A continuous heat transfer assembly and a continuous heat transfer system

Abstract

The application relates to the technical field of metal plate surface decoration, and particularly discloses a continuous heat transfer printing assembly and a continuous heat transfer printing system; wherein the continuous heat transfer printing assembly comprises a heating box and a heating roller; the heating box is used for heating the metal plate passing through; the heating roller is arranged outside the heating box; the heating roller is used for winding and adhering the heated metal plate and the unheated heat transfer printing paper, and simultaneously heating the heat transfer printing paper to an activation temperature. In the scheme, the heating box and the heating roller can heat the metal plate and the heat transfer printing paper respectively, so that the heating temperatures of the two can be regulated respectively. When metal plates with different thicknesses are needed, only the heating temperature of the heating box needs to be adjusted without affecting the heating temperature of the heating roller, so that the continuous heat transfer printing assembly provided by the scheme can use metal plates with different thicknesses, and the applicability of the device is effectively improved.

Description

Technical Field

[0001] This application relates to the field of metal sheet surface decoration technology, and in particular to a continuous heat transfer component and a continuous heat transfer system. Background Technology

[0002] In the field of metal sheet surface decoration processing, heat transfer printing technology is a method for transferring patterns. The process typically involves first heating the metal sheet and heat transfer paper, causing the powder layer on the metal sheet surface to solidify and the heat transfer paper to reach its activation temperature. Then, the metal sheet and heat transfer paper are bonded together for the heat transfer process. The bonding and transfer process between the heat transfer paper and the metal sheet is crucial to the quality of the transferred pattern. This stage is highly temperature-dependent; specifically, it is necessary to ensure the heat transfer paper reaches its activation temperature while avoiding overheating and damage.

[0003] To achieve continuous production, existing heat transfer systems generally adopt an integrated heating furnace structure. During the production process, metal sheets and heat transfer paper are sequentially fed into the heating furnace. The uniform temperature environment provided by the heaters inside the furnace completes the curing of the powder layer on the metal sheet and the activation of the ink on the heat transfer paper, and the two are then bonded together inside the furnace.

[0004] In practical applications, metal sheets of different thicknesses require different heating temperatures, and variations in heating temperature affect the transfer effect of the heat transfer paper. Excessive temperature can cause the heat transfer paper to gelatinize and become damaged, while insufficient temperature can lead to incomplete curing of the powder layer and insufficient adhesion of the pattern. Therefore, to reduce temperature fluctuations, existing heat transfer systems are only compatible with a narrow range of sheet thicknesses, resulting in low system adaptability. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a continuous heat transfer assembly and a continuous heat transfer system to solve the problem of low adaptability of existing heat transfer systems.

[0006] To achieve the above-mentioned technical objectives, the first aspect of this application provides a continuous heat transfer assembly, including: a heating box and a heating roller;

[0007] The heating box is used to heat the metal sheet that passes through;

[0008] The heating roller is disposed outside the heating box;

[0009] The heating roller is used to wrap and bond the heated metal sheet and the unheated heat transfer paper together, while simultaneously heating the heat transfer paper to the activation temperature.

[0010] Furthermore, the heating roller is a heat-conducting oil heating roller.

[0011] Furthermore, it also includes C-shaped pressing kits;

[0012] The C-shaped pressing kit is disposed on the outer periphery of the heating roller and forms a C-shaped pressing channel with the heating roller;

[0013] The C-shaped pressing kit is used to apply bonding pressure to the heating roller;

[0014] The C-shaped pressing channel is used for the metal sheet and the heat transfer paper to enter from one end and exit from the other end.

[0015] Furthermore, the C-shaped pressing kit includes: a flexible fabric layer and multiple support rollers;

[0016] Multiple support rollers are arranged around the outer periphery of the heating roller;

[0017] The flexible fabric layers are wound end to end on multiple support rollers to form a C-shaped closed-loop structure.

[0018] Furthermore, the flexible fabric layer is a high-temperature resistant felt.

[0019] Furthermore, the heating roller is rotatable, and the rotation drives the metal sheet and the heat transfer paper to be conveyed.

[0020] Furthermore, it also includes: a laminating machine;

[0021] The laminating machine is located downstream of the heating roller and is used to coat the non-transfer surface of the metal sheet.

[0022] Furthermore, it also includes: sheet metal take-up rollers and straight-out rollers;

[0023] The sheet metal winding roller is located downstream of the heating roller and is used to wind up the metal sheet.

