JP6081143B2 - Single facer and cardboard sheet manufacturing apparatus and method - Google Patents

Description

  The present invention provides a single facer for producing a single-sided cardboard sheet by laminating a liner on a corrugated core, and a corrugated sheet for producing a double-sided corrugated sheet by laminating a liner on both sides of a corrugated core. The present invention relates to an apparatus and a method.

  A corrugating machine as a corrugated board manufacturing apparatus includes a single facer that forms a single-sided cardboard sheet and a double facer that forms a double-sided cardboard sheet by laminating a front liner paper on the single-sided cardboard sheet. The single facer processes a core paper (center core) supplied from a mill roll stand into a corrugated shape and bonds a back liner supplied from another mill roll stand to form a single-sided cardboard sheet. The single-sided corrugated board sheet formed by this single facer is sent to a bridge provided on the downstream side, and is sent to the downstream double facer according to its speed while being stored here. The double facer forms a double-sided cardboard sheet by laminating a single-sided cardboard sheet sent from a bridge with a front liner sent from a separately provided mill roll stand. The double-sided corrugated cardboard sheet that has passed through the double facer is cut in the width direction by a cut-off device after a predetermined slit or ruled line is made in the transport direction by a slitter scorer, and is stacked on a stacker and sequentially discharged. The

  In this case, in the single facer, the back liner is transferred to the nip portion between the pressure belt and the upper roll, while the core paper is processed into a wave shape at the meshing portion between the upper roll and the lower roll, and at each top of the step. After being glued, the corrugated core paper is superposed on the back liner as a central core by being transferred to the nip portion between the pressure belt and the upper roll. The core is glued to each top in advance, and the core and the back liner receive heat from the pressure belt and the upper roll in a high temperature state, and the glue is solidified so that both are bonded to one side. It becomes a cardboard sheet.

  An example of such a single facer is described in Patent Document 1 below. In the single facer described in Patent Document 1, glue is applied to the top of the core paper stepped by a pair of corrugated rolls by a gluing device, and the liner is pressed and bonded to the core paper glued after this stepping. A hydraulic cylinder is provided to adjust the tension of the endless belt, and the tension of the belt is adjusted by controlling the hydraulic cylinder in response to different types of core paper and liner. The pressing force is weakened as the liner thickness is reduced.

Japanese Patent No. 2904757

  In the conventional single facer described above, it is possible to adjust the tension of the endless belt that presses and adheres the liner to the core paper that has been glued after feeding, and supports core paper and liners of different paper types. The belt tension is adjusted. In this case, the computer stores in advance data for obtaining the belt tension as the pressing pressure of the belt that favorably bonds the core paper and the liner in accordance with the basis weight of the liner. The optimum data corresponding to the amount is read to adjust the belt tension.

  By the way, in the single facer, the mill roll stand holds roll papers each having a core paper wound in a roll shape on both sides, and a splicer for performing paper splicing is provided above the roll paper. For this reason, when one of the roll papers remains, the other roll paper is spliced by the splicer so that the core paper can be continuously fed out from the mill roll stand toward the downstream side. In this case, when the tip of the other core paper is overlapped and connected to the rear end portion of one core paper by the splicer, the thickness of the paper joint portion of the core paper is doubled. For this reason, the corrugated core and the back liner glued to the top are pressed and heated by the pressure belt and the upper roll in a high temperature state, and the glue is solidified and bonded together. The paper splice part is thick and has an air layer between one core paper and the other core paper, so it cannot receive sufficient heat from the pressure belt or upper roll, Solidification tends to be insufficient.

  In the conventional single facer, although the tension of the belt is adjusted in accordance with the type of the core paper or liner, it does not take into account the splice portion of the core paper. In addition, the conventional single facer stores in advance the data of good belt pressing pressure corresponding to the liner basis weight, and reads the optimum data corresponding to the liner basis weight to be used to adjust the belt tension. It is adjusted. Therefore, when a single facer manufactures a single-sided cardboard sheet using one type of core paper or liner, even if a paper spliced part with different thickness reaches the nip part between the pressure belt and the upper roll, It is difficult to adjust the belt tension to an appropriate tension.

  The present invention solves the above-described problems, and appropriately heats the core joint of the core paper by increasing the pressurizing force of the upper roll and the pressure belt at an appropriate timing, in the vicinity of the paper joint. An object of the present invention is to provide an apparatus and a method for producing a single facer and a corrugated cardboard sheet, which can suppress poor adhesion between the core paper and the liner.

  To achieve the above object, the single facer of the present invention comprises corrugated outer peripheral surfaces that mesh with each other, and can corrugate the core paper, and can be heated and heated, and the corrugated core. A gluing device that applies glue to the top of the paper, a pressure belt that pressurizes and bonds the core paper and liner after gluing together with either one of the upper or lower corrugated rolls, and the upper and lower corrugations Adjusting the pressure of the core paper and the liner by the first pressure adjusting device capable of adjusting the pressure of corrugated processing of the core paper by a roll, and one of the upper and lower step rolls and the pressure belt A second pressing force adjusting device capable of increasing the pressing force of the core paper by the upper and lower corrugated rolls by the first pressing force adjusting device with respect to the splicing portion of the core paper, and the second pressing force adjustment The stage A control device for increasing the pressure of the core paper and the liner Le and by said pressure belt, is characterized in that comprises a.

  Therefore, the core paper is corrugated and heated by the upper and lower corrugated rolls, the glue is applied to the corrugated top portion by the gluing device, and is pressed and heated by the pressure belt and corrugated roll together with the liner, The glue is solidified and joined. At this time, the control device increases the pressurizing force of the core paper by the upper and lower corrugated rolls and the pressurization force of the core paper and the liner by the corrugated roll and the pressure belt to the paper splicing portion. Therefore, when the upper and lower corrugated rolls corrugate the core paper splice and heat it, the paper splice can be heated appropriately, and the corrugated roll and the pressure belt connect the core paper splice and liner. When pressurizing and heating, the paper splicing portion and the liner can be appropriately heated, and an optimum amount of heat can be applied to the glue to join the core paper and the liner. As a result, by increasing the pressurizing force of the corrugated roll and the pressure belt at an appropriate timing, it is possible to suppress adhesion failure between the core paper and the liner in the vicinity of the paper splicing portion.

  In the single facer of the present invention, the control device increases the pressurizing force by the first pressurizing pressure adjusting device and the second pressurizing pressure adjusting device based on a splicing signal obtained by splicing the core paper. It is a feature.

  Therefore, the control device increases the pressurizing force by each pressurizing force adjusting device based on the paper splicing signal, so that the splicing portion of the core paper is brought into engagement with the upper and lower corrugated rolls or the nip portion of the corrugated roll and the pressure belt. When the pressure reaches, the pressurizing force of both has already been increased, and the increase of the pressurizing force on the corrugated roll or pressure belt is not delayed. It can be heated by applying a high pressure.

  In the single facer of the present invention, the control device simultaneously increases the pressurizing force by the first pressurizing pressure adjusting device and the second pressurizing pressure adjusting device based on a splicing signal obtained by splicing the core paper. It is characterized by.

  Therefore, by simultaneously increasing the pressure applied by the first pressure adjusting device and the pressure applied by the second pressure adjusting device, a desired pressure can be applied to the paper spliced portion without missing the paper spliced portion. it can.

  In the single facer of the present invention, the control device increases the pressurizing force at different times by the first pressurizing pressure adjusting device and the second pressurizing pressure adjusting device based on a splicing signal obtained by splicing the core paper. It is characterized by letting.

  Therefore, by increasing the pressurizing force of the first pressurizing pressure adjusting device and the pressurizing force of the second pressurizing pressure adjusting device at different times, a desired pressure is applied to the paper splicing portion without missing the paper splicing portion. In addition, an overload can be prevented by the pressure belt. Preferably, it is preferable to increase the pressure of the pressure belt after a predetermined time (for example, about 3 seconds) after increasing the pressure of the upper and lower rolls.

  The single facer of the present invention includes a splicing device that performs a splicing process of the old core paper and the new core paper, and the control device is configured to perform the first pressure application based on a splicing signal related to a splicing operation. The pressurizing force is increased by an adjusting device.

  Therefore, since the upper and lower rolls are pressurized by the paper splicing signal of the paper splicing device, a desired pressure can be applied to the paper splicing section without missing the paper splicing section. In this case, it is possible to prevent an increase in cost by adding no additional sensor or the like.

