Production process of all-bamboo ecological board

Abstract

The present invention discloses a production process for an all-bamboo ecological board, comprising the following steps: (1) sawing bamboo; (2) breaking bamboo; (3) forming bamboo slices of fixed thickness; (4) fine planing; (5) pressing bamboo layers; (6) rotary cutting; (7) pressing heavy bamboo layers; (8) sanding; (9) laminating; (10) laminating film: feeding a slab into a laminating machine and laminating the film to the outer surface of the heavy bamboo layer; (11) edge sawing: edge sawing the ecological board according to relevant dimensions; (12) inspection: selecting, inspecting, and packaging the ecological board. Compared with the prior art, the present invention does not require de-greening or de-yellowing when pressing the bamboo layer, thereby simplifying the process, reducing costs, and increasing efficiency. Furthermore, not removing the greening can improve the compressive strength of the ecological board. Furthermore, the present invention adopts rotary cutting technology to press the heavy bamboo layer, so that the thickness of the heavy bamboo layer can be reduced to 1-1.5 mm, and bamboo knots can be removed, thereby solving the problem of uneven density.

Description

Technical Field

[0001] The invention relates to the technical field of ecological board production, and in particular to a production process of an all-bamboo ecological board. Background Art

[0002] Eco-board is primarily made of a bamboo layer, two layers of dense bamboo on either side of the bamboo layer, and a film laminated to the outer surface of the dense bamboo layer, all glued together and extruded. Currently, commercially available eco-boards are made from bamboo, eucalyptus, or other woods. Eco-board is the most common decorative board material in the home improvement market. It primarily uses an impregnated film laminate as a decorative layer, affixed to the dense bamboo layer, to create a solid wood feel and decorative effect.

[0003] When conventional eco-boards are made from ordinary bamboo, they need to be de-greened and de-yellowed, which not only complicates the production process and increases costs, but also affects the compressive strength of the eco-boards. Furthermore, the quality of the adhesive bonding on existing eco-boards is poor, making them prone to peeling and bulging.

[0004] In view of this, the applicant conducted in-depth research on the above issues, which led to the present case. Summary of the Invention

[0005] The main purpose of the present invention is to provide a production process for an all-bamboo ecological board, which can effectively solve the above technical problems.

[0006] In order to achieve the above object, the solution of the present invention is:

[0007] A production process of an all-bamboo ecological board comprises the following steps:

[0008] (1) Sawing bamboo: sawing the bamboo from the root and removing the bamboo leaves on the bamboo stem to obtain the raw material;

[0009] (2) Splitting bamboo: using a cutting machine to split the bamboo pole in half;

[0010] (3) Thickening bamboo strips: Use a planing and milling machine to plan and mill the bamboo strips to the specified thickness;

[0011] (4) Fine planing: Carbonize and dry the bamboo slices of a certain thickness, and then use a planing and milling machine to fine plan the bamboo slices;

[0012] (5) Pressing the bamboo layer: rolling the bamboo slices with glue, laying the bamboo slices on a hot press, and then hot pressing them with a hot press to obtain a bamboo layer;

[0013] (6) Peeling: The bamboo material is pressed into a cylindrical shape, and then the cylindrical bamboo material is peeled by a peeling machine to obtain thin bamboo slices;

[0014] (7) Pressing the heavy bamboo layer: Roll the thin bamboo slices with glue, and then spread the thin bamboo slices on a hot press to press them into a heavy bamboo layer of 1-1.5 mm;

[0015] (8) Sanding: polish and smooth the surface of the heavy bamboo layer to ensure the flatness of the surface of the heavy bamboo layer;

[0016] (9) Lamination: Apply glue on the upper surface of the bamboo layer, then cover the heavy bamboo layer on the bamboo layer and send it into a laminating machine for lamination to obtain a slab;

[0017] (10) Laminating paper: feeding the slab into the laminating machine, laminating the laminating paper on the outer surface of the heavy bamboo layer;

[0018] (11) Edge sawing: Edge sawing of the substrate according to relevant dimensions;

[0019] (12) Inspection: Select, inspect and pack the eco-boards.

