A coating process for stone paper processing

Abstract

This invention discloses a coating process for stone paper processing, including an equipment frame with supports on both sides. A roll of base material and a roll of coating material are nested inside the supports. The base material roll and the coating material roll are wound downwards into a finished roll through a coating process. This invention provides a processing technology for stone paper coating based on an adhesive coating device. Its main application scenario is the coating and bonding method between stone paper substrate and an external adhesive decorative layer. It also improves the processing of the stone paper substrate. Through the surface processing steps of the stone paper substrate, it solves the problem of uneven processing effect caused by the grinding and wire drawing steps commonly used in existing technologies to create rough surfaces for coating methods such as bonding and fusion, and the problem of uneven finished product surface after the process, which easily leaves protrusions on the substrate surface.

Description

Technical Field

[0001] This invention relates to the field of stone paper, specifically a coating process for stone paper processing. Background Technology

[0002] Stone paper is a new type of environmentally friendly material, mainly composed of calcium carbonate (approximately 80%) and a small amount of high-density polyethylene (HDPE, approximately 20%). This material not only reduces reliance on trees and water resources during production, but also has wide applications in packaging, printing, and stationery due to its unique physical properties such as water resistance, oil resistance, and tear resistance. However, to further improve the performance of stone paper, especially its printability and durability, the coating process becomes particularly important in its production.

[0003] With technological advancements, the coating process for stone paper is constantly evolving. Currently, commonly used coating technologies include roll coating, blade coating, and spray coating, with different technologies suitable for different application needs. Furthermore, coating materials are continuously being innovated, from traditional polymer coatings to functional coatings such as nano-coatings and self-cleaning coatings, thus expanding and improving the application range and performance of stone paper.

[0004] The coating process for stone paper is often used in lamination processes to further improve its decorative properties, toughness, and other characteristics. Lamination typically involves combining two layers of stone paper using adhesive or lamination techniques to enhance the material's strength, thickness, and performance. This process allows for the manufacture of thicker, more robust stone paper products to meet specific application requirements.

[0005] Existing composite coating processes typically use grinding and wire drawing to create rough surfaces on the substrate to improve bonding and fusion. However, due to wear and tear on the abrasives and the need for molds with uniform protrusions on flat surfaces, numerous burrs protruding in one direction are generated on the outer surface after processing. This uneven distribution of protrusions causes cavities to form beneath the burrs during the coating process due to surface tension, compromising the bonding effect of the coating material. Furthermore, subsequent processing results in an uneven finished product surface. Therefore, a coating process specifically designed for stone paper processing is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a coating process for stone paper processing to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a coating process for stone paper processing, comprising an equipment frame, with supports on both sides of the equipment frame, and a roll of base material and a roll of coating material sleeved inside the supports, wherein the roll of base material and the roll of coating material are wound downwards into a finished roll through a coating process.

[0008] The equipment frame includes a main frame, on both sides of which a first bracket and a second bracket for positioning the base material roll and the coating material roll are respectively fixed, and a third bracket for positioning the finished roll is assembled below the second bracket.

[0009] The main frame has a rotating turntable in the middle with guide rollers, and a processor for processing the surface layer of the base material is installed on the inner side of the main frame near the base material roll. A press is installed on the top inner side of the main frame.

[0010] The base material layer output from the base material roll is fused with the coating layer output from the coating material roll after passing through the outside of the processor and the press to form a finished layer. The finished layer is then wound down by the guide roller to obtain the finished roll.

[0011] Preferably, a guide bracket is assembled between the main frame and the first bracket.

[0012] Preferably, a tensioner is provided on the inner side of the main frame between the guide roller and the finished roll.

[0013] Preferably, the top of the first processor is hinged to the inside of the main frame, and the bottom of the first processor is hinged to a second presser. The second presser drives the bottom of the first processor to rotate around its top hinge point through telescopic movement.