  In the single facer of the present invention, a first sensor for detecting the paper splicing portion is provided upstream of the upper and lower corrugated rolls in the flow direction of the core paper, and the control device receives the paper splicing from the first sensor. When a signal is input, the pressurizing force is increased by the first pressurizing pressure adjusting device.

  Therefore, when the first sensor detects the paper splicing portion, the pressure is increased by the first pressure adjusting device, so that the paper splicing portion can be detected with high accuracy, and the paper splicing portion is not missed. The desired pressure can be applied.

  In the single facer of the present invention, the control device calculates a timing at which the paper splicing portion reaches the first pressurizing pressure adjusting device, and the first pressurizing pressure adjusting device according to the paper splicing portion arrival timing. It is characterized by increasing the pressure.

  Accordingly, since the pressure is increased by the first pressure adjusting device in accordance with the timing at which the paper splicing portion reaches the first pressure adjusting device, early pressure increase by the paper splicing signal is unnecessary, and the first pressure is increased. An overload in the adjusting device can be prevented. In this case, it is possible to prevent an increase in cost by adding no additional sensor or the like.

  The single facer of the present invention includes a splicing device that performs a splicing process of the old core paper and the new core paper, and the control device is configured to perform the second pressurizing force based on a splicing signal related to a splicing operation. The pressurizing force is increased by an adjusting device.

  Accordingly, since the pressure belt is increased by the paper splicing signal of the paper splicing device, a desired pressure can be applied to the paper splicing section without missing the paper splicing section. In this case, it is possible to prevent an increase in cost by adding no additional sensor or the like.

  In the single facer of the present invention, a first sensor for detecting the paper splicing portion is provided upstream of the upper and lower corrugated rolls in the flow direction of the core paper, and the control device receives the paper splicing from the first sensor. When a signal is input, the second pressurizing pressure adjusting device increases the pressurizing force.

  Therefore, when the first sensor detects the paper splicing portion, the pressure is increased by the second pressure adjusting device, so that the paper splicing portion can be detected with high accuracy, and the paper splicing portion is not missed. The desired pressure can be applied.

  In the single facer according to the present invention, the control device calculates a timing at which the paper splicing portion reaches the second pressurizing force adjusting device, and the second pressurizing pressure adjusting device determines the timing at which the paper splicing portion arrives. It is characterized by increasing the pressure.

  Accordingly, since the pressurizing force is increased by the second pressurizing pressure adjusting device in accordance with the timing at which the paper splicing portion reaches the second pressurizing pressure adjusting device, the early pressurization by the paper splicing signal is not necessary, and the second pressurizing pressure is not required. An overload in the adjusting device can be prevented. In this case, it is possible to prevent an increase in cost by adding no additional sensor or the like.

  In the single facer of the present invention, the pressure belt is an endless belt wound around and supported by a pair of rolls, and at least one of the pair of rollers is separated from the second pressure adjusting device. It is characterized by increasing the pressure by moving in the direction.

  Therefore, it is possible to perform suitable adhesion to the paper splicing portion by further covering the bonding of the low-temperature portion of the core paper on the glue roll side in the paper splicing portion by increasing the belt pressure.

  In the single facer of the present invention, the control device receives the paper splicing portion passage signal when the splicing portion of the core paper has passed through the nip portion of the corrugated roll and the pressure belt. The pressurizing force is reduced to the pressure before the increase by the pressurizing force adjusting device and the second pressurizing pressure adjusting device.

  Therefore, when the paper splicing section passage signal is input, the control device decreases the pressure applied by the first pressure adjusting device and the second pressure adjusting device to the pressure before the increase, so By limiting the processing area of the core paper due to a large pressing force to the minimum necessary, it is possible to reduce the load on the corrugated roll and the pressure belt and improve the durability.

  In the single facer of the present invention, a second sensor for detecting the paper splicing portion is provided downstream of the nip portion between the corrugated roll and the pressure belt in the flow direction of the core paper, and the control device includes: When the paper splicing section passage signal is input from the second sensor, the pressurizing force is reduced to the pressure before the increase by the first pressurizing pressure adjusting device and the second pressurizing pressure adjusting device.

  Accordingly, a second sensor for detecting the paper splicing portion is provided downstream of the nip portion between the corrugating roll and the pressure belt, and the control device receives the paper splicing portion passage signal from the second sensor and In order to reduce the pressure applied to the core paper by the corrugated roll or pressure roll to the pressure before the increase, in order to properly detect that the paper splice has passed through the nip between the corrugated roll and the pressure belt, The reliability of the pressure adjustment control in the pressure belt can be improved.

  In the single facer of the present invention, the core paper has a detection unit fixed to a paper splicing unit, and the sensor detects the paper splicing unit by detecting the detection unit.

  Therefore, each sensor detects the detection part fixed to the paper splicing part, so that the paper splicing part has reached before the meshing part in the upper and lower corrugated rolls, and the nip part between the corrugating roll and the pressure belt is detected. This means that the passage has been grasped, and the reliability of the pressure adjustment control in the corrugated roll and the pressure belt can be improved.

  The corrugated sheet manufacturing apparatus of the present invention is manufactured by a single facer for manufacturing a single-faced corrugated sheet by laminating a second liner (for example, a back liner) to a corrugated core paper, and the single facer. A cardboard sheet manufacturing apparatus comprising: a double facer for manufacturing a double-sided cardboard sheet by laminating a first liner (for example, a front liner) to a core paper side of the single-sided cardboard sheet. The single facer according to any one of 6 is applied.

  Therefore, the single facer manufactures a single-sided cardboard sheet by laminating the second liner to the corrugated core, and the double facer has the first liner on the core side of the single-sided cardboard sheet manufactured by the single facer. Laminate to produce a double-sided cardboard sheet. At this time, with a single facer, the core paper is corrugated by upper and lower corrugated rolls, glue is applied to the corrugated top by a gluing device, and is joined by being pressed by the pressure belt and corrugated roll together with the liner. The At this time, the control device controls the pressure adjusting device based on the paper splicing signal to increase the pressure applied to the core paper by the upper and lower corrugated rolls. Therefore, when the upper and lower corrugated rolls corrugate the spliced portion of the core paper, the separation of the corrugated rolls is suppressed, and the corrugated portion and the core paper in the vicinity of the spliced portion are processed to an appropriate corrugated height. be able to. As a result, by increasing the corrugating force applied by the upper and lower corrugated rolls at the appropriate timing, the irregular corrugation in the core paper near the paper splice is suppressed, and poor adhesion to the liner is suppressed. And a high quality cardboard sheet can be manufactured.

  The corrugated board sheet manufacturing method according to the present invention includes a splicing step with a splicer, a step of detecting a paper splicing portion, and pressure applied to upper and lower corrugated rolls and a pressure belt based on the detection of the splicing portion. And a step of increasing.

  Therefore, when the upper and lower corrugating rolls corrugate the core paper splice and heat it, the paper splicing section can be heated appropriately, and the corrugated roll and the pressure belt connect the core paper splice and liner. When pressurizing and heating, the paper splicing portion and the liner can be appropriately heated, and an optimum amount of heat can be applied to the glue to join the core paper and the liner. As a result, by increasing the pressurizing force of the corrugated roll and the pressure belt at an appropriate timing, it is possible to suppress adhesion failure between the core paper and the liner in the vicinity of the paper splicing portion.

In the method for producing a corrugated cardboard sheet according to the present invention, a step of reducing the pressure applied to the upper and lower corrugated rolls and the pressure belt after the paper splicing portion has passed through the pressure belt is provided.
Therefore, by keeping the processing area of the core paper due to the large pressurizing force of the corrugated roll and the pressure belt, the load on the corrugated roll and the pressure belt can be reduced and the durability can be improved.

  According to the apparatus and method for producing a single facer and corrugated cardboard sheet of the present invention, the pressurizing force of the core paper by the upper and lower corrugated rolls is increased with respect to the core paper joint, and the corrugated roll and the pressure belt are used. Since the pressing force of the core paper and liner is increased, by increasing the pressing force of the corrugated roll and the pressure belt at an appropriate timing, the core paper splicing portion can be heated appropriately and in the vicinity of the paper splicing portion. Inadequate adhesion between the core paper and the liner can be suppressed.

