Preheating device for corrugated paper production

Abstract

The invention provides a preheating device for corrugated paper production, and relates to the technical field of corrugated paper. The device comprises a plurality of heating roller sets, a plurality of corrugated roller sets, a plurality of compression roller sets, a plurality of rubber roller sets and a plurality of compression joint rollers which are sequentially arranged on a corrugated paper conveying track, infrared temperature measurement sensors located on the side portion of the corrugated paper conveying track are arranged between the corrugated roller sets and the heating roller sets, and the corrugated roller sets comprise upper corrugated rollers and lower corrugated rollers which are arranged in parallel. The upper corrugating roller and the lower corrugating roller are assembled in a paired and meshed mode, the corrugating roller set adopts electromagnetic induction heating, the pressing roller set is arranged on the periphery of the lower corrugating roller, the pressing roller set is provided with a plurality of roller teeth meshed with teeth of the lower corrugating roller, the glue roller set coats glue on corrugation peaks of corrugated paper passing through the pressing roller set on the lower corrugating roller, and the crimping roller is located on the side portion of the lower corrugating roller. And the pressing roller is used for pressing and bonding the surface paper and the corrugated peaks of the glued corrugated paper. Corrugated paper is preheated step by step, a secondary shaping measure is set, and the forming quality of the corrugated paper is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of corrugated paper technology, and more specifically to a preheating device for corrugated paper production. Background Technology

[0002] Corrugated paper is a sheet-like material made by bonding linerboard and corrugated paper formed by corrugating rollers. It is generally divided into single-wall and double-wall corrugated paperboard, and further classified into five types according to the size of the corrugations: A, B, C, E, and F. Corrugated paper has been invented and used for over a century. It boasts advantages such as low cost, light weight, easy processing, high strength, excellent printability, and convenient storage and handling. Over 80% of corrugated paper can be recycled. It is widely used for packaging food and digital products, making it relatively environmentally friendly.

[0003] In the existing technology, when preheating and gluing corrugated paper for bonding, the preheating and forming process is often carried out in a set of corrugated rollers. This causes the corrugated paper to heat up suddenly, making it easy to deform and affecting the forming effect. Furthermore, the lack of secondary shaping of the corrugated paper results in uncontrollable forming quality. Summary of the Invention

[0004] The purpose of this invention is to develop a preheating device for corrugated paper production that preheats corrugated paper in stages and incorporates secondary shaping measures to ensure the quality of corrugated paper forming.

[0005] This invention is achieved through the following technical solution:

[0006] A preheating device for corrugated paper production, comprising:

[0007] Multiple sets of heating rollers, corrugated rollers, pressure rollers, glue rollers, and pressing rollers are sequentially arranged on the corrugated paper conveying track;

[0008] An infrared temperature sensor located on the side of the corrugated paper conveying track is provided between the corrugated roll group and the heating roll group. The corrugated roll group includes an upper corrugated roll and a lower corrugated roll arranged in parallel. The upper corrugated roll and the lower corrugated roll are paired and meshed. The corrugated roll group is heated by electromagnetic induction.

[0009] The pressure roller assembly is located around the lower corrugated roller, and the pressure roller assembly has multiple roller teeth that mesh with the teeth of the lower corrugated roller;

[0010] The glue roller group applies glue to the corrugated paper peaks after passing through the pressure roller group on the lower corrugated roller. The pressing roller is located on the side of the lower corrugated roller and presses and bonds the face paper to the glued corrugated paper peaks.

[0011] Optionally, the heating roller assembly includes two parallel heating rollers, the distance between the two heating rollers being adapted to the thickness of the corrugated paper, and the heating rollers are internally heated by electric heating, heat transfer oil heating, or steam heating.

[0012] Optionally, both the upper and lower corrugated rollers have cavities inside, and an electromagnetic coil coaxial with the upper or lower corrugated roller is installed inside the cavity.

[0013] Optionally, the pressure roller assembly includes a fixed shaft parallel to the lower corrugated roller, a roller is coaxially rotatably sleeved on the outer wall of the fixed shaft, a drive source for driving the roller to rotate is provided at the end of the fixed shaft, a plurality of roller teeth are evenly arranged on the outer circumference of the roller, and the rotational speed of the roller is adapted to the conveying speed of the corrugated paper.

