Water transfer printing paper and processing method thereof

Abstract

The invention provides water transfer printing paper and a processing method thereof. The processing method of the water transfer printing paper comprises the following steps: obtaining the base material; the base material is subjected to gluing operation, so that a primer coating and a surface glue coating are sequentially attached to one side face of the base material, and preformed water transfer printing paper is obtained; and a mirror surface matching roller and an ultrasonic vibration roller are adopted for carrying out double-roller flattening operation on the preformed water transfer printing paper. According to the processing method of the water transfer printing paper, the production efficiency of the water transfer printing paper can be improved on the basis of ensuring that the surface of the water transfer printing paper is flat and smooth.

Description

Technical Field

[0001] This invention relates to the field of water transfer printing technology, and in particular to a water transfer printing paper and its processing method. Background Technology

[0002] In existing technologies, in order to improve the surface smoothness of water transfer paper to meet the requirements of high-end hot stamping, such as gold foil hot stamping and silver foil hot stamping, otherwise, when hot stamping extremely thin gold foil or silver foil, even tiny defects on the surface of the water transfer paper may lead to imperfect transfer results, resulting in a slight "orange peel" phenomenon or raised marks. Currently, the traditional hot pressing and calendering technology is commonly used to improve the surface smoothness of water transfer paper. This technology uses a pair of heated rigid rollers, specifically including a hot pressing roller and a pressure roller, to apply extremely high linear pressure to the water transfer paper after the substrate has completed the base coating and surface coating. By squeezing and ironing, the surface coating is made flat and smooth, and then hot stamping is performed on the surface coating. Although this meets the requirements of hot stamping, the extremely high linear pressure limits the production speed of water transfer paper. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a water transfer paper and its processing method that can improve the production efficiency of water transfer paper while ensuring a smooth and flat surface.

[0004] The objective of this invention is achieved through the following technical solution: A method for processing water transfer printing paper includes the following steps: Obtain the substrate; The substrate is coated with adhesive to attach a base adhesive coating and a top adhesive coating to one side of the substrate in sequence, thereby obtaining a pre-formed water transfer paper. The pre-formed water transfer paper is flattened by using a mirror-finish roller and an ultrasonic vibrating roller.

[0005] In one embodiment, a mirror-finished roller and an ultrasonic vibrating roller are used to flatten the preformed water transfer paper, with a linear pressure of 30kN / m to 80kN / m.

[0006] In one embodiment, a mirror-finished roller and an ultrasonic vibrating roller are used to flatten the preformed water transfer paper. The ultrasonic vibrating roller has a vibration frequency of 20 kHz to 40 kHz and an amplitude of 3 μm to 15 μm.

[0007] In one embodiment, a mirror-finished roller and an ultrasonic vibrating roller are used to flatten the preformed water transfer paper, and the temperature of the mirror-finished roller is 50°C to 120°C.

[0008] In one embodiment, a mirror-finished roller and an ultrasonic vibrating roller are used to flatten the pre-formed water transfer paper, and the pre-formed water transfer paper moves at a speed of 50m / min to 300m / min between the mirror-finished roller and the ultrasonic vibrating roller.

[0009] In one embodiment, after the step of flattening the pre-formed water transfer paper using a mirror-fitting roller and an ultrasonic vibrating roller, the processing method of the water transfer paper further includes the following steps: The pre-formed water transfer paper is subjected to a cooling and curing process to allow the surface adhesive coating to cool and cure.

[0010] In one embodiment, the adhesive coating operation on the substrate includes the following steps: The substrate is subjected to a primer roller coating treatment to ensure that a primer coating is attached to the substrate. The substrate is subjected to a topcoat roller coating process so that the topcoat coating is attached to the side of the substrate away from the base coating.

[0011] In one embodiment, the substrate is subjected to a primer roller coating treatment with a coating pressure of a; The substrate is subjected to a surface coating treatment with a coating pressure of b. Where a < b, so that the coating density of the primer coating is less than the coating density of the topcoat coating.

[0012] In one embodiment, 'a' is 0.5 kg to 0.8 kg.

[0013] In one embodiment, b is 2.5 kg to 3 kg.

[0014] In one embodiment, the substrate is subjected to a primer roller coating treatment, and the linear speed of the coating roller is 150m / min to 320m / min.

[0015] In one embodiment, the substrate is subjected to a surface coating process using a roller, with the linear speed of the coating roller being 150 m / min to 320 m / min.

