Low-carbon paper flexible packaging bag coating device

Abstract

The utility model discloses a low-carbon type paper flexible packaging bag coating device, which belongs to the technical field of packaging and comprises two coating components symmetrically arranged on one side of the front surface and one side of the back surface of a paper material belt, the coating assembly comprises a coating roller, a reticulate pattern roller, a cavity type doctor blade and a pressing mechanism. The pressing mechanism is used for driving the coating roller to be close to or away from the paper material belt and used for driving the coating roller to be close to or away from the reticulate pattern roller. The two coating components are arranged at the same position in the conveying direction of the paper material belt, so that the length of the material belt required by starting up is reduced, and the waste of paper is reduced; and the two coating rollers can borrow force mutually, so that an extrusion roller is omitted, and the structural complexity and the size of the device are reduced. According to the paper packaging bag provided by the utility model, the coating area comprises the folding area and the seal sticking area, so that the use of heat-sealing gloss oil in the production process is greatly reduced under the action of not influencing the firmness strength of the paper packaging bag, and the production process is lower in carbon and more environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to a low-carbon paper soft packaging bag coating device. Background Art

[0002] As a disposable daily necessity, paper towels have a very broad market space. According to data surveys, the total size of the toilet paper market has increased year by year. The market size in the first quarter of 2019 was 8 billion, and it is expected that the annual toilet paper market size in 2025 will reach more than 100 billion.

[0003] At present, most paper towels on the market are packaged in plastic. However, as people's environmental awareness continues to increase, the requirements for toilet paper outer packaging are also getting higher and higher.

[0004] Based on this, it is necessary to use degradable paper materials as soft packaging for products such as tissues, playing cards, and medicines. Compared with traditional plastic flexible packaging, using paper as packaging material is not only more environmentally friendly, but also does not change the process and equipment of downstream tissue manufacturers when packaging tissues.

[0005] Paper flexible packaging materials need to be folded and adhered to form when packaging items. Therefore, the front and back of the paper flexible packaging materials need to be coated with heat-sealing varnish in advance. In this regard, the coating production line in the prior art needs to be arranged with two sets of coating equipment to respectively perform large-area coating on the front and back of the paper flexible packaging materials, resulting in a huge waste of heat-sealing varnish; and since the coating equipment is large in size, the two sets of coating equipment need to be arranged at intervals along the coating production line, resulting in a larger footprint of the production line, and thus the material strip located between the two sets of coating equipment cannot be used when the machine is turned on, resulting in waste of the material strip.

[0006] Based on this, it is necessary to design a coating device with a simpler and more compact structure to achieve coating operations on the front and back sides of paper packaging bag materials. Utility Model Content

[0007] In view of the problems in the prior art that the coating production line has a complicated structure and a large volume, and that the heat-sealing varnish is wasted due to the large coating area, the purpose of the utility model is to provide a low-carbon paper flexible packaging bag coating device so as to at least partially solve the above problems.

[0008] To achieve the above purpose, the technical solution of the utility model is:

[0009] A low-carbon paper flexible packaging bag coating device, comprising two coating components symmetrically arranged on the front and back sides of a paper material strip; the coating component comprises a coating roller, an anilox roller, a chambered ink scraper and a pressing mechanism, the pressing mechanism is used to drive the coating roller to approach or move away from the paper material strip and to drive the coating roller to approach or move away from the anilox roller;

[0010] Among them, a printing plate is arranged on the coating roller, and the printing plate includes a plurality of printing units adapted to the paper flexible packaging bag, and the printing unit includes a packaging area located in the middle part and two sealing areas respectively located on both sides and symmetrically arranged with respect to the packaging area; the packaging area includes a first sub-side surface, a front surface, a second side surface, a bottom surface and a second sub-side surface connected in sequence, and folding areas are arranged at the two end points where the first sub-side surface is connected to the front surface, the two end points where the front surface is connected to the second side surface, the two end points where the second side surface is connected to the bottom surface, and the two end points where the bottom surface is connected to the second sub-side surface, and the folding areas are located in the sealing area; an end of the first sub-side surface away from the front surface, an end of the second sub-side surface away from the bottom surface, and each of the folding areas are coating areas; a pasting area is arranged in each of the two sealing areas, and the two pasting areas are symmetrically arranged with respect to the bottom surface, and the pasting areas are both coating areas.

