Printing Device and Process for Aluminum-Plated Film Packaging Bags

Abstract

The present invention discloses a printing device and process for aluminized film packaging bags, relating to the technical field of aluminized film packaging bag processing; the printing device includes a base, on one side of the base, a unwind roller for outputting the bag body is rotatably arranged, and on the other side, a windup roller for inputting the bag body is rotatably arranged; an intaglio printing module is arranged between the unwind roller and the windup roller for printing on the surface of the output bag body; the intaglio printing module includes a printing box body, an engraved plate cylinder is rotatably arranged in the printing box body, an impression cylinder is rotatably arranged on one side of the engraved plate cylinder, and an impression gap for outputting the bag body is formed between the engraved plate cylinder and the impression cylinder; the engraved plate cylinder does not directly contact the ink tank, and when the ink on the engraved plate cylinder is scraped off, it will not be discharged into the ink tank, thereby avoiding the long-term repeated use of the scraped ink.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminized film packaging bag processing, and specifically relates to a printing device and process for aluminized film packaging bags. Background Art

[0002] An aluminized film packaging bag usually includes a bag body and is a composite packaging material with an extremely thin aluminum layer covered on the surface of a plastic film through vacuum aluminizing technology. Its core characteristics lie in combining the flexibility of plastic and the metal barrier performance of aluminum, and it is widely used in packaging fields that require barrier properties, freshness preservation, and decoration.

[0003] Apart from its own functions, the aesthetic degree of food packaging bags has gradually been valued by consumers. A food packaging bag with good printing can achieve the purpose of promoting consumption and increasing sales, and can also play a positive role in enterprise publicity. For existing food packaging bags, generally, a printing press is used to print beautiful patterns on the surface of the food packaging bags.

[0004] The currently common printing method is gravure printing. The structural parts of gravure printing mainly include an engraved cylinder, a doctor blade, an impression cylinder, an ink tank, etc. The working process is as follows: The engraved cylinder is immersed in the ink tank to transfer the ink onto the engraved cylinder. After using the doctor blade to scrape off the ink in the non-graphic area, with the high pressure of the impression cylinder, the thick ink layer in the recesses is extruded and transferred onto the surface of the printing substrate to form a printing pattern with a three-dimensional tactile sensation and anti-counterfeiting characteristics;

[0005] During the application process, after the doctor blade scrapes off the ink on the engraved cylinder, it will fall back into the ink tank again. However, if the scraped ink contains impurities, air bubbles, or the solvent volatilizes due to exposure to air, it will affect the printing quality. Correspondingly, if solvent-based ink is recycled multiple times, the change in the solvent ratio may cause the viscosity to be unstable, affecting the ink application effect. Summary of the Invention

[0006] The purpose of the present invention is to provide a printing device and process for aluminized film packaging bags, and solve the following technical problems:

[0007] After the doctor blade scrapes off the ink on the engraved cylinder, it will be directly discharged into the ink tank. After long-term repeated use, it will affect the ink application effect.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A printing device for aluminized film packaging bags includes a base. On one side of the base, a unwind roller for outputting the bag body is rotatably provided, and on the other side, a windup roller for inputting the bag body is rotatably provided;

[0010] An engraved cylinder printing module is arranged between the unwind roller and the windup roller for printing on the surface of the output bag body;

[0011] The intaglio printing module includes a printing box body, in which an engraved plate cylinder is rotatably arranged. A printing cylinder is rotatably arranged on one side of the engraved plate cylinder. An imprinting gap for outputting the bag body is formed between the engraved plate cylinder and the printing cylinder.

[0012] Preferably, an ink tank is also arranged in the printing box body. An ink dipping roller is rotatably arranged on the ink tank. The ink dipping roller is adjacent to the engraved plate cylinder and has the same rotation direction as the engraved plate cylinder, so as to transfer the ink attached to the ink dipping roller to the engraved plate cylinder.

[0013] Preferably, arc-shaped sealing plates are symmetrically and slidably arranged on the ink tank. The cylinder body of the ink dipping roller is in close contact with the upper surface of the arc-shaped sealing plate. The distance between the two arc-shaped sealing plates on both sides corresponds to the width of the bag body.

