A paper guiding sizing method

Abstract

The present invention discloses a paper-leading sizing method, which relates to the technical field of papermaking, and aims to solve the problem that paper is easily broken during the sizing process of paper in the prior art. The paper-leading sizing method comprises controlling a paper-leading water needle to cut the paper web to be sizing, and obtaining a paper strip with a width of 30 cm to 40 cm, and controlling a paper-leading rope to pull the cut paper strip through a sizing machine and then enter a subsequent pulping machine. When it is monitored that the cut paper strip begins to enter the pulping machine, the upper sizing roller and the lower sizing roller of the sizing machine are closed, and sizing agent is provided to the upper sizing roller and the lower sizing roller, and the cut paper strip is sizing, and the sizing paper strip after sizing is expanded to the full width. The paper-leading sizing method provided by the present invention is used to reduce the probability of paper breaking during the paper-leading sizing process and improve production capacity.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, in particular to a paper guiding and sizing method. Background Art

[0002] Sizing is a process in papermaking. Sizing agents can be used to make paper water-resistant. Sizing machines generally have two rollers. During sizing, the sizing agent can be transferred from a metering rod to the rollers. The paper sheet passes through the nip of the two rollers, and the sizing agent on the rollers is transferred to the paper sheet, thereby improving the strength of the paper.

[0003] At present, it is necessary to apply glue to the paper before it is led to the calender, and the paper needs to be guided before gluing. In the prior art, before gluing, the paper strip must first be hit to the middle position of the sizing machine and widened to a width of about 1m, then the upper and lower roller gluing beams are closed, and then the upper and lower gluing rollers are closed, and finally the width of the paper strip is widened to the full width. However, due to the width of the paper strip, when the gluing rollers are closed, the glue acts on the paper strip, causing the temperature and humidity of the paper strip to change dramatically, and the instantaneous tension is reduced, which has a great impact on the tension of the paper strip and is very likely to cause paper breaks. If repeated paper breaks occur during this process, the water needle for guiding the paper before gluing needs to be re-impressed to the position of guiding the paper strip, which greatly wastes time and reduces production capacity. Summary of the invention

[0004] The object of the present invention is to provide a paper feeding and sizing method, which reduces the probability of paper breaking during the paper feeding and sizing process, thereby saving papermaking time and improving production capacity.

[0005] The present invention provides a paper feeding and sizing method, which is applied to a papermaking system, wherein the papermaking system at least comprises a paper feeding water needle, a paper feeding rope, a sizing machine, a pulping machine, a monitoring system and a control system, wherein the paper feeding water needle, the paper feeding rope, the pulping machine and the sizing machine are electrically connected to the monitoring system and the control system respectively, and the method comprises:

[0006] Controlling the paper-feeding water needle to cut the paper web to be glued to obtain a paper strip with a width of 30 cm to 40 cm;

[0007] Controlling the paper guide rope to pull the cut paper strips through the sizer and then into the subsequent pulper;

[0008] When it is detected that the cut paper strips begin to enter the pulper, the upper and lower sizing rollers of the sizing machine are closed, and sizing agent is provided to the upper and lower sizing rollers to apply sizing to the cut paper strips;

[0009] Expand the sized paper strip to full width.

[0010] Compared with the prior art, the paper sizing method provided by the present invention has the following advantages:

