Water transfer printing paper for bright film-free mark, preparation method of water transfer printing paper and bright film-free mark

Abstract

The invention provides water transfer printing paper for a bright film-free label, a preparation method of the water transfer printing paper and the bright film-free label. The water transfer printing paper comprises backing paper and a surface glue layer, wherein the surface glue layer comprises 15-30 parts of industrial potato starch; 0.1 to 1 part of a sodium alginate solution; 0.1 to 1 part of a polyvinyl alcohol solution; 95 to 100 parts of water; wherein the thermal viscosity of the industrial potato starch subjected to high-temperature gelatinization is 1600 mpa.s to 1800 mpa.s, and the length of pasted filaments of the industrial potato starch is 10 cm to 20 cm. The water transfer printing paper is simple in formula type, low in price and easy to operate; and the surface glue coating with high thermal viscosity, high paste silk content and high overall transparency is formed after high-temperature gelatinization, so that the smoothness of the surface glue of the water transfer paper can reach more than 5000S, pits on the surface of a pattern layer are reduced, the pattern layer with high surface smoothness and good uniformity is obtained, and the water transfer paper has the advantages of simple process, low cost and the like. And the soft, light, thin and bright printing requirements of the bright film-free water gauge are well met.

Description

Technical Field

[0001] The present invention relates to the technical field of producing water transfer paper for glossy filmless labels, and in particular to water transfer paper for glossy filmless labels, a preparation method thereof, and a glossy filmless label. Background Art

[0002] Water transfer printing is a common printing process at present. In the water transfer printing process, the pigment is first printed on the surface glue layer of the water transfer paper through the printing equipment to form a pattern and dry it to obtain the water transfer printing paper; then, the back of the water transfer printing paper is exposed to water to allow the water to penetrate the water transfer paper to completely dissolve the pattern of the surface glue layer, and finally the transfer printing is performed on the target object to form a complete and exquisite pattern.

[0003] In the past two years, due to the thin, soft and bright characteristics of glossy film-free labels, they can fit tightly with sports equipment without leaving any uneven marks, thus achieving a seamless integration with the sports equipment, and therefore have been widely used in sports equipment.

[0004] In the process of water transfer of glossy filmless marks, the surface smoothness of water transfer printing paper currently on the market is generally 600S-1600S, which leads to the problem of low surface smoothness of water transfer printing paper. As a result, the glossy filmless marks are prone to uneven ink distribution, inconsistent light transmittance, brightness differences and other problems during the printing process.

[0005] At present, some conventional practices solve the problem of inconsistent transmittance by increasing the ink concentration, which not only increases the printing cost, but also causes the thickness of the glossy filmless label to become thicker, affecting the light, thin and soft characteristics of the glossy filmless label. Some scholars also change the coating composition of water transfer printing paper, such as Chinese document No. CN 113882189 A discloses a transfer printing paper, which effectively improves the ink transfer rate and paper smoothness by compounding multiple materials such as sodium alginate, calcium stearate, silane coupling agent, styrene acrylic latex, modified starch, graphene oxide and titanium dioxide.

[0006] However, the above water transfer printing paper has the problem of complex formula types and high price. In addition, although the above water transfer printing improves the smoothness of the coating composition, the improvement of the smoothness of the coating composition is limited, that is, it cannot exceed 5000S, resulting in obvious pits between the pattern and the target object after water transfer printing, resulting in obvious concave and convex marks on the pattern, such as Figure 2 As shown, it still cannot meet the printing requirements of bright film-free water labels. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a surface adhesive coating with fewer formula types and lower price. After high-temperature gelatinization, the coating has higher thermal viscosity, higher paste fibers and higher overall transparent color, while also making the smoothness of the surface adhesive reach more than 5000S, ensuring that the surface adhesive layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, and at the same time reducing the fine concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, light and bright printing of glossy filmless water marks, and also ensures the connection strength between the surface adhesive layer and the base paper, and is also conducive to the rapid dissolution and peeling of the base paper of the surface adhesive layer during the water transfer process, and also ensures that a uniform surface adhesive layer is obtained by coating, and also avoids the water transfer paper for glossy filmless marks and its preparation method, as well as glossy filmless marks that are prone to cracking of the surface adhesive layer.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] A water transfer paper for bright film-free labeling, comprising a base paper and a surface glue layer, wherein the surface glue layer comprises the following mass components:

[0010]

[0011] The thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600 mpa·s to 1800 mpa·s, and the length of the paste thread of the industrial potato starch is 10 cm to 20 cm.

[0012] In one embodiment, the top glue layer includes the following mass components:

[0013]

[0014] In one embodiment, the granularity of the industrial potato starch is 30 μm to 40 μm, and the fineness is 100 μm to 180 μm.

[0015] A method for preparing water transfer paper for bright and filmless labels, the method comprising the following steps:

[0016] Industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water are mixed to obtain starch milk;

[0017] The starch emulsion is subjected to high temperature gelatinization to obtain a surface glue coating; wherein the thermal viscosity of the industrial potato starch after high temperature gelatinization is 1600mpa·s to 1800mpa·s, and the length of the paste thread of the industrial potato starch is 10cm to 20cm;

[0018] Applying the surface glue coating on the base paper;

[0019] The coated base paper is dried to obtain the water transfer paper for the glossy film-free label as described in any of the above embodiments.

