A high temperature retort bag solventless lamination apparatus and method

Abstract

The present application relates to the technical field, especially to a high-temperature cooking bag solvent-free compounding equipment and method, which reduces the waiting time when replacing the winding roller, realizes process parallel, improves processing efficiency, realizes the formation of three-layer composite film through the unwinding of three groups of winding rollers and the twice compounding process of the forming assembly, improves production efficiency, does not need to set the drying channel, and reduces space occupation; it comprises a support arm and a support roller; six groups of support rollers are respectively rotatably installed on the outer side wall of the support arm, and every three groups of support rollers are respectively rotatably installed on one side of the support arm; it further comprises a driving device, a forming assembly, a base, a spline, a limiting plate, a winding roller, a frame body and a limiting kit; the bottom of the support arm is rotatably installed on the base through the driving device; a plurality of splines and six groups of limiting plates are respectively arranged on the outer side wall of the six groups of support rollers; the winding roller is sleeved on the support roller in sliding fit with the spline.

Description

Technical Field

[0001] The present invention relates to the technical field of solvent-free lamination equipment and method for high-temperature retort pouches. Background Technology

[0002] High-temperature retort pouches are composite plastic film bags that can undergo high-temperature sterilization and heating treatment. They combine the advantages of canning containers and boiling water resistant plastic bags. Food can remain sealed inside the bag and be taken out for consumption after high-temperature sterilization and heating. They are suitable for packaging meat, soy products and other foods. High-temperature retort pouches are usually made of multiple layers of film, such as PET (polyester film) / NY (nylon film) / RCPP (retort cast polypropylene film) and other structures.

[0003] Currently, the lamination production of high-temperature retort pouches mainly adopts the dry lamination method. The process flow is as follows: unwinding, coating with diluted adhesive, drying organic solvent, hot pressing, cooling, and rewinding. Because the adhesive has a high viscosity, it must be diluted with an organic solvent to evenly coat it onto the substrate. This method has the following drawbacks: 1. A large amount of organic solvents are volatilized and emitted during the drying process, causing VOCs pollution, which does not meet increasingly stringent environmental protection requirements; 2. A long drying tunnel is required to heat and dry the coated film, resulting in a large equipment footprint and high energy consumption. 3. When PVDC (polyvinylidene chloride) is used as the intermediate barrier layer, PVDC has a large heat shrinkage rate. During the drying process of dry lamination, it is easy to shrink and wrinkle due to heat, making it difficult to guarantee the quality of the composite.

[0004] In recent years, some companies have begun to try using solvent-free lamination processes to produce high-temperature retort pouches. Solvent-free lamination uses 100% solids adhesives, which are accurately coated by metering rollers, eliminating the need for organic solvent dilution and drying. However, existing solvent-free lamination equipment and methods still have many problems when applied to the production of high-temperature retort pouches: after the film is unwound, a long waiting time is required to replace the film roll, which affects processing efficiency; after lamination, a long curing time is required; and there is a lack of dedicated equipment design for multi-layer lamination of high-temperature retort pouches.

[0005] Therefore, the present invention provides a solvent-free composite device and method for high-temperature retort pouches to solve the problems existing in the prior art. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a solvent-free laminating device and method for high-temperature retort pouches that reduces waiting time during take-up roller replacement, enables parallel processing, improves processing efficiency, and achieves the formation of a three-layer composite film through two composite processes involving the unwinding of three sets of take-up rollers and the forming assembly, thereby improving production efficiency and eliminating the need for drying tunnels, thus reducing space occupation.

[0007] The solvent-free laminating device for high-temperature retort pouches of the present invention includes a support arm and a support roller; Six sets of support rollers are rotatably mounted on the outer side wall of the support arm, with three sets of support rollers rotatably mounted on one side of the support arm; it also includes a drive unit, forming assembly, base, spline, limit plate, take-up roller, frame and limit kit; The bottom of the support arm is rotated and mounted on the base via a drive device; Multiple sets of splines and six sets of limiting plates are respectively set on the outer side wall of the six sets of support rollers; The take-up roller is slidably fitted onto the support roller with a spline, and the first film, the second film and the third film are respectively wound onto three sets of take-up rollers; The frame is located on the side of the support arm, and a forming component is installed on the frame. The forming component is used to press the three layers of film into shape. Each of the six sets of support rollers has an external thread at its end, and six sets of limiting kits are installed at the ends of the six sets of support rollers through threaded engagement. The first film, second film, and third film are wound onto three of the sets of take-up rollers, and then the three wound take-up rollers are respectively fitted onto the three sets of support rollers on the right side of the support arm. Simultaneously, the other three wound take-up rollers are respectively fitted onto the three sets of support rollers on the left side of the support arm. The take-up rollers are fixed to the support rollers through the cooperation of the limiting kits and limiting plates. When high-temperature retort pouch lamination is required, the three sets of take-up rollers on the right side are... The first, second, and third films are simultaneously unwound and fed to the forming assembly. The forming assembly applies adhesive to the first, second, and third films and presses them together. After the three sets of take-up rollers on the right side are unwound, the drive device rotates the support arm. The rotation of the support arm swaps the positions of the take-up rollers on both sides, making it easier to feed the films on the three sets of take-up rollers on the right side to the forming assembly again after the swap. At the same time, the take-up rollers swapped to the left side are disassembled and replaced, reducing the waiting time for take-up roller replacement, realizing parallel processing, and improving processing efficiency.

