Plastic film double-sided printing machine

Abstract

The utility model relates to the technical field of film printing, in particular to a plastic film double-sided printing machine which comprises a bottom plate and the like, a machine shell is fixedly installed on the top face of the bottom plate, an opening is formed in the front side face of the machine shell, and a plurality of sets of door plates are symmetrically installed at the position of the opening in the front side of the machine shell in a hinged mode. The plastic film winding device comprises a bottom plate and further comprises winding frames, first motors, film winding shafts and the like, the winding frames are fixedly installed on the two sides of the bottom plate at intervals, the first motors are fixedly installed on the winding frames, the film winding shafts are fixedly assembled on output shafts of the first motors, one film winding shaft is a plastic film unwinding shaft, and the other film winding shaft is a plastic film winding shaft. The two sets of printing rollers are arranged to print the front face and the back face of the plastic film at the same time, the supporting shaft and the opening frame are matched, the plastic film keeps stable tension in the running process and is unfolded in an annular opening shape, and high-quality double-face printing of the plastic film can be achieved easily.

Description

Technical Field

[0001] This utility model relates to the field of film printing technology, specifically to a double-sided printing machine for plastic films. Background Technology

[0002] With the continuous advancement of modern industrial technology, printing technology is becoming increasingly widespread and important in various industries, especially in packaging, advertising, and electronics, where the demand for plastic film printing is showing a year-on-year upward trend. Plastic film, with its lightweight, transparency, water resistance, and moisture-proof properties, is widely used in food packaging, daily chemical packaging, and electronic product protective films.

[0003] Most plastic film printing equipment on the market currently only supports single-sided printing. This limitation leads to low production efficiency and cannot directly meet the growing demand for double-sided printing. Traditional single-sided printing equipment requires two separate operation processes to complete the printing task on both sides when processing products that require double-sided printing. This not only increases production complexity and time costs but may also lead to printing errors due to inaccurate secondary positioning. In addition, the manual intervention in multiple operations increases the risk of contamination and damage to the film, thus affecting the quality of the final product and production efficiency. Therefore, we propose a double-sided plastic film printing machine to solve the above problems. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a double-sided printing machine for plastic film.

[0005] The technical solution is as follows: A double-sided printing machine for plastic film includes a base plate, a housing, and door panels. The base plate is the load-bearing carrier of the printing machine. The housing is fixedly installed on the top surface of the base plate. The front side of the housing is open, and multiple door panels are symmetrically hinged at the front opening of the housing. The machine also includes a winding frame, a first motor, a film winding shaft, brackets, a stretching frame, a support shaft, a pigment rack, a second motor, and a printing roller. Winding frames are fixedly installed at intervals on both sides of the base plate. A first motor is fixedly installed on each winding frame. A film winding shaft is fixedly mounted on the output shaft of the first motor. One of the film winding shafts is the unwinding shaft for the plastic film, and the other is the rewinding shaft for the plastic film. Multiple brackets are also fixedly installed on the top surface of the base plate. These brackets are spaced apart inside the housing. The system has varying heights and is divided into two groups by a winding frame. Each support frame has a symmetrically rotatably connected support shaft at its top, which is used to expand the plastic film to be printed. The winding frames are distributed among multiple supports, and each support frame has a fixedly connected opening frame at its top, which is used to expand the plastic film into an annular opening on the support. Both sets of supports have ink racks fixedly mounted at their bottoms. The top of each ink rack is a ink frame for holding printing ink. A second motor is fixedly mounted on one side of the upper part of the ink rack, and a printing roller is fixedly mounted on the output shaft of the second motor. The printing rollers are located in the ink frames at the top of the ink racks, and the two printing rollers rotate to contact the front and back sides of the expanded plastic film. The support is equipped with a drying element for drying the ink on the plastic film.

[0006] Preferably, each of the door panels has an opening, and each opening is fitted with an observation window, which is specifically made of tempered glass.

[0007] Preferably, a scraper is fixedly mounted on one side of the pigment frame at the top of the pigment holder. The blade of the scraper contacts and engages with the printing roller. The scraper is used to clean excess ink from the printing roller.