[0011] In a preferred embodiment, the coating assembly includes a coating bracket, the anilox roller is fixedly mounted on the coating bracket, the coating roller is slidably mounted on the coating bracket, and the clamping mechanism includes a first driving mechanism connected between the coating roller and the coating bracket.

[0012] In a preferred embodiment, there is an inclined angle between the sliding direction of the coating roller and the conveying direction of the paper material strip, and when the coating roller slides to a position contacting the paper material strip, the coating roller also contacts the anilox roller at the same time.

[0013] In a preferred embodiment, the two coating brackets are arranged to slide relative to each other, and the clamping mechanism further includes a second driving mechanism connected between the two coating brackets.

[0014] In a preferred embodiment, the sliding direction of the coating roller and the sliding direction of the coating bracket are both perpendicular to the conveying direction of the paper material strip.

[0015] In a preferred embodiment, it further comprises a tensioning roller and a tensioning driving mechanism for driving the tensioning roller, wherein the tensioning roller is arranged on the upstream side of the coating assembly along the conveying direction of the paper strip.

[0016] In a preferred embodiment, the diameter of the coating cylinder is the same as the diameter of the anilox cylinder.

[0017] In a preferred embodiment, a drying device is further included, and the drying device is arranged on the downstream side of the coating component along the conveying direction of the paper material strip.

[0018] In a preferred embodiment, the paper flexible packaging bag is a tissue packaging bag or a sheet packaging bag.

[0019] In a preferred embodiment, it further comprises a guide roller, the surface of which is coated with a coating to prevent adhesion when in contact with a paper material strip coated with heat-sealing varnish.

[0020] In a preferred embodiment, the surface of the guide roller is pre-coated with a coating. By adopting the above technical solution, the beneficial effect of the utility model is that compared with the traditional technology, the two coating components in the low-carbon paper packaging bag coating device provided by the embodiment of the utility model are arranged at the same position in the conveying direction of the paper material belt, thereby reducing the device's requirements for the unfolding length of the paper material belt, reducing the length of the material belt required for startup, and reducing paper waste. In addition, when the coating device provided by this embodiment is used, the coating rollers in the two coating components can leverage each other, thereby eliminating the need for an extrusion roller, further reducing the structural complexity and volume of the device. In addition, the printing unit in the printing plate arranged on the coating roller only needs to be coated in the folding area and the sealing and pasting area, thereby greatly reducing the use of heat-sealing varnish in the production process without affecting the firmness of the paper-to-paper flexible packaging bag, making the production process more low-carbon and environmentally friendly. Finally, due to the setting of the slidable coating roller, the coating roller can synchronously approach or move away from the anilox roller and the paper material strip, so that other components in the coating assembly do not need to move during equipment debugging and coating, which further reduces the structural complexity and control difficulty of the coating assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model.

[0022] Figure 2 It is a schematic diagram of the expansion of the paper packaging bag (or the printing area in the printing plate) in the utility model.

[0023] Figure 3 It is a schematic diagram of the expansion when the three printing units in the printing plate are arranged in sequence.

[0024] Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0025] Figure 5 This is a schematic diagram of the structure of the third embodiment of the present invention.