[0014] Optionally, the roller teeth are hollow cover structures made of rubber, and the roller teeth are connected to the roller and have a closed cavity inside, which is filled with heat-conducting oil.

[0015] Optionally, a metal top block is provided on the roller inside the cavity of the roller teeth. The shape of the top block is adapted to the roller teeth. The outer wall of the top block is equidistant from the inner wall of the roller teeth. A heating cover is provided on the outer side of the roller away from the lower corrugated roller. An electromagnetic coil is provided on the inner wall of the heating cover.

[0016] Optionally, the top block is provided with a slider at its bottom, and the roller is provided with a groove whose position is adapted to the slider. The groove is arranged radially along the roller, and the slider slides and the groove are slidably sealed. The roller and the fixed shaft are provided with a drive mechanism to drive the slider to slide.

[0017] Optionally, the driving mechanism includes a plurality of spherical protrusions evenly spaced at the bottom of the slider. An annular groove is formed on the inner wall of the roller where the protrusions are located. A spherical push block that cooperates with the protrusions is provided on the outer wall of the fixed shaft inside the annular groove. The push block is located on the line connecting the fixed shaft and the axis of the lower corrugated roller.

[0018] Optionally, the glue roller assembly includes a glue tank, in which a glue-applying roller parallel to the lower corrugated roller is rotatably arranged. The glue-applying roller rotates in the opposite direction to the lower corrugated roller. The lower circumferential outer wall of the glue-applying roller is in contact with the glue in the glue tank. A heating element for maintaining the temperature of the glue is correspondingly provided in the glue tank.

[0019] Optionally, a control roller parallel to the coating roller is rotatably provided inside the glue tank. The coating roller and the control roller rotate in the same direction, and the distance between the coating roller and the control roller is adapted to the thickness of the glue on the coating roller.

[0020] The beneficial effects of this invention are:

[0021] This invention uses multiple sets of heating rollers to heat the corrugated paper in stages, gradually increasing its temperature to prevent deformation caused by sudden heating. Before entering the corrugated roller assembly, the paper's temperature is detected, and the assembly then controls the temperature based on the heated paper's temperature. The heat source for the roller assembly is electromagnetic induction heating, allowing for rapid temperature control. This control ensures a more uniform temperature for the corrugated paper within the assembly, preventing uneven temperature distribution that could lead to deformation or affect subsequent bonding with the face paper. The corrugated paper is then conveyed on the lower corrugated roller after forming. In the process, the roller teeth of multiple pressure roller groups enter the corrugated paper between the teeth of the lower corrugated roller. The roller teeth are made of rubber and filled with heat-conducting oil. Their uniform expansion ensures that they are evenly stressed with the corrugated paper, further shaping the corrugated paper and ensuring that the shape and specifications of the corrugated paper meet the standards. The roller teeth have an elastic expansion mechanism, which will not damage the corrugated paper. Furthermore, the top block heats the heat-conducting oil, so that the temperature of the roller teeth matches that of the lower corrugated roller, avoiding temperature differences on both sides of the corrugated paper on the lower corrugated roller. The glue roller group works with the glue application roller and the control roller to ensure that the glue is evenly applied to the crests of the corrugated paper. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of the present invention;

[0024] Figure 2 This is a diagram of the internal structure of the pressure roller assembly.

[0025] Reference numerals: 100, Heating roller assembly; 101, Heating roller; 200, Corrugated roller assembly; 201, Upper corrugated roller; 202, Lower corrugated roller; 300, Pressure roller assembly; 301, Roller teeth; 302, Heating cover; 303, Top block; 304, Roller; 305, Annular groove; 306, Fixed shaft; 307, Protrusion; 308, Push block; 309, Slider; 310, Slide groove; 400, Glue roller assembly; 401, Glue coating roller; 402, Control roller; 403, Glue trough; 500, Pressing roller; 600, Infrared temperature sensor. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, this invention discloses a preheating device for corrugated paper production, comprising three sets of heating rollers 100, corrugated rollers 200, pressure rollers 300, glue rollers 400, and pressing rollers 500 arranged sequentially on the corrugated paper conveying track. They are arranged parallel to each other on the machine body or frame (not shown in the figure), and their rotation speed is adapted to the conveying speed of the corrugated paper. After being heated by the three sets of heating rollers 100, the corrugated paper enters the corrugated rollers 200 for forming. The pressure rollers 300 assist the corrugated rollers 200 in forming the corrugated paper. The glue rollers 400 apply glue to the corrugated paper. The face paper enters the pressing rollers 500, and the face paper and corrugated paper are bonded together under the pressure of the pressure rollers 300 and the pressing rollers 500.

