method according to claim 1 or 2, characterized in that, The ink receiving layer contains at least a cationic binder.
9. The method according to claim 1 or 2, characterized in that, The ink receiving layer contains an aqueous aliphatic polyurethane dispersion as a binder.
10. The method according to claim 1 or 2, characterized in that, The ink receiving layer contains silica pigment having a d50 particle size of less than 5.5 micrometers as determined by laser scattering particle size analysis according to ISO 13320-1.
11. The method according to claim 1 or 2, characterized in that, The ink receiving layer comprises silicone or fumed silica.
12. The method according to claim 1 or 2, characterized in that, The water-based ink contains a trimer of vinyl chloride, vinyl acetate, and ethylene as a binder.
13. The method according to claim 1, characterized in that, The ink receiving layer contains an adhesive that is different from that of an acrylic copolymer.
14. The method according to claim 1, characterized in that, The ink receiving layer and the ink contain the same binder.
15. The method according to claim 1 or 2, characterized in that, Both the ink receiving layer and the ink contain at least a cationic binder.
16. The method according to claim 1 or 2, characterized in that, Both the ink receiving layer and the ink contain an aqueous aliphatic polyurethane dispersion as a binder.
17. The method according to claim 1 or 2, characterized in that, Both the water-based ink and the ink receiving layer contain a trimer of vinyl chloride, vinyl acetate, and ethylene as a binder.
18. A method for manufacturing decorative panels, the decorative panels having a substrate, a decorative pattern disposed on a carrier layer, and a transparent wear-resistant layer, characterized in that, The method includes at least laminating the wear-resistant layer onto the top of a decorative foil obtained by any of the preceding claims, the decorative foil comprising the decorative pattern and the carrier layer.