FIG. 1 is a schematic view of a corrugated board sheet manufacturing apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating a mill roll stand and a splicer in the single facer of the first embodiment. FIG. 3 is a schematic diagram illustrating a single facer according to the first embodiment. FIG. 4A is a schematic diagram illustrating a paper splicing portion in the center core. FIG. 4B is a schematic diagram illustrating a corrugated state of the paper splicing portion in the conventional core. FIG. 4-3 is a schematic diagram illustrating a pasted state between a conventional core and a back liner. FIG. 5A is a schematic diagram illustrating a waveform processing state of the paper splicing portion in the core of the first embodiment. FIG. 5-2 is a schematic diagram illustrating a state in which the core and the back liner of Example 1 are bonded to each other. FIG. 6 is a schematic diagram illustrating a single facer according to the second embodiment of the present invention. FIG. 7 is a time chart showing the pressurization state in the single facer according to the second embodiment of the present invention.

  Exemplary embodiments of a single facer and cardboard sheet manufacturing apparatus and method according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  1 is a schematic view of a corrugated board sheet manufacturing apparatus according to Embodiment 1 of the present invention, FIG. 2 is a schematic view showing a mill roll stand and a splicer in the single facer of Embodiment 1, and FIG. Fig. 4-1 is a schematic diagram showing a paper splicing portion in the center core, and Fig. 4-2 is a schematic diagram showing a corrugated state of the paper splicing portion in the conventional core. 4-3 is a schematic diagram showing a pasted state of the conventional core and the back liner, FIG. 5-1 is a schematic diagram showing a corrugated state of the paper splicing portion in the core of Example 1, FIG. 2 is a schematic diagram illustrating a state in which the core and the back liner of Example 1 are bonded to each other.

  In Example 1, as shown in FIG. 1, a corrugating machine 10 as a corrugated cardboard manufacturing apparatus has, for example, a back liner C as a second liner bonded to a corrugated core (core paper) B. A single facer 25 for manufacturing a single-sided cardboard sheet D, and a double-sided cardboard sheet E by laminating a front liner A as a first liner on the core B side of the single-sided cardboard sheet D manufactured by the single facer 25, for example. And a double facer 34 to be manufactured.

  In addition to the single facer 25, the corrugating machine 10 includes a mill roll stand 21 and a preheater (preheater) 22 for the core B, a mill roll stand 23 and a preheater (preheater) 24 for the back liner C, and a bridge. 26. In addition to the double facer 34, the corrugating machine 10 includes a mill roll stand 31 of the front liner A, a preheater (preheating device) 32, a glue machine 33, a rotary 35, a slitter scorer 36, and a cut-off 37. And a stacker 38.

  The mill roll stand 21 is provided with a roll paper in which a core paper having a core B formed on each side is wound in a roll shape, and a splicer (paper splicing device) 21 a for performing paper splicing is provided above the mill roll stand 21. Is provided. When paper is fed from one roll paper, the other roll paper is loaded and paper splicing preparation is made. When the remaining base paper of one roll paper decreases, the splicer 21a joins the base paper of the other roll paper. Then, while the base paper is being supplied from the other roll paper, one roll paper is loaded and paper splicing preparation is made. In this way, the base paper is sequentially spliced and continuously fed out from the mill roll stand 21 toward the downstream side.

  On the other hand, the mill roll stand 23 is provided with roll paper on which the back liner C is wound on both sides, and a splicer 23a for performing paper splicing is provided above the roll paper. When paper is fed from one roll paper, the other roll paper is loaded and paper splicing preparation is made. When the remaining base paper of one roll paper decreases, the splicer 23a joins the base paper of the other roll paper. Then, while the base paper is being supplied from the other roll paper, one roll paper is loaded and paper splicing preparation is made. In this way, the base paper is sequentially spliced and continuously fed out from the mill roll stand 23 toward the downstream side.

  Hereinafter, the mill roll stands 21 and 23 have substantially the same configuration, and here, the mill roll stand 21 corresponding to the core B will be described in detail. In the mill roll stand 21, as shown in FIG. 2, a pair of roll support arms 72a and 72b are provided on both sides of the stand 71, and the roll papers B1 and B2 can be rotatably supported, respectively. The roll papers B1 and B2 are rolls of core paper of a predetermined length, and are processed into upper and lower corrugated rolls 44 and 45, which will be described later, to become a corrugated core B. In this case, the roll paper B1 supported by one roll support arm 72a is fed out and supplied, and the other roll support arm 72b puts the roll paper B2 in a splicing standby state.

  In the splicer 21a, a pair of left and right introduction rolls 74a and 74b, a pair of left and right knives 75a and 75b, and a pair of left and right crimping bars 76a and 76b are disposed on the header 73 from below, and a nip roll 77a is disposed above the pair. Acceleration rolls 77b are mounted facing each other. In this case, the introduction rolls 74a and 74b, the knives 75a and 75b, and the crimping bars 76a and 76b are provided so as to be close to and away from each other. A nip roll 77a is provided so as to be able to approach and separate from the acceleration roll 77b. A dancer roll 78 and a fixed roll 79 are disposed above the nip roll 77a and the acceleration roll 77b. The dancer roll 78 is movable in the horizontal direction according to the tension of the core paper.

  Therefore, when the core paper is fed out from the roll paper B1, this core paper passes between the introduction rolls 74a and 74b, and then passes between the knives 75a and 75b and between the crimping bars 76a and 76b, and from the acceleration roll 77b to the dancer roll. It is fed through a fixed roll 79 via 78b. When splicing is performed by the splicer 21a, the core paper from the roll paper B1 stops feeding, the core paper fed from the standby roll paper B2 is attached, the paper is added, and then the operation speed is reached. To accelerate.

  That is, the operator feeds the core paper from the roll paper B2 and mounts it on the crimping bar 76b. Next, when the core paper from the roll paper B1 decelerates feeding, the dancer roll 78 starts to move to the left in FIG. 2 and starts consuming the core paper that remains. Thereafter, when the feeding out of the core paper from the roll paper B1 is stopped, the crimping bars 76a and 76b are brought close to each other to press the core paper from the roll paper B2 and the core paper from the roll paper B1 and to press-bond with an adhesive. Simultaneously with this operation, the knife 75a advances to cut the core paper from the roll paper B1.

  During this operation, the dancer roll 78 moves and keeps the core paper from the roll paper B2 constant, while continuing to release the staying core paper. When the core paper from the roll paper B1 is cut and the core paper is fed out from the roll paper B2, the nip roll 77a is brought into contact with the acceleration roll 77b, and the rotation speed of the acceleration roll 77b is increased. The release of the core paper is finished, and the dancer roll 78 starts to move rightward in FIG. 2 and returns to the original position.

  Returning to FIG. 1, each preheater 22, 24 preheats the core B and the back liner C, respectively. Each preheater 22 and 24 has a heating roll to which steam is supplied inside, and the base paper (core B, back liner C) continuously fed from the mill roll stands 21 and 23 is used as this heating roll. The base paper is heated to a predetermined temperature by being wound and conveyed.

  As shown in FIG. 3, the single facer 25 includes an endless pressure belt 43 wound around a belt roll 41 and a tension roll 42, and a surface formed in a wave shape so that the pressure belt 43 is pressurized. The upper roll 44 is in contact with the upper roll 44, and the lower roll 45 has a wave-like surface and meshes with the upper roll 44. The back liner C heated by the preheater 24 is wound around the liner preheating roll 46 and preheated on the way, and then guided by the belt roll 41 and together with the pressure belt 43, the pressure belt 43 and the upper roll 44. It is transferred to the nip part. On the other hand, the core B heated by the preheater 22 is wound around the core preheating roll 47 and preheated on the way, and after being processed into a wave shape at the meshing portion between the upper roll 44 and the lower roll 45, It is guided by the upper roll 44 and transferred to the nip portion between the pressure belt 43 and the upper roll 44.

  A gluing device 48 is disposed in the vicinity of the upper roll 44. The gluing device 48 includes a gluing dam 49 that stores gluing, a gluing roll 50 that glues the core B conveyed by the upper roll 44, and a meter roll that adjusts the amount of gluing applied to the peripheral surface of the gluing roll 50. 51 and a glue scraping blade 52 that scrapes glue from the meter roll 51. The core B that has been fed at the meshing portion between the upper roll 44 and the lower roll 45 is glued to each top of the stage by the gluing roll 50, and is attached to the back liner C at the nip portion between the pressure belt 43 and the upper roll 44. A single-sided cardboard sheet D is formed by bonding.