[0011] In the paper-guiding and sizing method provided by the embodiment of the present invention, first, since the paper-guiding water needle and the paper-guiding rope are electrically connected to the controller, the controller can be used to control the paper-guiding water needle to cut the paper web to be glued to obtain a paper strip with a width of 30 cm to 40 cm, and then the controller is used to control the paper-guiding rope to pull the cut paper strip through the glue machine and enter the subsequent pulper. At this time, since the pulper is electrically connected to the monitoring system, the monitoring system can be used to monitor whether there is already a paper strip falling into the pulper. When it is monitored that the cut paper strip begins to enter the pulper, it means that the paper strip is already in a state of tension. At this time, the upper glue roller and the lower glue roller of the glue machine are closed, and the glue agent is provided to the upper glue roller and the lower glue roller, so that the cut paper strip can be glued. Finally, the glued paper strip is expanded to the full width, so that the glued paper strip is expanded to the full width. It can be seen that the paper-leading sizing method of the embodiment of the present invention is to first cut the paper into paper strips with a width of 30 cm to 40 cm, and then, when it is detected that the paper strip is in a state of tension, use the upper sizing roller and the lower sizing roller of the sizing machine to apply sizing to the paper strip. After the sizing roller is closed, part of the sizing agent begins to be applied to the paper strip, so that the temperature and humidity of the paper strip increase instantly, and the tension decreases. Therefore, at this time, the width of the paper strip is about 30-40CM, and the tension of the paper strip is small, thereby reducing the probability of paper breaking, thereby avoiding the need to inject the paper-leading water needle to the paper strip position again due to repeated paper breaks, saving papermaking time and improving production capacity.

[0012] It can be seen from the above that the paper threading and sizing method provided by the embodiment of the present invention can reduce the probability of paper breaking during the paper threading and sizing process, thereby saving papermaking time and improving production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 It is a schematic flow chart of a paper threading and sizing method according to an embodiment of the present invention;

[0015] Figure 2 A schematic diagram of a paper threading process according to an embodiment of the present invention;

[0016] Figure 3 The figure is a schematic flow chart of the gluing process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0019] Sizing is a process in papermaking. Sizing agents can be used to size paper to make the paper water-resistant. According to different sizing principles, it can be divided into internal sizing and surface sizing. Surface sizing is to apply the sizing agent to the base paper when the base paper is dried. The sizing machine generally has two rollers. When sizing, the sizing agent can be transferred to the rollers by a metering rod. The paper web passes through the nip of the two rollers, and the sizing agent on the rollers is transferred to the paper web, thereby improving the strength of the paper.

[0020] At present, before leading the paper to the calender, the paper needs to be sized, and before sizing, the paper needs to be led. In the prior art, before sizing, first, the paper strip is sent to the middle position of the sizing machine and widened to about 1 m in width, then the upper and lower roller sizing beams are closed, then the upper and lower sizing rollers are closed, and finally the width of the paper strip is widened to the full width. However, due to the width of the paper strip, when the sizing rollers are closed, the sizing material acts on the paper strip, causing the temperature and humidity of the paper strip to change violently, and the instantaneous tension decreases, which has a great impact on the tension of the paper strip and is extremely likely to cause paper breakage.

[0021] If paper breakage occurs repeatedly during the above process, it is necessary to reposition the water needle for leading the paper before sizing to the position of the paper strip. This process takes at least 1 minute. For a high-speed paper machine with a production capacity of about 1 ton per minute, each time this process is repeated, the production capacity is reduced by about 1 ton. Calculated according to 400 times of paper breakage per year and 2 times of leading the paper each time, 400×2 = 800 tons, and the annual production capacity is reduced by 800 tons; and after the paper strip is sent to the middle position and widened to about 1 m, then the upper and lower roller sizing beams and the upper and lower sizing rollers are closed. Due to the width of the paper strip, when the sizing rollers are closed, the tension of the paper strip is greatly affected, and it is extremely likely to cause repeated paper breakage of the sizing machine. If the sizing machine breaks paper repeatedly once during each paper leading, and each time the sizing machine breaks paper repeatedly is calculated according to 5 minutes, the production capacity is reduced by 5 tons per minute. For 400 times of paper breakage per year, 400×5 = 2000 tons, and the production capacity is reduced by 2000 tons. In total, the production capacity is reduced by about 2800 tons. Calculated according to the evaluation sales price of 6000 yuan per ton of paper, the sales volume is reduced by about 16.8 million yuan.