[0020] In one embodiment, the high temperature gelatinization comprises the following specific steps:

[0021] The starch milk is subjected to a low-speed stirring and heating operation, and the pregelatinization time of the starch milk is controlled to be 28 minutes to 30 minutes, and the pregelatinization temperature is controlled to be 60° C. to 68° C. to obtain pregelatinized starch;

[0022] The pregelatinized starch is subjected to a slow stirring and heating operation, and the high temperature time of the pregelatinized starch is controlled to be 2 minutes to 8 minutes, and the high temperature gelatinization temperature is 80° C. to 85° C., to obtain the surface glue coating.

[0023] In one embodiment, the low-speed stirring speed is 15 rpm to 30 rpm.

[0024] In one embodiment, the slow stirring speed is no more than 10 rpm.

[0025] In one embodiment, in the step of mixing industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water, the order of adding the materials is: the water>the polyvinyl alcohol solution>the sodium alginate solution>the industrial potato starch.

[0026] A glossy filmless mark comprises a pattern layer and water transfer paper for the glossy filmless mark, wherein the pattern layer is arranged on a surface adhesive layer of the water transfer paper for the glossy filmless mark, and the water transfer paper for the glossy filmless mark is prepared by the preparation method of the water transfer paper for the glossy filmless mark described in any of the above embodiments.

[0027] Compared with the prior art, the present invention has at least the following advantages:

[0028] 1) Due to the high content of amylopectin in industrial potato starch, the binding force between amylopectin molecules is strong, so that a tighter gel network structure is formed during high-temperature gelatinization. At the same time, a small amount of polyvinyl alcohol solution is used to ensure that a surface glue coating with high thermal viscosity, high paste fibers and high overall transparency is formed after high-temperature gelatinization. That is, the thermal viscosity of industrial potato starch after high-temperature gelatinization is 1600mpa·s~1800mpa·s, and the length of the paste fibers is 10cm~20cm, thereby ensuring the connection strength and film-forming property of the surface glue layer and the base paper, and the overall high transparency is conducive to improving the restoration degree of the bright film-free pattern layer, so as to ensure the formation of a light, soft and bright pattern layer, effectively eliminating the problem that the traditional surface glue layer has poor overall thermal viscosity due to the addition of corn starch, wheat starch and sorghum starch, which affects the connection strength, film-forming property and overall transparency of the surface glue layer.

[0029] 2) Due to the high-temperature gelatinization, a surface adhesive coating with high thermal viscosity, high paste silk and high overall transparent color is formed. While effectively reducing the use of sodium alginate solution, it also improves the leveling and fluidity of the surface adhesive coating, thereby ensuring that the surface adhesive coating can quickly level on the base paper, effectively improving the smoothness and uniformity of the surface adhesive of the water transfer paper, so that the smoothness of the surface adhesive of the water transfer paper can reach more than 5000S, ensuring that the surface adhesive layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, and at the same time reducing the subtle concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, thin and bright printing of glossy film-free water marks.

[0030] 3) Since the formula disclosed in the present invention is simple in type and low in price, the production cost of water transfer paper for bright film-free labels is effectively reduced, and the operation is simple.

[0031] 4) The traditional method of improving the reproducibility of the pattern layer by adding titanium dioxide, that is, the transparency of the traditional coating composition is poor, which affects the reproducibility of the pattern layer and cannot achieve the effect of being integrated with the sports equipment. However, the present invention adopts a top coat layer with high overall transparency, which is conducive to printing and forming a thin, soft and bright pattern layer, and well achieves the effect of the pattern being integrated with the sports equipment.

[0032] 5) Since the thermal viscosity of industrial potato starch after high-temperature gelatinization is 1600mpa·s~1800mpa·s and the length of the paste thread is 10cm~20cm, this ensures the connection strength between the top glue layer and the base paper, and is also conducive to the rapid dissolution and peeling of the top glue layer during the water transfer process. That is, the dissolution and peeling speed of some traditional water transfer papers is increased by 10%~20%, and it also ensures that the coating is uniform. The top glue layer is conducive to printing a thin, soft and bright pattern layer, and avoids the problem of cracking of the top glue layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flow chart of a water transfer paper for a glossy filmless label according to an embodiment of the present invention;

[0035] Figure 2 This is a physical picture of the traditional bright film-free label with concave and convex marks;

[0036] Figure 3This is a physical picture of the bright film-free label transferred onto sports equipment according to Example 3 of the present invention;

[0037] Figure 4 This is a physical picture of the bright film-free label transferred onto sports equipment according to Example 2 of the present invention;

[0038] Figure 5 This is a physical picture of the bright film-free label transferred onto sports equipment in comparative example 8 of the present invention. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] The present invention provides a water transfer paper for bright filmless label, comprising a base paper and a surface glue layer, wherein the surface glue layer comprises the following components by mass: 15 to 30 parts of industrial potato starch; 0.1 to 1 part of sodium alginate solution; 0.1 to 1 part of polyvinyl alcohol solution; and 95 to 100 parts of water; wherein the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600 to 1800 MPa·s, and the paste thread length of the industrial potato starch is 10 to 20 cm.

[0043] The water transfer paper for glossy filmless label has a simple formula and a low price, which effectively reduces the production cost of the water transfer paper for glossy filmless label and is easy to operate. The addition of industrial potato starch in combination with polyvinyl alcohol solution and sodium alginate solution can ensure that a surface adhesive coating with high thermal viscosity, high paste fibers and high overall transparency is formed after high-temperature gelatinization, that is, the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600mpa·s-1800mpa·s, and the length of the paste fibers is 10cm-20cm, so that the surface of the water transfer paper is The smoothness of the glue can reach more than 5000S, ensuring that the surface glue layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, while also reducing the subtle concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring a high surface smoothness and uniform pattern layer, which well meets the requirements of soft, light and bright printing of glossy film-free water marks, and also ensures the connection strength between the surface glue layer and the base paper, and is also conducive to the rapid dissolution and peeling of the base paper of the surface glue layer during the water transfer process, and also ensures that the coating is uniform. The problem of cracking of the surface glue layer is avoided.

