Plastic film printing device

Abstract

The utility model provides a plastic film printing device which comprises a box body, a printing space is arranged in the box body, a feeding port and a discharging port are arranged at two ends of the box body, a rack is arranged between the feeding port and the discharging port in the box body, and guide rollers are respectively arranged on the rack and used for drawing a film. An ink brushing assembly and a printing roller are further sequentially arranged between the two guide rollers in the thin film traction direction, the ink brushing assembly is arranged on the feeding side of a printing thin film of the printing roller and movably arranged on the rack, the printing roller is rotationally connected with the rack, and an ink storage box is further arranged below the printing roller; an adjusting mechanism is further arranged between the guide roller and the printing roller and used for adjusting the tension degree of the film, and an adjusting assembly is further arranged at the position, making contact with the film, of the adjusting mechanism and used for smoothing wrinkles of the film. The utility model solves the problems that the existing printing equipment is compact in structure, so that the working procedures become tedious, and the printing ink of a film printing pattern is not uniformly distributed, so that the subsequent drying needs longer time, and the production efficiency is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of film printing, concretely relates to a plastic film printing device. BACKGROUND

[0002] Plastic packaging bags are essential in daily life, and merchants will print various patterns on packaging bags for publicity.

[0003] Generally, the surface of the plastic film for making plastic bags is printed by using a film printing device. The film printing device generally has an inlet and outlet roller for guiding the displacement and transmission of the plastic film, and then the printing roller is stained with ink and printed on the surface of the plastic film. However, there are some technical problems in this process.

[0004] Generally, when the film for making plastic bags is displaced on the transmission assembly such as the driving roller and the guide roller, due to the installation precision problem and the relatively fast transmission speed, the transmission assembly is prone to jitter and offset. At this time, the surface of the plastic film will wrinkle, and the transmission state will also change, such as the tight transmission state becoming loose. The above-mentioned plastic film transmission problem will affect the printing work of the printing roller on the surface of the film. When the loose and wrinkled plastic film passes through the printing device such as the printing roller, the plastic film at the wrinkled part may overlap, which will make the printed pattern incomplete. The loose plastic film does not have a precise printed pattern in the corresponding area, resulting in a deviation in printing. In the prior art, some wrinkle smoothing devices are used to eliminate wrinkles, or tensioning assemblies are set to control the tension of the film. However, these adjustment methods are relatively single and not integrated, and need to be set at the same time, which increases the structure of the printing device and makes the process complicated. The function is not integrated, which reduces the practicability. In addition, due to the rotation of the printing roller, a part of the excess ink will be brought to the center line area of the printing surface, like the water splashed on the center line area of the surface of the tire of a vehicle driving in the rain. This part of the excess ink will cause uneven distribution of the ink in the center area of the film printing pattern, which will cause the ink in the center area of the film to need longer drying time in the subsequent drying process, reducing the production efficiency.

[0005] In summary, the existing plastic film printing device has the problem that the functions of adjusting the tension of the film and the adjusting device for smoothing wrinkles are not integrated, and need to be set at the same time, which increases the structure of the printing device and makes the process complicated. In addition, there is a problem of uneven distribution of ink in the film printing pattern, which causes the ink in some areas of the film to need longer drying time in the subsequent drying process, reducing the production efficiency. SUMMARY

[0006] In view of the deficiencies in the prior art, the plastic film printing device solves the problem that the functions of the adjusting device for adjusting the film tension and smoothing the wrinkles are not integrated, need to be set simultaneously, increase the structure of the printing equipment, and make the process complicated, and the ink distribution of the film printing pattern is uneven, which causes the ink in some areas of the film to need a longer drying time in the subsequent drying process, and reduces the production efficiency

[0007] According to the embodiment of the utility model, a plastic film printing device, including the box body, the inside of box body is equipped with printing space, the both ends of printing space are equipped with inlet, outlet, the both sides inner wall of box body still is provided with rack horizontally, the rack setting between inlet and outlet, the position of rack close to inlet, outlet still is equipped with guide roller respectively for pulling plastic film, two the guide roller between still is equipped with ink brush subassembly and printing roller along plastic film pulling direction in proper order, the ink brush subassembly setting at the incoming material side of printing roller printing plastic film, and moving setting on the rack, the top side of ink brush subassembly with the surface of printing roller contact for brushing extra ink, the printing roller with rack rotation is connected, and the ink storage tank is further equipped below the printing roller, and the bottom of printing roller is suspended in the inside of ink storage tank,

[0008] The guide roller between inlet and printing roller is further provided with an adjusting mechanism, the adjusting mechanism is vertically arranged at the top of the box and faces the plastic film, and provides a uniform downward pressing force when contacting the upper surface of the plastic film to adjust the tension. The position of the adjusting mechanism contacting the plastic film is further provided with an adjusting assembly, which provides a force to the surface of the plastic film to spread to both sides to smooth the wrinkles of the plastic film.