[0022] In view of the above problems, an embodiment of the present invention provides a method for sizing during paper leading, so as to solve the problem of easy paper breakage during the sizing of paper in the prior art. The probability of paper breakage during paper leading and sizing is reduced, thereby saving papermaking time and improving production capacity. It should be understood that this method for sizing during paper leading can be applied to a papermaking system.

[0023] An embodiment of the present invention provides a papermaking system, which at least includes a leading water jet, a leading rope, a sizing machine, a pulper, a monitoring system and a control system. The leading water jet, the leading rope, the sizing machine and the pulper are respectively electrically connected to the monitoring system and the control system. It should be understood that this papermaking system can be a high-speed cultural paper machine system, and can be a high-speed cultural paper machine already sold on the market. The monitoring system is used to monitor the position of the leading water jet, the traction state of the leading rope, the working state of the sizing machine, and whether the pulper is in a working state. Among them, the working state of the sizing machine includes whether the upper roll sizing beam and the lower roll sizing beam of the sizing machine are closed, whether the upper sizing roll and the lower sizing roll of the sizing machine are closed, and whether the sizing machine is in a feeding state. The control system is used to control the change of the position of the leading water jet, the change of the traction state of the leading rope, and the change of the working state of the sizing machine.

[0024] It can be understood that the above-mentioned leading water jet is a high-pressure clean water nozzle device that can move along the cross direction of the wire section of the paper machine and can cut the paper web according to actual needs. The above-mentioned leading rope mainly includes a leading rope, a leading rope wheel and a transmission device, and its main function is to lead the paper and transfer the paper strip to the next working area.

[0025] In practical applications, the control system of an embodiment of the present invention includes a control panel, and the control panel at least has a "leading water jet to leading position" button, a "leading start" button, a "post-drying leading program start" button, a "close upper and lower roll sizing beams" button and a "expand full width" button.

[0026] An embodiment of the present invention provides a method for sizing during paper leading, Figure 1 shows a schematic flow chart of the method for sizing during paper leading according to an embodiment of the present invention. As Figure 1 shown, the method for sizing during paper leading according to an embodiment of the present invention includes:

[0027] Step 101: Control the leading water jet to cut the paper web to be sized to obtain a paper strip with a width of 30 cm to 40 cm.

[0028] Exemplarily, the "leading start" button on the above control panel can be pressed. At this time, the leading water jet pump starts, drives the leading water jet to start working, cuts the paper web to be sized, and obtains a paper strip with a width of 30 cm to 40 cm.

[0029] Step 102: Control the leading paper rope to draw the cut paper strip through the sizing machine and then into the subsequent pulper. It should be understood that the above-mentioned leading paper rope at least penetrates the sizing machine, and the above-mentioned pulper is arranged behind the sizing machine, and is used to complete the process of pulping after sizing. The sized paper can enter the pulper under the traction of the leading paper rope.

[0030] Exemplarily, after cutting the paper web to be sized by the above-mentioned leading paper water needle, the control system can be used to control the leading paper rope to introduce the cut paper strip between the upper sizing roller and the lower sizing roller of the sizing machine and pass through the upper sizing roller and the lower sizing roller of the sizing machine, and the paper strip coming out of the sizing machine can enter the subsequent pulper for pulping.

[0031] For example: When the cut paper strip entering the sizing machine reaches the pulper under the traction of the leading paper rope, the leading paper rope can stretch the paper in the whole process into a state with tension, so as to avoid the paper from falling.

[0032] Step 103: When it is monitored that the cut paper strip starts to enter the pulper, close the upper sizing roller and the lower sizing roller of the sizing machine, supply sizing agent to the upper sizing roller and the lower sizing roller, and size the cut paper strip.

[0033] Exemplarily, use the detection system to monitor whether there is a paper strip falling into the pulper. If it is monitored that the cut paper strip starts to enter the pulper behind the sizing machine, at this time, it means that the paper in the whole process is in a state with tension, then the upper sizing roller and the lower sizing roller of the sizing machine can be closed, and sizing agent can be supplied to the upper sizing roller and the lower sizing roller, so as to continuously size the cut paper strip entering the sizing machine.