[0014] Wherein, the two arc-shaped sealing plates on both sides are connected to an adjusting module for driving them to approach or move away from each other.

[0015] Preferably, a scraping knife is also fixedly arranged in the printing box body. The end of the scraping knife is in close contact with the wall of the engraved plate cylinder.

[0016] Preferably, the engraved plate cylinder and the ink dipping roller are connected by belt pulleys.

[0017] Preferably, the printing box body includes two groups of symmetrically arranged box body side plates, and the bottoms of the two groups of box body side plates are fixedly connected by a box body bottom plate.

[0018] Preferably, first baffles and second baffles are symmetrically and fixedly arranged on both sides of the bottom of the ink dipping roller respectively. The first baffles and the second baffles are fixed on the box body bottom plate. The first baffles, the second baffles and the box body bottom plate enclose to form an ink tank.

[0019] Wherein, an oil inlet pipe is arranged on one side of the ink tank. The oil inlet pipe is connected to an oil storage tank through a pump body.

[0020] Preferably, the scraping knife is fixed to a third baffle fixedly arranged on the box body bottom plate. The scraping knife is inclined. The second baffle, the third baffle and the box body bottom plate enclose to form a collection tank for collecting the ink after scraping.

[0021] Wherein, a drain pipe is arranged on one side of the bottom of the collection tank. The drain pipe is connected to a recovery box.

[0022] Preferably, the adjusting module includes a driving box body fixed to the bottom of the box body bottom plate. A screw rod is rotatably arranged in the driving box body. The thread directions on both sides of the screw rod are opposite. One end of the screw rod is fixed to the output end of a driving motor fixed to the outside of the driving box body.

[0023] Among them, nuts are symmetrically and spirally sleeved on the screw rod, and the nuts are fixed to the arc-shaped sealing plate through a driving frame.

[0024] A printing process for aluminized film packaging bags, applied to the above-mentioned printing device for aluminized film packaging bags, further includes the following steps:

[0025] Output the bag body to be printed from the unwind roller;

[0026] During the output process, the ink in the ink tank is first attached to the surface of the ink-dipping roller, and then transferred to the plate cylinder through the ink-dipping roller;

[0027] During the output process of the bag body at the imprinting gap, the imprinting roller presses the ink in the recessed pits of the plate cylinder's intaglio onto the bag body to complete printing;

[0028] The printed bag body is rewound on the winding roller.

[0029] Advantages of the present invention:

[0030] (1) By setting the ink-dipping roller in the present invention, the ink in the ink tank is first attached to the surface of the ink-dipping roller. Since the plate cylinder is adjacent to the ink-dipping roller and the two rotate in the same direction, the ink attached to the ink-dipping roller can be transferred to the plate cylinder. The plate cylinder of the present invention does not directly contact the ink tank, and when the ink on the plate cylinder is scraped off, it will not be discharged into the ink tank, thus avoiding the long-term repeated use of the scraped ink and effectively improving the printing effect;

[0031] (2) In the present invention, the servo motor can first drive the plate cylinder to rotate. During the rotation of the plate cylinder, the ink-dipping roller can be synchronously driven to rotate through the pulley, which not only ensures the synchronism and stability of the two, but also enables the two to rotate in the same direction. At the same time, there is no need to set other servo drive devices to drive the ink-dipping roller to rotate, reducing the cost;

[0032] (3) After the doctor blade scrapes off the ink on the plate cylinder, the ink can flow along the inclined doctor blade into the collection tank for pre-collection, and finally can be discharged into the recycling tank through the drain pipe for subsequent recycling;

[0033] (4) Based on the width of the bag body, the present invention can adjust the distance between the two arc-shaped sealing plates in real time through the adjustment module, so that the distance between the two arc-shaped sealing plates corresponds to the width of the bag body, thereby isolating the non-ink-dipping area of the ink-dipping roller. When there is no ink attached to the non-ink-dipping area, the ink will not be transferred to the printing plate cylinder, so that the non-printing area of the printing plate cylinder will not be attached with ink either. In the prior art, the ink is covered on the printing plate cylinder. Therefore, for the ink on the non-printing area, after being scraped off by the doctor blade, it cannot be directly recycled, resulting in waste of ink. Even if it can be recycled after treatment, it also makes the entire printing process more complicated and difficult to meet the production requirements;