[0008] Preferably, the molding assembly includes a power assembly, an adhesive application assembly, a pressing assembly, a first conveying roller, a second conveying roller, a third conveying roller, a first support base, a first pressure roller, a guide column, a spring, and a guide roller; The first conveyor roller, the second conveyor roller, and the third conveyor roller are rotatably mounted on the frame via a power assembly; The three sets of first pressure rollers are respectively rotatably mounted on the three sets of first support seats, and the positions of the three sets of first pressure rollers are respectively matched with the first conveyor roller, the second conveyor roller and the third conveyor roller; Multiple sets of guide columns are slidably installed on the frame, and the ends of the multiple sets of guide columns are respectively connected to the outer walls of the three sets of first support seats; Multiple sets of springs are respectively fitted onto the outer walls of multiple sets of guide columns and provide elastic support for multiple sets of first support seats; Multiple sets of guide rollers are rotatably installed on the outer side wall of the frame; The gluing assembly and the pressing assembly are respectively mounted on the frame. The first film is conveyed through the top of the first conveying roller, the second film is conveyed through the bottom of the second conveying roller, and the third film is conveyed through the bottom of the third conveying roller. The first, second, and third conveying rollers are rotated by the power assembly. Multiple sets of springs provide elastic push to the three sets of first support seats, so that the three sets of first support seats drive the three sets of first pressure rollers to move. The three sets of first pressure rollers cooperate with the first, second, and third conveying rollers to roll and convey the three films respectively. Then, multiple sets of guide rollers guide and support the three films respectively. The gluing assembly applies glue to the surfaces of the second and third films respectively. The pressing assembly first heat-presses the first and second films together, and then heat-presses the composite film of the first and second films together with the third film to form a three-layer composite film. The three-layer composite film is formed through the unwinding of three sets of take-up rollers and the two composite processes of the forming component, which improves production efficiency, eliminates the need for drying tunnels, and has a compact structure that reduces space occupation.

[0009] Preferably, the pressing assembly includes a second support base, a first forming roller, a third support base, a second forming roller, a cylinder, and an electric heating jacket; Two sets of second support seats are respectively installed on the outer side wall of the frame; The two sets of first forming rollers are respectively powered by drive motors and mounted on the two sets of second support seats; Two sets of third support seats are respectively installed on the moving ends of multiple sets of cylinders, and the fixed ends of multiple sets of cylinders are all installed on the outer side wall of the frame. Two sets of second forming rollers are respectively rotatably mounted on two sets of third support seats; Four sets of electric heating jackets are respectively installed on two sets of second support seats and two sets of third support seats; the first film and the second film are respectively conveyed to the space between the first set of first forming rollers and the second forming rollers, and are rolled together by the first set of first forming rollers and the first set of second forming rollers. Then, the composite film of the first film and the second film and the third film are conveyed to the space between the second set of first forming rollers and the second forming rollers, and are rolled together by the cooperation of the second set of first forming rollers and the second set of second forming rollers. The four sets of electric heating jackets bake and heat the two sets of first forming rollers and the two sets of second forming rollers respectively, so as to perform hot pressing of the film and improve the convenience of three-layer film lamination.

[0010] Preferably, the power assembly includes a first power motor, a first gear, a pulley, and a belt; The first power motor is installed on the outer wall of the frame; The three sets of first gears are respectively installed on the rotating ends of the first conveyor roller, the second conveyor roller, and the first power motor, and the three sets of first gears mesh with each other; Two sets of pulleys are respectively installed on the rotating ends of the second and third conveyor rollers; The belt is installed on two sets of pulleys. By starting the first power motor, the first power motor drives the first conveyor roller and the second conveyor roller to rotate through three sets of first gears. After the second conveyor roller rotates, it drives the third conveyor roller to rotate through two sets of pulleys and belts. Thus, the first conveyor roller, the second conveyor roller and the third conveyor roller rotate and convey the three kinds of films respectively.

[0011] Preferably, the drive unit includes a second gear, a third gear, a second power motor, a brake disc, and a brake caliper; The second gear is installed on the rotating end of the bottom of the support arm; The second power motor is installed on the inner side wall of the base, and the third gear is set on the output end of the second power motor and meshes with the second gear. The brake disc is mounted on the rotating end of the bottom of the support arm; The brake caliper is installed on the inner side wall of the base, and the position of the brake caliper is matched with the brake disc. The third gear is driven to rotate by the second power motor, and the third gear drives the support arm to rotate through the second gear, so as to facilitate the exchange of positions of the take-up rollers on both sides. The rotation of the brake disc is braked by the brake caliper, thereby locking the rotation of the support arm.

[0012] Preferably, electromagnets are also included; Three sets of electromagnets are respectively positioned and fixedly installed on the outer wall of the frame, corresponding to the positions of the three sets of first support seats. The electromagnets generate magnetic attraction force on the first support seats, causing the first support seats to drive the first pressure rollers to move in the opposite direction, thereby facilitating the creation of gaps between the three sets of first pressure rollers and the first, second, and third conveying rollers, improving the convenience of film passing through.

[0013] Preferably, the adhesive application assembly includes a storage tank, a pump body, a hose, a delivery pipe, and an adhesive spray head; The pump body inlet is connected to the storage tank, and the pump body outlet is connected to a T-junction pipe. The bottom of the two sets of hoses is connected to the output end of the three-way pipe, and the top of the two sets of hoses is connected to the two sets of conveying pipes respectively. The two sets of conveying pipes are installed on the outer wall of the frame. Two sets of spray nozzles are connected to two sets of delivery pipes respectively; the pump body delivers the adhesive from the storage tank to the two sets of delivery pipes through two sets of hoses, and sprays the adhesive onto the surfaces of the second and third films through the two sets of spray nozzles respectively.