[0016] In one embodiment, after the step of flattening the pre-formed water transfer paper using a mirror-fitting roller and an ultrasonic vibrating roller, the processing method of the water transfer paper further includes the following steps: The preformed water transfer paper is subjected to a base coat treatment so that a carrier varnish layer is attached to the side of the top adhesive coating away from the base coating.

[0017] In one embodiment, the carrier varnish layer includes a first varnish layer and a second varnish layer, the first varnish layer being attached to the side of the surface coating away from the first coating, the second varnish layer being attached to the side of the first varnish layer away from the surface coating, and the coating density of the first varnish layer being greater than the coating density of the second varnish layer.

[0018] A water transfer printing paper is obtained by the water transfer printing paper processing method described in any of the above embodiments. The water transfer printing paper includes a substrate, a base coating, and a top coating. The base coating is sandwiched between the substrate and the top coating. The substrate, the base coating, and the top coating are configured as a single unit and formed by compaction between the mirror-fitting roller and the ultrasonic vibration roller.

[0019] Compared with the prior art, the present invention has at least the following advantages: The processing method of the water transfer printing paper of the present invention involves a mirror-finished roller contacting the pre-formed water transfer printing surface coating, which initially and effectively improves the smoothness of the surface coating after the pre-formed water transfer printing paper is flattened. Combined with an ultrasonic vibrating roller contacting the pre-formed water transfer printing substrate, the ultrasonic vibrating roller transmits micro-vibrations to the surface coating, reducing friction between the molecular chains of the surface coating and causing a significant instantaneous decrease in apparent viscosity. This makes the surface coating flow more easily, like a fluid, thus better filling the microscopic depressions on the surface of the surface coating. Furthermore, part of the vibration energy of the surface coating is converted into heat energy, generating a high local instantaneous temperature inside the surface coating, further promoting the softening and leveling of the coating. Through the synergy of "mirror-finished contact," "micro-vibration," and "roller flattening," the surface smoothness of the surface coating is further improved. Moreover, the surface smoothness of the surface coating can be maintained even with reduced linear pressure during roller flattening, thereby effectively improving the production efficiency of water transfer printing paper. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a diagram showing the state of the water transfer paper obtained in Example 8 when it is not in use; Figure 2 This is a diagram showing the state of the water transfer paper obtained in Example 8 when it is laid out and immersed in water. Figure 3 This is a diagram showing the state of the water transfer paper obtained in Example 8 being applied to the surface of a cup. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the embodiments and examples. It should be understood that these embodiments and examples are for illustrative purposes only and are not intended to limit the scope of the present application. The purpose of providing these embodiments and examples is to enable a more thorough and comprehensive understanding of the disclosure of the present application. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various modifications or alterations without departing from the spirit of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. Furthermore, numerous specific details are set forth in the following description to provide a fuller understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0025] In this invention, numerical intervals (i.e., numerical ranges) are involved. Unless otherwise specified, the selected numerical distributions within the aforementioned numerical intervals are considered continuous, and include the two endpoints (i.e., the minimum and maximum values) of the numerical range, as well as every value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints. In this document, this is equivalent to directly listing every integer. For example, if t is an integer selected from 1 to 10, it means that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Furthermore, when multiple ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0026] Unless otherwise specified, the temperature parameters in this invention can be either constant temperature treatment or vary within a certain temperature range. It should be understood that constant temperature treatment allows temperature fluctuations within the precision range controlled by the instrument. Fluctuations are permitted within ranges such as ±5℃, ±4℃, ±3℃, ±2℃, and ±1℃.

[0027] This application provides a method for processing water transfer printing paper. The method for processing water transfer printing paper includes the following steps: obtaining a substrate; applying adhesive to the substrate so that a base adhesive coating and a top adhesive coating are sequentially attached to one side of the substrate to obtain pre-formed water transfer printing paper; and using a mirror-finish roller and an ultrasonic vibrating roller to flatten the pre-formed water transfer printing paper.