[0034] (5) The present invention transports the ink in the storage tank to the ink tank through the pump body and the inlet pipe, so that a part of the area at the bottom of the ink-dipping roller is immersed in the ink. As the ink-dipping roller rotates, the ink can be completely attached to the cylinder wall of the ink-dipping roller. At the same time, in order to ensure that the depth of the ink in the ink tank remains unchanged, the present invention can be provided with a liquid level sensor in the ink tank to monitor the ink depth in real time. The liquid level sensor is electrically connected to the pump body through the controller. As the ink-dipping roller takes away part of the ink, when the ink depth decreases, the controller sends an electrical signal to the pump body to replenish the ink into the ink tank again through the pump body, so as to ensure that the bottom area of the ink-dipping roller can always be immersed in the ink. Brief Description of the Drawings

[0035] The following further describes the present invention with reference to the drawings.

[0036] Figure 1 is a schematic structural diagram of the bag body in a aluminized film packaging bag of the present invention;

[0037] Figure 2 is a schematic structural diagram of each structure of the bag body in a aluminized film packaging bag of the present invention;

[0038] Figure 3 is a schematic structural diagram of the printing device of a aluminized film packaging bag of the present invention Figure 1 ;

[0039] Figure 4 is a schematic structural diagram of the printing device of a aluminized film packaging bag of the present invention Figure 2 ;

[0040] Figure 5 is a schematic cross-sectional structural diagram of the printing device of a aluminized film packaging bag of the present invention;

[0041] Figure 6 is a schematic cutaway axonometric structural diagram of the printing device of a aluminized film packaging bag of the present invention;

[0042] Figure 7It is a schematic structural diagram of a printing plate cylinder in a printing device for an aluminized film packaging bag of the present invention;

[0043] Figure 8 It is a schematic structural diagram when an ink dipping roller and a printing plate cylinder transfer ink in a printing device for an aluminized film packaging bag of the present invention;

[0044] Figure 9 It is a schematic structural diagram of an arc-shaped sealing plate in a printing device for an aluminized film packaging bag of the present invention;

[0045] Figure 10 It is a schematic structural diagram of a printing box body in a printing device for an aluminized film packaging bag of the present invention;

[0046] Figure 11 It is a schematic sectional structure diagram of a printing box body in a printing device for an aluminized film packaging bag of the present invention.

[0047] In the figure: 1, base; 2, support frame; 3, bag body; 4, gravure printing module; 5, printing plate cylinder; 6, driving box body; 101, winding roller; 102, unwinding roller; 103, second guiding roller; 104, oil inlet pipe; 105, liquid discharge pipe; 201, first guiding roller; 202, impression cylinder; 203, third guiding roller; 301, base material film; 302, aluminized layer; 303, functional layer; 401, printing box body; 402, first baffle; 403, ink tank; 404, second baffle; 405, scraping knife; 406, third baffle; 407, collection tank; 408, pulley; 409, box body side plate; 410, dust-proof plate; 411, box body bottom plate; 501, ink dipping roller; 502, arc-shaped sealing plate; 503, guide plate; 601, driving motor; 602, driving frame; 603, nut; 604, stirring blade; 605, screw rod; 701, lead screw; 702, pushing plate; 703, support; 704, guide rod; 705, return spring. Detailed implementation manners

[0048] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] Embodiment 1

[0050] Please refer to Figure 1 - Figure 2 As shown, the present invention is an aluminized film packaging bag, including a bag body 3, and the bag body 3 is formed by laminating a base material film 301, an aluminized layer 302, and a functional layer 303; specifically, in this embodiment:

[0051] The substrate film 301 is an outer layer, which is made of PET (polyester), BOPP (biaxially oriented polypropylene) or PA (nylon) to provide good mechanical strength, stiffness and printing performance;

[0052] The aluminum plating layer 302 is an intermediate layer, which deposits an extremely thin aluminum metal layer (thickness of about 30-50nm) on the surface of the substrate through vacuum aluminum plating technology to block oxygen, water vapor, light (especially ultraviolet rays) and extend the shelf life of food or medicine;

[0053] The functional layer 303 is an inner layer, which is made of PE (polyethylene), CPP (cast polypropylene) or EVOH (ethylene-vinyl alcohol copolymer) to facilitate sealing and ensure the sealing of the package;

[0054] The bag body 3 of this embodiment achieves a balance among appearance, barrier, sealing and cost through the synergistic effect of multiple layers of materials so that the aluminized film packaging bag can achieve.

