TRANSFER PAPER AND PRINTING METHOD COMBINING SCREEN PRINTING AND DIGITAL PRINTING

Abstract

The present invention relates to a coated transfer paper for receiving digital printing inks, maintaining high tonal fidelity on the treated surface where the paper transfers the image upon contact with a receptive substrate, thus preventing transfer to surfaces lacking such a substrate. Additionally, the present invention relates to a printing method that combines screen printing and digital printing techniques when using this transfer paper.

Description

TRANSFER PAPER AND PRINTING METHOD COMBINING SCREEN PRINTING AND DIGITAL PRINTING FIELD OF INVENTION The present invention relates to a coated transfer paper for receiving digital printing inks, maintaining high tonal fidelity. This paper is treated to transfer the image upon contact with a receptive substrate, preventing transfer to surfaces lacking such a substrate. Additionally, the present invention relates to a printing method that combines screen printing and digital printing techniques when using this transfer paper. BACKGROUND OF THE INVENTION Throughout history, the textile industry has evolved to develop new finishing and printing techniques on different substrates, seeking better quality properties, process optimization, cost reduction, among others. One of the most used and developed techniques in this sense is screen printing, which has been used for centuries, remaining valid today thanks to countless effects and textures that enrich the technique and make it varied, effects that cannot be replicated with other current technologies, such as digital printing. coynnn / zznz / e / YiAi On the other hand, the increased use of synthetic fibers such as nylon and polyester, and the need for custom-designed applications, has generated renewed interest in printing these materials. In response to this demand, indirect techniques such as sublimation emerged, allowing the printing of custom designs onto garments. This involves applying a design to a substrate, usually paper, using a printer, which is then transferred to a garment by applying heat. For its part, the digital printing industry has developed technologies for textile applications, providing printers for working on different textile substrates, with both direct and indirect printing. Many efforts have been made to improve transfer processes in indirect methods, developing transfer films, focusing many of these developments on improving resistance to washing and rubbing, improving elongation, film softness and proper coverage on dark backgrounds, where specifically for the case of dark backgrounds on synthetic materials the efforts have been directed towards developing the control of ink migration. Thus, in the state of the art there is a plurality of disclosures related to this type of technique and transfer papers, among which is document CN101148828A, which discloses fabric treatment technology, and consists especially of a silk thermal transfer process with high color intensity and high color fastness that comprises a silk thermal transfer printing method coynnn / zznz / B / YiAi, in which the process comprises the following steps: 1) Image production: the image is entered into the computer, and the image is printed on the transfer paper with ink from an inkjet printer; 2) Silk pretreatment: the silk pretreatment process is carried out with a padding coiling machine, with a pretreatment agent, the processing conditions are immersion; then the silk is dried with a dryer at room temperature up to 150°C;3) Image transfer: The image-printed transfer paper is applied to the surface of the silk to be transferred; the transfer paper and silk are placed in the transfer machine and pressure is applied. After pressing for 20-35 seconds, the transfer paper peels off the silk. Another disclosure related to the presented transfer paper is found in document WO / 2012 / 152281, which refers to a transfer paper for transferring an ink print onto a fabric, said transfer paper comprising: i) a base paper; i) an additive comprising a starch component and a binding agent; wherein the starch component is a starch selected from the group comprising: unmodified starch or a modified starch or a mixture thereof; and wherein said binding agent is a binding agent selected from the group comprising: an alkylketene dimer, a high oil / fumaric acid copolymer, a styrene / acrylate copolymer and an alkenylsuccinic anhydride and a mixture thereof; wherein said base paper comprises a quantity of said additive when impregnated therewith;and where said base paper has a water absorption as defined by a Cobb-45 value of 10-100 g / m2 since it has a Gurley Porosity of 10140 seconds.; On the other hand, there is document US6038977, which relates to A method for printing the first and second images on a stretchable flexible substrate using successive screen printing and digital printing processes, the method comprising: printing a first image on the stretchable flexible substrate using a silk screen and producing a first image on a stretched flexible substrate, the first image caused by the silk screen and the stretchable flexible substrate being stretched during printing; mounting a stencil material on a drum of a digital printer; printing a second image on the stencil material with the digital printer, the first and second images being related to form a composite image; placing the stretched flexible substrate on the printer drum with respect to the stencil material;Align the stretched flexible substrate in a desired position so that the first image on the stretched flexible substrate is aligned with the second image on the stencil material; mount the stretched flexible substrate on the drum of the digital printer in the desired position; and print the second image on the stretched flexible substrate using the