[0034] Step 104: Expand the sized paper strip to the full width.

[0035] Exemplarily, after sizing the cut paper strip, the "expand to full width" button on the control panel can be pressed to start the expand to full width program, so as to expand the paper strip to the full width.

[0036] As can be seen from the above, in the paper-guiding and sizing method provided by the embodiment of the present invention, first, since the paper-guiding water needle and the paper-guiding rope are electrically connected to the controller, the controller can be used to control the paper-guiding water needle to cut the paper web to be glued to obtain a paper strip with a width of 30 cm to 40 cm, and then the controller is used to control the paper-guiding rope to pull the cut paper strip through the glue machine and enter the subsequent pulper. At this time, since the pulper is electrically connected to the monitoring system, the monitoring system can be used to monitor whether there is already a paper strip falling into the pulper. When it is monitored that the cut paper strip begins to enter the pulper, it means that the paper strip is already in a state of tension. At this time, the upper glue roller and the lower glue roller of the glue machine are closed, and the glue agent is provided to the upper glue roller and the lower glue roller, so that the cut paper strip can be glued. Finally, the full-width expansion operation is performed on the glued paper strip, so that the glued paper strip is expanded to the full width. It can be seen that the paper-leading sizing method of the embodiment of the present invention is to first cut the paper into paper strips with a width of 30 cm to 40 cm, and then, when it is detected that the paper strip is in a state of tension, use the upper sizing roller and the lower sizing roller of the sizing machine to apply sizing to the paper strip. After the sizing roller is closed, part of the sizing agent begins to be applied to the paper strip, so that the temperature and humidity of the paper strip increase instantly, and the tension decreases. Therefore, at this time, the width of the paper strip is about 30-40CM, and the tension of the paper strip is small, thereby reducing the probability of paper breaking, thereby avoiding the need to inject the paper-leading water needle to the paper strip position again due to repeated paper breaks, saving papermaking time and improving production capacity.

[0037] In one practicable manner, the papermaking system of the embodiment of the present invention further comprises a drying cylinder and a calender, wherein the drying cylinder is arranged behind the sizer, the calender is arranged behind the drying cylinder, and the drying cylinder has multiple sets of paper feeding air blowing plates. It should be understood that the number of drying cylinders can be multiple. Figure 2 FIG. 4 is a flow chart showing a paper threading process according to an embodiment of the present invention. Figure 2 As shown, the embodiment of the present invention controls the paper guide rope to pull the cut paper strips to pass through the sizer and then enter the subsequent pulper, and also includes:

[0038] Step 201: Control the paper guide rope to pull the cut paper strip to pass between the upper glue roller and the lower glue roller of the glue machine.

[0039] Exemplarily, after the paper web to be glued is cut into paper strips by the paper-drawing water needle, the paper-drawing is started. At this time, the control system can control the paper-drawing rope to pull the cut paper strips to pass between the upper glue roller and the lower glue roller of the glue machine.

[0040] Step 202: Using the paper drawing rope to draw the paper strip passing between the upper glue roller and the lower glue roller onto the drying cylinder. It should be understood that the drying cylinder can be configured as a drying cylinder with an arc surface, and the drying cylinder also has a post-drying paper drawing part.

[0041] Exemplarily, the thread guide rope guides the paper strip from between the upper sizing roller and the lower sizing roller of the sizing machine to the upper arc surface of the first drying cylinder, and then continues to guide the paper strip from the upper arc surface of the first drying cylinder to the lower arc surface of the second drying cylinder, and then continues to guide the paper strip from the lower arc surface of the second drying cylinder to the upper arc surface of the third drying cylinder, and so on. At this time, multiple drying cylinders can apply a tensile force to the paper strip, so that the paper in the previous thread guide cutting process and sizing process has a certain tension. Since the paper strip is not put into tension control at this time and the tension is controlled by the speed difference of the paper running, increasing the speed difference of the rear drying can make the tension of the paper strip stable.