[0026] In the figure: 1-paper material belt, 2-tensioning roller, 3-tensioning drive mechanism, 4-coating roller, 5-anilox roller, 6-chambered doctor blade, 7-coating bracket, 8-first drive mechanism, 9-printing plate, 10-drying equipment, 11-guide roller, 12-second drive mechanism. DETAILED DESCRIPTION

[0027] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the description of the structure of the present invention as shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] The "first" and "second" in this technical solution are only used to distinguish the names of the same or similar structures, or corresponding structures with similar functions, and are not an arrangement of the importance of these structures, nor do they have a ranking, comparison of size, or other meanings.

[0030] In addition, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, the connection 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, or it can be a connection between the two structures. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood based on the overall idea of ​​the utility model and the specific context of the scheme.

[0031] Embodiment 1

[0032] A low-carbon paper flexible packaging bag coating device, such as Figure 1 As shown, it includes a tensioning roller 2, a coating component and a drying device which are arranged in sequence along the conveying direction of the paper material strip 1.

[0033] The tensioning roller 2 is equipped with a tensioning drive mechanism 3 for driving it to apply a larger or smaller tensioning force to the paper web, such as a linear drive mechanism such as a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

[0034] There are two coating assemblies which are symmetrically arranged on the front and back sides of the paper strip, that is, the two coating assemblies are arranged at the same position in the conveying direction of the paper strip. In this embodiment, the coating assembly specifically includes a coating roller 4, an anilox roller 5, a chambered ink scraper 6, a clamping mechanism and a coating bracket 7.

[0035] The coating bracket 7 is usually fixedly installed relative to the ground. Two coaxially arranged anilox bearing seats are fixed on the coating bracket 7, and the two ends of the anilox roller 5 are respectively connected to the two anilox bearing seats by bearings, so that the anilox roller 5 can rotate on the coating bracket 7. In addition, two coating bearing seats are also slidably connected to the coating bracket 7, and the two ends of the coating roller 4 are respectively connected to the two coating bearing seats by bearings, so that the coating roller 4 can rotate relative to the coating bracket 7 and slide on the coating bracket 7. The coating roller 4 is also equipped with a motor (not shown in the figure) for driving its rotation, and the motor is fixedly installed on one of the coating bearing seats through a motor frame. The chambered scraper 6 is fixedly installed on the coating bracket 7, and the chambered scraper 6 is connected to a pipeline for conveying heat-sealing varnish to it, so that the chambered scraper 6 can apply the heat-sealing varnish on the anilox roller 5.

[0036] The rotation axes of the anilox roller 5 and the coating roller 4 are parallel to each other and aligned, and the rotation axes of the anilox roller 5 and the coating roller 4 are perpendicular to the conveying direction of the paper strip, and the rotation axes of the anilox roller 5 and the coating roller 4 are also parallel to the plane where the paper strip is located. Usually, the diameter of the coating roller 4 (including the printing plate 9 arranged on its surface) is the same as the diameter of the anilox roller 5.

[0037] In this embodiment, there is an inclined angle between the sliding direction of the coating roller 4 and the conveying direction of the adjacent paper material strip 1, and when the coating roller 4 slides to the position contacting the paper material strip 1, the coating roller 4 also contacts the anilox roller 5 at the same time. That is, when the coating assembly is in the coating operation state, the two coating rollers 4 and the two anilox rollers 5 are arranged in a V shape as a whole.

[0038] In addition, each coating roller 4 is provided with a clamping mechanism for driving it to slide relative to the coating bracket 7, such as a first driving mechanism 8, such as a linear driving mechanism such as a cylinder, an electric cylinder or a hydraulic cylinder. The first driving mechanism 8 is used to drive the coating roller 4 to approach the paper material strip 1 and the anilox roller 5 at the same time, or the first driving mechanism 8 is used to drive the coating roller 4 to move away from the paper material strip 1 and the anilox roller 5 at the same time. Moreover, when the first driving mechanism 8 drives the coating roller 4 to approach and contact the paper material strip 1, the coating roller 4 also contacts the anilox roller 5 at the same time. In this way, when the coating roller 4 rotates driven by the motor equipped therewith, the coating roller 4 drives the anilox roller 5 to rotate, thereby transferring the heat-sealing varnish on the anilox roller 5 to the coating roller 4, and the coating roller 4 carrying the heat-sealing varnish can apply the heat-sealing varnish to the paper material strip 1.