[0055] Example 2

[0056] Based on Example 1, please refer to Figure 1 , Figure 3 - Figure 5 The present embodiment provides a printing device for an aluminized film packaging bag, which is used for printing the outer layer of a bag body 3. The printing device includes a base 1, on one side of which a discharging roller 102 for outputting the bag body 3 is rotatably provided, and on the other side of which a reeling roller 101 for inputting the bag body 3 is rotatably provided;

[0057] A gravure printing module 4 is arranged between the unwinding roller 102 and the winding roller 101 to print the surface of the output bag body 3;

[0058] Specifically, in this embodiment, after the bag body 3 to be printed is outputted from the unwinding roller 102 , the surface of the bag body 3 is printed by the gravure printing module 4 , and the bag body 3 after printing is rewound on the winding roller 101 .

[0059] In this embodiment, please refer to Figure 5 - Figure 6 The gravure printing module 4 includes a printing box 401, in which a printing plate cylinder 5 is rotatably arranged, and an impression cylinder 202 is rotatably arranged on one side of the printing plate cylinder 5, and an impression gap for outputting the bag body 3 is formed between the printing plate cylinder 5 and the impression cylinder 202; specifically, after the bag body 3 is output by the unwinding roller 102, it is output through the impression gap. During the output process, the impression cylinder 202 directly prints the ink in the gravure pits of the printing plate cylinder 5 onto the bag body 3, thereby achieving the printing effect.

[0060] As a further solution of this embodiment, please refer to Figure 5 - Figure 6 as well as Figure 8, an ink tank 403 is also arranged in the printing box 401, and an ink soaking roller 501 is rotatably arranged on the ink tank 403, and the ink soaking roller 501 is arranged adjacent to the printing plate cylinder 5, and the ink soaking roller 501 and the printing plate cylinder 5 have the same rotation direction, so as to transfer the ink attached to the ink soaking roller 501 to the printing plate cylinder 5; it can be explained that, in this embodiment, by arranging the ink soaking roller 501, the ink in the ink tank 403 is first attached to the surface of the ink soaking roller 501, because the printing plate cylinder 5 is adjacent to the ink soaking roller 501, and the two keep rotating in the same direction, so the ink attached to the ink soaking roller 501 can be transferred to the printing plate cylinder 5, the printing plate cylinder 5 of this embodiment is not in direct contact with the ink tank 403, and when the ink on the printing plate cylinder 5 is scraped off, it will not be discharged into the ink tank 403, thereby avoiding the long-term repeated use of the scraped ink, and effectively improving the printing effect.

[0061] In addition, the ink-immersing roller 501 of the present embodiment may be made of a soft material (such as a resin plate) to enhance ink adhesion and facilitate the transfer of ink to the plate roller 5 .

[0062] It should be noted that you can refer to Figure 4 In this embodiment, the plate cylinder 5 and the ink soaking cylinder 501 are connected through a pulley 408. Specifically, in this embodiment, the servo motor can first drive the plate cylinder 5 to rotate, and during the rotation of the plate cylinder 5, the pulley 408 can synchronously drive the ink soaking cylinder 501 to rotate, which not only ensures the synchronization and stability of the two, but also allows the two to rotate in the same direction. At the same time, there is no need to set up other servo drive equipment to drive the ink soaking cylinder 501 to rotate, thereby reducing costs.

[0063] See also Figure 11 A scraper 405 is also fixedly arranged in the printing box 401, and the end of the scraper 405 is in close contact with the wall of the printing plate cylinder 5. It can be explained that in this embodiment, by arranging the scraper 405, as the printing plate cylinder 5 rotates, the scraper 405 can be used to scrape off the ink in the non-image area on the printing plate cylinder 5, and then the high pressure of the impression cylinder 202 can be used to squeeze and transfer the thick ink layer in the depression to the surface of the bag body 3, forming a printed pattern with three-dimensional touch and anti-counterfeiting characteristics.