[0028] The aforementioned water transfer paper processing method involves a mirror-finished roller contacting the pre-formed water transfer paper's surface coating. This initially and effectively improves the smoothness of the surface coating after the pre-formed water transfer paper is flattened. Combined with an ultrasonic vibrating roller contacting the pre-formed water transfer paper's substrate, the ultrasonic vibrating roller transmits micro-vibrations to the surface coating, reducing friction between the molecular chains and drastically lowering the apparent viscosity. This makes the surface coating flow more easily, like a fluid, thus better filling the microscopic depressions on the surface coating. Furthermore, some of the vibrational energy of the surface coating is converted into heat, generating a high local instantaneous temperature within the coating, further promoting softening and leveling. The synergy of "mirror-finished contact," "micro-vibration," and "roller flattening" further enhances the surface smoothness of the surface coating. This surface smoothness is maintained even with reduced linear pressure during roller flattening, effectively improving the production efficiency of water transfer paper.

[0029] To better understand the processing method of the water transfer printing paper of this application, the processing method of the water transfer printing paper of this application will be further explained below: One embodiment of the water transfer printing paper processing method includes the following steps: S100. Obtaining the substrate. It is understood that the substrate is the base material of conventional water transfer printing paper. In one embodiment, the substrate includes a pulp-paper substrate and an accelerator substrate, with the accelerator substrate sandwiched between the pulp-paper substrate and the primer coating. Further, the pulp-paper substrate includes softwood pulp, hardwood pulp, and kaolin filler. Further, the accelerator substrate is a kaolin calcium carbonate coating. It is understood that the substrate is the base material of conventional water transfer printing paper; therefore, this application will not elaborate further on it here.

[0030] S200: A coating operation is performed on the substrate to sequentially attach a base coating and a top coating to one side of the substrate, thereby obtaining a pre-formed water transfer paper. It is understood that the base coating is the same as that of conventional water transfer paper, and the top coating is also the same as that of conventional water transfer paper. In one embodiment, the base coating comprises wheat starch and water. Further, the base coating can be obtained according to existing conventional preparation methods; therefore, details of the base coating will not be elaborated here. In one embodiment, the top coating comprises corn maltodextrin and water. Further, the top coating can be obtained according to existing conventional preparation methods; therefore, details of the top coating will not be elaborated here.

[0031] S300: A mirror-finish roller and an ultrasonic vibrating roller are used to flatten the pre-formed water transfer paper. Further, the surface roughness Ra of the mirror-finish roller is ≤0.1μm. It can be understood that the mirror-finish roller has high surface flatness, allowing it to press against the surface coating of the pre-formed water transfer paper in a mirror-like contact manner. This effectively improves the smoothness of the surface coating after flattening. The ultrasonic vibrating roller, in conjunction with the pre-formed water transfer paper substrate, applies micro-vibrations to the surface coating, reducing friction between molecular chains and instantly lowering the apparent viscosity. The significantly reduced gap makes the surface coating flow more easily, like a fluid, thus better filling the microscopic depressions on the surface of the surface coating. In addition, part of the vibration energy of the surface coating is converted into heat energy, generating a high local instantaneous temperature inside the surface coating, which further promotes the softening and leveling of the coating. With the synergy of "mirror contact", "micro-vibration" and "roller flattening", the surface smoothness of the surface coating is further improved. Moreover, the surface smoothness of the surface coating can be ensured even with a reduction in the linear pressure of the roller flattening, thereby effectively improving the production efficiency of water transfer printing paper.

[0032] The aforementioned water transfer paper processing method involves a mirror-finished roller contacting the pre-formed water transfer paper's surface coating. This initially and effectively improves the smoothness of the surface coating after the pre-formed water transfer paper is flattened. Combined with an ultrasonic vibrating roller contacting the pre-formed water transfer paper's substrate, the ultrasonic vibrating roller transmits micro-vibrations to the surface coating, reducing friction between the molecular chains and drastically lowering the apparent viscosity. This makes the surface coating flow more easily, like a fluid, thus better filling the microscopic depressions on the surface coating. Furthermore, some of the vibrational energy of the surface coating is converted into heat, generating a high local instantaneous temperature within the coating, further promoting softening and leveling. The synergy of "mirror-finished contact," "micro-vibration," and "roller flattening" further enhances the surface smoothness of the surface coating. This surface smoothness is maintained even with reduced linear pressure during roller flattening, effectively improving the production efficiency of water transfer paper.