[0039] The drying device 10 is configured as a drying box, and an entrance and exit are opened at its two opposite ends. The drying device 10 has two groups of heat sources for drying the front and back sides of the paper material strip respectively. The heat source can be a hot air drying heat source composed of a fan and an electric heating wire, or an infrared heating drying heat source composed of an infrared lamp.

[0040] In this embodiment, the paper packaging bag is a tissue packaging bag or a thin sheet packaging bag, such as Figure 2 As shown, it is used to package a plurality of folded and sequentially stacked paper towels, and the paper towel packaging bag includes a packaging area located in the middle part and two side parts (i.e. Figure 2 The packaging area includes two sealing areas (on the left and right sides) and arranged symmetrically with respect to the packaging area.

[0041] Among them, the packaging area includes a first sub-side surface, a front surface, a second side surface, a bottom surface and a second sub-side surface which are connected in sequence from top to bottom. During packaging, an end of the first sub-side surface away from the front surface is connected to an end of the second sub-side surface away from the bottom surface, so that the packaging area encloses the front surface, the bottom surface and two side surfaces of the paper towel packaging bag.

[0042] Figure 2 In the embodiment, the first phase connection line is formed at the junction between the first sub-side surface and the front surface, and the first phase connection line forms two endpoints in the two sealing areas, respectively, which are called first endpoints; correspondingly, the second phase connection line is formed at the junction between the front surface and the second side surface, and the second phase connection line forms two second endpoints in the two sealing areas, respectively; the third phase connection line is formed at the junction between the second side surface and the bottom surface, and the third phase connection line forms two third endpoints in the two sealing areas, respectively; the fourth phase connection line is formed at the junction between the bottom surface and the second sub-side surface, and the fourth phase connection line forms two fourth endpoints in the two sealing areas, respectively.

[0043] Among them, folding areas are provided at the first endpoint, the second endpoint, the third endpoint and the fourth endpoint, and the folding areas are located in adjacent sealing areas. The folding area is in a triangular shape, and each endpoint is one of the vertices of the folding area; for each folding area, it is surrounded by two crease lines passing through the endpoints and the edge line of the tissue packaging bag, and a third crease line passing through the endpoint is also provided inside the folding area. These folding areas are all coating areas that need to be coated with heat-sealing varnish, that is, when the coating device provided in this embodiment is working, the two coating components respectively apply heat-sealing varnish to the position on the front side of the tissue packaging bag opposite to each folding area and the position on the back side of the tissue packaging bag opposite to each folding area. It is easy to understand that the width dimension of the second side ( Figure 2 Therefore, the folding area at the second endpoint will partially overlap with the folding area at the third endpoint, but it does not affect the coating. During coating, you only need to coat the total area of ​​the two folding areas with overlapping parts.

[0044] The end of the first sub-side surface away from the front surface and the end of the second sub-side surface away from the bottom surface are also provided with a coating area that needs to be coated with heat-sealing varnish. The coating area here is long and along Figure 2 It is easy to understand that the width of the first sub-side surface ( Figure 2 The width of the first end point (in the vertical direction) and the second sub-side surface is not necessarily fixed or the same, and the two can be easily connected. This makes the folding area at the first end point or the folding area at the second end point may be missing a corner, such as Figure 2 As shown in the lower left and lower right corners, this does not affect folding and pasting. In addition, both sealing areas are provided with pasting areas that need to be coated with heat-sealing varnish, and the two sealing pasting areas are arranged symmetrically with respect to the bottom surface.

