Wet paper sheet interlayer spraying device

Abstract

The utility model relates to a wet paper sheet interlayer spraying device, and belongs to the technical field of papermaking. A wet paper sheet interlayer spraying device comprises a spraying pipe, a plurality of spraying branch pipes arranged on the pipe wall of the spraying pipe in the length direction of the spraying pipe and spraying nozzles arranged at the ends of the spraying branch pipes, and further comprises anti-sticking cover bodies covering the spraying branch pipes and the spraying nozzles and used for preventing liquid adhesives from being stacked. According to the utility model, the anti-sticking cover body is arranged at the part easy to scale, so that the problem of paper defects caused by starch blocks is solved; through the multi-layer optimization design of the anti-sticking cover body, such as dip angle setting, length setting, structure setting and flow guide layer setting, the liquid adhesive falling on the anti-sticking cover body is rapidly guided, and accumulation and scaling are avoided; and the problem of starch lump paper defects is further solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of wet paper sheet interlayer spraying devices, belong to papermaking technical field. BACKGROUND

[0002] In the papermaking technical field, the manufacturing process of multi-layer paperboard, taking the machine type of papermaking forming wire as cylinder type as an example, includes the following steps: 1, respectively at a plurality of process positions with respective papermaking forming wire to form respective wet paper sheet;2, the wet paper sheet at the first process position is transported to the next process position using blanket, the wet paper sheet transported in flat state is suspended in the lower surface of the blanket (adsorbed);3, the papermaking forming wire at local position transmits the wet paper sheet flat on its surface to the blanket (adsorbed with wet paper sheet from the previous process position), the included angle between the local wet paper sheet and the wet paper sheet suspended above gradually decreases until disappears (extrusion occurs when the included angle disappears);4, after extrusion by blanket and papermaking forming wire at local position, the precursor of double-layer paperboard is formed;5, repeat the above steps until the precursor of the required layer number paperboard is formed;6, after subsequent processing, the precursor of multi-layer paperboard is made into paperboard.

[0003] In order to enhance the interlayer bonding strength of paperboard, it is usually necessary to provide a spraying device to spray adhesive solution on the opposite surfaces of the two layers of wet paper sheet before extruding them, so as to ultimately improve the interlayer bonding strength of the paperboard. For example, the utility model patent with publication number CN219527190U discloses an interlayer paper spraying starch device, which realizes synchronous spraying of upper and lower layers of paper through structural innovation, thereby improving production efficiency. The core of the technology is that the fixed frame and the conveying belt system are the basic framework, the spraying plate is a hollow U-shaped structure, the upper and lower inner walls are evenly provided with spray heads, and the upper and lower surfaces of the paper can be simultaneously sprayed with starch solution; the starch water tank is located above the spraying plate and stores the starch reinforcing agent; the water pump delivers the starch solution from the water tank to the inside of the spraying plate and uniformly distributes it to each spray head; the flow regulating valve controls the flow of the starch solution to ensure uniform spraying.

[0004] During the spraying of starch adhesive, the adhesive may fall and adhere to the spraying mechanism. When the accumulated starch deposits reach a certain amount, there is a risk of contaminating the wet paper sheet below due to the falling of the starch deposits. The falling of the starch deposits may cause the formation of starch block paper in the formed paperboard, affecting the quality of the paperboard. This is unacceptable for high-quality paperboard. Therefore, improvements need to be made to the existing equipment or process, and a complete solution is proposed to ultimately solve the problem of starch block paper. UTILITY MODEL CONTENTS

[0005] In view of the problems raised in the background art, the utility model provides a wet paper sheet interlayer spraying device. The spraying device of the utility model solves the problem of starch block paper by providing an anti-sticking cover at the part prone to fouling.

[0006] The utility model discloses a technical scheme that solves the above problems as follows:

[0007] A wet paper page interlayer spraying device, comprising a spraying pipe, a plurality of spray branch pipes arranged on the pipe wall of the spraying pipe along the length direction of the spraying pipe, and a spray nozzle arranged at the end of the spray branch pipe, further comprising an anti-sticking cover body covering the spray branch pipe and the spray nozzle to prevent liquid adhesive from accumulating.

[0008] In the above technical scheme of the utility model, the anti-sticking cover body is arranged at the easy-fouling part (the spray branch pipe and the spray nozzle) to play a shielding role and protect the wet paper page below.

[0009] Preferably, the horizontal elevation angle of the spray nozzle is set to 30º-60º.

