An ink drying device for a letterpress printing machine

Abstract

The application relates to an ink drying device of a letterpress printing machine, which comprises a sealed preheating channel arranged at the bottom of an ink storage cylinder, and an air inlet pipe and an air outlet pipe arranged on the ink storage cylinder and communicated with the preheating channel; a microwave generating device is arranged in a hard plastic bin of a drying assembly; the hard plastic bin is a sealed part, and a through groove is arranged for the passing of printed pieces; the microwave generating device is arranged in the hard plastic bin, and the microwaves generated by the microwave generating device can quickly and comprehensively dry the water-based ink from inside to outside, and cannot cause the false dry and sticky phenomenon; in addition, the generated excessive heat is sent into the preheating channel of the ink storage cylinder through a gas collecting cylinder and an exhaust fan, the water-based ink is preheated, energy recycling is realized, and the utilization rate is improved. In addition, the cabin wall of the hard plastic bin is provided with a heat insulation coating and a heat insulation cover, heat loss is avoided, the excellent heat absorption of the iron material is avoided, and the heat utilization rate is further improved.

Description

Technical Field

[0001] This application relates to the field of printing equipment technology, and in particular to an ink drying device for a letterpress printing machine. Background Technology

[0002] Water-based inks are homogeneous pastes composed of binders, pigments, and additives. The binder provides the necessary transfer properties, while the pigment imparts color. Binders for water-based inks are mainly divided into two types: water-dilutable and water-dispersible. The former can use a variety of resins, such as maleic acid resin, shellac, maleic acid resin-modified shellac, urethane, water-soluble acrylic resin, and water-based amino resin. Water-dispersible binders are obtained through monomer polymerization via emulsification in water. It is a two-phase system, where the oil phase is dispersed in the aqueous phase as particles. Although it cannot be dissolved in water, it can be diluted with water; therefore, it can also be considered an oil-in-water emulsion.

[0003] In existing technologies, after letterpress printing, the ink on the printed areas needs to be dried. Ink drying methods generally include hot air and electric heating, both of which are external heating methods. The ink surface first absorbs heat, which is then conducted into the ink layer before drying. This process can easily cause a sealed film to form on the surface, preventing the solvent from escaping and slowing down the drying process. In summer, this can easily lead to a false-drying and sticky phenomenon. Furthermore, the heat generated is somewhat wasted. Additionally, during the heating process, the resin or solvent in the ink can volatilize, producing gases harmful to humans and the environment.

[0004] Therefore, it is necessary to propose an ink drying device for letterpress printing machines to solve the above problems. Summary of the Invention

[0005] This application provides an ink drying device for a letterpress printing machine to solve the problems of false drying and stickiness caused by ink heating methods in related technologies, as well as low heat utilization.

[0006] The present invention provides an ink drying device for a letterpress printing machine, comprising:

[0007] An ink storage cylinder contains a rotating impression cylinder; the impression cylinder is used to print on the workpiece to be printed; the bottom of the ink storage cylinder is provided with a sealed preheating channel, and the ink storage cylinder is provided with an air inlet pipe and an air outlet pipe communicating with the preheating channel;

[0008] A drying assembly, comprising a rigid plastic chamber, with heat-insulating covers at both ends of the rigid plastic chamber, and the heat-insulating covers having grooves for the printed workpiece to pass through.

[0009] Two microwave generating devices are located inside the rigid plastic chamber and are respectively connected to the top and bottom walls of the rigid plastic chamber; the space between the two microwave generating devices is for the printed workpiece to pass through.

[0010] An air collecting cylinder is installed on the rigid plastic chamber and communicates with the interior of the rigid plastic chamber; the air collecting cylinder is connected to the air inlet pipe through a pipe, and an exhaust fan is provided inside the air collecting cylinder and the pipe, the exhaust fan being used to send hot air to the preheating channel.