[0014] Preferably, a solvent-free lamination method for high-temperature retort pouches includes the following steps: S1. The first film, the second film, and the third film are respectively wound onto three sets of take-up rollers, and the three sets of take-up rollers after winding are respectively fitted onto the three sets of support rollers on the right side of the support arm; at the same time, the other three sets of take-up rollers after winding are respectively fitted onto the three sets of support rollers on the left side of the support arm; through the cooperation of the limiting kit and the limiting plate, each take-up roller is axially fixed to the corresponding support roller, and the rotational power is transmitted through the spline; S2. Simultaneously unwind the first film, the second film, and the third film from the three sets of take-up rollers on the right side and convey them to the forming assembly respectively; wherein, the first film is conveyed through the top of the first conveyor roller, the second film is conveyed through the bottom of the second conveyor roller, and the third film is conveyed through the bottom of the third conveyor roller. S3. The first conveying roller, the second conveying roller, and the third conveying roller are driven to rotate by the power component, and the first support seat is pushed by the spring to make the first pressure roller cooperate with the corresponding conveying roller, so as to roll and convey the three films respectively; then, the three films are guided and supported by multiple sets of guide rollers and conveyed to the coating component and the pressing component. S4. Apply solvent-free adhesive to the surfaces of the second and third films respectively using the coating assembly; S5. The first film and the second film are conveyed to the first group of first forming rollers and second forming rollers, heated by an electric heating jacket and rolled together to form the first composite film. S6. The first composite film and the third film are conveyed to the second group between the first forming roller and the second forming roller, heated by an electric heating jacket and rolled together to form a three-layer composite film. S7. After the three sets of winding rollers on the right side have finished unwinding, the support arm is driven to rotate by the drive device to exchange the positions of the winding rollers on the left and right sides, so that the fully loaded winding rollers on the right side that have been replaced can continue to unwind, while the empty winding rollers that have been exchanged to the left side are disassembled and replaced with new fully loaded winding rollers, so as to achieve parallel operation of the process. Preferably, in S3, the first support seat is attracted by the electromagnet when it is energized, so that the first pressure roller is separated from the corresponding conveying roller to facilitate the film insertion. After the power is cut off, the spring resets and presses it back. Preferably, in S7, when the support arm rotates, the third gear is driven by the second power motor to mesh with the second gear for transmission, and after rotating into position, the brake disc is clamped by the brake caliper to achieve locking and positioning.

[0015] Compared with the prior art, the beneficial effects of the present invention are: reducing the waiting time when changing the take-up rollers, realizing parallel processing, improving processing efficiency, and forming a three-layer composite film through the unwinding of three sets of take-up rollers and the two composite processes of the forming components, thereby improving production efficiency, eliminating the need to set up drying tunnels, and reducing space occupation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the isometric structure of the present invention; Figure 2 This is a partial isometric structural diagram of the connection between the support arm and the support roller, etc. Figure 3 This is a partial isometric structural diagram showing the connection between the frame and guide rollers, etc. Figure 4 This is a partial isometric structural diagram showing the connection between the third support and the electric heating sleeve, etc. Figure 5 This is a partial isometric structural diagram of the connection between the first support base and the first pressure roller, etc. Figure 6 This is a partial isometric structural diagram showing the connection between the frame and the second support base, etc. Figure 7 This is a partial isometric structural diagram of the connection between the support roller and the limiting assembly, etc. Figure 8 This is a partial isometric structural diagram of the connection between the hose and the delivery pipe, etc. Figure 9 This is a partial isometric structural diagram of the connection between the base and the support arm, etc.

[0017] In the attached diagram, the following are marked: 101, base; 102, support arm; 103, support roller; 104, spline; 105, limiting plate; 106, take-up roller; 107, frame; 108, limiting kit; 201, first conveyor roller; 202, second conveyor roller; 203, third conveyor roller; 204, first support seat; 205, first pressure roller; 206, guide post; 207, spring; 208, guide roller; 301, second support seat; 302, first forming roller; 3 03. Third support base; 304. Second forming roller; 305. Cylinder; 306. Electric heating jacket; 401. First power motor; 402. First gear; 403. Pulley; 404. Belt; 501. Second gear; 502. Third gear; 503. Second power motor; 504. Brake disc; 505. Brake caliper; 601. Electromagnet; 701. Storage tank; 702. Pump body; 703. Hose; 704. Delivery pipe; 705. Spray nozzle. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Example 1