[0008] Preferably, the base plate is also provided with a tension mechanism for increasing the tension of the plastic film. The tension mechanism includes a guide plate, a guide rod, a slider, and a rotating roller. The guide plate is fixedly installed between multiple supports of the base plate. The guide plate has two sets of sliding grooves. The guide rod is fixedly connected in the sliding groove of the guide plate. The rotating roller is mounted on the guide rod through the slider. A spring is sleeved on the guide rod between the guide plate and the slider. The rotating rollers on the upper and lower layers of the guide plate are used to further stretch the plastic film under the action of the spring.

[0009] Preferably, bearings are fixedly installed on the opposite sides of the two sliders, and the rotating roller is rotatably assembled between the bearings of the two sliders.

[0010] Preferably, the drying unit is located near two pigment racks. The drying unit includes a mounting frame and a UV lamp. The mounting frame is fixedly connected to the bottom of the support frame near the pigment rack. Each mounting frame is equipped with a UV lamp for drying ink on the surface of a plastic film.

[0011] This utility model has the following advantages:

[0012] 1. This utility model sets two sets of printing rollers to print on both sides of the plastic film simultaneously. With the help of the support shaft and the spreading frame, the plastic film maintains stable tension and unfolds in a ring-shaped opening during operation, which is conducive to achieving high-quality double-sided printing on the plastic film.

[0013] 2. The door panel of this utility model is equipped with an observation window made of tempered glass, which makes it convenient for operators to monitor the printing process in real time, detect abnormalities in a timely manner, and improve the safety and convenience of equipment use and maintenance.

[0014] 3. This utility model is equipped with a scraper to remove excess ink from the surface of the printing roller, ensuring clear printing patterns and uniform color. Combined with a UV lamp, it quickly dries the printed ink, shortens the drying time, and improves the quality of printed products and production efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the motor, film winding shaft, and bracket of this utility model for winding plastic film.

[0017] Figure 3 This is a three-dimensional structural diagram of the pigment holder, motor, printing roller, and doctor blade of this utility model.

[0018] Figure 4 This diagram shows the connection relationship between the guide rail plate, guide rod, slider, bearing and rotating roller of this utility model.

[0019] The above-mentioned attached drawings include the following reference numerals: 1. base plate, 2. housing, 3. door panel, 31. observation window, 4. motor one, 5. winding frame, 51. film winding shaft, 6. plastic film, 7. bracket, 71. spreading frame, 8. support shaft, 9. pigment rack, 10. motor two, 11. printing roller, 12. doctor blade, 13. guide rail plate, 131. guide rod, 14. slider, 141. bearing, 15. rotating roller, 16. spring, 17. mounting bracket, 18. UV lamp. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] A double-sided printing machine for plastic film, such as Figures 1-4 As shown, the printing press includes a base plate 1, a housing 2, and door panels 3. The base plate 1 serves as the load-bearing structure of the printing press. The housing 2 is fixedly mounted on the top surface of the base plate 1. The front side of the housing 2 is open, and multiple sets of door panels 3 are symmetrically hinged at the front opening of the housing 2. The press also includes a winding frame 5, a first motor 4, a film winding shaft 51, a bracket 7, a support frame 71, a support shaft 8, a pigment rack 9, a second motor 10, and a printing roller 11. The winding frame 5 is fixedly mounted on both sides of the base plate 1 at intervals, and each winding frame 5 is fixedly mounted with... Motor 4 has a film winding shaft 51 fixedly mounted on its output shaft. One film winding shaft 51 serves as the unwinding shaft for the plastic film 6, and the other serves as the take-up shaft for the plastic film 6. Multiple supports 7 are also fixedly mounted on the top surface of the base plate 1. The supports 7 are spaced apart within the machine housing 2 and are divided into two groups by a winding frame 5. Each support 7 has a symmetrically rotatably connected support shaft 8 at its top. The support shaft 8 is used to expand the plastic film 6 to be printed. The winding frame 5 is divided into... The plastic film 6 is spread out among multiple supports 7, and each support 7 has a fixed support frame 71 at its top. The support frame 71 is used to spread the plastic film 6 into an annular opening on the support 7. The bottom of each set of supports 7 is fixedly equipped with a pigment rack 9. The top of the pigment rack 9 is a pigment frame for holding printing pigment. A motor 2 10 is fixedly installed on one side of the upper part of the pigment rack 9. A printing roller 11 is fixedly installed on the output shaft of the motor 2 10. The printing roller 11 is located in the pigment frame at the top of the pigment rack 9. The two printing rollers 11 rotate and contact the front and back sides of the spread plastic film 6 respectively. The support 7 is equipped with a drying element for drying the ink on the plastic film 6. By pulling the plastic film 6 on one film roll 51 and passing it around each support shaft 8 on the support 7, the free section of the plastic film 6 is connected to another film roll 51. Under the action of the support shaft 8 and the support frame 71, the printing roller 11 can print on both sides of the plastic film 6 at the same time, thereby improving the production efficiency of printing the plastic film 6.

