Packaging bag printing method

Abstract

The invention discloses a packaging bag printing method. The packaging bag printing method comprises the following steps that S1, a packaging bag coiled material is fed to printing equipment; s2, the packaging bag is unwound and subjected to surface corona treatment; s3, one side of the packaging bag subjected to corona treatment is subjected to printing treatment; s4, the packaging bag subjected to one-time printing treatment is turned over, and the other side of the packaging bag is subjected to printing treatment; and S5, the packaging bag subjected to two-side printing is rolled and discharged. The printing equipment comprises a first printing mechanism and a second printing mechanism, and the first printing mechanism and the second printing mechanism are stacked up and down. According to the packaging bag printing method, the surfaces of the two sides of the packaging bag can be rapidly and efficiently printed through the printing equipment provided with the first printing mechanism and the second printing mechanism, the packaging bag does not need to be disassembled, assembled and overturned frequently, and the printing efficiency is improved; and positioning errors generated in the packaging bag dismounting and mounting process can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bag printing methods, in particular to a packaging bag printing method. Background Art

[0002] Packaging bag printing equipment is a type of machine specially used for printing patterns, texts, logos, etc. on various packaging bags. These equipment are widely used in the production of packaging bags for various commodities such as food, medicine, daily necessities, cosmetics, industrial products, etc. The main types of existing packaging bag printing equipment include gravure printing machines, flexographic printing machines, screen printing machines, offset printing machines and digital printing machines. Among them, digital printing machines directly transfer digital images to packaging materials through inkjet or laser technology, without the need to make printing plates. They are suitable for small batches and multi-variety personalized printing, with fast printing speed and flexible pattern conversion.

[0003] The Chinese patent application number CN202410557722.0 discloses a tactile ink packaging bag printing device and printing method. The exhaust holes on the air delivery cylinder of the invention are arranged circumferentially. When the packaging bag is output circumferentially in the drying cylinder, the heated air is in contact with the ink on the surface of the packaging bag for a longer time, thereby improving the drying effect; at the same time, the drying cylinder is a closed structure as a whole, and only one set of receiving interfaces is provided for exhaust, so that the overall thermal insulation performance of the drying cylinder is better, the hot air is prevented from flowing too fast, and the cost is saved; in the invention, the packaging bag is outside the guide roller. When transporting the bag outside, the guide roller is driven to rotate based on the friction between the bag and the guide roller. The guide roller can synchronously drive the gear to rotate through the telescopic part. The gear drives the turntable to rotate by meshing with the gear ring. The turntable can drive the air pump to rotate through the rotating shaft, so as to ensure the normal rotation of the air pump without an external power source. Such a setting can also synchronize the rotation of the air pump with the transportation of the bag, and make the heated air sprayed from the exhaust hole with a larger spray range, further improving the drying effect. That is, the invention speeds up the drying of ink and improves the printing efficiency of the bag. However, the above-mentioned packaging bag printing method does not solve the technical problem that when the packaging bag needs to be printed on both sides, the packaging bag needs to be disassembled and turned over, which affects the production efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide a packaging bag printing method to address the technical problem of insufficient efficiency of double-sided printing in existing packaging bag printing methods.

[0005] A packaging bag printing method, the packaging bag printing method comprising the following steps: S1. Loading the packaging bag coil to the printing equipment; S2, unwinding the packaging bag and performing surface corona treatment; S3, the packaging bag after corona treatment is printed on one side; S4, after completing one printing process, the packaging bag is turned over and the other side is printed; S5. After printing on both sides, the packaging bags are rolled up and unloaded.

[0006] The printing device includes a first printing mechanism and a second printing mechanism, and the first printing mechanism and the second printing mechanism are stacked up and down, so that, in the above-mentioned step S3, the packaging bag after the corona treatment is printed on one side of the surface by the first printing mechanism; then in the above-mentioned step S4, the packaging bag after one printing is turned over and conveyed to the second printing mechanism on the bottom side for printing on the other side of the surface.

[0007] In one embodiment, the above-mentioned printing equipment includes a frame, a reel, a plurality of feed rods and a correction device, and the reel, the plurality of feed rods and the correction device are all arranged on the frame, wherein the reel is arranged at one end of the frame, the correction device is arranged on the adjacent side of the reel, and the plurality of feed rods are arranged between the reel and the correction device for guiding the packaging bag roll and assisting in feeding.

[0008] In one of the embodiments, in the above-mentioned step S1, the packaging bag roll is installed on the unwinding roller, the packaging bag roll is unwound by the unwinding roller, and is conveyed to the correction device through a plurality of feeding rods. The correction device can correct the conveying path of the packaging bag to ensure that the packaging bag is conveyed along the preset conveying path.