[0042] Step 203: Control the thread guide water needle to enter the rear drying thread guide part of the drying cylinder. After the thread guide water needle runs 20 cm towards the driving side of the sizing machine, control the cut paper strip to break away from the traction of the thread guide rope. It should be understood that the sizing machine has an operating side and a driving side. Among them, the driving side can be defined as the side where the sizing machine mainly places the transmission device and performs transmission actions. The operating side can be defined as the other side opposite to the driving side of the sizing machine, and the operating side is mainly used for operation and maintenance. Therefore, the control panel can be set on the operating side. The number of thread guide water needles can be two.

[0043] Exemplarily, when the above-mentioned thread guide water needle starts to enter the position of the rear drying thread guide part of the drying cylinder, at this time, the two thread guide water needles run 20 cm towards the driving side of the sizing machine. After the thread guide water needle runs towards the driving side of the rear drying thread guide part of the sizing machine, the control system controls the cut paper strip to break away from the traction of the thread guide rope.

[0044] Step 204: Use multiple groups of thread guide blowing plates contained in the rear drying thread guide part to send the separated paper strip to the pulper.

[0045] Exemplarily, multiple groups of thread guide blowing plates contained in the rear drying thread guide part can be used to send the separated paper strip to the pulper. When the paper strip enters the pulper, the thread guide rope can stretch the paper in the whole process into a state with tension, so as to avoid the paper from falling, and further, the paper strip can be sized in the stretched state of the paper.

[0046] In a feasible manner, Figure 3 The flow chart of the sizing process of the embodiment of the present invention is shown. As Figure 3 shown, when it is monitored in the embodiment of the present invention that the cut paper strip starts to enter the pulper, close the upper sizing roller and the lower sizing roller of the sizing machine, supply sizing agent to the upper sizing roller and the lower sizing roller, and size the cut paper strip, including:

[0047] Step 301: When it is monitored that there is a paper strip falling into the pulper, close the upper roller sizing beam and the lower roller sizing beam of the sizing machine.

[0048] Exemplarily, when the monitoring system detects that paper strips start to fall into the pulper, the "Close the upper and lower roller sizing beams" button can be pressed, so that the upper roller sizing beam of the sizing machine closes and contacts the upper sizing roller, and the lower roller sizing beam of the sizing machine closes and contacts the lower sizing roller, thereby enabling the upper roller sizing beam and the lower roller sizing beam to supply sizing agent to the upper sizing roller and the lower sizing roller.

[0049] Step 302: Supply sizing agent to the upper roller sizing beam and the lower roller sizing beam. After the feeding flow rate of the sizing agent reaches 1100 L / min to 1200 L / min, close the upper sizing roller and the lower sizing roller to size the cut paper strips.

[0050] Exemplarily, supply sizing agent to the above-mentioned upper roller sizing beam and the lower roller sizing beam, and then press the "Close the upper and lower sizing rollers" button to size the paper strips. After the upper sizing roller and the lower sizing roller are closed, part of the sizing material starts to be coated on the paper strips. The temperature and humidity of the paper strips increase instantaneously, and the tension decreases. At this time, the width of the paper strips is about 30 cm to 40 cm, and the tension of the paper strips is small. The impact of the sizing material on the tension of the paper strips is less than that of the paper strips with an original width of about 1 m. The change in the tension of the paper strips is small, reducing the probability of paper breakage.

