Inclined blowing type drying oven of gravure press

Abstract

The utility model discloses an inclined blowing type drying oven of a gravure press, which belongs to the technical field of printing machinery and comprises an upper drying oven shell and a lower drying oven shell which are connected with each other and form a box body structure. A drying oven inner container is arranged in the upper drying oven shell, an air inlet is formed in the top of the upper drying oven shell and communicated with the drying oven inner container, and the bottom wall of the drying oven inner container is detachably communicated with a plurality of evenly-arranged air blowing tuyeres. The inner wall of the lower oven shell is rotatably connected with a plurality of uniformly arranged guide rollers, the bottom wall of the lower oven shell is provided with an air outlet, and two corresponding side walls of the lower oven shell are respectively provided with a base material inlet and a base material outlet; the air blowing nozzles and the guide rollers are arranged in the direction from the base material inlet to the base material outlet. According to the utility model, the hot air is not directly irradiated on the surface of the printing stock, so that the technical problem of negative influence on the printing stock caused by concentrated heat input and vertical jet flow is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of printing machinery, and particularly relates to an inclined air-blowing oven for a gravure printing machine. Background Art

[0002] Printing technology is widely used in the fields of food packaging, advertising, book printing, etc. In order to make the printed pattern more vivid and three-dimensional, the gravure printing technology is often used. The core equipment for completing the gravure printing process is usually called a gravure printing machine. The gravure printing machine consists of a winding and unwinding system, a printing system, a drying system, and a tension control system, and each component cooperates with each other to complete production. During the gravure printing process, the ink is printed on various printing substrates, and then dried. The printing substrates are mainly various types of film materials and papers, and the printing substrates are usually also called base materials. The drying system is the key to the drying and film formation of the printing layer and the bonding of the base material. As the main equipment in the drying system, the uniformity of the hot air in the oven cavity directly affects the quality and production rate of the printed products.

[0003] The spatial structure of the oven cavity, such as: the position of the air inlet, the shape and quantity of the guide plates, and the size and shape of the air nozzles, etc., are all important factors affecting the flow field uniformity and drying efficiency. Most of the existing oven air nozzles only have a single air outlet, and the air outlet angle is almost perpendicular or approximately perpendicular to the surface of the printing substrate. The heat input area is highly concentrated. In the case of a relatively thick film material, it will cause slow heat transfer and diffusion, thereby affecting the printing production efficiency. At the same time, the vertical outlet of the oven air nozzle will also form a hot air flow that jets vertically downward at high speed, and the solvent of the printing substrate layer is easily blown to the inside of the film material, resulting in uneven distribution of the solvent on the surface of the printing substrate, affecting the product quality and increasing the manufacturing cost. Content of the Utility Model

[0004] The purpose of the utility model is to provide an inclined air-blowing oven for a gravure printing machine, which solves the technical problems of the negative impacts brought by concentrated heat input and vertical jet flow to the printing substrate.

[0005] The technical solution adopted by the utility model is that the inclined air-blowing oven for a gravure printing machine includes an upper oven housing and a lower oven housing that are connected to each other, and the upper oven housing and the lower oven housing form a box structure;

[0006] An oven inner liner is provided inside the upper oven housing. An air inlet is opened at the top of the upper oven housing, and the air inlet is communicated with the oven inner liner. The bottom wall of the oven inner liner is detachably communicated with a plurality of uniformly arranged blowing air nozzles;

[0007] A plurality of guide rollers are rotatably connected to the inner wall of the lower oven housing. An air outlet is opened at the bottom wall of the lower oven housing, and a substrate inlet and a substrate outlet are respectively opened on two opposite side walls of the lower oven housing;

[0008] A plurality of blowing air nozzles and a plurality of guide rollers are all arranged along the direction from the substrate inlet to the substrate outlet.

[0009] The features of the present utility model also lie in that:

[0010] The inner wall at the top of the oven inner liner is inclined.

[0011] A number of blowing nozzles include two edge inclined blowing nozzles and a number of inner inclined blowing nozzles arranged between the two edge inclined blowing nozzles. The two edge inclined blowing nozzles are arranged close to the lower oven shell.

[0012] The air outlet of the edge inclined blowing nozzle is inclined towards the inner inclined blowing nozzle, and the width of the edge inclined blowing nozzle gradually decreases along the air flow direction.