[0045] Correspondingly, the printing plate 9 on the surface of the coating roller 4 and the printing unit for printing the heat-sealing varnish arranged on the printing plate 9 are connected with Figure 2The printing unit is adapted to the paper towel packaging bag (front or back). That is, the printing unit also includes a packaging area located in the middle and two sealing areas located on both sides respectively. The packaging area also includes a first sub-side, a front, a second side, a bottom and a second sub-side. Folding areas are provided at the two end points where the first sub-side connects with the front, the two end points where the front connects with the second side, the two end points where the second side connects with the bottom, and the two end points where the bottom connects with the second sub-side. The folding areas are located in the sealing area. The difference is that there is no need to set crease lines in the folding area in the printing unit. Similarly, one end of the first sub-side away from the front, one end of the second sub-side away from the bottom, and each folding area are configured as coating areas; both sealing areas are provided with pasting areas, and the two pasting areas are arranged symmetrically with respect to the bottom, and both pasting areas are coating areas.

[0046] It can be seen that when the coating device provided in the embodiment of the utility model is working, it is only necessary to apply the heat-sealing varnish to a local position in the paper flexible packaging bag, thereby saving the amount of heat-sealing varnish used and making the coating process more low-carbon and environmentally friendly.

[0047] It is also easy to understand that, since the size of the tissue packaging bag is usually small, the paper strip 1 can usually be cut into more than one tissue packaging bag along its width direction, for example, three. Figure 3 As shown. Accordingly, the printing plate 9 can simultaneously apply heat-sealing varnish to three tissue packaging bags on the paper material strip 1. In addition, since the diameter of the printing plate 9 is relatively large, the printing units on the surface of the printing plate 9 that are adapted to a single tissue packaging bag are not only arranged three times in an axial direction of the coating roller 4, but also arranged several times in a circumferential direction of the coating roller 4, and the specific number is determined according to the diameter of the coating roller 4.

[0048] It is easy to understand that in order to further reduce the floor space, in this embodiment, two guide rollers 11 are also configured for the coating device. The two guide rollers 11 are respectively arranged on the upstream side and the downstream side of the coating assembly. The guide roller 11 located on the upstream side of the coating assembly is used to convert the paper material belt conveyed in the horizontal direction into the vertical direction, and the guide roller 11 located on the downstream side of the coating assembly is used to convert the paper material belt conveyed in the vertical direction into the horizontal direction, that is, to return to the incoming material of the paper material belt 1. The above-mentioned tensioning roller 2 is arranged on the upstream side of the coating assembly and is also located in the vertical conveying section of the paper material belt 1. The drying device 10 is arranged on the downstream side of the coating assembly and is also located in the horizontal conveying section of the paper material belt 1.

[0049] It is easy to understand that the surface of the guide roller 11 is coated with a coating to prevent adhesion when contacting with the paper material strip coated with heat-sealing varnish, especially the guide roller 11 located on the downstream side of the coating assembly. The coating material can be paraffin or dried water-based wear-resistant varnish.

[0050] The working process of the low-carbon paper packaging bag coating device provided by the embodiment of the utility model is as follows:

[0051] When in use, the paper strip 1 is conveyed along a path defined by the guide roller 11 driven by the unwinding roller (not shown in the figure) and the winding roller (not shown in the figure), and the tension is adjusted by the tension roller 2; the heat-sealing varnish is conveyed to the chamber-type ink scraper 6 through a pipeline; when the paper strip 1 needs to be coated, the first drive mechanisms 8 assigned to the two coating assemblies are simultaneously actuated to move the coating roller 4 to a position where it simultaneously contacts the anilox roller 5 and the paper strip 1, at which point the two coating rollers 4 contact the paper strip 1 from both the front and back sides, and the two The coating roller 4 can also apply a certain pressing force to the paper strip 1 from both sides; then the two coating rollers 4 are driven by the motors they are equipped with to rotate, and the corresponding paper strip 1 is also conveyed synchronously. The conveying speed of the paper strip 1 is the same as the linear speed of the printing plate 9 on the coating roller 4. At this time, the two coating rollers 4 respectively drive the two anilox rollers 5 to rotate, so that the heat-sealing varnish is transferred to the paper strip 1 along the path of the chambered scraper 6, the anilox roller 5, and the coating roller 4, so as to realize the heat-sealing varnish coating of the paper strip 1 from both sides at the same time.