[0009] In one of the embodiments, the printing device further comprises a corona device, which is arranged on the adjacent side of the deviation-correcting device, and a plurality of feeding rods are arranged between the corona device and the deviation-correcting device to perform corona treatment on the packaging bag.

[0010] In one of the embodiments, in the above step S2, after the packaging bag is unwound and deflected, it is conveyed to a corona device through a plurality of feeding rods for corona treatment on both sides, thereby increasing the surface energy of the surfaces on both sides of the packaging bag, thereby improving the adhesion of the packaging bag surface to the ink.

[0011] In one embodiment, the above-mentioned first printing mechanism is arranged on the adjacent side of the corona device; at the same time, a partition wall is arranged on the frame, and the partition wall divides the frame into a working side and a receiving side; the unwinding roller, a plurality of material passing rods, a correction device and a corona device are all arranged on the working side; the first printing mechanism and the partition wall are movably cooperated, so that the first printing mechanism can reciprocate between the receiving side and the working side.

[0012] In one embodiment, the printing device further comprises a first electrostatic rod, which is arranged between the corona device and the first printing mechanism, so that the first electrostatic rod can remove static electricity on the surface of the packaging bag.

[0013] In one embodiment, the above-mentioned printing equipment also includes a first ultraviolet light source, which is arranged on the adjacent side of the first printing mechanism, and a feeding rod is arranged between the first ultraviolet light source and the first printing mechanism, so that when the first printing mechanism prints the packaging bag with photocurable ink, the first ultraviolet light source can promote the rapid curing of the ink on the surface of the packaging bag through ultraviolet light irradiation.

[0014] In one of the embodiments, in the above-mentioned step S3, after the packaging bag completes the corona treatment, it is conveyed to the first electrostatic rod for surface static removal treatment, and then conveyed toward the first printing mechanism; when the equipment is in working state, the first printing mechanism moves to the working side relative to the partition wall, and at this time, the packaging bag is printed on one side of the surface through the first printing mechanism; after completing one side of the printing, the packaging bag is conveyed to the first ultraviolet light source through the feed rod for surface ink photocuring treatment.

[0015] In one embodiment, the above-mentioned printing equipment also includes a first traction shaft, which is arranged between the first electrostatic rod and the first printing mechanism. The packaging bag that has completed the electrostatic removal treatment is transported to the first printing mechanism under the traction of the first traction shaft for printing on one side.

[0016] In one embodiment, the second printing mechanism is disposed on the bottom side of the first printing mechanism, and the second printing mechanism is movably matched with the partition wall, so that the second printing mechanism can reciprocate between the receiving side and the working side.

[0017] In one of the embodiments, the printing device further comprises a second electrostatic rod, which is disposed adjacent to the second printing mechanism, so that the second electrostatic rod can remove static electricity on the surface of the packaging bag again.

[0018] In one embodiment, the above-mentioned printing equipment also includes a second ultraviolet light source, which is arranged on the adjacent side of the second printing mechanism, and a material passing rod is arranged between the second ultraviolet light source and the second printing mechanism. Therefore, when the second printing mechanism prints the packaging bag with photocurable ink, the second ultraviolet light source can promote the rapid curing of the ink on the surface of the packaging bag through ultraviolet light irradiation.

[0019] In one of the embodiments, in the above-mentioned step S4, after the packaging bag completes printing on one side of the surface, it is turned over to the other side of the surface through a plurality of feeding rods, transported to the second electrostatic rod for surface static removal treatment, and then transported to the second printing mechanism; when the equipment is in working state, the second printing mechanism moves to the working side relative to the partition wall, and at this time, the packaging bag is printed on the other side of the surface through the second printing mechanism; after the printing on the other side is completed, the packaging bag is transported to the second ultraviolet light source through the feeding rod for surface ink photocuring treatment.

[0020] In one embodiment, the printing device further comprises a second traction shaft, which is disposed adjacent to the second ultraviolet light source. The packaging bag that has completed the second light curing treatment is flipped again under the traction of the second traction shaft and transported toward the unloading end.

[0021] In one embodiment, the above-mentioned printing equipment also includes a third traction shaft and a winding roller, the winding roller is arranged at the other end of the working side relative to the unwinding roller, the third traction shaft is arranged on the adjacent side of the winding roller, and a plurality of material passing rods are arranged between the third traction shaft and the second traction shaft and the winding roller.