[0064] As a further solution of this embodiment, after the bag body 3 is printed, in order to ensure that it is stably transported to the winding roller 101, please refer to Figure 3 and Figure 4, a support frame 2 is also arranged on the base 1, and the support frame 2 is fixed to the base 1 through several groups of support legs. Among them, two groups of first guide rollers 201 are symmetrically and rotatably arranged in the support frame 2, and a second guide roller 103 is also rotatably arranged between the support frame 2 and the winding roller 101; specifically, after the bag body 3 is printed, it can pass through the two groups of first guide rollers 201 and the second guide roller 103 in sequence and then be rewound onto the winding roller 101, ensuring the stability during winding;

[0065] In addition, after the bag body 3 is printed, in order to dry the printing ink on the surface of the bag body 3, in this embodiment, a drying fan can be arranged on the support frame 2 to dry the ink (not shown in the figure). The drying fan is a prior art, and the specific structure and working principle thereof are not described in detail in this embodiment, as long as the drying requirement of the printed ink is met.

[0066] In order to ensure that the bag body 3 output by the unwinding roller 102 can be stably conveyed to the imprinting gap, in this embodiment, please refer to Figure 5 - Figure 6 , a third guide roller 203 is also rotatably arranged between the unwinding roller 102 and the gravure printing module 4; specifically, after the bag body 3 is output by the unwinding roller 102, it passes through the third guide roller 203 and then is conveyed to the gravure printing module 4 for printing, further improving the stability during the conveyance of the bag body 3 and ensuring the printing quality.

[0067] In this embodiment, based on different printing requirements for the bag body 3, the gravure patterns on the printing plate cylinder 5 are also different. In order to facilitate the replacement of the printing plate cylinder 5 with different gravure patterns, reference can be made to Figure 10 and Figure 11 , the printing box body 401 includes two groups of box body side plates 409 arranged symmetrically, and the bottoms of the two groups of box body side plates 409 are fixedly connected through a box body bottom plate 411. Among them, the box body bottom plate 411 and the box body side plate 409 are detachably fixedly connected by bolts, and the box body side plate 409 and the bottom support legs of the support frame 2 are detachably fixedly connected by bolts; it can be explained that in this embodiment, by providing the detachable printing box body 401, when printing different types of bag bodies 3, the printing plate cylinder 5 with different gravure patterns can be replaced in real time by disassembling the printing box body 401, thereby realizing the printing requirements for different types of bag bodies 3, and the replacement is very convenient.

[0068] In this embodiment, reference can be made to Figure 2 - Figure 3 , Figure 5 - Figure 6 and Figure 11, on both sides of the bottom of the ink-soaking roller 501, a first baffle 402 and a second baffle 404 are symmetrically and fixedly arranged respectively. The first baffle 402 and the second baffle 404 are fixed on the bottom plate 411 of the box body. The first baffle 402, the second baffle 404 and the bottom plate 411 of the box body enclose an ink tank 403. Among them, an oil inlet pipe 104 is arranged on one side of the ink tank 403, and the oil inlet pipe 104 is connected to the oil storage tank through a pump body. Specifically, in this embodiment, the ink in the oil storage tank is first transported to the ink tank 403 through the pump body and the oil inlet pipe 104, so that a partial area at the bottom of the ink-soaking roller 501 is immersed in the ink. As the ink-soaking roller 501 rotates, the ink can be completely attached to the barrel wall of the ink-soaking roller 501. At the same time, in order to ensure that the depth of the ink in the ink tank 403 remains unchanged, a liquid level sensor can be set in the ink tank 403 in this embodiment to monitor the ink depth in real time. The liquid level sensor is electrically connected to the pump body through a controller. As the ink-soaking roller 501 takes away part of the ink, when the ink depth decreases, the controller sends an electric signal to the pump body to replenish the ink into the ink tank 403 again through the pump body, so as to ensure that the bottom area of the ink-soaking roller 501 can always be immersed in the ink.

