Damp-proof kraft liner board for packaging and preparation device thereof

Abstract

The invention discloses a damp-proof kraft box paperboard for packaging and a preparation device thereof, and relates to the technical field of paperboard production, the paperboard comprises a paperboard body and an outer-layer covering film, the outer-layer covering film is completely closed on the four sides of the paperboard body, and sealant is arranged between the inner side of the edge of the outer-layer covering film and the four sides of the paperboard body. The preparation device comprises a first conveying belt mechanism, a front-back edge grinding mechanism, a left-right edge grinding mechanism, a film covering mechanism, a front-back edge pressing mechanism, two side edge pressing wheels, a second conveying belt mechanism and a cutting mechanism, the front-back edge grinding mechanism is arranged on the upper portion of the first conveying belt mechanism, and the left-right edge grinding mechanism is arranged on the two sides of the first conveying belt mechanism; the film covering mechanism is arranged at the tail end of the first conveying belt mechanism, the front-back edge pressing mechanism is arranged on the film covering mechanism, and the second conveying belt mechanism is arranged on the rear side of the film covering mechanism. The waterproof performance of paperboards is improved, and by optimizing mechanical structures such as edge grinding, film covering, edge pressing and cutting, automatic production is achieved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of paperboard production, in particular to a moisture-proof kraft liner paperboard for packaging and a preparation device thereof. Background Art

[0002] In the packaging industry, kraft linerboard is widely used for packaging of various items due to its high strength, low cost, and easy processing. However, traditional kraft linerboard has obvious deficiencies in moisture resistance, especially in environments with high humidity. The carton is easily deformed by moisture, and even the items inside are damaged. In order to improve the moisture resistance of kraft linerboard, the industry usually applies moisture-proof coating or lamination on the surface of the cardboard.

[0003] At present, the moisture-proof kraft paperboard commonly seen on the market mainly achieves moisture-proof effect by coating a layer of moisture-proof coating on the surface of the paperboard. However, the moisture-proof effect of this method is limited, and the use of coating increases production costs and environmental pollution. Another method is to use laminating technology, that is, to cover a layer of plastic film on the surface of the paperboard, and fix the film on the paperboard by hot pressing or gluing. Although this method improves the moisture-proof performance to a certain extent, there are problems such as uneven laminating and easy falling off of corners, especially at the corners of the paperboard, because it is difficult to fit completely, the moisture-proof effect is greatly reduced.

[0004] In the process of preparing moisture-proof kraft linerboard, the existing production equipment still has some shortcomings. For example, the edge grinding mechanism can usually only grind one side of the cardboard, and the cardboard needs to be turned over many times to complete the edge grinding of the four sides, which not only reduces production efficiency but also increases the difficulty of operation. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a moisture-proof kraft linerboard for packaging and a preparation device thereof, aiming to significantly improve the moisture-proof performance and production efficiency of the paperboard by optimizing the mechanical structure of edge grinding and lamination and improving the degree of automation.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A moisture-proof kraft liner board for packaging, characterized in that it comprises a board body and an outer coating, wherein the outer coating is completely closed on four sides of the board body and sealant is provided between the inner side of the edge of the outer coating and the four sides of the board body.

[0008] It includes a first conveyor belt mechanism, front and rear edge grinding mechanisms, left and right edge grinding mechanisms, a laminating mechanism, front and rear edge pressing mechanisms, edge pressing wheels on both sides, a second conveyor belt mechanism and a cutting mechanism, wherein the front and rear edge grinding mechanisms are arranged on the upper part of the first conveyor belt mechanism, the left and right edge grinding mechanisms are arranged on both sides of the first conveyor belt mechanism, the laminating mechanism is arranged at the end of the first conveyor belt mechanism, the front and rear edge pressing mechanisms are arranged on the laminating mechanism, the second conveyor belt mechanism is arranged at the rear side of the laminating mechanism, the edge pressing wheels on both sides are arranged on both sides of the second conveyor belt mechanism, and the cutting mechanism is arranged on the second conveyor belt mechanism and is located at the rear side of the edge pressing wheels on both sides;

[0009] The first conveyor belt mechanism includes a plurality of connecting plates, and a carrying belt is fixedly arranged between adjacent connecting plates. The connecting plates and the carrying belt are connected end to end to form a conveyor belt and are driven by a transmission motor and arranged on a conveyor belt bracket. The connecting plates are provided with through grooves penetrating to both ends of the connecting plates, and a lifting partition is slidably arranged on the inner side of the through groove. Both ends of the lifting partition extend to both sides of the carrying belt, and the lengths of the two ends of the lifting partition extending to both sides of the carrying belt are different and adjacent lifting partitions are arranged alternately. Springs are arranged between the lower parts of the two ends of the lifting partition and the inner sides of the two ends of the through groove, and a blocking slider is arranged on the upper side of the lifting partition, and grooves are symmetrically arranged on both sides of the conveyor belt bracket;