[0022] In one of the embodiments, in the above-mentioned step S5, after the packaging bag is printed on both sides, it is flipped by the second traction shaft and then transported to the third traction shaft through a plurality of feeding rods. Then, under the drive of the third traction shaft, the packaging bag is transported to the winding roller through a plurality of feeding rods for winding and unloading, thereby completing the printing process of the packaging bag.

[0023] The above-mentioned packaging bag printing method is to stack the first printing mechanism and the second printing mechanism, and the first printing mechanism and the second printing mechanism up and down, so that in the above-mentioned step S3, the packaging bag after the corona treatment is printed on one side of the surface by the first printing mechanism; then in the above-mentioned step S4, the packaging bag after one printing is turned over and conveyed to the second printing mechanism on the bottom side for printing on the other side. Based on this, the packaging bag printing method of the present invention can quickly and efficiently print the two side surfaces of the packaging bag through the printing equipment provided with the first printing mechanism and the second printing mechanism. Compared with the traditional packaging bag two-sided printing method, the packaging bag printing method and printing equipment of the present invention do not need to frequently disassemble and flip the packaging bag. While improving the printing efficiency, it can effectively avoid the positioning error generated during the disassembly and assembly of the packaging bag, thereby improving the printing processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a packaging bag printing method in one embodiment; Figure 2 A schematic diagram of the structure of a packaging bag printing method in one embodiment; Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the AA portion in the illustrated embodiment. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] See also Figures 1 to 3 The present invention discloses a packaging bag printing method, which comprises the following steps: S1, the packaging bag coil is fed to the printing device 10; S2, unwinding the packaging bag and performing surface corona treatment; S3, the packaging bag after corona treatment is printed on one side; S4, after completing one printing process, the packaging bag is turned over and the other side is printed; S5. After printing on both sides, the packaging bags are rolled up and unloaded.

[0032] Specifically, the above-mentioned printing device 10 includes a first printing mechanism 101 and a second printing mechanism 102, and the first printing mechanism 101 and the second printing mechanism 102 are stacked up and down, so that in the above-mentioned step S3, the packaging bag after the corona treatment is printed on one side of the surface by the first printing mechanism 101; then in the above-mentioned step S4, the packaging bag after one printing is turned over and conveyed to the second printing mechanism 102 on the bottom side for printing on the other side. Based on this, the packaging bag printing method of the present invention can quickly and efficiently print the two side surfaces of the packaging bag by using the printing device 10 provided with the first printing mechanism 101 and the second printing mechanism 102. Compared with the traditional packaging bag two-sided printing method, the packaging bag printing method and printing device 10 of the present invention do not need to frequently disassemble and flip the packaging bag. While improving the printing efficiency, it can effectively avoid the positioning error generated during the disassembly and assembly of the packaging bag, thereby improving the printing processing quality.

[0033] Furthermore, the printing device 10 includes a frame 100, a reel 103, a plurality of feed rods 104 and a deflection correction device 105. The reel 103, the plurality of feed rods 104 and the deflection correction device 105 are all arranged on the frame 100, wherein the reel 103 is arranged at one end of the frame 100, the deflection correction device 105 is arranged on the adjacent side of the reel 103, and the plurality of feed rods 104 are arranged between the reel 103 and the deflection correction device 105 for guiding the packaging bag coil and assisting in feeding. Specifically, in the above step S1, the packaging bag coil is installed on the reel 103, the packaging bag coil is unwound by the reel 103, and is conveyed to the deflection correction device 105 by the plurality of feed rods 104. The deflection correction device 105 can correct the conveying path of the packaging bag to ensure that the packaging bag is conveyed along the preset conveying path.

[0034] Furthermore, the printing device 10 further comprises a corona device 106, which is arranged on the adjacent side of the deflection correction device 105, and a plurality of feeding rods 104 are arranged between the corona device 106 and the deflection correction device 105 to perform corona treatment on the packaging bag. Specifically, in the above step S2, after the packaging bag is unwound and deflected, it is conveyed to the corona device 106 by the plurality of feeding rods 104 for corona treatment on both sides, thereby increasing the surface energy of the surfaces on both sides of the packaging bag, thereby improving the adhesion of the packaging bag surface to the ink.