[0033] In one embodiment, a mirror-finished roller and an ultrasonic vibrating roller are used to flatten the pre-formed water transfer paper, with a linear pressure of 30 kN / m to 80 kN / m. Further, the ultrasonic vibrating roller is used to flatten the pre-formed water transfer paper, with a vibration frequency of 20 kHz to 40 kHz and an amplitude of 3 μm to 15 μm. It can be understood that compared to traditional hot-pressing calendering technology, the linear pressure can be reduced by at least 30% while achieving a similar smoothness for the surface coating. The combination of a linear pressure of 30 kN / m to 80 kN / m between the mirror-finished roller and the ultrasonic vibrating roller, along with a vibration frequency of 20 kHz to 40 kHz and an amplitude of 3 μm to 15 μm, effectively ensures the smoothness of the surface coating, thus achieving a simultaneous improvement in the water solubility and smoothness of the water transfer paper.

[0034] In one embodiment, a mirror-finish roller and an ultrasonic vibrating roller are used to flatten the pre-formed water transfer paper. The temperature of the mirror-finish roller is 50°C to 120°C. It can be understood that maintaining the temperature of the mirror-finish roller at 50°C to 120°C enhances the plastic flow of the surface coating, which helps to further improve the smoothness of the water transfer paper.

[0035] In one embodiment, a mirror-finished roller and an ultrasonic vibrating roller are used to flatten the pre-formed water transfer paper. The pre-formed water transfer paper moves between the mirror-finished roller and the ultrasonic vibrating roller at a speed of 50 m / min to 300 m / min.

[0036] In one embodiment, after the step of flattening the pre-formed water transfer paper using a mirror-fitting roller and an ultrasonic vibrating roller, the water transfer paper processing method further includes the following step: cooling and curing the pre-formed water transfer paper to cool and cure the surface coating, thereby accelerating the curing speed of the surface coating and achieving a glossy surface with high gloss and high smoothness.

[0037] In one embodiment, the adhesive coating operation on the substrate includes the following steps: The substrate is subjected to a primer roller coating treatment to ensure that a primer coating is adhered to the substrate. The primer roller coating process involves: metering the primer coating material → precise quantitative extrusion metering for micro-coating → drying the primer coating. This is a conventional method for forming a primer coating on water transfer printing paper, and therefore, this application will not elaborate further on it here.

[0038] Furthermore, the substrate undergoes a surface coating process using rollers to coat it with an adhesive, so that the base coat adheres to the side of the substrate away from the base coat. The roller coating process involves the following steps: metering the adhesive coating material → precise quantitative extrusion metering for micro-coating → drying the adhesive coating. This is a standard method for forming an adhesive coating on water transfer paper, and therefore, it will not be described in detail here.

[0039] In one embodiment, the coating amount of the primer is 6 g / m². 2 ~8g / m 2 Furthermore, the coating amount of the surface adhesive is 1 g / m². 2 ~2g / m 2 .

[0040] It should be noted that using traditional hot-pressing calendering technology to improve the smoothness of water transfer paper results in excessive compaction of the substrate, base coating, and top coating due to the extremely high linear pressure applied for high smoothness. This sacrifices the bulk of the water transfer paper, making it difficult for water to penetrate quickly and evenly into the paper. Consequently, the water transfer speed is slow, and it may even affect the integrity of the transfer, namely, the water solubility and transfer integrity of the paper. In other words, there is an irreconcilable contradiction between high smoothness and good physical properties when using traditional hot-pressing calendering technology to improve the smoothness of water transfer paper. It is difficult to simultaneously meet the dual requirements of the hot stamping industry for high surface smoothness of water transfer paper and the physical properties of water transfer paper for the transfer process. In this application, the surface smoothness of the top-coating is ensured by reducing the linear pressure of the roller flattening under the combined action of the ultrasonic vibrating roller and the mirror-finishing roller. This also reduces the increase in compaction density after roller compaction when the pre-formed water transfer paper achieves the required surface smoothness, thus initially improving the water solubility of the water transfer paper. However, the actual water solubility of the water transfer paper is still significantly affected, leading to a decrease in the transfer efficiency. To further ensure the water solubility and transfer integrity of the water transfer paper while maintaining the smoothness of the top-coating, in one embodiment, the substrate undergoes a base coat coating with a pressure of 'a'; and a top coat coating with a pressure of 'b'; wherein 'a' < 'b', so that the coating density of the base coat is less than that of the top coat. Further, 'a' < 1 kg. Further, 'a' is 0.5 kg to 0.8 kg. Further, 'b' is 2.5 kg to 3 kg.

