Drying method and coated cloth for watercolor paper-like canvas

Abstract

The present invention provides a method for drying a watercolor paper-like canvas and a coated cloth, comprising: a first step, obtaining a fabric substrate with a base coating applied on the surface; a second step, allowing the coating of the base coating to partially enter the gaps of the fabric substrate under the action of hot air; a third step, spraying gelatin and cooling to form a gelatin transition layer; a fourth step, applying a coating to the outside of the gelatin transition layer to form a top coating; a fifth step, heating the fabric substrate again to melt the gelatin transition layer; and a sixth step, cooling and drying to form a coated cloth product. The method for drying a watercolor paper-like coated cloth provided by the present invention uses high-temperature and medium-temperature hot air to act on the base coating successively, so that the base coating penetrates into the gaps of the fabric substrate under the pressure of the hot air, thereby effectively improving the bonding force between the slurry and the fabric substrate; therefore, the base coating forms pits due to the action of the high-pressure hot air, which are filled with gelatin, and the gelatin is quickly cooled, thereby ensuring the normal scraping process of the top coating and maintaining the smoothness of the surface of the top coating.

Description

Technical Field

[0001] The invention relates to the technical field of canvases, in particular to a drying method for a watercolor paper-like canvas and a coated cloth. Background Art

[0002] Watercolor paper is thicker and has stronger fibers. It is not easy to break or pill due to repeated painting, so the water absorption of watercolor paper is higher than that of ordinary paper. This allows the pigment to penetrate and diffuse better, forming a rich color effect. However, because the fibers of watercolor paper are generally coarser, it is generally not easy to create paintings with delicate lines when painting on watercolor paper.

[0003] Conventional canvas is mainly used for oil painting, and conventional canvas does not have the water absorption characteristics of watercolor paper, so oil painting canvas cannot be used for watercolor painting. At the same time, due to the structural characteristics of oil painting canvas, the thickness of the canvas is also thinner, and it is not easy to produce the good water absorption like watercolor paper.

[0004] The applicant has developed a canvas with the water absorption, color reproduction and durability of watercolor paper. The solution uses gelatin to enhance the smoothness of the canvas, but the low melting point of gelatin also makes it impossible to directly scrape the topcoat on the outside of the gelatin; at the same time, the canvas also faces the problem of how to dry the coating to ensure the smoothness of the coating and maintain the bonding strength between the coating and the fabric substrate after the coating is thickened. Summary of the invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a drying method for a watercolor paper-like canvas and a coated cloth, so as to solve the problem of maintaining the bonding force between the canvas coating and the fabric substrate after the canvas coating is thickened and ensuring the smoothness of the canvas surface.

[0006] In order to solve the above technical problems, the present invention provides a method for drying a watercolor paper-like canvas, comprising: The first step is to obtain a fabric substrate with a base coating applied on the surface; The second step is to partially allow the paint of the base coat to enter the gaps of the fabric substrate under the action of hot air; Step 3: spray gelatin and cool to form a gelatin transition layer; Step 4: Scrape the coating on the outside of the gelatin transition layer to form a topcoat; Step 5: Heat the fabric substrate again to melt the gelatin transition layer; Step 6: Cooling and drying to form a coated cloth product.

[0007] The fabric base material is a polyester plain woven fabric, the thickness of the fabric base material is between 0.4 and 0.6 mm, and the fabric density of the fabric base material is 300 to 500 polyester threads per 10 cm.

[0008] In the second step, the fabric substrate coated with the primer layer is moved to a first drying atmosphere, in which a hot air flow is blown toward the primer layer, so that the paint of the primer layer enters into the gaps of the fabric substrate under pressure.

[0009] In the first drying atmosphere, hot air at 90-95°C is blown at a low speed toward the base coating layer to quickly harden the surface of the base coating layer; hot air at 60°C is then blown at a high speed toward the base coating layer to squeeze the base coating layer downward into the gaps in the fabric substrate and form pits on the surface of the base coating layer.

[0010] The low speed in the second step refers to a speed that will not cause the paint of the base coat and the top coat to flow, for example, not exceeding 10 cm / s; the high speed in the second step refers to a speed that can form airflow pressure on the surface of the base coat and transmit the pressure downward through the hardened surface, for example, exceeding 100 cm / s.