[0010] The front and rear edge grinding mechanism includes a fixed frame mounted on the upper part of both sides of the conveyor belt bracket, a sliding plate is slidably provided on the upper part of the fixed frame, a T-slot transverse slide rail is fixedly provided at the bottom of the sliding plate, a motor seat is slidably provided at the lower part of the T-slot transverse slide rail through a T-slot slider, a mobile motor is fixedly provided on the motor seat, a rack is fixedly provided on the side of the T-slot transverse slide rail, the output end of the mobile motor is meshed with the rack through a gear, a guide plate is fixedly provided at the bottom of the motor seat, guide slopes are provided on both sides of the guide plate, and the guide A blocking slide is fixedly arranged on the rear side of the plate, and the two sides and the bottom of the blocking slide extend to the outside of the guide plate, and the front side of the blocking slide cooperates with the rear side of the blocking slide block, and the middle parts of the guide plate and the blocking slide are provided with corresponding grinding wheel grooves, and a grinding wheel is rotatably arranged inside the grinding wheel groove, and an edge grinding motor is fixedly arranged on the rear side of the blocking slide, and the edge grinding motor is transmission-connected with the edge grinding wheel, and glue heads are arranged on the outside of the guide plate and the blocking slide and on both sides of the edge grinding wheel, and a tension spring is arranged between the front side of the sliding plate and the front end of the fixed frame.

[0011] A preferred technical solution is that the conveyor belt bracket is fixedly provided with an exhaust hood below the connecting plate and the carrying belt, an exhaust groove is provided in the middle of the carrying belt, dust suction grooves are evenly provided on both sides of the lifting partition, the upper side and both sides of the dust suction grooves are open, and the length of the upper side of the exhaust hood is greater than the distance between the outer sides of adjacent connecting plates.

[0012] According to a preferred technical solution, the lower side of the connecting plate extends to below the carrying belt, the upper side of the exhaust hood is flush with the lower side of the connecting plate, and ventilation grooves are evenly arranged on the lower part of both sides of the through groove of the connecting plate.

[0013] According to a preferred technical solution, the four sides of the conveyor belt support are sealed.

[0014] According to a preferred technical solution, the connecting plate and the carrying belt have the same thickness and are flush with each other on the upper and lower sides, and the upper side of the exhaust hood is flush with the lower side of the connecting plate and the carrying belt.

[0015] A preferred technical solution is that a long groove is provided in the middle position of the lower side of the lifting partition, the lower side and both ends of the long groove are open, a fixed shaft is fixedly provided on the connecting plate and located in the middle position of the inner side of the through groove, the fixed shaft is slidably provided inside the long groove, and a compression spring is provided on the upper side of the fixed shaft and between the top of the long groove.

[0016] The preferred technical solution is that the left and right edge grinding mechanisms include two side edge grinding motors fixedly arranged on both sides of the conveyor belt bracket, the two side edge grinding motors are transmission-connected to the two side edge grinding wheels, and two side glue sponges are arranged on both sides of the conveyor belt bracket and behind the two side edge grinding wheels.

[0017] A preferred technical solution, the front and rear pressing mechanism includes two pairs of upper and lower sliding blocks arranged on both sides of the laminating mechanism for upward and downward sliding, a second compression spring is arranged on the upper side of the upper sliding block and the lower side of the lower sliding block, and a pressing rod is rotatably arranged between the sliding blocks corresponding to each other on both sides.

[0018] According to a preferred technical solution, the cutting mechanism comprises front and rear cutting blades driven to move up and down by a hydraulic cylinder and two side cutting blades located on both sides of the second conveyor belt mechanism.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The moisture-proof performance is significantly improved: by completely closing the lamination on the four sides of the cardboard body and setting sealant, the waterproof performance of the cardboard is greatly enhanced, especially the corners of the carton are not easily penetrated by water, thereby improving the overall waterproof performance of the kraft carton.