[0010] The horizontal elevation angle of the spray nozzle is the included angle between the direction of the spray nozzle and the horizontal plane. However, the meaning of the direction is not clear, which can be a virtual concept representing the spray direction, a physical concept representing the direction of the spray nozzle shell, or a physical concept representing the direction of the spray nozzle lip. In addition, the mist sprayed by the spray nozzle lip is not a straight line like a laser, but forms a fan surface or a conical surface covering a certain area. Therefore, the spray direction specifically refers to the axis of symmetry of the fan surface or the conical surface. When the spray nozzle is a standard part, the above three explanations will tend to be unified. When it is a non-standard part, the spray direction is used as the reference, so the impact of the structure of the spray nozzle on it does not need to be considered.

[0011] When the spray nozzle has a horizontal elevation angle, the spray branch pipe usually also has a horizontal elevation angle. The anti-sticking cover body covers the spray nozzle and the spray branch pipe, so the anti-sticking cover body will have an inclination angle. The inclination angle of the anti-sticking cover body has a corresponding relationship with the horizontal elevation angle of the spray nozzle, and the two can be the same or have a small range of difference, such as ±5°. The inclination angle of the anti-sticking cover body does not need to be defined accurately, as long as it can have a flow guiding effect on the liquid adhesive dropped on it to make it difficult to accumulate dirt. After studying the technical problem, the inventor believes that the starch block paper disease problem is caused by the secondary falling of the accumulated dirt, and has no direct relationship with the falling of the liquid adhesive. Therefore, as long as the falling liquid adhesive cannot accumulate dirt, the problem can be solved. The implementation of the above technical scheme of the present application can have a flow guiding effect on the received liquid adhesive, making it difficult for the falling liquid adhesive to accumulate and solving the fouling problem.

[0012] Preferably, the inclination angle of the anti-sticking cover body is set to 30º-60º.

[0013] Preferably, the anti-sticking cover body has a first side plate constituting a first flow guiding surface and a second side plate constituting a second flow guiding surface; the first side plate and the second side plate form a flow guiding boundary line at their connection.

[0014] The technical scheme of the utility model discloses, through the structure optimization of anti -sticking cover, has promoted the flow -guiding effect.

[0015] As the preferred technical scheme of above, the first side plate and the second side plate form the included angle of 30 ° ~ 60 °.

[0016] The technical scheme of the utility model discloses, through the structure optimization of anti -sticking cover, has promoted the flow -guiding effect.

[0017] As the preferred technical scheme of above, at least one of the first side plate and the second side plate is fixedly connected with the spray branch pipe.

[0018] As another preferred technical scheme of above, at least one of the first side plate and the second side plate is fixedly connected with the spray branch pipe.

[0019] As the preferred technical scheme of above, the surface of the first side plate and the second side plate is provided with flow -guiding layer.

[0020] The technical scheme of the utility model discloses, through the structure optimization of anti -sticking cover, has promoted the flow -guiding effect.

[0021] As the preferred technical scheme of above, the flow -guiding layer is wax coating, anti -sticking adhesive tape layer or self -polishing layer.

[0022] The technical scheme of the utility model discloses, when the flow -guiding layer is self -polishing layer, the material of flow -guiding layer is preferably fluorine plastic sheet.

[0023] As the preferred technical scheme of above, the spray branch pipe is the sleeve pipe with telescopic function.

[0024] The technical scheme of the utility model discloses, the length of spray branch pipe can be adjusted, to adapt to the papermaking forming wire of different sizes, adjusts the distance between spray nozzle and papermaking forming wire and papermaking felt, to reach the best spray effect.

[0025] As a preferred solution of the above technical scheme, the spraying device is used for the interlayer spraying step when the wet paper layers are compounded, the paper machine comprises a papermaking felt for conveying a first wet paper layer, a papermaking forming wire arranged below the papermaking felt for forming a second wet paper layer, and a former for spraying paper pulp on the papermaking forming wire to form the second wet paper layer; the spraying device is arranged near the papermaking felt and the papermaking forming wire so that the spraying distance thereof covers the feeding angle; the spraying pipe is located above the former, and the spraying nozzles are directed toward the feeding angle.

[0026] In the above technical scheme of the utility model, the feeding angle is formed in the process that the local cylindrical papermaking forming wire conveys the first wet paper layer to the papermaking felt carrying the wet paper layer conveyed from the previous process position, and specifically, the feeding angle is the included angle between the tangent of the first or second quadrant (with the axis of the cylindrical papermaking forming wire as the origin) of the cylindrical papermaking forming wire and the papermaking felt formed in the process that the local second wet paper layer is compounded with the first wet paper layer on the papermaking felt. Since the tangent is uncertain, the feeding angle has a range rather than a fixed value. The feeding angle has the maximum angle when it is just formed and has the minimum angle when it is closed. The minimum angle tends to zero, and the maximum angle is not definite because the position point at which the local second wet paper layer is ready to start to be compounded with the first wet paper layer on the papermaking felt is not definitely defined. Therefore, the feeding angle is not usually taken as the basis parameter for the debugging of the equipment in practice, even if it exists objectively.