[0041] It is understandable that the coating density of the base coating is lower than that of the top coating, and the coating density of the base coating is also lower than that of a conventional base coating. Consequently, when the substrate, base coating, and top coating are flattened using mirror-finish rollers and ultrasonic vibrating rollers, the lower coating density of the base coating results in lower compressive strength under pressure. This means that the base coating bears more pressure from the rollers, thus providing a buffering effect during the flattening of the pre-formed water transfer paper. This reduces the overall compaction density of the pre-formed water transfer paper, thereby improving its water solubility. In addition, the relatively high coating density of the top coating ensures its surface smoothness.

[0042] It should be noted that if the coating density of the surface adhesive coating is reduced, there will be more microscopic defects on the surface of the surface adhesive coating, which in turn will require a higher linear pressure during the roller flattening operation in order to achieve a smooth surface of the surface adhesive coating.

[0043] In one embodiment, the substrate is subjected to a primer roller coating treatment, and the linear speed of the coating roller is 150m / min to 230m / min.

[0044] In one embodiment, the substrate is subjected to a surface coating process using a coating roller, with the linear speed of the coating roller being 150 m / min to 230 m / min.

[0045] In one embodiment, after the step of flattening the preformed water transfer paper using a mirror-fitting roller and an ultrasonic vibrating roller, the water transfer paper processing method further includes the following step: applying a base coat to the preformed water transfer paper so that a carrier varnish layer is attached to the side of the top coating away from the base coating.

[0046] In one embodiment, the carrier varnish layer includes a first varnish layer and a second varnish layer. The first varnish layer is attached to the side of the topcoat coating away from the basecoat coating, and the second varnish layer is attached to the side of the first varnish layer away from the topcoat coating. The coating density of the first varnish layer is greater than that of the second varnish layer. It is understood that the difference in coating density can be achieved using conventional varnish layer formation methods. Therefore, it will not be elaborated upon again, but only one method will be briefly described: the first varnish layer is prepared with a ratio of 80% basecoat + 20% solvent diluent, thoroughly mixed, and then applied to the surface of the topcoat coating by screen printing; the second varnish layer is prepared with a ratio of 50% basecoat + 50% solvent diluent, thoroughly mixed, and then applied to the dried surface of the first varnish layer by screen printing.

[0047] It is understandable that the higher coating density of the first varnish layer provides stable support and load-bearing capacity for the hot-stamped metal foil on the surface coating, ensuring a relatively smooth supporting surface during hot-stamping. Furthermore, the lower coating density of the second varnish layer allows the metal foil to more easily penetrate and contact the foil during hot-stamping, thus supporting more foil. This further reduces the requirement for smoothness of the surface coating during hot-stamping, achieving the desired surface smoothness while reducing the linear pressure of the rollers. This effectively improves the production efficiency of water transfer paper and simultaneously enhances its water solubility.

[0048] In one embodiment, the coating amount of the first varnish layer is 1.5 g / m². 2 ~2g / m 2 Furthermore, the coating weight of the second varnish layer is 0.5 g / m². 2 ~1g / m 2 It is understood that both the first and second varnish layers are carrier structures for printing patterns coated on the top coat in water transfer printing. Specifically, the first and second varnish layers formed on the top coat have the same material composition, both being base oils commonly used in water transfer printing paper. Therefore, this application will not elaborate further on this point.

[0049] In one embodiment, a first varnish layer is formed on the surface coating by screen printing and drying. A second varnish layer is formed on the first varnish layer by screen printing and drying. It is understood that the methods for forming the first and second varnish layers are the same as those for forming conventional varnish layers in water transfer paper; therefore, this application will not elaborate further on these methods.

[0050] This application also provides a water transfer printing paper, which is obtained by the processing method of any of the above embodiments. To better understand the water transfer printing paper of this application, the following explanation is provided: One embodiment of the water transfer printing paper includes a substrate, a base coating, and a top coating, with the base coating sandwiched between the substrate and the top coating. The substrate, base coating, and top coating are configured as a single unit and formed by compaction between a mirror-fitting roller and an ultrasonic vibrating roller. Further, in this embodiment, the processing method of the water transfer printing paper includes the following steps: obtaining a substrate; applying adhesive to the substrate so that a base coating and a top coating are sequentially attached to one side of the substrate to obtain pre-formed water transfer printing paper; and flattening the pre-formed water transfer printing paper using a mirror-fitting roller and an ultrasonic vibrating roller.