[0021] Optimization of mechanical structure of edge grinding and lamination:

[0022] The edge grinding mechanism grinds the edges of the cardboard front and back and left and right and applies glue, grinding the edges of the cardboard into rounded corners and roughening, which is conducive to the lamination of the edges of the cardboard. The lamination is not easy to break, the bonding is strong and the appearance is beautiful. The laminating mechanism fully laminates the cardboard to ensure that the sides of the cardboard are also laminated, which enhances the waterproof effect.

[0023] High degree of automation: Through the coordinated work of the conveyor belt mechanism, edge grinding mechanism, laminating mechanism, edge pressing mechanism and cutting mechanism, the automated production of cardboard moisture-proof treatment is realized, and the production efficiency is improved.

[0024] Stable positioning and conveying: The first conveyor belt mechanism realizes stable conveying and positioning of cardboard through the design of lifting partitions, blocking sliders and grooves, which is convenient for subsequent edging and laminating processing.

[0025] Dust collection and debris treatment: Through the design of the exhaust hood and dust collection slot, the debris generated by edge grinding can be effectively absorbed to avoid adverse effects on lamination and bonding, thereby improving product quality.

[0026] In summary, the moisture-proof kraft paperboard for packaging and the preparation device thereof of the present invention not only significantly improve the waterproof performance of the paperboard, but also realize automated production by optimizing the mechanical structures such as edge grinding, laminating, edge pressing and cutting, thereby improving production efficiency and product quality. At the same time, by adjusting the design of the exhaust hood, the dust collection and debris treatment effects are further optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the paperboard finished product of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the first conveyor belt mechanism and the front and rear edge grinding mechanisms of the present invention;

[0030] Figure 4 For the present invention Figure 3 Another structural schematic diagram of the orientation;

[0031] Figure 5 This is a schematic diagram of the structure of the exhaust hood of the present invention;

[0032] Figure 6 It is a cross-sectional structural diagram of the lifting partition, the connecting plate and the exhaust hood of the present invention;

[0033] Figure 7 It is a schematic diagram of the longitudinal section structure of the lifting partition plate, the connecting plate, the carrying belt and the exhaust hood of the present invention;

[0034] Figure 8 For the present invention Figure 3A schematic diagram of the enlarged structure of part A;

[0035] Fig. 9 For the present invention Figure 4 A schematic diagram of the enlarged structure of part B;

[0036] Fig.10 It is a schematic diagram of the structure of the travel track of the edging wheel of the present invention during edging;

[0037] Fig.11 It is a schematic diagram of the structure of the left and right edge grinding mechanism of the present invention;

[0038] Fig.12 It is a schematic diagram of the structure of the front and rear edge pressing mechanism of the present invention;

[0039] Fig.13 It is a schematic diagram of the cutting mechanism structure of the present invention;

[0040] Fig.14 It is a schematic diagram of the longitudinal section structure of the lifting partition plate, the connecting plate, the carrying belt and the exhaust hood in the second embodiment of the present invention;

[0041] In the figure: 1, cardboard body; 2, outer film coating; 3, material rack; 5, first conveyor belt mechanism; 6, front and rear edge grinding mechanism; 7, left and right edge grinding mechanism; 8, film coating mechanism; 9, front and rear edge pressing mechanism; 10, edge pressing wheels on both sides; 11, second conveyor belt mechanism; 12, cutting mechanism; 51, connecting plate; 52, carrying belt; 53, transmission motor; 54, conveyor belt bracket; 55, through groove; 56, lifting partition; 57, spring; 58, blocking slider; 59, groove; 510, exhaust hood; 511, exhaust slot; 512, dust suction slot; 513, ventilation slot; 514, long slot; 515, fixed shaft; 516, compression Spring; 61, fixed frame; 62, sliding plate; 63, T-slot horizontal slide rail; 64, T-slot slider; 65, motor seat; 66, moving motor; 67, rack; 68, gear; 69, guide plate; 610, guide slope; 611, blocking slide; 612, edge grinding wheel; 613, edge grinding motor; 614, glue head; 615, tension spring; 616, grinding wheel groove; 71, edge grinding motor on both sides; 72, edge grinding wheels on both sides; 73, glue sponge on both sides; 91, slider; 92, second compression spring; 93, edge pressing rod; 121, hydraulic cylinder; 122, front and rear cutting blades; 123, front and rear cutting blades. DETAILED DESCRIPTION

[0042] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0043] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0044] Embodiment 1

[0045] like Figure 2 As shown, a moisture-proof kraft liner board for packaging comprises a board body 1 and an outer coating 2, wherein the outer coating 2 is completely closed on four sides of the board body 1 and a sealant 3 is provided between the inner side of the edge of the outer coating 2 and the four sides of the board body 1. The moisture-proof kraft liner board for packaging of the present invention is not only coated on the upper and lower sides, but also coated and sealed on the four sides of the board, which greatly improves the waterproof performance of the board, especially after being made into a carton, the corners of the carton formed by the sides of the carton are not easily penetrated by water, thereby greatly improving the waterproof performance of the kraft carton.