digital printer, so that the first image and the second image are aligned. Also included is document US6267052B1, which relates to a method for forming images on a substrate. The method consists of applying a first layer to the substrate to form a print pattern and a second step to present a directed design on the substrate, both within an external area of ​​the print. Within the print pattern, the directed design is formed on a durable imaging material that forms at least part of the design layer. Outside the print pattern, the directed design does not form a durable imaging material; therefore, a durable image is formed only on the first layer applied to the substrate. Finally, there is document EP2418090, which relates to a transfer paper that has a porous filter layer formed by etching onto a paper base. The weight of the porous filter layer is 30–60 g / m² and its air permeability is 110–500 ml / min. The porous filter layer contains ethanol-soluble carboxymethyl cellulose or hydroxypropyl cellulose. Based on the information disclosed in the state-of-the-art documents, it is clear that there is a main problem: obtaining finishes on fabrics or other substrates that guarantee properties of adhesion, resistance to rubbing, high definition, finishes with multiple tactile and visual effects, with greater resistance and solidity, easy handling, economical, ecological and that at the same time prevent the migration of colors. Based on the above, it is clear that there is a need in the current state of the art to offer a method that allows the combined application of screen printing and digital printing, providing as a connecting element between both technologies a transfer paper, specially developed for this purpose, with a series of improved properties such as adhesion, high definition, and migration control, without restricting its application to other compatible substrates. This allows for achieving finishes and effects that previously required significant investments of time and effort. coynnn / zznz / B / YiAi SUMMARY OF THE INVENTION The present invention is directed to the field of textile printing, particularly to screen printing and digital printing techniques, merging both techniques into a new process that includes a coated transfer paper, which allows the combination of both methods. Combining both methods achieves the versatility of screen printing with the wide color gamut and high resolution of digital printing. It solves several problems associated with digital printing on textiles, such as: adhesion to different types of textile substrates, colorfastness, elongation, coverage on dark backgrounds, control of dye migration on dark backgrounds in synthetic fabrics, and application of special effects. The paper can be peeled off after being applied cold or hot. This method eliminates the need for cutting and weeding processes required for vinyl decals applied to textiles, as the image printed on the transfer paper adheres only to the outline of the pre-printed substrate. This allows for transfers of individual pieces using heat presses and for transfers of fabric rolls using calenders. This method comprises the steps of printing a silhouette or drawing onto a substrate, applying between one and three layers of Receptor Base Ink (TBR) using the screen printing technique. This base should be dry to the touch. The transfer paper is then printed with Special Digital Ink (TED) using the selected design, applying the digital printing method, and allowed to dry. Next, the printed image on the transfer paper is placed directly onto the area printed with Receptor Base Ink on the substrate, ensuring alignment. The paper is then pressed at a specific temperature and pressure, and finally, the paper is removed. The transfer paper consists of a cellulose sheet of bond, kraft or glassine type, a coating layer containing water-soluble polymers, suspended solids, resin or polymer compatible with transfer base material (TBR), binding polymer, mold release agents, emulsifiers, pH stabilizer and preservatives. In a preferred method, the combined screen printing and printing process is performed on a white cotton fabric. Initially, a white TBR (Receiving Base Ink) is applied using a screen printing stencil with a specific design silhouette. Two layers of TBR ink are applied with intermediate drying time. Subsequently, a coated transfer paper is used, and the selected design is printed on it using a piezoelectric printhead printer (desktop or large format) loaded with TED (Digital Specialty Ink). The printed paper is allowed to dry, then placed onto the printed TBR, aligning it for pressing. Finally, the transfer paper is removed. coynnn / zznz / B / YiAi coynnn / zznz / B / Y DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer paper that acts as a medium for receiving digital printing while maintaining high tonal fidelity. This paper is treated to transfer the digital image upon contact with the Receiving Base Ink. In areas of the substrate where there is no Receiving Base Ink, there is no image transfer from the paper to the substrate. This is a significant advantage, as it prevents contamination of the substrate in unwanted areas and speeds up transfer productivity. Additionally, the invention relates to a novel printing method that utilizes this paper. Special Transfer Paper has a specific coating tailored to each type of substrate. The paper's function is to receive the digital print and deposit it onto the substrate's ink, encapsulating the pigment during transfer. This process results in the high durability of this technique, which is not achievable with direct pigment-based digital printing methods. Thanks to the elements that make up this paper, a high affinity and transfer applicability to a wide range of thermoplastic polymers is also evident, such as: • PET (Polyethylene terephthalate) • HDPE (High-density polyethylene) • PVC (Polyvinyl chloride) • LDPE (Low-density polyethylene) • PP (Polypropylene) • PS (Polystyrene) The application to these materials will depend on the techniques used to fuse them with thermal means, in order to achieve the high-quality prints mentioned above. The following describes each of the elements that make up the aforementioned transfer paper. The paper base The base is a sheet of cellulose paper, either bond or kraft, with a weight ranging from 40 to 150 grams per square meter. For special cases where greater transparency is required for better registration of the paper on the screen printing base (TBR), and if the low-grammage kraft paper does not provide the necessary transparency, a glassine paper between 50 and 90 grams per square meter can be used. The coating of the transfer paper can generally reach a range of 5 to 40 percent by weight, over the total weight of the base paper. The coating consists of the following elements: • Water-soluble polymers: 0-30% • Suspended solids: 0-10% • Resin or polymer base compactable with transfer base material: 8-30% • Binding polymer: 2-10% • Release agents: 0-8% • Emulsifiers: 0-4% • pH stabilizer: 0-2% • Preservatives: 0-1% • Water to make up to 100% Water-soluble polymers They can be non-ionic or ionic, such as polyvinyl alcohol or cellulose ethers. In the case of polyvinyl alcohol, they can be used in fully or partially hydrolyzed forms, the latter being the most common. Their molecular weight can be varied to generate different viscosities. Cellulose polymers can be non-ionic cellulose ethers, based on wood pulp or cotton fiber. There are two main types of cellulose ethers: EHEC (ethylhydroxyethylcellulose) and MEHEC (methylethylhydroxyethylcellulose). Ionic cellulose ethers, such as carboxymethylcellulose (CMC), are also available as whitish powders of varying particle sizes. Other soluble polymers include starch and polyvinylpyrrolidone. They act as thickening agents, suspension stabilizers, water-retaining agents, dispersing agents, binding agents, and protective colloids. Suspended solids It has several roles within the formulation, one of which is to increase the solids in the coating, but its main function is to generate a high porosity that allows the proper drying of the ink when high-quality designs are required in digital printing that exceeds an ink dosage of 4 ml per square meter. For this, fine granulometry minerals can be used, with sizes between 0.7 micrometers (µm) and 10 µm, among which carbonates, calcined kaolins, pyrogenic silica and pyrogenic alumina can be used, the latter being the most outstanding since they impart transparency to the application and therefore not only control the definition but also the sharpness of the tones. Resin or polymer base compatible with transfer base material They have the property of fusing with the receiving base ink (TBR) or with other compatible materials. This polymer becomes tack-free at transfer temperatures to prevent adhesion to the substrate in unwanted areas. For this purpose, polymers with a glass transition temperature above 35°C are used, and these can be hard acrylic polymers, polymers with Core Shell technology, or vinyl polymers such as polyvinyl chloride (PVC). Generally, thermoplastic polymers are used. Other polymers that could be used include polyamides or polyurethanes with particle sizes suitable for the application. Binding polymer The binder is usually an acrylate or methacrylate ester latex, or both. The ester portion of these monomers can be C1-C6 alkyl groups, such as methyl, ethyl, and butyl groups. Methyl esters typically impart hard properties, while other esters typically impart soft properties. The terms hard and soft are used qualitatively to refer to hardness at room temperature and flexibility at low temperature, respectively. Vinyl ethylene resins can also be used because they are suitable due to their softness and compatibility with the other elements of the composition described herein. The solids content of these resins usually ranges from 40% to 60%. Mold release agents To improve demolding conditions and enable it to be done both hot and cold, substances that contribute to this function are required. In the composition, petroleum jelly, mineral oils, or polyethylene oxides with a degree of polymerization between 200 and 400 were used. Since these products are insoluble in aqueous systems, they must be made liquid (in the case of petroleum jelly) and then emulsified to make them stable and allow their incorporation into the system to generate a creamy and slightly fluid water-based composition. Emulsifiers An anionic surfactant may be used, if desired. Examples of anionic surfactants include, but are not limited to, straight-chain and branched-chain sodium alkylbenzenesulfonates, straight-chain and branched-chain alkyl sulfates, and straight-chain and branched-chain alkyl ethoxy sulfates. Examples of nonionic surfactants include, again by way of illustration only, alkyl polyethoxylates, polyethoxylated alcohols, and fatty acid ethanol amides. Sorbitan esters (SPANs) also perform well as W / O emulsifiers. In combination with ethoxylated sorbitan esters (the Tween range), they contribute to the overall stability of O / W emulsions. Manipulating the Span / Tween ratio produces emulsifying systems with various HLB values, allowing the emulsification of the release agents of the present invention. coynnn / zznz / e / YiAi pH stabilizer 95% 2-amino-2-methyl-l-propanol is a highly efficient amino alcohol for neutralizing and regulating the pH of formulations. It provides greater gloss and does not affect the coating's resistance to washing. Other amines can also be used, such as triethanolamine, which is primarily used as an emulsifier and surfactant. It adjusts and buffers pH and improves the stability