Printing device and process for aluminum-plated film packaging bag

Abstract

The invention discloses a printing device and process for an aluminum-plated film packaging bag, and relates to the technical field of aluminum-plated film packaging bag processing. The printing device comprises a base, one side of the base is rotationally provided with an unwinding roller used for outputting a bag body, and the other side of the base is rotationally provided with a winding roller used for inputting the bag body. An intaglio printing module is arranged between the unwinding roller and the winding roller and is used for printing the surface of the output bag body; the intaglio printing module comprises a printing box body, a plate cylinder is rotationally arranged in the printing box body, an impression cylinder is rotationally arranged on one side of the plate cylinder, and an impression gap used for outputting a bag body is formed between the plate cylinder and the impression cylinder; the plate cylinder is not in direct contact with the ink fountain, and after ink on the plate cylinder is scraped, the ink cannot be discharged into the ink fountain, so that the scraped ink is prevented from being repeatedly used for a long time.

Description

Technical Field

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

[0002] Aluminized film packaging bags usually include a bag body, which is a composite packaging material that covers a very thin aluminum layer on the surface of a plastic film through vacuum aluminizing technology. Its core feature is that it combines the flexibility of plastic with the metal barrier properties of aluminum, and is widely used in packaging fields that require barrier properties, freshness preservation and decoration.

[0003] In addition to its own functions, the aesthetics of food packaging bags are also gradually valued by consumers. Food packaging bags with better printing can achieve the purpose of promoting consumption and increasing sales, and can also play a positive role in corporate publicity. Existing food packaging bags are generally printed with exquisite patterns on the surface of food packaging bags through a printing machine.

[0004] The most common printing method at present is gravure printing. The structural parts of gravure printing mainly include plate cylinder, ink scraper, impression cylinder, ink tank and other parts. The working process is as follows: the plate cylinder is immersed in the ink tank, the ink is transferred to the plate cylinder, the ink scraper is used to scrape the ink in the non-image area, and the thick ink layer in the concave area is squeezed and transferred to the surface of the substrate with the help of the high pressure of the impression cylinder, forming a printed pattern with three-dimensional touch and anti-counterfeiting characteristics; During the application process, after the ink scraper scrapes off the ink on the plate cylinder, it will fall back into the ink tank. However, if the scraped ink contains impurities or bubbles, or the solvent evaporates due to exposure to the air, it will affect the printing quality. Correspondingly, if the solvent-based ink is recycled many times, the change in solvent ratio may cause unstable viscosity and affect the inking effect. Summary of the invention

[0005] The purpose of the present invention is to provide a printing device and process for aluminized film packaging bags to solve the following technical problems: After the scraper scrapes the ink off the plate cylinder, it will be directly discharged into the ink tank. Repeated use for a long time will affect the inking effect.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A printing device for aluminum film packaging bags, comprising a base, one side of the base is rotatably provided with an unwinding roller for outputting the bag body, and the other side of the base is rotatably provided with a winding roller for inputting the bag body; A gravure printing module is arranged between the unwinding roller and the winding roller, for printing the surface of the output bag body; The gravure printing module comprises a printing box, in which a printing plate cylinder is rotatably arranged, and an impression cylinder is rotatably arranged on one side of the printing plate cylinder, and an impression gap for outputting the bag body is formed between the printing plate cylinder and the impression cylinder.

[0007] Preferably, the printing box is also provided with an ink tank, on which an ink soaking roller is rotatably provided. The ink soaking roller is arranged adjacent to the printing plate roller, and the ink soaking roller and the printing plate roller have the same rotation direction, so as to transfer the ink attached to the ink soaking roller to the printing plate roller.

[0008] Preferably, arc-shaped sealing plates are symmetrically and slidably arranged on the ink groove, the cylinder of the ink-immersing roller is in close contact with the upper surface of the arc-shaped sealing plates, and the distance between the arc-shaped sealing plates on both sides corresponds to the width of the bag body; Wherein, the arc-shaped sealing plates on both sides are connected to an adjustment module which drives them to move closer to or away from each other.

[0009] Preferably, an ink scraper is fixedly arranged in the printing box, and the end of the ink scraper is in close contact with the wall of the printing plate cylinder.

[0010] Preferably, the plate cylinder and the inking cylinder are connected via a pulley transmission.