[0009] Further, the ink brush assembly includes an ink brush plate and a first bracket fixedly connected to the end of the ink brush plate. The ink brush plate is fixedly connected to the top end side of the first bracket. The bottom of the first bracket is rotationally connected to the inner side of the rack. The ink brush plate is perpendicular to the pulling and conveying direction of the plastic film. The top of the ink brush plate is provided with bristles. The rotation of the first bracket allows the bristles to abut against the surface of the printing roller.

[0010] Further, the ink brush assembly further includes a sliding groove movably arranged adjacent to the bottom of the first bracket and a second bracket slidingly installed in the sliding groove. The second bracket includes a sliding block. The bottom side of the second bracket is rotationally connected to the side of the sliding block. The top side is rotationally connected to the side of the middle region of the first bracket. When the sliding block moves in the sliding groove, it drives the second bracket to move synchronously and drives the first bracket to move away from or close to the printing roller. The sliding groove is further provided with a spring. The spring is installed between the second bracket and the end of the sliding groove away from the printing roller and provides a spring force to keep the bristles on the top of the ink brush plate abutting against the surface of the printing roller.

[0011] Preferably, the inner arc of the ink wiping plate faces the printing roller, and the bristles are distributed in strips on the top of the inner arc surface.

[0012] Further, the adjusting mechanism comprises a hydraulic cylinder vertically arranged on the top of the printing space, and the adjusting assembly comprises a mounting frame and a stretching roller rotatably arranged in the mounting frame, the top of the mounting frame is fixedly connected to the telescopic end of the hydraulic cylinder, and the mounting frame is suspended above the plastic film by the telescopic end of the hydraulic cylinder, and the plastic film passes through the lower surface of the stretching roller under the traction of the guide roller.

[0013] Preferably, the surface of the stretching roller is further provided with annular protrusions around the roller body, the annular protrusions are distributed in a screw shape and extend to the ends from the middle position of the stretching roller, the screw distribution of the annular protrusions as a whole faces opposite directions towards the two ends, and the top of the annular protrusions is in an outer arc shape.

[0014] The technical principle of the utility model is as follows: the printing main body of the device is suspended in the box body to avoid the influence of dust, the guide roller arranged at the feeding port of the rack drags the external plastic film through the feeding port into the printing assembly, the guide roller close to the discharging port drags the plastic film away from the printing roller, if the plastic film is in a slack state at this time, the adjusting assembly vertically arranged on the top of the box body and facing the plastic film will exert a downward pressing force on the plastic film to make the slack plastic film tight again, at the same time, the adjusting assembly in contact with the upper surface of the plastic film will smooth the possible wrinkles on the surface of the plastic film, so that the conveying state of the plastic film returns to normal, then, the conveyed plastic film drives the printing roller to rotate, the printing roller rotates and brings the ink in the ink storage tank at the same time, at this time, the ink wiping assembly arranged at the incoming material side wipes off the excess ink on the surface of the printing roller and uniformly distributes the ink; subsequently, the printing roller with the surface uniformly covered with ink prints the pattern on the surface of the plastic film through the prearranged printing lines on the surface, and finally the plastic film is conveyed out of the printing device after passing through the discharging port. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the embodiment of the utility model.

[0016] Figure 2 It is a part structure planar view of another embodiment of the utility model.

[0017] Figure 3 It is a structure schematic view of the ink wiping assembly of the embodiment of the utility model.

[0018] Figure 4 It is an adjusting mechanism schematic view of the embodiment of the utility model.