[0030] The heating roller assembly 100 serves to heat the corrugated paper in stages and guide its conveying, ensuring that the corrugated paper enters the corrugated roller assembly 200 along a designated path. The heating roller assembly 100 includes two parallel heating rollers 101, with the distance between the two heating rollers 101 adapted to the thickness of the corrugated paper. The heating rollers 101 are heated internally by electric heating, heat transfer oil heating, or steam heating. When heated electrically, multiple heating resistors are evenly arranged inside the heating roller 101. When heated by heat transfer oil, a flow channel is provided inside the heating roller 101 to circulate the heat transfer oil. When heated by steam, a cavity is provided inside the heating roller 101 to allow steam to enter.

[0031] The corrugated roll assembly 200 includes an upper corrugated roll 201 and a lower corrugated roll 202 arranged in parallel. The upper corrugated roll 201 and the lower corrugated roll 202 are paired and meshed. When the corrugated paper passes between the upper corrugated roll 201 and the lower corrugated roll 202, it is pressed and shaped by the teeth of the upper corrugated roll 201 and the lower corrugated roll 202. After passing around the lower corrugated roll 202, the corrugated paper passes through the pressure roll assembly 300 and the glue roll assembly 400 before being pressed against the face paper on the pressing roll 500. The corrugated roll assembly 200 is heated by electromagnetic induction. Both the upper corrugated roll 201 and the lower corrugated roll 202 have cavities inside, and each cavity contains an electromagnetic coil coaxial with the corresponding upper corrugated roll 201 or lower corrugated roll 202.

[0032] An infrared temperature sensor 600 is installed between the corrugated roll assembly 200 and the heating roll assembly 100. The infrared temperature sensor 600 is fixed on the machine body or frame. The infrared temperature sensor 600 performs non-contact temperature measurement on the corrugated paper and sets a standard temperature range. When the measured temperature of the corrugated paper is higher than the standard temperature range, the corrugated roll assembly 200 reduces the electromagnetic induction heating power. Conversely, when the measured temperature of the corrugated paper is lower than the standard temperature range, the corrugated roll assembly 200 increases the electromagnetic induction heating power for temperature compensation.

[0033] In this embodiment, two pressure roller groups 300 are provided. The pressure roller groups 300 perform secondary pressing on the corrugated paper after it has been pressed and shaped by the upper corrugated roller 201 and the lower corrugated roller 202, so that the shape of the corrugated paper is further qualified. The two pressure roller groups 300 are located around the lower corrugated roller 202. The pressure roller group 300 includes a fixed shaft 306 parallel to the lower corrugated roller 202. A roller 304 is coaxially rotatably sleeved on the outer wall of the fixed shaft 306. The end of the fixed shaft 306 is provided with a drive source (not shown in the figure) for driving the roller 304 to rotate. The outer wall of the roller 304 is provided with four roller teeth 301. The four roller teeth 301 are arranged at equal intervals in the circumferential direction of the roller 304. The roller teeth 301 mesh with the teeth of the lower corrugated roller 202. The rotation speed of the roller 304 is adapted to the conveying speed of the corrugated paper. The gaps between two adjacent teeth on the lower corrugated roller 202 are all embedded by the roller teeth 301.

[0034] The roller tooth 301 is a hollow cover structure made of rubber, such as fluororubber or silicone rubber, which allows for elastic expansion and contraction. The roller tooth 301 is connected to the roller 304, and its interior is a closed cavity filled with heat-conducting oil. A metal top block 303 is slidably mounted on the roller 304 inside the cavity, which can slide radially along the roller 304. The shape of the top block 303 is adapted to the roller tooth 301, and the outer wall of the top block 303 is equidistant from the inner wall of the roller tooth 301. A slider 309 is provided at the bottom of the top block 303, and a groove 310 is provided on the roller 304, which is positioned to match the slider 309. The slider 309 and the groove 310 slide and seal, and the top block 303 can slide radially along the roller 304 through the sliding cooperation between the slider 309 and the groove 310.