[0024] The straight-out roller is located between the heating box and the plate winding roller;

[0025] The straight-out roller is used to directly convey the heated metal sheet to the sheet winding roller for winding.

[0026] A second aspect of this application provides a continuous heat transfer system, comprising: a board unwinder, a powder spraying device, a heat transfer paper unwinder, and the continuous heat transfer assembly described in any one of the above.

[0027] The sheet metal unwinding machine is used to unwind metal sheets.

[0028] The powder spraying device is used to spray powder onto the metal sheet to form a powder layer on the metal sheet.

[0029] The heating chamber in the continuous heat transfer assembly is used to heat the metal sheet after powder coating.

[0030] The heat transfer paper unwinder is used to unwind the heat transfer paper to the heating roller in the continuous heat transfer assembly.

[0031] Furthermore, it also includes: a sewing machine;

[0032] The sheet unwinding machine includes multiple types;

[0033] The sewing machine is located downstream of the sheet metal unwinding machine and is used to connect two rolls of the metal sheet.

[0034] Furthermore, it also includes: a preheating box and a cooling fan;

[0035] The powder spraying device includes: a primary powder spraying device and a secondary powder spraying device;

[0036] The primary powder coating equipment is used to powder coat one side of the metal sheet.

[0037] The secondary powder coating equipment is used to powder coat the other side of the metal sheet.

[0038] The preheating box and the cold air blower are located between the primary powder coating equipment and the secondary powder coating equipment;

[0039] The preheating box is used to heat the metal sheet that passes through the primary powder coating equipment;

[0040] The air cooler is used to cure the metal sheet after it has been heated by the preheating box.

[0041] As can be seen from the above technical solutions, this application provides a continuous heat transfer assembly and a continuous heat transfer system; wherein, the continuous heat transfer assembly includes: a heating box and a heating roller; the heating box is used to heat the metal sheet that passes through; the heating roller is disposed outside the heating box; the heating roller is used to wrap and adhere the heated metal sheet and the unheated heat transfer paper, and at the same time heat the heat transfer paper to the activation temperature.

[0042] In this design, the heating chamber and heating roller can heat the metal sheet and heat transfer paper separately, allowing for independent temperature control of both. When metal sheets of different thicknesses are required, only the heating temperature of the heating chamber needs to be adjusted without affecting the heating temperature of the heating roller. Therefore, the continuous heat transfer assembly provided in this design can use metal sheets of different thicknesses, effectively improving the applicability of the device. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a continuous thermal transfer assembly provided in an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the structure of a continuous thermal transfer system provided in an embodiment of this application;

[0046] In the picture:

[0047] 10. Heating box; 20. Heating roller; 30. C-shaped pressing kit; 31. C-shaped pressing track; 32. Flexible fabric layer; 33. Support roller; 40. Laminating machine; 41. Bottom film unwinding roll; 42. Bottom film looper; 50. Sheet winding roller; 60. Straight-out roller; 71. Sheet unwinding machine; 72. Powder spraying device; 721. Primary powder spraying equipment; 722. Secondary powder spraying equipment; 73. Heat transfer paper unwinding machine; 74. Sewing machine; 75. Inlet looper; 76. Outlet looper; 77. Tensioner; 78. Washing line; 79. Drying oven; 80. Transfer paper winding roller; 81. Shearing machine; 82. Passivation machine; 83. Preheating box; 84. Cooling fan; 85. Flanging machine; 86. Laminating machine; 90. Centering machine;

[0048] 100. Metal sheet; 200. Heat transfer paper. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0050] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0052] Please see Figure 1 In the first aspect of this application, a continuous heat transfer assembly is provided, including: a heating box 10 and a heating roller 20; the heating box 10 is used to heat a metal sheet 100 passing through it; the heating roller 20 is disposed outside the heating box 10; the heating roller 20 is used to wrap and adhere the heated metal sheet 100 and the unheated heat transfer paper 200, and at the same time heat the heat transfer paper 200 to the activation temperature.

[0053] In this embodiment, the metal sheet 100 can be a steel plate, aluminum plate, or other metal sheet. The metal sheet 100 entering the heating chamber 10 can be a sheet that has undergone powder spraying treatment. The powder spraying treatment enables a uniform powder layer to be formed on the metal sheet 100. After the powder layer is heated and cured, it can be tightly bonded to the ink pattern of the heat transfer paper 200 to form a pattern.