[0011] The thickness of the base coat is greater than the thickness of the top coat.

[0012] The thickness of the primer layer is 0.2-0.4 mm, and the thickness of the top layer is 0.05-0.2 mm.

[0013] The coating materials of the base coating layer and the top coating layer are coating materials of the same composition, and the main components of the coating materials are oxidized starch and bacterial cellulose.

[0014] The preparation process of the coating comprises: The oxidized starch is mixed with water to obtain an oxidized starch solution, and the oxidized starch solution is gelatinized; The bacterial cellulose is mixed with water to prepare a bacterial cellulose dispersion; The gelatinized oxidized starch and bacterial cellulose dispersion are mixed in a ratio of 3:7 and stirred evenly to form a coating. The mass ratio of the oxidized starch and the bacterial cellulose in the coating is (3-5):1, and the weight percentage of the oxidized starch and the bacterial cellulose in the coating is 10-12%.

[0015] The coating also includes a thickener, an antiseptic, a leveling agent, a dispersant and a defoamer, and the weight ratio of each auxiliary agent is 0.5wt% of the thickener, 0.02wt% of the antiseptic, 0.2wt% of the leveling agent, 0.15wt% of the dispersant and 0.15wt% of the defoamer.

[0016] The length of the bacterial cellulose is 50-200 μm, and the spraying thickness of the gelatin does not exceed the maximum length of the bacterial cellulose.

[0017] In the third step, the fabric substrate is moved into the spraying atmosphere, the gelatin is heated in the spraying atmosphere to melt it and present liquid properties, the atomized gelatin solution is sprayed onto the surface of the base coating, and the spraying atmosphere is maintained at 50-60°C to maintain the fluidity of the gelatin so that the gelatin can flow freely into the pits of the base coating in the spraying atmosphere to fill the pits; then the fabric substrate is moved into a cooling atmosphere below 30°C to allow the gelatin solution to solidify on the surface of the base coating to form a gelatin transition layer.

[0018] In the third step, the temperature of the gelatin solution before atomization is between 70-80°C.

[0019] In the third step, the temperature of the cold air in the cooling atmosphere is -5-0°C.

[0020] The scraping method used in the first and fourth steps is a conventional scraping method.

[0021] In the fifth step, the textile substrate coated with the top coating is moved to a second drying atmosphere, and the temperature of the second drying atmosphere does not exceed 80°C.

[0022] In the fifth step, hot air at 50-60°C is blown at a low speed toward the top coating.

[0023] The sixth step of cooling is by air cooling or natural cooling.

[0024] The invention also provides a coated cloth, which is made by the drying method.

[0025] The method for drying a watercolor paper-like canvas and the coated cloth provided by the present invention use high-temperature and medium-temperature hot air to act on the base coating layer in sequence, so that the base coating layer penetrates into the gaps of the fabric substrate under the pressure of the hot air, thereby effectively improving the bonding force between the slurry and the fabric substrate; therefore, pits are formed in the base coating layer due to the action of the high-pressure hot air, which are filled with gelatin and quickly cooled, thereby ensuring the normal scraping process of the top coating layer and maintaining the surface smoothness of the top coating layer.

[0026] The drying method of the present invention ensures that the base coat is downwardly incorporated into the gaps of the fabric substrate by precisely controlling the temperature, thereby improving the bonding strength between the base coat and the fabric substrate and preventing the base coat from being moved by wind due to excessive wind force; further, the pits generated thereby are filled with atomized gelatin, and the gelatin is quickly cooled by cold air, thereby preventing the gelatin from being rolled up when the top coat is applied or from being damaged due to the gelatin not being solidified; after the top coat is applied, the top coat is dried and heated again to melt the gelatin transition layer, thereby organically combining the top coat and the base coat, ensuring the flatness of the surface of the coated cloth, and utilizing the fusion of bacterial cellulose in the base coat and the top coat with the gelatin in the middle to also improve the wettability of the coated cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the effects of each step of the drying method of watercolor paper-like coated cloth.