[0044] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments.

[0045] The water transfer paper for bright filmless marking of one embodiment comprises a base paper and a surface glue layer, wherein the surface glue layer comprises the following components by mass: 15 to 30 parts of industrial potato starch; 0.1 to 1 part of sodium alginate solution; 0.1 to 1 part of polyvinyl alcohol solution; and 95 to 100 parts of water; wherein the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600 to 1800 MPa·s, and the paste length of the industrial potato starch is 10 to 20 cm.

[0046] It is understandable that some traditional water transfer papers are mixed with potato starch, corn starch, wheat starch, and sorghum starch. In actual applications, the poor thermal viscosity of corn starch, wheat starch, and sorghum starch is mainly because the starch particles of corn starch, wheat starch, and sorghum starch do not fully absorb water to expand or rupture, resulting in poor overall thermal viscosity, and are generally accompanied by white spots, which affects the overall transparency of the surface glue layer, causing problems with the connection strength, film forming properties, and overall transparency of the surface glue layer.

[0047] Therefore, in the present disclosure, industrial potato starch is used, that is, a single type of starch is used, and the addition of other different types of starch is reduced to ensure that the content of amylopectin in the added industrial potato starch is high, so that the binding force between amylopectin molecules is strong, so as to form a more compact gel network structure during high-temperature gelatinization, and at the same time, a small amount of polyvinyl alcohol solution is used to ensure that a surface glue coating with high thermal viscosity, high paste and high overall transparency is formed after high-temperature gelatinization, that is, the thermal viscosity of industrial potato starch after high-temperature gelatinization is 1600mpa·s~1800mpa·s, and the length of the paste is 10cm~20cm, so as to ensure the connection strength and film-forming property of the surface glue layer and the base paper. In addition, the overall high transparency is conducive to improving the restoration degree of the bright film-free pattern layer, so as to ensure the formation of a thin, soft and bright pattern layer, effectively eliminating the problem that the traditional surface glue layer has poor overall thermal viscosity due to the addition of corn starch, wheat starch and sorghum starch, which affects the connection strength, film-forming property and overall transparency of the surface glue layer.

[0048] It should be noted that, as in the Chinese literature mentioned in the background technology, the addition of titanium dioxide causes the coating composition to have a poor transparency, which affects the restoration degree of the pattern layer and cannot achieve the effect of being integrated with the sports equipment. Therefore, the present disclosure uses a top coat with a high overall transparency, which is conducive to printing and forming a thin, soft and bright pattern layer, and well achieves the effect of the pattern being integrated with the sports equipment.

[0049] It should also be noted that if the smoothness of the surface glue of the water transfer paper is low, such as Figure 2 As shown, it will cause fine concave and convex marks on the surface of the pattern layer, which not only causes a large amount of printing ink consumption, but also is not conducive to the surface glue being closely attached to the surface of the target object, and is not conducive to forming a light, soft and bright pattern effect on the surface of the target object. Therefore, in the present disclosure, due to the high-temperature gelatinization to form a surface glue coating with high thermal viscosity, high paste fibers and high overall transparency, while effectively reducing the amount of sodium alginate solution used, it also improves the leveling and fluidity of the surface glue coating, thereby ensuring that the surface glue coating can quickly level on the base paper, effectively improving the smoothness and uniformity of the surface glue of the water transfer paper, so that the smoothness of the surface glue of the water transfer paper can reach more than 5000S, ensuring that the surface glue layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, and at the same time reducing the fine concave and convex marks on the pattern and the surface of the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, thin and bright printing of bright filmless water labels, please refer to Figure 3 and Figure 4 shown.

[0050] Furthermore, since the formula disclosed in the present invention is simple in type and low in price, and there is no need to modify starch, the production cost of water transfer paper for bright film-free labels is effectively reduced, and the operation is simple.

[0051] It should also be noted that if the thermal viscosity of the industrial potato starch after high-temperature gelatinization does not reach 1600 MPa·s, it will affect the connection strength between the surface glue coating and the base paper; if the thermal viscosity of the industrial potato starch after high-temperature gelatinization is as high as 1800 MPa·s, it is not conducive to the rapid dissolution and peeling of the base paper in the subsequent water transfer process. Therefore, in the present disclosure, by controlling the thermal viscosity of the industrial potato starch after high-temperature gelatinization to 1600 MPa·s to 1800 MPa·s, while ensuring the connection strength between the surface glue layer and the base paper, it is also conducive to the rapid dissolution and peeling of the surface glue layer during the water transfer process.

[0052] It should also be noted that since the length of the industrial potato starch paste after high-temperature gelatinization is 10cm to 20cm, ensuring the length of the industrial potato starch paste is more appropriate, effectively avoiding the paste being too long, which leads to the inability to obtain a uniform surface glue layer in the subsequent coating, and also avoiding the problem of the surface glue layer being too short, which affects the adhesion and toughness of the surface glue layer and causes the surface glue layer to crack. In particular, with the use of the thermal viscosity of the industrial potato starch after high-temperature gelatinization of 1600mpa·s to 1800mpa·s, while ensuring the connection strength between the surface glue layer and the base paper, it is also conducive to the rapid dissolution and peeling of the surface glue layer from the base paper during the water transfer process, that is, the dissolution and peeling speed of some traditional water transfer papers is increased by 10% to 20%, and it also ensures that the coating is uniform, which is conducive to printing a thin, soft and bright pattern layer, and also avoids the problem of the surface glue layer being prone to cracking.