[0020] Furthermore, the sticker machine includes a frame, a conveyor belt, a laminating roller, a glue spraying mechanism and a transmission mechanism. The conveyor belt and the transmission mechanism are installed on the frame. The laminating roller is symmetrically arranged up and down. The two ends of the laminating roller are connected to the transmission mechanism, and the transmission mechanism is connected to the glue spraying mechanism. The transmission mechanism drives the laminating roller to rotate and drives the glue spraying mechanism to spray glue.

[0021] Furthermore, the transmission mechanism includes a driving motor and a first gear, the first gear is provided at both ends of the rotating shaft of the pressing roller, and the driving motor is connected to the rotating shaft of the pressing roller through a pulley mechanism.

[0022] Furthermore, the glue spraying mechanism includes a glue storage box, a glue delivery barrel, a first closing plate, a second closing plate, a first driving rod, a second driving rod, a mounting frame, a glue spraying hose and a nozzle. The glue storage box and the mounting frame are installed on the frame, the glue delivery barrel is symmetrically arranged on both sides of the frame, the first closing plate and the second closing plate are arranged in the glue delivery barrel, and the first closing plate and the second closing plate divide the interior of the glue delivery barrel into a first cavity, a second cavity and a third cavity. The end of the first driving rod is connected to the first closing plate, and the end of the second driving rod is connected to the second closing plate. The first driving rod slides through the interior of the second driving rod. The first cavity, the second cavity and the third cavity are connected to the glue storage box through a feed pipe, and the first cavity, the second cavity and the third cavity are connected to the glue spraying hose through a discharge pipe. The glue spraying hose is connected to the mounting frame, and the nozzles are arranged and distributed at the lower end of the glue spraying hose.

[0023] Furthermore, the transmission mechanism also includes a first connecting seat, a second connecting seat, a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. The pressing roller includes an upper pressing roller and a lower pressing roller. The first connecting seat is connected to the end of the first driving rod, and the second connecting seat is connected to the end of the second driving rod. One end of the first connecting rod is fixedly connected to the rotating shaft of the upper pressing roller and the other end of the first connecting rod is rotatably connected to the end of the second connecting rod. The other end of the second connecting rod is rotatably connected to the first connecting seat, one end of the third connecting rod is fixedly connected to the rotating shaft of the lower pressing roller and the other end of the third connecting rod is rotatably connected to the end of the fourth connecting rod, and the other end of the fourth connecting rod is rotatably connected to the second connecting seat.

[0024] Furthermore, a first connecting shaft is provided between the first connecting seats on both sides, and the end of the second connecting rod is sleeved on the first connecting shaft. A second connecting shaft is provided between the second connecting seats on both sides, and the end of the fourth connecting rod is sleeved on the second connecting shaft.

[0025] Furthermore, first guide plates are provided on both sides of the frame, and a plurality of transversely arranged first guide grooves are provided on the first guide plates. Guide shafts are provided on the first connecting seat and the second connecting seat, and the guide shafts and the first guide grooves are slidably connected to each other.

[0026] Furthermore, it also includes a hot pressing roller, a rack, a second gear and a fifth connecting rod. The second gear is arranged at both ends of the rotating shaft of the hot pressing roller, the rack is arranged on the frame, the second gear is engaged with the rack for transmission, a second guide plate is provided on the frame, a second guide groove is provided on the second guide plate, the rotating shaft end of the hot pressing roller is slidably connected to the second guide groove, one end of the fifth connecting rod is connected to the rotating shaft of the hot pressing roller and the other end of the fifth connecting rod is rotatably connected to the first connecting seat.

[0027] Compared with existing technologies, this invention offers the following advantages: it eliminates the need for green or yellowing removal when pressing the bamboo layer, simplifying the process, reducing costs, and increasing efficiency. Furthermore, eliminating greening also improves the compressive strength of the eco-board. Furthermore, the present invention utilizes rotary cutting technology to press the heavy bamboo layer, achieving a thickness of 1-1.5 mm and removing bamboo knots, addressing the issue of uneven density. Furthermore, the present invention's laminating machine ensures smoother lamination of the film and paper, improving the quality of the eco-board. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of the appearance structure of the sticker machine.

[0029] Figure 2 This is another three-dimensional schematic diagram of the external structure of the sticker machine.