[0027] Since the papermaking felt is usually arranged horizontally, the horizontal elevation angle of the spraying nozzle is usually taken to estimate the feeding angle, and the feeding angle is regarded as a fixed value in the suitable range. The suitable range is defined by the suitable horizontal elevation angle of the spraying nozzle in the suitable position.

[0028] The anti-sticking cover covers the spraying nozzles and the spraying branch pipe; the self structure of the anti-sticking cover comprises two first side plates and second side plates arranged at an angle, and the anti-sticking cover has a certain setting angle. Therefore, when the liquid adhesive falls on the anti-sticking cover, it slides along the inclined surface of the cover and also slides to the two side directions along the inclined surface of the cover, so that the flow direction of the liquid adhesive is three-dimensional, which is related to many factors, such as the flow resistance of the two flow layers, the flow rate, the viscosity coefficient and the viscosity of the liquid adhesive, the included angle of the two side plates, the inclination angle of the anti-sticking cover and the like. Based on the above setting, most of the liquid adhesive falling on the anti-sticking cover is recycled by falling back to the second wet paper layer below along the anti-sticking cover, and a small part of the liquid adhesive flows to the spraying pipe along the anti-sticking cover to form the dirt.

[0029] The above technical scheme of the utility model discloses, through the spray pipe is located in the upper of former, make the dirt on the spray pipe when falling, will not fall to the wet paper, but fall to the former surface, avoid the pollution second wet paper, the special structure design of spray device and the position relation setting of paper machine, can solve the problem that the starch dirt slides to the paper and forms the starch block paper disease.

[0030] As the preferred technical scheme of the above, the horizontal elevation angle of the spray nozzle is 2 / 3 of the liquid adhesive sprayed on the first wet paper and 1 / 3 of the liquid adhesive sprayed on the second wet paper. This ensures that part of the liquid adhesive sprayed on the first wet paper adheres to the first wet paper, and the unadhered part falls on the second wet paper, so that the liquid adhesive is evenly distributed between the wet papers to the maximum extent.

[0031] As the preferred technical scheme of the above, the vertical distance between the spray nozzle and the surface of the papermaking forming wire is 50mm-80mm. Since the liquid adhesive sprayed through the spray nozzle has a certain pressure (generally greater than 0.20Mpa, in mist form), when the distance is less than 50mm, the liquid adhesive is easy to damage the second wet paper, and when the distance is greater than 80mm, the distance is too close to the papermaking felt, which is easy to damage the first wet paper.

[0032] As the preferred technical scheme of the above, the vertical distance between the spray nozzle and the lower surface of the papermaking felt is 50mm-80mm. When the distance is less than 50mm, the liquid adhesive is easy to damage the first wet paper, and when the distance is greater than 80mm, the distance is too close to the surface of the papermaking forming wire, which is easy to damage the second wet paper.

[0033] As the preferred technical scheme of the above, the distance between the flow guide boundary line and the spray branch pipe is 25mm-40mm.

[0034] In the above technical scheme of the utility model, the distance is set so that the anti-sticking cover body does not touch the lower surface of the papermaking felt, avoiding sliding and damaging the first wet paper under the papermaking felt.

[0035] In summary, the utility model has the following beneficial effects:

[0036] 1. The utility model sets an anti-sticking cover body at a part prone to dirt accumulation, and through physical blocking and flow guiding, avoids the accumulation of liquid adhesive on the spray branch pipe and the spray nozzle.

[0037] 2. The utility model has a multi-level structure design of the anti-sticking cover body, such as inclination setting, length setting, structure setting and flow guide layer setting, which quickly guides the liquid adhesive falling thereon and avoids accumulation.

[0038] 3. The utility model sets the spray device above the former, so that the dirt generated on the surface of the former is received by the shell of the former without polluting the wet paper.