[0069] In addition, reference can be made to Figure 4 , Figure 5 - Figure 6 and Figure 11 , the doctor blade 405 of this embodiment is fixed to the third baffle 406 fixedly arranged on the bottom plate 411 of the box body. The doctor blade 405 is inclined. The second baffle 404, the third baffle 406 and the bottom plate 411 of the box body enclose a collection tank 407 for collecting the ink after scraping. Among them, a drain pipe 105 is arranged on one side of the bottom of the collection tank 407, and the drain pipe 105 is connected to the recycling box. It can be explained that after the doctor blade 405 of this embodiment scrapes the ink on the printing plate cylinder 5, the ink can flow along the inclined doctor blade 405 into the collection tank 407 for preliminary collection, and finally can be drained into the recycling box through the drain pipe 105 for subsequent recycling.

[0070] Specifically, the contact angle between the doctor blade 405 and the printing plate cylinder 5 is usually 45-60°, ensuring that the ink at the edge of the cell is accurately retained.

[0071] It should be noted that the recycling of ink usually requires filtration and adjustment, and impurities need to be removed with a filter screen, or a solvent is added to adjust the viscosity. This embodiment will not elaborate on this.

[0072] As a further solution of this embodiment, reference can be made to Figure 7 and Figure 9 - Figure 10When producing different types of aluminum-coated film packaging bags, the width of the bag body 3 is also different. Therefore, when the width of the bag body 3 changes, in order to prevent the non-printing area of ​​the plate cylinder 5 from transferring ink, an arc-shaped sealing plate 502 is symmetrically slidably arranged on the ink groove 403, and the cylinder of the ink immersion cylinder 501 is in close contact with the upper surface of the arc-shaped sealing plate 502. The spacing between the arc-shaped sealing plates 502 on both sides corresponds to the width of the bag body 3, wherein the arc-shaped sealing plates 502 on both sides are connected to an adjustment module that drives them to move closer or farther from each other; it can be explained that in this embodiment, the arc-shaped sealing plates 502 on both sides can be adjusted in real time by adjusting the module based on the width of the bag body 3. The spacing between the arc-shaped sealing plates 502 on both sides corresponds to the width of the bag body 3, so that the non-ink-immersed area of ​​the ink-immersed roller 501 can be isolated. When there is no ink attached to the non-ink-immersed area, the ink will not be transferred to the printing plate roller 5, so that the non-pressing area of ​​the printing plate roller 5 will not adhere to the ink. In the prior art, the ink is spread all over the printing plate roller 5. Therefore, the ink on the non-pressing area cannot be directly recycled after being scraped off by the scraper 405, thereby causing a waste of ink. Even if it can be recycled after processing, it makes the entire printing process more complicated and difficult to meet production needs.

[0073] Specifically, the scraped ink needs to be filtered, blended, and tested for performance (such as IGT printability tester testing) before it can be used again. Direct reuse may lead to printing defects (such as line jaggedness, insufficient adhesion), or even equipment damage (such as pump valve blockage). This embodiment can avoid direct contamination of the ink tank 403 by scraped ink through independent recycling, closed-loop circulation, structural improvement, and environmental control. In actual production, about 70% of the recycled ink can be reused after treatment, and the remaining 30% is treated as hazardous waste (must meet environmental protection standards); illustratively, this solution has been widely used in high-speed gravure printing machines (speed>300m / min), which can reduce the ink waste rate from 15% to <5%, while improving printing stability.

[0074] In this embodiment, guide plates 503 are fixedly arranged at both ends of the arc-shaped sealing plate 502, and the guide plates 503 are slidably mounted on the first baffle plate 402 and the second baffle plate 404. Specifically, when the adjustment module drives the arc-shaped sealing plates 502 on both sides to slide, it can simultaneously drive the guide plates 503 to slide on the first baffle plate 402 and the second baffle plate 404, so as to improve the stability of the arc-shaped sealing plate 502 when sliding.