[0030] Figure 3 It is a cross-sectional diagram of a sticker machine.

[0031] Figure 4 This is a schematic diagram of the cross-sectional structure of the glue delivery barrel.

[0032] Figure 5 Schematic diagram of the structure of the glue spray hose.

[0033] Figure 6 This is another cross-sectional structural diagram of the sticker machine.

[0034] In the figure: frame 1, conveyor roller 11, first guide plate 12, first guide groove 13, guide shaft 14, second guide plate 15, second guide groove 16, conveyor belt 2, glue spraying mechanism 3, glue storage box 31, feed pipe 311, discharge pipe 312, glue delivery barrel 32, first cavity 321, second cavity 322, third cavity 323, first closing plate 33, second closing plate 34, first driving rod 35, second driving rod 36, mounting bracket 37, glue spraying hose 38, nozzle 39, transmission mechanism 4, drive motor 41, first gear 42, first connecting seat 43, second connecting seat 44, first connecting rod 45, second connecting rod 46, third connecting rod 47, fourth connecting rod 48, hot pressing roller 51, rack 52, second gear 53, fifth connecting rod 54, upper pressing roller 61, lower pressing roller 62, first connecting shaft 63, second connecting shaft 64. DETAILED DESCRIPTION

[0035] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0036] like Figure 1-6 As shown, a production process of a full bamboo ecological board includes the following steps:

[0037] (1) Sawing bamboo: sawing the bamboo from the root and removing the bamboo leaves on the bamboo stem to obtain the raw material;

[0038] (2) Splitting bamboo: using a cutting machine to split the bamboo pole in half;

[0039] (3) Thickening bamboo strips: Use a planing and milling machine to plan and mill the bamboo strips to the specified thickness;

[0040] (4) Fine planing: Carbonize and dry the bamboo slices of a certain thickness, and then use a planing and milling machine to fine plan the bamboo slices;

[0041] (5) Pressing the bamboo layer: rolling the bamboo slices with glue, laying the bamboo slices on a hot press, and then hot pressing them with a hot press to obtain a bamboo layer;

[0042] (6) Peeling: The bamboo material is pressed into a cylindrical shape, and then the cylindrical bamboo material is peeled by a peeling machine to obtain thin bamboo slices;

[0043] (7) Pressing the heavy bamboo layer: Roll the thin bamboo slices with glue, and then spread the thin bamboo slices on a hot press to press them into a heavy bamboo layer of 1-1.5 mm;

[0044] (8) Sanding: polish and smooth the surface of the heavy bamboo layer to ensure the flatness of the surface of the heavy bamboo layer;

[0045] (9) Lamination: Apply glue on the upper surface of the bamboo layer, then cover the heavy bamboo layer on the bamboo layer and send it into a laminating machine for lamination to obtain a slab;

[0046] (10) Film paper: feed the slab into the sticker machine and stick the film paper on the outer surface of the heavy bamboo layer. Melamine paper can be used as the film paper;

[0047] (11) Edge sawing: Edge sawing of the eco-board according to relevant dimensions;

[0048] (12) Inspection: Select, inspect and pack the eco-boards.

[0049] Compared with existing technologies, the present invention offers the following advantages: it eliminates the need for green or yellowing removal when pressing the bamboo layer, simplifying the process, reducing costs, and increasing efficiency. Furthermore, eliminating greening also improves the compressive strength of the eco-board. Furthermore, the present invention utilizes rotary cutting technology to press the heavy bamboo layer, achieving a thickness of 1-1.5 mm and removing bamboo knots, thereby addressing the issue of uneven density.

[0050] In this application, in order to improve the sticker quality of the ecological board, the sticker machine includes a frame 1, a conveyor belt 2, a pressing roller, a glue spraying mechanism 3 and a transmission mechanism 4. The conveyor belt 2 and the transmission mechanism 4 are installed on the frame 1. The frame 1 is also provided with a conveyor roller 11, which can convey the film paper. The conveyor belt 2 can convey the slab. The pressing roller is symmetrically arranged up and down. The pressing roller presses the slab and the film paper together. The two ends of the pressing roller are connected to the transmission mechanism 4, and the transmission mechanism 4 is connected to the glue spraying mechanism 3. The transmission mechanism 4 drives the pressing roller to rotate and drives the glue spraying mechanism 3 to spray glue.