[0014] A coating process for stone paper processing includes the following steps:

[0015] Step A: Substrate production and processing. First, stone paper substrate is produced according to the stone paper process. The stone paper substrate is then horizontally conveyed to the laser irradiation area. The surface of the stone paper substrate is heated by the rapid laser irradiation, causing the calcium carbonate powder particles inside the stone paper to react instantly to form calcium oxide and carbon monoxide gas. This forms a dense bubble layer containing carbon monoxide gas and calcium oxide on the surface of the stone paper substrate. The cooled stone paper with the bubble surface is then conveyed to the grinding process. After grinding, the bubble layer is broken and kept flat. After washing and neutralizing the calcium oxide, the base material roll is obtained.

[0016] Step B: The coating process is carried out. First, the grooved surface of the base material roll passes through the inside of the processor one. After the fine brush on the back of the processor one removes the residual calcium hydroxide, the adhesive is released from the top of the processor one and connected to the outside of the finished roll through the drive roller. The coating material roll that needs to be combined with the base material layer on the outside passes through the press one and is combined with the grooved surface of the base material layer to form the final finished layer.

[0017] Step C: Rewind the finished layer.

[0018] Preferably, in step A, the laser irradiation area uses a linear laser to vertically irradiate the horizontal stone paper;

[0019] During the processing, the depth of laser irradiation on the stone paper is controlled by adjusting the irradiation time of the linear laser within a fixed length unit. ;

[0020] in: It is the density of stone paper ( ), It is the surface area of ​​the laser-irradiated area ( ), It is the depth of heating ( ), It is the specific heat capacity of the material. It's a temperature change. It is the laser power. It is the average irradiation time. Speed ​​of movement with stone paper substrate Inversely proportional.

[0021] Preferred, The algorithm is based on the indoor temperature during processing, and the final heating temperature T1 for the stone paper is 822℃-828℃. (indoor).

[0022] Preferably, during the water washing process, water reacts with the heated calcium oxide to form calcium hydroxide, and after water washing, the calcium hydroxide is carried out from the inside of the air bubble grooves after grinding, and finally the calcium hydroxide residue is further reduced by brushing.

[0023] Preferably, in the calcium oxide cleaning step of step A, a brush can be used to first physically clean and brush off the calcium oxide powder before washing and neutralizing with water.

[0024] Preferably, in step B, the pressing distance between the base material layer and the coating layer is adjusted by adjusting the extension length of the presser.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a processing technology for stone paper coating based on an adhesive coating equipment. Its main application scenario is the coating and bonding method between stone paper substrate and external adhesive decorative layer. Furthermore, it improves the processing of stone paper substrate. Through the processing steps on the surface of stone paper substrate, it solves the problem of uneven processing effect caused by the use of grinding, wire drawing and other rough surface steps in the surface treatment of substrate in the prior art to improve bonding and fusion coating methods, and the problem of uneven surface of finished product after the process of leaving protrusion residue on the substrate surface. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is an assembly diagram of the present invention;

[0028] Figure 3 This is the front view of the present invention;

[0029] Figure 4 This is a schematic diagram of the cross-section of the stone paper base material after grinding according to the present invention.

[0030] In the diagram: 1. Equipment frame, 11. Main frame, 12. Guide bracket, 13. First bracket, 14. Second bracket, 15. Third bracket, 16. Tensioner, 17. Presser 1, 18. Processor 1, 19. Presser 2, 110. Guide roller, 2. Base material roll, 21. Base material layer, 3. Coating material roll, 31. Coating layer, 4. Finished product roll, 41. Finished product layer. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-3 The present invention provides a technical solution: a coating process for stone paper processing, including a machine frame 1, with supports on both sides of the machine frame 1, and a base material roll 2 and a coating material roll 3 that can roll inside the supports. The base material roll 2 and the coating material roll 3 are combined and wound downward to form a finished roll 4 through a coating process.

[0033] The equipment frame 1 includes a main frame 11. A first bracket 13 and a second bracket 14 for positioning the base material roll 2 and the coating material roll 3 are fixed on both sides of the main frame 11, and a third bracket 15 for positioning the finished product roll 4 is assembled below the second bracket 14.