of emulsions. Preservatives Preservatives derived from chloromethylisothiazolinone are used with a broad spectrum of activity: they control bacteria (gram-negative and gram-positive) and fungi, such as yeasts and molds, without formaldehyde, authorized by the FDA in adhesives and paper coatings, low toxicity, it is microbicidal, it is non-toxic at the recommended use levels in its final formulation, compatible with surfactants and emulsifiers regardless of their ionic nature. Said transfer paper comprises a base formed by a sheet of bond, kraft or glassine cellulose; a coating layer containing: Water-soluble polymers, 0-30% by weight, such as polyvinyl alcohol or cellulose ethers; Solids in suspension for ink drying, 0-10% by weight, such as fine-grained minerals, with sizes between 0.7 and 10 micrometers; Resin or base polymer compatible with the transfer base material, 8-30% by weight, such as thermoplastic polymers; Binding polymer, 2-10% by weight, such as acrylate ester latex, methacrylate, or both; Release agents, 0-8% by weight, such as petrolatum, mineral oils or polyethylene oxides; Emulsifiers, 0-4% by weight, such as anionic surfactants; pH stabilizer 0-2% by weight; Preservatives 0-1% by weight. wherein the water-soluble polymers of the coating are selected from the group of totally or partially hydrolyzed polyvinyl alcohol or cellulose ethers such as EHEC (ethylhydroxyethylcellulose) and MEHEC (methyl ethylhydroxyethylcellulose), carboxymethyl cellulose, starch or polyvinylpyrrolidone; wherein the suspended solids of the coating are selected from the group of carbonates, calcined kaolins, pyrogenic silica and pyrogenic alumina; wherein the resin or compatible base polymer of the coating is selected from the group of thermoplastic polymers such as hard acrylic polymers or core shell technology polymers or vinyl polymers such as polyvinyl chloride, polyamides or polyurethanes; wherein the binding polymer of the coating is selected from the latex group of acrylate, methacrylate, or both ester latexes. The ester portion of these monomers can be C1-C6 alkyl groups, such as methyl, ethyl, and butyl groups, vinyl ethylene resins;wherein the petrolatum, mineral oils or polyethylene oxides of the release agent are in an emulsified liquid state, with a degree of polymerization between 200 and 400; wherein the emulsifiers of the coating are selected from the group of linear and branched-chain sodium alkylbenzenesulfonates, linear and branched-chain alkyl sulfates, and linear and branched-chain alkyl ethoxy sulfates, alkyl polyethoxylates, polyethoxylated alcohols, fatty acid ethanol amides, sorbitan esters (SPAN), emulsifiers (water / oil) in combination with ethoxylated sorbitan esters (the Tween range), contribute to the overall stability of oil / water emulsions; wherein the stabilizer of the coating is 95% 2-amino-2-methyl-l-propanol; wherein the preservatives of the coating are selected from the group of chloromethylisothiazolinone derivatives;Where the dry coating layer of the paper is in a range between 5 and 40% by weight, on the total weight of the transfer paper, and the bond or kraft cellulose sheets have basis weights ranging from 40 to 150 g / m2, and the glassine sheets have basis weights ranging from 50 to 90 g / m2.; In a preferred embodiment, the transfer paper comprises: an 80 g / m² bond paper sheet with a wet coating applied in the range of 40 to 50 grams per square meter, wherein said coating comprises: 15% PVC K-74 resin; 3% ethoxylated lauryl alcohol; 2% polyethylene glycol between 200-400 moles; 1% fumed silica; 5% aqueous solution of 10% medium viscosity polyvinyl alcohol; 0.2% 2-methyl-4-thiazoline-3-ketone; 0.5% 95% 2-amino-2-methyl-1-propanol; 5% acrylic resin emulsion; and water to make up 100%. Where these components are mixed homogeneously until a paste is obtained, which is applied to the paper in the indicated proportion. In one embodiment, the transfer paper comprises: a 60 g / m2 kraft paper sheet applying a wet coating in the range of 40 to 50 grams per square meter, wherein said coating comprises: 15% solid acrylic resin; 3% ethoxylated lauryl alcohol; 2% polyethylene glycol between 200-400 moles; 1% pyrogenic silica; 5% aqueous solution of 10% medium viscosity polyvinyl alcohol; 0.2% 2-methyl-4-thiazoline-3-ketone 5-chloromethyl-4-thiazoline-3-ketone; 0.5% 2-amino-2-methyl-1-propanol 95%; 5% acrylic resin emulsion; water to make up 100%. Where these components are mixed homogeneously until a paste is obtained, which is applied to the paper in the indicated proportion. coynnn / zznz / B / Y The combined screen printing and digital printing method comprises the following stages: a. Print a silhouette or drawing on a substrate, applying the screen printing technique, adding between one and three layers of Receptor Base Ink (TBR). b. Pre-dry the print from step a. at a temperature between 80 and 120 °C, for a period of time between 5 and 20 seconds. c. Print a selected design on transfer paper using Special Digital Ink (TED) and applying the digital printing method with a digital printer with a piezoelectric printhead. d. After printing, dry the transfer paper at a temperature between 23 and 55 °C, for between 10 and 60 seconds. e. Place the image printed on transfer paper in direct contact with the area printed with Receiving Base Ink on the substrate, in a coincidental manner. f. Press between 30 and 90 pounds / square inch, at a temperature between 150 and 210 °C for a period between 15 and 60 seconds. g. Remove the transfer paper from the substrate In one modality the substrate is textile and can be cotton, polyester, nylon mixtures of these or other textile fibers, in light or dark colors. In one method, the pressing step is performed in a heat press or a calender, and the paper in the final step is removed either cold or hot. Alternatively, the