[0051] Preferably, the transmission mechanism 4 includes a drive motor 41 and a first gear 42. The first gear 42 is provided at both ends of the rotating shaft of the laminating roller. The drive motor 41 is connected to the rotating shaft of the upper or lower laminating roller via a pulley mechanism. In this embodiment, the laminating roller includes an upper laminating roller 61 and a lower laminating roller 62. The drive motor 41 is connected to the lower laminating roller 62. The drive motor 41 drives the lower laminating roller 62 to rotate. The lower laminating roller 62 drives the upper laminating roller 61 to rotate relative to the lower laminating roller 62 via the first gear 42. The upper laminating roller 61 and the lower laminating roller 62 rotate in opposite directions.

[0052] In this embodiment, the glue spraying mechanism 3 includes a glue storage box 31, a glue delivery barrel 32, a first closing plate 33, a second closing plate 34, a first driving rod 35, a second driving rod 36, a mounting frame 37, a glue spraying hose 38 and a nozzle 39. The glue storage box 31 and the mounting frame 37 are installed on the frame 1. The glue storage box 31 is used to store glue. The mounting frame 37 is arranged above the conveyor belt 2 for fixing the glue spraying hose 38. The glue delivery barrel 32 is symmetrically arranged on both sides of the frame 1. The first closing plate 33 and the second closing plate 34 are arranged in the glue delivery barrel 32. The first closing plate 33 is arranged on the rear side of the second closing plate 34. The outer side surfaces of the first closing plate 33 and the second closing plate 34 are sealed to the inner wall of the glue delivery barrel 32 by sealing members. The first and second sealing plates 33 and 34 divide the interior of the glue delivery barrel 32 into a first cavity 321, a second cavity 322, and a third cavity 323. The end of the first drive rod 35 is connected to the first sealing plate 33, and the end of the second drive rod 36 is connected to the second sealing plate 34. The first drive rod 35 slides through the interior of the second drive rod 36. The first, second, and third cavities 321, 322, and 323 are connected to the glue storage box 31 via a feed pipe 311. The first, second, and third cavities 321, 322, and 323 are connected to the glue spraying hose 38 via a discharge pipe 312. The glue spraying hose 38 is connected to the mounting bracket 37, and nozzles 39 are arranged and distributed at the lower end of the glue spraying hose 38. The feed pipe 311 and discharge pipe 312 are equipped with one-way valves, ensuring that glue can only enter the glue delivery barrel 32 from the glue storage box 31 and then enter the glue spraying hose 38 from the glue delivery barrel 32. The transmission mechanism 4 also includes a first connecting seat 43, a second connecting seat 44, a first connecting rod 45, a second connecting rod 46, a third connecting rod 47 and a fourth connecting rod 48. The pressing roller includes an upper pressing roller 61 and a lower pressing roller 62. The first connecting seat 43 is connected to the end of the first driving rod 35, and the second connecting seat 44 is connected to the end of the second driving rod 36. One end of the first connecting rod 45 is fixedly connected to the rotating shaft of the upper pressing roller 61 and the other end of the first connecting rod 45 is rotatably connected to the end of the second connecting rod 46. The other end of the second connecting rod 46 is rotatably connected to the first connecting seat 43, one end of the third connecting rod 47 is fixedly connected to the rotating shaft of the lower pressing roller 62 and the other end of the third connecting rod 47 is rotatably connected to the end of the fourth connecting rod 48, and the other end of the fourth connecting rod 48 is rotatably connected to the second connecting seat 44. With the above structure, when the drive motor 41 drives the lower pressing roller 62 to rotate, it causes the third connecting rod 47 and the fourth connecting rod 48 to swing, driving the second driving rod 36 to move repeatedly in the horizontal direction, thereby driving the second closing plate 34 to move repeatedly in the glue delivery barrel 32. The upper pressing roller 61 rotates, causing the first connecting rod 45 and the second connecting rod 46 to swing, driving the first driving rod 35 to move repeatedly in the horizontal direction, thereby driving the first closing plate 33 to move repeatedly in the glue delivery barrel 32.During operation, the movement directions of the first and second closing plates 33, 34 remain opposite. When the first closing plate 33 moves forward, the second closing plate 34 moves backward. At this time, the volume of the second cavity 322 decreases, and the glue in the second cavity 322 is pressed into the glue spraying tube 38 and sprayed onto the slab by the nozzle 39. At the same time, the volume of the first and third cavities 321, 323 increases, sucking the glue in the glue storage box 31 into the first and second cavities 321, 322. When the first closing plate 33 moves backward, the second closing plate 34 moves forward. At this time, the volume of the second cavity 322 increases, sucking the glue in the glue storage box 31 into the second cavity 322. At the same time, the volume of the first and third cavities 321, 323 decreases, and the glue in the first and third cavities 321, 323 is pressed into the glue spraying tube 38 and sprayed onto the slab by the nozzle 39. In this way, the glue is sprayed repeatedly by the glue spraying mechanism 3, so that the glue spraying on the surface of the slab is more uniform, thereby improving the bonding effect of the sticker.