[0022] like Figure 1 As shown, each door panel 3 has an opening, and each opening of the door panel 3 is equipped with an observation window 31. The observation window 31 is made of tempered glass and is used to observe the printing status of the plastic film 6 inside the printing press from outside the door panel 3.

[0023] like Figure 2 and Figure 3 As shown, a scraper 12 is fixedly mounted on one side of the top pigment frame of the pigment holder 9. The blade of the scraper 12 contacts and engages with the printing roller 11. The scraper 12 is used to clean excess ink on the printing roller 11 to ensure the consistency and uniformity of the color printed by the printing roller 11 onto the plastic film 6.

[0024] like Figure 2 and Figure 4 As shown, the base plate 1 is also provided with a tension mechanism for increasing the tension of the plastic film 6. The tension mechanism includes a guide plate 13, a guide rod 131, a slider 14, and a rotating roller 15. The guide plate 13 is fixedly installed between multiple supports 7 of the base plate 1. The guide plate 13 is provided with two sets of sliding grooves. The guide rod 131 is fixedly connected in the sliding grooves of the guide plate 13. The rotating roller 15 is mounted on the guide rod 131 through the slider 14. The guide rod 131 between the guide plate 13 and the slider 14 is fitted with a spring 16. The rotating rollers 15 on the upper and lower layers of the guide plate 13 are used to further stretch the plastic film 6 under the action of the spring 16, thereby increasing the tension of the plastic film 6 during printing.

[0025] like Figure 2 and Figure 4 As shown, bearings 141 are fixedly installed on the opposite sides of the two sliders 14. The rotating roller 15 is rotatably assembled between the bearings 141 of the two sliders 14. Under the action of the spring 16, the rotating roller 15 can always apply pressure to the plastic film 6 in contact, so that the printed plastic film 6 remains taut.

[0026] like Figure 2 As shown, the drying components are located near the two ink holders 9. The drying components include mounting brackets 17 and UV lamps 18. The mounting brackets 17 are fixedly connected to the bottom of the support frame 71 near the ink holder 9. Each mounting bracket 17 is equipped with a UV lamp 18 for drying the ink on the surface of the plastic film 6, thereby improving the drying efficiency of the plastic film 6 after printing.

[0027] When using this printing press to perform double-sided printing on plastic film 6, the operator first installs the roll of plastic film 6 to be printed onto the unwinding shaft 51. Then, the plastic film 6 is pulled around the support shafts 8 at the top of each set of brackets 7, forming a square, continuously unfolded planar printing section under the guidance of the annular opening of the spreading frame 71. Finally, the end of the plastic film 6 is fixed onto the take-up shaft 51. After starting the equipment, the two motors 4 drive the corresponding unwinding and take-up shafts to rotate synchronously. During transmission, the tension of the plastic film 6 is dynamically adjusted through a tension mechanism. The slider 14 on the guide plate 13 pushes the rotating roller 15 outward to press the plastic film 6 through the pre-tension force of the spring 16, ensuring that the plastic film 6 always maintains a uniform tension and preventing the pattern from being damaged due to slack during printing. In the misalignment process, when the printing area of ​​the plastic film 6 enters the ink holder 9, the motors 10 in the two sets of ink holders 9 drive the front and back printing rollers 11 to rotate at high speed. After the printing rollers 11 are immersed in the ink frame to absorb ink, the doctor blade 12 precisely scrapes off the excess ink on the roller surface to ensure that only the ink layer of the set thickness is retained. At this time, the front and back sides of the film simultaneously contact the rotating printing rollers 11, and the double-sided pattern is transferred synchronously under pressure. The printed film then enters the drying area. The UV lamp 18 installed at the bottom of the support frame 71 emits high-intensity ultraviolet light to quickly cure the ink molecules and prevent the undried ink from sticking together during winding. The entire process is monitored in real time through the tempered glass observation window 31 on the door panel 3, thereby realizing a continuous production closed loop from drying to automatic winding, which significantly improves printing efficiency and quality stability.