[0013] The inner inclined blowing nozzle includes a first bending part of the nozzle. The top of the first bending part of the nozzle is connected to the vertical part on the nozzle, the bottom of the first bending part of the nozzle is connected to the lower vertical part of the nozzle. The width of the vertical part on the nozzle is greater than the width of the lower vertical part of the nozzle. The bottom of the lower vertical part of the nozzle is connected to a second bending part of the nozzle. The inner cavity of the lower vertical part of the nozzle is provided with a third bending part of the nozzle. Two air outlets of the nozzle are formed between the lower vertical part of the nozzle and the second bending part of the nozzle. The two air outlets of the nozzle are respectively inclined towards the edge inclined blowing nozzle.

[0014] The widths of the substrate inlet and the substrate outlet are smaller than the width of the inner wall of the lower oven shell. There are two air outlets, and the two air outlets are close to the bottom wall edge of the inner cavity of the lower oven shell. The air outlets are arranged along the direction from the substrate inlet to the substrate outlet.

[0015] The beneficial effects of the present utility model are as follows:

[0016] For the gravure press inclined blowing type oven disclosed by the present utility model, the air inlet is located at the middle position of the upper oven shell, which is beneficial to the uniform diffusion of hot air in the oven inner liner and the transfer to each blowing nozzle; different from other direct blowing ovens, the air outlet of the nozzle of the present utility model forms a certain angle with the printing substrate, and the hot air does not directly irradiate on the surface of the printing substrate, and it is easier to form an active eddy current; except for the two edge inclined blowing nozzles on both sides, the remaining several inner inclined blowing nozzles all have two non - co - directional air outlets, which increases the direct heating area on the surface of the printing substrate and is beneficial to the improvement of the heat and mass transfer coefficient of the printing substrate; since there is a certain distance between the printing substrate and the inner side of the lower oven shell, and the air outlets are symmetrically distributed in the width direction of the lower oven shell, it is beneficial to the exclusion of the solvent vapor formed after drying in the oven and the convective heat transfer. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the gravure press inclined blowing type oven of the present utility model;

[0018] Figure 2 is the structural schematic diagram of the oven inner liner in the gravure press inclined blowing type oven of the present utility model;

[0019] Figure 3 is Figure 1 the front view of;

[0020] Figure 4 is Figure 1 the bottom view of;

[0021] Figure 5 is a schematic structural diagram of the edge inclined blowing nozzle in the inclined blowing oven of the intaglio printing machine of the present utility model;

[0022] Figure 6 is a schematic structural diagram of the internal inclined blowing nozzle in the inclined blowing oven of the intaglio printing machine of the present utility model;

[0023] Figure 7 is Figure 5 the sectional structural diagram of;

[0024] Figure 8 is Figure 6 the sectional structural diagram of;

[0025] Figure 9 is a schematic diagram of air inlet and outlet in the front view direction of the inclined blowing oven of the intaglio printing machine of the present utility model;

[0026] Figure 10 is a schematic diagram of air inlet and outlet in the left view direction of the inclined blowing oven of the intaglio printing machine of the present utility model.

[0027] In the figure, 1. Printed material, 2. Upper oven housing, 3. Air inlet, 4. Lower oven housing, 5. Air outlet, 6. Substrate inlet, 7. Substrate outlet, 8. Oven inner liner, 9. Edge inclined blowing nozzle, 10. Internal inclined blowing nozzle, 11. Guide roller, 12. Nozzle mounting hole, 13. Vertical part of the nozzle, 14. First bending part of the nozzle, 15. Lower vertical part of the nozzle, 16. Second bending part of the nozzle, 17. Nozzle air outlet, 18. Third bending part of the nozzle. Specific embodiments

[0028] The present utility model will be further explained below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1

[0030] As Figure 1 , Figure 2 , Figure 3 shown, the inclined blowing oven of the intaglio printing machine disclosed in this embodiment includes an upper oven housing 2 and a lower oven housing 4 that are connected to each other, and the upper oven housing 2 and the lower oven housing 4 form a box structure;