[0053] In this embodiment, a first connecting shaft 63 is provided between the first connecting seats 43 on both sides, and the end of the second connecting rod 46 is sleeved on the first connecting shaft 63. A second connecting shaft 64 is provided between the second connecting seats 44 on both sides, and the end of the fourth connecting rod 48 is sleeved on the second connecting shaft 64. First guide plates 12 are provided on both sides of the frame 1, and the first guide plates 12 are provided with a plurality of transversely arranged first guide grooves 13. Guide shafts 14 are provided on the first connecting seats 43 and the second connecting seats 44. The guide shafts 14 and the first guide grooves 13 are slidably connected to each other, and the rotating shaft of the laminating roller can also be slidably guided by the first guide grooves 13. The above structure allows the first connecting seats 43 and the second connecting seats 44 to move more smoothly during repetitive movement.

[0054] In this embodiment, the hot pressing roller 51, a rack 52, a second gear 53, and a fifth connecting rod 54 are further included. The second gear 53 is provided at both ends of the rotating shaft of the hot pressing roller 51. The rack 52 is provided on the frame 1. The second gear 53 and the rack 52 are meshed and driven. A second guide plate 15 is provided on the frame 1. The second guide plate 15 is provided with a second guide groove 16. The end of the rotating shaft of the hot pressing roller 51 is slidably connected to the second guide groove 16. One end of the fifth connecting rod 54 is connected to the rotating shaft of the hot pressing roller 51, and the other end of the fifth connecting rod 54 is rotatably connected to the first connecting seat 43. With the above structure, when the first connecting seat 43 repeatedly moves, it drives the fifth connecting rod 54 to repeatedly move horizontally. When the fifth connecting rod 54 translates, the second gear 53 and the rack 52 are meshed and driven, thereby driving the hot pressing roller 51 to repeatedly move horizontally and rotate, further hot pressing the sticker and the sheet blank, making the sticker bond more firmly.