[0051] In one embodiment, the water transfer paper further includes a carrier varnish layer, which is attached to the side of the surface coating away from the base coating after being formed by compaction between a mirror-fitting roller and an ultrasonic vibrating roller, where the substrate, base coat, and top coat are configured together. Further, the carrier varnish layer includes a first varnish layer and a second varnish layer, the first varnish layer being attached to the side of the surface coating away from the base coat, and the second varnish layer being attached to the side of the first varnish layer away from the surface coating. The coating density of the first varnish layer is greater than that of the second varnish layer.

[0052] Compared with the prior art, the present invention has at least the following advantages: The processing method of the water transfer printing paper of the present invention involves a mirror-finished roller contacting the pre-formed water transfer printing surface coating, which initially and effectively improves the smoothness of the surface coating after the pre-formed water transfer printing paper is flattened. Combined with an ultrasonic vibrating roller contacting the pre-formed water transfer printing substrate, the ultrasonic vibrating roller transmits micro-vibrations to the surface coating, reducing friction between the molecular chains of the surface coating and causing a significant instantaneous decrease in apparent viscosity. This makes the surface coating flow more easily, like a fluid, thus better filling the microscopic depressions on the surface of the surface coating. Furthermore, part of the vibration energy of the surface coating is converted into heat energy, generating a high local instantaneous temperature inside the surface coating, further promoting the softening and leveling of the coating. Through the synergy of "mirror-finished contact," "micro-vibration," and "roller flattening," the surface smoothness of the surface coating is further improved. Moreover, the surface smoothness of the surface coating can be maintained even with reduced linear pressure during roller flattening, thereby effectively improving the production efficiency of water transfer printing paper.

[0053] The embodiments of this application will be described in detail below with reference to examples. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. For experimental methods in the following embodiments where specific conditions are not specified, please refer to the guidelines given in this application, or follow experimental manuals or conventional conditions in the art, or follow the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0054] In the specific embodiments described below, the measurement parameters involving raw material components may have slight deviations within the weighing accuracy range unless otherwise specified. Temperature and time parameters are subject to acceptable deviations due to instrument testing accuracy or operational precision.

[0055] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0056] Example 1 Obtain standard water transfer printing paper, which includes a substrate, a base coating, and a top coating, wherein the base coating has a coating weight of 6 g / m². 2 The coating amount of the surface adhesive is 1g / m². 2 In addition, the application pressure for the base coat is 1.5 kg, and the application pressure for the top coat is 3.5 kg. The water transfer paper is flattened by a mirror-finish roller and an ultrasonic vibrating roller. The linear pressure is 30 kN / m. The water transfer paper moves at a speed of 50 m / min between the mirror-finish roller and the ultrasonic vibrating roller. The vibration frequency of the ultrasonic vibrating roller is 20 kHz and the amplitude is 3 μm. The temperature of the mirror-finish roller is 50℃. A coating amount of 2g / m is formed on the surface adhesive coating. 2 A varnish layer is applied, followed by hot stamping of metallic foil.

[0057] Example 2 The differences from Example 1 are as follows: The water transfer paper is flattened by a mirror-finish roller and an ultrasonic vibrating roller. The linear pressure is 50 kN / m. The water transfer paper moves at a speed of 200 m / min between the mirror-finish roller and the ultrasonic vibrating roller. The ultrasonic vibrating roller has a vibration frequency of 30 kHz and an amplitude of 8 μm. The temperature of the mirror-finish roller is 90 ℃.

[0058] Example 3 The differences from Example 1 are as follows: The water transfer paper is flattened by a mirror-finish roller and an ultrasonic vibrating roller. The linear pressure is 80 kN / m. The water transfer paper moves at a speed of 300 m / min between the mirror-finish roller and the ultrasonic vibrating roller. The ultrasonic vibrating roller has a vibration frequency of 40 kHz and an amplitude of 3 μm. The temperature of the mirror-finish roller is 120 ℃.

[0059] Example 4 The differences from Example 2 are as follows: Obtain standard water transfer printing paper, which includes a substrate, a base coating, and a top coating, wherein the base coating has a coating weight of 8 g / m². 2 The coating amount of the surface adhesive is 2g / m². 2 In addition, the application pressure for the base coat is 1.5 kg, and the application pressure for the top coat is 3.5 kg. A coating amount of 3g / m² is formed on the surface adhesive coating. 2 A varnish layer is applied, followed by hot stamping of metallic foil.