[0019] like Figures 1 to 9As shown, a solvent-free high-temperature retort pouch composite device of the present invention includes a support arm 102 and a support roller 103. Six sets of support rollers 103 are rotatably mounted on the outer side wall of the support arm 102, and three sets of support rollers 103 are rotatably mounted on one side of the support arm 102. The equipment also includes a drive unit, a forming assembly, a base 101, splines 104, limiting plates 105, take-up rollers 106, a frame 107, and limiting kits 108. The bottom of the support arm 102 is rotatably mounted on the base 101 via the drive unit. Multiple sets of splines 104 and six sets of limiting plates 105 are respectively disposed on the outer side walls of six sets of support rollers 103. The take-up roller 106 is slidably fitted onto the support roller 103 with the splines 104. The first film, the second film, and the third film are respectively wound around three sets of take-up rollers 106. The frame 107 is disposed on the side of the support arm 102, and a forming assembly is disposed on the frame 107. The forming assembly is used to press the three-layer film into shape. The ends of the six sets of support rollers 103 are respectively provided with external threads, and the six sets of limiting kits 108 are respectively installed on the six sets of support rollers 103 via threaded engagement. At the end of the support roller 103, the limiting kit 108 is preferably an annular end cap with internal threads. Its outer side wall can be provided with anti-slip knurling to facilitate manual tightening. The limiting kit 108 and the limiting plate 105 form an axial clamping and positioning of the take-up roller 106. The sliding fit between the take-up roller 106 and the spline 104 allows the take-up roller 106 to rotate synchronously with the support roller 103 after being fitted onto it, thus achieving effective torque transmission. The support arm 102 adopts a high-strength steel welded structure, and its bottom is provided with a rotating journal. The rotating journal is installed in the base 101 through a bearing assembly to ensure that the support arm 102 can rotate smoothly under the action of the drive device. The base 101 is a square seat body cast in one piece, and its bottom is provided with anchor bolt mounting holes to facilitate fixing the equipment to the workshop floor.

[0020] In this embodiment, the molding assembly includes a power assembly, an adhesive application assembly, a pressing assembly, a first conveying roller 201, a second conveying roller 202, a third conveying roller 203, a first support seat 204, a first pressure roller 205, guide posts 206, springs 207, and guide rollers 208. The first conveying roller 201, the second conveying roller 202, and the third conveying roller 203 are rotatably mounted on the frame 107 via the power assembly. The three sets of first pressure rollers 205 are rotatably mounted on the three sets of first support seats 204, and the positions of the three sets of first pressure rollers 205 are respectively configured to cooperate with the first conveying roller 201, the second conveying roller 202, and the third conveying roller 203. Multiple sets of guide posts 206 are slidably mounted on the frame 107, and the ends of the multiple sets of guide posts 206 are respectively connected to the outer walls of the three sets of first support seats 204. Multiple sets of springs 207 are respectively fitted onto the outer walls of the multiple sets of guide posts 206 and provide elastic support to the multiple sets of first support seats 204.

[0021] It should be noted that the three sets of support rollers 103 arranged on the left and right sides of the support arm 102 are arranged in an equilateral triangle or arc shape to ensure that the spacing between the three sets of winding rollers 106 is uniform, so that the three sets of films can be unwound at the same time without interfering with each other.

[0022] In the operation of this embodiment, the operator winds the first film, the second film, and the third film onto three sets of take-up rollers 106, respectively. Then, the three sets of take-up rollers 106 are respectively mounted onto three sets of support rollers 103 on the right side of the support arm 102. Simultaneously, three other sets of wind-up rollers 106 are mounted onto three sets of support rollers 103 on the left side of the support arm 102 as spares. The limiting kit 108 and the limiting plate 105 cooperate to axially fix each take-up roller 106 to the corresponding support roller 10. 3. When high-temperature retort pouches need to be laminated, the first film, second film, and third film on the three sets of winding rollers 106 on the right are simultaneously unwound and conveyed to the forming assembly. The first film is conveyed through the top of the first conveyor roller 201, the second film through the bottom of the second conveyor roller 202, and the third film through the bottom of the third conveyor roller 203. The first conveyor rollers 201, 202, and 303 are driven to rotate by the power assembly. Multiple sets of springs 207 provide elastic push to the three sets of first support seats 204, causing the three sets of first support seats 204 to drive the three sets of first pressure rollers 205 to move. The three sets of first pressure rollers 205 cooperate with the first conveyor rollers 201, 202, and 303 respectively to roll and convey the three films. Subsequently, multiple sets of guide rollers 208 provide conveying, guiding, and support for the three films. The coating assembly applies solvent-free adhesive to the surfaces of the second and third films respectively. The pressing assembly first presses the first and second films together. The first composite film is formed by hot pressing the film together. Then, the first composite film and the third film are hot-pressed together by the pressing assembly to form a three-layer composite film. After the three sets of take-up rollers 106 on the right side are unwound, the support arm 102 is rotated by the drive device. After the support arm 102 rotates 180 degrees, the take-up rollers 106 on the left and right sides are exchanged. This causes the three sets of take-up rollers 106 that were fully loaded on the left side before the exchange to rotate to the right side to continue unwinding. At the same time, the empty take-up rollers 106 that were exchanged to the left side are disassembled and replaced with new fully loaded take-up rollers 106.

[0023] The technical advantages of this embodiment are as follows: By using three sets of take-up rollers 106 symmetrically arranged on the left and right sides of the support arm 102 and a rotary switching structure driven by the drive device, online rapid switching of the take-up rollers in the unwinding process is realized, reducing the waiting time when changing the take-up rollers and enabling the equipment to carry out continuous and uninterrupted composite production. Through the simultaneous unwinding of the three sets of take-up rollers 106 and the two composite processes of the forming components, the three-layer composite film is formed in one step, effectively improving production efficiency. At the same time, the equipment uses solvent-free adhesives for coating and lamination, eliminating the need for drying tunnels, greatly reducing the space occupied by the equipment, and avoiding VOC pollution problems caused by the volatilization of organic solvents. Example 2

[0024] like Figures 1 to 9 As shown, based on Embodiment 1, the pressing assembly includes a second support base 301, a first forming roller 302, a third support base 303, a second forming roller 304, a cylinder 305, and an electric heating sleeve 306. Two sets of second support bases 301 are respectively fixedly installed on the outer side wall of the frame 107. Two sets of first forming rollers 302 are respectively powered by a drive motor and rotated on the two sets of second support bases 301. Two sets of third support bases 303 are respectively installed on the moving ends of multiple sets of cylinders 305. The fixed ends of multiple sets of cylinders 305 are all fixedly installed on the outer side wall of the frame 107. Two sets of second forming rollers 304 are respectively rotated and installed on the two sets of third support bases 303. Four sets of electric heating sleeves 306 are respectively installed on the two sets of second support bases 301 and the two sets of third support bases 303 and respectively sleeved on the outer periphery of the first forming roller 302 and the second forming roller 304.