[0034] The main frame 11 has a rotating turntable in the middle with a guide roller 110. The inner side of the main frame 11 near the base material roll 2 is equipped with a processor 18 for processing the surface layer of the base material. The inner top of the main frame 11 is equipped with a press 17.

[0035] The base material layer 21 output from the base material roll 2 is fused with the coating layer 31 output from the coating material roll 3 after passing through the outside of the processor 18 and the press 17 to form the finished layer 41. The finished layer 41 is then wound down by the guide roller 110 to obtain the finished roll 4.

[0036] This invention provides a processing technology for coating stone paper based on an adhesive coating device. Its main application scenario is the coating and bonding method between stone paper substrate and external adhesive decorative layer. It also improves the processing of stone paper substrate. By processing the surface of the stone paper substrate, it solves the problem of uneven processing effect caused by grinding, wire drawing and other rough surface steps usually used in the existing technology to improve the coating method of bonding and fusion. This also solves the problem of uneven surface of finished product after the process, which is caused by the easy leaving of protrusions on the substrate surface.

[0037] Specifically, a guide bracket 12 is assembled between the main frame 11 and the first bracket 13. The guide bracket 12 can be equipped with auxiliary processing equipment such as brush processing equipment, cleaning equipment, gluing equipment, and heating equipment to process the substrate as needed, so as to ensure that the substrate is in the most stable processing state before entering the equipment, and to provide a platform for selectively customizable auxiliary equipment.

[0038] Specifically, a tensioner 16 is provided on the inner side of the main frame 11 between the guide roller 110 and the finished roll 4. The tensioner 16 is used to adjust the tension of the finished layer 41 when winding the material, so as to ensure the stable operation of the winding process. In use, the tensioning effect is provided by adjusting the length of the telescopic part on the top left side and driving the rotating lever assembled at the bottom of the long rod structure.

[0039] Specifically, the top of the processor 18 is hinged to the inside of the main frame 11, and the bottom of the processor 18 is hinged to a presser 19. The presser 19 drives the bottom of the processor 18 to rotate around its top hinge point through telescopic movement. The processor 18 is preferably a brush cleaning device, but a friction device for further grinding or a hanging device for flattening the surface can also be selected. Through the telescopic movement of the presser 19 at the bottom, the working surface of the processor 18 is driven to approach or separate from the required processing surface of the substrate, thereby achieving the effect of controlling the auxiliary processing steps.

[0040] A coating process for stone paper processing includes the following steps:

[0041] Step A: Substrate production and processing. First, stone paper substrate is produced according to the stone paper process. The stone paper substrate is then horizontally conveyed to the laser irradiation area. The surface of the stone paper substrate is heated by the rapid laser irradiation, which causes the calcium carbonate powder particles inside the stone paper to react instantly to form calcium oxide and carbon monoxide gas. This forms a dense bubble layer containing carbon monoxide gas and calcium oxide on the surface of the stone paper substrate. The cooled stone paper with the bubble surface is then conveyed to the grinding process. After grinding, the bubble layer is broken and kept flat. After washing and neutralizing the calcium oxide, the base material roll 2 is obtained.

[0042] Step B: The coating process is carried out. First, the grooved surface of the base material roll 2 passes through the inside of the processor 18. After the fine brush on the back of the processor 18 removes the residual calcium hydroxide, the adhesive is released from the top of the processor 18 to complete the coating process. The coating material roll 3, which needs to be combined with the base material layer 21, passes through the outside of the presser 17 and is combined with the grooved surface of the base material layer 21 to form the final finished layer 41.

[0043] Step C: Rewind the finished layer 41.

[0044] Specifically, in step A, the laser irradiation area uses a linear laser to vertically irradiate the horizontal stone paper;

[0045] During the processing, the depth of laser irradiation on the stone paper is controlled by adjusting the irradiation time of the linear laser within a fixed length unit. ;

[0046] in: It is the density of stone paper ( ), It is the surface area of ​​the laser-irradiated area ( ), It is the depth of heating ( ), It is the specific heat capacity of the material. It's a temperature change. It is the laser power. It is the average irradiation time. Speed ​​of movement with stone paper substrate Inversely proportional.