[0011] It also includes a first filter cartridge, a second filter cartridge, a first hose, a second hose, and a third hose. Both the first and second filter cartridges are filled with water, and the water level in both cartridges is half of the maximum water level in the first and second filter cartridges. The first and second filter cartridges are connected by the first hose. One end of the first hose is connected to the top of the first filter cartridge, and the other end is connected to the bottom of the second filter cartridge. One end of the second hose is connected to the air collecting cylinder, and the other end is inserted from the top of the first filter cartridge and extends below the water level. One end of the third hose is connected to the top of the second filter cartridge, and the other end is connected to the air inlet pipe. One-way valves are provided at both ends of the first, second, and third hoses.

[0012] As a further embodiment of the present invention, a temperature sensor is also provided inside the rigid plastic chamber; the exhaust fan is also used to operate at the highest speed when the temperature value detected by the temperature sensor is greater than the set value, and to operate at the normal speed when the temperature value detected by the temperature sensor is less than or equal to the set value.

[0013] As a further embodiment of the present invention, the inner walls on the left and right sides of the rigid plastic chamber are provided with guide plates extending along their length, and the guide plates are provided with guide grooves arranged along the length direction of the rigid plastic chamber. The guide grooves are used to limit the left and right sides of the printed workpiece.

[0014] As a further embodiment of the present invention, the guide groove is provided with guide wheels arranged vertically, and the guide wheels rotate accordingly when the printed workpiece passes between the vertically arranged guide wheels.

[0015] As a further embodiment of the present invention, there are multiple air collection cylinders distributed in the upper and lower parts of the rigid plastic chamber. A movable plate is detachably connected to each air collection cylinder, and an air filter element connected to the movable plate is provided inside the air collection cylinder.

[0016] As a further embodiment of the present invention, the gas collecting cylinder is provided with a connection port, and a connection plane is provided around the connection port. A permanent magnet block is on the connection plane, and the permanent magnet block is attracted and connected to the movable plate.

[0017] As a further embodiment of the present invention, the first filter cartridge and the second filter cartridge are mounted on the outer surface of the rigid plastic chamber or the ink storage cylinder.

[0018] As a further embodiment of the present invention, the exhaust fan includes fan blades and a drive motor, wherein the drive motor is a high-temperature resistant motor.

[0019] As a further embodiment of the present invention, the inner wall of the rigid plastic compartment is provided with a heat-insulating coating, and the guide wheels and guide plates are both made of rigid plastic.

[0020] The beneficial effects of the technical solution provided in this application include:

[0021] (1) In this invention, the rigid plastic chamber is a sealed component with a channel for the printing process parts to pass through; the rigid plastic chamber is equipped with a microwave generator, and the microwave generated by the microwave generator can quickly and comprehensively dry the water-based ink from the inside out, without producing false drying and stickiness. In addition, the excess heat generated is sent to the preheating channel of the ink storage cylinder through the air collecting cylinder and the exhaust fan to preheat the water-based ink, realize energy recovery and utilization, and improve the utilization rate.

[0022] (2) The present invention avoids heat loss and avoids the excellent heat absorption properties of iron materials by setting the inner wall of the rigid plastic container with heat insulation coating and heat insulation cover, thereby further improving the heat utilization rate.

[0023] (3) The present invention has a connection port on the air collection cylinder, a connection plane around the connection port, a permanent magnet on the connection plane, and the permanent magnet is attracted and connected to the movable plate, which facilitates the replacement of the air filter.

[0024] (4) The present invention is provided with a first filter cylinder, a second filter cylinder, a first hose, a second hose and a third hose. The first filter cylinder and the second filter cylinder are both filled with water, and the water level is half of the maximum water level of the first filter cylinder and the second filter cylinder. The first filter cylinder and the second filter cylinder are connected by the first hose. One end of the first hose is connected to the top of the first filter cylinder and the other end is connected to the bottom of the second filter cylinder. One end of the second hose is connected to the gas collection cylinder and the other end is inserted from the top of the first filter cylinder and extends below the water level. One end of the third hose is connected to the top of the second filter cylinder and the other end is connected to the air inlet pipe. In this way, the harmful gases in the rigid plastic chamber can be dissolved in water on the one hand, and heat energy is stored in the first filter cylinder and the second filter cylinder on the other hand, which facilitates the continuous supply of heat energy to the preheating channel. At the same time, the water solubility of the harmful gases increases after the temperature rises, which is more conducive to the recovery of harmful gases. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0026] Figure 1 The overall device of the ink drying apparatus for a letterpress printing machine provided in the embodiments of this application is viewed from a first perspective.