[0025] The electric heating jacket 306 is an annular ceramic heating coil or an electromagnetic induction heating coil. Its inner diameter has a gap of 1 mm to 3 mm between it and the outer diameter of the first forming roller 302 and the second forming roller 304. The electric heating jacket 306 is fixedly installed on the second support base 301 and the third support base 303 by a bracket. The heating temperature of the electric heating jacket 306 is controlled by a temperature controller using PID closed-loop control. The temperature controller collects the surface temperature of the first forming roller 302 and the second forming roller 304 through thermocouples and feeds back to adjust the heating power of the electric heating jacket 306 so that the roller surface temperature is maintained within the set composite temperature range. The preferred composite temperature is 50°C to 80°C to meet the activation temperature requirements of solvent-free adhesives.

[0026] As a preferred embodiment, the surfaces of the first forming roller 302 and the second forming roller 304 may be provided with a Teflon anti-stick coating to prevent the molten adhesive from adhering to the roller surface and affecting the composite quality.

[0027] In the second embodiment, the first film and the second film are respectively conveyed between the first set of first forming rollers 302 and second forming rollers 304, and are rolled together by the first set of first forming rollers 302 and first set of second forming rollers 304. Then, the first composite film and the third film formed by the first film and the second film are conveyed between the second set of first forming rollers 302 and second forming rollers 304, and are rolled together by the cooperation of the second set of first forming rollers 302 and second set of second forming rollers 304. During the lamination process, four sets of electric heating jackets 306 are used. The two sets of first forming rollers 302 and two sets of second forming rollers 304 are baked and heated to raise the surface temperature of the first forming rollers 302 and the second forming rollers 304 to a set value. When the film passes through the pressing gap between the first forming rollers 302 and the second forming rollers 304, it is heated and pressed, which activates the solvent-free adhesive coated on the surface of the second film and the third film and achieves adhesion. The pressing gap and pressing force between the first forming rollers 302 and the second forming rollers 304 can be adjusted by adjusting the air supply pressure of the cylinder 305 to meet the composite requirements of films with different thicknesses.

[0028] The technical advantages of this embodiment are as follows: The cooperative structure of two sets of sequentially arranged first forming rollers 302 and second forming rollers 304 enables step-by-step lamination of the three-layer film. First, the first and second films are laminated to form an intermediate composite film, which is then laminated with the third film to form the final three-layer composite film, ensuring the quality of lamination between each layer. The electric heating jacket 306 independently heats each forming roller, allowing for independent temperature adjustment and control at each lamination station. This adapts to the different temperature requirements of films made of different materials, improving the equipment's process adaptability and the stability of lamination quality. The cylinder 305 drives the second forming roller 304 to move, adjusting the pressing pressure, making the control of the pressing force more precise and flexible, ensuring the uniformity of the bonding strength between the composite film layers.

[0029] The power assembly includes a first power motor 401, a first gear 402, a pulley 403, and a belt 404. The first power motor 401 is fixedly mounted on the outer wall of the frame 107. Three sets of first gears 402 are respectively mounted on the rotating ends of the first conveyor roller 201, the second conveyor roller 202, and the first power motor 401, and the three sets of first gears 402 mesh with each other sequentially. Two sets of pulleys 403 are respectively mounted on the rotating ends of the second conveyor roller 202 and the third conveyor roller 203. The belt 404 is fitted onto the two sets of pulleys 403. The first power motor 401 is preferably a servo motor or a three-phase asynchronous motor, and a drive gear is mounted on its output shaft. This drive gear engages with a first gear mounted on the end of the second conveyor roller 202. Gear 402 meshes, and the first gear 402 at the end of the second conveying roller 202 meshes simultaneously with the first gear 402 installed at the end of the first conveying roller 201, thereby enabling the first power motor 401 to drive the first conveying roller 201 and the second conveying roller 202 to rotate synchronously. The two sets of pulleys 403 are the driving pulley and the driven pulley, respectively. The driving pulley is installed at the rotating end of the second conveying roller 202 and is located outside the first gear 402. The driven pulley is installed at the rotating end of the third conveying roller 203. The belt 404 is a synchronous toothed belt or a V-belt. The rotational power of the second conveying roller 202 is transmitted to the third conveying roller 203 through the transmission of the belt 404, so that the third conveying roller 203 rotates in the same direction as the second conveying roller 202.

[0030] The drive unit includes a second gear 501, a third gear 502, a second power motor 503, a brake disc 504, and a brake caliper 505. The second gear 501 is fixedly installed on the bottom rotating end of the support arm 102. The second power motor 503 is fixedly installed on the inner wall of the base 101. The third gear 502 is located on the output end of the second power motor 503 and meshes with the second gear 501. The brake disc 504 is fixedly installed on the bottom rotating end of the support arm 102 and is located above or below the second gear 501. The brake caliper 505 is fixedly installed on the inner wall of the base 101. The position of the brake caliper 505 matches that of the brake disc 504. The brake caliper 505 is a pneumatic or hydraulically driven caliper brake. It has two friction plates inside, which are located on both sides of the brake disc 504. When the brake caliper 505 is activated, the two friction plates clamp the brake disc 504 and achieve braking and locking through friction.