[0047] Taking a stone paper thickness of 0.5mm as an example,

[0048] The thickness of the stone paper: 0.5 mm (500 micrometers).

[0049] Specific heat capacity of calcium carbonate (CaCO3): approximately 850 J / kg·K.

[0050] Specific heat capacity of high-density polyethylene (HDPE): approximately 1900 J / kg·K.

[0051] The density of stone paper is typically about 1.6 g / cm³. 3 (1600 kg / m 3 ),

[0052] Composition of stone paper: Stone paper is composed of 60% calcium carbonate and 40% HDPE.

[0053] The specific heat capacity of stone paper is:

[0054] ,

[0055] Therefore, assuming an indoor temperature of 25℃, an initial temperature of 25℃, and a target temperature of 825℃, the temperature change Δ? = target temperature - initial temperature = 800K.

[0056] Substituting into the formula, we can obtain the following: ,

[0057] Simplified formula: .

[0058] Therefore, in this embodiment, with the laser emitter power constant, reducing the conveying speed of the stone paper and increasing the laser irradiation time will increase the heating depth. In practical applications, the specific heat capacity of the stone paper and the indoor temperature should be accurately calculated based on the actual factory efficiency, and the equipment for the laser irradiation process preferably adopts dark light operation.

[0059] Specifically, The algorithm is based on the indoor temperature during processing, and the final heating temperature T1 for the stone paper is 822℃-828℃. (Indoors) When the surface of the stone paper is instantaneously heated to this temperature, it can ensure that the calcium carbonate stone powder inside the stone paper reacts instantly without affecting other internal structures of the stone paper.

[0060] Specifically, during the washing process, water reacts with heated calcium oxide to form calcium hydroxide. After washing with water, the calcium hydroxide is carried out from the grooves of the ground bubbles. Finally, the calcium hydroxide residue is further reduced by brushing.

[0061] During processing, the size of the bubbles formed is related to the fineness of the calcium carbonate powder used in the production base layer 21. The finer the calcium carbonate powder, the smaller and denser the bubbles produced. Figure 4 For example, if the generated bubbles are approximated as spherical bubbles, then the depth of grinding determines the depth of the bubble groove, which in turn determines the containment capacity inside the groove.

[0062] The cross-section of the stone paper base material after grinding is as follows: Figure 4 As shown, after heating and foaming, a base material with uniform depressions can be obtained by grinding the surface layer of a fixed thickness, thereby reducing surface burrs and making the grooves more uniform.

[0063] Specifically, in the calcium oxide cleaning step in step A, a brush can be used to physically clean and remove the calcium oxide powder before washing and neutralizing it with water.

[0064] Specifically, in step B, the pressing distance between the base material layer 21 and the coating layer 31 is adjusted by adjusting the extension length of the presser 17.