[0027] Figure 2 The overall device of the ink drying apparatus for a letterpress printing machine provided in the embodiments of this application is viewed from a second perspective.

[0028] Figure 3 A third-view view of the overall apparatus of the ink drying device for a letterpress printing press provided in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the structure of the ink storage cylinder provided in the embodiments of this application;

[0030] Figure 5 This is a schematic diagram of the overall structure of the drying assembly provided in the embodiments of this application;

[0031] Figure 6 This is a schematic diagram of the internal structure of the drying assembly provided in an embodiment of this application;

[0032] Figure 7 A schematic diagram illustrating the internal connection between the gas collecting cylinder and the rigid plastic chamber provided in an embodiment of this application;

[0033] Figure 8 A schematic diagram showing the separated state of the heat-insulating cap and the rigid plastic compartment provided in an embodiment of this application;

[0034] Figure 9 This is a schematic diagram showing the connection between the first filter cartridge and the second filter cartridge provided in an embodiment of this application.

[0035] In the diagram: 1. Ink storage cylinder; 2. Impression cylinder; 3. Rigid plastic hopper; 4. Insulated cover; 5. Microwave generator; 6. Preheating channel; 7. Air collection cylinder; 8. Exhaust fan; 9. Guide plate; 10. Movable plate; 11. First filter cylinder; 12. Second filter cylinder; 13. First hose; 14. Second hose; 15. Third hose; 16. Air filter element. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] This application provides an ink drying device for a letterpress printing machine to solve the problems of false drying and stickiness caused by ink heating methods in related technologies, as well as low heat utilization.

[0038] Please see Figure 1 - Figure 9 An ink drying device for a letterpress printing machine, comprising:

[0039] The ink storage cylinder 1 has a rotating impression cylinder 2 inside; the impression cylinder 2 is used to print on the workpiece to be printed; the bottom of the ink storage cylinder 1 is provided with a sealed preheating channel 6, and the ink storage cylinder 1 is provided with an air inlet pipe and an air outlet pipe that are connected to the preheating channel 6.

[0040] The drying assembly includes a rigid plastic chamber 3, with heat-insulating covers 4 at both ends of the rigid plastic chamber 3. The heat-insulating covers 4 have grooves for the printed parts to pass through. The inner wall of the rigid plastic chamber 3 is provided with a heat-insulating coating. Two microwave generators 5 are located inside the rigid plastic chamber 3 and are respectively connected to the top and bottom walls of the rigid plastic chamber 3. The space between the two microwave generators 5 is for the printed parts to pass through.

[0041] The air collecting cylinder 7 is installed on the rigid plastic chamber 3 and is connected to the interior of the rigid plastic chamber 3; the air collecting cylinder 7 is connected to the air inlet pipe through a pipe; an exhaust fan 8 is provided inside the air collecting cylinder 7 or the pipe, and the exhaust fan 8 is used to send hot air to the preheating channel 6.

[0042] Because the rigid plastic container 3 is a sealed component, it has a passageway for the parts to be printed to pass through. A microwave generator 5 is installed inside the rigid plastic container 3. The microwaves generated by the microwave generator 5 can quickly and comprehensively dry the water-based ink from the inside out, preventing false drying and sticking. Excess heat generated is sent to the preheating channel 6 of the ink storage container 1 through the air collector 7 and the exhaust fan 8 to preheat the water-based ink, achieving energy recovery and utilization, and improving efficiency. The exhaust fan 8 includes fan blades and a drive motor, which is a high-temperature resistant motor.

[0043] In addition, the rigid plastic compartment 3 has an insulating coating and an insulating cover 4 inside the compartment wall to avoid heat loss and to avoid the excellent heat absorption properties of iron materials, thereby further improving the heat utilization rate.

[0044] In some preferred embodiments, to improve heat utilization and to determine how to operate when the temperature inside the rigid plastic chamber 3 is too high, the following settings are provided:

[0045] The rigid plastic compartment 3 is also equipped with a temperature sensor; the exhaust fan 8 is also used to operate at the highest speed when the temperature value detected by the temperature sensor is greater than the set value, and to operate at the normal speed when the temperature value detected by the temperature sensor is less than or equal to the set value.