[0031] Inside the outer shell 2 of the upper oven, an oven inner liner 8 is connected by fasteners. An air inlet 3 is opened at the top of the outer shell 2 of the upper oven, and the air inlet 3 is communicated with the oven inner liner 8. The bottom wall of the oven inner liner 8 is detachably communicated with a number of evenly arranged blowing nozzles. This arrangement can effectively increase the area of direct heat transfer. Specifically, a slot is provided on the bottom wall of the oven inner liner 8, and nozzle mounting holes 12 are provided on both sides of the blowing nozzle. The nozzle mounting holes 12 are connected to the corresponding slots on the bottom wall of the oven inner liner 8 by fasteners. The blowing nozzle is processed by the method of sheet metal bending and welding. The detachable design facilitates the subsequent maintenance of the blowing nozzle. On the premise that the total input air volume is the same, compared with the conventional vertical nozzle oven, the oven proposed by the present utility model can greatly increase the contact area and contact time between the hot air and the printing substrate within the same time. Therefore, it has more advantages in improving the drying uniformity and drying quality of the printing substrate surface.

[0032] The present utility model includes multiple groups of blowing nozzles, which can greatly increase the direct contact area between the printing material film and the hot air blown out by the blowing nozzles on the premise of ensuring the air outlet speed, thereby increasing the heating area, improving the drying efficiency and uniformity, and further improving the quality of printed products.

[0033] As Figure 4 shown, a number of guide rollers 11 are rotatably connected to the inner wall of the lower oven outer shell 4, and an air outlet 5 is opened at the bottom wall of the lower oven outer shell 4. On the two opposite side walls of the lower oven outer shell 4, that is, on the left and right side walls, a substrate inlet 6 and a substrate outlet 7 are respectively opened;

[0034] A number of blowing nozzles and a number of guide rollers 11 are all arranged along the direction from the substrate inlet 6 to the substrate outlet 7. The printing substrate 1 enters the inside of the box from the substrate inlet 6 and is transmitted to the substrate outlet 7 on the guide rollers 11. When the moving direction of the printing substrate 1 is different, the positional relationship between the substrate inlet 6 and the substrate outlet 7 is interchanged, and there is no essential difference between the two.

[0035] The air inlet 3 is located at the middle position of the top of the outer shell 2 of the upper oven. The air inlet 3 is connected to the air inlet pipe and the blower. The air outlets 5 are symmetrically distributed on both sides of the printing substrate 1. The air outlets 5 are connected to the air outlet pipe, the exhaust fan and the waste heat recovery device. The air inlet 3 and the air outlets 5 form a gas flow.

[0036] Furthermore, the inner wall of the top of the oven inner liner 8 is inclined.

[0037] As Figure 2 shown, the inclined plates symmetrically arranged on the left and right sides of the top of the oven inner liner 8 can better diffuse the hot air.

[0038] Embodiment 2

[0039] As Figure 5 、 Figure 6 、 Figure 7 、 Figure 8As shown in the figure, on the basis of Embodiment 1, several blowing nozzles include two edge inclined blowing nozzles 9 and several internal inclined blowing nozzles 10 arranged between the two edge inclined blowing nozzles 9. The two edge inclined blowing nozzles 9 are arranged close to the lower oven housing 4.

[0040] Furthermore, the air outlet of the edge inclined blowing nozzle 9 is inclined towards the internal inclined blowing nozzle 10, and the width of the edge inclined blowing nozzle 9 gradually decreases along the air flow direction.

[0041] The nozzles at both ends, that is, the edge inclined blowing nozzles 9, are narrow in width and blow air only on one side. The air outlet direction of the left edge inclined blowing nozzle 9 is at the lower right, and the air outlet direction of the right edge inclined blowing nozzle 9 at the end is at the lower left. The remaining several internal inclined blowing nozzles 10 are wider in width and each have two symmetrically arranged reverse air blowing ports, which are connected to the oven inner liner 8 and evenly arranged on the lower side. The lengths of the edge inclined blowing nozzles 9 and the internal inclined blowing nozzles 10 are slightly longer than the oven inner liner 8.

[0042] Furthermore, the internal inclined blowing nozzle 10 includes a first nozzle bending portion 14. The top of the first nozzle bending portion 14 is connected to the upper vertical portion 13 of the nozzle, and the bottom of the first nozzle bending portion 14 is connected to the lower vertical portion 15 of the nozzle. The width of the upper vertical portion 13 of the nozzle is greater than the width of the lower vertical portion 15 of the nozzle. The bottom of the lower vertical portion 15 of the nozzle is connected to a second nozzle bending portion 16. The inner cavity of the lower vertical portion 15 of the nozzle is provided with a third nozzle bending portion 18. Two nozzle air outlets 17 are formed between the lower vertical portion 15 of the nozzle and the second nozzle bending portion 16, and the two nozzle air outlets 17 are respectively inclined towards the edge inclined blowing nozzle 9.