[0031] Preferably, the second gear 501 and the third gear 502 form a reduction gear pair, wherein the second gear 501 has more teeth than the third gear 502 to achieve speed reduction and torque increase, ensuring that the support arm 102 rotates smoothly. The outer circumferential surface or end face of the brake disc 504 is a friction working surface, and its surface is hardened to improve wear resistance.

[0032] As an alternative, the drive unit can also use a worm gear reducer motor to directly drive the support arm 102 to rotate. The worm gear mechanism has a self-locking characteristic, which can keep the position of the support arm 102 locked in the power-off state, thus eliminating the need for the brake disc 504 and brake caliper 505.

[0033] The device also includes electromagnets 601. Three sets of electromagnets 601 are respectively set and fixedly installed on the outer wall of the frame 107, corresponding to the positions of the three sets of first support seats 204. The electromagnets 601 are DC electromagnets, and their iron core end faces the corresponding end face of the first support seat 204. When the electromagnet 601 is energized, it generates a magnetic attraction force to attract the first support seat 204 to move closer to the electromagnet 601, thereby overcoming the elastic force of the spring 207 and separating the first pressure roller 205 from the corresponding conveying roller.

[0034] The adhesive application assembly includes a storage tank 701, a pump body 702, hoses 703, delivery pipes 704, and spray nozzles 705. The input end of the pump body 702 is connected to the storage tank 701 via a pipeline, and the output end of the pump body 702 is connected to a T-junction. The bottoms of two sets of hoses 703 are connected to the two output ends of the T-junction, and the tops of the two sets of hoses 703 are connected to two sets of delivery pipes 704. The two sets of delivery pipes 704 are fixedly installed on the outer wall of the frame 107. The two sets of spray nozzles 705 are connected to the two sets of delivery pipes 704. The storage tank 701 is used to hold solvent-free adhesive. A stirring device may be installed inside the storage tank 701 to prevent the adhesive from settling or curing. The pump body 702 is a metering pump or a gear pump used to pump the adhesive from the storage tank 701. The adhesive is quantitatively conveyed to the spray nozzle 705. The hose 703 is a pressure-resistant rubber hose or a polytetrafluoroethylene hose, which has a certain degree of flexibility to facilitate installation and adapt to possible vibrations. The conveying pipe 704 is a stainless steel rigid pipe, which extends along the outer wall of the frame 107 to the corresponding spraying position. The spray nozzle 705 is a fan-shaped spray nozzle or a linear coating nozzle, which sprays the adhesive onto the film surface in a mist or line form. The spraying width of the spray nozzle 705 matches the width of the film. Two sets of spray nozzles 705 can be set, corresponding to the coating positions of the second film and the third film, respectively. Preferably, the installation position of the spray nozzle 705 is close to the feed end of the pressing component to reduce the influence of the change in the surface tension of the adhesive on the coating uniformity during the transmission of the film after coating.

[0035] The equipment of the present invention adopts a modular design. The support arm 102 and the base 101 form a rotation and repositioning module. The frame 107, the conveying rollers and the pressing components form a composite processing module. The gluing component is an independent functional module. The modules are connected to each other through standard mechanical and electrical interfaces, which facilitates the manufacturing, transportation, installation and maintenance of the equipment.

[0036] In terms of electrical control, the electrical equipment involved in this invention, such as the first power motor 401, the second power motor 503, the electromagnet 601, the pump body 702, the electric heating jacket 306, and the control valve group of the cylinder 305, are all electrically connected to a programmable logic controller (PLC). The PLC is a conventional industrial control device in the prior art, and it has a pre-set control program to coordinate the action sequence of each electrical device, such as controlling the rotation timing of the support arm 102, the start and stop of each conveying roller, the start and stop of the glue pump, and the setting and adjustment of the heating temperature. The power supply cables of each electrical device are all run through cable trays or metal flexible conduits. The cable trays are arranged along the outer side walls of the frame 107 and the base 101 to avoid the cables being exposed to the external environment. The PLC control cabinet is set next to the equipment. The cabinet is a sealed structure, and a waterproof sealing strip is set at the cabinet door to ensure that the electrical equipment has reliable waterproof and dustproof performance in the workshop environment.

[0037] 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 variations can be made to these embodiments without departing from the principles and spirit of the invention. For example, in addition to using gear drives and belt drives, chain drives can also be used to achieve power transmission between the conveying rollers; in addition to using a cylinder to drive the second forming roller to move, a hydraulic cylinder or an electric push rod can also be used as an alternative drive source; in addition to using three sets of take-up rollers to unwind simultaneously, two or four sets of take-up rollers can be set according to the required number of composite film layers. The scope of the invention is defined by the appended claims and their equivalents. Example 3