  Further, the belt roll 41, the tension roll 42, the upper roll 44, and the lower roll 45 are all heated with steam flowing therein. Therefore, the core B is heated when being pressed and processed into a wave shape by the meshing portion between the upper roll 44 and the lower roll 45. Then, after the glue is applied to the top of the step by the gluing roll 50, the core B is pressurized and heated when it is overlapped with the back liner C by the pressure belt 43 and the upper roll 44. This glue receives a predetermined amount of heat and increases its adhesive force to solidify. The core B and the back liner C receive heat from the upper and lower corrugated rolls 44 and 45 and the pressure belt 43. Bonded by solidifying.

  Returning to FIG. 1, a pick-up conveyor 53 is provided obliquely above and downstream of the single facer 25 in the conveying direction. The take-up conveyor 53 is composed of a pair of endless belts and has a function of sandwiching the single-sided cardboard sheet D formed in the single facer 25 and transporting it to the bridge 26. The bridge 26 functions as a retention portion for temporarily retaining the single-sided cardboard sheet D in order to absorb the speed difference between the single facer 25 and the double facer 34.

  The mill roll stand 31 is provided with roll paper on which the front liner A is wound in rolls on both sides, and a splicer 31a for performing paper splicing is provided above the roll paper. When paper is fed from one roll paper, the other roll paper is loaded and paper splicing preparation is made. When the remaining base paper of one roll paper is reduced, the splicer 31a joins the base paper of the other roll paper. Then, while the base paper is being supplied from the other roll paper, one roll paper is loaded and paper splicing preparation is made. In this way, the base paper is sequentially spliced and continuously fed from the mill roll stand 31 toward the downstream side.

  The preheater 32 has a heating roll for the single-sided cardboard sheet D (hereinafter referred to as a single-stage sheet heating roll) 61 and a heating roll for the front liner A (hereinafter referred to as a front liner heating roll) 62. The single-stage sheet heating roll 61 has a winding amount adjusting device and is heated to a predetermined temperature by supplying steam therein, and the back liner C side of the single-sided cardboard sheet D is wound around the circumferential surface. The single-sided cardboard sheet D can be preheated. On the other hand, the front liner heating roll 62 similarly has a winding amount adjusting device and is heated to a predetermined temperature by supplying steam therein, and the front liner A is wound around the peripheral surface. The front liner A can be preheated.

  The glue machine 33 has a gluing device and a pressure device. The single-sided corrugated cardboard sheet D heated by the single-stage sheet heating roll 61 is guided in the glue machine 33 on the way, and is glued to each top of the stage of the core B when passing between the rider roll and the gluing roll. Is done.

  The single-sided cardboard sheet D glued by the glue machine 33 is transferred to the double facer 34 of the next process. The front liner A heated by the front liner heating roll 62 is also transferred to the double facer 34 through the glue machine 33.

  The double facer 34 is divided into a heating section 34a on the upstream side and a cooling section 34b on the downstream side along the running line of the single-sided cardboard sheet D and the front liner A. The single-sided cardboard sheet D glued by the glue machine 33 is carried between the pressure belt 63 and the heating platen 64 by this heating section 34a, and the front liner A is placed on the core B side of the single-sided cardboard sheet D. Are carried between the pressure belt 63 and the heating plate 64 so as to overlap with each other. Then, after the single-sided cardboard sheet D and the front liner A are carried between the pressure belt 63 and the hot platen 64, the single-sided cardboard sheet D and the front liner A are integrally transferred toward the cooling section 34b in a state where they are overlapped vertically. During this transfer, the single-sided cardboard sheet D and the front liner A are heated while being pressed, so that they are bonded together to form a double-sided cardboard sheet E. The double-sided cardboard sheet E is naturally cooled when being conveyed while being sandwiched between the pressure belt 63 and the conveyance belt 65 in the cooling section 34b.

  The double-faced cardboard sheet E produced by the double facer 34 is transferred to the rotary 35. The rotary 35 cuts the double-sided corrugated cardboard sheet E in the width direction in full width or partially. The slitter scorer 36 cuts a wide double-sided corrugated cardboard sheet E so as to have a predetermined width in the transport direction, and processes a ruled line extending in the transport direction. The slitter scorer 36 includes a first slitter scorer unit 36a and a second slitter scorer unit 36b, which are arranged along the conveying direction of the double-faced cardboard sheet E and have substantially the same structure. The first slitter scorer unit 36a and the second slitter scorer unit 36b have a plurality of sets of upper ruled line rolls and lower ruled line rolls arranged facing each other with the double-sided cardboard sheet E interposed therebetween, and A plurality of slitter knives arranged on the lower side are provided in the width direction.

  The cut-off 37 cuts the double-sided corrugated cardboard sheet E cut in the transport direction by the slitter scorer 36 in the width direction to form a plate shape. The cut-off 37 is a slitter scorer 36 that receives and processes two double-sided corrugated cardboard sheets E cut into a predetermined width along the conveying direction in two upper and lower stages, and both have substantially the same configuration. It has become. The stacker 38 stacks the double-sided corrugated cardboard sheets E cut by the cut-off 37 and discharges them as products to the outside of the machine.

  By the way, as shown in FIG. 2, for example, when the core paper from one roll paper B1 decreases, the splicer 21a waits for the roll paper B2 waiting on the core paper (hereinafter referred to as old core paper) from the roll paper B1. A paper splicing operation for pasting a core paper (hereinafter referred to as a new core paper) is performed. In this case, after the front end portion of the new core paper is pasted on the old core paper, the rear end portion (downstream end) side of the old core paper is cut, and as shown in FIG. The rear end portion and the leading end portion of the new core paper B21 are connected by the double-sided adhesive tape T to form the paper splicing portion B3. For this reason, the paper splice B3 is at least twice the thickness of the core paper.

  Then, when the core paper splicing portion B3 is caught between the upper and lower corrugated rolls 44 and 45 in the single facer 25, the core paper (paper splicing portion B3) is corrugated as shown in FIG. However, the corrugated height H of the core paper is not uniform in the vicinity of the paper splice B3. That is, although the old core paper B11 and the new core paper B21 have the same corrugated height H, a step H1 occurs between the old core paper B11 and the new core paper B21. Further, since the old core paper B11 and the new core paper B21 are overlapped and connected, the thickness of the paper splicing portion B3 is doubled, and between the overlapped old core paper B11 and the new core paper B21. An air layer is formed. For this reason, in the spliced portion B3 between the old core paper B11 and the new core paper B21, heat is not easily transmitted from the upper and lower corrugated rolls 44 and 45, and heating is insufficient.

  Further, the corrugated core paper that has been corrugated by the upper and lower corrugated rolls 44 and 45 is glued to each top by the glue roll 50, and then the core paper is overlapped with the back liner C as the middle core B. Pressure is applied between the upper roll 44. At this time, as shown in FIG. 4-3, the old core paper B11 is positioned on the pressure belt 43 side (upper side), and the new core paper B21 is positioned on the upper roll 44 side (lower side). Here again, the thickness of the paper splicing portion B3 in which the old core paper B11 and the new core paper B21 are overlapped and connected is doubled, and the old core paper B11 and the new core paper B11 are new. Since there is an air layer between the core papers B <b> 21, it becomes difficult for heat to be transmitted from the pressure belt 43 and the upper roll 44, and heating becomes insufficient. As a result, it becomes difficult to solidify the glue between the core B and the back liner C, and there is a risk of poor adhesion.

  Therefore, as shown in FIGS. 2 and 3, the single facer 25 of the first embodiment has a first pressure that can adjust the pressure applied to corrugating the core paper (core B) by the upper and lower corrugated rolls 44 and 45. With respect to the pressure adjusting device 81, the second pressure adjusting device 86 capable of adjusting the pressing force of the core B and the back liner C by the upper roll 44 and the pressure belt 43, and the second splicing portion B3 of the core paper. The pressurizing force of the core paper by the upper and lower corrugated rolls 44 and 45 is increased by the 1 pressurizing force adjusting device 81 and the core B and the back liner C by the upper roll 44 and the pressure belt 43 are increased by the second pressurizing force adjusting device 86. And a control device 82 for increasing the applied pressure.