[0011] Preferably, the printing box includes two groups of symmetrically arranged box side panels, and the bottoms of the two groups of box side panels are fixedly connected through a box bottom plate.

[0012] Preferably, a first baffle and a second baffle are symmetrically fixedly arranged on both sides of the bottom of the ink-immersing roller, the first baffle and the second baffle are fixed on the bottom plate of the box body, and the first baffle, the second baffle and the bottom plate of the box body enclose an ink groove; Wherein, an oil inlet pipe is provided on one side of the ink tank, and the oil inlet pipe is connected to the oil storage tank through the pump body.

[0013] Preferably, the ink scraper is fixed to a third baffle plate fixedly arranged on the bottom plate of the box body, the ink scraper is arranged at an angle, and the second baffle plate, the third baffle plate and the bottom plate of the box body are enclosed to form a collection groove for collecting scraped ink; Wherein, a drainage pipe is arranged at one side of the bottom of the collecting tank, and the drainage pipe is connected to the recovery box.

[0014] Preferably, the adjustment module comprises a driving box fixed to the bottom of the box bottom plate, a screw is rotatably arranged in the driving box, the threads on both sides of the screw are rotated in opposite directions, and one end of the screw is fixed to the output end of the driving motor fixedly arranged outside the driving box; Wherein, a nut is symmetrically spirally sleeved on the screw rod, and the nut is fixed to the arc-shaped sealing plate through a driving frame.

[0015] A printing process for an aluminized film packaging bag, applied to the printing device for the aluminized film packaging bag, further comprising the following steps: The bag to be printed is output from the unwinding roller; During the output process, the ink in the ink tank is first attached to the surface of the ink immersion cylinder, and then transferred to the plate cylinder through the ink immersion cylinder; When the bag is output from the printing gap, the printing cylinder presses the ink in the intaglio pits of the printing plate cylinder onto the bag to complete the printing; The printed bag is rewound on the take-up roller.

[0016] Beneficial effects of the present invention: (1) The present invention arranges an ink immersion roller so that the ink in the ink tank is first attached to the surface of the ink immersion roller. Since the printing plate roller and the ink immersion roller are adjacent and the two rotate in the same direction, the ink attached to the ink immersion roller can be transferred to the printing plate roller. The printing plate roller of the present invention does not directly contact the ink tank. When the ink on the printing plate roller is scraped off, it will not be discharged into the ink tank, thereby avoiding the long-term repeated use of the scraped ink, thereby effectively improving the printing effect; (2) The present invention can firstly drive the plate cylinder to rotate through the servo motor, and during the rotation of the plate cylinder, the pulley can synchronously drive the ink soaking cylinder to rotate, which not only ensures the synchronization 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 up other servo drive equipment to drive the ink soaking cylinder to rotate, thereby reducing costs; (3) After the ink scraper of the present invention scrapes off the ink on the plate cylinder, the ink can flow along the inclined ink scraper to the collection tank for pre-collection, and finally can be discharged to the recovery tank through the drainage pipe for subsequent recycling; (4) The present invention can adjust the distance between the arc-shaped sealing plates on both sides in real time based on the width of the bag body by adjusting the module, so that the distance between the arc-shaped sealing plates on both sides corresponds to the width of the bag body, thereby isolating the non-ink-immersed area of ​​the ink-immersed roller. When there is no ink attached to the non-ink-immersed area, the ink will not be transferred to the printing plate roller, and the non-pressing area of ​​the printing plate roller will not be attached to the ink. In the prior art, the ink is spread all over the printing plate roller. Therefore, the ink on the non-pressing area cannot be directly recycled after being scraped off by the scraper, thereby causing a waste of ink. Even if it can be recycled after treatment, it makes the entire printing process more complicated and difficult to meet production needs; (5) The present invention transfers the ink in the oil storage tank to the ink tank through the pump body and the oil inlet pipe, so that a part of the bottom area of ​​the ink immersion roller is immersed in the ink. As the ink immersion roller rotates, the ink can be completely attached to the cylinder wall of the ink immersion 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 set 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 immersion 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 through the pump body, thereby ensuring that the bottom area of ​​the ink immersion roller can always be immersed in the ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the structure of a bag body in an aluminized film packaging bag of the present invention; Figure 2 It is a structural schematic diagram of various structures of a bag body in an aluminized film packaging bag of the present invention; Figure 3 The structure of the printing device of the aluminum film packaging bag of the present invention is shown in FIG. Figure 1 ; Figure 4 The structure of the printing device of the aluminum film packaging bag of the present invention is shown in FIG. Figure 2 ; Figure 5 It is a schematic cross-sectional structure diagram of a printing device for an aluminized film packaging bag of the present invention; Figure 6 It is a schematic diagram of the cutaway axonometric structure of a printing device for an aluminized film packaging bag of the present invention; Figure 7 It is a structural schematic diagram of a printing plate cylinder in a printing device for an aluminized film packaging bag of the present invention; Figure 8 It is a schematic structural diagram of ink transfer between an inking roller and a printing plate roller in a printing device for an aluminized film packaging bag of the present invention; Fig. 9 It is a structural schematic diagram of an arc-shaped sealing plate in a printing device for an aluminized film packaging bag of the present invention; Fig.10 It is a structural schematic diagram of a printing box in a printing device for an aluminized film packaging bag of the present invention; Fig.11 The present invention is a schematic diagram of the cross-sectional structure of a printing box in a printing device for an aluminized film packaging bag.