[0038] The present invention provides a solvent-free lamination method for high-temperature retort pouches, comprising the following steps: S1. The first film, the second film, and the third film are respectively wound onto three sets of take-up rollers 106, and the three sets of take-up rollers 106 after winding are respectively mounted onto three sets of support rollers 103 on the right side of the support arm 102; at the same time, the other three sets of take-up rollers 106 after winding are respectively mounted onto three sets of support rollers 103 on the left side of the support arm 102; through the cooperation of the limiting kit 108 and the limiting plate 105, each take-up roller 106 is axially fixed to the corresponding support roller 103, and the rotational power is transmitted through the spline 104; S2. Simultaneously unwind the first film, the second film, and the third film on the three sets of take-up rollers 106 on the right side, and convey them to the forming assembly respectively; wherein, the first film is conveyed through the top of the first conveying roller 201, the second film is conveyed through the bottom of the second conveying roller 202, and the third film is conveyed through the bottom of the third conveying roller 203. S3. The first conveying roller 201, the second conveying roller 202 and the third conveying roller 203 are driven to rotate by the power component, and the first support seat 204 is pushed by the spring 207 to make the first pressure roller 205 cooperate with the corresponding conveying rollers to roll and convey the three films respectively; then, the three films are guided and supported by multiple sets of guide rollers 208 to convey them to the coating component and the pressing component. S4. Apply solvent-free adhesive to the surfaces of the second and third films respectively using the coating assembly; S5. The first film and the second film are conveyed to the first group of first forming rollers 302 and second forming rollers 304, and heated by electric heating sleeve 306 and rolled together to form the first composite film. S6. The first composite film and the third film are conveyed to the second group between the first forming roller 302 and the second forming roller 304, and heated and rolled together by the electric heating jacket 306 to form a three-layer composite film. S7. After the three sets of take-up rollers 106 on the right side have finished unwinding, the support arm 102 is driven to rotate by the drive device to exchange the positions of the take-up rollers 106 on the left and right sides, so that the fully loaded take-up roller 106 on the right side that has been replaced can continue to unwind, while the empty take-up roller 106 that has been exchanged to the left side is disassembled and replaced with a new fully loaded take-up roller 106, so as to achieve parallel operation of the process.

[0039] 9. The solvent-free lamination method for high-temperature retort pouches as described in claim 8, characterized in that, in S3, the first support seat 204 is attracted by the electromagnet 601, so that the first pressure roller 205 is separated from the corresponding conveying roller to facilitate film insertion, and after the power is cut off, it is reset and pressed by the spring 207.

[0040] 10. The solvent-free composite method for high-temperature retort pouches as described in claim 8, characterized in that, in S7, when the support arm 102 rotates, the third gear 502 is driven by the second power motor 503 to mesh with the second gear 501 for transmission, and after rotating to the position, the brake caliper 505 clamps the brake disc 504 to achieve locking and positioning.

[0041] It should be noted that the cylinder 305, electric heating jacket 306, first power motor 401, second power motor 503, brake caliper 505, electromagnet 601, and pump body 702 of the solvent-free composite equipment and method for high-temperature retort pouches of the present invention are all commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

Claims

1. A solvent-free composite device for high-temperature retort pouches, comprising a support arm (102) and a support roller (103). Six sets of support rollers (103) are rotatably mounted on the outer wall of the support arm (102), and three sets of support rollers (103) are rotatably mounted on one side of the support arm (102); characterized in that, It also includes a drive unit, a forming assembly, a base (101), a spline (104), a limiting plate (105), a take-up roller (106), a frame (107), and a limiting kit (108). The bottom of the support arm (102) is rotatably mounted on the base (101) via a drive device; Multiple sets of splines (104) and six sets of limiting plates (105) are respectively set on the outer side wall of the six sets of support rollers (103); The take-up roller (106) and spline (104) are slidably fitted on the support roller (103), and the first film, the second film and the third film are respectively wound on three sets of take-up rollers (106); The frame (107) is located on the side of the support arm (102), and a molding assembly is provided on the frame (107) for pressing the three-layer film into shape; The ends of the six sets of support rollers (103) are respectively provided with external threads, and the six sets of limit kits (108) are respectively installed at the ends of the six sets of support rollers (103) through thread engagement.

2. The solvent-free laminating equipment for high-temperature retort pouches as described in claim 1, characterized in that, The molding assembly includes a power assembly, an adhesive application assembly, a pressing assembly, a first conveying roller (201), a second conveying roller (202), a third conveying roller (203), a first support base (204), a first pressure roller (205), a guide post (206), a spring (207), and a guide roller (208). The first conveyor roller (201), the second conveyor roller (202) and the third conveyor roller (203) are respectively rotatably mounted on the frame (107) via a power assembly; The three sets of first pressure rollers (205) are rotatably mounted on the three sets of first support seats (204), and the positions of the three sets of first pressure rollers (205) are respectively matched with the first conveying roller (201), the second conveying roller (202) and the third conveying roller (203); Multiple sets of guide columns (206) are slidably installed on the frame (107), and the ends of the multiple sets of guide columns (206) are respectively connected to the outer walls of the three sets of first support seats (204); Multiple sets of springs (207) are respectively fitted on the outer walls of multiple sets of guide columns (206) and provide elastic support to multiple sets of first support seats (204); Multiple sets of guide rollers (208) are rotatably installed on the outer side wall of the frame (107); The gluing assembly and the pressing assembly are respectively mounted on the frame (107).

