A drying device for a high-speed rotary printing press

Abstract

The utility model discloses a kind of drying device for high-speed rotary printing machine, including the box body being set along the running direction of printing material, drying cavity is arranged in the box body, infrared radiation drying unit is sequentially arranged in the running path of printing material in the drying cavity, it includes several parallelly arranged shortwave infrared heating tube, the printing surface of printing material is set opposite to the shortwave infrared heating tube;Hot air impact drying unit, located downstream of the infrared radiation drying unit, including hot blast oven and multiple hot air nozzles communicated with hot blast oven, the printing surface of printing material is aimed at by the hot air nozzle. In conclusion, the utility model is through infrared radiation and hot air impact in function on timing division of labour and efficiency complement, and with negative pressure adsorption as the basis guarantee of high-speed stable operation, then supplemented by hot air circulation realizes energy saving and environmental protection, jointly constitute a complete, efficient, applicable modern high-speed rotary printing drying solution, with higher social use value and application prospect.

Description

Technical Field

[0001] This utility model relates to the field of drying technology, and in particular to a drying device for a high-speed rotary printing press. Background Technology

[0002] Rotary printing presses, characterized by their high efficiency and speed, are widely used in high-volume printing fields such as newspapers, books, and packaging. During the printing process, the ink needs to dry quickly to fix the image and text, preventing problems such as smudging and ink smudging in subsequent processes. For high-speed rotary printing presses, higher requirements are placed on the drying efficiency and effectiveness of the drying equipment.

[0003] Existing drying equipment mostly uses electric heating elements or gas to directly heat the air, and then blows the hot air onto the surface of the printing material using a fan. This method has the following drawbacks:

[0004] (1) Low thermal energy utilization: Some heat is lost to the surrounding environment with the hot air, resulting in high energy consumption;

[0005] (2) Uneven drying: Hot air is prone to generating eddies and dead corners during the blowing process, resulting in uneven heating of the substrate surface and affecting the printing quality.

[0006] (3) Slow response speed: Traditional heating methods heat up slowly, making it difficult to quickly adjust the drying power according to changes in printing speed.

[0007] Therefore, there is an urgent need for a high-speed rotary printing drying device that can improve thermal energy utilization, ensure drying uniformity, and have a fast response speed. Utility Model Content

[0008] In order to solve the problems mentioned in the background art, the present invention provides a drying device for a high-speed rotary printing press.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A drying device for a high-speed rotary printing press includes a housing arranged along the running direction of the printing substrate, a drying chamber disposed within the housing, and the following components arranged sequentially along the running path of the printing substrate within the drying chamber:

[0011] An infrared radiation drying unit includes several parallel short-wave infrared heating tubes, which are positioned facing the printing surface of the substrate.

[0012] A hot air impact drying unit, located downstream of the infrared radiation drying unit, includes a hot air box and multiple hot air nozzles connected to the hot air box, the hot air nozzles being aligned with the printing surface of the substrate.

[0013] The negative pressure adsorption mechanism is located inside the drying chamber on the non-printing side of the substrate. It includes a negative pressure chamber and multiple adsorption holes formed on the negative pressure chamber. The negative pressure chamber is connected to an exhaust fan through a pipe.

[0014] Preferably, the hot air impact drying unit is connected to a hot air circulation system, which includes an air inlet pipe, an air outlet pipe, a fan, and a heater.

[0015] Preferably, the air outlet duct of the hot air circulation system is connected to an air purifier.

[0016] Preferably, the hot air nozzle is a slit nozzle.

[0017] Preferably, the short-wave infrared heating tube is covered with a quartz glass protective cover.

[0018] Preferably, it also includes a control system, which is electrically connected to the fan and heater of the infrared radiation drying unit and the hot air impact drying unit.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. A combined drying solution of "infrared radiation + hot air impact" is adopted. Infrared radiation can instantly penetrate the ink, causing it to heat up simultaneously inside and out, rapidly evaporating most of the solvent; the subsequent hot air impact is responsible for removing the surface solvent vapor and replenishing the heat. This combination method has a clear division of labor, greatly shortening the drying time, and the hot air circulation system recovers waste heat, significantly reducing energy consumption.

[0021] 2. Infrared radiation itself is uniform, and combined with the slit-type hot air nozzles that form a planar air curtain, it ensures that the printing material is heated evenly across the entire width. The negative pressure adsorption mechanism keeps the paper flat and stable, avoiding changes in drying distance caused by material vibration, further ensuring drying uniformity and improving printing quality.

[0022] 3. The short-wave infrared heating tube starts and stops with almost no delay, and the hot air system can also quickly adjust the airflow via a variable frequency fan. The control system can precisely adjust the power of each unit according to the real-time printing speed, making it highly adaptable.

[0023] 4. The air purifier in the hot air circulation system effectively reduces the emission of volatile organic compounds (VOCs), meeting environmental protection requirements. At the same time, negative pressure adsorption avoids the risk of paper being entangled in the equipment due to heat deformation, improving operational safety.

[0024] In summary, this utility model achieves a complete, efficient drying solution suitable for modern high-speed rotary printing by combining the sequential division of labor and complementary efficiency of infrared radiation and hot air impact, using negative pressure adsorption as the basic guarantee for high-speed and stable operation, and supplementing it with hot air circulation to achieve energy saving and environmental protection. It has high social value and application prospects. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0028] Figure 3 This is a cross-sectional view of the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of the box of this utility model.