digital transfer printing method is performed on a thermoplastic substrate, characterized in that it comprises the following stages: a. Print a selected design on transfer paper using Special Digital Ink (TED) and applying the digital printing method with a digital printer with a piezoelectric printhead. b. Dry the transfer paper at a temperature between 23 and 55 °C, for between 10 and 60 seconds. c. Place the image printed on transfer paper in direct contact with a thermoplastic substrate, such as PET (Polyethylene terephthalate), HDPE (High-density polyethylene), PVC (Polyvinyl chloride), LDPE (Low-density polyethylene), PP (Polypropylene) and PS (Polystyrene), in the area where you want to place the image. d. Press between 30 and 90 lb / in², at a temperature between 150 and 210 °C for a period between 15 and 60 seconds. Use a heat press that is adapted to the shape and required use of each substrate. e. Remove the transfer paper from the substrate. In another modality, the Receiving Base Ink (TBR) can have different effects and finishes such as: white for the reception of flat colors, thermochromatic, photochromatic, phosphorescent, metallic, or textured effects or present fragrances that expand and enrich the variety of finishes. In another desired alternative, the printing paper used in step c. of the method consists of a base made of a cellulose sheet of bond, kraft or glassine type; a coating layer containing, Water-soluble polymers, 0-30% such as polyvinyl alcohol or cellulose ethers; Solids in suspension for ink drying, 0-10% by weight, such as fine-grained minerals, with sizes between 0.7-10 micrometers; Resin or base polymer compatible with transfer base material, 8-30%, such as thermoplastic polymers; Binding polymer, 2-10%, such as acrylate ester latex, methacrylate, or both; Release agents, 0-8%, such as petrolatum, mineral oils or polyethylene oxides; Emulsifiers, 0-4%, such as anionic surfactants; pH stabilizer 0-2%; Preservatives 0-1%;wherein the water-soluble polymers of the coating are selected from the group of totally or partially hydrolyzed polyvinyl alcohol or cellulose ethers such as EHEC (ethylhydroxyethylcellulose) and MEHEC (methyl ethylhydroxyethylcellulose), carboxymethyl cellulose, starch or polyvinylpyrrolidone; wherein the suspended solids of the coating are selected from the group of carbonates, calcined kaolins, pyrogenic silica and pyrogenic alumina; wherein the resin or compatible base polymer of the coating is selected from the group of thermoplastic polymers such as hard acrylic polymers or core shell technology polymers or vinyl polymers such as polyvinyl chloride, polyamides or polyurethanes; wherein the binding polymer of the coating is selected from the latex group of acrylate, methacrylate esters, or both. The ester portion of these monomers can be C1-C6 alkyl groups, such as methyl, ethyl, and butyl groups, vinyl ethylene resins;wherein the petrolatum, mineral oils or polyethylene oxides of the release agent are in an emulsified liquid state, with a degree of polymerization between 200 and 400; wherein the emulsifiers of the coating are selected from the group of linear and branched-chain sodium alkylbenzenesulfonates, linear and branched-chain alkyl sulfates, and linear and branched-chain alkyl ethoxy sulfates, alkyl polyethoxylates, polyethoxylated alcohols, fatty acid ethanol amides, sorbitan esters (SPAN), emulsifiers (water / oil) in combination with ethoxylated sorbitan esters (the Tween range), contribute to the overall stability of oil / water emulsions; wherein the stabilizer of the coating is 95% 2-amino-2-methyl-l-propanol; wherein the preservatives of the coating are selected from the group of chloromethylisothiazolinone derivatives;Where the dry coating layer of the paper is in a range between 5 and 40% by weight, on the total weight of the transfer paper, and the bond or kraft cellulose sheets have basis weights ranging from 40 to 150 g / m2, and the glassine sheets have basis weights ranging from 50 to 90 g / m2.; In a preferred method, the combined screen printing and printing process is performed on a white cotton fabric. Initially, a white TBR (Target Receptor Base) ink is applied using a 55 threads / cm screen printing mesh with a specific design silhouette. Two layers of TBR ink are applied with intermediate drying. Next, a coated 80 g / m² kraft transfer paper is used, and the selected design is printed on it using a piezoelectric printhead printer loaded with TED (Digital Special Ink) at a resolution greater than 250,000 dots / square inch. The design is allowed to dry at 25°C for 2 minutes, and then the TBR is placed on top of the printed TBR. The printed area must be aligned and in direct contact with the TBR. The entire assembly is then placed under a heat press at a pressure of 60 psi and a temperature of 185°C for 25 seconds.After this time, remove the print from the heat press and let it cool for 1 minute. Then, peel off the backing paper, achieving complete image transfer to the TBR base on the textile substrate with a high degree of definition in the outlines and easy paper removal. The application has high definition and excellent resistance to rubbing and wet washing. It was subjected to washing tests in a conventional washing machine, withstanding 20 cycles with a rating of 4.5-5 on the gray scale. The main advantages of the new transfer paper and the method that uses it are: • High definition and resolution of the images. • Multiple special effects. • Coverage on dark backgrounds. • Adhesion to different substrates. • High elongation capacity. • High resistance and wash fastness. • Dye migration control. • The ease of use of the technique allows for high productivity. • System suitable for large and small print runs. • Speed ​​in garment customization. • Possibility of using small or large format printers.