[0046] like Figure 1 As shown, a device for preparing moisture-proof kraft liner paper for packaging includes a first conveyor belt mechanism 5, front and rear edge grinding mechanisms 6, left and right edge grinding mechanisms 7, a laminating mechanism 8, front and rear edge pressing mechanisms 9, edge pressing wheels 10 on both sides, a second conveyor belt mechanism 11 and a cutting mechanism 12. The front and rear edge grinding mechanisms 6 are arranged on the upper part of the first conveyor belt mechanism 5, the left and right edge grinding mechanisms 7 are arranged on both sides of the first conveyor belt mechanism 5, the laminating mechanism 8 is arranged at the end of the first conveyor belt mechanism, the front and rear edge pressing mechanisms 9 are arranged on the laminating mechanism 8, the second conveyor belt mechanism 11 is arranged on the rear side of the laminating mechanism 8, the edge pressing wheels 10 on both sides are arranged on both sides of the second conveyor belt mechanism 11, and the cutting mechanism 12 is arranged on the second conveyor belt mechanism 11 and is located on the rear side of the edge pressing wheels on both sides.

[0047] like Figure 1As shown, the specific working process of the present invention is that the cardboard to be processed is conveyed by the first conveyor belt mechanism 5, and the front and rear edge grinding mechanism 6 and the left and right edge grinding mechanism 7 on the upper side of the first conveyor belt mechanism 5 respectively grind the front and rear and left and right sides of the cardboard to be processed and glue them, and then the laminating mechanism 8 is used to laminate the entire surface of the cardboard. During lamination, the size of the film is larger than the size of the cardboard to ensure that the side of the cardboard is also laminated, and then the front and rear edge pressing mechanisms 9 and the edge pressing wheels 10 on both sides are used to press the laminated cardboard to ensure that the film on the edge of the cardboard is tightly bonded up and down, and finally the excess film on the edge is cut by the cutting mechanism 12 and then sent out by the second conveyor belt mechanism 11. The purpose of grinding the edges of the cardboard in the present invention is to grind the edges of the cardboard into rounded corners and to roughen them. Since the previously processed cardboard is cut by the edges, the edges of the cardboard to be processed are right-angled and sharp, and some corrugated paper edges have many holes, which is not conducive to the lamination of the cardboard edges and the bonding of the films. Direct lamination will cause the lamination to be easily punctured at right angles, and the bonding between the film and the edge of the cardboard is not strong. Therefore, grinding the edges of the cardboard into rounded corners and roughening them is conducive to the lamination of the edges of the cardboard. The lamination is not easy to break, the bonding is strong, and the appearance after lamination is more beautiful.

[0048] like Figure 3-Figure 10 As shown,

[0049] The first conveyor belt mechanism 5 includes a plurality of connecting plates 51, and a carrying belt 52 is fixedly arranged between adjacent connecting plates 51. The connecting plates 51 and the carrying belt 52 are connected end to end to form a conveyor belt and are driven by a transmission motor 53 and arranged on a conveyor belt bracket 54. A through slot 55 penetrating through both ends of the connecting plate 51 is arranged on the connecting plate 51, and a lifting partition 56 is slidably arranged on the inner side of the through slot 55. Both ends of the lifting partition 56 extend to both sides of the carrying belt 52. The lengths of the two ends of the lifting partition 56 extending to both sides of the carrying belt 52 are different and the adjacent lifting partitions 56 are arranged alternately. Springs 57 are arranged between the lower parts of the two ends of the lifting partition 56 and the inner sides of the two ends of the through slot 55. A blocking slider 58 is arranged on the upper side of the lifting partition 56, and grooves 59 are symmetrically arranged on both sides of the conveyor belt bracket 54. The first conveyor belt mechanism 5 is the main conveying tool for processing cardboard, and the entire edge grinding action is completed on the first conveyor belt mechanism 5. Therefore, while conveying, the cardboard can also be positioned and fixed to facilitate the edge grinding of the cardboard. Specifically, the two sides of the cardboard can be positioned by the upper two sides of the conveyor belt bracket 54, and the front and back of the cardboard are respectively attached between the adjacent lifting partitions 56. In this way, the cardboard will not shake when conveying. The lifting partition 56 of the present invention can be raised and lowered. When edging the front and back sides of the cardboard, it is only necessary to press the lifting partition 56 on the side, and the lifting partition 56 is retracted into the inside of the through groove 55. Then, the side of the cardboard can be edged, and the lowering partition 56 on the opposite side is lowered to play a positioning role.