[0055] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A production process of all-bamboo ecological board, characterized in that: The following steps are involved: (1) Sawing bamboo: sawing the bamboo from the root and removing the bamboo leaves on the bamboo stem to obtain the raw material; (2) Splitting bamboo: using a cutting machine to split the bamboo pole in half; (3) Thickening bamboo strips: Use a planing and milling machine to plan and mill the bamboo strips to the specified thickness; (4) Fine planing: Carbonize and dry the bamboo slices of a certain thickness, and then use a planing and milling machine to fine plan the bamboo slices; (5) Pressing the bamboo layer: rolling the bamboo slices with glue, laying the bamboo slices on a hot press, and then hot pressing them with a hot press to obtain a bamboo layer; (6) Peeling: The bamboo material is pressed into a cylindrical shape, and then the cylindrical bamboo material is peeled by a peeling machine to obtain thin bamboo slices; (7) Pressing the heavy bamboo layer: Roll the thin bamboo slices with glue, and then spread the thin bamboo slices on a hot press to press them into a heavy bamboo layer of 1-1.5 mm; (8) Sanding: polish and smooth the surface of the heavy bamboo layer to ensure the flatness of the surface of the heavy bamboo layer; (9) Lamination: Apply glue on the upper surface of the bamboo layer, then cover the heavy bamboo layer on the bamboo layer and send it into a laminating machine for lamination to obtain a slab; (10) Laminating paper: feeding the slab into the laminating machine, laminating the laminating paper on the outer surface of the heavy bamboo layer; (11) Edge sawing: Edge sawing of the eco-board according to relevant dimensions; (12) Inspection: Select, inspect and pack the eco-boards; The sticker machine includes a frame, a conveyor belt, a pressing roller, a glue spraying mechanism and a transmission mechanism. The conveyor belt and the transmission mechanism are installed on the frame. The pressing roller is symmetrically arranged up and down. The two ends of the pressing roller are connected to the transmission mechanism. The transmission mechanism is connected to the glue spraying mechanism. The transmission mechanism drives the pressing roller to rotate and drives the glue spraying mechanism to spray glue. The glue spraying mechanism includes a glue storage box, a glue delivery barrel, a first closing plate, a second closing plate, a first driving rod, a second driving rod, a mounting bracket, a glue spraying hose and a nozzle. The glue storage box and the mounting bracket are installed on the frame, and the glue delivery barrel is symmetrically arranged on both sides of the frame. The first closing plate and the second closing plate are arranged in the glue delivery barrel. The first closing plate and the second closing plate divide the interior of the glue delivery barrel into a first cavity, a second cavity and a third cavity. The end of the first driving rod is connected to the first closing plate, and the end of the second driving rod is connected to the second closing plate. The first driving rod passes through the interior of the second driving rod and is slidably connected. The first cavity, the second cavity and the third cavity are connected to the glue storage box through a feed pipe, and the first cavity, the second cavity and the third cavity are connected to the glue spraying hose through a discharge pipe. The glue spraying hose is connected to the mounting bracket, and the nozzles are arranged and distributed at the lower end of the glue spraying hose. During operation, the movement directions of the first closing plate and the second closing plate always remain opposite.

2. The production process of a full bamboo ecological board according to claim 1, characterized in that: The transmission mechanism includes a driving motor and a first gear. The first gear is arranged at both ends of the rotating shaft of the pressing roller. The driving motor is connected to the rotating shaft of the pressing roller through a pulley mechanism.

3. The production process of a full bamboo ecological board according to claim 1, characterized in that: The transmission mechanism also includes a first connecting seat, a second connecting seat, a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. The pressing roller includes an upper pressing roller and a lower pressing roller. The first connecting seat is connected to the end of the first driving rod, and the second connecting seat is connected to the end of the second driving rod. One end of the first connecting rod is fixedly connected to the rotating shaft of the upper pressing roller and the other end of the first connecting rod is rotatably connected to the end of the second connecting rod. The other end of the second connecting rod is rotatably connected to the first connecting seat, one end of the third connecting rod is fixedly connected to the rotating shaft of the lower pressing roller and the other end of the third connecting rod is rotatably connected to the end of the fourth connecting rod, and the other end of the fourth connecting rod is rotatably connected to the second connecting seat.

4. The production process of a full bamboo ecological board according to claim 3, characterized in that: A first connecting shaft is provided between the first connecting seats on both sides, and the end of the second connecting rod is sleeved on the first connecting shaft. A second connecting shaft is provided between the second connecting seats on both sides, and the end of the fourth connecting rod is sleeved on the second connecting shaft.

5. The production process of a full bamboo ecological board according to claim 4, characterized in that: First guide plates are provided on both sides of the frame. A plurality of transversely arranged first guide grooves are provided on the first guide plates. Guide shafts are provided on the first connecting seat and the second connecting seat. The guide shafts are slidably connected to the first guide grooves.

6. The production process of a full bamboo ecological board according to claim 3, characterized in that: It also includes a hot pressing roller, a rack, a second gear and a fifth connecting rod. The second gear is arranged at both ends of the rotating shaft of the hot pressing roller, the rack is arranged on the frame, the second gear is engaged with the rack for transmission, a second guide plate is provided on the frame, a second guide groove is provided on the second guide plate, the rotating shaft end of the hot pressing roller is slidably connected to the second guide groove, one end of the fifth connecting rod is connected to the rotating shaft of the hot pressing roller and the other end of the fifth connecting rod is rotatably connected to the first connecting seat.

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