[0019] In the figure: 1, base; 2, support frame; 3, bag body; 4, gravure printing module; 5, plate cylinder; 6, drive box; 101, winding roller; 102, unwinding roller; 103, second guide roller; 104, oil inlet pipe; 105, drain pipe; 201, first guide roller; 202, impression cylinder; 203, third guide roller; 301, substrate film; 302, aluminum coating layer; 303, functional layer; 401, printing box; 402, first baffle; 403, ink tank; 40 4. Second baffle; 405. Ink scraper; 406. Third baffle; 407. Collecting trough; 408. Pulley; 409. Box side plate; 410. Dust plate; 411. Box bottom plate; 501. Ink immersion roller; 502. Arc sealing plate; 503. Guide plate; 601. Drive motor; 602. Drive frame; 603. Nut; 604. Stirring blade; 605. Screw; 701. Lead screw; 702. Push plate; 703. Support; 704. Guide rod; 705. Return spring. DETAILED DESCRIPTION

[0020] The technical scheme of the present invention will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1 See also Figure 1-Figure 2 As shown, the present invention is an aluminized film packaging bag, comprising a bag body 3, the bag body 3 is formed by a base film 301, an aluminized layer 302 and a functional layer 303; specifically, in this embodiment: 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; 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; 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; 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.

[0022] Example 2 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; 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; 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 .

[0023] 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.

[0024] 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.

[0025] 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 .

[0026] It should be noted that you can refer to Figure 4In 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.

[0027] See also Fig.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.

[0028] 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 a plurality of support legs, wherein two groups of first guide rollers 201 are arranged symmetrically in rotation in the support frame 2, and a second guide roller 103 is also arranged rotatably 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, thereby ensuring stability during winding; In addition, after the bag body 3 is printed, in order to dry the printed ink on the surface of the bag body 3, the present embodiment can set a drying fan on the support frame 2 to dry the ink (not shown in the figure). The drying fan is a prior art, and the present embodiment does not elaborate on its specific structure and working principle, so as to meet the demand for drying the ink after printing.

[0029] In order to ensure that the bag body 3 output by the unwinding roller 102 can be stably transported to the embossing gap, in this embodiment, please refer to Figure 5-Figure 6 A third guide roller 203 is rotatably arranged between the unwinding roller 102 and the gravure printing module 4; specifically, after the bag body 3 is output through the unwinding roller 102, it passes through the third guide roller 203 and is then transported to the gravure printing module 4 for printing, which further improves the stability of the bag body 3 during transportation and ensures the printing quality.

[0030] In this embodiment, based on different printing requirements for the bag body 3, the intaglio patterns on the printing plate cylinder 5 are also different. In order to facilitate the replacement of the printing plate cylinder 5 with different intaglio patterns, reference can be made to Fig.10 as well as Fig.11 The printing box 401 includes two groups of symmetrically arranged box side panels 409, and the bottoms of the two groups of box side panels 409 are fixedly connected by a box bottom plate 411, wherein the box bottom plate 411 and the box side panels 409 are detachably fixedly connected by bolts, and the box side panels 409 are detachably fixedly connected to the bottom supporting legs of the support frame 2 by bolts; it can be explained that, by providing a detachable printing box 401 in this embodiment, when printing on different types of bags 3, the printing plate cylinder 5 with different gravure patterns can be replaced in real time by disassembling the printing box 401, thereby realizing the printing needs of different types of bags 3, and the replacement is very convenient.