[0043] The second nozzle bending portion 16 and the third nozzle bending portion 18 determine the bending degree of the nozzle air outlet 17; the lower vertical portion 15 of the nozzle and the third nozzle bending portion 18 play a role in hot air diversion. The upper vertical portion 13 of the nozzle that guides hot air into the internal inclined blowing nozzle 10 accounts for 1 / 5 of the total height h of the internal inclined blowing nozzle 10, and is connected to the first nozzle bending portion 14 that converges hot air below. The bending angle here is related to the width and height of the internal inclined blowing nozzle 10. The width after bending should be one-half of that at the upper vertical portion 13 of the nozzle, that is, 1 / 2l, and the height accounts for 2 / 5 of the total height h of the internal inclined blowing nozzle 10, and is connected to the lower vertical portion 15 of the nozzle. The lower vertical portion 15 of the nozzle and the third nozzle bending portion 18 play a role in diverting hot air, and are connected to the second nozzle bending portion 16 below. Here, the angle of the air outlet of the nozzle air outlet 17 is determined. The included angle between the perpendicular bisector at the nozzle air outlet 17 and the surface of the printing substrate 1 is between 30° ± 2°. The multi-bending structure can effectively guide the hot air to be evenly and stably transmitted and diverted along the ideal path, and reach the surface of the printing substrate 1 at a certain angle, reducing heat dissipation and improving the heat transfer efficiency.

[0044] The edge inclined blowing nozzle 9 and the internal inclined blowing nozzle 10 of the oven of the present utility model cooperate with each other to form a hot air field near the surface of the printing substrate 1. The two have the following characteristics: On the one hand, compared with the vertical blowing nozzle, the two inclined blowing nozzles of the present utility model cooperate with each other to keep the contact area between the hot air and the printing substrate 1 at a relatively large level. On the other hand, the edge inclined blowing nozzle 9 plays a role in restricting the diffusion of the hot air field, so that the hot air is concentrated as much as possible below the blowing nozzle, reducing the loss and waste of the hot air in the areas near the substrate inlet 6 and the substrate outlet 7.

[0045] The air inlet and outlet conditions of the present utility model are as Figure 9 and Figure 10 shown. The hot air enters the inner cavity 8 of the oven from the air inlet 3, is blown onto the surface of the printing substrate 1 through the edge inclined blowing nozzle 9 and the internal inclined blowing nozzle 10, completes drying, and then is discharged through the air outlets 5 on both sides of the bottom wall of the lower oven housing 4.

[0046] Embodiment 3

[0047] On the basis of Embodiment 1, the widths of the substrate inlet 6 and the substrate outlet 7 are smaller than the width of the inner wall of the lower oven housing 4. There are two air outlets 5, and the two air outlets 5 are close to the bottom wall edge of the inner cavity of the lower oven housing. The air outlets 5 are arranged along the direction from the substrate inlet 6 to the substrate outlet 7.

[0048] The two air outlets 5 are located on both sides of the vertical movement direction of the substrate, symmetrically distributed in the width direction of the lower oven housing, that is, the air outlets 5 are symmetrically distributed at the corresponding positions of the two sides of the printing substrate 1 at the bottom of the lower oven housing 4, which can effectively discharge the organic solvent gas generated during the drying process.

[0049] The using method of the gravure press inclined blowing type oven of the present utility model is as follows:

[0050] Step 1, after the external blower and the exhaust fan are powered on, the hot air is blown into the air inlet 3 in the middle of the upper oven housing 2 through the ventilation duct at a certain speed, and then enters the inner cavity 8 of the oven;

[0051] Step 2, the hot air is evenly diffused in the inner cavity of the inner cavity 8 of the oven under the guiding action of the symmetric inclined plates on both sides of the inner cavity 8 of the oven, and then enters the edge inclined blowing nozzle 9 and the internal inclined blowing nozzle 10 through the inner cavity 8 of the oven;

[0052] Step 3, when the hot air enters the edge inclined blowing nozzle 9 and the internal inclined blowing nozzle 10, the hot air is first guided by the vertical part 13 on the nozzle, and then the hot air is gathered by the guiding of the first bending part 14 of the nozzle. Then, the hot air is secondarily divided by the lower vertical part 15 of the nozzle and the third bending part 18 of the nozzle, and after passing through the second bending part 16, the flow direction of the hot air is changed and blown out from the air outlets 17 on both sides of the nozzle. The hot air reaches the surface of the printing substrate 1 at an angle of about 30°±2° with the printing substrate 1.