[0051] In an alternative embodiment, the sizing machine of the present invention further includes an upper sizing roller metering rod and a lower sizing roller metering rod disposed between the upper sizing roller and the lower sizing roller. Before closing the upper sizing roller and the lower sizing roller in the embodiment of the present invention, set the rod pressure of the upper sizing roller metering rod and the lower sizing roller metering rod to 160 kPa to 170 kPa, and set the pressure of the sizing area of the sizing machine to 4 KN / M. The surfaces of the upper sizing roller metering rod and the lower sizing roller metering rod are both rough structures. Therefore, before closing the upper sizing roller and the lower sizing roller, setting the rod pressure to 160 kPa to 170 kPa and setting the pressure of the sizing area of the sizing machine to 4 KN / M can make the sizing agent entering the sizing area slightly smaller, thereby avoiding the problem that the paper temperature is too high instantaneously and the paper is easily broken due to too much sizing agent at the beginning.

[0052] In an alternative embodiment, after the sized paper strips are expanded to the full width, the method further includes: adjusting the pressure of the upper sizing roller metering rod and the lower sizing roller metering rod and the pressure of the sizing area, so that the pressure of the upper sizing roller metering rod and the lower sizing roller metering rod is gradually reduced to 70 kPa to 90 kPa, and the pressure of the sizing area is gradually increased to 14 KN / M to 18 KN / M. Therefore, the sizing amount in the sizing area can be further adjusted by adjusting the pressure of the upper sizing roller metering rod and the lower sizing roller metering rod and the pressure of the sizing area according to actual needs, reducing the probability of paper breakage in the sizing area.

[0053] In an implementable manner, the leading paper water needle of the embodiment of the present invention includes a drive side leading paper water needle and an operator side leading paper water needle, and expanding the sized paper strip to the full width includes: controlling the sizing machine to enter the full-width expansion program, so that the drive side leading paper water needle moves towards the drive side of the sizing machine, and the operator side leading paper water needle moves towards the operator side of the sizing machine, thereby expanding the paper strip to the full width by using the leading paper water needle.

[0054] In an alternative manner, the sizing machine of the embodiment of the present invention further has a tension control system, and the tension control system is used to control the tension of the paper strip during the full-width expansion process, and the tension of the paper strip during the full-width expansion process is 120 KN / M. It should be understood that the tension control system can be arranged on the sizing agent.

[0055] In an implementable manner, before the embodiment of the present invention controls the leading paper water needle to cut the paper to obtain a paper strip with a width of 30 cm to 40 cm, the method further includes: controlling the drive side leading paper water needle and the operator side leading paper water needle to run to the leading paper position.

[0056] Exemplarily, before the leading paper sizing of the embodiment of the present invention, the running speed of the paper can be controlled to be 1600 m / min to 1800 m / min first.

[0057] For the leading paper sizing method provided by the embodiment of the present invention, when leading the paper before sizing, after other conditions are met, first turn on the leading paper water needle, cut the paper strip to a width of about 30 cm to 40 cm, then start the leading paper rope, lead the paper strip to before the first drying cylinder of the after-drying section, and then according to the leading paper program, the water needle position automatically enters the after-drying leading paper position, and the paper strip automatically breaks away from the traction of the leading paper rope. At this time, the after-drying leading paper program is started, and the leading paper blowing plate leads the paper strip to before the calender. The paper strip falls into the pulper. At this time, do not press the "move the paper strip to the middle position" button on the leading paper control panel, but change the program to start closing the upper and lower roller sizing beams. After the feeding flow rate reaches the requirement, start closing the upper and lower sizing rollers. After the sizing rollers are closed, since the width of the paper strip is about 30 cm to 40 cm at this time, the impact of the sizing material on the tension of the paper strip is less than that of a paper strip with an original width of about 1 M, which can reduce the probability of paper breakage. Therefore, after the paper strip is stable, directly press the "expand to full width" button to start the full-width expansion program. At this time, the drive side leading paper water needle moves towards the drive side, and the operator side leading paper water needle moves towards the operator side to expand the paper strip to the full width.

[0058] Embodiment 1

[0059] When leading the paper before sizing on a high-speed coated paper machine, after the running speed reaches 1600 M / min and other conditions are met, perform the following leading paper sizing operations:

[0060] 1. First press the "lead paper water needle to leading paper position" button, and wait for the two leading paper water needles on the operator side and the drive side of the sizing machine to run to the leading paper position.