[0031] In this embodiment, please refer to Figure 2-Figure 3 , Figure 5-Figure 6 as well as Fig.11 The first baffle plate 402 and the second baffle plate 404 are symmetrically fixed on both sides of the bottom of the ink immersion roller 501, and the first baffle plate 402 and the second baffle plate 404 are fixed on the bottom plate 411 of the box body. The first baffle plate 402, the second baffle plate 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 groove 403, and the oil inlet pipe 104 is connected to the oil storage tank through the pump body; specifically, in this embodiment, the ink in the oil storage tank is first transported to the ink groove 403 through the pump body and the oil inlet pipe 104, so that a part of the bottom area of ​​the ink immersion roller 501 is immersed in the ink. In the ink, as the ink immersion roller 501 rotates, the ink can be completely attached to the wall of the ink immersion roller 501. At the same time, in order to ensure that the depth of the ink in the ink tank 403 remains unchanged, this embodiment can set a liquid level sensor in the ink tank 403 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 immersion roller 501 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 403 through the pump body, thereby ensuring that the bottom area of ​​the ink immersion roller 501 can always be immersed in ink.

[0032] In addition, see Figure 4 , Figure 5-Figure 6 as well as Fig.11The scraper 405 of this embodiment is fixed to the third baffle 406 fixedly arranged on the bottom plate 411 of the box body, and the scraper 405 is arranged at an angle. The second baffle 404, the third baffle 406 and the bottom plate 411 of the box body enclose a collecting groove 407 for collecting the scraped ink, wherein a drainage pipe 105 is arranged on one side of the bottom of the collecting groove 407, and the drainage pipe 105 is connected to the recovery box; it can be explained that after the scraper 405 of this embodiment scrapes the ink on the plate cylinder 5, the ink can flow along the inclined scraper 405 to the collecting groove 407 for pre-collection, and finally can be discharged to the recovery box through the drainage pipe 105 for subsequent recycling; Specifically, the contact angle between the scraper 405 and the plate cylinder 5 is usually 45-60 degrees, ensuring that the ink at the edge of the cells is accurately retained.

[0033] It should be noted that the recycling of ink usually requires filtering and adjustment, and it is necessary to use a filter to remove impurities or add a solvent to adjust the viscosity, which is not elaborated in this embodiment.

[0034] As a further solution of this embodiment, please refer to Figure 7 as well as Figure 9-10 When 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.

[0035] 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.

[0036] 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.

[0037] See also Fig. 9 and Fig.11 The adjustment module includes a driving box 6 fixed to the bottom of the box bottom plate 411, and a screw 605 is rotatably arranged in the driving box 6. The threads on both sides of the screw 605 rotate in opposite directions, and one end of the screw 605 is fixed to the output end of a driving motor 601 fixedly arranged on the outside of the driving box 6, wherein a nut 603 is symmetrically spirally sleeved on the screw 605, and the nut 603 is fixed to the arc-shaped sealing plate 502 through a driving frame 602; it can be explained that, in this embodiment, when adjusting the position of the arc-shaped sealing plates 502 on both sides, the driving motor 601 is started to drive the screw 605 to rotate, and the nut 603 can drive the arc-shaped sealing plate 502 to move synchronously through the driving frame 602 during the movement of the screw 605, so as to achieve the adjustment of the distance between the two.

[0038] Correspondingly, the adjustment module of this embodiment can also use other servo drive devices, such as a synchronous belt transmission mechanism or a gear rack transmission mechanism, to drive the arc-shaped sealing plates 502 on both sides to move closer to or away from each other along a straight line, and this embodiment is not limited to this.

[0039] In addition, the printing box 401 further includes dustproof plates 410 fixed on the box side plates 409 on both sides to improve the dustproof effect of the printing box 401 and prevent dust from entering the ink tank 403 to cause ink contamination.

[0040] See also Fig.11A stirring blade 604 is also rotatably arranged in the ink groove 403, and the stirring blade 604 is fixed to the output end of the servo motor fixedly arranged on the side plate 409 of the box body; it can be explained that in this embodiment, by arranging the stirring blade 604 in the ink groove 403, during the actual printing process, the stirring blade 604 can be driven to rotate by the servo motor to stir the ink in real time, thereby avoiding the stratification of the ink and ensuring the quality of ink printing.