[0028] In the figure: 1-textile substrate, 2-base coating, 3-gelatin transition layer, 4-top coating. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0030] 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.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] Combination Figure 1 As shown, the present invention provides a method for drying a watercolor paper-like canvas, comprising: The first step is to obtain a fabric substrate 1 with a base coating 2 applied on the surface. Before this step, the coating is applied on the upper surface of the fabric substrate 1 by scraping to form a base coating 2. Figure 1 The plane structure shown in step S1; wherein the fabric substrate is a polyester plain woven fabric, the thickness of the fabric substrate is 0.5 mm, the fabric density of the fabric substrate is 300 to 500 polyester threads per 10 cm, and in this embodiment, 300 warps and 500 wefts are used. The thickness of the base coating is usually between 0.2-0.4 mm, and in this embodiment, 0.3 mm is used.

[0033] The second step is to make the paint of the base coat partially enter the gaps of the fabric substrate under the action of hot air; specifically, the fabric substrate coated with the base coat is moved to the first drying atmosphere, and the hot air flow is blown from top to bottom toward the base coat in the first drying atmosphere, so that the paint of the base coat extends downward along the gaps of the fabric substrate under the action of the air flow pressure to fill part or all of the gaps, forming a Figure 1 In the structural schematic diagram shown in S2, it can be seen from the figure that downward pits are formed on the upper surface of the primer layer 2 corresponding to the gap position (the reason is that the paint is squeezed downward, causing the surface layer of the paint to sink); since the structure is more complicated in the actual operation process, this figure is only a schematic diagram, especially since the gaps include the gaps between the warp and the weft, the gaps between the warp and the warp, the gaps between the weft and the weft, and some narrow corners that cannot be filled with paint, these areas are distributed over the entire material of the entire fabric substrate, which actually leads to the presence of downward pits in almost the entire area of ​​the primer layer.

[0034] The second step is further designed as follows: first, hot air at 90-95°C is blown at a low speed to the base coating layer, so that the surface of the base coating layer hardens quickly; then, hot air at 60°C is blown at a high speed to the base coating layer, so that the base coating layer is squeezed downward into the gaps in the fabric substrate and pits are formed on the surface of the base coating layer; this step is achieved by blowing gases at different temperatures twice, wherein the hot air at 90-95°C is blown at a low speed to the base coating layer 2, so that the base coating layer 2 will not be deformed, but its high temperature can make the water on the base coating layer evaporate quickly, thereby forming a hardened layer on the surface of the base coating layer, and then the hot air at a lower temperature (60°C) and a higher flow rate is used. The hot air is blown to the hardened surface of the base coating, which forms a pressure on the hardened surface, so that the coating below the hardened surface can penetrate downward and enter the gaps in the fabric substrate, thereby forming a three-dimensional connection between the base coating and the fabric substrate 1, thereby increasing the contact area and bonding force between the two; the low speed refers to a speed that does not cause the coating of the base coating and the top coating to flow, for example: 10 cm / s, 8 cm / s, 7 cm / s; the high speed refers to a speed that can form airflow pressure on the surface of the base coating and transmit the pressure downward through the hardened surface, for example 105 cm / s, 130 cm / s, 180 cm / s, 200 cm / s.

[0035] The third step is to spray gelatin and cool it to form a gelatin transition layer; specifically, the fabric substrate is moved into the spraying atmosphere, the gelatin is heated in the spraying atmosphere to melt it and present liquid properties, the atomized gelatin solution is sprayed onto the surface of the base coating, and the spraying atmosphere is maintained at 50-60°C to maintain the fluidity of the gelatin so that the gelatin can flow freely to the pits of the base coating in the spraying atmosphere to fill the pits; then the fabric substrate is moved into a cooling atmosphere below 30°C to allow the gelatin solution to solidify on the surface of the base coating to form a gelatin transition layer. In this step, the gelatin is first heated to a molten state so that it can meet the properties of liquid flow, so that its fluidity can be used to fill the pits on the base coating layer, and then the melted gelatin solution is atomized and sprayed on the surface of the base coating layer. After leaving the spraying atmosphere, the gelatin solution is cooled by cold air so that the gelatin solution solidifies on the surface of the base coating layer to form a gelatin transition layer; the sprayed gelatin solution forms a uniform gelatin solution coverage on the surface of the base coating layer, and due to the fluidity of the gelatin solution, the pits on the surface of the base coating layer are automatically filled, but the fluidity of the gelatin solution will cause the scraping process of the top coating layer to be unable to proceed, so the gelatin solution is quickly cooled and solidified by cold air, and then the top coating is scraped thereon to ensure that the gelatin transition layer will not be destroyed during the scraping process.