  In this case, as an example, in the splicer 21a, the old core paper B11 from the roll paper B1 and the new core paper B21 from the roll paper B2 actuate the pair of left and right crimping bars 76a and 76b, and the old core paper B11 and the new core paper. After B21 is bonded, the operation of the knife 75a for cutting the old core paper B11 is used as a paper splicing signal. When this paper splicing signal is input, the control device 82 increases the pressurizing force of the core paper (core B) by the upper and lower corrugated rolls 44 and 45 by the first pressurizing adjustment device 81 and the second pressurizing force. The adjusting device 86 increases the pressure applied to the core B and the back liner C by the upper roll 44 and the pressure belt 43.

  That is, the first pressure adjusting device 81 has a hydraulic cylinder 84, and the tip end portion of the drive rod 84 a extending upward is connected to the support shaft 45 a of the lower roll 45. Therefore, the control device 82 can move the drive rod 84 a up and down by controlling the supply and discharge of the hydraulic pressure to the hydraulic cylinder 84. Therefore, the first pressure adjusting device 81 presses the lower roll 45 toward the upper roll 44 via the support shaft 45a when the drive rod 84a moves upward, and the first pressurizing adjustment device 81 is positioned between the upper and lower rolls 44, 45. The pressing force of the core paper (core B) to be conveyed can be increased, while the drive rod 84a moves downward to separate the lower roll 45 from the upper roll 44 via the support shaft 45a, The pressure applied to the core paper (core B) conveyed between the upper and lower corrugated rolls 44 and 45 can be reduced.

  The second pressure adjusting device 86 has a hydraulic cylinder 87, and the tip of a drive rod 87 a extending obliquely downward is connected to the support shaft 42 a of the tension roll 42. Therefore, the control device 82 can move the drive rod 87 a up and down by controlling the supply and discharge of the hydraulic pressure to and from the hydraulic cylinder 87. Therefore, the second pressure adjusting device 86 moves the tension roll 42 to the side away from the belt roll 41 via the support shaft 42 a by moving the drive rod 87 a obliquely downward, and the tension of the pressure belt 43. Can be raised and pressed against the upper roll 44 to increase the pressure applied to the core B and the back liner C conveyed between the upper roll 44 and the pressure belt 43, while the drive rod 87a is obliquely upward. , The tension roll 42 is moved to the side closer to the belt roll 41 via the support shaft 42a, the tension of the pressure belt 43 is lowered and separated from the upper roll 44, and the upper roll 44 is pressurized. The pressing force of the core B and the back liner C conveyed between the belts 43 can be reduced.

  In this case, the pressure belt 43 is an endless belt wound around and supported by the belt roll 41 and the tension roll 42, and the second pressure adjusting device 86 is a direction in which the tension roll 42 is separated from the belt roll 41. The pressure applied to the pressure belt 43 is increased. Therefore, it is possible to perform suitable adhesion to the paper splicing portion by further covering the bonding of the low-temperature portion of the core paper on the glue roll side in the paper splicing portion by increasing the belt pressure.

  Here, in the single facer 25, the pressure adjustment control for the core paper (middle core B) of the upper and lower step rolls 44 and 45 by the first pressure adjustment device 81 and the upper stage by the second pressure adjustment device 86. The pressure adjustment control for the core 44 and the back liner C of the roll 44 and the pressure belt 43 will be described in detail.

  As shown in FIG. 2, when the core paper is fed out from the roll paper B1 of the mill roll stand 21, the core paper is sent to the single facer 25 after a predetermined length is stored by the dancer roll 78b. In the single facer 25, as shown in FIG. 3, the core B is processed into a wave shape at the meshing portion between the upper roll 44 and the lower roll 45 and heated, and then glued to each top by a gluing device 48. The pressure belt 43 and the upper roll 44 are sent to the nip portion. On the other hand, the back liner C is guided by the belt roll 41 and transferred to the nip portion between the pressure belt 43 and the upper roll 44. Here, the core B and the back liner C are processed by the pressure belt 43 and the upper roll 44 and heated, whereby the glue is solidified and bonded together to form a single-sided cardboard sheet D.

  When the roll paper B1 of the mill roll stand 21 is reduced to a predetermined amount, the splicing work is performed by the splicer 21a. That is, in a state where the feeding of the core paper from the roll paper B1 is stopped, the core paper is pressed and joined from the roll paper B2, and at the same time, the core paper from the roll paper B1 is cut. Then, the paper feed from the roll paper B1 is completed, and the paper feed from the roll paper B2 is started. At this time, a paper splicing signal is output to the control device 82 by this paper splicing operation. In the first embodiment, the paper splicing signal is a processing signal generated by the operation of the knife 75a. However, the processing signal is not limited to this processing signal. For example, the paper splicing that is output at the time of processing related to the paper splicing operation (when the splicing starts, during the splicing operation, or when the splicing operation is completed) such as the start of feeding from the roll paper B2 or the acceleration of the acceleration roll 77b Any signal can be used. The splicing signal is not limited to an electrical signal related to the operation of the splicer 21a, but is generated from an operation related to the splicing work regardless of the operation of the splicer 21a.

  The control device 82 operates the first pressure adjusting device 81 by this paper splicing signal, increases the pressing force of the upper roll 44 against the lower roll 45 by the hydraulic cylinder 84, and the core paper by the upper and lower stage rolls 44, 45. Increase the pressing force of (core B). Further, at this time, the control device 82 operates the second pressure adjusting device 86 to increase the pressing force of the pressure belt 43 against the upper roll 44 by the hydraulic cylinder 87, and the intermediate pressure between the upper roll 44 and the pressure belt 43 is increased. Increase pressure on core B and back liner C.

  In a state in which the pressure applied by the upper and lower corrugated rolls 44 and 45 is increased, the joint portion B3 between the old core paper from the roll paper B1 and the new core paper from the roll paper B2 is engaged with the upper and lower corrugated rolls 44 and 45. When the upper and lower corrugated rolls 44 and 45 process the corrugated portion B3, the upper and lower corrugated rolls 44 and 45 are separated from each other because the pressurizing force of the corrugated rolls 44 and 45 is large. The movement in the direction is suppressed, and the paper splice B3 and the core paper in the vicinity of the paper splice B3 can be processed to an appropriate waveform height. Further, since the core paper (middle core B) is pressed with a high pressure, the adhesion between the old core paper and the new core paper at the paper joint B3 is increased, and heat is transmitted to the bonding surface of both. It can be heated properly.

  Further, in the state in which the pressure applied by the upper roll 44 and the pressure belt 43 is increased, the center core B and the back liner C, that is, the paper joint portion B3 between the old core paper and the new core paper is formed by the upper roll 44 and the pressure belt. 43, when the upper roll 44 and the pressure belt 43 press the paper splicing portion B3, the pressurizing force of the upper roll 44 and the pressure belt 43 is large. The core B in the vicinity of the joint B3 can be pressed with great pressure. For this reason, the core B and the back liner C have a high adhesion force between the paper splice B3 of the core B and the back liner C, and can transmit heat to the bonding surfaces of both to appropriately heat them.

  That is, as shown in FIG. 4A, after the rear end portion of the old core paper B11 and the front end portion of the new core paper B21 are connected by the double-sided adhesive tape T to form the paper splice portion B3, When B3 is bitten between the upper and lower corrugated rolls 44, 45, as shown in FIG. 5-1, since the pressing force of each corrugated roll 44, 45 is large, the core paper B11, The waveform height of B21 is unlikely to be uneven, and the top portion is along the straight line L, and a step is unlikely to occur between the two. Further, at this time, since the pressurizing force of the upper and lower corrugated rolls 44 and 45 is high, it is heated into the paper splicing portion B3. For this reason, the gluing roll 50 can appropriately glue by properly contacting the paper splicing portion B3 and each top portion in the vicinity of the paper splicing portion B3.

  Thereafter, when the core paper is glued as the middle core B and overlapped with the back liner C and is pressed between the pressure belt 43 and the upper roll 44, as shown in FIG. Since the pressure applied by the pressure belt 43 is large, the paper liner B3 of the back liner C and the core B and the vicinity of the paper joint B3 are pressed with great pressure. Then, there is no gap between the core B and the back liner C, and heat is transferred to the glue between the core B and the back liner C. Adhering properly without causing poor adhesion.