[0061] 2. Press the "Paper Drawing Start" button to start the paper drawing water needle pump. Set the paper drawing water needle cutting pressure to 300 bar - 600 bar. Start paper drawing. The width of the paper strip cut by the paper drawing water needle is 30 cm - 40 cm.

[0062] 3. Start paper drawing. At this time, the paper drawing rope guides the paper strip in front of the first dryer cylinder of the after-dryer. According to the paper drawing program, the water needle position automatically enters the after-dryer paper drawing position. The two paper drawing water needles respectively run 20 cm towards the drive side of the sizing machine. At this time, the paper strip automatically breaks away from the traction of the paper drawing rope.

[0063] 4. At this time, start the after-dryer paper drawing program, and use each group of paper drawing air blowing plates in the dryer cylinder to guide the paper strip into the pulper.

[0064] 5. At this time, do not press the "Move the Paper Strip to the Middle Position" button on the paper drawing control panel. Instead, start pressing the "Close the Upper and Lower Roll Sizing Beams" button, so that the sizing machine is transported to the upper sizing roll and the lower sizing roll through the upper roll sizing beam and the lower roll sizing beam. Until the feeding flow rate of the sizing agent reaches 1100 L / min - 1200 L / min, set the bar pressure of the upper sizing roll metering rod and the lower sizing roll metering rod to 160 kPa, and set the nip pressure to 4 kN / M. Start pressing the "Close the Upper and Lower Sizing Rolls" button. After the sizing rolls are closed, part of the sizing agent starts to be coated on the paper strip. The temperature and humidity of the paper strip increase instantly, and the tension decreases. Because the width of the paper strip is about 30 - 40 cm at this time, the tension of the paper strip is small, and the impact of the sizing agent on the tension of the paper strip is less than that of the paper strip with an original width of about 1 m. The change in the tension of the paper strip is small, reducing the probability of paper breakage. Because the paper strip is not under tension control at this time and is controlled by speed difference, increasing the after-dryer speed difference can stabilize the tension of the paper strip.

[0065] 6. After the tension of the paper strip is stable, directly press the "Expand to Full Width" button to start the expand-to-full-width program, so that the paper drawing water needle on the drive side of the sizing machine moves towards the drive side, and the paper drawing water needle on the operator side moves towards the operator side, thereby expanding the paper strip to the full width. After the paper strip is expanded to the full width, the automatic tension control will be put into use at 120 kN / M.

[0066] 7. Adjust the pressure of the upper sizing roll metering rod and the lower sizing roll metering rod, so that the pressure is gradually reduced to 70 kPa - 90 kPa, and adjust the sizing nip pressure to be gradually increased to 14 kN / M - 18 kN / M. Adjust the sizing amount to complete the sizing and paper drawing process.

[0067] The above are only specific embodiments of the present invention. Obviously, various modifications and combinations can be made without departing from the spirit and scope of the present invention. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the present invention defined by the appended claims, and are considered to have covered any and all modifications, variations, combinations or equivalents within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the intention of the present invention includes these changes and modifications. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the said claims.

Claims

1. A method for paper guiding and sizing, characterized in that, Applied to a papermaking system, the papermaking system at least comprises a paper guide water needle, a paper guide rope, a sizer, a pulper, a monitoring system and a control system, the paper guide water needle, the paper guide rope, the sizer, and the pulper are electrically connected to the monitoring system and the control system respectively, and the method comprises: Controlling the paper-feeding water needle to cut the paper web to be glued to obtain a paper strip with a width of 30 cm to 40 cm; Controlling the paper guide rope to pull the cut paper strips through the sizer and then into the subsequent pulper; When it is detected that the cut paper strips begin to enter the pulper, the upper and lower sizing rollers of the sizing machine are closed, and sizing agent is provided to the upper and lower sizing rollers to apply sizing to the cut paper strips; Expand the sized paper strip to full width.

