Drying equipment and drying process for producing coated white board paper from wood fibers

Abstract

The invention discloses drying equipment and a drying process for producing coated white board paper from wood fibers, and the drying equipment comprises a base and a compression roller, the top of the base is connected with a drying box through supporting legs, a drying inner box is arranged in the drying box, the top of the drying inner box is communicated with a filter box, a drying assembly is arranged in the drying box, and the drying assembly comprises a first air pipe and a second air pipe. The first air pipe and the second air pipe are both arranged in the drying inner box, the two sets of pressing rollers are rotationally connected into the drying inner box and extrude paper entering the drying inner box, and through the cooperative work mode of the electric heating fan and the fan, the two faces of the paper are dried at the same time; hot air generated by the electric heating fan firstly heats and dries the top of the paper, the fan extracts waste heat in the drying inner box and conveys the waste heat to the second air pipe, the bottom of the paper is heated and dried, the two faces of the paper are evenly heated, the water content decreasing speed is basically consistent, and the problems of paper warping, wrinkling and the like caused by uneven drying are effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of drying coated white board paper produced by wood fiber, and in particular relates to drying equipment and a drying process for producing coated white board paper by wood fiber. Background Art

[0002] Wood fiber is one of the commonly used raw materials in making coated white board paper. As an important packaging and printing paper, coated white board paper is widely used in modern industrial and commercial fields. It has good printability and can present clear and bright printing effects. Therefore, it is often used to make various packaging boxes, labels, brochure covers, etc. In the manufacturing process of coated white board paper, the paper sheets still contain a lot of moisture after being formed in the wire part. Generally, the wet paper sheets must be dehydrated by a dehydrating device and then dried by a drying equipment to keep the wet paper sheets dry.

[0003] Existingly, when drying paper sheets, the wet paper sheets need to be passed through a drying box, and the hot air from the hot air blower is transferred to the wet paper sheet surface through an air hood, so that the water on the paper sheet surface can be quickly evaporated. However, during the drying process, since the hot air from the hot air blower blows and dries the paper sheet surface in one direction through the hot air pipe, the two sides (top and bottom) of the paper sheet are heated and dried unevenly, and the side that dries faster will shrink faster, so that the paper bends toward this side, so that the uneven drying will cause the paper to warp, wrinkle and other problems, thereby reducing product quality. Summary of the invention

[0004] The object of the present invention is to provide a drying device and a drying process for producing coated white board paper from wood fiber, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a drying device for producing coated white paper from wood fiber, comprising:

[0006] A base, the top of the base is connected to a drying box through supporting legs, the drying box is provided with a drying inner box for drying paper, the top of the drying inner box is connected to a filter box for filtering hot air blown into the drying inner box, a drying component is provided in the drying box, the electric hot air blower of the drying component blows hot air into the drying inner box to heat and dry the top of the paper, and then the fan on the surface of the drying inner box draws the residual heat in the drying inner box, so that the residual heat drawn by the fan is used to heat and dry the bottom of the paper;

[0007] The pressing rollers are provided with two groups and both groups of pressing rollers are rotatably connected in the drying box for pressing the paper entering the drying box. A collecting box for collecting the water squeezed out of the paper is provided at the bottom of the drying box.

[0008] Preferably, the drying component includes a first air duct and a second air duct, the first air duct and the second air duct are both arranged in the drying inner box, the first air duct is connected to the filter box through a main pipe, the electric hot air blower is arranged on the top of the drying box and the air outlet of the electric hot air blower is connected to the filter box through a connecting pipe.

[0009] Preferably, the air inlet end of the fan is connected to the top side of the drying inner box through a bend pipe, and one end of the bend pipe located inside the drying inner box is connected to the air inlet hood, and the air outlet end of the fan is connected to the second air duct at the bottom of the drying inner box through a pipeline.

[0010] Preferably, a plurality of air outlets are evenly distributed on the surfaces of the first air duct and the second air duct, and a mesh plate is provided at the air outlet end of the air outlet in the drying inner box.