  Thus, in the single facer of the first embodiment, the upper and lower corrugated rolls 44 and 45 having corrugated outer peripheral surfaces meshing with each other and capable of corrugating the core paper, and corrugated core paper (middle core) B) a gluing device 48 that applies glue to the top of the step, a pressure belt 43 that presses and joins the glued core paper and the back liner C to the upper roll 44, and a core formed by upper and lower step rolls 44 and 45. A first pressure adjusting device 81 capable of adjusting the pressure applied to corrugated paper, and a second pressure adjusting device capable of adjusting the pressure applied to the core B and the back liner C by the upper roll 44 and the pressure belt 43. 86, the pressure applied by the upper and lower step rolls 44, 45 is increased by the first pressure adjusting device 81 with respect to the spliced portion of the core paper, and the upper roll 44 and the pressure belt 43 are increased by the second pressure adjusting device 86. Control device for increasing the pressure applied by It is provided and 2.

  Therefore, the core paper is corrugated and heated by the upper and lower corrugated rolls 44 and 45, the glue is applied to the top of the corrugated section by the gluing device 48, and is applied by the pressure belt 43 and the upper roll 44 together with the back liner C. Bonded by being pressed and heated. At this time, the control device 82 controls the first pressurizing force adjusting device 81 for the paper splicing portion B3 to increase the pressurizing force of the core paper by the upper and lower corrugated rolls 44 and 45 and to adjust the second pressurizing force. The apparatus 86 is controlled to increase the pressure applied to the core B and the back liner C by the upper roll 44 and the pressure belt 43. Therefore, when the upper and lower corrugated rolls 44 and 45 wave-process and heat the paper splicing section B3 of the core paper, the paper splicing section B3 can be appropriately heated, and the upper corrugating roll 44 and the pressure belt 43 are in the middle core. When pressurizing and heating the paper joint B3 and the back liner C of B, the paper joint B3 and the back liner C can be appropriately heated, and an optimum amount of heat is added to the glue to add the core B to the back. Liner C can be joined. As a result, by increasing the pressurizing force of the upper roll 44 and the pressure belt 43 at an appropriate timing, it is possible to suppress poor adhesion between the core B and the back liner C in the vicinity of the paper splicing portion B3.

  In the single facer of the first embodiment, a splicer 21a for performing a splicing process of the old core paper B11 and the new core paper B21 is provided, and the controller 82 is configured to splice the old core paper B11 and the new core paper B21. On the basis of the paper splicing signal, the first pressure adjusting device 81 increases the pressing force of the core paper (core B) by the upper and lower corrugated rolls 44, 45, and the second pressure adjusting device 86 increases the upper step. The pressing force of the core B and the back liner C by the roll 44 and the pressure belt 43 is increased. Therefore, when the paper splicing portion B3 reaches the meshing portion of the upper and lower corrugated rolls 44 and 45, the pressure applied by the upper and lower corrugated rolls 44 and 45 is already increased, and the paper splicing portion B3 is moved to the upper corrugating roll 44 and the pressure belt 43. The pressure applied by the upper roll 44 and the pressure belt 43 has already been increased. Therefore, the increase in the pressurizing force in the upper and lower corrugated rolls 44 and 45 is not delayed, and the upper and lower corrugated rolls 44 and 45 can press and heat the paper splicing portion B3 with an appropriate pressurizing force. The increase in the pressurizing force in the roll 44 and the pressurizing belt 43 is not delayed, and the upper roll 44 and the pressurizing belt 43 can heat the paper splicing portion B3 with an appropriate pressurizing force.

  In the corrugated cardboard sheet manufacturing apparatus of the first embodiment, the single facer 25 for manufacturing the single-sided corrugated cardboard sheet D by laminating the back liner C to the corrugated core paper (core B), and the single facer A double facer 34 for producing a double-faced corrugated cardboard sheet E by laminating a front liner A on the core B side of the single-faced corrugated cardboard sheet D produced by the saw 25 is provided, and the upper and lower corrugated rolls 44, 45 are provided by the single facer 25. The second pressurizing force 81 can adjust the pressurizing force of the core B and the back liner C by the upper roll 44 and the pressure belt 43. The pressurizing force by the upper and lower step rolls 44 and 45 is increased by the first pressurizing force adjusting device 81 with respect to the adjusting device 86 and the splicing portion of the core paper, and the second pressurizing pressure adjusting device 86 is It is provided a control device 82 to increase the pressure applied by the Le 44 and the pressure belt 43.

  Accordingly, the single facer 25 manufactures a single-sided cardboard sheet D by laminating the back liner C to a corrugated core paper (core B), and the double facer 34 is a single-sided cardboard sheet manufactured by the single facer 25. A double-sided cardboard sheet E is manufactured by laminating the front liner A on the core B side in D. At this time, in the single facer 25, the control device 82 increases the pressing force of the core paper by the upper and lower corrugated rolls 44 and 45 to the paper splicing portion B 3, and the upper corrugated roll 44 and the pressure belt 43. Increase the pressure applied to the core B and the back liner C. Therefore, the upper and lower corrugated rolls 44 and 45 can appropriately heat the paper splicing portion B3, and the upper corrugated roll 44 and the pressure belt 43 can properly heat the paper splicing portion B3 and the back liner C. The core B and the back liner C can be joined to each other by applying an optimum amount of heat. As a result, by increasing the pressurizing force of the upper roll 44 and the pressure belt 43 by the paper splicing signal, it is possible to suppress poor adhesion between the core B and the back liner C in the vicinity of the paper splicing portion B3.

  FIG. 6 is a schematic diagram showing a single facer according to the second embodiment of the present invention, and FIG. 7 is a time chart showing pressurization timing in the single facer according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 6, the single facer 25 includes a first pressure adjusting device 81 that can adjust the pressure applied to corrugated processing of the core paper (core B) by the upper and lower corrugated rolls 44 and 45. The second pressure adjusting device 86 capable of adjusting the pressure applied to the core B and the back liner C by the upper roll 44 and the pressure belt 43, and the first pressure adjustment to the splicing portion B3 of the core paper. The apparatus 81 increases the pressure applied to the core paper by the upper and lower corrugated rolls 44 and 45, and the second pressure adjusting apparatus 86 increases the pressure applied to the core B and the back liner C by the upper roll 44 and the pressure belt 43. A control device 82 is provided.

  Then, when a paper splicing signal for the core paper splicing portion to reach the upper and lower corrugated rolls 44 and 45 is input, the control device 82 causes the first pressurizing adjustment device 81 to perform the middle by the upper corrugated rolls 44 and 45. While increasing the pressing force of the core B, the second pressing force adjusting device 86 increases the pressing force of the center core B and the back liner C by the upper roll 44 and the pressure belt 43. Further, the controller 82 receives the paper splice portion passage signal when the splice portion of the core paper has passed through the nip portion of the upper roll 44 and the pressure belt 43, and the first pressurizing adjustment device 81 causes the upper and lower steps to be fed. The pressing force of the core B by the rolls 44 and 45 is reduced to the pressure before the increase, and the pressing force of the core B and the back liner C by the upper roll 44 and the pressure belt 43 is reduced by the second pressing force adjusting device 86. Reduce to pre-increase pressure.

  In this case, a first paper splice detection sensor (first sensor) 91 for detecting a paper splice is provided at the inlet of the upstream side in the flow direction of the core B from the upper and lower corrugated rolls 44 and 45, and the control device 82. When the paper splicing signal is input from the first paper splicing portion detection sensor 91, the pressure applied by the pressure adjusting devices 81 and 86 is increased. Further, a second paper joint detection sensor (second sensor) 92 for detecting the paper joint is provided at the outlet portion downstream of the nip portion between the pressure belt 43 and the upper roll 44. When a paper splice portion passing signal is input from the second paper splice detection sensor 92, the pressure applied by the pressure adjusting devices 81 and 86 is reduced to the pressure before the increase.

  That is, when the paper splicing signal from the first paper splicing part detection sensor 91 is input, the control device 82 causes the first pressure adjusting device 81 to feed the core paper (middle core B) by the upper and lower corrugated rolls 44 and 45. While increasing the pressing force, the second pressing force adjusting device 86 increases the pressing force of the core B and the back liner C by the upper roll 44 and the pressure belt 43. When the paper splicing portion of the core B passes through the nip portion between the pressure belt 43 and the upper roll 44, the control device 82 receives the paper splicing portion passage signal from the second paper splicing portion detection sensor 92. The first pressure adjusting device 81 reduces the pressure applied to the core paper (core B) by the upper and lower step rolls 44 and 45 to the pressure before the increase, and the second pressure adjusting device 86 applies pressure to the upper roll 44. The pressure applied to the core B and the back liner C by the pressure belt 43 is reduced to the pressure before the increase.