[0054] In this embodiment, the heating chamber 10 can be a box structure with an inlet and an outlet for the metal sheet 100 to be fed in and out. Furthermore, the heating chamber 10 can be equipped with an independent temperature control module to maintain its temperature within a range sufficient to heat and solidify the powder layer on the metal sheet 100. When metal sheets 100 of different thicknesses are used due to production needs, the temperature of the heating chamber 10 can be adjusted independently without affecting the heat transfer temperature of the heat transfer paper 200, thus broadening the adaptability of the device. Moreover, this solution enables continuous heating of the metal sheet 100 through the heating chamber 10, thereby achieving production continuity, reducing the need for manual intervention, and improving the degree of automation in production.

[0055] In this embodiment, the heating roller 20 can be wound around the metal plate 100 and the heat transfer paper 200 to achieve independent heating and heat preservation of the metal plate 100 and the heat transfer paper 200. By adjusting the heating temperature of the heating roller 20, the heat transfer paper 200 can reach the activation temperature, thereby enabling the ink on the heat transfer paper 200 to be effectively transferred to the powder layer of the metal plate 100.

[0056] In the actual production process, the metal sheet 100 can first undergo pretreatment processes such as cleaning and drying, and after powder coating, it is conveyed into the heating chamber 10 for heating to solidify the powder layer on its surface. After the metal sheet 100 exits the heating chamber 10, it is guided onto the heating roller 20 and conveyed around the heating roller 20. At the same time, the unheated heat transfer paper 200 is released from the heat transfer paper unwinder 73 onto the heating roller 20 and conveyed around the heating roller 20. The heat transfer paper 200 and the metal sheet 100 on the heating roller 20 are configured such that the patterned surface of the heat transfer paper 200 faces the powder layer of the metal sheet 100.

[0057] During the transfer of the metal sheet 100 and the heat transfer paper 200 around the heating roller 20, they adhere to each other. Since the heat transfer paper 200 is heated to its activation temperature by the heating roller 20, the heat transfer process occurs simultaneously as they are conveyed on the heating roller 20. By adjusting the conveying speed of the metal sheet 100 and the heat transfer paper 200, it can be ensured that the heat transfer paper 200 is exited from the heating roller 20 only after the transfer is complete.

[0058] The continuous heat transfer assembly provided in this embodiment can achieve independent temperature control of the metal plate 100 and the heat transfer paper 200, avoiding the mutual restriction between the powder curing temperature and the ink activation temperature. Therefore, it can reduce the damage rate of the heat transfer paper and ensure the transfer effect, thereby broadening the adaptability of the device to the plate.

[0059] In one embodiment, the heating roller 20 is a heat-conducting oil heating roller.

[0060] Specifically, the heating roller 20 is a hollow roller body, with high-temperature heat transfer oil flowing inside and circulating, which can achieve uniform heating of the heating roller 20 and maintain a relatively constant temperature on the outer periphery. Correspondingly, this solution is equipped with a hot oil circulation heating component for heating the heat transfer oil and driving its circulation. This component is prior art and will not be described in detail in this embodiment.

[0061] In this design, the metal sheet 100 can weigh several tons or tens of tons. Therefore, the heating roller 20 has a relatively large size. When using a heat-conducting oil heating roller as the heating roller 20, the circulating heat-conducting oil ensures that the heating roller 20 has a relatively uniform overall temperature, ensuring consistent transfer effects in different areas, thereby guaranteeing consistent transfer quality in continuous production.

[0062] Meanwhile, the inventors discovered that, since heating chambers generally use air as the heating medium, in existing technologies, maintaining a constant temperature for both the metal sheet and the heat transfer paper using a heating chamber is difficult, resulting in significant temperature fluctuations. In this embodiment, by wrapping the metal sheet 100 and the heat transfer paper 20 around the heating roller 20, the heating roller 20 can heat and maintain the temperature of both materials. Furthermore, the direct contact between the two materials reduces temperature fluctuations, bringing their temperatures closer to a constant level, thereby improving the heat transfer effect and ensuring its stability.

[0063] In one embodiment, a C-shaped pressing kit 30 is also included; the C-shaped pressing kit 30 is disposed on the outer periphery of the heating roller 20 and forms a C-shaped pressing channel 31 with the heating roller 20; the C-shaped pressing kit 30 is used to apply bonding pressure to the heating roller 20; the C-shaped pressing channel 31 is used to allow the metal sheet 100 and the heat transfer paper 200 to enter from one end and exit from the other end.