[0053] In this embodiment, the base paper is a wood pulp fiber base paper. It can be understood that, because wood pulp fiber has natural softness and good toughness, the base paper is not easily damaged during printing, cutting and pasting, and can maintain the integrity and clarity of the pattern; and the wood pulp fiber base paper has good water absorption, which helps to better absorb and peel off the surface glue layer during the water transfer process to ensure the complete transfer and fit of the pattern.

[0054] In a preferred embodiment, the surface glue layer includes the following mass components: 20 to 25 parts of industrial potato starch; 0.2 to 0.5 parts of sodium alginate solution; 0.3 to 0.5 parts of polyvinyl alcohol solution; 100 parts of water, so as to ensure that a small amount of sodium alginate solution and a small amount of polyvinyl alcohol solution can ensure that a relatively high amount of industrial potato starch can form a thermal viscosity of 1600 mPa·s to 1800 mPa·s after high-temperature gelatinization, and the length of the paste thread of the industrial potato starch is 10 cm to 20 cm, so as to better ensure that a surface glue coating with high thermal viscosity, high paste thread and high overall transparency is formed after high-temperature gelatinization.

[0055] In one embodiment, the granularity of the industrial potato starch is 30 μm to 40 μm, and the fineness is 100 μm to 180 μm, so as to ensure that the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600 mpa·s to 1800 mpa·s, and the length of the paste is 10 cm to 20 cm.

[0056] In one embodiment, the industrial potato starch is in the form of white powder to ensure that a transparent and high-color surface coating is finally obtained.

[0057] See also Figure 1 The present disclosure also provides a method for preparing water transfer paper for glossy filmless labels, the method comprising the following steps: mixing industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water to obtain starch emulsion; gelatinizing the starch emulsion at high temperature to obtain a surface adhesive coating; wherein the thermal viscosity of the industrial potato starch after high temperature gelatinization is 1600mpa·s to 1800mpa·s, and the paste length of the industrial potato starch is 10cm to 20cm; applying the surface adhesive coating on a base paper to obtain the water transfer paper for glossy filmless labels as described in any of the above embodiments.

[0058] The preparation method of the water transfer paper for the glossy filmless mark not only has fewer formula types, making the preparation operation simple and the price low, but also ensures that the surface glue coating after high-temperature gelatinization has high thermal viscosity, high paste silk and high overall transparent color, and the smoothness of the surface glue reaches more than 5000S, ensuring that the surface glue layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, and at the same time reducing the fine concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, light and bright printing of glossy filmless water marks, and also ensures the connection strength between the surface glue layer and the base paper, and is also conducive to the rapid dissolution and peeling of the base paper of the surface glue layer during the water transfer process, and also ensures that the coating is uniform. The problem of cracking of the surface glue layer is avoided.

[0059] In one embodiment, a method for preparing water transfer paper for glossy filmless labeling includes some or all of the following steps:

[0060] S101, mixing industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water to obtain starch milk.

[0061] It can be understood that the usage amounts of industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water are prepared according to the recipe of the gelatin layer for standby use, and then the weighed industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water are mixed so that the industrial potato starch is evenly distributed in the water to obtain starch milk.

[0062] S102, gelatinizing the starch emulsion at high temperature to obtain a surface glue coating; wherein the thermal viscosity of the industrial potato starch after high temperature gelatinization is 1600mpa·s to 1800mpa·s, and the length of the paste thread of the industrial potato starch is 10cm to 20cm.

[0063] It can be understood that if the thermal viscosity after high-temperature gelatinization is higher than 1800mpa·s, it will be unfavorable for the rapid dissolution and peeling of the base paper of the surface glue layer in the subsequent water transfer process; if the thermal viscosity after high-temperature gelatinization is lower than 1600mpa·s, it will affect the connection strength between the surface glue coating and the base paper; if the length of the paste thread is greater than 20cm, it will lead to the inability to obtain a uniform surface glue layer in the subsequent coating; if the length of the paste thread is less than 10cm, the surface glue layer will be affected due to its weak adhesion and toughness, resulting in the problem of cracking of the surface glue layer.

[0064] Therefore, in the present disclosure, by controlling the thermal viscosity of industrial potato starch after high-temperature gelatinization to 1600mpa·s~1800mpa·s and the length of the paste thread of the industrial potato starch to 10cm~20cm, it is ensured that the surface glue coating after high-temperature gelatinization has high thermal viscosity, high paste thread and high overall transparency, while also improving the smoothness of the surface glue of the water transfer paper, so that the smoothness of the surface glue of the water transfer paper can reach more than 5000S, so as to better meet the requirements of softness, lightness and brightness of the glossy filmless water mark, and also ensure the connection strength between the surface glue layer and the base paper, and also facilitate the rapid dissolution and peeling of the base paper of the surface glue layer during the water transfer process, and also ensure that the coating is uniform. The problem of cracking of the surface glue layer is avoided.

[0065] S103, coating the surface adhesive coating on the base paper to form a uniform surface adhesive coating on the base paper. In one embodiment, the surface adhesive coating is uniformly coated on one side of the base paper by a coating machine. Specifically, the coating operation is performed at a coating amount of 3 g / ㎡ to ensure that a uniform surface adhesive layer with good consistency and high smoothness is obtained.