[0030] In the diagram: 1-box body, 2-drying chamber, 3-printing substrate, 31-printing surface, 4-infrared radiation drying unit, 41-shortwave infrared heating tube, 42-quartz glass protective cover, 5-hot air impact drying unit, 51-hot air box, 52-hot air nozzle, 53-hot air circulation system, 531-fan, 532-heater, 533-air purifier, 6-negative pressure adsorption mechanism, 61-negative pressure box, 611-negative pressure chamber, 62-adsorption hole, 63-exhaust fan. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Example 1

[0033] Reference Figure 1-4 A high-speed rotary printing drying apparatus includes a sealed housing 1, within which a drying chamber 2 is formed. Printing substrate 3 (such as paper) enters the drying chamber 2 through an inlet and exits through an outlet.

[0034] Inside the drying chamber 2, an infrared radiation drying unit 4 and a hot air impact drying unit 5 are arranged sequentially along the running direction of the printing substrate 3. The infrared radiation drying unit 4 consists of multiple parallel short-wave infrared heating tubes 41, covered by a quartz glass protective cover 42, which face the printing surface 31 of the printing substrate 3. When the printing substrate 3 passes by, the infrared radiation energy instantly acts on the undried ink, causing it to heat up rapidly.

[0035] The hot air impact drying unit 5 is located after the infrared radiation unit and includes a hot air box 51 and multiple slit-type hot air nozzles 52 connected to it. The hot air circulation system 53 includes a fan 531, a heater 532, and an air purifier 533. The fan 531 draws air out of the drying chamber 2, filters out ink particles and solvent vapors through the air purifier 533, heats it by the heater 532, and finally sends it into the hot air box 51. The hot air is then blown from the hot air nozzles 52 in a uniform air curtain onto the printing surface 31 of the printing material 3, carrying away residual solvent and replenishing heat.

[0036] A negative pressure adsorption mechanism 6 is provided on the non-printing side of the printing substrate 3. This mechanism includes a negative pressure box 61, within which a negative pressure cavity 611 is formed. Multiple adsorption holes 62 are formed on the surface of the negative pressure box 61. The negative pressure cavity 61 is connected to an exhaust fan 63 via a pipe. During operation, the exhaust fan 63 creates negative pressure within the negative pressure cavity 61, which slightly adsorbs the printing substrate 3 through the adsorption holes 62, ensuring it remains flat and stable throughout the drying process.

[0037] The control system is electrically connected to the fan 531 and heater 532 of the infrared radiation drying unit 4 and the hot air impact drying unit 5.

[0038] Working principle: The printed substrate, with wet ink on its surface, is pulled by the main drive system of the printing press and first enters the infrared radiation drying unit 4 of the drying device. This unit consists of multiple sets of short-wave infrared heating tubes 41, which emit high-intensity infrared rays that can instantly penetrate the ink layer, causing the resin, solvent, and surface molecules of the substrate inside the ink to simultaneously and uniformly absorb energy and vibrate violently, resulting in a rapid temperature increase in a very short time.

[0039] The printing substrate, after infrared pre-baking, then enters the hot air impact drying unit 5. The unit's slit-type hot air nozzles 52 spray a uniform, continuous planar hot air curtain downwards, completely covering the entire width of the printing substrate. Through convection, the solvent vapors that have vaporized and diffused on the material surface after infrared heating are rapidly blown away and carried away, breaking the vapor saturation layer on the material surface and creating favorable conditions for the continuous evaporation of the internal solvent, greatly accelerating the drying rate.

[0040] Throughout the drying process, the negative pressure adsorption mechanism 6, located on the non-printing side of the substrate, operates continuously. The exhaust fan 63 creates a stable negative pressure within the negative pressure chamber, causing the substrate to be gently and evenly adsorbed onto the mechanism surface through dense adsorption pores. This eliminates any shaking, drifting, or wrinkling of the substrate during high-speed operation, ensuring absolute flatness.

[0041] The hot air impact drying unit 5 is connected to a closed hot air circulation system 53. The mixture of hot air blown onto the material and solvent vapor blown away is drawn by the fan 531 and filtered by the air purifier 533 to remove ink particles and solvent volatiles.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A drying device for a high-speed rotary printing press, characterized in that, The device includes a housing (1) arranged along the running direction of the printing substrate (3), and a drying chamber (2) is provided inside the housing (1). Within the drying chamber (2), along the running path of the printing substrate (3), the following components are sequentially arranged: The infrared radiation drying unit (4) includes several parallel short-wave infrared heating tubes (41), which are positioned facing the printing surface (31) of the substrate (3). The hot air impact drying unit (5), located downstream of the infrared radiation drying unit (4), includes a hot air box (51) and a plurality of hot air nozzles (52) connected to the hot air box (51), the hot air nozzles (52) being aligned with the printing surface (31) of the substrate (3). The negative pressure adsorption mechanism (6) is located in the drying chamber (2) on the non-printing side of the printing material (3), and includes a negative pressure chamber (61) and a plurality of adsorption holes (62) opened on the negative pressure chamber (61). The negative pressure chamber (61) is connected to the exhaust fan (63) through a pipe.

2. The drying device for a high-speed rotary printing press according to claim 1, characterized in that: The hot air impact drying unit (5) is connected to a hot air circulation system (53), which includes an air inlet pipe, an air outlet pipe, a fan (531), and a heater (532).

3. A drying device for a high-speed rotary printing press according to claim 2, characterized in that: The air outlet pipe of the hot air circulation system (53) is connected to an air purifier (533).

4. A drying device for a high-speed rotary printing press according to claim 3, characterized in that: The hot air nozzle (52) is a slit nozzle.

5. A drying device for a high-speed rotary printing press according to claim 1, characterized in that: The short-wave infrared heating tube (41) is covered with a quartz glass protective cover (42).

6. A drying device for a high-speed rotary printing press according to claim 5, characterized in that: It also includes a control system, which is electrically connected to the fan (531) and heater (532) of the infrared radiation drying unit (4) and the hot air impact drying unit (5).

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