[0064] Specifically, in the actual production process, the winding angle of the metal sheet 100 and the heat transfer paper 200 around the heating roller 20 can be from 180° to 270°.

[0065] For ease of explanation, taking the example where the metal sheet 100 is on the outside and the heat transfer paper 200 is on the inside during the conveying process, the heating roller 20 can provide bonding pressure to the heat transfer paper 200 in the direction towards the metal sheet 100 to promote better bonding between the two. In this embodiment, the C-shaped pressing kit 30 can simultaneously provide bonding pressure to the metal sheet 100 in the direction towards the heat transfer paper 200, thereby further improving the heat transfer effect between the two.

[0066] In practical applications, the C-shaped pressing kit 30 can be selected with a flexible structure. When the metal sheet 100 and the heat transfer paper 200 are not inserted into the C-shaped pressing channel 31, the C-shaped pressing kit 30 itself has a tendency to deform towards the heating roller 20, so that it adheres to the heating roller 20.

[0067] In a more specific embodiment, the C-shaped pressing kit 30 includes: a flexible fabric layer 32 and a plurality of support rollers 33; the plurality of support rollers 33 are arranged around the outer periphery of the heating roller 20; the flexible fabric layer 32 is wound around the plurality of support rollers 33 end to end to form a C-shaped closed loop structure.

[0068] In this embodiment, the multiple support rollers 33 can adjust the layout range and winding angle of the flexible fabric layer 32. After the flexible fabric layer 32 is wound around the multiple support rollers 33, its inner layer has an elastic tendency to deform towards the heating roller 20, so that it can provide flexible pressing force to the metal plate 100 and the heat transfer paper 200 in the C-shaped pressing channel 31 to improve the heat transfer effect.

[0069] In practical applications, the support rollers 33 are all mounted on the support member (not shown in the figure). Furthermore, the position of the support rollers 33 on the support member is adjustable. For example, a drive member (in the prior art) can be configured on the support member to push the support rollers 33 radially, or the position can be adjusted by adjusting the mounting position of the support rollers 33. By adjusting the position of the support rollers 33, the tension of the flexible fabric layer 32 can be adjusted.

[0070] In one embodiment, the flexible fabric layer 32 is a high-temperature resistant felt, which can insulate the space within the insulation range and prevent the heat transferred from the heating roller 20 to the heat transfer paper 200 from dissipating too quickly, thereby further ensuring the heat transfer effect.

[0071] Meanwhile, with the flexible fabric layer 32 in place, the metal sheet 100 and heat transfer paper 200 entering the C-shaped pressing channel 31 can be arranged in any order. Specifically, without the C-shaped pressing kit 30, the outer layer of material is directly exposed to the air, resulting in rapid heat loss. Therefore, the heat transfer paper 200 needs to be positioned on the inner layer of the metal sheet 100. In contrast, in this solution, after entering the C-shaped pressing channel 31, the heat transfer paper 200 can be positioned on the outer layer of the metal sheet 100. The heat insulation and flexible pressing effect of the flexible fabric layer 32 still achieves an effective heat transfer process. Therefore, this solution reduces the requirements for production equipment layout and further improves applicability.

[0072] In this embodiment, the heating roller 20 consists of a metal plate 100, a heat transfer paper 200, and a flexible fabric layer 32, arranged from the inside out. The metal plate 100 and heat transfer paper 200 enter the C-shaped pressing channel 31, with the inner side of the heat transfer paper 200 abutting against the metal plate 100 and the outer side abutting against the flexible fabric layer 32. Specifically, the heating temperature of the metal plate 100 in the heating chamber 10 is higher than the activation temperature of the heat transfer paper 200. Although the temperature of the metal plate 100 exiting the heating chamber 10 gradually decreases, it still maintains a relatively high temperature, ensuring that the metal plate 100 can provide heat to the heat transfer paper 200 after entering the C-shaped pressing channel 31. In this embodiment, the heating roller 20 can conduct heat to the metal plate 100, and then the metal plate 100 can transfer heat to the heat transfer paper 200, thus achieving full utilization of the heat from the metal plate 100. It should be noted that for some thicker metal sheets 100, a blower can be added between the heating box 10 and the heating roller 20 to cool down the metal sheet 100, so as to avoid the metal sheet 100 being damaged by excessive temperature or the heat transfer paper 200 being damaged due to high temperature evaporation of ink, or the transfer color becoming lighter.