[0066] S104, drying the coated base paper so that the surface adhesive coating forms a thin surface adhesive layer under dry conditions, thereby obtaining the water transfer paper for bright film-free labeling described in any of the above embodiments.

[0067] In one embodiment, the drying temperature is 100° C. to 120° C., and the drying time is 5S to 8S.

[0068] In one of the embodiments, the thickness of the surface glue layer is 3 μm to 4 μm, so as to ensure that the thickness of the surface glue layer is relatively thin, effectively improving the smoothness and uniformity of the surface glue layer, ensuring that the surface glue layer has no tiny concave and convex marks of pits and dots, that is, having a smooth "glass mirror surface", ensuring less consumption of printing ink, and ensuring that the printing forms a light, soft and bright pattern effect, and at the same time, it is also conducive to the rapid dissolution and peeling of the surface glue layer from the base paper.

[0069] In one embodiment, the high-temperature gelatinization includes the following specific steps: stirring and heating the starch milk at a low speed, and controlling the pre-gelatinization time of the starch milk to be 28min-30min, and the pre-gelatinization temperature to be 60°C-68°C; obtaining pre-gelatinized starch, accelerating the entry of water molecules into the interior of the industrial potato starch particles, causing the industrial potato starch particles to absorb water and swell, which is beneficial to promoting the high-temperature gelatinization process; stirring and heating the pre-gelatinized starch at a slow speed, and controlling the high-temperature time of the pre-gelatinized starch to be 2min-8min, and the high-temperature gelatinization temperature to be 80°C-85°C, so as to ensure that the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600mpa·s-1800mpa·s, and the length of the paste thread of the industrial potato starch is 10cm-20cm, thereby ensuring that the surface glue coating has a high thermal viscosity, a high paste thread and a high overall transparent color, while also ensuring that the smoothness of the surface glue reaches more than 5000S.

[0070] In one embodiment, the low-speed stirring speed is 15 rpm to 30 rpm, especially when used in conjunction with the slow stirring speed of no more than 10 rpm, to ensure that the industrial potato starch particles have a lower shear force, and to ensure that the industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water are mixed evenly, to ensure that the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600 mpa·s to 1800 mpa·s, and the length of the paste of the industrial potato starch is 10 cm to 20 cm.

[0071] In one embodiment, in the step of mixing industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water, the order of adding the materials is: the water>the polyvinyl alcohol solution>the sodium alginate solution>the industrial potato starch.

[0072] It can be understood that since the amount of sodium alginate solution and polyvinyl alcohol solution is small and soluble in water. If added after industrial potato starch, it cannot be guaranteed that adding a small amount of sodium alginate solution and a small amount of polyvinyl alcohol solution can meet the smoothness and viscosity of industrial potato starch with a higher content. Therefore, in the present disclosure, by setting the order of adding materials to the water> the polyvinyl alcohol solution> the sodium alginate solution> the industrial potato starch, the polyvinyl alcohol solution and the sodium alginate solution can be quickly and completely fully and evenly dissolved in the water, thereby ensuring that adding a small amount of sodium alginate solution and a small amount of polyvinyl alcohol solution can meet the smoothness and viscosity of industrial potato starch with a higher content.

[0073] Specifically, in one embodiment, water is first added to the reactor, and then the stirring device inside the reactor is turned on, and the speed of the stirring device is set to 25 rpm to 30 rpm; then the polyvinyl alcohol solution is added to the reactor and stirred for 3 min to 5 min to fully dissolve the polyvinyl alcohol solution in water; then, the sodium alginate solution is added to the reactor and stirred for 5 min to 10 min to fully dissolve it in water; then industrial potato starch is slowly added to the reactor and stirred evenly; then the speed of the stirring device is lowered to 20 rpm to 25 rpm, and the heating device of the reactor is turned on, wherein a multi- The temperature is raised by a moderate heat delivery method of steam transported by pipeline, and the pregelatinization time is 28 minutes to 30 minutes. When the pregelatinization temperature reaches 60°C to 68°C, the industrial potato starch particles begin to break. At this time, the stirring speed is reduced to 10 rpm. When the gelatinization temperature reaches 80°C to 85°C, the heating component and the stirring device are turned off, and then the mixture is allowed to stand for 2 minutes to 8 minutes to complete the high-temperature gelatinization operation of the industrial potato starch, so as to ensure that the thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600mpa·s to 1800mpa·s, and the length of the paste thread of the industrial potato starch is 10 cm to 20 cm.

[0074] It can be understood that the medium heat delivery method of transporting steam through multiple pipelines is used to increase the temperature so as to achieve uniform heating of the industrial potato starch, effectively avoid local overheating or overcooling of the industrial potato starch and affect the transparency after gelatinization, so as to ensure the uniformity of high-temperature gelatinization.

[0075] It can also be understood that when the industrial potato starch granules begin to break, lowering the stirring speed to 10 rpm will help maintain the intact shape of the industrial potato starch granules and avoid excessive refinement or breakage of the industrial potato starch granules, which will affect the connection strength between the top glue layer and the base paper. At the same time, the lower stirring speed can ensure that the industrial potato starch granules maintain good fluidity, avoid subsequent agglomeration and affect the length of the paste to affect the coating effect, that is, it is impossible to apply a uniform and smooth top glue layer.

[0076] It can also be understood that when the gelatinization temperature reaches 80°C to 85°C, the heating component and the stirring device are turned off, and then the mixture is allowed to stand for 2 to 8 minutes. This will help stabilize and uniformize the pregelatinized starch, thereby ensuring a surface coating with higher thermal viscosity, higher paste fibers, higher overall transparency, and a smoothness of more than 5000S.