[0050] The front and rear edge grinding mechanism 6 includes a fixed frame 61 mounted on the upper part of both sides of the conveyor belt bracket 54, a sliding plate 62 is slidably provided on the upper part of the fixed frame 61, a T-slot transverse slide rail 63 is fixedly provided at the bottom of the slide plate 62, a motor seat 65 is slidably provided at the lower part of the T-slot transverse slide rail 63 through a T-slot slider 64, a mobile motor 66 is fixedly provided on the motor seat 65, a rack 67 is fixedly provided on the side of the T-slot transverse slide rail 63, and the output end of the mobile motor 66 is meshed with the rack 67 through a gear 68, a guide plate 69 is fixedly provided at the bottom of the motor seat 65, a guide inclined surface 610 is provided on both sides of the guide plate 69, and a blocking plate is fixedly provided on the rear side of the guide plate 69 The blocking slide plate 611, the two sides and the bottom of the blocking slide plate 611 extend to the outside of the guide plate 69, the front side of the blocking slide plate 611 cooperates with the rear side of the blocking slide block 58, the middle parts of the guide plate 69 and the blocking slide plate 611 are provided with corresponding grinding wheel grooves 616, the inner part of the grinding wheel groove 616 is provided with an edging wheel 612 for rotation, the rear side of the blocking slide plate 611 is fixedly provided with an edging motor 613, the edging motor 613 is connected with the edging wheel 612 in transmission, the outer sides of the guide plate 69 and the blocking slide plate 611 and located on both sides of the edging wheel 612 are provided with a glue head 614, and a tension spring 615 is provided between the front side of the sliding plate 62 and the front end of the fixed frame 61. The present invention can complete the edging of the front and rear sides of the cardboard during the conveying process without stopping the first conveyor belt mechanism 5. Specifically, when the lifting partition 56 moves backward with the first conveyor belt mechanism 5, the blocking slide 58 is located at the upper front end of the groove 59, and the lifting partition 56 extends to the upper part of the longer end of the outer side of the carrier belt 52. The blocking slide 58 will be blocked by the blocking slide 611, and the blocking slide 58 will drive the blocking slide 611 together with the front and rear edging mechanisms 6 (except the fixing frame 61) to move backward, and then start the moving motor 66, and under the action of the gear 68 and the rack 67, drive the motor seat 65 together with the guide plate 69, the blocking slide 611, the edging wheel 612, the edging motor 613 and the glue head 614 to extend to the lifting partition 56 to move to the shorter end of the outer side of the carrier belt 52 (such as Fig.10When the edging wheel 612 is moving, the guide slope 610 on one side of the guide plate 69 will squeeze the upper side of the blocking slider 58, so that the blocking slider 58 and the lifting partition 56 can be pressed down, so that the lifting partition 56 is retracted into the inside of the through groove 55. When the edging wheel 612 moves, the edging motor 613 is turned on to rotate. The edging wheel 612 corresponds to the front and rear side positions of the cardboard, and then the edging wheel 612 can grind the rear side of the previous cardboard and the front side of the next cardboard at the same time. When the edging wheel 612 is grinding, the gluing head 614 located on the rear side of the movement direction of the edging wheel 612 is opened for gluing, and the gluing head 614 located on the front side of the movement direction of the edging wheel 612 is closed. During gluing, when the moving motor 66 drives the lifting baffle 56 to extend to the shorter end outside the carrying belt 52, the blocking slider 58 will be separated from the blocking slider 611. Under the action of the tension spring 615, the sliding plate 62 will return to the revealed position, and the blocking slider 611 will be switched to the other side of the cardboard and located at the front end above the groove 59 on the other side. Since the two ends of the lifting baffle 56 extend to the two sides of the carrying belt 52 at different lengths and the adjacent lifting baffles 56 are arranged alternately, the blocking slider 611 will encounter the next blocking slider 58, and then the moving motor 66 will flip, and repeat the above actions, so that the grinding wheel 612 can grind the front and back sides of the cardboard without stopping the first conveyor belt mechanism 5.