[0075] See also Figure 9 and Figure 11, the adjustment module includes a driving box body 6 fixed to the bottom of the box body bottom plate 411. A screw rod 605 is rotatably arranged in the driving box body 6. The thread directions on both sides of the screw rod 605 are opposite. One end of the screw rod 605 is fixed to the output end of a driving motor 601 fixedly arranged outside the driving box body 6. Among them, nuts 603 are symmetrically helically sleeved on the screw rod 605, and the nuts 603 are fixed to the arc-shaped sealing plate 502 through a driving frame 602. It can be explained that when adjusting the positions of the two arc-shaped sealing plates 502 in this embodiment, the driving motor 601 is started to drive the screw rod 605 to rotate. During the movement of the nut 603 on the screw rod 605, the arc-shaped sealing plate 502 can be driven to move synchronously through the driving frame 602 to realize the adjustment of the distance between the two.

[0076] Correspondingly, the adjustment module of this embodiment can also adopt other servo drive devices, such as a synchronous belt drive mechanism or a gear rack drive mechanism, to realize driving the two arc-shaped sealing plates 502 to approach or move away from each other along a straight line. This embodiment does not limit this.

[0077] In addition, the printing box body 401 further includes dust-proof plates 410 fixed to the two box body side plates 409 to improve the dust-proof effect of the printing box body 401 and prevent dust from entering the ink tank 403 and causing ink pollution.

[0078] It can be referred to Figure 11 , a stirring blade 604 is also rotatably arranged in the ink tank 403, and the stirring blade 604 is fixed to the output end of a servo motor fixedly arranged on the box body side plate 409. It can be explained that by arranging the stirring blade 604 in the ink tank 403 in this embodiment, during the actual printing process, the servo motor can be used to drive the stirring blade 604 to rotate to stir the ink in real time, avoid the phenomenon of ink stratification, and ensure the quality of ink printing.

[0079] It should also be noted that, in order to ensure the stability of the impression of the impression cylinder 202, in this embodiment, supports 703 are fixedly arranged at both ends of the impression cylinder 202, and a U-shaped frame 7 is fixedly arranged at the bottom of the support frame 2. A lead screw 701 is spirally arranged in the U-shaped frame 7. The end of the lead screw 701 is rotatably connected to a push plate 702. Guide rods 704 are fixedly arranged at both ends of the push plate 702. The supports 703 are slidably sleeved on the guide rods 704. Among them, a return spring 705 is arranged on the guide rod 704. One end of the return spring 705 is fixed to the push plate 702, and the other end is fixed to the support 703. It can be explained that when adjusting the pressure between the impression cylinder 202 and the plate cylinder 5 in this embodiment, the lead screw 701 is rotated, and the lead screw 701 pushes the push plate 702 to move towards the plate cylinder 5, thereby compressing the return spring 705 and generating an elastic force. Under the elastic force of the return spring 705, an acting force towards the plate cylinder 5 can be given to the impression cylinder 202 to ensure that the pressure of the impression cylinder 202 meets the impression requirements.

[0080] Specifically, the impression cylinder 202 of this embodiment realizes the controllable transfer of the ink from the plate cylinder 5 to the printing substrate through a chain reaction of elastic deformation → pressure drive → interfacial adhesion → dynamic peeling. Its performance directly affects the printing quality (such as ink layer uniformity, dot reproducibility), and comprehensive parameter optimization needs to be carried out according to the characteristics of the printing substrate, ink formula and printing speed; Exemplarily, the matching error between the impression roller pressure and the plate roller cell depth needs to be controlled within ±5 μm to ensure the printing accuracy.

[0081] A printing method of a printing device for aluminized film packaging bags includes the following steps:

[0082] Please refer to Figure 3 - Figure 6 , S1 The bag body 3 to be printed is output from the unwinding roller 102, and is sequentially rewound on the winding roller 101 through the third guide roller 203, the impression gap, two groups of first guide rollers 201 and the second guide roller 103;

[0083] S2 During the conveying process, the ink in the ink tank 403 is first attached to the surface of the ink-dipping roller 501, and then transferred to the plate cylinder 5 through the ink-dipping roller 501;

[0084] S3 During the output process of the bag body 3 at the impression gap, the impression cylinder 202 directly imprints the ink in the recessed pits of the plate cylinder 5 onto the bag body 3 to complete the printing.