[0077] In one embodiment, the gelatinization equipment is used to gelatinize the industrial potato starch at high temperature. Specifically, the gelatinization equipment includes a reactor, a heating component and a stirring device; the stirring member of the stirring device is arranged in the reactor, and the reactor is respectively connected to the multiple steam pipes of the heating component to ensure the uniformity of heating the industrial potato starch; the stirring member includes a plurality of blades, and each blade is staggered along the axial direction of the stirring member to ensure that the stirring member has blades of different angles from top to bottom, especially in conjunction with the use of multiple steam pipes, to ensure the stability and consistency of the gelatinization process of the industrial potato starch, effectively avoid the problem of incomplete gelatinization of the industrial potato starch, thereby ensuring that a surface adhesive coating with high thermal viscosity, high paste silk and high overall transparent color is obtained.

[0078] The present disclosure also provides a glossy filmless mark, comprising a pattern layer and water transfer paper for the glossy filmless mark, wherein the pattern layer is arranged on a surface adhesive layer of the water transfer paper for the glossy filmless mark, and the water transfer paper for the glossy filmless mark is prepared by the preparation method of the water transfer paper for the glossy filmless mark described in any of the above embodiments.

[0079] It can be understood that since the surface adhesive coating disclosed in the present invention has the characteristics of high thermal viscosity, high paste silk and high overall transparent color, the surface adhesive layer finally prepared can ensure that the smoothness of the surface adhesive layer reaches more than 5000S under the condition of meeting a relatively fast dissolution and peeling speed, and ensure that the surface adhesive layer has a smooth "glass mirror surface", thereby ensuring that the consumption of printing ink is small, and at the same time, it also reduces the fine concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, light, and bright printing of glossy filmless water marks, and also ensures the connection strength between the surface adhesive layer and the base paper, and also ensures that a uniform surface adhesive layer is obtained by coating, and also avoids the problem of easy cracking of the surface adhesive layer, so as to better meet the requirements of soft, light, and bright glossy filmless water marks.

[0080] When in use, put the back of the glossy film-free label into water, wait until the surface glue layer and the wood pulp fiber backing paper are completely peeled off, and then stick the separated pattern layer to the surface of the target object, so that the pattern adhered to the surface glue layer can be transferred to the surface of the target object along with the surface glue layer, thereby realizing the transfer of the pattern.

[0081] In one embodiment, the glossy film-free label further includes a primer layer, which is disposed between the top glue layer and the pattern layer. The added primer layer can provide good adhesion for the ink, ensuring that the ink can be firmly attached to the top glue layer, thereby preventing the ink from falling off or penetrating during use, thereby improving the overall stability and durability of the glossy film-free label.

[0082] In one embodiment, the glossy film-free label further includes a glossy ink layer to enhance the glossiness of the pattern layer, thereby ensuring that a soft, thin and glossy pattern layer is prepared.

[0083] In one embodiment, since the surface adhesive layer of the glossy filmless label is thin, the smoothness is as high as 5000S or more, and the uniformity is high, the surface adhesive layer is ensured to have a smooth "glass mirror", thereby ensuring less consumption of printing ink, and at the same time reducing the fine concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, light, and bright printing of the glossy filmless water label, that is, ensuring that the thin surface adhesive layer obtained by dissolution can fit tightly with the sports equipment without showing concave and convex marks, and realizing a seamless integration with the sports equipment, effectively avoiding the surface adhesive layer from adhering to the base paper and affecting the tightness and concave and convex marks attached to the target object, and also facilitating the surface adhesive layer to be quickly dissolved and peeled off from the base paper in water, thereby improving the transfer efficiency. It is particularly suitable for the application of some sports equipment with high curved surfaces.

[0084] Compared with the prior art, the present invention has at least the following advantages:

[0085] 1) Due to the high content of amylopectin in industrial potato starch, the binding force between amylopectin molecules is strong, so that a tighter gel network structure is formed during high-temperature gelatinization. At the same time, a small amount of polyvinyl alcohol solution is used to ensure that a surface glue coating with high thermal viscosity, high paste fibers and high overall transparency is formed after high-temperature gelatinization. That is, the thermal viscosity of industrial potato starch after high-temperature gelatinization is 1600mpa·s~1800mpa·s, and the length of the paste fibers is 10cm~20cm, thereby ensuring the connection strength and film-forming property of the surface glue layer and the base paper, and the overall high transparency is conducive to improving the restoration degree of the bright film-free pattern layer, so as to ensure the formation of a light, soft and bright pattern layer, effectively eliminating the problem that the traditional surface glue layer has poor overall thermal viscosity due to the addition of corn starch, wheat starch and sorghum starch, which affects the connection strength, film-forming property and overall transparency of the surface glue layer.

[0086] 2) Due to the high-temperature gelatinization, a surface adhesive coating with high thermal viscosity, high paste silk and high overall transparent color is formed. While effectively reducing the use of sodium alginate solution, it also improves the leveling and fluidity of the surface adhesive coating, thereby ensuring that the surface adhesive coating can quickly level on the base paper, effectively improving the smoothness and uniformity of the surface adhesive of the water transfer paper, so that the smoothness of the surface adhesive of the water transfer paper can reach more than 5000S, ensuring that the surface adhesive layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, and at the same time reducing the subtle concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring that a pattern layer with high surface smoothness and uniformity is obtained, which well meets the requirements of soft, thin and bright printing of glossy film-free water marks.