[0035] Along the axial direction of the roller 304, multiple spherical protrusions 307 are evenly spaced at the bottom of the slider 309. An annular groove 305 is formed on the inner wall of the roller 304 where the protrusions 307 are located. A push block 308, which mates with the protrusions 307, is provided on the outer wall of the fixed shaft 306 inside the annular groove 305. The push block 308 is also spherical and is located on the line connecting the fixed shaft 306 and the axis of the lower corrugated roller 202. When the roller 304 rotates and the protrusions 307 slide to the push block 308, the protrusions 307 are compressed by the push block 308. The pusher 307 slides radially away from the axis of the roller 304, causing the top block 303 to continuously slide into the roller tooth 301. The volume of the cavity inside the roller tooth 301 decreases, the pressure of the heat transfer oil increases, and the roller tooth 301 expands uniformly. Since the pusher 308 is located on the line connecting the axis of the fixed shaft 306 and the axis of the lower corrugated roller 202, the roller tooth 301 expands only when it is embedded between the two teeth of the lower corrugated roller 202. The expanded roller tooth 301 meshes with the teeth of the lower corrugated roller 202 to press the corrugated paper. As the roller 304 rotates, the roller teeth 301 gradually disengage from the lower corrugated roller 202, and the protrusion 307 gradually slides away from the pusher block 308. Under the pressure of the heat-conducting oil inside the roller teeth 301, the top block 303 slides radially towards the axis of the roller 304 until the protrusion 307 slides into contact with the outer wall of the fixed shaft 306 within the annular groove 305. The pusher block 308, the protrusion 307, and the cooperating annular groove 305, as the driving mechanism, cause the roller teeth 301 to expand when embedded between the teeth of the lower corrugated roller 202. The expanded roller teeth 301 make uniform contact with the corrugated paper and push it against the teeth of the lower corrugated roller 202, so that the corrugated paper on the lower corrugated roller 202 further meets the forming requirements, ensuring that the shape and size of the corrugated paper meet the standards and that there are no protrusions or irregular shapes.

[0036] A heating cover 302 is provided on the outer side of the roller 304 away from the lower corrugated roller 202. An electromagnetic coil is provided on the inner wall of the heating cover 302 to electromagnetically induction heat the top block 303. The top block 303 heats the heat transfer oil, which in turn heats the roller teeth 301, making the temperature of the roller teeth 301 match the temperature of the lower corrugated roller 202, avoiding or reducing the temperature difference between the two sides of the corrugated paper. An aluminum plate is provided on the outer wall of the heating cover 302 away from the roller 304 for electromagnetic shielding. The diameter of the circular trajectory of the outer end of the roller teeth 301 is large enough. The electromagnetic coil on the inner wall of the heating cover 302 is at a safe distance from the lower corrugated roller 202, that is, the electromagnetic induction effect is weak and negligible.

[0037] The glue roller assembly 400 applies glue to the crests of the formed corrugated paper. The glue roller assembly 400 includes a glue tank 403. A glue-applying roller 401 and a control roller 402, parallel to the lower corrugating roller 202, are rotatably disposed within the glue tank 403. The glue-applying roller 401 rotates in the opposite direction to the lower corrugating roller 202, while the control roller 402 rotates in the same direction. The outer diameter of the control roller 402 is smaller than that of the glue-applying roller 401. The lower circumferential outer wall of the glue-applying roller 401 contacts the glue in the glue tank 403. A corresponding element for maintaining the glue temperature is provided within the glue tank 403. The hot component has a spacing between the coating roller 401 and the control roller 402 that is adapted to the thickness of the glue on the coating roller 401. After the coating roller 401 rotates and the glue in the glue tank 403 is adhered, the adhered glue passes between the control roller 402 and the coating roller 401. The control roller 402 scrapes off the glue that exceeds the standard thickness, so that the glue thickness on the coating roller 401 is uniform and meets the standard after passing through the control roller 402. The corrugated paper on the lower corrugated roller 202 comes into contact with the glue on the coating roller 401, so that the glue is applied to the corrugated paper.