[0051] The conveyor belt support 54 is fixedly provided with an exhaust hood 510 below the connecting plate 51 and the carrying belt 52, an exhaust slot 511 is provided in the middle of the carrying belt 52, and dust suction slots 512 are evenly provided on both sides of the lifting partition 56. The upper side and both sides of the dust suction slots 512 are open, and the length of the upper side of the exhaust hood 510 is greater than the distance between the outer sides of adjacent connecting plates 51. In order to increase the stability during edge grinding and cardboard conveying, during edge grinding, the exhaust hood 510 exhausts air through the exhaust slots 511 to achieve negative pressure inside the exhaust hood 510, and the cardboard is adsorbed on the carrying belt 52, thereby increasing the stability of the cardboard. During edge grinding, the lifting partition 56 descends, and the dust suction slots 512 are connected to the inside of the exhaust hood 510, so as to absorb the debris generated by the edge grinding of the cardboard, thereby avoiding the adverse effects of the debris on the lamination and bonding.

[0052] The lower side of the connecting plate 51 extends to the bottom of the carrying belt 52, the upper side of the exhaust hood 510 is flush with the lower side of the connecting plate 51, and ventilation slots 513 are evenly arranged at the lower part of both sides of the through slot 55 of the connecting plate 51. The four sides of the conveyor belt bracket 54 are sealed. The exhaust hood 510 has the effect of exhausting air inside the conveyor belt bracket 54, so that a certain negative pressure can be created inside the entire conveyor belt bracket 54, which can have a certain adsorption effect on all the cardboards on the carrying belt 52, and play a role in stabilizing the conveying of cardboards. The exhaust fan connected to the outside of the exhaust hood 510 is required to have a large power to meet the large-area adsorption effect.

[0053] A long slot 514 is provided at the middle position of the lower side of the lifting partition 56, and the lower side and both ends of the long slot 514 are open. A fixed shaft 515 is fixedly provided on the connecting plate 51 and located at the inner middle position of the through slot 55. The fixed shaft 515 is slidably provided inside the long slot 514, and a compression spring 516 is provided between the upper side of the fixed shaft 515 and the top of the long slot 514. When edge grinding is performed, when one end of the lifting partition 56 is pressed down, due to the uniform receiving part, the lifting partition 56 will rotate to a certain extent, the pressed end will be retracted into the through slot 55, and the other end will be tilted, and the tilted end can continue to play the role of positioning the cardboard, so that the stability of the cardboard can be better maintained, and the dust suction groove 512 of the lifting partition 56 at the pressed part will communicate with the inside of the exhaust hood 510, while the dust suction groove 512 of the lifting partition 56 at the tilted part will not communicate with the inside of the exhaust hood 510, so that it can play a better wind gathering role, thereby achieving a better dust suction effect. In addition, when the middle of the lifting partition 56 is pressed down, the entire lifting partition 56 will retract into the through slot 55, and at this time, the two sides of the edge grinding wheel 612 just correspond to the middle position of the side of the front and rear paperboards, which can also play a positioning role.

[0054] like Fig.11 As shown, the left and right edge grinding mechanism 7 includes two side edge grinding motors 71 fixedly arranged on both sides of the conveyor belt bracket 54, and the two side edge grinding motors 71 are drivingly connected to the two side edge grinding wheels 72, and two side gluing sponges 73 are arranged on both sides of the conveyor belt bracket 54 and behind the two side edge grinding wheels 72. The two side edge grinding motors 71 drive the two side edge grinding wheels 72 to grind the two sides of the cardboard, and the two side gluing sponges 73 glue the two sides of the cardboard.

[0055] like Fig.12As shown, the front and rear edge pressing mechanism 9 includes two pairs of upper and lower sliders 91 slidably arranged on both sides of the film laminating mechanism 8, and the upper side of the slider 91 located at the upper side and the lower side of the slider 91 located at the lower side are both provided with a second compression spring 92, and an edge pressing rod 93 is rotatably arranged between the sliders 91 corresponding to each other on both sides. The diameter of the edge pressing rod 93 is set relatively small, and the edge pressing rod 93 of a suitable diameter is selected according to the thickness of the paperboard. The edge pressing rod 93 passes through the front and rear sides of the paperboard under the action of the compression spring 92, and the laminating films on the front and rear sides of the paperboard are pressed and bonded together.

[0056] like Fig.13 As shown, the cutting mechanism 12 includes front and rear cutting blades 122 driven to move up and down by a hydraulic cylinder 121 and side cutting blades 123 located on both sides of the second conveyor belt mechanism 11. The front and rear cutting blades 122 move up and down to cut the front and rear side films of the cardboard, and the side cutting blades 123 cut the left and right side films of the cardboard.

