Paperboard dehumidification structure of face paper upward type double-faced machine and paperboard forming process thereof

Abstract

The present application relates to a kind of paperboard dehumidification structure of face paper upward type double-sided machine and its paperboard forming process, its structure includes the paperboard dehumidification conveying part with paperboard conveying surface, the bottom of the paperboard conveying surface is equipped with negative pressure exhaust dehumidification device.The bottom of the paperboard conveying surface of the present application has negative pressure, when the back of corrugated paperboard passes on the paperboard conveying surface, the moisture in the corrugated paperboard can be absorbed from the self aperture of the back paper of corrugated paperboard using negative pressure, to achieve the purpose of effective dehumidification.

Description

TECHNICAL FIELD

[0001] The present application relates to a paperboard production equipment, in particular to a paperboard dehumidification structure of a face paper upward double facer and a paperboard forming process thereof. BACKGROUND

[0002] The function of the double facer in the paperboard production equipment is to adhere the face paper and the flute paper to form the corrugated paperboard, wherein, in order to improve the production capacity and quality of the corrugated paperboard, the face paper is preferably pre-printed paper with a printing layer on the surface, and the requirement of the corrugated paperboard product is that the surface of the printing layer is not scratched and has no indentation, the pre-printed paper is reliably bonded with the flute paper, the paperboard is flat and not soft. However, according to the current paperboard process, the above problems cannot be overcome at the same time, for example, when the pre-printed paper is processed in the double facer in the upward manner, the surface of the pre-printed paper has ink, film and the like, which hinders the air permeability, so that the water vapor generated in the pulp drying process inside the corrugated paperboard is difficult to discharge, and the paperboard is not flat or soft. At present, the main way to solve this problem is to blow or suck air to the side of the paperboard and towards the flute direction to absorb the moisture, but since the paper surface is wide, such as 2.8 meters wide, and the flute height is only a few millimeters, the moisture inside the paperboard is more difficult to discharge the farther away from the edge position, resulting in that the final paperboard is not flat (such as the phenomenon that the four corners of the paperboard are upwardly raised). SUMMARY

[0003] The purpose of the present application is to provide a paperboard dehumidification structure of a face paper upward double facer and a paperboard forming process thereof, which has a simple and reasonable structure, performs negative pressure dehumidification on the back of the paperboard, and has a simple, efficient and reliable dehumidification method.

[0004] The purpose of the present application is achieved in the following manner:

[0005] A paperboard dehumidification structure of a face paper upward double facer, comprising a paperboard dehumidification conveying part provided with a paperboard conveying surface, characterized in that: a negative pressure suction dehumidification device is arranged at the bottom of the paperboard conveying surface.

[0006] The purpose of the present application can also be solved by the following technical measures:

[0007] As a more specific scheme, the paperboard dehumidification conveying part comprises a rack and a conveying belt, the conveying belt is arranged on the rack, and the conveying belt is provided with air permeable holes penetrating through the surface thereof; the negative pressure suction dehumidification device is arranged on the inner side of the conveying belt and opposite to the air permeable holes; and the upper surface of the conveying belt forms the paperboard conveying surface.

[0008] As a further scheme, the negative pressure suction dehumidification device comprises a negative pressure moisture absorption box, the negative pressure moisture absorption box is in communication with the air suction port of the suction fan, and the top surface of the negative pressure moisture absorption box is provided with a plurality of air suction holes corresponding to the paperboard conveying surface.

[0009] As a further scheme, the negative pressure moisture absorption boxes are provided in plurality, and each negative pressure moisture absorption box is arranged along the conveying direction of the paperboard conveying surface.

[0010] As a further scheme, a wind collecting box is further included, and the wind collecting box is provided with a pressure distribution pipe corresponding to each negative pressure moisture absorption box, the pressure distribution pipe is in communication with the corresponding negative pressure moisture absorption box and the wind collecting box respectively, and the wind collecting box is in communication with the air suction port of the air extractor through an air suction pipe.

[0011] As a further scheme, the outer surface of the conveying belt is an anti-skid surface, which is easier to form a static friction cooperation with the back surface of the corrugated paperboard, so that the two are synchronized.

[0012] As a further scheme, the power roller and the tensioning roller are arranged on the frame, the conveying belt is arranged outside the power roller and the tensioning roller and is in transmission cooperation with the power roller, and the inner surface of the conveying belt is in sliding cooperation with the negative pressure air extraction and dehumidification device.

[0013] As a further scheme, the face paper upward double-sided machine further includes a paperboard heating conveying part and a paperboard air-permeable heating part, and the paperboard heating conveying part, the paperboard air-permeable heating part and the paperboard dehumidification conveying part are arranged in sequence along the paperboard conveying direction. The paperboard heating conveying part can not only generate conveying power, but also can press the corrugated paperboard and heat the single side or the double sides; the paperboard air-permeable heating part can heat the single side or the double sides between the corrugated paperboards or not, and the upper part of the paperboard air-permeable heating part has an air-permeable gap, which is beneficial to the air permeation of the passing corrugated paperboard.