[0060] Example 5 The differences from Example 2 are as follows: Obtain standard water transfer printing paper, which includes a substrate, a base coating, and a top coating, wherein the base coating has a coating weight of 6 g / m². 2 The coating amount of the surface adhesive is 1g / m². 2 In addition, the application pressure of the base coat is 0.5 kg, and the application pressure of the top coat is 2.5 kg.

[0061] Example 6 The differences from Example 5 are as follows: Obtain standard water transfer printing paper, which includes a substrate, a base coating, and a top coating, wherein the base coating has a coating weight of 6 g / m². 2 The coating amount of the surface adhesive is 1g / m². 2 In addition, the application pressure of the base coat is 0.6 kg, and the application pressure of the top coat is 2.8 kg.

[0062] Example 7 The differences from Example 5 are as follows: Obtain standard water transfer printing paper, which includes a substrate, a base coating, and a top coating, wherein the base coating has a coating weight of 6 g / m². 2 The coating amount of the surface adhesive is 1g / m². 2 In addition, the application pressure for the base coat is 0.8 kg, and the application pressure for the top coat is 3 kg.

[0063] Example 8 The differences from Example 6 are as follows: The first coat of varnish is prepared by mixing 80% base coat and 20% solvent thinner, thoroughly stirring until homogeneous. Then, it is applied to the surface of the topcoat coating using screen printing and dried to achieve a coating weight of 2 g / m². 2 The first varnish layer is applied, followed by a second varnish layer prepared with a 50% base coat and 50% solvent thinner mixture. This mixture is thoroughly stirred and blended, then screen-printed onto the dried surface of the first varnish layer to achieve a coating weight of 0.5 g / m². 2 The second varnish layer is applied, and then metal foil is hot-stamped onto the second varnish layer.

[0064] Example 9 The differences from Example 8 are as follows: The first coat of varnish is prepared by mixing 80% base coat and 20% solvent thinner. After thorough mixing, the varnish is applied to the surface of the topcoat coating using screen printing and allowed to dry, resulting in a coating weight of 1.8 g / m². 2The first varnish layer is applied, followed by a second varnish layer prepared with a 50% base coat and 50% solvent thinner mixture. This mixture is thoroughly stirred and blended, then screen-printed onto the dried surface of the first varnish layer to achieve a coating weight of 0.8 g / m². 2 The second varnish layer is applied, followed by hot stamping of metal foil.

[0065] Example 10 The differences from Example 8 are as follows: The first layer of varnish is prepared by mixing 80% base coat and 20% solvent thinner. After thorough mixing, the first layer of varnish is applied to the surface of the topcoat coating using screen printing and then dried, resulting in a coating weight of 1.5 g / m². 2 The first varnish layer is applied, followed by a second varnish layer prepared with a 50% base coat and 50% solvent thinner mixture. This mixture is thoroughly stirred and blended, then screen-printed onto the dried first varnish layer to create a coating of 1 g / m² on top of the surface adhesive. 2 The second varnish layer is applied, followed by hot stamping of metal foil.

[0066] Comparative Example 1 The differences from Example 2 are as follows: The water transfer paper is flattened by a mirror roller and a mating roller. The linear pressure is 120 kN / m. The water transfer paper moves at a speed of 80 m / min between the mirror roller and the mating roller. The temperature of the mating roller is 90℃.

[0067] The smoothness of the surface coating, the integrity of the hot stamping foil, and the transfer effect of the water transfer paper obtained in Examples 1-10 and Comparative Example 1 are recorded and analyzed as follows: In the water transfer paper obtained in Examples 1 to 4, the hot stamping base film is thin, soft and smooth, the average hot stamping foil pigment transfer rate is 95%, the hot stamping pattern has good smoothness, but there are some minor bumps and dents, and the average time for bubble flower removal and transfer is 20 seconds. In the water transfer paper obtained in Examples 5 to 7, the hot stamping base film is thin, soft and smooth, the average hot stamping foil pigment transfer rate is 96%, the hot stamping pattern has good smoothness, but there are very few tiny bumps and marks, and the average bubble flower removal and transfer time is 15 seconds. Among them, the water transfer paper obtained in Example 6 has the shortest bubble flower removal and transfer time. In the water transfer paper obtained in Examples 8 to 10, the hot stamping base film is thin, soft and smooth, the average hot stamping foil pigment transfer rate is 99%, the hot stamping pattern has better smoothness, the hot stamping pattern is smooth and complete, and the average bubble flower removal and transfer time is 15s. Among them, the water transfer paper obtained in Example 8 has the shortest bubble flower removal and transfer time. In the water transfer paper obtained in Comparative Example 1, the hot stamping base film is thin, soft and smooth, the average transfer rate of hot stamping foil pigment is 95%, the hot stamping pattern has good smoothness, but there are some minor bumps and dents, and the average time for bubble flower removal and transfer is 80s.