[0073] In one embodiment, the heating roller 20 is rotatable and drives the metal sheet 100 and the heat transfer paper 200 to be conveyed by the rotation.

[0074] Specifically, the rotation speed of the heating roller 20 is adapted to the unwinding speed of the metal sheet 100 and the heat transfer paper 200. By rotating the heating roller 20, the risk of misalignment between the outer metal sheet 100 and the heat transfer paper 200 can be reduced, thereby improving the alignment accuracy of the heat transfer.

[0075] In one embodiment, it further includes: a laminating machine 40; the laminating machine 40 is disposed downstream of the heating roller 20 and is used to coat the non-transfer surface of the metal sheet 100.

[0076] In this embodiment, the non-transfer surface refers to the side of the metal sheet 100 without a powder layer. A base film can be applied to the non-transfer surface using a laminating machine 40. The base film can be, for example, a PE anti-rust film or a VCI vapor phase anti-rust film, which adheres closely to the substrate surface to form a physical barrier layer.

[0077] Correspondingly, a bottom film unwinding roll 41 and a bottom film looper 42 are provided upstream of the laminating machine 40.

[0078] In one embodiment, the device further includes: a sheet metal take-up roller 50 and a straight-out roller 60; the sheet metal take-up roller 50 is disposed downstream of the heating roller 20 and is used to take up the metal sheet 100; the straight-out roller 60 is located between the heating box 10 and the sheet metal take-up roller 50; the straight-out roller 60 is used to directly convey the heated metal sheet 100 to the sheet metal take-up roller 50 for taking up.

[0079] In this embodiment, a transfer paper take-up roller 80 is also provided, which is located downstream of the heating roller 20. After the metal sheet 100 and the heat transfer paper 200 are separated from the heating roller 20, the heat transfer paper 200 is conveyed to the transfer paper take-up roller 80 for winding, and the metal sheet 100 is conveyed to the laminating machine 40 for lamination and then wound up by the sheet take-up roller 50.

[0080] Meanwhile, in this embodiment, for some production processes that do not require heat transfer printing, the metal sheet 100 exported from the heating box 10 can be directly exported to the sheet winding roller 5 via the straight output roller 60 without passing through the heating roller 20, thereby improving the flexibility of the device.

[0081] Please see Figure 1 and Figure 2 The second aspect of this application provides a continuous heat transfer system, comprising: a sheet unwinder 71, a powder spraying device 72, a heat transfer paper unwinder 73, and a continuous heat transfer assembly of any one of the above; the sheet unwinder 71 is used to unwind a metal sheet 100; the powder spraying device 72 is used to spray powder onto the metal sheet 100 to form a powder layer on the metal sheet 100; the heating chamber 10 in the continuous heat transfer assembly is used to heat the powder-sprayed metal sheet 100; and the heat transfer paper unwinder 73 is used to unwind heat transfer paper 200 to the heating roller 20 in the continuous heat transfer assembly.

[0082] In this embodiment, the sheet metal unwinding machine 71 is used to unwind the metal sheet 100. Two machines can be set up, one as an unwinding device and the other as a backup device, to ensure the continuity of production.

[0083] Correspondingly, this embodiment may also include a sewing machine 74; the sewing machine 74 is located downstream of the sheet metal unwinding machine 71 and is used to connect two rolls of metal sheet 100. Specifically, after one roll of metal sheet 100 is unwound, its tail end can be fixedly connected to the head end of another roll of metal sheet 100 by sewing to ensure the continuity of production.

[0084] In practical applications, the continuous heat transfer system provided in this embodiment may also include an inlet looper 75, an outlet looper 76, a tensioner 77, a cleaning line 78, a drying oven 79, and a centering machine 90.