  As shown in FIG. 4A, the rear end portion of the old core paper B11 and the front end portion of the new core paper B21 are connected by a double-sided adhesive tape T to form a paper splice portion B3. An aluminum tape T1 serving as a detection unit is affixed and fixed downstream in the flow direction from B3, and each of the paper splice detection sensors 91 and 92 detects the aluminum tape T1, thereby detecting the paper splice B3. To detect. In this case, each of the paper splice detection sensors 91 and 92 is a magnetic sensor that detects the aluminum tape T1 as a metal member, but is not limited to this configuration. For example, an ultrasonic sensor that detects the paper splice B3 may be used.

  Here, in the single facer 25, the pressure adjustment control for the core paper (middle core B) of the upper and lower step rolls 44 and 45 by the first pressure adjustment device 81 and the upper stage by the second pressure adjustment device 86. The pressure adjustment control for the core 44 and the back liner C of the roll 44 and the pressure belt 43 will be described in detail.

  6 and 7, when the splicer 21a completes the paper splicing operation and the paper splicing section B3 is sent to the single facer 25, the first paper splicing is performed at time t1. The part detection sensor 91 detects this paper splicing part B3. When the control device 82 receives the paper splicing signal from the first paper splicing portion detection sensor 91, the control device 82 operates the first pressure adjusting device 81 to pressurize the core paper (middle core B) by the upper and lower corrugated rolls 44 and 45. Is increased to a predetermined pressure P2 at time t2. When the control device 82 receives the paper splicing signal from the first paper splicing portion detection sensor 91, the control device 82 operates the second pressure adjusting device 86, and the core B and the back liner by the upper roll 44 and the pressure belt 43. The pressurizing force of C is increased, and becomes a predetermined pressurizing force P12 at time t2.

  At time t2, when the pressure applied by the upper and lower step rolls 44 and 45 is increased to a predetermined pressure P2, the paper splicing portion B3 reaches the upper and lower step rolls 44 and 45 at a predetermined timing. The waveform is processed over time tb. At this time, since the pressurizing force of the upper and lower corrugated rolls 44 and 45 is set large, the upper and lower corrugated rolls 44 and 45 process the core paper in the vicinity of the paper splicing portion B3 and the paper splicing portion B3. Can be heated properly.

  After the corrugated portion B3 is corrugated by the upper and lower corrugated rolls 44 and 45 and glued to each top, the corrugated portion B3 of the core B is overlapped with the back liner C, and the pressure belt 43 and the upper corrugated roll 44 To the nip. The pressure applied by the upper roll 44 and the pressure belt 43 is increased to a predetermined pressure P12 at time t2, and when the paper splicing portion B3 reaches the nip portion between the pressure belt 43 and the upper roll 44, Pressed over time td. At this time, since the pressing force between the pressure belt 43 and the upper roll 44 is set large, the pressure belt 43 and the upper roll 44 press the paper splicing portion B3 and the back liner C of the core B. Can be heated properly. That is, the center core B (the paper splicing part B3) and the back liner C receive an appropriate amount of heat from the pressure belt 43 and the upper roll 44, so that the glue is solidified and the both are properly bonded together. it can.

  At time t3, when the second paper splicing portion detection sensor 92 detects the paper splicing portion B3 in the single-sided cardboard sheet D, the control device 82 receives a paper splicing passage detection signal from the second paper splicing portion detection sensor 92, and The first pressure adjusting device 81 is operated to reduce the pressing force of the core paper (core B) by the upper and lower step rolls 44 and 45 and the second pressure adjusting device 86 is operated to press the upper roll 44 and pressurize. The pressure applied to the core B and the back liner C by the belt 43 is reduced. At this time, the control device 82 controls the pressurizing force adjusting devices 81, 86, and the pressurizing force of the core paper (core B) by the upper and lower corrugated rolls 44, 45, the pressurizing belt 43, and the upper corrugated roll 44. The pressurizing force of the core B and the back liner C is gradually decreased, and at time t4, the predetermined pressurizing pressures P1 and P11, that is, the pressurizing force before time t1, are reached.

  Thus, in the single facer of the second embodiment, the first paper joint detection sensor 91 for detecting the paper joint B3 is provided upstream of the upper and lower corrugated rolls 44 and 45 in the flow direction of the core paper, When the paper splicing signal is input from the first paper splicing portion detection sensor 91, the control device 82 increases the pressurizing force by the first pressurizing pressure adjusting device 81 and the second pressurizing pressure adjusting device 86. Accordingly, when the core paper splicing portion B3 reaches the meshing portion of the upper and lower step rolls 44 and 45 and the nip portion between the upper roll 44 and the pressure belt 43, the pressure force between the two has already increased. The increase in the pressurizing force in the corrugated rolls 44 and 45 and the pressurizing belt 43 is not delayed, and the upper and lower corrugated rolls 44 and 45 and the pressurizing belt 43 pressurize the splicing portion B3 of the core paper with an appropriate pressurizing force. Can be heated.

  In the single facer according to the second embodiment, when a paper splice portion passing signal is input when the splice portion of the core paper passes through the nip portion between the pressure belt 43 and the upper roll 44, the first pressure adjusting device 81 and The applied pressure is reduced to the pressure before the increase by the second applied pressure adjusting device 86. Therefore, when the paper splicing signal is input, the control device 82 increases the pressurizing force by the pressurizing force adjusting devices 81 and 86, and when the paper splicing portion passage signal is input, the pressurizing force adjusting devices 81 and 86 are supplied. The pressure is reduced by this. For this reason, the upper and lower corrugated rolls 44 and 45 and the pressure belt 43 are increased in the minimum area that requires a large pressing force for the paper splicing portion, and the maximum processing of the core paper is performed. By keeping the area to the minimum necessary, the load on the upper and lower step rolls 44 and 45 and the pressure belt 43 can be reduced and the durability can be improved.

  In the single facer of the second embodiment, a second paper splicing portion detection sensor 92 for detecting the paper splicing portion B3 is provided downstream of the nip portion between the pressure belt 43 and the upper roll 44 in the flow direction of the core paper. When the paper splice portion passing signal is input from the second splice portion detection sensor 92, the device 82 reduces the pressure applied by the pressure adjustment devices 81 and 86 to the pressure before the increase. Therefore, the use of the second paper joint detection sensor 92 can appropriately detect that the paper joint B3 has passed through the nip portion between the pressure belt 43 and the upper roll 44, so that the upper and lower corrugated rolls 44, 45 can be detected. In addition, the reliability of the pressure adjustment control in the pressure belt 43 can be improved.

  In the single facer of the second embodiment, an aluminum tape T1 as a detection unit is attached and fixed to a splicing portion of the core paper, and the paper splicing portion detection sensors 91 and 92 detect the aluminum tape T1 to detect the paper. A joint has been detected. Therefore, the reliability of the pressure adjustment control in the upper and lower step rolls 44 and 45 and the pressure belt 43 can be improved.

  In the second embodiment, the pressure applied by the first pressure adjusting device 81 and the second pressure adjusting device 86 is increased by the paper splicing signal from the first paper splicing portion detection sensor 91, and the second paper splicing portion is increased. The pressure applied by the first pressure adjusting device 81 and the second pressure adjusting device 86 is decreased to the pressure before the increase by the paper splice portion passing signal from the detection sensor 92. However, the present invention is not limited to this configuration. Absent. For example, a third paper splice detection sensor that detects the paper splice B3 is provided between the meshing portion of the upper and lower corrugated rolls 44 and 45 and the nip portion between the pressure belt 43 and the upper roll 44, and the first paper splice is provided. The pressure applied by the first pressure adjusting device 81 is increased by the paper splicing signal from the paper detection sensor 91, and the pressure applied by the first pressure adjusting device 81 is decreased by the paper splicing signal from the third paper splicing detection sensor. At the same time, the pressurizing force by the second pressurizing adjustment device 86 may be increased, and the pressurizing force by the second pressurizing force adjusting device 86 may be decreased by the paper splice portion passage signal from the second paper splice portion detection sensor 92. .