[0019] In the above drawings: 1, box body;

[0020] 2, rack; 21, guide roller; 22, printing roller; 23, inlet; 24, outlet;

[0021] 3, adjusting mechanism; 31, hydraulic cylinder; 311, telescopic end; 32, adjusting assembly; 321, mounting bracket; 322, stretching roller; 323, annular protrusion;

[0022] 4, ink storage tank;

[0023] 5, ink brushing assembly; 51, first support; 52, second support; 521, sliding block; 53, ink brushing plate; 531, bristles; 54, sliding groove; 55, spring;

[0024] 6, plastic film;

[0025] A, enlarged view of the ink brushing assembly. DETAILED DESCRIPTION

[0026] The technical solutions in the utility model will be further described below in combination with the drawings and embodiments.

[0027] As Figure 1 shown, according to the embodiment of the utility model, a plastic film printing device comprises a box body 1, the box body 1 is internally provided with a printing space, both ends of the printing space are provided with an inlet 23 and an outlet 24, the inner walls of both sides of the box body 1 are further horizontally provided with a rack 2, the rack 2 is arranged between the inlet 23 and the outlet 24, and the rack 2 is further respectively provided with guide rollers 21 close to the inlet 23 and the outlet 24 for pulling the plastic film 6.

[0028] Through the above structure, the printing main body of the device is suspended in the box body 1, so that the influence of dust is avoided, the external plastic film 6 is pulled through the inlet 23 into the printing assembly by the guide rollers 21 arranged at the inlet 23 of the rack 2, the ink brushing assembly 5 and the printing roller 22 are further arranged in sequence between the two guide rollers 21 along the pulling direction of the plastic film 6, the ink brushing assembly 5 is arranged on the incoming side of the printing roller 22 for printing the plastic film 6 and movably arranged on the rack 2, as Figure 1 , Figure 2 shown, the printed plastic film 6 is pulled through the lower surface of the guide roller 21 and conveyed out of the printing device from the outlet 24 and enters the next processing procedure, such as a drying procedure, and the plastic film 6 is pulled through the lower surface of the guide roller 21 close to the outlet 24, so that the influence on the printed pattern on the plastic film is avoided.

[0029] The top side of the ink brushing assembly 5 is in contact with the surface of the printing roller 22 for brushing off excess ink; the printing roller 22 is rotationally connected with the frame 2, and the conveyed plastic film 6 drives the printing roller 22 to rotate, and the printing roller 22 is further provided with an ink storage box 4 below, and the bottom of the printing roller 22 is suspended in the interior of the ink storage box 4; the printing roller 22 rotates while bringing the ink in the ink storage box 4, at this time, the ink brushing assembly 5 arranged at the incoming side brushes off the excess ink on the surface of the printing roller 22 and brushes the ink evenly; then the printing roller 22 with the surface evenly covered with ink prints the pattern on the surface of the plastic film 6 through the pre-arranged printing lines on the surface.

[0030] The adjusting mechanism 3 is further arranged between the guide roller 21 and the printing roller 22 at the incoming port, and is vertically arranged at the top of the box body 1 and faces the plastic film 6, and provides a uniform downward pressing force when in contact with the upper surface of the plastic film 6 to adjust the tension, and if the part of the plastic film 6 conveyed to this area appears to be in a relaxed state, the adjusting mechanism 3 will exert a downward pressing force on the plastic film 6 to make the relaxed plastic film 6 tight again, and the position where the adjusting mechanism 3 is in contact with the plastic film 6 is further provided with an adjusting assembly 32, which provides a force to the both sides of the surface of the plastic film 6 to smooth the wrinkles of the plastic film 6, so that the plastic film 6 returns to the normal conveying state and then the plastic film 6 can be printed normally, and the printed plastic film 6 passes through the lower surface of the guide roller 21 at the outgoing port 24 area and is sent out from the outgoing port 24 of the printing device, and then enters the next process.

[0031] Further, as shown in Figure 1 , Figure 2 and Figure 3 , the ink brushing assembly 5 includes an ink brushing plate 53 and a first support 51 fixed at the end of the ink brushing plate 53, the ink brushing plate 53 is fixed at the top side of the first support 51, and the ink brushing plate is perpendicular to the traction conveying direction of the plastic film, the bottom of the first support 51 is rotationally connected with the inner side of the frame 2, and the top of the ink brushing plate 53 is provided with bristles 531, and the bristles 531 can be in abutment with the surface of the printing roller 22 through the rotation of the first support 51; when the first support rotates along the fan surface of the inner side surface of the frame 2, the ink brushing plate 53 can be close to or away from the printing roller 22, and in order to avoid the first support 51 rotating 360° so that the bristles 531 on the ink brushing plate 53 cannot play the role of brushing ink, the straight line distance from the position where the bottom of the first support 51 is rotationally connected with the side surface of the frame 2 to the bristles 531, that is, the overall length of the first support 51, is always greater than the vertical distance from this position to the printing roller 22, so as to ensure that the ink brushing plate 53 on the first support 51 always brushes the surface of the printing roller 22 in an inclined state.