2. The paper guiding and sizing method according to claim 1, characterized in that, The papermaking system further comprises a drying cylinder and a calender, wherein the drying cylinder is arranged behind the sizer, the calender is arranged behind the drying cylinder, the drying cylinder has a plurality of paper feeding blowing plates, and the drying cylinder also has a post-drying paper feeding part, and the paper feeding rope is controlled to pull the cut paper strips to pass through the sizer and then enter the subsequent pulper, comprising: Controlling the paper guide rope to pull the cut paper strip to pass between the upper glue roller and the lower glue roller of the glue applicator; Using the paper guide rope to pull the paper strip passing through the upper glue roller and the lower glue roller onto the drying cylinder; Control the paper feed water needle to enter the post-drying paper feed part of the drying cylinder, and after the paper feed water needle runs 20 cm toward the transmission side of the sizer, control the cut paper strip to be separated from the traction of the paper feed rope; The detached paper strips are sent to the pulper by using a plurality of paper drawing blowing plates contained in the post-drying paper drawing section.

3. The sizing method for draw-in sizing according to claim 1, wherein When it is detected that the cut paper strips begin to enter the pulper, the upper and lower sizing rollers of the sizing machine are closed, and sizing agent is provided to the upper and lower sizing rollers to apply sizing to the cut paper strips, including: When it is detected that paper strips begin to fall into the pulper, the upper roller gluing beam and the lower roller gluing beam of the sizing machine are closed; The sizing agent is provided to the upper and lower gluing rollers, and after the feeding flow rate of the sizing agent reaches 1100L / min to 1200L / min, the upper and lower gluing rollers are closed to apply glue to the cut paper strips.

4. The paper guiding sizing method according to claim 3, characterized in that, The glue applicator also includes an upper glue roller metering rod and a lower glue roller metering rod arranged between the upper glue roller and the lower glue roller. Before closing the upper glue roller and the lower glue roller, the rod pressure of the upper glue roller metering rod and the lower glue roller metering rod are set to 160kPa~170kPa, and the pressure of the glue application area of ​​the glue applicator is set to 4kN / m.

5. The paper guiding sizing method according to claim 4, characterized in that, After the glued paper strip is expanded to the full width, the method further comprises: Adjust the pressure of the upper and lower glue roller metering rods and the pressure of the glue application zone so that the pressure of the upper and lower glue roller metering rods is gradually reduced to 70kPa-90kPa, and the pressure of the glue application zone is gradually increased to 14kN / m-18kN / m.

6. The paper guiding sizing method according to claim 1, wherein The draw water jets include a drive side draw water jet and an operator side draw water jet. The process of expanding the sized paper strip to the full width includes: Controlling the sizing machine to enter the full-width expansion program, causing the drive side draw water jet to move towards the drive side of the sizing machine and the operator side draw water jet to move towards the operator side of the sizing machine, so as to expand the paper strip to the full width.

7. The paper guiding sizing method according to claim 6, characterized in that, The sizing machine also has a tension control system, which is used to control the tension of the paper strip during the full-width expansion process. The tension of the paper strip during the full-width expansion process is 120 kN / m.

8. The paper guiding sizing method according to claim 6, characterized in that, Before controlling the draw water jets to cut the paper web to be sized to obtain a paper strip with a width of 30 cm to 40 cm, the method further includes: Controlling the drive side draw water jet and the operator side draw water jet to run to the paper drawing position.

9. The paper guiding sizing method according to claim 7, wherein The process parameters for the draw water jets to cut the paper include: the cutting pressure of the draw water jets is 300 bar to 600 bar.

10. The paper guiding sizing method according to any one of claims 1 to 8, characterized in that, The method further includes: Before paper drawing and sizing, controlling the running speed of the paper to be 1600 m / min to 1800 m / min.

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