[0036] Step 4: Scrape the coating on the outside of the gelatin transition layer to form a topcoat. The scraping method in this step is the same or similar to that in the first step, and conventional scraping equipment or methods can be used. When performing this step, since the gelatin transition layer has solidified under a cooling atmosphere to form a solid surface layer, the topcoat applied on the upper part of the gelatin transition layer will not be restricted by the pits. Generally, the thickness of the topcoat should be less than that of the basecoat, for example, the topcoat can be 0.2 mm or 0.1 mm.

[0037] Step 5: Heat the fabric substrate again to melt the gelatin transition layer; move the fabric substrate with the topcoat to the second drying atmosphere, and the temperature of the second drying atmosphere does not exceed 80°C (the purpose is to avoid boiling or vaporization of gelatin due to excessive temperature). In the actual operation, in the second drying atmosphere, hot air at 60°C is blown at a low speed to the topcoat to melt the gelatin transition layer again, and to establish a connection between the bacterial cellulose between the topcoat and the basecoat. The gelatin transition layer is no longer a coating with a clear interface, but a fuzzy interface coating that is organically combined with the basecoat and the topcoat. At a temperature of 60°C, the water content of the basecoat, topcoat and gelatin transition layer evaporates, and then a dense coating is formed as a whole.

[0038] The sixth step is cooling and drying to form a coated cloth product. The cooling can be done by air cooling or natural cooling, and the drying can be done by natural drying or low temperature drying at 40-50℃.

[0039] The fabric base material is a polyester plain woven fabric, the thickness of the fabric base material is between 0.4 and 0.6 mm, and the fabric density of the fabric base material is 300 to 500 polyester threads per 10 cm.

[0040] The coating materials of the base coating layer and the top coating layer are coating materials of the same composition, and the main components of the coating materials are oxidized starch and bacterial cellulose.

[0041] The preparation process of the coating comprises: The oxidized starch is mixed with water to obtain an oxidized starch solution, and the oxidized starch solution is gelatinized; The bacterial cellulose is mixed with water to prepare a bacterial cellulose dispersion; The gelatinized oxidized starch and bacterial cellulose dispersion are mixed in a ratio of 3:7 and stirred evenly to form a coating. The mass ratio of the oxidized starch and the bacterial cellulose in the coating is (3-5):1, and the weight percentage of the oxidized starch and the bacterial cellulose in the coating is 10-12%.

[0042] The coating also includes a thickener, an antiseptic, a leveling agent, a dispersant and a defoamer, and the weight ratio of each auxiliary agent is 0.5wt% of the thickener, 0.02wt% of the antiseptic, 0.2wt% of the leveling agent, 0.15wt% of the dispersant and 0.15wt% of the defoamer.

[0043] The length of the bacterial cellulose is 50-200 μm, and the spraying thickness of the gelatin does not exceed the maximum length of the bacterial cellulose, so that the bacterial cellulose in the primer and topcoat coatings can establish a connection through the gelatin transition layer.

[0044] In the third step, the temperature of the gelatin solution before atomization is between 50-60°C, which can ensure that the gelatin has good fluidity and is convenient for atomization spraying; the surface temperature of the base coating or the drying environment in which it is located is not lower than 40°C, which can ensure that the gelatin will not solidify immediately but maintain a certain fluidity, thereby automatically filling the pits produced in the second step.

[0045] In the third step, the temperature of the cold air is -5-0°C, and the cold air is used to quickly cool and solidify the gelatin to form a gel layer covering the surface of the base coating.

[0046] The method for drying a watercolor paper-like canvas provided by the present invention uses high-temperature and medium-temperature hot air to act on the base coating layer in sequence, so that the base coating layer penetrates into the gaps of the fabric substrate under the pressure of the hot air, thereby effectively improving the bonding force between the slurry and the fabric substrate; therefore, pits are formed in the base coating layer due to the action of the high-pressure hot air, which are filled with gelatin and quickly cooled, thereby ensuring the normal progress of the scraping process of the top coating layer and maintaining the smoothness of the surface of the top coating layer.