[0085] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0086] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] The above has described in detail one embodiment of the present invention, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A printing device for an aluminized film packaging bag, characterized in that, It comprises a base (1), one side of the base (1) being rotatably provided with an unwinding roller (102) for outputting a bag body (3), and the other side of the base (1) being rotatably provided with a winding roller (101) for inputting a bag body (3); A gravure printing module (4) is arranged between the unwinding roller (102) and the winding roller (101) for printing the surface of the output bag body (3); The gravure printing module (4) comprises a printing box (401), a printing plate cylinder (5) is rotatably arranged in the printing box (401), an impression cylinder (202) is rotatably arranged on one side of the printing plate cylinder (5), and an impression gap for outputting the bag body (3) is formed between the printing plate cylinder (5) and the impression cylinder (202); The printing box (401) is also provided with an ink tank (403), an ink soaking roller (501) is rotatably provided on the ink tank (403), the ink soaking roller (501) is arranged adjacent to the printing plate roller (5), and the ink soaking roller (501) and the printing plate roller (5) have the same rotation direction, so as to transfer the ink attached to the ink soaking roller (501) to the printing plate roller (5); The printing plate cylinder (5) is connected to the ink soaking cylinder (501) via a belt pulley (408); The ink groove (403) is symmetrically and slidably provided with arc-shaped sealing plates (502), the cylinder body of the ink-immersing roller (501) is in close contact with the upper surface of the arc-shaped sealing plates (502), and the distance between the arc-shaped sealing plates (502) on both sides corresponds to the width of the bag body (3); The arc-shaped sealing plates (502) on both sides are connected to an adjustment module that drives them to move closer to or away from each other.

2. The printing device for an aluminized film packaging bag according to claim 1, characterized in that, An ink scraper (405) is also fixedly arranged in the printing box (401), and the end of the ink scraper (405) is in close contact with the wall of the printing plate cylinder (5).

3. The printing device for an aluminized film packaging bag according to claim 2, characterized in that, The printing box (401) comprises two groups of symmetrically arranged box side panels (409), and the bottoms of the two groups of box side panels (409) are fixedly connected via a box bottom plate (411).

4. The printing device for an aluminized film packaging bag according to claim 3, characterized in that, A first baffle (402) and a second baffle (404) are symmetrically fixedly arranged on both sides of the bottom of the ink-immersing roller (501); the first baffle (402) and the second baffle (404) are fixed on the bottom plate (411) of the box body; the first baffle (402), the second baffle (404) and the bottom plate (411) of the box body enclose an ink groove (403); Wherein, an oil inlet pipe (104) is provided on one side of the ink tank (403), and the oil inlet pipe (104) is connected to the oil storage tank through a pump body.

5. The printing device for an aluminized film packaging bag according to claim 4, wherein, The ink scraper (405) is fixed to a third baffle (406) fixedly arranged on the bottom plate (411) of the box body. The ink scraper (405) is arranged in an inclined manner. The second baffle (404), the third baffle (406) and the bottom plate (411) of the box body are enclosed to form a collection groove (407) for collecting scraped ink. A drainage pipe (105) is provided at one side of the bottom of the collection tank (407), and the drainage pipe (105) is connected to the recovery box.

6. The printing device for an aluminized film packaging bag according to claim 3, characterized in that, The adjustment module includes a driving box body (6) fixed to the bottom of the box body bottom plate (411). A screw rod (605) is rotatably arranged in the driving box body (6). The thread directions on both sides of the screw rod (605) are opposite. One end of the screw rod (605) is fixedly connected to the output end of a driving motor (601) fixedly arranged outside the driving box body (6). Wherein, nuts (603) are symmetrically and spirally sleeved on the screw rod (605), and the nuts (603) are fixed to the arc-shaped sealing plate (502) through a driving frame (602).

7. A printing process for an aluminized film packaging bag, applied to a printing device for an aluminized film packaging bag according to any one of claims 2-6, characterized in that, It further includes the following steps: Output the bag body (3) to be printed from the unwinding roller (102). During the output process, the ink in the ink tank (403) is first attached to the surface of the ink-dipping roller (501), and then transferred to the printing plate cylinder (5) through the ink-dipping roller (501). During the output of the bag body (3) in the imprinting gap, the imprinting roller (202) imprints the ink in the recessed pits of the intaglio plate of the printing plate cylinder (5) onto the bag body (3) to complete the printing. The printed bag body (3) is rewound on the winding roller (101).

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