[0011] Preferably, two groups of rotating frames are connected in the drying box, and one group of pressure rollers is rotatably connected between the two groups of rotating frames through bearings, and both ends of the other group of pressure rollers are rotatably connected to adjustment blocks through bearings. A cylinder is provided on the top of the rotating frame, and the piston rod of the cylinder movably passes through the rotating frame and is connected to the adjustment block. A guide rod is connected in the rotating frame, and the adjustment block is slidably sleeved on the surface of the guide rod.

[0012] Preferably, a drainage plate is connected to the bottom of the rotating frame in the drying box, a groove is provided in the drying box at one end of the drainage plate, and the collecting box is connected to the groove through a pipeline.

[0013] Preferably, two sets of sleeves are horizontally arranged on one side of the drying box, and sliding rods are slidably connected in the sleeves, a spring is connected between the sliding rod and the sleeves, and one end of the sliding rod located outside the sleeve is rotatably connected to a leveling roller.

[0014] Preferably, the other side of the drying box is rotatably connected to a winding roller via a bracket, and one end of the paper passes through the drying box and the opening on the surface of the drying inner box and is connected to the surface of the winding roller.

[0015] Preferably, a heat-insulating pad is provided on the inner wall of the drying inner box, and two groups of filter plates are slidably inserted in the filter box.

[0016] A drying process of a drying device for producing coated white paperboard from wood fiber, using the above drying device for producing coated white paperboard from wood fiber, comprising the following steps:

[0017] S1. Turn on the drying equipment, preheat the entire equipment, and then add the material to the paper and transport it into the drying inner box;

[0018] S2, after conveying, two sets of pressing rollers squeeze the moisture in the paper, and the squeezed moisture is drained into the groove through the drainage plate and collected by the collection box;

[0019] S3, the hot air generated by the electric hot air blower enters the filter box through the connecting pipe, is filtered by the filter box, and the filtered hot air enters the first air duct through the main pipe and is evenly blown to the top of the paper through the air outlet nozzle, while the hot air pumped by the fan blows the residual heat to the bottom of the paper through the air outlet nozzle on the surface of the second air duct, so that both sides of the paper are dried at the same time;

[0020] S4. After the paper is dried, it continues to move toward the exit of the drying inner box, and one end of the paper passes through the opening on the other side of the drying box and is wound around the surface of the winding roller and is wound up by the winding roller.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention uses an electric heating blower and a fan to work together to achieve simultaneous drying of both sides of the paper. The hot air generated by the electric heating blower first heats and dries the top of the paper, and then the fan extracts the residual heat in the drying inner box and transports it to the second air duct to heat and dry the bottom of the paper. As a result, both sides of the paper are heated evenly and the water content decreases at a substantially consistent rate, effectively reducing problems such as paper warping and wrinkling caused by uneven drying.

[0023] (2) The gap between the two sets of rollers in the equipment is adjustable through components such as a rotating frame, a cylinder, an adjustment block and a guide rod. The operator can easily adjust the gap between the rollers according to the actual conditions such as the thickness and moisture content of the paper to achieve the best squeezing and dewatering effect. The squeezed water is drained into the groove by the drainage plate and collected by the collection box for subsequent processing.

[0024] (3) The filter box can filter impurities in the hot air to prevent impurities from adhering to the surface of the paper and affecting the quality of the paper, thereby ensuring the cleanliness of the paper. After long-term use, when a large amount of impurities accumulate on the filter plate and affect the filtering effect, the operator can open the hinged door on the surface of the filter box and easily pull out the filter plate for cleaning or replacement, ensuring that the filter box always maintains good filtering performance, thereby ensuring the normal operation of the drying equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the pressure roller and the rotating frame of the present invention;

[0028] Figure 4 It is a cross-sectional view of the pressure roller and the rotating frame of the present invention;

[0029] Figure 5It is a schematic diagram of the structure inside the filter box of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure inside the sleeve of the present invention.

