Device for three-dimensionally coating corrugated cardboard

Abstract

In order to enable a corrugated cardboard having improved waterproofing and strength to be mass-produced by coating in which a coating solution is evenly and rapidly impregnated and suctioned into not only both outer surfaces of a corrugated cardboard but also inner surfaces and a corrugated core thereof and thus to be used for various uses including a box, the invention provides a device (100) for three-dimensionally coating a corrugated cardboard, in which when a corrugated cardboard (10) is passed through a lower suction hole (122) of a container body (120) by a corrugated cardboard conveying part (140), air in a corrugated core (13) of the corrugated cardboard (10) is suctioned into a suction part (130) via an inner space (123) of the container body (120) by a suction pressure of the suction part (130) and atmospheric pressure applied to a coating solution (111); and as the coating solution (111) drawn up during an air suction process is filled from a lower part to an upper part of the corrugated core (13), a front surface paper and a back surface paper (11) of the corrugated cardboard (10) and all surfaces of a corrugated core paper (12) are evenly and rapidly coated.

Description

Corrugated cardboard three-dimensional coating device

[0001] This invention relates to a three-dimensional coating device for corrugated cardboard, and more specifically, to a three-dimensional coating device for corrugated cardboard that impregnates and absorbs the entire outer surfaces of corrugated cardboard as well as the inner surfaces and the corrugation core in a three-dimensional manner, thereby ensuring waterproofing, which is the biggest drawback of corrugated cardboard, while increasing its strength, so that it can be applied to various fields including packaging boxes.

[0002] Figure 1 is a drawing showing the decomposed state of cardboard and the cross-section in the width direction after bonding.

[0003] In general, corrugated cardboard is made of a cardboard-shaped double-faced paper (11) and a corrugated core paper (12) with a wavy shape between them, as shown in Fig. 1, and is manufactured to a predetermined thickness by bonding these together with an adhesive.

[0004] Since this type of cardboard is made of paper, it is weaker in moisture and strength than other materials such as plastic. Therefore, it was proposed to increase the strength and compensate for the weakness of being vulnerable to moisture by impregnating and coating the outer surfaces and inner surfaces and the corrugation core with an impregnating coating solution containing a resin such as polystyrene and then drying it.

[0005] Figure 2 is a drawing showing the state of use of a conventional cardboard impregnation device.

[0006] In Patent Registration No. 10-1850343 (Title of invention: Corrugated cardboard impregnation device), as shown in FIG. 2, a tray (6a) containing cardboard (3) is introduced into an impregnation tank (8) so that the impregnation (4) is evenly impregnated into the cardboard (3), and the trays (6b) (6c) located in the dehydration chamber (9) remain there for a predetermined period of time so that the impregnation (4) applied to the surface of the cardboard (3) and the impregnation (4) that is excessively impregnated fall freely into a lower funnel (19) and are collected into a collection tank (18).

[0007] Figure 3 is a drawing showing a longitudinal cross-section of cardboard.

[0008] However, in Patent Registration No. 10-1850343, there was a problem that, while the outer surfaces of the corrugated cardboard were easily impregnated and coated with a coating liquid, the inner corrugated core (13) formed thin and long in the corrugated cardboard (10) acted as a resistance factor to the flow of the impregnating coating liquid, making it difficult to impregnate and coat up to the corrugated core (13) and also taking a lot of time, as shown in FIG. 3.

[0009] This invention is intended to solve the above problems, and the object of the invention is to provide a three-dimensional coating device for corrugated cardboard that can be used for various purposes including boxes by mass-producing corrugated cardboard with enhanced waterproofness and strength through even and rapid impregnation and absorption coating of a coating liquid not only on both outer surfaces of corrugated cardboard but also on the inner surfaces and corrugation core.

[0010] In order to solve the above problem, this invention comprises: a coating solution tank (110) for accommodating a coating solution (111); a cylinder (120) having an upper discharge port (121) and a lower suction port (122) formed therein, the lower portion of which is immersed in the upper surface of the coating solution tank (110) so that the coating solution (111) is filled to a predetermined height from the lower suction port (122) to form an internal space (123) between the cylinder and the upper discharge port (121); a suction unit (130) connected to the upper discharge port (121) of the cylinder (120) for suctioning the inside of the cylinder (120); And, a cardboard transfer unit (140) for transferring the cardboard (10) into the coating solution tank (110) in a state where the cardboard (10) is formed thin and long with the core (13) maintained vertically and then passes through the lower suction port (122) of the cylinder (120) and then passes out; When the cardboard (10) passes through the lower suction port (122) of the cylinder (120) by the cardboard transfer unit (140), the air in the core (13) of the cardboard (10) is sucked into the suction unit (130) through the internal space (123) of the cylinder (120) by the suction pressure of the suction unit (130) and the atmospheric pressure applied to the coating solution (111), and the coating solution (111) pulled up in the air suction process fills the core (13) from the lower part to the upper part, and the surface of the cardboard (10) A corrugated cardboard three-dimensional coating device (100) is provided, characterized in that all surfaces of the backing paper (11) and the corrugated paper (12) are coated evenly and quickly.

