Drying device for printed plastic film

Abstract

The invention discloses a drying device for a plastic film after printing, and belongs to the technical field of film printing drying. Comprising a main box body, the front side of the main box body is provided with a box door, the bottom of the main box body is provided with a film flowing opening for a film to enter and exit, a turning guide roller is arranged in the main box body and used for prolonging the walking distance of the film in the main box body, hot air plates are arranged on the inner walls of the main box body and the box door, and a circulating air box is arranged at the top of the main box body. And an expanding device is also arranged in the main box body. According to the drying device, under the cooperation of the multiple turning guide rollers, the hot air plate and the circulating air box, the integrated design of the drying oven is achieved, the size of traditional drying equipment is optimized, meanwhile, the walking distance of a thin film in the drying oven is prolonged, the drying effect on the thin film is improved, and the drying device can be suitable for drying of printing ink of different models and is high in practicability. And heat circulation can be achieved in the box body, the drying efficiency is high, meanwhile, the film can be expanded and flattened, and the purpose of wrinkle-free drying after film printing is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of film printing and drying, in particular to a device for drying plastic films after printing. Background Art

[0002] As people's living standards improve and their material and spiritual needs improve, food and goods are packaged in exquisite ways. Plastic bags are increasingly being printed with colorful information labels to attract customers' attention. Existing printing methods for plastic bags typically involve printing patterns onto plastic strips using an ink printing roller. The printed bags are then dried and rolled up for packaging.

[0003] Polyamide ink is commonly used in printing. This type of ink evaporates quickly and can be quickly dried by a hot air blower, resulting in high printing efficiency. However, it has the disadvantage of being highly toxic. Therefore, for safety and environmental protection, water-based ink, which is pollution-free and low-cost, has become the preferred ink for plastic film coating printing. However, its volatility is low and its drying speed is much slower than that of polyamide ink. After printing, it usually requires longer drying equipment (such as a drying box) to dry it, resulting in a large equipment footprint and inconvenient operation.

[0004] At present, the plastic film color printing drying boxes on the market are all split designs, with large hot air loss, and have disadvantages such as low energy saving, inconvenient installation, and large space occupation. As for the use of water-based inks, the existing color printing drying boxes have disadvantages such as poor drying effect, adhesion of color printing patterns, slow drying speed, etc., resulting in low work efficiency.

[0005] To this end, we designed and developed a new type of drying equipment. By designing multiple sets of guide rollers in the drying box, the walking distance of the film in the drying box is increased to improve the drying time of the film, solving the problem of color printing patterns sticking to the rollers. At the same time, an integrated design is adopted to avoid the problem of large floor space occupied by the drying equipment, and internal heat circulation can be achieved, solving the problem of large hot air loss and high drying efficiency. Summary of the Invention

[0006] The object of the present invention is to provide a device for drying plastic films after printing, so as to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A device for drying plastic film after printing, comprising a main box body, a box door being provided on the front side of the main box body, a film flow port for film entry and exit being provided at the bottom of the main box body, a plurality of corresponding change-guide rollers being provided on the upper and lower sides of the main box body for extending the travel distance of the film in the main box body, hot air plates for discharging hot air being provided on the inner walls of the main box body and the box door, a circulating air box being provided on the top of the main box body for allowing the hot air in the main box body to flow upward and then return to the hot air plates, and an expansion device being provided in the main box body.

[0008] As a further preferred embodiment of the present invention, the vertical spacing between the direction-changing guide rollers is adjustable.

[0009] As a further preferred solution of the present invention: sliding grooves are opened on the inner walls on both sides of the main box body, two slides are slidingly set in each sliding groove, the changeable guide rollers on the upper and lower sides are rotatably set on the slides on the upper and lower sides, and a plurality of positioning holes are opened on the front side of the sliding groove, and the positioning holes are threadedly connected with positioning bolts that pass through the positioning holes and press the slides.