3. The solvent-free laminating equipment for high-temperature retort pouches as described in claim 1, characterized in that, The pressing assembly includes a second support base (301), a first forming roller (302), a third support base (303), a second forming roller (304), a cylinder (305), and an electric heating jacket (306). Two sets of second support seats (301) are respectively installed on the outer side wall of the frame (107); The two sets of first forming rollers (302) are respectively powered by drive motors and mounted on the two sets of second support seats (301); Two sets of third support seats (303) are respectively installed on the moving ends of multiple sets of cylinders (305), and the fixed ends of multiple sets of cylinders (305) are all installed on the outer wall of the frame (107); Two sets of second forming rollers (304) are rotatably mounted on two sets of third support seats (303); Four sets of electric heating jackets (306) are respectively installed on two sets of second support bases (301) and two sets of third support bases (303).

4. The solvent-free laminating equipment for high-temperature retort pouches as described in claim 2, characterized in that, The power assembly includes a first power motor (401), a first gear (402), a pulley (403), and a belt (404). The first power motor (401) is installed on the outer wall of the frame (107); Three sets of first gears (402) are respectively installed on the rotating ends of the first conveying roller (201), the second conveying roller (202) and the first power motor (401), and the three sets of first gears (402) mesh with each other; Two sets of pulleys (403) are respectively installed on the rotating ends of the second conveyor roller (202) and the third conveyor roller (203); The belt (404) is fitted onto two sets of pulleys (403).

5. The solvent-free laminating equipment for high-temperature retort pouches as described in claim 1, characterized in that, The drive unit includes a second gear (501), a third gear (502), a second power motor (503), a brake disc (504), and a brake caliper (505). The second gear (501) is mounted on the rotating end of the bottom of the support arm (102); The second power motor (503) is mounted on the inner side wall of the base (101), and the third gear (502) is set on the output end of the second power motor (503) and meshes with the second gear (501); The brake disc (504) is mounted on the bottom rotating end of the support arm (102); The brake caliper (505) is mounted on the inner side wall of the base (101), and the position of the brake caliper (505) is matched with that of the brake disc (504).

6. The solvent-free laminating equipment for high-temperature retort pouches as described in claim 2, characterized in that, It also includes electromagnets (601). The three sets of electromagnets (601) are respectively set and fixed on the outer wall of the frame (107) corresponding to the positions of the three sets of first support bases (204).

7. The solvent-free laminating equipment for high-temperature retort pouches as described in claim 1, characterized in that, The adhesive application assembly includes a storage tank (701), a pump body (702), a hose (703), a delivery pipe (704), and an adhesive spray head (705). The pump body (702) input end is connected to the storage tank (701), and the pump body (702) output end is connected to a three-way pipe; The bottom of the two sets of hoses (703) are connected to the output end of the three-way pipe, and the top of the two sets of hoses (703) are connected to the two sets of conveying pipes (704) respectively. The two sets of conveying pipes (704) are respectively installed on the outer wall of the frame (107); Two sets of spray nozzles (705) are respectively connected and installed on two sets of delivery pipes (704).

8. A solvent-free lamination method for high-temperature retort pouches, characterized in that, Includes the following steps: S1. The first film, the second film, and the third film are wound onto three sets of take-up rollers (106) respectively, and the three sets of take-up rollers (106) after winding are respectively mounted on the three sets of support rollers (103) on the right side of the support arm (102); at the same time, the other three sets of take-up rollers (106) after winding are respectively mounted on the three sets of support rollers (103) on the left side of the support arm (102); through the cooperation of the limiting kit (108) and the limiting plate (105), each take-up roller (106) is axially fixed on the corresponding support roller (103), and the rotational power is transmitted through the spline (104); S2. The first film, the second film and the third film on the three sets of take-up rollers (106) on the right side are unwound at the same time and conveyed to the forming assembly respectively; wherein, the first film is conveyed through the top of the first conveying roller (201), the second film is conveyed through the bottom of the second conveying roller (202), and the third film is conveyed through the bottom of the third conveying roller (203). S3. Drive the first conveying roller (201), the second conveying roller (202) and the third conveying roller (203) to rotate through the power component, and use the spring (207) to push the first support seat (204) so ​​that the first pressure roller (205) cooperates with the corresponding conveying roller to roll and convey the three films respectively. Subsequently, guided and supported by multiple sets of guide rollers (208), the three films are conveyed to the coating assembly and the pressing assembly; S4. Apply solvent-free adhesive to the surfaces of the second and third films respectively using the coating assembly; S5. The first film and the second film are conveyed between the first forming roller (302) and the second forming roller (304) of the first group, heated by the electric heating jacket (306) and rolled together to form the first composite film; S6. The first composite film and the third film are conveyed to the second group between the first forming roller (302) and the second forming roller (304), and heated and rolled together by the electric heating jacket (306) to form a three-layer composite film. S7. After the three sets of take-up rollers (106) on the right side have finished unwinding, the support arm (102) is driven to rotate by the drive device to exchange the positions of the take-up rollers (106) on the left and right sides, so that the full-load take-up roller (106) that has been replaced on the right side can continue to unwind, while the empty take-up roller (106) that has been exchanged to the left side is disassembled and replaced with a new full-load take-up roller (106), so as to achieve parallel operation of the process.

9. The solvent-free lamination method for high-temperature retort pouches as described in claim 8, characterized in that, In S3, the first support seat (204) is attracted by the electromagnet (601) and the first pressure roller (205) is separated from the corresponding conveying roller so that the film can be inserted. After the power is cut off, the spring (207) resets and presses it.

10. The solvent-free lamination method for high-temperature retort pouches as described in claim 8, characterized in that, In S7, when the support arm (102) rotates, the third gear (502) is driven by the second power motor (503) to mesh with the second gear (501) for transmission. After rotating into position, the brake caliper (505) clamps the brake disc (504) to achieve locking and positioning.

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