[0046] The above settings ensure that the temperature is always maintained at a suitable drying temperature. If the temperature does not change after the exhaust fan 8 is running at its highest speed, the power of the microwave generator 5 can be reduced accordingly.

[0047] In some preferred embodiments, the following features are provided to facilitate the smooth entry and exit of printed parts from the drying assembly:

[0048] The rigid plastic chamber 3 has guide plates 9 extending along its length on the inner walls of its left and right sides. Guide grooves, also extending along the length of the rigid plastic chamber 3, are provided within the guide plates 9. These guide grooves are used to limit the left and right sides of the printed workpiece to be printed. Vertically arranged guide wheels are located within the guide grooves. As the printed workpiece passes between these guide wheels, they rotate. Both the guide wheels and the guide plates 9 are made of rigid plastic. Rigid plastic does not absorb heat as quickly as iron, and therefore does not pose any safety hazards.

[0049] In some preferred embodiments, the following settings are implemented to address the problem that the resin or solvent in the ink may volatilize and generate gases harmful to humans or the environment during the heating process:

[0050] There are multiple air collection cylinders 7, which are distributed on the upper and lower parts of the rigid plastic chamber 3; a movable plate 10 is detachably connected to the air collection cylinder 7, and an air filter element 16 connected to the movable plate 10 is provided inside the air collection cylinder 7.

[0051] To facilitate the replacement of the air filter element 16, the air collection cylinder 7 is provided with a connection port, and a connection plane is provided around the connection port. A permanent magnet block is on the connection plane, and the permanent magnet block is attracted and connected to the movable plate 10.

[0052] Of course, to further filter the air and take advantage of the fact that most harmful gases are soluble in water, there are further solutions, please refer to the following explanation:

[0053] It also includes a first filter cylinder 11, a second filter cylinder 12, a first hose 13, a second hose 14, and a third hose 15; both the first filter cylinder 11 and the second filter cylinder 12 are filled with water, and the water level in both is half of the maximum water level in the first filter cylinder 11 and the second filter cylinder 12.

[0054] The first filter cartridge 11 and the second filter cartridge 12 are connected by a first flexible hose 13. One end of the first flexible hose 13 is connected to the top of the first filter cartridge 11, and the other end is connected to the bottom of the second filter cartridge 12. One end of the second flexible hose 14 is connected to the air collecting cylinder 7, and the other end is inserted from the top of the first filter cartridge 11 and extends below the liquid level. One end of the third flexible hose 15 is connected to the top of the second filter cartridge 12, and the other end is connected to the air inlet pipe. One-way valves are provided at both ends of the first flexible hose 13, the second flexible hose 14 and the third flexible hose 15 to prevent water backflow.

[0055] Since one end of the second hose 14 is connected to the gas collecting cylinder 7, and the gas collecting cylinder 7 is connected to the air inlet pipe through a pipe, and one end of the third hose 15 is connected to the top of the second filter cylinder 12, and the other end is connected to the air inlet pipe, on the one hand, the harmful gases in the rigid plastic chamber 3 can be dissolved in water, and on the other hand, heat energy is stored in the first filter cylinder 11 and the second filter cylinder 12, which facilitates the continuous supply of heat energy to the preheating channel 6. At the same time, as the temperature rises, the water solubility of the harmful gases increases, which is more conducive to the recovery of harmful gases.

[0056] It should be understood that water-based ink will produce water vapor after drying. Some of this water vapor will be absorbed by the air filter element 16, and the rest will enter the first filter cartridge 11 and the second filter cartridge 12. Therefore, after a certain period of use, the liquid or water in the first filter cartridge 11 and the second filter cartridge 12 needs to be replaced.

[0057] Because the rigid plastic container 3 is a sealed component, it has a passageway for the parts to be printed to pass through. The rigid plastic container 3 is equipped with a microwave generator 5. The microwaves generated by the microwave generator 5 can quickly and comprehensively dry the water-based ink from the inside out, preventing false drying and sticking. Excess heat generated is sent to the preheating channel 6 of the ink storage container 1 through the air collector 7 and exhaust fan 8 to preheat the water-based ink, achieving energy recovery and utilization, and improving efficiency. Furthermore, the rigid plastic container 3 has an insulating coating and an insulating cover 4 inside the container wall to prevent heat loss and mitigate the excellent heat absorption properties of iron materials, further improving heat utilization.