[0087] 3) Since the formula disclosed in the present invention is simple in type and low in price, the production cost of water transfer paper for bright film-free labels is effectively reduced, and the operation is simple.

[0088] 4) The traditional method of improving the reproducibility of the pattern layer by adding titanium dioxide, that is, the transparency of the traditional coating composition is poor, which affects the reproducibility of the pattern layer and cannot achieve the effect of being integrated with the sports equipment. However, the present invention adopts a top coat layer with high overall transparency, which is conducive to printing and forming a thin, soft and bright pattern layer, and well achieves the effect of the pattern being integrated with the sports equipment.

[0089] 5) Since the thermal viscosity of industrial potato starch after high-temperature gelatinization is 1600mpa·s~1800mpa·s and the length of the paste thread is 10cm~20cm, this ensures the connection strength between the top glue layer and the base paper, and is also conducive to the rapid dissolution and peeling of the base paper during the water transfer process. It also ensures that the coating is uniform, which is conducive to printing a thin, soft and bright pattern layer, and avoids the problem of cracking of the top glue layer.

[0090] Some specific examples are given below, and if % is mentioned, it means percentage by weight. It should be noted that the following examples do not exhaust all possible situations, and the materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0091] It should be noted that industrial potato starch is provided by Dezhou Runde Starch Co., Ltd., with a model of 25KG / bag; sodium alginate solution is provided by Qingdao Yifang Chemical Co., Ltd., with a specification of 10KG / bag; polyvinyl alcohol solution is provided by Henan Wanshan New Materials Co., Ltd., with a specification of 25KG / bag; wood pulp fiber base paper is provided by Shandong Henglian Paper, with a specification of 175G water transfer base paper.

[0092] Table 1 Recipe

[0093]

[0094] The formulations of Examples 1 to 3 and Comparative Examples 1 to 4 in Table 1 were prepared according to the following steps:

[0095] First, add water into the reactor, then turn on the stirring device inside the reactor, and set the stirring device speed to 30 rpm; then put the polyvinyl alcohol solution into the reactor and stir for 5 minutes to make the polyvinyl alcohol solution fully dissolved in water; then, put the sodium alginate solution into the reactor and stir for 5 minutes to make the sodium alginate solution fully dissolved in water; then slowly put the industrial potato starch into the reactor and stir evenly; then, lower the stirring device speed to 20 rpm, and turn on the heating device of the reactor, wherein a moderate heat delivery method of multi-pipeline steam is used for heating, the pregelatinization time is 30 minutes, when the pregelatinization temperature reaches 60°C, the industrial potato starch particles begin to break, at this time, the stirring speed is lowered to 10 rpm, and when the gelatinization temperature reaches 85°C, the heating component and the stirring device are turned off, and then it is allowed to stand for 5 minutes to complete the high-temperature gelatinization operation of the industrial potato starch, and the surface glue coating can be obtained.

[0096] Then, at 3g / m 2 The surface glue coating is evenly coated on one surface of the wood pulp fiber base paper with a coating amount of, and finally the coated wood pulp fiber base paper is placed at 110°C for drying for 5S to obtain a water transfer paper for bright film-free labels.

[0097] Comparative Example 5

[0098] The difference from Example 3 is that the order of adding materials in Comparative Example 5 is different, that is, the order of adding materials in Comparative Example 5 is water>industrial potato starch>sodium alginate solution>polyvinyl alcohol solution, and the rest remains unchanged.

[0099] Comparative Example 6

[0100] The difference from Example 3 is that the industrial potato starch in Example 3 is replaced by corn starch, and the rest remains unchanged.

[0101] Comparative Example 7

[0102] The difference from Example 3 is that the industrial potato starch in Example 3 is replaced by wheat starch, and the rest remains unchanged.

[0103] Comparative Example 8

[0104] The difference from Example 3 is that the industrial potato starch in Example 3 is replaced by a mixture of wheat starch and industrial potato starch, and the total amount of the mixture remains unchanged.

[0105] The water transfer papers for the glossy filmless labels of Examples 1 to 3 and Comparative Examples 1 to 8 prepared above were subjected to primer printing, pattern printing, and glossy ink printing to obtain corresponding glossy filmless labels.

[0106] The glossy film-free labels of Examples 1 to 3 and Comparative Examples 1 to 8 prepared above were tested for various properties listed in Table 2, and were water-transfer printed on the surface of sports equipment to obtain the experimental data listed in Table 2 below.

[0107] Among them, the detection method of hot viscosity after high-temperature gelatinization is: using a rotary viscosity tester for detection.

[0108] The method for detecting the length of the paste after high-temperature gelatinization is to use the upper and lower suspended wire drawing method for measurement.

[0109] Method for detecting the transparent color of surface coating: visual inspection.

[0110] Method for testing the smoothness of the surface rubber layer: use a smoothness tester for testing.

[0111] Testing method for the connection strength between the top glue layer and the base paper: 100-grid test method.

[0112] Method for testing the apparent performance of the printed pattern layer: visual inspection.

[0113] Method for detecting the dissolution and peeling time of the surface glue layer during water transfer printing: Use a stopwatch counter to record the time when the surface glue layer and the wood pulp fiber base paper are completely peeled off.

[0114] Table 2

[0115]

[0116]

[0117]

[0118]

[0119] From the comparison between Example 3 and Comparative Example 1 in Table 2 above, it can be seen that since Comparative Example 1 does not use sodium alginate solution, the comprehensive index of Comparative Example 1 is worse than that of Example 3.