[0065] The coating layer 31 is any material that needs to be added to the surface of the stone paper. It can be a decorative pattern layer or a printing layer. Alternatively, the mounting position of the coating material roll 3 can be modified into an adhesive extrusion mechanism. The method used in this application is adhesive bonding, which uses the coating layer 31 with adhesive to bond with the treated base material layer 21. Alternatively, depending on the material, heat bonding can be used. The coating layer 31 is preheated and then fused with the base material layer 21 at room temperature. The increased contact area between the treated base material layer 21 and the coating layer allows for better fusion. Compared with the existing double-layer preheating heat bonding method or the untreated heat bonding method, the treated base material layer 21 has a better fusion effect after heat bonding, reduces deformation after heat melting and cooling, effectively prevents deformation of decorative patterns, and only requires heating one side, resulting in low energy consumption.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coating process for stone paper processing, characterized in that: The processing equipment for stone paper coating process includes an equipment frame (1), on both sides of the equipment frame (1) are provided with supports, and a base material roll (2) and a coating material roll (3) that can be rolled are sleeved inside the supports. The base material roll (2) and the coating material roll (3) are wound downward into a finished roll (4) through the coating process. The equipment frame (1) includes a main frame (11), and a first bracket (13) and a second bracket (14) for positioning the base material roll (2) and the coating material roll (3) are fixed on both sides of the main frame (11). A third bracket (15) for positioning the finished product roll (4) is assembled below the second bracket (14). The main frame (11) has a rotating turntable in the middle with a guide roller (110), and the inner side of the main frame (11) near the base material roll (2) is equipped with a processor (18) for processing the surface layer of the base material, and the inner top of the main frame (11) is equipped with a press (17). The base material layer (21) output from the base material roll (2) is fused with the coating layer (31) output from the coating material roll (3) after passing through the outside of the processor (18) and the press (17) to form the finished layer (41). The finished layer (41) is wound down by the guide roller (110) to obtain the finished roll (4). The coating process for stone paper processing includes the following steps: Step A: Substrate production and processing. First, stone paper substrate is produced according to the stone paper process. Then, the substrate is horizontally conveyed to the laser irradiation area. The surface of the stone paper substrate is heated by the rapid laser irradiation, which causes the calcium carbonate powder particles inside the stone paper to react instantly to form calcium oxide and carbon monoxide gas. Then, a dense bubble layer containing carbon monoxide gas and calcium oxide is formed on the surface of the stone paper substrate. Then, the cooled stone paper with the bubble surface is conveyed to the grinding process. After grinding, the bubble layer is broken and kept flat. After washing and neutralizing the calcium oxide, the base material layer is obtained (21). Step B: The coating process is carried out. First, the grooved surface of the base material layer (21) passes through the inside of the processor (18). After the fine brush on the back of the processor (18) removes the residual calcium hydroxide, the adhesive is released from the top of the processor (18) and connected to the outside of the finished roll (4) through the drive roller. The coating layer (31) that needs to be combined with the base material layer (21) is combined with the grooved surface of the base material layer (21) through the outside of the presser (17) to form the final finished layer (41). Step C: Rewind the finished layer (41).

2. The coating process for stone paper processing according to claim 1, characterized in that: A guide bracket (12) is assembled between the main frame (11) and the first bracket (13).

3. The coating process for stone paper processing according to claim 2, characterized in that: A tensioner (16) is provided on the inner side of the main frame (11) between the guide roller (110) and the finished roll (4).

4. The coating process for stone paper processing according to claim 1, characterized in that: The top of the first processor (18) is hinged to the inside of the main frame (11), and the bottom of the first processor (18) is hinged to a second presser (19). The second presser (19) drives the bottom of the first processor (18) to rotate around its top hinge point through telescopic movement.

5. The stone paper coating process according to claim 1, characterized in that: In step A, the laser irradiation area is irradiated vertically with a linear laser onto the horizontal stone paper; During the processing, the depth of laser irradiation on the stone paper is controlled by adjusting the irradiation time of the linear laser within a fixed length unit. ; in: It is the density of stone paper ( ), It is the surface area of ​​the laser-irradiated area ( ), It is the depth of heating ( ), It is the specific heat capacity of the material. It's a temperature change. It is the laser power. It is the average irradiation time. Speed ​​of movement with stone paper substrate Inversely proportional.

6. The stone paper coating process for the processing equipment used in the stone paper coating process according to claim 1, characterized in that: The algorithm is based on the indoor temperature during processing, and the final heating temperature T1 for the stone paper is 822℃-828℃. (indoor).

7. The stone paper coating process according to claim 1, characterized in that: During the water washing process, water reacts with heated calcium oxide to form calcium hydroxide. After water washing, the calcium hydroxide is carried out from the inside of the air bubble grooves after grinding. Finally, the calcium hydroxide residue is further reduced by brushing.

8. The stone paper coating process according to claim 1, characterized in that: In the calcium oxide cleaning step in step A, the calcium oxide powder is first physically cleaned with a brush and then neutralized by washing with water.

9. The stone paper coating process according to claim 1, characterized in that: In step B, the pressing distance between the base material layer (21) and the coating layer (31) is adjusted by adjusting the extension length of the presser (17).

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