[0052] Compared with the conventional technology, the two coating components in the low-carbon paper packaging bag coating device provided by the embodiment of the utility model are arranged at the same position in the conveying direction of the paper material strip, so that there is no redundant paper material strip between the two coating components, thereby reducing the length of the paper material strip required for startup. In addition, when the coating device provided by the present embodiment is used, the coating rollers in the two coating components can leverage each other, thereby eliminating the need for an extrusion roller, further reducing the structural complexity and volume of the device. Finally, due to the provision of the slidable coating roller, the coating roller can synchronously approach or move away from the anilox roller and the paper material strip, so that other components in the coating component do not need to move during equipment debugging and coating, which further reduces the structural complexity and control difficulty of the coating component.

[0053] Embodiment 2

[0054] In this embodiment, on the basis of the first embodiment, two coating brackets 7 are arranged to slide relative to each other. For example, both are connected to the ground in a sliding manner. The sliding direction of the coating bracket 7 is suitable for making the coating roller 4 mounted thereon approach or move away from the paper material strip 1. For example, the coating bracket 7 is configured to slide in a horizontal direction, that is, perpendicular to the paper material strip 1 at an adjacent position.

[0055] The clamping mechanism further includes a second driving mechanism 12 connected between the two coating brackets 7. Usually, the second driving mechanism 12 is suitable for making the two coating brackets 7 move synchronously when working, so that when the second driving mechanism 12 drives the two coating brackets 7 to approach each other, the coating rollers 4 carried on the two coating brackets 7 will contact the front and back sides of the paper material strip 1 at the same time. For example, the second driving mechanism 12 is configured as a bidirectional screw driven by a motor, the motor and the bidirectional screw are installed on the ground, and the positive and negative threads of the bidirectional screw are respectively installed with nuts, and the two nuts are respectively fixedly connected to the two coating brackets 7, so that when the motor in the second driving mechanism 12 rotates, it can drive the two coating brackets 7 to approach or move away from each other at the same speed.

[0056] The sliding direction of the coating roller 4 on the coating bracket 7 may not be adjusted in this embodiment, and the configuration of the first embodiment is used. Figure 4 shown.

[0057] Before use, the motor in the second drive mechanism 12 rotates forward, driving the two coating brackets 7 away from each other; when coating is required, the coating roller 4 is first driven by the first drive mechanism 8 to approach the anilox roller 5, and then the motor associated with the coating roller 4 is started to make the coating roller 4 and the anilox roller 5 rotate relative to each other, thereby transferring the heat-sealing varnish to the printing plate 9 on the surface of the coating roller 4; then the motor in the second drive mechanism 12 rotates in the opposite direction, driving the two coating brackets 7 to approach each other, until the two coating rollers 4 are in contact with and squeezed on the front and back sides of the paper strip 1 at the same time, and at the same time, the paper strip 1 also starts to convey, so that the heat-sealing varnish on the two coating rollers 4 can be continuously coated on the front and back sides of the paper strip 1.

[0058] After coating, the motor in the second drive mechanism 12 first rotates forward to drive the two coating brackets 7 away from each other, and then stops the coating roller 4 and the paper material strip 1 from being transported. At the same time, the first drive mechanism 8 drives the coating roller 4 and the anilox roller 5 away from each other.