[0014] A paperboard forming process of a face paper upward double-sided machine, which comprises a dehumidification step, and the dehumidification step is performed in the double-sided machine, and the moisture in the paperboard is absorbed through the pores of the paper on the back surface of the paperboard by adopting the negative pressure air suction on the back surface of the face paper upward paperboard.

[0015] As a further scheme, the face paper upward paperboard is subjected to double-sided heating and upper air-permeable heating in sequence before the dehumidification step.

[0016] The beneficial effects of the present application are as follows:

[0017] (1) The paperboard conveying surface bottom has a negative pressure, when the back surface of the corrugated paperboard passes on the paperboard conveying surface, the moisture in the corrugated paperboard can be absorbed from the pores of the paper on the back surface of the corrugated paperboard by the negative pressure, so that the effective dehumidification is achieved.

[0018] (2) The air suction hole is located at the bottom of the paperboard conveying surface, and can be close to the center position of the corrugated paperboard, so that the moisture in each part of the corrugated paperboard has the opportunity to approach the air suction hole and be efficiently absorbed.

[0019] (3) The negative pressure exhaust dehumidification device of the present invention is provided with a conveyor belt with ventilation holes between it and the cardboard conveying surface. The corrugated cardboard can be attached to the surface of the conveyor belt by negative pressure and move synchronously with the transmission belt. Therefore, there is no other conveying structure above the face paper of the corrugated cardboard, which provides better protection for the face paper and saves more equipment costs.

[0020] (4) The present invention takes into account that the back of corrugated cardboard generally does not have ink, waterproof film or other treatments that block the air permeability of the paper. It adopts the back air extraction method to dehumidify, so that moisture can be extracted from all parts of the corrugated cardboard, thereby improving the flatness of the cardboard. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of the cardboard dehumidification conveying unit in the present invention.

[0022] Figure 2 for Figure 1 Enlarged structural diagram at point B.

[0023] Figure 3 This is a cross-sectional view of the cardboard dehumidification conveying section in this invention.

[0024] Figure 4 for Figure 3 Enlarged structural diagram at point C.

[0025] Figure 5 for Figure 1 A schematic diagram of the structure after part of the middle frame has been removed.

[0026] Figure 6 This is a schematic diagram of the double-sided machine with the face paper facing upward in this invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] See Figures 1 to 5 As shown, a paperboard dehumidification structure for a double-sided machine with the face paper facing upward includes a paperboard dehumidification conveying section 10 with a paperboard conveying surface A, and a negative pressure exhaust dehumidification device is provided at the bottom of the paperboard conveying surface A.

[0029] The cardboard dehumidification conveying unit 10 includes a frame 3 and a conveyor belt 2. The conveyor belt 2 is mounted on the frame 3, and the surface of the conveyor belt 2 is provided with ventilation holes 21 penetrating its surface. The negative pressure exhaust dehumidification device is located inside the conveyor belt 2 and is opposite to the ventilation holes 21. The upper surface of the conveyor belt 2 forms the cardboard conveying surface A.

[0030] The negative pressure exhaust dehumidification device includes a negative pressure moisture absorption box 5, which is connected to the air intake of the exhaust fan 6. The top surface of the negative pressure moisture absorption box 5 is provided with a plurality of air intake holes 51 corresponding to the cardboard conveying surface A.

[0031] The negative pressure moisture absorption boxes 5 are arranged in the conveying direction of the paperboard conveying surface A.

[0032] The air collecting box 7 is provided with a pressure distribution pipe 71 corresponding to each negative pressure moisture absorption box 5, the pressure distribution pipe 71 is in communication with the corresponding negative pressure moisture absorption box 5 and the air collecting box 7 respectively, and the air collecting box 7 is in communication with the air suction port of the air extractor 6 through the air suction pipe 61.

[0033] The outer surface of the conveying belt 2 is an anti-skid surface. The anti-skid surface is a silica gel surface or a rubber surface. The inner surface of the conveying belt 2 is a wear-resistant low-resistance surface. The wear-resistant low-resistance surface is a nylon belt surface or a canvas belt surface.

[0034] The air vent hole 21 is circular. The air vent holes 21 of the conveying belt 2 are arranged in a rectangular array.

[0035] The power roller 1 and the tensioning roller 4 are arranged on the frame 3, the conveying belt 2 is arranged outside the power roller 1 and the tensioning roller 4 and is in driving cooperation with the power roller 1, and the inner surface of the conveying belt 2 is in sliding cooperation with the negative pressure air extraction and dehumidification device.

[0036] In combination with Figure 6 As shown, the face paper upward double-sided machine further comprises a paperboard heating and conveying part 8 and a paperboard air-permeable heating part 9, which are arranged in sequence along the paperboard conveying direction.