[0039] 4、The utility model discloses a multi-dimensional design, completely solve the problem of starch block paper disease. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is the use state schematic drawing of the utility model;

[0041] Figure 2 It is the schematic diagram of spray pipe, spray branch pipe and spray nozzle;

[0042] Figure 3 It is the schematic diagram of spray branch pipe, spray nozzle and anti -adhesion cover body;

[0043] In the drawing, the component name of each sign is as follows:

[0044] 1, spray pipe,

[0045] 2, spray branch pipe,

[0046] 3, spray nozzle,

[0047] 4, anti -adhesion cover body,

[0048] 5, former,

[0049] 6, cylindrical papermaking forming wire,

[0050] 7, papermaking felt,

[0051] 31, horizontal elevation angle,

[0052] 41, first side plate,

[0053] 42, second side plate,

[0054] 43, flow guide boundary line. DETAILED DESCRIPTION

[0055] The utility model is further explained in connection with the drawings.

[0056] The specific embodiment is only the explanation of the utility model, and is not the limitation of the utility model.Any change of the person skilled in the art after reading the specification of the utility model is protected by the patent law as long as in the scope of claims.

[0057] A wet paper sheet interlayer spraying device for interlayer spraying step when wet paper sheet interlayer compound of paper machine, as shown in Figure 1 The paper machine comprises:

[0058] Papermaking blanket 7 is used to transport the wet paper sheet (hereinafter referred to as the first wet paper sheet) from the previous process position to the local position; when the first wet paper sheet is transported to the local position, it is still attached to the papermaking blanket 7 and thus suspended above the cylindrical paper forming wire 6 at the local position.

[0059] A cylindrical paper forming wire 6 is used to form a local wet paper sheet (hereinafter referred to as the second wet paper sheet) and to convey the second wet paper sheet to the first wet paper sheet suspended above;

[0060] Forming device 5 is used to spray pulp onto the cylindrical paper forming wire 6 to form a second wet paper sheet;

[0061] An interlayer spraying device is positioned near the papermaking blanket 7 and the papermaking forming wire 6 so that its spraying distance covers the feeding angle.

[0062] The feeding angle is formed by the local cylindrical paper forming wire during the process of conveying the second wet paper sheet to the paper forming blanket carrying the first wet paper sheet, specifically the angle formed when the second wet paper sheet is combined with the first wet paper sheet.

[0063] The wet paper interlayer spraying device, such as Figures 2-3 As shown, the system includes a spray pipe 1, a plurality of spray branch pipes 2 arranged along the length of the spray pipe on its wall, spray nozzles 3 disposed at the ends of the spray branch pipes 2, and an anti-stick cap 4 covering the spray branch pipes 2 and spray nozzles 3 to prevent the accumulation of liquid adhesive. After covering the spray branch pipes 2 and spray nozzles 3, the anti-stick cap 4 can quickly guide the liquid adhesive dripping onto it away under the action of gravity, preventing it from accumulating and forming scale.

[0064] The feed angle is the angle formed when the second wet paper sheet is combined with the first wet paper sheet. It is also equal to the angle between the tangent of the first or second quadrant of the cylindrical paper forming wire (with the axis of the cylindrical paper forming wire as the origin) and the paper felt. Since the tangent is uncertain, the feed angle has a range rather than a fixed value. The feed angle has its maximum angle when it is first formed and its minimum angle when it is closed. The minimum angle tends towards zero, while the maximum angle is unclear because the position where the second wet paper sheet is about to begin combining with the wet paper sheet on the paper felt is not explicitly defined. Therefore, in practice, the feed angle is not usually used as a basic parameter for equipment debugging, even if it objectively exists. Since the paper felt is usually horizontally set, the feed angle is usually estimated using the horizontal elevation angle of the spray nozzle, treating the feed angle as a constant value within a suitable range. This suitable range is defined by the suitable horizontal elevation angle of the spray nozzle at a suitable position.

[0065] Further, the spray nozzle 3 has a horizontal elevation angle 31 of about 42°, and the vertical distance between the spray nozzle 3 and the lower surface of the papermaking felt 7 is about 60 mm, and the vertical distance between the spray nozzle 3 and the surface of the papermaking forming wire 6 is about 70 mm. The above arrangement makes about 2 / 3 of the liquid adhesive sprayed on the first wet paper sheet and 1 / 3 of the liquid adhesive sprayed on the second wet paper sheet (the liquid adhesive sprayed by the spray nozzle has a certain pressure, generally greater than 0.20 Mpa, in the form of mist, and the liquid adhesive used in the embodiment is a starch solution). To ensure that part of the liquid adhesive sprayed on the first wet paper sheet adheres to the first wet paper sheet, and the unadhered part falls on the second wet paper sheet, so that the liquid adhesive is evenly distributed between the wet paper sheets to the maximum extent.