[0041] It should also be noted that, in order to ensure the stability of the stamping of the stamping roller 202, in this embodiment, the two ends of the stamping roller 202 are respectively fixed with a support 703, the bottom of the support frame 2 is fixed with a U-shaped frame 7, a screw rod 701 is spirally arranged in the U-shaped frame 7, the end of the screw rod 701 is rotatably connected to the push plate 702, and the two ends of the push plate 702 are respectively fixed with a guide rod 704, and the support 703 is slidably sleeved on the guide rod 704, wherein the guide rod 704 is provided with a return spring 705, one end of the return spring 705 It is fixed to the push plate 702 at one end and fixed to the support 703 at the other end. It can be explained that, in this embodiment, when adjusting the pressure between the impression roller 202 and the printing plate roller 5, the screw rod 701 is rotated, and the screw rod 701 pushes the push plate 702 to move in the direction of the printing plate roller 5, thereby compressing the reset spring 705 and generating an elastic force. Under the elastic force of the reset spring 705, a force can be given to the impression roller 202 toward the printing plate roller 5 to ensure that the pressure of the impression roller 202 meets the impression requirements.

[0042] Specifically, the impression roller 202 of this embodiment realizes the controllable transfer of ink from the printing plate roller 5 to the substrate through the chain reaction of elastic deformation → pressure drive → interface adhesion → dynamic peeling. Its performance directly affects the printing quality (such as ink layer uniformity, dot reproduction degree), and comprehensive parameter optimization is required according to the characteristics of the substrate, ink formula and printing speed; for example, the matching error between the impression roller pressure and the plate roller cell depth needs to be controlled within ±5μm to ensure printing accuracy.

[0043] A printing method of a printing device for an aluminized film packaging bag, comprising the following steps: See also Figure 3-Figure 6 , S1 outputs the bag body 3 to be printed from the unwinding roller 102, passes through the third guide roller 203, the printing gap, two sets of first guide rollers 201 and the second guide roller 103 in sequence, and is rewound on the winding roller 101; During the conveying process S2, the ink in the ink tank 403 is first attached to the surface of the ink immersion roller 501, and then transferred to the plate cylinder 5 through the ink immersion roller 501; S3. During the process of the bag body 3 being outputted in the printing gap, the printing cylinder 202 directly prints the ink in the concave pits of the printing plate cylinder 5 onto the bag body 3 to complete the printing.

[0044] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on 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 number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A printing device for aluminized film packaging bags, 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), 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).

2. The printing device for aluminized film packaging bags according to claim 1, characterized in that: 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) and the ink soaking cylinder (501) are connected in transmission via a pulley (408).

3. The printing device for aluminized film packaging bags according to claim 2, characterized in that: 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.

4. The printing device for aluminized film packaging bags according to claim 3, 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).

5. The printing device for aluminized film packaging bags according to claim 4, 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).

6. The printing device for aluminized film packaging bags according to claim 5, 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.

7. The printing device for aluminized film packaging bags according to claim 6, characterized in that: 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.

8. The printing device for aluminized film packaging bags according to claim 3, characterized in that: The regulating module comprises a driving box (6) fixed to the bottom of the box bottom plate (411), a screw rod (605) is rotatably arranged in the driving box (6), the threads on both sides of the screw rod (605) are rotated in opposite directions, and one end of the screw rod (605) is fixed to the output end of a driving motor (601) fixedly arranged outside the driving box (6); The screw rod (605) is symmetrically spirally sleeved with a nut (603), and the nut (603) is fixed to the arc-shaped sealing plate (502) via a driving frame (602).

9. A printing process for an aluminized film packaging bag, applied to a printing device for an aluminized film packaging bag as claimed in any one of claims 2 to 8, characterized in that: The following steps are also included: The bag body (3) to be printed is outputted 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 immersion roller (501), and then transferred to the printing plate roller (5) through the ink immersion roller (501); During the process of the bag body (3) being output in the printing gap, the printing roller (202) prints the ink in the intaglio pits of the printing plate roller (5) onto the bag body (3), thereby completing the printing; The printed bag body (3) is rewound on a reel (101).

Images