[0028] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A double-sided printing machine for plastic film, comprising a base plate (1), a housing (2) and door panels (3), wherein the housing (2) is fixedly installed on the top surface of the base plate (1), and multiple sets of door panels (3) are symmetrically hinged at the front opening of the housing (2); Its characteristics are, It also includes winding frames (5) fixedly installed at intervals on both sides of the base plate (1). A motor (4) is fixedly installed on the winding frame (5). A film winding shaft (51) is fixedly mounted on the output shaft of the motor (4). One of the film winding shafts (51) is the unwinding shaft of the plastic film (6), and the other is the rewinding shaft of the plastic film (6). Multiple brackets (7) are also fixedly installed on the top surface of the base plate (1). The brackets (7) are distributed at intervals in the housing (2) and divided into two groups. The top of each bracket (7) is symmetrically rotatably connected to a support shaft (8). Each of the brackets (7) is fixedly connected to a support frame (71) at the top. Both sets of brackets (7) are fixedly equipped with pigment racks (9) at the bottom. The top of the pigment rack (9) is a pigment frame. A motor (10) is fixedly installed on one side of the upper part of the pigment rack (9). A printing roller (11) is fixedly installed on the output shaft of the motor (10). The printing roller (11) is located in the pigment frame of the pigment rack (9). The two printing rollers (11) rotate and contact the front and back sides of the stretched plastic film (6) respectively. The bracket (7) is provided with a drying element for drying the ink on the plastic film (6).

2. A double-sided printing machine for plastic film according to claim 1, characterized in that, Each of the door panels (3) has an opening, and each opening of the door panel (3) is fitted with an observation window (31).

3. A double-sided printing machine for plastic film according to claim 2, characterized in that, A scraper (12) is fixedly mounted on one side of the top pigment frame of the pigment holder (9), and the blade of the scraper (12) is in contact with the printing roller (11).

4. A double-sided printing machine for plastic film according to claim 3, characterized in that, The base plate (1) is also provided with a tension mechanism, which includes a guide plate (13), a guide rod (131), a slider (14) and a rotating roller (15). The guide plate (13) is fixedly installed between multiple supports (7) of the base plate (1). The guide plate (13) is provided with two sets of sliding grooves. The guide rod (131) is fixedly connected in the sliding groove of the guide plate (13). The rotating roller (15) is assembled on the guide rod (131) through the slider (14). The guide rod (131) between the guide plate (13) and the slider (14) is fitted with a spring (16).

5. A double-sided printing machine for plastic film according to claim 4, characterized in that, Bearings (141) are fixedly installed on the opposite sides of the sliders (14) on both sides. The rotating roller (15) is rotatably assembled between the bearings (141) of the sliders (14) on both sides. Under the action of the spring (16), the rotating roller (15) can always apply pressure to the plastic film (6) in contact, so that the printed plastic film (6) remains taut.

6. A double-sided printing machine for plastic film according to claim 5, characterized in that, The drying components are located near the two pigment racks (9) respectively. The drying components include mounting brackets (17) and UV lamps (18). The mounting brackets (17) are fixed to the bottom of the support frame (71) near the pigment rack (9) respectively. Each mounting bracket (17) is equipped with a UV lamp (18).

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