[0066] Further, the anti-sticking cover body has a first side plate 41 forming a first flow guide surface and a second side plate 42 forming a second flow guide surface, and the first side plate 41 and the second side plate 42 form a flow guide boundary line 43 at the connection therebetween. The first side plate 41 and the second side plate 42 form an included angle of about 60°. In the embodiment, the first side plate 41 and the second side plate 42 are fixedly connected with the spray branch pipe 2. The surfaces of the first side plate 41 and the second side plate 42 are provided with flow guide layers formed by polishing the substrates of the first side plate 41 and the second side plate 42 and then applying wax.

[0067] Therefore, the technical principle of the utility model is as follows:

[0068] 1), the anti-sticking cover body 4 covers the spray branch pipe 2 and the spray nozzle 3;

[0069] 2), the self structure of the anti-sticking cover body 4 comprises two first side plates 41 and second side plates 42 arranged at an angle, and the first side plate 41 and the second side plate 42 are provided with flow guide layers;

[0070] 3), the anti-sticking cover body 4 has an inclination angle.

[0071] In the embodiment, the spray nozzle has a horizontal elevation angle 31 of about 42°, and the spray branch pipe also has a horizontal elevation angle substantially the same as the horizontal elevation angle 31 of the spray nozzle. The anti-sticking cover body 4 covers the spray branch pipe 2 and the spray nozzle 3, and therefore the anti-sticking cover body 4 has an inclination angle. The inclination angle is substantially the same as the horizontal elevation angle 31 of the spray nozzle.

[0072] When the liquid adhesive falls on the anti-sticking cover body 4, it slides down along the inclined surface of the cover body and also slides to the two sides along the inclined surface of the cover body, so that the flow direction of the liquid adhesive is three-dimensional, which is related to many factors, such as the flow resistance of the two flow guide layers, the flow rate, the viscosity and the viscosity coefficient of the liquid adhesive, the included angle of the two side plates, the inclination angle of the anti-sticking cover body, etc.

[0073] Based on the above setting, the liquid adhesive falling on the anti-sticking cover 4, most of which falls back to the second wet paper sheet below along the anti-sticking cover 4, is reused, and a small part of which flows to the spray pipe 1 along the anti-sticking cover 4, produces dirt. Since the spray pipe 1 is arranged above the former 5, the dirt on the spray pipe 1 does not fall to the wet paper sheet when falling, but falls to the surface of the former 5, avoiding the pollution of the second wet paper sheet. Therefore, during the production process, no special management of the equipment is required, and only the surface below the former 5 needs to be cleaned during regular maintenance.

[0074] In summary, the special structure design of the spraying device and the position relationship with the paper machine can solve the problem of starch dirt sliding to the paper surface to form starch block paper defects.

Claims

1. A wet paper sheet interlayer spraying device comprising a spraying pipe (1), a plurality of spray branch pipes (2) arranged on the pipe wall along the length direction of the spraying pipe, and a spray nozzle (3) arranged at the end of the spray branch pipe (2), characterized in that: The anti-sticking cover (4) is further provided to cover the spray branch pipe (2) and the spray nozzle (3) to prevent liquid adhesive from accumulating.

2. A wet paper sheet interlayer spraying device according to claim 1, characterized in that: The horizontal elevation angle (31) of the spray nozzle (3) is set to 30º~60º.

3. A wet paper sheet interlayer spraying device according to claim 1, characterized in that: The inclination angle of the anti-sticking cover is set to 30º~60º.

4. A wet paper sheet interlayer spraying device according to claim 1, characterized in that: The anti-sticking cover has a first side plate (41) constituting a first flow guide surface and a second side plate (42) constituting a second flow guide surface; the first side plate (41) and the second side plate (42) form a flow guide boundary line (43) at their connection.

5. A wet paper sheet interlayer spraying device according to claim 4, characterized in that: The first side plate and the second side plate form an included angle of 30º~60º.

6. A wet paper sheet interlayer spraying device according to claim 4, characterized in that: At least one of the first side plate (41) and the second side plate (42) is fixedly connected with the spray branch pipe (2).

7. A wet paper sheet interlayer spraying device according to claim 4, characterized in that: At least one of the first side plate (41) and the second side plate (42) is fixedly connected with the spray branch pipe (2) by magnetic attraction.

8. A wet paper sheet interlayer spraying device according to claim 4, characterized in that: The surface of the first side plate (41) and the second side plate (42) is provided with a flow guide layer.

9. A wet paper sheet interlayer spraying device according to claim 8, characterized in that: The flow guide layer is a wax coating layer, an anti-sticking adhesive tape layer or a self-polishing layer.

10. A wet paper sheet interlayer spraying device according to claim 1, characterized in that: The spray branch pipe (2) is a telescopic sleeve pipe.

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