[0031] In the figure: 1. base; 2. drying box; 3. paper; 4. drying inner box; 5. main pipe; 6. filter box; 7. electric heating blower; 8. blower; 9. pressure roller; 10. collecting box; 11. first air duct; 12. second air duct; 13. connecting pipe; 14. elbow; 15. air inlet cover; 16. air outlet nozzle; 17. mesh plate; 18. rotating frame; 19. adjusting block; 20. cylinder; 21. guide rod; 22. guide plate; 23. sleeve; 24. slide rod; 25. spring; 26. leveling roller; 27. winding roller; 28. insulation pad; 29. ​​filter plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides Figure 1-6 A drying device for producing coated white paper from wood fiber is shown, comprising:

[0034] A base 1, the top of which is connected to a drying box 2 through supporting legs, the drying box 2 is provided with a drying inner box 4 for drying paper 3, the top of the drying inner box 4 is connected to a filter box 6 for filtering hot air blown into the drying inner box 4, a drying component is provided in the drying box 2, and an electric hot air blower 7 of the drying component blows hot air into the drying inner box 4 to heat and dry the top of the paper 3, and then a fan 8 on the surface of the drying inner box 4 draws the residual heat in the drying inner box 4, so that the residual heat drawn by the fan 8 heats and dries the bottom of the paper 3;

[0035] The pressing rollers 9 are provided with two groups and both groups of pressing rollers 9 are rotatably connected to the drying box 2 for pressing the paper 3 entering the drying inner box 4. The bottom of the drying box 2 is provided with a collecting box 10 for collecting the moisture squeezed out of the paper 3.

[0036] The drying component includes a first air duct 11 and a second air duct 12. The first air duct 11 and the second air duct 12 are both arranged in the drying inner box 4. The first air duct 11 is connected to the filter box 6 through the main pipe 5. The electric hot air blower 7 is arranged on the top of the drying box 2 and the air outlet of the electric hot air blower 7 is connected to the filter box 6 through the connecting pipe 13.

[0037] The air inlet end of the fan 8 is connected to the top side of the drying inner box 4 through the bent pipe 14, and one end of the bent pipe 14 located in the drying inner box 4 is connected to the air inlet cover 15. The bent pipe 14 is arranged along the edge of the drying inner box 4 to avoid affecting the discharge of the paper 3.

[0038] The air outlet end of the fan 8 is connected to the second air duct 12 at the bottom of the drying inner box 4 through a pipeline. In actual production, when the top of the paper 3 is heated by the hot air from the electric heating fan 7, the bottom is simultaneously heated by the waste heat from the second air duct 12, so that the whole paper 3 is heated more evenly, thereby improving the drying speed and quality. At the same time, this waste heat utilization method reduces energy waste and improves energy utilization.

[0039] A plurality of air outlets 16 are evenly distributed on the surfaces of the first air duct 11 and the second air duct 12. A mesh plate 17 is provided at the air outlet end of the air outlet nozzle 16 in the drying inner box 4. The hot air blown out of the air outlet nozzle 16 is dispersed by the mesh plate 17 to avoid damage to the paper 3 caused by the hot air blown out of the air outlet nozzle 16.

[0040] Two groups of rotating frames 18 are connected in the drying box 2, and one group of pressure rollers 9 is rotatably connected between the two groups of rotating frames 18 through bearings, and the other group of pressure rollers 9 are rotatably connected to adjusting blocks 19 at both ends through bearings. A cylinder 20 is provided on the top of the rotating frame 18, and the piston rod of the cylinder 20 movably penetrates the rotating frame 18 and is connected to the adjusting block 19. A guide rod 21 is connected in the rotating frame 18, and the adjusting block 19 is slidably sleeved on the surface of the guide rod 21. The guide rod 21 is connected in the rotating frame 18, and can provide a precise sliding track for the adjusting block 19 when the adjusting block 19 moves, thereby ensuring the stability of the pressure roller 9 when moving.