[0120] From the comparison between Example 3 and Comparative Example 2 in Table 2, it can be seen that since Comparative Example 2 does not use polyvinyl alcohol solution, the comprehensive index of Comparative Example 2 is worse than that of Example 3.

[0121] From the comparison between Example 3 and Comparative Examples 3 and 4 in Table 2, it can be seen that since the amount of sodium alginate solution used in Comparative Example 3 and the amount of polyvinyl alcohol solution used in Comparative Examples 3 and 4 are both greater than the amounts used in Example 3, the comprehensive indicators of Comparative Examples 3 and 4 are worse than those of Example 3.

[0122] From the comparison between Example 3 and Comparative Example 5 in Table 2, it can be seen that since the sodium alginate solution and the polyvinyl alcohol solution in Comparative Example 5 are added after the industrial potato starch, the comprehensive index of Comparative Example 5 is worse than that of Example 3.

[0123] From the comparison between Example 3 and Comparative Examples 6-8 in Table 2, it can be seen that since Comparative Examples 6-8 use corn starch, wheat starch or a mixture of wheat starch and industrial potato starch, the comprehensive indicators of Comparative Examples 6-8 are worse than those of Example 3.

[0124] In summary, when a high content of industrial potato starch is used in combination with a small amount of sodium alginate solution, a small amount of polyvinyl alcohol solution and a large amount of water, the order of adding materials and the high temperature gelatinization conditions are controlled to ensure that a small amount of sodium alginate solution and a small amount of polyvinyl alcohol solution can play a synergistic role. In this way, while ensuring that the preparation is high in hot viscosity, high in paste thread and high in overall transparency, that is, the hot viscosity after high temperature gelatinization is 1600mpa·s-1800mpa·s, the paste thread length is 10cm-20cm, and the The smoothness of the surface glue reaches more than 5000S, ensuring that the surface glue layer has a smooth "glass mirror", thereby ensuring less consumption of printing ink, while also reducing the subtle concave and convex marks on the surface of the pattern and the target object after water transfer, ensuring a high surface smoothness and uniform pattern layer, which well meets the requirements of softness, lightness and brightness of the glossy filmless water mark, and also ensures the connection strength between the surface glue layer and the base paper, which is also conducive to the rapid dissolution and peeling of the surface glue layer during the water transfer process, and also ensures that the coating is uniform. The surface glue layer also avoids the problem of cracking. Please combine Figures 3 to 5 As shown, the comprehensive index of Example 3 is the best.

[0125] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A water transfer paper for glossy filmless label, comprising a base paper and a surface adhesive layer, characterized in that: The surface glue layer includes the following mass components: The thermal viscosity of the industrial potato starch after high-temperature gelatinization is 1600 mpa·s to 1800 mpa·s, and the length of the paste thread of the industrial potato starch is 10 cm to 20 cm.

2. The water transfer paper for bright filmless labeling according to claim 1, characterized in that: The surface glue layer includes the following mass components:

3. The water transfer paper for bright filmless labeling according to claim 1, characterized in that: The granularity of the industrial potato starch is 30 μm to 40 μm, and the fineness is 100 μm to 180 μm.

4. The water transfer paper for bright filmless labeling according to claim 1, characterized in that: The thickness of the surface glue layer is 3 μm to 4 μm.

5. A method for preparing water transfer paper for bright film-free label, characterized in that: The method for preparing the water transfer paper for the bright film-free label comprises the following steps: Industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water are mixed to obtain starch milk; The starch emulsion is subjected to high temperature gelatinization to obtain a surface glue coating; wherein the thermal viscosity of the industrial potato starch after high temperature gelatinization is 1600mpa·s to 1800mpa·s, and the length of the paste thread of the industrial potato starch is 10cm to 20cm; Applying the surface glue coating on the base paper; The coated base paper is dried to obtain the water transfer paper for bright film-free labeling as claimed in claims 1 to 4.

6. The method for preparing the water transfer paper for bright filmless label according to claim 5, characterized in that: The high temperature gelatinization comprises the following specific steps: The starch milk is stirred at a low speed and heated, and the pregelatinization time of the starch milk is controlled to be 28 minutes to 30 minutes, and the pregelatinization temperature is controlled to be 60° C. to 68° C. to obtain pregelatinized starch; The pregelatinized starch is subjected to a slow stirring and heating operation, and the high temperature time of the pregelatinized starch is controlled to be 2 minutes to 8 minutes, and the high temperature gelatinization temperature is controlled to be 80° C. to 85° C., to obtain the surface glue coating.

7. The method for preparing the water transfer paper for bright filmless label according to claim 6, characterized in that: The speed of the low-speed stirring is 15 rpm to 30 rpm.

8. The method for preparing the water transfer paper for bright filmless label according to claim 6, characterized in that: The speed of the slow stirring is no more than 10 rpm.

9. The method for preparing the water transfer paper for bright filmless label according to claim 5, characterized in that: In the step of mixing industrial potato starch, sodium alginate solution, polyvinyl alcohol solution and water, the order of adding the materials is: the water>the polyvinyl alcohol solution>the sodium alginate solution>the industrial potato starch.

10. A glossy filmless label, comprising a pattern layer and water transfer paper for a glossy filmless label, characterized in that: The pattern layer is arranged on the surface adhesive layer of the water transfer paper for the glossy filmless mark, and the water transfer paper for the glossy filmless mark is prepared by the preparation method of the water transfer paper for the glossy filmless mark according to any one of claims 5 to 9.

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