[0032] Further, as shown in Figure 3The brush ink assembly 5 further comprises a sliding groove 54 movably arranged at the bottom of the first support 51 and a second support 52 slidingly arranged in the sliding groove 54, the second support 52 comprises a sliding block 521, the bottom side of the second support 52 is rotatably connected to the side of the sliding block 521, and the top side of the second support 52 is rotatably connected to the side of the middle part of the first support 51, when the sliding block 521 moves in the sliding groove 54, the second support 52 moves synchronously and drives the first support 51 to move away from or close to the printing roller 22;

[0033] The second support 52, the sliding groove 54 and the sliding block 521 further limit the rotation range of the first support 51, when the sliding block 521 moves in the sliding groove 54, the second support 52 moves synchronously and drives the first support 51 to rotate, and the distance of the sliding groove 54 limits the rotation of the first support 51 and pulls the first support 51, so that the first support 51 cannot be reversed, the sliding groove 54 further comprises a spring 55, the spring 55 is arranged between the second support 52 and the end of the sliding groove 54 away from the printing roller 22, and provides an elastic force to make the bristles 531 on the top of the brush ink plate 53 always abut against the surface of the printing roller 22, the elastic force of the spring 55 makes the rotation of the first support 51 have a rebound effect, when the printing pattern on the printing roller 22 is uneven, the spring 55 can make the brush ink plate 53 on the first support 51 always close to the surface of the printing roller 22.

[0034] Preferably, as Figure 2 and Figure 3 The brush ink plate 53 is arc-shaped, the inner arc surface of the brush ink plate 53 faces the printing roller 22, and the bristles 531 are arranged in strips on the top of the inner arc surface.

[0035] Further, as Figure 1 and Figure 4The adjustment mechanism 3 includes a hydraulic cylinder 31, which is vertically mounted at the top of the printing space. The adjustment assembly 32 includes a mounting frame 321 and a stretching roller 322 rotatably mounted within the mounting frame 321. The top of the mounting frame 321 is fixedly connected to the telescopic end 311 of the hydraulic cylinder 31. The mounting frame 321 is suspended above the plastic film 6 via the telescopic end 311 of the hydraulic cylinder 31. The plastic film 6 passes through the lower surface of the stretching roller 322 under the traction of the guide roller 21. Two hydraulic cylinders 31 are arranged opposite each other. The tops of both ends of the mounting frame 321 are fixedly connected to the telescopic ends 311 of the hydraulic cylinders 31, thus suspending the entire mounting frame 321. The stretching roller 322... Installed inside, the position of the extension end 311 of the hydraulic cylinder 31 is pre-set to control the overall posture of the adjustment component 32. Under normal circumstances, when the plastic film 6 is conveyed, the film is in a taut state and can relatively support the downward force applied by the adjustment component 32 controlled by the hydraulic cylinder 31. This part of the weight will not affect the taut plastic film 6. However, when the plastic film 6 is conveyed to the position of the adjustment component 32 with a slightly loose state, it cannot relatively support the adjustment component 32. Then, under a part of the pressure pre-set by the hydraulic cylinder 31, the adjustment component 32 will naturally press down on the surface of the plastic film 6, thereby making it taut again.