[0041] A drainage plate 22 is connected to the drying box 2 and located at the bottom of the rotating frame 18. A groove is provided in the drying box 2 and located at one end of the drainage plate 22. The collecting box 10 is connected to the groove through a pipeline. A drainage pipe is connected to one side of the bottom of the collecting box 10. When the water collected in the collecting box 10 needs to be discharged, it can be discharged through the drainage pipe.

[0042] Two groups of sleeves 23 are horizontally arranged on one side of the drying box 2, and a slide bar 24 is slidably connected in the sleeve 23. A spring 25 is connected between the slide bar 24 and the sleeve 23. One end of the slide bar 24 located outside the sleeve 23 is rotatably connected to a leveling roller 26. When paper 3 of different thicknesses passes between the two groups of sleeves 23, the combination of the spring 25 and the slide bar 24 can achieve adaptive adjustment. For thicker paper 3, the paper 3 will push up the leveling roller 26, and the slide bar 24 slides upward in the sleeve 23, and the spring 25 is compressed. At this time, the elastic force of the spring 25 increases, ensuring that the leveling roller 26 can still be in close contact with the paper 3, and applying sufficient pressure to level the paper 3.

[0043] The other side of the drying box 2 is rotatably connected to a winding roller 27 through a bracket. One end of the paper 3 passes through the openings on the surface of the drying box 2 and the drying inner box 4 and is connected to the surface of the winding roller 27. When the paper 3 is dried, the winding roller 27 is driven by an external motor to wind up the dried paper 3 at a suitable speed.

[0044] The inner wall of the drying inner box 4 is provided with a heat preservation pad 28, and two groups of filter plates 29 are slidably inserted in the filter box 6. The filling materials in the two groups of filter plates 29 are glass fiber filter paper and activated carbon respectively. The glass fiber filter paper can withstand high temperature without being damaged and effectively filter out tiny particle impurities in the hot air. The activated carbon can not only filter out the particle impurities in the hot air, but also absorb the odor and organic volatiles in the hot air.

[0045] A drying process of a drying device for producing coated white paperboard from wood fiber, using the above drying device for producing coated white paperboard from wood fiber, comprising the following steps:

[0046] S1, start the drying equipment, preheat the whole equipment, and then add the material to the paper 3 and convey it into the drying inner box 4;

[0047] S2, after conveying, the two groups of pressing rollers 9 squeeze the water in the paper 3, and the squeezed water is drained into the groove through the drainage plate 22 and collected by the collection box 10;

[0048] S3, the hot air generated by the electric hot air blower 7 enters the filter box 6 through the connecting pipe 13, is filtered by the filter box 6, and the filtered hot air enters the first air duct 11 through the main pipe 5 and is evenly blown to the top of the paper 3 through the air outlet 16, while the hot air pumped by the fan 8 blows the residual heat to the bottom of the paper 3 through the air outlet 16 on the surface of the second air duct 12, so that both sides of the paper 3 are dried at the same time;

[0049] S4, after the paper 3 is dried, it continues to move toward the exit of the drying inner box 4, one end of which passes through the opening on the other side of the drying box 2 and is wound around the surface of the winding roller 27 and is wound up by the winding roller 27.

[0050] In the drying equipment and drying process for producing coated white paper from wood fiber, the paper 3 passes through two sets of sleeves 23 on one side of the drying box 2. Under the action of the spring 25, the slide bar 24 drives the leveling roller 26 to be in close contact with the paper 3. When the paper 3 moves, the leveling roller 26 performs preliminary leveling on the paper 3 to remove some wrinkles and uneven parts on the surface, so that the paper 3 enters the drying inner box 4 in a relatively flat state. This pretreatment step is conducive to the uniform transfer of heat and uniform drying of the paper 3 in the subsequent drying process.