[0037] A paperboard forming process of a face paper upward double-sided machine, comprising a dehumidification step, in which the face paper upward paperboard is subjected to negative pressure air suction on the back surface, so that the moisture in the paperboard is absorbed through the pores of the back paper of the paperboard. Before the dehumidification step, the face paper upward paperboard is subjected to double-sided heating and upper air-permeable heating in sequence.

[0038] The working principle is: in combination with Figure 6As shown, when the top paper (which can be pre-printed paper) and the bottom paper coated with paste enter the paperboard heating and conveying part 8 at the same time, the upper and lower surfaces of the paperboard heating and conveying part 8 heat the top paper and the bottom paper respectively, at the same time, the conveying belt on the upper side of the paperboard heating and conveying part 8 presses the top paper in the direction of the top paper, thereby accelerating the adhesion of the top paper and the bottom paper, forming a corrugated paperboard; further, the corrugated paperboard enters the paperboard air-permeable heating part 9, the bottom of the paperboard air-permeable heating part 9 is provided with a hot plate to heat the bottom surface of the corrugated paperboard, the upper part of the paperboard air-permeable heating part 9 is provided with a heating roller group to heat the top surface of the corrugated paperboard, and since the heating rollers of the heating roller group have gaps between them, the upper part of the corrugated paperboard is air-permeable. Finally, the corrugated paperboard enters the paperboard conveying surface A of the paperboard dehumidifying and conveying part 10, the bottom surface of the corrugated paperboard covers the air-permeable holes 21 of the conveying belt 2, when the air-permeable holes 21 pass above the air suction holes 51 of the negative pressure dehumidifying box 5, the corrugated paperboard is in static friction cooperation with the outer surface of the conveying belt 2 under the action of negative pressure and anti-skid surface, driven by the conveying belt to be conveyed synchronously, at the same time, especially crucially, the negative pressure of the negative pressure dehumidifying box 5 can make the moisture in the corrugated paperboard pass through the pores of the back paper of the corrugated paperboard and be sucked away, achieving good dehumidifying and drying effect, making the corrugated paperboard more flat.

Claims

1. A paperboard dehumidification structure of a face paper upward type double facer, comprising a paperboard dehumidification conveying section (10) provided with a paperboard conveying surface (A), characterized in that: The bottom of the paperboard conveying surface (A) is provided with a negative pressure exhaust dehumidification device; The paperboard dehumidification conveying part (10) comprises a rack (3) and a conveying belt (2), the conveying belt (2) is arranged on the rack (3), and the surface of the conveying belt (2) is provided with air permeable holes (21) penetrating through the surface; the negative pressure exhaust dehumidification device is arranged on the inner side of the conveying belt (2) and opposite to the air permeable holes (21); and the upper surface of the conveying belt (2) forms the paperboard conveying surface (A). The outer surface of the conveying belt (2) is an anti-skid surface. The face-up double-sided machine further comprises a paperboard heating conveying part (8) and a paperboard air-permeable heating part (9), and the paperboard heating conveying part (8), the paperboard air-permeable heating part (9) and the paperboard dehumidification conveying part (10) are arranged in sequence along the paperboard conveying direction. The bottom of the paperboard air-permeable heating part (9) is provided with a hot plate for heating the bottom surface of the corrugated paperboard, and the upper part of the paperboard air-permeable heating part (9) is provided with a heating roller set for heating the top surface of the corrugated paperboard, and since the heating rollers of the heating roller set have gaps between the heating rollers, the upper part of the corrugated paperboard is beneficial to air permeation. The negative pressure exhaust dehumidification device comprises a negative pressure moisture absorption box (5), the negative pressure moisture absorption box (5) is in communication with the air suction port of the exhaust fan (6), and the top surface of the negative pressure moisture absorption box (5) is provided with a plurality of air suction holes (51) corresponding to the paperboard conveying surface (A). A plurality of negative pressure moisture absorption boxes (5) are arranged along the conveying direction of the paperboard conveying surface (A). The rack (3) is provided with a power roller (1) and a tensioning roller (4), the conveying belt (2) is arranged outside the power roller (1) and the tensioning roller (4) and is in transmission cooperation with the power roller (1); and the inner surface of the conveying belt (2) is in sliding cooperation with the negative pressure exhaust dehumidification device.

2. The paperboard dehumidifying structure of the top sheet type double-faced machine according to claim 1, characterized by: The negative pressure moisture absorption box (5) is provided with a plurality of, each negative pressure moisture absorption box (5) along the conveying direction of the paperboard conveying surface (A) arrangement; 3. A paperboard forming process for a top sheet double facer according to claim 1, characterized by: The dehumidification step is performed in the double-sided machine, and the moisture in the paperboard is absorbed through the pores of the back paper of the paperboard by adopting negative pressure air suction on the back of the face-up paperboard; Before the dehumidification step, the face-up paperboard is subjected to double-sided heating and upper air-permeable heating in sequence.

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