[0053] Step 4: The hot air touches the surface of the printing substrate 1 and rebounds to form an active eddy current, resulting in heat and mass transfer with the ink layer. Under the action of the guide roller 11, the coating on the printing substrate 1 is dried. Compared with the vertical blowing nozzle, the edge inclined blowing nozzles 9 and the internal inclined blowing nozzles 10 of the present invention cooperate with each other, enabling the contact area between the hot air and the printing substrate 1 to remain at a relatively large level. At the same time, the edge inclined blowing nozzles 9 on both sides make the effective drying area of the hot air below the nozzles as concentrated as possible, reducing the loss and waste of hot air near the substrate inlet 6 and the substrate outlet 7;

[0054] Step 5: The dried hot air contains a large amount of solvent vapor. If it is not discharged in time, there will be a risk of explosion. The air outlets 5 symmetrically distributed at the bottom of the lower oven housing 4 can solve this problem. The air outlets 5 are externally connected to an exhaust fan, and a negative pressure is formed at the air outlets 5. The hot air containing solvent is discharged from the lower oven housing 4 through the air outlets 5 on both sides under the action of the pressure difference.

Claims

1. Gravure press with inclined air-blowing drying oven, characterized in that, It includes a mutually connected upper oven housing (2) and a lower oven housing (4), and the upper oven housing (2) and the lower oven housing (4) form a box structure; An oven inner liner (8) is provided inside the upper oven housing (2). An air inlet (3) is opened at the top of the upper oven housing (2), and the air inlet (3) is communicated with the oven inner liner (8). A number of evenly arranged blowing nozzles are detachably communicated with the bottom wall of the oven inner liner (8); A number of evenly arranged guide rollers (11) are rotatably connected to the inner wall of the lower oven housing (4). An air outlet (5) is opened at the bottom wall of the lower oven housing (4). A base material inlet (6) and a base material outlet (7) are respectively opened on two opposite side walls of the lower oven housing (4); A number of blowing nozzles and a number of guide rollers (11) are all arranged along the direction from the base material inlet (6) to the base material outlet (7).

2. The gravure press with inclined air blowing oven according to claim 1, characterized in that, The inner wall at the top of the oven inner liner (8) is inclined.

3. The gravure press with inclined air blowing oven according to claim 1, characterized in that, A number of the blowing nozzles include two edge inclined blowing nozzles (9) and a number of inner inclined blowing nozzles (10) arranged between the two edge inclined blowing nozzles (9). The two edge inclined blowing nozzles (9) are arranged close to the lower oven housing (4).

4. The gravure press with inclined air blowing oven according to claim 3, characterized in that The air outlet of the edge inclined blowing nozzle (9) is inclined towards the inner inclined blowing nozzle (10), and the width of the edge inclined blowing nozzle (9) gradually decreases along the air flow direction.

5. The gravure press inclined air-blowing oven according to claim 3, characterized in that, The inner inclined blowing nozzle (10) includes a nozzle first bending part (14). The top of the nozzle first bending part (14) is connected to a nozzle upper vertical part (13), and the bottom of the nozzle first bending part (14) is connected to a nozzle lower vertical part (15). The width of the nozzle upper vertical part (13) is greater than the width of the nozzle lower vertical part (15). The bottom of the nozzle lower vertical part (15) is connected to a nozzle second bending part (16). A nozzle third bending part (18) is arranged in the inner cavity of the nozzle lower vertical part (15). Two nozzle air outlets (17) are formed between the nozzle lower vertical part (15) and the nozzle second bending part (16), and the two nozzle air outlets (17) are respectively inclined towards the edge inclined blowing nozzle (9).

6. The gravure press with inclined air-blowing oven according to claim 1, wherein, The widths of the base material inlet (6) and the base material outlet (7) are smaller than the width of the inner wall of the lower oven housing (4). There are two air outlets (5), and the two air outlets (5) are close to the bottom wall edge of the inner cavity of the lower oven housing. The air outlets (5) are arranged along the direction from the base material inlet (6) to the base material outlet (7).

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