[0051] After passing through the leveling roller 26, the paper 3 continues to move forward to between the two groups of pressing rollers 9. According to the thickness, moisture content and required drying degree of the paper 3, the cylinder 20 is started, and the piston rod of the cylinder 20 pushes the adjustment block 19 to slide along the guide rod 21, so as to adjust the gap between the two groups of pressing rollers 9, so that the pressing rollers 9 apply a suitable pressure to the paper 3. Under the squeezing action of the pressing rollers 9, part of the moisture in the paper 3 is squeezed out, and the squeezed moisture flows along the guide plate 22. The guide plate 22 guides the moisture to the groove set in the drying box 2, and then flows into the collecting box 10 through the pipeline for collection. The squeezing and dehydration process of the pressing rollers 9 can further reduce the moisture content of the paper 3 and improve the drying efficiency. At the same time, the collecting box 10 collects the moisture to prevent the moisture from accumulating in the drying box 2 and affecting the drying effect.

[0052] The electric hot air blower 7 is started, and the hot air generated by the electric hot air blower 7 enters the filter box 6 through the connecting pipe 13. In the filter box 6, the hot air is filtered by two groups of filter plates 29 to remove tiny particles such as dust and impurities therein, so as to ensure that the hot air entering the first air duct 11 is pure. The filtered hot air enters the first air duct 11 through the main pipe 5. The hot air in the first air duct 11 is evenly blown to the top of the paper 3 through a plurality of air outlets 16 evenly distributed on the surface of the first air duct 11, so as to heat and dry the paper 3. At this time, according to the water content of the paper 3, the drying speed requirements, etc., the temperature and air volume of the hot air are controlled by adjusting the power of the electric hot air blower 7;

[0053] At the same time, the fan 8 is started, and the fan 8 extracts the residual heat from the top of the drying inner box 4 through the curved pipe 14 and the air inlet cover 15, and then transmits the residual heat to the second air duct 12 at the bottom of the drying inner box 4 through the pipeline, and the air outlet 16 on the surface of the second air duct 12 blows the residual heat to the bottom of the paper 3, so as to achieve heating and drying of the bottom of the paper 3. In this process, by adjusting the speed of the fan 8, the amount of residual heat extracted and the amount of air blown to the bottom of the paper 3 can be controlled, so that the upper and lower surfaces of the paper 3 are heated evenly;

[0054] During the drying process of the paper 3, the temperature and humidity sensor (not shown in the drawings) in the drying inner box 4 monitors the temperature in the drying inner box 4 and the changes in the moisture content of the paper 3 in real time. When the moisture content at the top of the paper 3 decreases and the temperature increases, the power of the electric heating fan 7 is appropriately reduced. At the same time, the rotation speed of the fan 8 is adjusted according to the residual heat at the bottom and the moisture content at the bottom of the paper 3 to ensure that the drying speed and moisture content of both sides of the paper 3 are consistent, so as to avoid the situation where one side dries too fast and the other side dries too slowly.

[0055] When the paper 3 reaches a predetermined degree of dryness, the paper 3 continues to move from the exit of the drying inner box 4, and the winding roller 27 is driven by an external motor to wind up the dried paper 3 at a suitable rotation speed.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drying device for producing coated white paper from wood fiber, characterized in that: include: A base (1), the top of the base (1) is connected to a drying box (2) via supporting legs, the drying box (2) is provided with a drying inner box (4) for drying paper (3), the top of the drying inner box (4) is connected to a filter box (6) for filtering hot air blown into the drying inner box (4), the drying box (2) is provided with a drying component, the electric hot air blower (7) of the drying component blows hot air into the drying inner box (4) to heat and dry the top of the paper (3), and then the fan (8) on the surface of the drying inner box (4) draws the residual heat in the drying inner box (4), so that the residual heat drawn by the fan (8) heats and dries the bottom of the paper (3); Pressing rollers (9), wherein two groups of pressing rollers (9) are provided and both groups of pressing rollers (9) are rotatably connected to the drying box (2) and are used to press the paper (3) entering the drying inner box (4); a collecting box (10) is provided at the bottom of the drying box (2) for collecting moisture squeezed out of the paper (3).