[0011] Preferably, the plurality of the cylinders (120) and suction parts (130) are installed at predetermined intervals along the transport direction of the cardboard (10) in the coating solution tank (110), and when the cardboard (10) passes through each lower suction port (122) by the cardboard transport part (140), the air in the corrugated core (13) of the cardboard (10) can be sucked in by the corresponding suction part (130).

[0012] According to the corrugated cardboard three-dimensional coating device of the present invention having the above-described solution, the lower part of the barrel is immersed in the upper surface of the coating liquid tank, and the coating liquid is filled to a predetermined height from the lower suction port to form an internal space between the lower suction port and the upper discharge port, and as the corrugated cardboard with the corrugations maintained vertically passes through the lower suction port of the barrel, the air in the corrugations is sucked into the suction port through the internal space of the barrel by the suction pressure of the suction port and the atmospheric pressure applied to the coating liquid, so that the coating liquid pulled up in the air suction process is filled from the lower part of the corrugations to the upper part, and all surfaces of the front side, back side, and corrugated cardboard are evenly and quickly coated, thereby achieving the effect of securing competitiveness through mass production of high-quality products with enhanced waterproofing and strength.

[0013] In addition, by installing a plurality of bodies and suction units at a predetermined interval along the direction of conveyance of the cardboard in the coating solution tank, when the cardboard passes through each lower suction port by the cardboard conveyance unit, only the air in the corrugated cardboard's corrugated core is sucked in by appropriate pressure control in the corresponding suction unit, thereby eliminating the need for a device to separately store and manage the coating solution in the suction unit. In addition, in the process of repeatedly applying suction pressure to the cardboard from the suction unit, the penetration of the coating solution into the internal fiber tissue through the pores is increased, thereby increasing the strength.

[0014] Figure 1 is a drawing showing the disassembled state of cardboard and the cross-section in the width direction after bonding.

[0015] Figure 2 is a drawing showing the state of use of a conventional cardboard impregnation device.

[0016] Figure 3 is a drawing showing a longitudinal cross-section of cardboard,

[0017] Figures 4 and 5 are drawings showing a cardboard three-dimensional coating device according to an embodiment of the present invention from the front and AA sides.

[0018] Figures 6 and 7 are drawings showing the process of coating cardboard while it is being transported in a cardboard three-dimensional coating device according to an embodiment of the present invention, from the front and AA sides.

[0019] FIG. 8 is a drawing showing a case where a plurality of bodies and suction parts are installed at predetermined intervals in a cardboard three-dimensional coating device according to an embodiment of the present invention.

[0020] FIG. 9 is a drawing showing an example of coated cardboard in a cardboard three-dimensional coating device according to an embodiment of the present invention.

[0021] FIG. 10 is a drawing showing a state in which a piece of coated cardboard and a piece of uncoated general cardboard are placed in water and then taken out of a cardboard three-dimensional coating device according to an embodiment of the present invention.

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. This description is intended to facilitate easy implementation by those skilled in the art, but is not intended to limit the technical spirit or scope of the invention. Furthermore, terms used to define relative positions, such as "front-back," "left-right," "up-down," and "inside-out," are based on the accompanying drawings.

[0023] FIGS. 4 and 5 are drawings showing a cardboard three-dimensional coating device according to an embodiment of the present invention from the front and AA sides.

[0024] As shown in FIGS. 4 and 5, the cardboard three-dimensional coating device (100) according to an embodiment of the present invention impregnates and sucks the coating solution (111) so that it can pass evenly and quickly between the corrugated cores (13) inside the cardboard (10) that act as a resistance factor to the flow, thereby coating both surface papers and the back paper (11) of the cardboard (10), and the entire surface papers and corrugated core (13) inside.

[0025] Specifically, the cardboard three-dimensional coating device (100) according to an embodiment of the present invention includes a coating solution tank (110), a body (120), a suction unit (130), and a cardboard conveying unit (140), and can evenly and quickly three-dimensionally coat the entire cardboard (10) formed into a square or specific shape by impregnating and sucking the coating solution (111).

[0026] The coating solution tank (110) is filled with a coating solution (111) so that the entire upper part or part of the upper part is opened, and the cardboard (10) is inserted into the tank while maintaining the core (13) up and down, and is then submerged until it comes out.

[0027] The above coating solution (111) coats the inner and outer surfaces of the surface paper and back paper (11), and the inner corrugated paper (12) to enhance waterproofing and strength of the corrugated cardboard (10).