[0035] Furthermore, the first printing mechanism 101 is arranged on the adjacent side of the corona device 106; at the same time, the frame 100 is provided with a partition wall 1001, and the partition wall 1001 divides the frame 100 into a working side a and a receiving side b; the unwinding roller 103, a plurality of material passing rods 104, a deviation correction device 105 and the corona device 106 are all arranged on the working side a; the first printing mechanism 101 and the partition wall 1001 are movably matched, so that the first printing mechanism 101 can reciprocate between the receiving side b and the working side a. In one embodiment, the above-mentioned printing device 10 also includes a first electrostatic rod 107, which is arranged between the corona device 106 and the first printing mechanism 101, so that the first electrostatic rod 107 can remove static electricity on the surface of the packaging bag. In one embodiment, the printing device 10 further includes a first ultraviolet light source 108, which is disposed on the adjacent side of the first printing mechanism 101, and a feeding rod 104 is disposed between the first ultraviolet light source 108 and the first printing mechanism 101, so that when the first printing mechanism 101 prints the packaging bag with photocurable ink, the first ultraviolet light source 108 can promote the rapid curing of the ink on the surface of the packaging bag through ultraviolet light irradiation. Specifically, in the above-mentioned step S3, after the packaging bag completes the corona treatment, it is transported to the first electrostatic rod 107 for surface static removal treatment, and then transported toward the first printing mechanism 101; when the equipment is in working state, the first printing mechanism 101 moves to the working side a relative to the partition wall 1001, and at this time, the packaging bag is printed on one side of the surface through the first printing mechanism 101; after the packaging bag is printed on one side, it is transported to the first ultraviolet light source 108 through the feeding rod 104 for photocuring treatment of the surface ink, thereby improving the curing speed of the ink. In one embodiment, the above-mentioned printing device 10 also includes a first traction shaft 109, which is arranged between the first electrostatic rod 107 and the first printing mechanism 101. The packaging bag that has completed the electrostatic removal treatment is transported to the first printing mechanism 101 under the traction of the first traction shaft 109 to perform printing on one side, thereby ensuring the conveying power and conveying stability of the packaging bag.

[0036] Furthermore, the second printing mechanism 102 is arranged on the bottom side of the first printing mechanism 101, and the second printing mechanism 102 is movably matched with the partition wall 1001, so that the second printing mechanism 102 can reciprocate between the receiving side b and the working side a. In one embodiment, the printing device 10 further includes a second electrostatic rod 110, which is arranged on the adjacent side of the second printing mechanism 102, so that the second electrostatic rod 110 can remove the static electricity on the surface of the packaging bag again. In one embodiment, the printing device 10 further includes a second ultraviolet light source 111, which is arranged on the adjacent side of the second printing mechanism 102, and the second ultraviolet light source 111 is provided with a feed rod 104 between the second printing mechanism 102, so that when the second printing mechanism 102 prints the packaging bag with photocurable ink, the second ultraviolet light source 111 can promote the rapid curing of the ink on the surface of the packaging bag through ultraviolet light irradiation. Specifically, in the above step S4, after the packaging bag has completed printing on one side of the surface, it is turned over to the other side of the surface through a plurality of feeding rods 104, and is transported to the second electrostatic rod 110 for surface static removal treatment, and then transported toward the second printing mechanism 102; when the equipment is in working state, the second printing mechanism 102 moves to the working side a relative to the partition wall 1001, and at this time, the packaging bag is printed on the other side of the surface through the second printing mechanism 102; after the printing on the other side is completed, the packaging bag is transported to the second ultraviolet light source 111 through the feeding rod 104 for surface ink photocuring treatment, so as to increase the curing speed of the ink. In one embodiment, the above printing device 10 also includes a second traction shaft 112, and the second traction shaft 112 is arranged on the adjacent side of the second ultraviolet light source 111. The packaging bag that has completed the second photocuring treatment is turned over again under the traction of the second traction shaft 112 and transported toward the unloading end.

[0037] Furthermore, the printing device 10 further includes a third traction shaft 113 and a winding roller 114. The winding roller 114 is arranged at the other end of the working side a relative to the unwinding roller 103. The third traction shaft 113 is arranged at the adjacent side of the winding roller 114, and a plurality of feeding rods 104 are arranged between the third traction shaft 113 and the second traction shaft 112 and the winding roller 114. Specifically, in the above step S5, after the packaging bag has been printed on both sides, it is turned over by the second traction shaft 112 and then conveyed to the third traction shaft 113 by the plurality of feeding rods 104. Then, under the drive of the third traction shaft 113, the packaging bag is conveyed to the winding roller 114 by the plurality of feeding rods 104 for winding and unloading, thereby completing the printing process of the packaging bag.