[0010] As a further preferred embodiment of the present invention: the hot air plate includes an inner hot air plate fixedly arranged on the inner wall of the main box body and a front hot air plate arranged on the inner wall of the box door, the inner hot air plate and the front hot air plate are both provided with a hot air cavity and a heat-insulating cavity, an electric heating rod is provided in the hot air cavity, a mesh hot air outlet is provided on the front side of the hot air cavity, a power supply electrically connected to the electric heating rod is provided in the heat-insulating cavity, and the top of the inner hot air plate and the front hot air plate are respectively provided with a rear air inlet and a front air inlet which are communicated with the hot air cavity and the air outlet of the circulating air box.

[0011] As a further preferred solution of the present invention: two return air outlets located in the main box body are correspondingly opened on both sides of the lower end of the circulating air box, and the first fan and the second fan are respectively provided on the left and right sides of the circulating air box. The air inlets of the first fan and the second fan are respectively communicated with the return air outlets on both sides, the air outlet of the first fan is connected to the rear air inlet, and a front air outlet connected to the air outlet of the second fan is opened on the front side of the circulating air box, and the front air outlet is communicated with the front air inlet.

[0012] As a further preferred embodiment of the present invention, the expansion device includes an expansion roller rotatably arranged on the lower slide.

[0013] As a further preferred solution of the present invention: two expanding rollers are provided, which are used to guide and expand the film entering the main box and leaving the main box respectively.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By arranging multiple corresponding guide rollers on the upper and lower sides of the main box, the moving time and distance of a unit length of film in a certain volume of the main box can be increased. With the cooperation of the hot air plate, the drying time of the film is increased, the drying effect is effectively improved, and the problem of sticking of color printing patterns is solved. In addition, the integrated design of the box avoids the problem of excessive size of the drying equipment. By designing the vertical spacing of the upper and lower guide rollers to be adjustable, the spacing between the upper and lower guide rollers can be adjusted according to needs to adjust the movement time of the unit film in the box, which is suitable for drying different types of inks and improves flexibility; By designing hot air plates on the main box body and the inner wall of the box door, the film can be fully dried. At the same time, by setting a circulating air box on the top, the hot air is circulated and repeatedly heated, which improves the drying efficiency of the film. By designing the expanding roller, the film can be expanded to avoid wrinkles when the film moves, ensuring the winding quality of the film after drying and achieving the purpose of wrinkle-free drying of the film surface.

[0015] In summary, the drying device, with the cooperation of multiple direction-changing guide rollers, hot air plates and circulating air boxes, realizes an integrated oven design, optimizes the volume of traditional drying equipment, and at the same time extends the walking distance of the film in the oven, improves the drying effect of the film, and can be applied to the drying of different types of inks, and can realize heat circulation inside the box, with high drying efficiency. At the same time, it can play a role in expanding and flattening the film, so as to achieve the purpose of wrinkle-free drying of the film after printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the device for drying plastic film after printing according to the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the post-printing drying device for plastic film of the present invention, without showing the guide roller; Figure 3 This is a schematic diagram of the structure of the circulating air box in the drying device for post-printing plastic film of the present invention; Figure 4 This is a schematic structural diagram of the front hot air plate of the post-printing drying device for plastic film of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the upper and lower direction-changing guide rollers of the post-printing drying device for plastic film of the present invention; Figure 6 Schematic diagram of the movement direction of the film on the changing guide roller in the drying device for plastic film after printing of the present invention Figure 1 ; Figure 7 Schematic diagram of the movement direction of the film on the changing guide roller in the drying device for plastic film after printing of the present invention Figure 2 .