[0028] The coating solution (111) described above can be applied without limitation to any material that can coat the entire corrugated cardboard (10) for waterproofing and reinforcing strength, including publicly known contents such as Patent Publication No. 10-2018-0021523 (Title of the invention: Corrugated cardboard reinforcing composition and corrugated cardboard impregnated with the reinforcing composition), Patent Registration No. 10-1803777 (Title of the invention: Plywood panel and soundproofing material using the same), Patent Registration No. 10-1850343 (Title of the invention: Corrugated cardboard impregnation device), etc., while adjusting the components and ratio according to the conditions.

[0029] The above-mentioned body (120) is formed with an upper discharge port (121) and a lower suction port (122) in the upper and lower directions, and the lower part is immersed in the upper surface of the coating liquid tank (110) so that the coating liquid (111) is filled to a predetermined height from the lower suction port (122) to form an internal space (123) between the lower part and the upper discharge port (121).

[0030] Here, the lower suction port (122) is formed to wrap around a portion of the upper part of the cardboard (10) in which the long and thin grooves (13) are maintained vertically along the transport direction, so that the air remaining in the grooves (13) of the passing cardboard (10) can be intensively sucked in.

[0031] The above suction unit (130) sucks air in the core (13) of the cardboard (10) through the internal space (123) of the body (120) by means such as a pump or fan.

[0032] The above-mentioned cardboard conveying unit (140) is composed of rollers installed front and rear at predetermined intervals to rotate and convey cardboard (10) therebetween, while maintaining the corrugation core (13) of the cardboard (10) up and down, so that the cardboard (10) enters the interior of the coating solution tank (110) and passes through the lower suction port (122) and is discharged to the outside, a motor that rotates the rollers, a connecting part such as a gear or a tooth that connects the motor and the rollers, and a controller that supplies power to the motor and controls the rotation speed, as known means.

[0033] A detailed description of a cardboard three-dimensional coating device (100) according to an embodiment of the present invention having the above configuration is given below with reference to the attached drawings.

[0034] FIGS. 6 and 7 are drawings showing the process of coating cardboard while it is being transported in a cardboard three-dimensional coating device according to an embodiment of the present invention, from the front and AA sides.

[0035] A cardboard three-dimensional coating device (100) according to an embodiment of the present invention impregnates and absorbs the entire cardboard (10) and coats it three-dimensionally through a process as shown in FIGS. 6 and 7.

[0036] First, as shown in (a) of FIG. 6 and FIG. 7, when the cardboard (10) enters the interior of the coating solution tank (110) filled with the coating solution (111) by the cardboard conveying unit (140), the outer surface paper and the back paper (11) of the cardboard (10) are locked and immediately coated.

[0037] Here, a portion of the air in the core (13) is discharged into the internal space (123) of the body (120) by atmospheric pressure applied to the upper surface of the coating solution (111) except for the portion covered by the body (120) in the coating solution tank (110), and the lower portion of the core (13) corresponding to this is filled with the coating solution (111).

[0038] Next, as shown in (b)(c) of FIG. 6 and FIG. 7, the cardboard (10) that has entered the interior of the coating solution tank (110) passes through the lower suction port (122) of the cylinder (120) while being transported by the cardboard transport section (140).

[0039] At this time, the air in the internal space (123) is sucked in through the upper discharge port (121) in the suction unit (130), and at the same time, the atmospheric pressure applied to the coating liquid (111) is added, so that the air remaining in the core (13) is sucked into the suction unit (130).

[0040] In this air intake process, the coating liquid (111) is drawn up by the air and fills the core (13) from the bottom to the top, so that the entire six sides of the inner and outer surface paper and back paper (11) of the cardboard (10) and the inner core paper (12) are evenly and quickly coated.

[0041] In addition, the coating liquid (111) passes through the pores of the cardboard (10) by the suction pressure and atmospheric pressure, thereby connecting the surface paper and back paper (11) on both inner and outer sides and the entire six sides of the inner corrugated paper (12) to each other, thereby increasing the strength.

[0042] That is, when the suction unit (130) sucks in the air in the internal space (123) of the body (120), the atmospheric pressure applied to the upper surface of the coating solution (111) except for the portion covered by the body (120) in the coating solution tank (110) presses the coating solution (111) downward, so that the air in the corrugated core (13) of the corrugated cardboard (10) passing through the lower suction port (122) of the body (120) by the corrugated cardboard conveying unit (140) can be sucked in evenly and quickly, and the coating solution (111) that is then pulled up passes through the pores as well as the corrugated core (13), thereby producing waterproof and high-strength corrugated cardboard with a good coating on all six sides of the inner and outer surface paper and back paper (11) and the inner corrugated core (12), thereby increasing the competitiveness of the product.