Claims

1. Transfer paper characterized in that it comprises a base formed by a cellulose sheet of bond, kraft or glassine type; a coating layer containing: Water-soluble polymers, 0-30% by weight, such as polyvinyl alcohol or cellulose ethers; Solids in suspension for ink drying, 0-10% by weight, such as fine-grained minerals, with sizes comprising 0.7 - 10 micrometers; Resin or base polymer compatible with the transfer base material, 8-30% by weight, such as thermoplastic polymers; Binding polymer, 2-10% by weight, such as acrylate ester latex, methacrylate, or both; Release agents, 0-8% by weight, such as petrolatum, mineral oils or polyethylene oxides; Emulsifiers, 0-4% by weight, such as anionic surfactants; pH stabilizer 0-2% by weight; Preservatives 0-1% by weight.

2. The transfer paper of claim 1 characterized in that the water-soluble polymers of the coating are selected from the group, totally or partially hydrolyzed polyvinyl alcohol or cellulose ethers such as, EHEC (ethylhydroxyethylcellulose) and MEHEC (methyl ethylhydroxyethylcellulose), carboxymethyl cellulose, starch or polyvinylpyrrolidone.

3. The transfer paper of claim 1 characterized in that the solids in the coating suspension are selected from the group of carbonates, calcined kaolins, pyrogenic silica, and pyrogenic alumina.

4. The transfer paper of claim 1 characterized in that the resin or compatible base polymer of the coating is selected from the group of thermoplastic polymers, such as hard acrylic polymers or core shell technology polymers or vinyl polymers such as polyvinyl chloride, polyamides or polyurethanes.

5. The transfer paper of claim 1 characterized in that the binding polymer of the coating is selected from the latex group of acrylate, methacrylate esters, or both. The ester portion of these monomers may be C1-C6 alkyl groups, such as methyl, ethyl, and butyl groups, vinyl ethylene resins.

6. The transfer paper of claim 1 characterized in that the petrolatum, mineral oils or polyethylene oxides of the release agent are in an emulsified liquid state, with a degree of polymerization between 200 and 400.

7. The transfer paper of claim 1 characterized in that the coating emulsifiers are selected from the group of linear and branched-chain sodium alkylbenzenesulfonates, linear and branched-chain alkyl sulfates, and linear and branched-chain alkyl ethoxy sulfates, alkyl polyethoxylates, polyethoxylated alcohols, fatty acid ethanol amides, sorbitan esters (SPAN), emulsifiers (water / oil) in combination with ethoxylated sorbitan esters (the Tween range), contribute to the overall stability of oil / water emulsions.

8. The transfer paper of claim 1, characterized in that the pH stabilizer of the coating is 95% by weight 2-amino-2-methyl-l-propanol.

9. The transfer paper of claim 1 characterized in that the preservatives of the coating are selected from the group of chloromethylisothiazolinone derivatives.

10. The transfer paper of claims 1 to 9, characterized in that the bond or kraft cellulose sheets have basis weights ranging from 40 to 150 g / m2, and the glassine sheets have basis weights ranging from 50 to 90 g / m2.

11. The transfer paper of claims 1 to 10, characterized in that the paper coating layer is in a range of 5 to 40% by weight, on a dry weight basis of the paper.