[0017] In the figure: 1. Main box body; 2. Circulating air box; 3. Direction guide roller; 4. Inner hot air plate; 5. Expanding roller; 6. Front air outlet; 7. Slide plate; 8. Slide groove; 9. Positioning hole; 10. Box door; 11. Front hot air plate; 12. Mesh hot air outlet; 13. Front air inlet; 14. Return air outlet; 15. First fan; 16. Second fan; 17. Rear air inlet; 18. Hot air chamber; 19. Electric heating rod; 20. Insulation chamber; 21. Power supply; 22. Film flow port. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0019] See also Figure 1-6 The present embodiment provides a post-printing drying device for plastic film, comprising a main box body 1, a box door 10 being provided on the front side of the main box body 1, a film flow port 22 for film entry and exit being provided at the bottom of the main box body 1, a plurality of corresponding change-direction guide rollers 3 being provided on both upper and lower sides of the main box body 1 for extending the travel distance of the film in the main box body 1, and specifically, in order for the device to be applicable to inks with different drying times, the vertical spacing between the change-direction guide rollers 3 is designed to be adjustable. Specifically, a slide groove 8 is provided on the inner wall on both sides of the main box body 1, and two slide plates 7 are respectively provided for sliding in each slide groove 8, and the change-direction guide rollers 3 on the upper and lower sides are respectively rotatably provided on the slide plates 7 on the upper and lower sides. In order to realize the positioning and fixation of the slide plates 7, as a conventional design familiar to those skilled in the art, in the present embodiment, preferably, a plurality of positioning holes 9 are provided on the front side of the slide groove 8, and the positioning holes 9 are internally threaded with positioning bolts that pass through the positioning holes 9 and press the slide plates 7. It should be noted that in actual application, the height adjustment device of the slide 7 should be a conventional design familiar to technical personnel in this field, and the existing guide rails, screws and other general component structures can also be used to replace the slide 8 in this application. This is a mature technology and will not be described in detail.

[0020] In order to heat the film in the box and circulate the hot air, hot air plates for discharging hot air are provided on the inner walls of the main box 1 and the door 10. A circulating air box 2 is provided on the top of the main box 1 to make the hot air in the main box 1 flow upward and then return to the hot air plates. Figure 1 、 Figure 2 as well as Figure 4As shown, the hot air plate includes an inner hot air plate 4 fixedly mounted on the inner wall of the main box body 1 and a front hot air plate 11 mounted on the inner wall of the box door 10. The inner hot air plate 4 and the front hot air plate 11 are both provided with a hot air cavity 18 and a heat insulation cavity 20. The hot air cavity 18 is provided with an electric heating rod 19. The front side of the hot air cavity 18 is provided with a mesh hot air outlet 12. The heat insulation cavity 20 is provided with a power supply 21 electrically connected to the electric heating rod 19. The tops of the inner hot air plate 4 and the front hot air plate 11 are respectively provided with a rear air inlet 17 and a front air inlet 13 that communicate with the hot air cavity 18 and the air outlet of the circulating air box 2. Figure 2 and Figure 3 As shown, two return air vents 14 located in the main box body 1 are provided on both sides of the lower end of the circulating air box 2, and a first fan 15 and a second fan 16 are provided on the left and right sides of the circulating air box 2 respectively. The air inlets of the first fan 15 and the second fan 16 are respectively communicated with the return air vents 14 on both sides, and the air outlet of the first fan 15 is connected to the rear air inlet 17. A front air outlet 6 connected to the air outlet of the second fan 16 is provided on the front side of the circulating air box 2, and the front air outlet 6 is communicated with the front air inlet 13.

[0021] In addition, in order to avoid wrinkles in the film when it moves, e.g. Figure 5 as well as Figure 6 As shown, an expansion device is also provided in the main box 1. Specifically, the expansion device is an expansion roller 5. The expansion roller 5 is rotatably provided on the lower slide 7. Preferably, as shown in FIG. Figure 6 As shown, there are two expanding rollers 5, which guide and expand the film when it flows in and out. On the one hand, it can expand the film in the box to improve the drying effect, and on the other hand, it also ensures the winding quality of the film after drying. In actual application, according to the needs, such as Figure 7 As shown, the number of the direction-changing guide rollers 3 and the width-expanding rollers 5 can also be designed to be multiple, and this application does not limit the number. The order of winding the film around the rollers is a conventional setting made by technical personnel in this field according to the number of guide rollers, and this application will not go into details.