[0047] The drying method of the present invention ensures that the base coat is downwardly incorporated into the gaps of the fabric substrate by precisely controlling the temperature, and prevents the base coat from being moved by wind due to excessive wind force; further, the pits generated thereby are filled with atomized gelatin, and the gelatin is quickly cooled by cold air, thereby avoiding the problem of the gelatin being rolled up when the top coat is applied or being damaged due to the gelatin not being solidified.

[0048] The present invention also provides a coated cloth, which is made by the drying method of the watercolor paper-like coated cloth described in the above embodiment.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for drying a watercolor paper-like canvas, characterized in that: include: The first step is to obtain a fabric substrate with a base coating applied on the surface; The second step is to partially allow the paint of the base coat to enter the gaps of the fabric substrate under the action of hot air; Step 3: spray gelatin and cool to form a gelatin transition layer; Step 4: Scrape the coating on the outside of the gelatin transition layer to form a topcoat; Step 5: Heat the fabric substrate again to melt the gelatin transition layer; Step 6: Cooling and drying to form a coated cloth product.

2. The drying method according to claim 1, characterized in that: The fabric base material is a polyester plain woven fabric, the thickness of the fabric base material is between 0.4 and 0.6 mm, and the fabric density of the fabric base material is 300 to 500 polyester threads per 10 cm.

3. The drying method according to claim 1, characterized in that: In the second step, the fabric substrate coated with the primer layer is moved to a first drying atmosphere, in which a hot air flow is blown toward the primer layer, so that the paint of the primer layer enters into the gaps of the fabric substrate under pressure.

4. The drying method according to claim 3, characterized in that: In the first drying atmosphere, hot air at 90-95°C is blown at a low speed toward the base coating layer to quickly harden the surface of the base coating layer; hot air at 60°C is then blown at a high speed toward the base coating layer to squeeze the base coating layer downward into the gaps in the fabric substrate and form pits on the surface of the base coating layer.

5. The drying method according to claim 4, characterized in that: The low speed in the second step refers to a speed that will not cause the paint of the base coat and the top coat to flow, for example, not exceeding 10 cm / s; the high speed in the second step refers to a speed that can form airflow pressure on the surface of the base coat and transmit the pressure downward through the hardened surface, for example, exceeding 100 cm / s.

6. The drying method according to claim 1, characterized in that: The thickness of the base coat is greater than the thickness of the top coat.

7. The drying method according to claim 1, characterized in that: The thickness of the primer layer is 0.2-0.4 mm, and the thickness of the top layer is 0.05-0.2 mm.

8. The drying method according to claim 1, characterized in that: The coating materials of the base coating layer and the top coating layer are coating materials of the same composition, and the main components of the coating materials are oxidized starch and bacterial cellulose.

9. The drying method according to claim 8, characterized in that: The length of the bacterial cellulose is 50-200 μm, and the spraying thickness of the gelatin does not exceed the maximum length of the bacterial cellulose.

10. The drying method according to claim 1, characterized in that: In the third step, the fabric substrate is moved into the spraying atmosphere, the gelatin is heated in the spraying atmosphere to melt it and present liquid properties, the atomized gelatin solution is sprayed onto the surface of the base coating, and the spraying atmosphere is maintained at 50-60°C to maintain the fluidity of the gelatin so that the gelatin can flow freely into the pits of the base coating in the spraying atmosphere to fill the pits; then the fabric substrate is moved into a cooling atmosphere below 30°C to allow the gelatin solution to solidify on the surface of the base coating to form a gelatin transition layer.

11. The drying method according to claim 10, characterized in that: In the third step, the temperature of the gelatin solution before atomization is between 70-80°C.

12. The drying method according to claim 10, characterized in that: In the third step, the temperature of the cold air in the cooling atmosphere is -5-0°C.

13. The drying method according to claim 1, characterized in that: The scraping method used in the first and fourth steps is a conventional scraping method.

14. The drying method according to claim 1, characterized in that: In the fifth step, the textile substrate coated with the top coating is moved to a second drying atmosphere, and the temperature of the second drying atmosphere does not exceed 80°C.

15. The drying method according to claim 14, characterized in that: In the fifth step, hot air at 50-60°C is blown at a low speed toward the top coating.

16. The drying method according to claim 1, characterized in that: The sixth step of cooling is by air cooling or natural cooling.

17. A coated cloth, characterized in that: The product is prepared by the drying method according to any one of claims 1 to 16.

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