[0059] Embodiment 3

[0060] On the basis of the second embodiment, the present embodiment further configures the sliding direction of the coating roller 4 on the coating bracket 7 to be horizontal, that is, the sliding direction of the coating roller 4 is parallel to the sliding direction of the coating bracket 7, that is, the two coating rollers 4 and the two anilox rollers 5 are arranged in a straight line, such as Figure 5 shown.

[0061] Such an arrangement enables the direction of the extrusion force applied by the two coating rollers 4 to be parallel to the force application direction of the second drive mechanism 12 , thereby reducing the power requirement for the second drive mechanism 12 .

[0062] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A low-carbon paper flexible packaging bag coating device, characterized in that: The invention comprises two coating assemblies symmetrically arranged on the front and back sides of the paper material strip; the coating assembly comprises a coating roller, an anilox roller, a chambered ink scraper and a pressing mechanism, wherein the pressing mechanism is used to drive the coating roller to approach or move away from the paper material strip and to drive the coating roller to approach or move away from the anilox roller; Among them, a printing plate is arranged on the coating roller, and the printing plate includes a plurality of printing units adapted to the paper flexible packaging bag, and the printing unit includes a packaging area located in the middle part and two sealing areas respectively located on both sides and symmetrically arranged with respect to the packaging area; the packaging area includes a first sub-side surface, a front surface, a second side surface, a bottom surface and a second sub-side surface connected in sequence, and folding areas are arranged at the two end points where the first sub-side surface is connected to the front surface, the two end points where the front surface is connected to the second side surface, the two end points where the second side surface is connected to the bottom surface, and the two end points where the bottom surface is connected to the second sub-side surface, and the folding areas are located in the sealing area; an end of the first sub-side surface away from the front surface, an end of the second sub-side surface away from the bottom surface, and each of the folding areas are coating areas; a pasting area is arranged in each of the two sealing areas, and the two pasting areas are symmetrically arranged with respect to the bottom surface, and the pasting areas are both coating areas.

2. The low-carbon paper flexible packaging bag coating device according to claim 1 is characterized in that: The coating assembly comprises a coating bracket, the anilox roller is fixedly mounted on the coating bracket, the coating roller is slidably mounted on the coating bracket, and the clamping mechanism comprises a first driving mechanism connected between the coating roller and the coating bracket.

3. The low-carbon paper flexible packaging bag coating device according to claim 2 is characterized in that: There is an inclined angle between the sliding direction of the coating roller and the conveying direction of the paper material strip, and when the coating roller slides to a position contacting the paper material strip, the coating roller also contacts the anilox roller at the same time.

4. The low-carbon paper flexible packaging bag coating device according to claim 2 is characterized in that: The two coating brackets are arranged to slide relative to each other, and the clamping mechanism further includes a second driving mechanism connected between the two coating brackets.

5. The low-carbon paper flexible packaging bag coating device according to claim 4 is characterized in that: The sliding direction of the coating roller and the sliding direction of the coating bracket are both perpendicular to the conveying direction of the paper material strip.

6. The low-carbon paper flexible packaging bag coating device according to claim 1 is characterized in that: It also includes a tensioning roller and a tensioning driving mechanism for driving the tensioning roller. The tensioning roller is arranged on the upstream side of the coating component along the conveying direction of the paper material strip.

7. The low-carbon paper flexible packaging bag coating device according to claim 1 is characterized in that: The diameter of the coating cylinder is the same as the diameter of the anilox cylinder.

8. The low-carbon paper flexible packaging bag coating device according to claim 1 is characterized in that: It also includes a drying device, which is arranged on the downstream side of the coating component along the conveying direction of the paper material strip.

9. The low-carbon paper flexible packaging bag coating device according to claim 1, characterized in that: The paper soft packaging bag is a tissue packaging bag or a sheet packaging bag.

10. The low-carbon paper flexible packaging bag coating device according to claim 1, characterized in that: The invention also comprises a guide roller, the surface of which is coated with a coating so as to avoid adhesion when the guide roller contacts with a paper material strip coated with heat-sealing varnish.

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