[0068] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for processing water transfer printing paper, characterized in that, Includes the following steps: Obtain the substrate; The substrate is coated with adhesive to attach a base adhesive coating and a top adhesive coating to one side of the substrate in sequence, thereby obtaining a pre-formed water transfer paper. The pre-formed water transfer paper is flattened by using a mirror-finish roller and an ultrasonic vibrating roller.

2. The processing method for water transfer printing paper according to claim 1, characterized in that, The pre-formed water transfer paper is flattened using a mirror-finish roller and an ultrasonic vibrating roller, with a linear pressure of 30 kN / m to 80 kN / m; and / or, The pre-formed water transfer paper is flattened using a mirror-finish roller and an ultrasonic vibrating roller. The ultrasonic vibrating roller has a vibration frequency of 20 kHz to 40 kHz and an amplitude of 3 μm to 15 μm; and / or, The pre-formed water transfer paper is flattened using a mirror-finish roller and an ultrasonic vibrating roller, wherein the temperature of the mirror-finish roller is 50℃~120℃; and / or, The pre-formed water transfer paper is flattened by a mirror-finished roller and an ultrasonic vibrating roller. The moving speed of the pre-formed water transfer paper between the mirror-finished roller and the ultrasonic vibrating roller is 50m / min to 300m / min.

3. The processing method for water transfer printing paper according to claim 1, characterized in that, After the step of flattening the pre-formed water transfer paper using mirror-finish rollers and ultrasonic vibrating rollers, the processing method of the water transfer paper further includes the following steps: The pre-formed water transfer paper is subjected to a cooling and curing process to allow the surface adhesive coating to cool and cure.

4. The processing method for water transfer printing paper according to claim 1, characterized in that, The adhesive coating process for the substrate includes the following steps: The substrate is subjected to a primer roller coating treatment to ensure that a primer coating is attached to the substrate. The substrate is subjected to a topcoat roller coating process so that the topcoat coating is attached to the side of the substrate away from the base coating.

5. The processing method for water transfer printing paper according to claim 4, characterized in that, The substrate is subjected to a primer roller coating treatment at a coating pressure of a; The substrate is subjected to a surface coating treatment with a coating pressure of b. Where a < b, so that the coating density of the primer coating is less than the coating density of the topcoat coating.

6. The processing method for water transfer printing paper according to claim 5, characterized in that, The value of 'a' is 0.5 kg to 0.8 kg; and / or, The value of b is 2.5 kg to 3 kg.

7. The processing method for water transfer printing paper according to claim 4, characterized in that, The substrate is subjected to a primer roller coating treatment, with the linear speed of the coating roller being 150 m / min to 320 m / min; and / or, The substrate is subjected to a surface coating treatment using a coating roller, with the linear speed of the coating roller being 150m / min to 320m / min.

8. The processing method for water transfer printing paper according to claim 1, characterized in that, After the step of flattening the pre-formed water transfer paper using mirror-finish rollers and ultrasonic vibrating rollers, the processing method of the water transfer paper further includes the following steps: The preformed water transfer paper is subjected to a base coat treatment so that a carrier varnish layer is attached to the side of the top adhesive coating away from the base coating.

9. The processing method for water transfer printing paper according to claim 8, characterized in that, The carrier varnish layer includes a first varnish layer and a second varnish layer. The first varnish layer is attached to the side of the surface coating away from the first coating, and the second varnish layer is attached to the side of the first varnish layer away from the surface coating. The coating density of the first varnish layer is greater than the coating density of the second varnish layer.

10. A water transfer printing paper, characterized in that, The water transfer paper is processed by the processing method of any one of claims 1 to 9, the water transfer paper comprising a substrate, a base coating and a top coating, the base coating being sandwiched between the substrate and the top coating, characterized in that the substrate, the base coating and the top coating are configured as one and formed by compaction between the mirror mating roller and the ultrasonic vibrating roller.

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