[0022] In order to enable those skilled in the art to better understand the present application, the working principle of the drying device will be described in detail below: Reference Figure 1-6 As shown, in actual application, Figure 1 The door 10 in the box is in a closed state, and the front air inlet 13 is just inserted into the front air outlet 6 to connect the two; the film after coating and printing enters the main box body 1 through the film flow port 22 at the bottom. In this embodiment, five guide rollers are respectively provided on the upper and lower sides. The direction of the film is as follows Figure 6As shown, the film finally leaves the main box body 1 through the film flow port 22 at the bottom. The flow of the film is powered by an external winding roller. During drying, the first fan 15 and the second fan in the circulating air box 2 work, and the power supply 21 works at the same time to heat the electric heating rod 19. The fan makes the wind in the main box body 1 flow upward through the return air port 14, flows into the hot air plate after passing through the circulating air box 2, and returns to the main box body 1 after being heated, realizing the reciprocating recycling of hot air and heating and drying of the film.

[0023] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and technical features of the present application. For those skilled in the art, solutions or features that belong to the prior art or common knowledge will not be described in detail in the above embodiments.

[0024] In addition, the technical solutions of the present application are not limited to the above-mentioned embodiments. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A post-printing drying device for plastic film, comprising a main box (1), a box door (10) provided on the front side of the main box (1), and a film flow port (22) provided on the bottom of the main box (1) for film inlet and outlet, characterized in that: A plurality of corresponding direction-changing guide rollers (3) are provided on both the upper and lower sides of the main box (1) for extending the travel distance of the film in the main box (1). Hot air plates for discharging hot air are provided on the inner walls of the main box (1) and the box door (10). A circulating air box (2) is provided on the top of the main box (1) for allowing the hot air in the main box (1) to flow upward and then return to the hot air plates. An expansion device is also provided in the main box (1).

2. The plastic film post-printing drying device according to claim 1, characterized in that: The vertical spacing between the direction-changing guide rollers (3) is adjustable.

3. The plastic film post-printing drying device according to claim 2, characterized in that: Slide grooves (8) are provided on the inner walls of both sides of the main box body (1), and two slide plates (7) are slidably provided in each slide groove (8). The upper and lower guide rollers (3) are rotatably provided on the upper and lower slide plates (7), respectively. A plurality of positioning holes (9) are provided on the front side of the slide groove (8), and the positioning holes (9) are internally threadedly connected with positioning bolts that penetrate the positioning holes (9) and press the slide plates (7).

4. The plastic film post-printing drying device according to claim 1, characterized in that: The hot air plate comprises an inner hot air plate (4) fixedly arranged on the inner wall of the main box body (1) and a front hot air plate (11) arranged on the inner wall of the box door (10); a hot air cavity (18) and a heat insulation cavity (20) are arranged in the inner hot air plate (4) and the front hot air plate (11); an electric heating rod (19) is arranged in the hot air cavity (18); a mesh hot air outlet (12) is arranged on the front side of the hot air cavity (18); a power supply (21) electrically connected to the electric heating rod (19) is arranged in the heat insulation cavity (20); and a rear air inlet (17) and a front air inlet (13) which are communicated with the hot air cavity (18) and the air outlet of the circulating air box (2) are respectively arranged on the top of the inner hot air plate (4) and the front hot air plate (11).

5. The plastic film post-printing drying device according to claim 4, characterized in that: Two return air ports (14) located in the main box body (1) are provided on both sides of the lower end of the circulating wind box (2), and a first fan (15) and a second fan (16) are provided on the left and right sides of the circulating wind box (2), respectively. The air inlets of the first fan (15) and the second fan (16) are communicated with the return air ports (14) on both sides, respectively. The air outlet of the first fan (15) is connected to the rear air inlet (17), and a front air outlet (6) is provided on the front side of the circulating wind box (2) and is communicated with the air outlet of the second fan (16), and the front air outlet (6) is communicated with the front air inlet (13).

6. The plastic film post-printing drying device according to claim 3, characterized in that: The expansion device comprises an expansion roller (5) rotatably arranged on a slide plate (7) on the lower side.

7. The plastic film drying device after printing according to claim 6, characterized in that: Two expansion rollers (5) are provided, which are used to guide and expand the film entering the main box (1) and leaving the main box (1), respectively.

Images