[0038] After the face paper is fed into the pressing roller 500, it is pressed and bonded to the corrugated paper crest coated with glue on the lower corrugated roller 202. The conveying speed of the face paper on the pressing roller 500 is matched with the conveying speed of the corrugated paper crest.

[0039] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A preheating device for corrugated paper production, characterized in that, include: Multiple sets of heating rollers, corrugated rollers, pressure rollers, glue rollers, and pressing rollers are sequentially arranged on the corrugated paper conveying track; An infrared temperature sensor located on the side of the corrugated paper conveying track is provided between the corrugated roll group and the heating roll group. The corrugated roll group includes an upper corrugated roll and a lower corrugated roll arranged in parallel. The upper corrugated roll and the lower corrugated roll are paired and meshed. The corrugated roll group is heated by electromagnetic induction. The pressure roller assembly is located around the lower corrugated roller, and the pressure roller assembly has multiple roller teeth that mesh with the teeth of the lower corrugated roller; The glue roller group applies glue to the corrugated paper peaks after passing through the pressure roller group on the lower corrugated roller. The pressing roller is located on the side of the lower corrugated roller and presses and bonds the face paper to the glued corrugated paper peaks.

2. The preheating device for corrugated paper production according to claim 1, characterized in that, The heating roller assembly includes two parallel heating rollers, the distance between the two heating rollers being adapted to the thickness of the corrugated paper, and the heating rollers are internally heated by electric heating, heat transfer oil heating, or steam heating.

3. The preheating device for corrugated paper production according to claim 1, characterized in that, Both the upper and lower corrugated rollers have cavities inside, and an electromagnetic coil coaxial with the upper or lower corrugated roller is installed inside the cavity.

4. The preheating device for corrugated paper production according to claim 1, characterized in that, The pressure roller assembly includes a fixed shaft parallel to the lower corrugated roller. A roller is coaxially rotatably sleeved on the outer wall of the fixed shaft. A drive source for driving the roller to rotate is provided at the end of the fixed shaft. Multiple roller teeth are evenly arranged on the outer circumference of the roller. The rotational speed of the roller is adapted to the conveying speed of the corrugated paper.

5. The preheating device for corrugated paper production according to claim 4, characterized in that, The roller teeth are hollow cover structures made of rubber. The roller teeth are connected to the roller and their interiors are closed cavities filled with heat-conducting oil.

6. The preheating device for corrugated paper production according to claim 5, characterized in that, A metal top block is provided on the roller inside the cavity of the roller teeth. The shape of the top block is adapted to the roller teeth. The outer wall of the top block is equidistant from the inner wall of the roller teeth. A heating cover is provided on the outer side of the roller away from the lower corrugated roller. An electromagnetic coil is provided on the inner wall of the heating cover.

7. The preheating device for corrugated paper production according to claim 6, characterized in that, The top block has a slider at its bottom, and the roller has a groove that matches the slider. The groove is arranged radially along the roller. The slider slides and the groove are sealed together. The roller and the fixed shaft are equipped with a drive mechanism to drive the slider to slide.

8. The preheating device for corrugated paper production according to claim 7, characterized in that, The driving mechanism includes multiple spherical protrusions evenly spaced at the bottom of the slider. An annular groove is formed on the inner wall of the roller where the protrusions are located. A spherical push block that cooperates with the protrusions is provided on the outer wall of the fixed shaft inside the annular groove. The push block is located on the line connecting the fixed shaft and the axis of the lower corrugated roller.

9. The preheating device for corrugated paper production according to claim 1, characterized in that, The glue roller assembly includes a glue tank, in which a glue-applying roller parallel to the lower corrugated roller is rotatably arranged. The glue-applying roller rotates in the opposite direction to the lower corrugated roller. The lower circumferential outer wall of the glue-applying roller is in contact with the glue in the glue tank. A heating element for maintaining the temperature of the glue is correspondingly provided in the glue tank.

10. The preheating device for corrugated paper production according to claim 9, characterized in that, The glue tank is equipped with a control roller that is parallel to the glue coating roller. The glue coating roller and the control roller rotate in the same direction. The distance between the glue coating roller and the control roller is adapted to the thickness of the glue on the glue coating roller.

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