[0058] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An ink drying device for a letterpress printing machine, characterized in that The application relates to a printing device, which comprises the following parts: an ink storage cylinder, which is internally provided with a rotating impression cylinder; the impression cylinder is used for printing on a to-be-printed workpiece; a bottom of the ink storage cylinder is provided with a sealed preheating channel, and the ink storage cylinder is provided with an air inlet pipe and an air outlet pipe which are communicated with the preheating channel; a drying assembly, which comprises a hard plastic bin, two ends of the hard plastic bin are provided with heat-insulating covers, the heat-insulating covers are provided with through grooves for the to-be-printed workpiece after printing to pass through; two microwave generating devices, which are located in the hard plastic bin and are respectively connected with top and bottom walls of the hard plastic bin; a space between the two microwave generating devices is used for the to-be-printed workpiece after printing to pass through; a gas collecting cylinder, which is installed on the hard plastic bin and is communicated with the inside of the hard plastic bin; the gas collecting cylinder is communicated with the air inlet pipe through a pipeline, and the gas collecting cylinder and the pipeline are provided with an exhaust fan; the device further comprises a first filter cylinder, a second filter cylinder, a first hose, a second hose and a third hose, the first filter cylinder and the second filter cylinder are both filled with water, the liquid level of the water is half of the maximum liquid level of the first filter cylinder and the second filter cylinder, the first filter cylinder and the second filter cylinder are communicated through the first hose, one end of the first hose is communicated with the top of the first filter cylinder, the other end is communicated with the bottom of the second filter cylinder, one end of the second hose is communicated with the gas collecting cylinder, the other end is inserted into the first filter cylinder from the top and extends below the liquid level, one end of the third hose is communicated with the top of the second filter cylinder, the other end is communicated with the air inlet pipe, the two ends of the first hose, the second hose and the third hose are all provided with one-way valves, the exhaust fan is used for sending hot air to the preheating channel and storing heat energy in the first filter cylinder and the second filter cylinder, after the temperature is increased, the water solubility of harmful gas is improved; the number of the gas collecting cylinders is plural, the gas collecting cylinders are distributed on the upper part and the lower part of the hard plastic bin, detachable connecting plates are detachably connected to the gas collecting cylinders, air filters are arranged in the gas collecting cylinders and connected with the connecting plates; the gas collecting cylinders are provided with connecting openings, the periphery of the connecting openings is provided with connecting planes, the connecting planes are provided with permanent magnets, and the permanent magnets are connected with the connecting plates through adsorption; the hard plastic bin is further provided with a temperature sensor, the exhaust fan is used for running at the highest speed when the temperature value detected by the temperature sensor is greater than a set value, the exhaust fan is used for running at a normal speed when the temperature value detected by the temperature sensor is less than or equal to the set value, and the power of the microwave generating device is reduced if the temperature does not change after the exhaust fan runs at the highest speed; the inner walls on the left and right sides of the hard plastic bin are provided with guide plates which extend along the length of the hard plastic bin, guide grooves which extend along the length of the hard plastic bin are arranged in the guide plates, and the guide grooves are used for limiting the left and right sides of the to-be-printed workpiece after printing; guide wheels which are arranged in an up-down mode are arranged in the guide grooves, and the guide wheels rotate when the to-be-printed workpiece after printing passes between the guide wheels arranged in the up-down mode; the cabin wall of the hard plastic bin is provided with a heat-insulating coating, and the guide wheels and the guide plates are made of hard plastic.

2. An ink drying device for an letterpress printing machine according to claim 1, characterized in that: The first filter cylinder and the second filter cylinder are installed on the hard plastic bin or the outer surface of the ink storage cylinder.

3. An ink drying device for an letterpress printing machine according to claim 1, characterized in that: The exhaust fan comprises fan blades and a driving motor, and the driving motor is a high-temperature-resistant motor.

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