[0057] The coating mechanism 8, front and rear edge pressing mechanisms 9, edge pressing wheels 10 on both sides, second conveyor belt mechanism 11 and cutting mechanism 12 of the present invention can all be realized by using structures in the prior art, and their specific structures will not be described in detail here.

[0058] Embodiment 2

[0059] like Fig.14 As shown, the content of the first embodiment "the lower side of the connecting plate 51 extends to the bottom of the carrying belt 52, the upper side of the exhaust hood 510 is flush with the lower side of the connecting plate 51, and ventilation grooves 513 are evenly arranged on the lower parts of both sides of the through slot 55 of the connecting plate 51. The four sides of the conveyor belt bracket 54 are sealed." is modified to the connecting plate 51 and the carrying belt 52 have the same thickness and are flush with the upper and lower surfaces, and the upper side of the exhaust hood 510 is flush with the lower sides of the connecting plate 51 and the carrying belt 52. The other structures are consistent with those of the first embodiment. The exhaust hood 510 only adsorbs the cardboard on the corresponding upper side of the carrying belt 52, and only vacuums the dust suction groove 512 of the lifting partition 56 that is on the upper side of the exhaust hood 510 and presses down. In this way, the power of the exhaust fan connected to the outside of the exhaust hood 542 is smaller, and the adsorption and dust suction effects are better. In this embodiment, the process of grinding the front and rear sides of the cardboard by the front and rear edge grinding mechanism 6 needs to be completed above the exhaust hood, because the lifting partition 56 will protrude below the connecting plate 51 and the carrying belt 52 when pressed down. If it does not rebound to the starting position after the processing is completed, it will interfere with the upper side of the exhaust hood 510.

[0060] The preferred implementation modes of the present application are described in detail above, but the present application is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present application.

Claims

1. A moisture-proof kraft linerboard for packaging, characterized in that: It comprises a cardboard body (1) and an outer coating (2), wherein the outer coating (2) is completely closed on four sides of the cardboard body (1) and a sealant (3) is provided between the inner side of the edge of the outer coating (2) and the four sides of the cardboard body (2).

2. A device for preparing moisture-proof kraft paper for packaging according to claim 1, characterized in that: The invention comprises a first conveyor belt mechanism (5), a front and rear edge grinding mechanism (6), a left and right edge grinding mechanism (7), a laminating mechanism (8), a front and rear edge pressing mechanism (9), edge pressing wheels on both sides (10), a second conveyor belt mechanism (11) and a cutting mechanism (12), wherein the front and rear edge grinding mechanism (6) is arranged on the upper part of the first conveyor belt mechanism (5), the left and right edge grinding mechanism (7) is arranged on both sides of the first conveyor belt mechanism (5), the laminating mechanism (8) is arranged at the end of the first conveyor belt mechanism, the front and rear edge pressing mechanism (9) is arranged on the laminating mechanism (8), the second conveyor belt mechanism (11) is arranged on the rear side of the laminating mechanism (8), the edge pressing wheels on both sides (10) are arranged on both sides of the second conveyor belt mechanism (11), and the cutting mechanism (12) is arranged on the second conveyor belt mechanism (11) and is located on the rear side of the edge pressing wheels on both sides; The first conveyor belt mechanism (5) comprises a plurality of connecting plates (51), a carrying belt (52) is fixedly arranged between adjacent connecting plates (51), the connecting plates (51) and the carrying belt (52) are connected end to end to form a conveyor belt and are driven by a transmission motor (53) and arranged on a conveyor belt bracket (54), the connecting plates (51) are provided with through grooves (55) penetrating through both ends of the connecting plates (51), a lifting partition (56) is slidably arranged on the inner side of the through groove (55), both ends of the lifting partition (56) extend to both sides of the carrying belt (52), the lengths of the two ends of the lifting partition (56) extending to both sides of the carrying belt (52) are different and adjacent lifting partitions (56) are arranged alternately, springs (57) are arranged between the lower parts of the two ends of the lifting partition (56) and the inner sides of the two ends of the through groove (55), a blocking slider (58) is arranged on the upper side of the lifting partition (56), and grooves (59) are symmetrically arranged on both sides of the conveyor belt bracket (54); The front and rear edge grinding mechanism (6) comprises a fixed frame (61) mounted on the upper part of both sides of the conveyor belt bracket (54), a sliding plate (62) is slidably provided on the upper part of the fixed frame (61), a T-slot transverse slide rail (63) is fixedly provided at the bottom of the slide plate (62), a motor seat (65) is slidably provided at the lower part of the T-slot transverse slide rail (63) through a T-slot slider (64), a mobile motor (66) is fixedly provided on the motor seat (65), a rack (67) is fixedly provided on the side of the T-slot transverse slide rail (63), the output end of the mobile motor (66) is meshed with the rack (67) through a gear (68), a guide plate (69) is fixedly provided on the bottom of the motor seat (65), guide inclined surfaces (610) are provided on both sides of the guide plate (69), and the rear side of the guide plate (69) is fixedly provided. A blocking slide plate (611) is provided, and the two sides and the bottom of the blocking slide plate (611) extend to the outside of the guide plate (69), and the front side of the blocking slide plate (611) cooperates with the rear side of the blocking slide block (58). The middle parts of the guide plate (69) and the blocking slide plate (611) are provided with grinding wheel grooves (616) corresponding to each other, and a grinding wheel (612) is rotatably provided inside the grinding wheel groove (616). An edge grinding motor (613) is fixedly provided on the rear side of the blocking slide plate (611), and the edge grinding motor (613) is transmission-connected to the edge grinding wheel (612). Gluing heads (614) are provided on the outside of the guide plate (69) and the blocking slide plate (611) and on both sides of the edge grinding wheel (612), and a tension spring (615) is provided between the front side of the sliding plate (62) and the front end of the fixing frame (61).