[0038] In summary, the packaging bag printing method of the present invention stacks the first printing mechanism and the second printing mechanism, and the first printing mechanism and the second printing mechanism up and down, so that in the above-mentioned step S3, the packaging bag after the corona treatment is printed on one side of the surface by the first printing mechanism; then in the above-mentioned step S4, the packaging bag after one printing is turned over and conveyed to the second printing mechanism on the bottom side for printing on the other side. Based on this, the packaging bag printing method of the present invention can quickly and efficiently print on both sides of the packaging bag through the printing equipment provided with the first printing mechanism and the second printing mechanism. Compared with the traditional packaging bag two-sided printing method, the packaging bag printing method and printing equipment of the present invention do not need to frequently disassemble and flip the packaging bag. While improving the printing efficiency, it can effectively avoid the positioning error generated during the disassembly and assembly of the packaging bag, thereby improving the printing processing quality.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A packaging bag printing method, characterized in that: include: Follow these steps: S1. Loading the packaging bag coil to the printing equipment; S2, unwinding the packaging bag and performing surface corona treatment; S3, the packaging bag after corona treatment is printed on one side; S4, after completing one side of the printing process, the packaging bag is turned over and the other side is printed; S5, the packaging bags after printing on both sides are rolled up and unloaded; The printing device includes a first printing mechanism and a second printing mechanism, and the first printing mechanism and the second printing mechanism are stacked up and down, so that, in the above-mentioned step S3, the packaging bag after the corona treatment is printed on one side of the surface by the first printing mechanism; then in the above-mentioned step S4, the packaging bag after one printing is turned over and conveyed to the second printing mechanism on the bottom side for printing on the other side of the surface.

2. The packaging bag printing method according to claim 1, characterized in that: The printing equipment includes a frame, a reel, a plurality of feed rods and a correction device, wherein the reel, the plurality of feed rods and the correction device are all arranged on the frame, wherein the reel is arranged at one end of the frame, the correction device is arranged at the adjacent side of the reel, and the plurality of feed rods are arranged between the reel and the correction device for guiding the packaging bag roll and assisting in feeding.

3. The packaging bag printing method according to claim 2, characterized in that: The printing equipment also includes a corona device, which is arranged on the adjacent side of the deviation-correcting device, and a plurality of feeding rods are arranged between the corona device and the deviation-correcting device to perform corona treatment on the packaging bag.

4. The packaging bag printing method according to claim 3, characterized in that: The first printing mechanism is arranged on the adjacent side of the corona device; at the same time, a partition wall is arranged on the frame, and the partition wall divides the frame into a working side and a receiving side; the unwinding roller, a plurality of material passing rods, a correction device and a corona device are all arranged on the working side; the first printing mechanism and the partition wall are movably cooperated, so that the first printing mechanism can reciprocate between the receiving side and the working side.

5. The packaging bag printing method according to claim 4, characterized in that: The printing equipment also includes a first ultraviolet light source, which is arranged on the adjacent side of the first printing mechanism. A material passing rod is arranged between the first ultraviolet light source and the first printing mechanism. Therefore, when the first printing mechanism prints the packaging bag with photocurable ink, the first ultraviolet light source can promote the rapid curing of the ink on the surface of the packaging bag through ultraviolet light irradiation.

6. The packaging bag printing method according to claim 5, characterized in that: The second printing mechanism is arranged on the bottom side of the first printing mechanism, and the second printing mechanism is movably matched with the partition wall, so that the second printing mechanism can reciprocate between the receiving side and the working side.

7. The packaging bag printing method according to claim 6, characterized in that: The printing device also includes a second electrostatic rod, which is arranged on the adjacent side of the second printing mechanism, so that the second electrostatic rod can remove static electricity on the surface of the packaging bag again.

8. The packaging bag printing method according to claim 7, characterized in that: The printing equipment also includes a second ultraviolet light source, which is arranged on the adjacent side of the second printing mechanism. A material passing rod is arranged between the second ultraviolet light source and the second printing mechanism. Therefore, when the second printing mechanism prints the packaging bag with photocurable ink, the second ultraviolet light source can promote the rapid curing of the ink on the surface of the packaging bag through ultraviolet light irradiation.

9. The packaging bag printing method according to claim 8, characterized in that: In the above-mentioned step S4, after the packaging bag completes printing on one side of the surface, it is turned over to the other side of the surface through a plurality of feeding rods, and is transported to the second electrostatic rod for surface static removal treatment, and then transported to the second printing mechanism; when the equipment is in working state, the second printing mechanism moves to the working side relative to the partition wall, and at this time, the packaging bag is printed on the other side of the surface through the second printing mechanism; after the printing on the other side is completed, the packaging bag is transported to the second ultraviolet light source through the feeding rod for surface ink photocuring treatment.

10. The packaging bag printing method according to claim 9, characterized in that: The printing device also includes a second traction shaft, which is arranged on the adjacent side of the second ultraviolet light source. The packaging bag that has completed the second light curing treatment is turned over again under the traction of the second traction shaft and transported toward the unloading end.

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