  In the second embodiment, a first paper splicing portion detection sensor 91 for detecting a paper splicing portion is provided on the upstream side of the upper and lower corrugated rolls 44 and 45, and the control device 82 includes the first paper splicing portion detection sensor. When a paper splicing signal is input from 91, the pressurizing force is increased by the pressurizing force adjusting devices 81 and 83, but the present invention is not limited to this configuration. For example, the control device 82 calculates the timing at which the paper splicing portion reaches the first pressurizing force adjusting device 81, and increases the pressurizing force by the first pressurizing pressure adjusting device 81 according to the arrival timing of the paper splicing portion. It may be. Further, the control device 82 calculates the timing at which the paper splicing portion reaches the second pressurizing force adjusting device 86, and increases the pressurizing force by the second pressurizing pressure adjusting device 86 in accordance with the paper splicing portion reaching timing. May be. In this case, it is possible to prevent an increase in cost by adding no additional sensor or the like.

  Moreover, in each Example mentioned above, it is good for the control apparatus 82 to increase a pressurization force simultaneously with the 1st pressurization pressure adjustment apparatus 81 and the 2nd pressurization pressure adjustment apparatus 86. FIG. In this case, a desired pressure can be applied to the paper joint without missing the paper joint. On the other hand, the controller 82 may increase the applied pressure at different times by the first applied pressure adjusting device 81 and the second applied pressure adjusting device 86. In this case, a desired pressure can be applied to the paper splicing portion without missing the paper splicing portion, and the overload can be prevented by the pressure belt 43. Preferably, it is preferable to increase the pressure of the pressure belt 43 after a predetermined time (for example, about 3 seconds) after increasing the pressure of the upper and lower rolls 44 and 45.

10 Corrugating machine (corrugated cardboard sheet manufacturing equipment)
11 Single facer 12 Double facer 21 Mill roll stand 21a Splicer (paper splicer)
22 Preheater 23 Mill roll stand 24 Preheater 25 Single facer 26 Bridge 31 Mill roll stand 32 Preheater 33 Glue machine 34 Double facer 35 Rotary shear 36 Slitter scorer 37 Cut-off 38 Stacker 43 Pressure belt 44 Upper roll 45 Lower roll 48 Gluing device 81 First pressure adjusting device 82 Control device 86 Second pressure adjusting device 91 First splice detection sensor (first sensor)
92 Second seam detection sensor (second sensor)
A Front liner (first liner)
B Middle core B1, B2 Roll paper B11, B21 Core paper B3 Paper splicing part C Back liner (second liner)
D Single-sided cardboard sheet E Double-sided cardboard sheet

Claims (17)

Upper and lower corrugated rolls having corrugated outer peripheral surfaces that mesh with each other and capable of corrugating the core paper and being heatable,
A gluing device for applying a paste to the top of the corrugated core paper;
A pressure belt that pressurizes the core paper and liner after pasting together with any one of the upper and lower corrugated rolls and heats and joins them;
A first pressure adjusting device capable of adjusting the pressure applied to corrugated core paper by the upper and lower corrugated rolls;
A second pressure adjusting device capable of adjusting the pressure applied to the core paper and the liner by any one of the upper and lower corrugated rolls and the pressure belt;
The pressurizing force of the core paper by the upper and lower corrugated rolls is increased by the first pressurizing adjustment device with respect to the splicing portion of the core paper, and the corrugated roll and the pressure belt are increased by the second pressurizing control device. A controller for increasing the pressure applied to the core paper and the liner by:
Single facer characterized by comprising. Upper and lower corrugated rolls having corrugated outer peripheral surfaces that mesh with each other and capable of corrugating the core paper and being heatable,
A gluing device for applying a paste to the top of the corrugated core paper;
A pressure belt that is wound around a plurality of heated rolls and pressurizes and pastes the core paper and the liner together with any one of the upper and lower corrugated rolls; and
A first pressure adjusting device capable of adjusting the pressure applied to corrugated core paper by the upper and lower corrugated rolls;
A second pressure adjusting device capable of adjusting the pressure applied to the core paper and the liner by any one of the upper and lower corrugated rolls and the pressure belt;
The pressurizing force of the core paper by the upper and lower corrugated rolls is increased by the first pressurizing adjustment device with respect to the splicing portion of the core paper, and the corrugated roll and the pressure belt are increased by the second pressurizing control device. A controller for increasing the pressure applied to the core paper and the liner by:
Equipped with a,
The control device simultaneously increases the pressurizing force by the first pressurizing pressure adjusting device and the second pressurizing pressure adjusting device based on a splicing signal obtained by splicing the core paper.
Single facer characterized by that. The control device according to claim 1 or 2, characterized in that increasing the pressure by the first pressure regulator and the second pressure regulating device based on a paper splicing signal the splicing of the core sheet Single facer as described in. The control device claims, characterized in that to increase at different times of the pressure by the core paper of the web splicing was based on the paper splicing signal first pressure regulator and the second pressure regulating device The single facer according to 1 . A splicing device that performs a splicing process between the old core paper and the new core paper, and the control device increases the pressurizing force by the first pressure adjusting device based on a splicing signal related to the splicing operation. The single facer according to claim 1 , wherein the single facer is a single facer. A first sensor for detecting the paper splicing portion is provided upstream of the upper and lower corrugated rolls in the flow direction of the core paper, and the control device receives the paper splicing signal from the first sensor, The single facer according to claim 1, wherein the pressurizing force is increased by the first pressurizing force adjusting device.   The control device calculates a timing at which the paper splicing portion reaches the first pressurizing force adjusting device, and increases the pressurizing force by the first pressurizing pressure adjusting device according to the paper splicing portion arrival timing. The single facer according to any one of claims 1 to 4. A splicing device that performs a splicing process between the old core paper and the new core paper, and the control device increases the pressurizing force by the second pressure adjusting device based on a splicing signal related to the splicing operation. The single facer according to claim 1 , wherein the single facer is a single facer. A first sensor for detecting the paper splicing portion is provided upstream of the upper and lower corrugated rolls in the flow direction of the core paper, and the control device receives the paper splicing signal from the first sensor, The single facer according to any one of claims 1 to 4, wherein the pressurizing force is increased by the second pressurizing pressure adjusting device.   The control device calculates a timing at which the paper splicing portion reaches the second pressurizing pressure adjusting device, and increases the pressurizing force by the second pressurizing pressure adjusting device according to the paper splicing portion arrival timing. The single facer according to any one of claims 1 to 4.   The pressure belt is an endless belt that is wound around and supported by a pair of rolls, and the second pressure adjusting device moves the at least one of the pair of rollers in a direction away from the pressure. The single facer according to claim 1, wherein the single facer is increased.   When the paper splicing section passage signal is input to the control device when the splicing section of the core paper has passed through the nip portion between the corrugated roll and the pressure belt, the first pressurizing adjustment device and the second pressurizing device are provided. The single facer according to any one of claims 1 to 11, wherein the applied pressure is reduced to a pressure before the increase by the applied pressure adjusting device.   A second sensor for detecting the paper splicing portion is provided downstream of the nip portion between the corrugated roll and the pressure belt in the flow direction of the core paper, and the control device receives the paper splicing from the second sensor. 13. The single facer according to claim 12, wherein when a part passage signal is input, the first pressurizing pressure adjusting device and the second pressurizing pressure adjusting device reduce the pressurizing force to a pressure before the increase.   14. The single paper according to claim 6, wherein the core paper has a detection unit fixed to a paper splicing unit, and the sensor detects the paper splicing unit by detecting the detection unit. Facer. A single facer for producing a single-sided cardboard sheet by laminating a second liner to corrugated core paper;
A double facer for producing a double-sided cardboard sheet by laminating a first liner on the core paper side of the single-sided cardboard sheet produced by the single facer;
In a cardboard sheet manufacturing apparatus comprising:
The single facer according to any one of claims 1 to 14 is applied as the single facer.
An apparatus for producing a corrugated cardboard sheet. A process of splicing with a splicer;
Detecting the paper splice, and
Increasing the pressurizing force of the upper and lower corrugated rolls and the pressure belt based on the detection of the paper splice, and
A method for producing a corrugated cardboard sheet, comprising:   The method for producing a corrugated cardboard sheet according to claim 16, further comprising a step of reducing the pressure applied to the upper and lower corrugated rolls and the pressure belt after the paper splicing portion has passed the pressure belt.

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