2. The drying device for producing coated white paper from wood fiber according to claim 1, characterized in that: The drying component comprises a first air duct (11) and a second air duct (12); the first air duct (11) and the second air duct (12) are both arranged in a drying inner box (4); the first air duct (11) is connected to a filter box (6) via a main pipe (5); the electric hot air blower (7) is arranged on the top of the drying box (2); and the air outlet of the electric hot air blower (7) is connected to the filter box (6) via a connecting pipe (13).

3. The drying device for producing coated white paper from wood fiber according to claim 2, characterized in that: The air inlet end of the fan (8) is connected to one side of the top of the drying inner box (4) through a curved pipe (14), and one end of the curved pipe (14) located inside the drying inner box (4) is connected to an air inlet cover (15), and the air outlet end of the fan (8) is connected to a second air duct (12) at the bottom of the drying inner box (4) through a pipeline.

4. The drying device for producing coated white paper from wood fiber according to claim 2, characterized in that: A plurality of air outlets (16) are evenly distributed on the surfaces of the first air duct (11) and the second air duct (12), and a mesh plate (17) is provided at the air outlet end of the air outlets (16) in the drying inner box (4).

5. The drying equipment for producing coated white paper from wood fiber according to claim 1, characterized in that: Two groups of rotating frames (18) are connected inside the drying box (2), and one group of pressure rollers (9) is rotatably connected between the two groups of rotating frames (18) through bearings, and the other group of pressure rollers (9) are rotatably connected to adjustment blocks (19) at both ends through bearings. A cylinder (20) is provided on the top of the rotating frame (18), and a piston rod of the cylinder (20) movably penetrates the rotating frame (18) and is connected to the adjustment block (19). A guide rod (21) is connected inside the rotating frame (18), and the adjustment block (19) is slidably sleeved on the surface of the guide rod (21).

6. The drying device for producing coated white paper from wood fiber according to claim 5, characterized in that: A drainage plate (22) is connected to the bottom of the rotating frame (18) in the drying box (2), a groove is provided in one end of the drainage plate (22) in the drying box (2), and the collection box (10) is connected to the groove through a pipeline.

7. The drying device for producing coated white paper from wood fiber according to claim 1, characterized in that: Two groups of sleeves (23) are horizontally arranged on one side of the drying box (2), and a slide rod (24) is slidably connected inside the sleeve (23), a spring (25) is connected between the slide rod (24) and the sleeve (23), and one end of the slide rod (24) located outside the sleeve (23) is rotatably connected to a leveling roller (26).

8. The drying device for producing coated white paper from wood fiber according to claim 1, characterized in that: The other side of the drying box (2) is rotatably connected to a winding roller (27) via a bracket, and one end of the paper (3) passes through the openings on the surface of the drying box (2) and the drying inner box (4) and is then connected to the surface of the winding roller (27).

9. The drying device for producing coated white paper from wood fiber according to claim 1, characterized in that: The inner wall of the drying inner box (4) is provided with a heat-insulating pad (28), and two groups of filter plates (29) are slidably inserted in the filter box (6).

10. A drying process of a drying device for producing coated white paper from wood fiber, characterized in that: A drying device for producing coated white board paper using wood fiber according to any one of claims 1 to 9 comprises the following steps: S1, start the drying equipment, preheat the entire equipment, and then add the material to the paper (3) and convey it into the drying inner box (4); S2, after conveying, two groups of pressing rollers (9) squeeze the water in the paper (3), and the squeezed water is drained into the groove through the drainage plate (22) and collected by the collection box (10); S3, the hot air generated by the electric hot air blower (7) enters the filter box (6) through the connecting pipe (13), is filtered by the filter box (6), and the filtered hot air enters the first air duct (11) through the main pipe (5) and is evenly blown to the top of the paper (3) through the air outlet (16), while the hot air pumped by the fan (8) passes through the air outlet (16) on the surface of the second air duct (12) to blow the residual heat to the bottom of the paper (3), so that both sides of the paper (3) are dried simultaneously; S4. After the paper (3) is dried, it continues to move toward the exit of the drying inner box (4), and one end thereof passes through the opening on the other side of the drying box (2) and is wound around the surface of the winding roller (27), and is wound up by the winding roller (27).

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