[0085] The inlet looper 75 stores a certain length of metal sheet 100, serving as a buffer for unwinding. The outlet looper 76 stores a certain length of metal sheet 100 and can adjust the release speed of the sheet according to the subsequent production speed, thereby buffering the speed difference of subsequent cleaning lines 78, tensioners 77, etc., and ensuring the coordination of subsequent processes. The tensioner 77 can adjust the conveying tension of the metal sheet 100 to ensure flat conveying; in practical applications, multiple tensioners 77 can be set and placed between different devices. The cleaning line 78 is used to remove oil, dust, and other impurities from the surface of the metal sheet 100, providing a clean base for powder coating. The drying oven 79 is used to remove surface moisture from the cleaned sheet to prevent moisture from affecting the powder coating effect; in practical applications, multiple drying ovens 79 can be set to ensure drying effect. The centering machine 90 is used to correct the conveying position of the metal sheet 100 to ensure that the sheet is conveyed in the center; in practical applications, multiple centering machines 90 can be set and placed between different devices to ensure the effect of centering conveying.

[0086] In one embodiment, the cleaning line 78 may include a hot alkaline water machine 781 and a hot water cleaning machine 782. The hot alkaline water machine 781 may be located upstream of the hot water cleaning machine 782, so that the metal sheet 100 is sequentially conveyed through the hot alkaline water machine 781 and the hot water cleaning machine 782. The hot alkaline water machine 781 can specifically remove surface oil and contaminants from the metal sheet 100, and then the hot water cleaning machine 782 rinses the metal sheet 100.

[0087] In one implementation, two drying ovens 79 can be installed downstream of the cleaning line 78. A passivation machine 82 is installed between the two drying ovens 79. The passivation machine 82 can form a passivation film, also known as a chemical conversion film, on the surface of the metal sheet 100, preventing the metal from easily oxidizing after cleaning and drying, and providing an adhesion surface for subsequent powder coating, increasing the adhesion of subsequent layers. In practical applications, the passivation film can be formed by spraying or roller coating with passivation liquid (such as chromium-free passivating agents or chromate passivating agents).

[0088] In one embodiment, the continuous heat transfer system provided in this embodiment further includes a preheating chamber 83 and a cooling fan 84; the powder spraying device 72 includes: a primary powder spraying device 721 and a secondary powder spraying device 722; the primary powder spraying device 721 is used to spray powder onto one side of the metal sheet 100; the secondary powder spraying device 722 is used to spray powder onto the other side of the metal sheet 100; the preheating chamber 83 and the cooling fan 84 are disposed between the primary powder spraying device 721 and the secondary powder spraying device 722; the preheating chamber 83 is used to heat the metal sheet 100 that passes through the primary powder spraying device 721; the cooling fan 84 is used to cure the metal sheet 100 heated by the preheating chamber 83.

[0089] Both the front heating box 83 and the heating box 10 can use infrared heating modules.

[0090] In this embodiment, the primary powder coating device 721 and the secondary powder coating device 722 can respectively perform powder coating on both sides of the metal sheet 100, so that both sides of the metal sheet 100 are covered with layers, thus providing effective protection and decoration for both sides of the metal sheet 100. The preheating box 83 can solidify the powder layer formed after the first powder coating treatment, preventing the powder layer formed in the first stage from detaching during the second powder coating treatment.

[0091] In one implementation, a cooling fan 84 can also be installed downstream of the heating chamber 10 and downstream of the heating roller 20. For example, in the transmission mode where the metal sheet 100 exiting the heating chamber 10 enters the C-shaped pressing channel 31, the heat-transferred metal sheet 100 can be cooled by the downstream cooling fan 84 to stabilize the heat transfer effect. The cooling fan 84 can be located downstream of the laminating machine 40. In the transmission mode where the metal sheet 100 exiting the heating chamber 10 does not enter the C-shaped pressing channel 31 but is directly transmitted to the straight-out roller 60 and the sheet winding roller 50, the cooling fan 84 can be located downstream of the straight-out roller 60.

[0092] In one embodiment, the continuous heat transfer system provided in this embodiment further includes a shearing machine 81. Two shearing machines 81 may be included: an upstream shearing machine 81 located upstream of the sewing machine 74, and a downstream shearing machine 81 located adjacent to the upstream of the sheet metal take-up roller 50. In practical applications, the metal sheet 100 is often conveyed in a coil structure, and during production, edge burrs easily appear at the head and tail of the coil. The upstream shearing machine 81 of the sewing machine 74 can cut the head and tail of the coil during coil changing to remove end edge burrs, improving the flatness and alignment of the tail of one coil with the head of another. The shearing machine 81 adjacent to the sheet metal take-up roller 50 can cut the coil, allowing the transferred metal sheet to be wound up to a preset length, ensuring that the wound product meets dimensional accuracy and usage requirements.