12. The transfer paper of claims 1 to 11, characterized in that it comprises: a sheet of 80 g / m2 bond paper with a wet coating applied in the range of 40 to 50 grams per square meter, wherein said coating comprises: 15% by weight of PVC K-74 resin; 3% by weight of ethoxylated lauryl alcohol; 2% by weight of polyethylene glycol between 200-400 moles; 1% by weight of pyrogenic silica; 5% by weight of a 10% aqueous solution of medium-viscosity polyvinyl alcohol; 0.2% by weight of 2-methyl-4-thiazolinone-3-ketone; 0.5% by weight of 95% 2-amino-2-methylpropanol; 5% by weight of acrylic resin in emulsion; Water to complete 100%. Where these components are mixed homogeneously until a paste is obtained, which is applied to the paper in the indicated proportion.

13. The transfer paper of claims 1 to 11, characterized in that it comprises: a 60 g / m² kraft paper sheet with a wet coating applied in the range of 40 to 50 grams per square meter, wherein said coating comprises: 15% by weight of solid acrylic resin; 3% by weight of ethoxylated lauryl alcohol; 2% by weight of polyethylene glycol between 200-400 moles; 1% by weight of fumed silica; 5% by weight of a 10% aqueous solution of medium-viscosity polyvinyl alcohol; 0.2% by weight of 2-methyl-4-thiazoline-3-ketone; 0.5% by weight of 95% 2-amino-2-methyl-1-propanol; 5% by weight of acrylic resin in emulsion; Water to complete 100%. Where these components are mixed homogeneously until a paste is obtained, which is applied to the paper in the indicated proportion.

14. A combined screen printing and digital printing method characterized in that it comprises the following steps: a. Printing a silhouette or drawing onto a substrate, applying the screen printing technique, applying between one and three layers of Receptor Base Ink (TBR). b. Pre-drying the print from step a. at a temperature between 80 and 120 °C, for a period between 5 and 20 seconds. c. Printing a selected design onto transfer paper with Special Digital Ink (TED), applying the digital printing method, using a digital printer with a piezoelectric printhead. d. After printing, drying the transfer paper at a temperature between 23 and 55 °C, for between 10 and 60 seconds. e. Placing the printed image on the transfer paper in direct contact with the area printed with Receptor Base Ink on the substrate, in a coincidental manner. f.Press between 30 and 90 pounds per square inch, at a temperature between 150 and 210 °C for a period between 15 and 60 seconds. g. Remove the transfer paper from the substrate.

15. The combined screen printing and digital printing method of claim 14, characterized in that the substrate is textile.

16. The combined screen printing and digital printing method of claim 15, characterized in that the textile substrate is cotton, polyester, nylon, mixtures of these or other textile fibers, in light or dark colors.

17. The combined screen printing and digital printing method of claim 12, characterized in that the pressing of step f. is performed in a heat press or a calender.

18. The combined screen printing and digital printing method of claim 14, characterized in that step g. of removing the transfer paper is performed cold or hot.

19. The combined screen printing and digital printing method of claim 14, characterized in that the Receiving Base Ink (TBR) can have different effects and finishes such as: white for receiving flat colors, thermochromic, photochromic, phosphorescent, metallic, or textured effects or have fragrances that expand and enrich the variety of finishes.

20. The combined screen printing and digital printing method of claim 14, characterized in that the transfer paper comprises a base formed from a cellulose sheet of bond, kraft or glassine type; a coating layer containing: 0-30% water-soluble polymers such as polyvinyl alcohol or cellulose ethers; 0-10% by weight solids in suspension for ink drying, such as fine-grained minerals with sizes comprising 0.7-10 micrometers; 8-30% resin or base polymer compatible with the transfer base material, such as thermoplastic polymers; 2-10% binding polymer, such as acrylate ester latex, methacrylate, or both; 0-8% release agents, such as petrolatum, mineral oils or polyethylene oxides; 0-4% emulsifiers, such as anionic surfactants; pH stabilizer 0-2%; Preservatives 0-1%;wherein the water-soluble polymers of the coating are selected from the group of totally or partially hydrolyzed polyvinyl alcohol or cellulose ethers such as EHEC (ethylhydroxyethylcellulose) and MEHEC (methyl ethylhydroxyethylcellulose), carboxymethyl cellulose, starch or polyvinylpyrrolidone; wherein the suspended solids of the coating are selected from the group of carbonates, calcined kaolins, pyrogenic silica and pyrogenic alumina; wherein the resin or compatible base polymer of the coating is selected from the group of thermoplastic polymers such as hard acrylic polymers or core shell technology polymers or vinyl polymers such as polyvinyl chloride, polyamides or polyurethanes;wherein the binding polymer of the coating is selected from the latex group of acrylate, methacrylate esters, or both. The ester portion of these monomers can be C1-C6 alkyl groups, such as methyl, ethyl and butyl groups, vinyl ethylene resins; wherein the petrolatum, mineral oils or polyethylene oxides of the release agent are in an emulsified liquid state, with a degree of polymerization between 200 and 400; where the coating emulsifiers are selected from the group of linear and branched-chain sodium alkylbenzenesulfonates, linear and branched-chain alkyl sulfates, and linear and branched-chain alkyl ethoxy sulfates, alkyl polyethoxylates, polyethoxylated alcohols, fatty acid ethanol amides, sorbitan esters (SPAN), emulsifiers (water / oil) in combination with ethoxylated sorbitan esters (the Tween range), contribute to the overall stability of oil / water emulsions;wherein the stabilizer of the coating is 95% 2-amino-2-methyl-l-propanol; wherein the preservatives of the coating are selected from the group of chloromethylisothiazolinone derivatives; wherein the dry coating layer of the paper is in a range between 5 and 40% by weight of the total weight of the transfer paper, and the bond or kraft cellulose sheets have basis weights ranging from 45 to 150 g / m2, and the glassine sheets have basis weights ranging from 50 to 90 g / m2.