[0043] FIG. 8 is a drawing showing a case where a plurality of body parts and suction parts are installed at predetermined intervals in a cardboard three-dimensional coating device according to an embodiment of the present invention.

[0044] In the cardboard three-dimensional coating device (100) according to an embodiment of the present invention, as shown in FIG. 8, the cylinder (120) and the suction part (130) are installed at predetermined intervals along the transport direction of the cardboard (10) in the coating solution tank (110), and a plurality of them can be installed as needed.

[0045] In the above suction part (130), in order to suck in the air of the corrugated cardboard (10) core (13) passing through the lower suction port (122) of the body (120), when the air of the internal space (123) is sucked in at high pressure through the upper discharge port (121), the coating liquid (111) that is then pulled up can fill the entire core (13) and be sucked in through the internal space (123).

[0046] In this case, the suction unit (130) must be equipped with a separate device for storing and managing the coating liquid (111), and to prevent this, the pressure must be adjusted low enough to allow only air to be sucked in.

[0047] For example, by controlling the suction pressure so that the coating liquid (111) is filled up to the middle of the groove (13) in one suction part (130) and the coating liquid (111) is completely filled in the groove (13) that is filled up to the middle in the other suction part (130), the suction part (130) can be provided without a separate device for storing and managing the coating liquid (111).

[0048] In addition, by repeating the process of applying pressure to the cardboard (10) equally from each suction section (130), the strength can be increased by allowing the coating solution (111) to penetrate into the internal fiber tissue through the pores.

[0049] FIG. 9 is a drawing showing an example of coated cardboard in a cardboard three-dimensional coating device according to an embodiment of the present invention, and FIG. 10 is a drawing showing a state in which a piece of coated cardboard and an uncoated general cardboard are placed in water and taken out in a cardboard three-dimensional coating device according to an embodiment of the present invention.

[0050] In the cardboard three-dimensional coating device (100) according to an embodiment of the present invention, the coated cardboard (10') forms a coating layer (20) that three-dimensionally coats not only the outer surfaces but also the inner corrugation and the inner corrugation on all six sides, as shown in FIG. 9, and after the even and rapid coating of the cardboard (10), the coating liquid on the inner and outer surfaces, the back surface, and the inner corrugation is removed and heat-dried to complete the coating, thereby enabling mass production of cardboard with increased strength while ensuring waterproofing, which is the biggest drawback, as shown in FIG. 10.

[0051] This invention is not limited to the above embodiments, and various modifications are possible within the scope of the invention described in the claims, and such modifications are also included within the scope of this invention.

[0052] In the corrugated cardboard three-dimensional coating device of the present invention, air in the corrugation is sucked into the suction unit through the internal space of the body by the suction pressure of the suction unit and the atmospheric pressure applied to the coating liquid, and the coating liquid drawn up in this process fills the corrugation from the bottom to the top, so that the front and back sides of the corrugation and all sides of the corrugation are evenly and quickly coated, enabling mass production of high-quality products with improved waterproofing and strength.

Claims

1. A coating solution tank (110) containing a coating solution (111); A cylinder (120) having an upper discharge port (121) and a lower suction port (122) formed, and a lower portion immersed in the upper surface of the coating liquid tank (110) so that the coating liquid (111) is filled to a predetermined height from the lower suction port (122) to form an internal space (123) between the cylinder and the upper discharge port (121); A suction unit (130) connected to the upper discharge port (121) of the above body (120) and sucking the inside of the body (120); and, It includes a cardboard transport unit (140) that transports cardboard (10) formed in a thin and long groove (13) in the interior of the coating solution tank (110) so that it enters in a state of being maintained vertically and passes through the lower suction port (122) of the body (120) and then goes out to the outside; A cardboard three-dimensional coating device (100) characterized in that when the cardboard (10) passes through the lower suction port (122) of the body (120) by the cardboard conveying unit (140), the air in the core (13) of the cardboard (10) is sucked into the suction unit (130) through the internal space (123) of the body (120) by the suction pressure of the suction unit (130) and the atmospheric pressure applied to the coating liquid (111), and the coating liquid (111) drawn up during the air suction process fills the core (13) from the lower part to the upper part, thereby evenly and quickly coating all surfaces of the front side, back side (11) and core (12) of the cardboard (10).

2. In paragraph 1, In the above coating solution tank (110), the above cylinder (120) and suction part (130) are installed in multiple numbers at a predetermined interval along the transport direction of the above cardboard (10), A cardboard three-dimensional coating device (100) characterized in that when the cardboard (10) passes through each lower suction port (122) by the cardboard conveying portion (140), air in the corrugated core (13) of the cardboard (10) is sucked in by the corresponding suction portion (130).

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