[0036] Preferred, such as Figure 4 As shown, the surface of the stretching roller 322 is also provided with annular protrusions 323 surrounding the roller body. The annular protrusions 323 are distributed in a spiral pattern and extend from the middle position of the stretching roller 322 to both ends. The top of the annular protrusions 323 is outwardly arc-shaped. This is an improvement on a general circular roller. Figure 4 As shown, annular protrusions 323 spirally surround the roller body on the stretching roller 322. The rotational extension direction of the annular protrusions 323 is reversed from the middle position of the stretching roller 322. At the same time, the central axis of the stretching roller 322 installed in the mounting frame 321 is perpendicular to the traction and conveying direction of the plastic film 6. When the plastic film 6 is pulled through the lower surface of the stretching roller 322, it also drives the stretching roller 322 to rotate. At this time, the annular protrusions 323 distributed on the stretching roller 322 will also rotate with the stretching roller 322 as a whole. The annular protrusions 323 will slowly apply a thrust towards one side of the stretching roller 322 to the plastic film 6 because of their spiral distribution. With the opposite spiral distribution direction, the plastic film 6 can be stretched out towards both ends of the stretching roller 322 and the wrinkles can be smoothed. Setting the top of the annular protrusions 323 to be outward arc-shaped will not damage the plastic film 6.

[0037] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application. The present application is covered by the scope of the claims.

Claims

1. A plastic film printing apparatus, characterized by: The utility model provides a kind of plastic film printing device, including box, the inside of the box is equipped with printing space, the both ends of printing space are equipped with inlet, outlet, the inside wall of the both sides of the box is also horizontally equipped with rack, the rack is arranged between inlet and outlet, the position of the rack is also equipped with guide roller for hauling plastic film respectively close to inlet, outlet, two the guide roller between along plastic film hauling direction is also sequentially equipped with ink brush assembly and printing roller, the ink brush assembly is arranged in the incoming material side of printing roller printing plastic film, and is movably arranged on rack, the top side of the ink brush assembly is in contact with the surface of printing roller for brushing extra ink;The printing roller is rotatably connected with rack, and ink storage tank is further arranged below the printing roller, and the bottom of the printing roller is suspended in the inside of ink storage tank; Between the guide roller and printing roller of the inlet, the adjusting mechanism is further equipped, and the adjusting mechanism is vertically arranged on the top inside the box and towards plastic film, which provides a uniform downward pressing force when in contact with the upper surface of plastic film to adjust tension, and the position of the adjusting mechanism in contact with plastic film is further equipped with adjusting assembly, which provides a force to spread to both sides on the surface of plastic film to smooth the wrinkles of plastic film.

2. A plastic film printing apparatus as claimed in claim 1, wherein: The ink brush assembly includes an ink brush plate and a first bracket vertically fixed to an end of the ink brush plate, the ink brush plate is fixed to a top end side of the first bracket, and the ink brush plate as a whole is perpendicular to the hauling transmission direction of the plastic film, the bottom of the first bracket is rotatably connected to the inside of the rack, and the top of the ink brush plate is provided with bristles, which can be in abutment with the surface of the printing roller by rotating the first bracket.

3. A plastic film printing apparatus as claimed in claim 2, wherein: The ink brush assembly further includes a sliding groove movably arranged adjacent to the bottom of the first bracket and a second bracket slidably installed in the sliding groove, the second bracket includes a sliding block, the bottom side of the second bracket is rotatably connected to the side of the sliding block, and the top side is rotatably connected to the side of the middle region of the first bracket, when the sliding block moves in the sliding groove, it drives the second bracket to move synchronously and drives the first bracket to move away from or close to the printing roller, the sliding groove is further provided with a spring, the spring is installed between the second bracket and the end of the sliding groove away from the printing roller, and provides a spring force to keep the bristles on the top of the ink brush plate in abutment with the surface of the printing roller.

4. A plastic film printing apparatus as claimed in claim 2, wherein: The ink brush plate is arc-shaped, and the inner arc surface faces the printing roller, and the bristles are distributed in strip shape on the top of the inner arc surface.

5. A plastic film printing apparatus as claimed in claim 1, wherein: The adjusting mechanism includes a hydraulic cylinder, which is vertically arranged on the top of the printing space, and the adjusting assembly includes a mounting bracket and a spreading roller rotatably mounted in the mounting bracket, the top of the mounting bracket is fixedly connected to the telescopic end of the hydraulic cylinder, and the mounting bracket is suspended above the plastic film by the telescopic end of the hydraulic cylinder, and the plastic film passes through the lower surface of the spreading roller under the traction of the guide roller.

6. A plastic film printing apparatus as claimed in claim 5, wherein: The surface of the spreading roller is further provided with annular protrusions around the roller body, the annular protrusions are screw-shaped and extend to the ends from the middle position of the spreading roller, the screw-shaped distribution as a whole faces in opposite directions towards the two ends, and the top of the annular protrusions is arc-shaped.

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