[0093] In one embodiment, a laminating machine 86 may be installed downstream of the heating roller 20 and the laminating machine 40, specifically downstream of the cooling fan 84 and between the downstream shear 81. The laminating machine 86 can cover the transfer surface of the cured metal sheet with a protective film to protect the pattern on the transfer surface.

[0094] In the application, a trimming machine 85 may be installed adjacent to the upstream of the film applicator 86. The trimming machine is capable of removing the burrs from the edge of the base film of the metal sheet 100 to trim the edge of the base film of the metal sheet 100.

[0095] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A continuous thermal transfer assembly, characterized in that, include: Heating box (10) and heating roller (20); The heating box (10) is used to heat the metal sheet (100) that passes through it; The heating roller (20) is disposed outside the heating box (10); The heating roller (20) is used to wind and bond the heated metal plate (100) and the unheated heat transfer paper (200) together, while heating the heat transfer paper (200) to the activation temperature.

2. The continuous heat transfer assembly according to claim 1, characterized in that, The heating roller (20) is a heat-conducting oil heating roller.

3. The continuous heat transfer assembly according to claim 1, characterized in that, It also includes a C-shaped pressing kit (30); The C-shaped pressing kit (30) is disposed on the outer periphery of the heating roller (20) and forms a C-shaped pressing channel (31) with the heating roller (20); The C-shaped pressing kit (30) is used to apply bonding pressure to the heating roller (20); The C-shaped pressing channel (31) is used for the metal sheet (100) and the heat transfer paper (200) to enter from one end and exit from the other end.

4. The continuous heat transfer assembly according to claim 3, characterized in that, The C-shaped pressing kit (30) includes: a flexible fabric layer (32) and a plurality of support rollers (33); Multiple support rollers (33) are arranged around the outer periphery of the heating roller (20); The flexible fabric layer (32) is wound end to end on multiple support rollers (33) to form a C-shaped closed loop structure.

5. The continuous heat transfer assembly according to claim 4, characterized in that, The flexible fabric layer (32) is a high-temperature resistant felt.

6. The continuous thermal transfer assembly according to any one of claims 1 to 5, characterized in that, The heating roller (20) is rotatable and drives the metal plate (100) and the heat transfer paper (200) to be conveyed by the rotation.

7. The continuous thermal transfer assembly according to claim 1, characterized in that, Also includes: Laminating machine (40); The laminating machine (40) is located downstream of the heating roller (20) and is used to coat the non-transfer surface of the metal sheet (100).

8. The continuous heat transfer assembly according to claim 1, characterized in that, Also includes: Sheet winding roll (50) and straight-out roll (60); The sheet metal take-up roller (50) is located downstream of the heating roller (20) and is used to take up the metal sheet (100); The straight-out roller (60) is located between the heating box (10) and the plate winding roller (50); The straight-out roller (60) is used to directly convey the heated metal sheet (100) to the sheet winding roller (50) for winding.

9. A continuous thermal transfer system, characterized in that, include: The sheet unwinder (71), the powder spraying device (72), the heat transfer paper unwinder (73), and the continuous heat transfer assembly as described in any one of claims 1 to 8; The sheet metal unwinding machine (71) is used to unwind metal sheets (100). The powder spraying device (72) is located upstream of the heating box (10); The powder spraying device (72) is used to spray powder onto the metal plate (100) so that a powder layer is formed on the metal plate (100); The heating box (10) in the continuous heat transfer assembly is used to heat the metal sheet (100) after powder spraying. The heat transfer paper unwinder (73) is used to unwind the heat transfer paper (200) to the heating roller (20) in the continuous heat transfer assembly.

10. The continuous thermal transfer system according to claim 9, characterized in that, Also includes: Preheating box (83) and air cooler (84); The powder spraying device (72) includes: a primary powder spraying device (721) and a secondary powder spraying device (722); The primary powder coating equipment (721) is used to powder coat one side of the metal sheet (100); The secondary powder coating equipment (722) is used to powder coat the other side of the metal sheet (100); The preheating box (83) and the air cooler (84) are located between the primary powder spraying equipment (721) and the secondary powder spraying equipment (722); The preheating box (83) is used to heat the metal sheet (100) that passes through the primary powder spraying equipment (721); The air cooler (84) is used to cure the metal plate (100) after it has been heated by the preheating box (83).

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