3. The device for preparing moisture-proof kraft linerboard for packaging according to claim 2, characterized in that: The conveyor belt bracket (54) is fixedly provided with an exhaust hood (510) below the connecting plate (51) and the carrying belt (52); an exhaust groove (511) is provided in the middle of the carrying belt (52); dust suction grooves (512) are evenly provided on both sides of the lifting partition (56); the upper side and both sides of the dust suction groove (512) are open; the length of the upper side of the exhaust hood (510) is greater than the distance between the outer sides of adjacent connecting plates (51).

4. The device for preparing moisture-proof kraft linerboard for packaging according to claim 1, characterized in that: The lower side of the connecting plate (51) extends to below the carrying belt (52), the upper side of the exhaust hood (510) is flush with the lower side of the connecting plate (51), and ventilation grooves (513) are evenly arranged on the lower part of both sides of the through groove (55) of the connecting plate (51).

5. The device for preparing moisture-proof kraft liner paperboard for packaging according to claim 4, characterized in that: The four sides of the conveyor belt support (54) are sealed.

6. The device for preparing moisture-proof kraft linerboard for packaging according to claim 3, characterized in that: The connecting plate (51) and the carrying belt (52) have the same thickness and are flush with each other on top and bottom. The upper side of the exhaust hood (510) is flush with the lower side of the connecting plate (51) and the carrying belt (52).

7. A device for preparing moisture-proof kraft linerboard for packaging according to claim 4, 5 or 6, characterized in that: A long slot (514) is provided at the middle position of the lower side of the lifting partition (56), and the lower side and both ends of the long slot (514) are open. A fixed shaft (515) is fixedly provided on the connecting plate (51) and located at the middle position of the inner side of the through slot (55). The fixed shaft (515) is slidably provided inside the long slot (514), and a compression spring (516) is provided on the upper side of the fixed shaft (515) and between the top of the long slot (514).

8. The device for preparing moisture-proof kraft linerboard for packaging according to claim 1, characterized in that: The left and right edge grinding mechanism (7) comprises two side edge grinding motors (71) fixedly arranged on two sides of the conveyor belt bracket (54), the two side edge grinding motors (71) are drivingly connected to two side edge grinding wheels (72), and two side glue sponges (73) are arranged on both sides of the conveyor belt bracket (54) and behind the two side edge grinding wheels (72).

9. The device for preparing moisture-proof kraft linerboard for packaging according to claim 1, characterized in that: The front and rear edge pressing mechanisms (9) include two pairs of upper and lower sliders (91) that slide up and down on both sides of the coating mechanism (8), and a second compression spring (92) is provided on the upper side of the upper slider (91) and the lower side of the lower slider (91), and an edge pressing rod (93) is rotatably provided between the sliders (91) corresponding to each other on both sides.

10. The device for preparing moisture-proof kraft liner paperboard for packaging according to claim 1, characterized in that: The cutting mechanism (12) comprises front and rear cutting blades (122) driven to move up and down by a hydraulic cylinder (121) and two side cutting blades (123) located on both sides of the second conveyor belt mechanism (11).

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