21. Digital printing method by transfer on a thermoplastic substrate, characterized in that it comprises the following steps: a. Printing a selected design onto transfer paper with Special Digital Ink (TED) using a digital printing method with a digital printer equipped with a piezoelectric printhead. b. Drying the transfer paper at a temperature between 23 and 55 °C for 10 to 60 seconds. c. Placing the image printed on the transfer paper in direct contact with a thermoplastic substrate, such as PET (Polyethylene terephthalate), HDPE (High-density polyethylene), PVC (Polyvinyl chloride), LDPE (Low-density polyethylene), PP (Polypropylene), and PS (Polystyrene), in the area where the image is to be placed. d. Applying a heat press at a pressure of 30 to 90 lb / in² at a temperature between 150 and 210 °C for a period of 15 to 60 seconds. e. Remove the transfer paper from the substrate.

22. The transfer method of claim 21, characterized in that step e. of removing the transfer paper is performed cold or hot.

23. The transfer method of claim 21, characterized in that the transfer paper comprises a base formed by a cellulose sheet of bond, kraft or glassine type; a coating layer containing: water-soluble polymers, 0-30% such as polyvinyl alcohol or cellulose ethers; solids in suspension for ink drying, 0-10% by weight, such as fine-grained minerals, with sizes comprising 0.7-10 micrometers; resin or base polymer compatible with the transfer base material, 8-30%, such as thermoplastic polymers; a binding polymer, 2-10%, such as acrylate ester latex, methacrylate, or both; and mold release agents, 0-8%, such as petrolatum, mineral oils or polyethylene oxides; Emulsifiers 0-4%, such as anionic surfactants; pH stabilizer 0-2%; Preservatives 0-1%;wherein the water-soluble polymers of the coating are selected from the group of totally or partially hydrolyzed polyvinyl alcohol or cellulose ethers such as EHEC (ethylhydroxyethylcellulose) and MEHEC (methyl ethylhydroxyethylcellulose), carboxymethyl cellulose, starch or polyvinylpyrrolidone; wherein the suspended solids of the coating are selected from the group of carbonates, calcined kaolins, pyrogenic silica and pyrogenic alumina; wherein the resin or compatible base polymer of the coating is selected from the group of thermoplastic polymers such as hard acrylic polymers or core shell technology polymers or vinyl polymers such as polyvinyl chloride, polyamides or polyurethanes; wherein the binding polymer of the coating is selected from the latex group of acrylate, methacrylate esters, or both. The ester portion of these monomers can be C1-C6 alkyl groups, such as methyl, ethyl, and butyl groups, vinyl ethylene resins;wherein the coynnn / zznz / B / YiAi petrolatum, mineral oils or polyethylene oxides of the release agent are in an emulsified liquid state, with a degree of polymerization between 200 and 400; wherein the emulsifiers of the coating are selected from the group of linear and branched-chain sodium alkylbenzenesulfonates, linear and branched-chain alkyl sulfates, and linear and branched-chain alkyl ethoxy sulfates, alkyl polyethoxylates, polyethoxylated alcohols, fatty acid ethanol amides, sorbitan esters (SPAN), emulsifiers (water / oil) in combination with ethoxylated sorbitan esters (the Tween range), contribute to the overall stability of oil / water emulsions; wherein the stabilizer of the coating is 95% 2-amino-2-methyl-l-propanol; where the preservatives of the coating are selected from the group of chloromethylisothiazolinone derivatives;Where the dry coating layer of the paper is in a range between 5 and 40% by weight, on the total weight of the transfer paper, and the bond or kraft cellulose sheets have basis weights ranging from 45 to 150 g / m2, and the glassine sheets have basis weights ranging from 50 to 90 g / m2.;