Single Facer

Abstract

To provide a single facer that can reduce bonding failure by shortening an area that is not glued in core paper on the rear side of a paper joining part when the paper joining part of the core paper passes between a corrugating roll and a gluing roll.SOLUTION: A gluing device for single facer of the invention includes: a pair of corrugating rolls; a gluing roll 54; a doctor roll 56 that slides and contacts with the gluing roll to adjust the amount of glue adhering to the surface of the gluing roll; and a doctor roll drive motor 78 that rotates the doctor roll. This gluing device is further equipped with: a gap adjusting motor 68 for adjusting the gap between the gluing roll and the doctor roll by moving the doctor roll away from and contacting the gluing roll; and a single facer controller 92 that performs gap correction control and / or speed correction control so that the film thickness of the glue adhering to the surface of the gluing roll becomes thicker when the paper joining part of the core paper passes through the gluing position between an upper corrugating roll 4 and the gluing roll.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a single facer for producing single-faced corrugated board, and more particularly to a single facer having an improved gluing device. [Background technology]

[0002] In a single facer, the corrugation is formed by passing the corrugation paper between a pair of corrugation rolls, and then the corrugation paper is passed between a gluing roll with glue on its surface and the corrugation roll to apply glue to the corrugation tops of the corrugation paper. The gluing roll is pressed against the corrugation roll with a desired pressing force. After gluing, the corrugation paper and the liner paper are overlapped and passed between the corrugation roll and the press roll to bond them together, producing single-faced corrugated paper.

[0003] Meanwhile, the core paper is unwound from the roll of base paper upstream of the single facer, and the rear end of the old order base paper is spliced ​​to the front end of the new order base paper by double-sided tape in the splicer. This spliced ​​part is more than twice as thick as the core paper, so there is a step between the front and rear core papers. When the spliced ​​part is forcibly passed between the gluing roll and the corrugating roll, the gluing roll retreats from the corrugating roll, which is called the "rebound phenomenon." When this rebound phenomenon occurs, glue is not applied to the corrugated top of the core paper (the new order core paper behind the splicing part) that passed between the gluing roll and the corrugating roll while the gluing roll is retreating, and a bonding failure occurs in which the liner paper cannot be bonded to the core paper. And the faster the production speed (the speed of the core paper), the greater the impact on the gluing roll when passing through the splicing part, making it easier for the gluing roll to retreat, and more core paper passes while the gluing roll is retreating, so the bonding failure area becomes longer.

[0004] Patent Document 1 describes a single facer in which the pressure of the glue roll against the core paper (pressing force toward the corrugated roll) is set higher than the normal pressure when the spliced ​​portion passes between the glue roll and the corrugated roll in order to suppress the occurrence of the rebound phenomenon described above (see paragraph 0009). Here, the pressure of the glue roll when passing through the spliced ​​portion is set to a pressure that minimizes the rebound phenomenon, so that the spliced ​​portion and the core paper immediately thereafter are not crushed and deteriorated or torn, so that the glue roll and the glueing device are not mechanically damaged when pushed back by the spliced ​​portion, and so that the mesh on the surface of the glue roll is not damaged when the core paper scrapes off the glue from the surface of the glue roll (see paragraph 0016). It is described that when the spliced ​​portion passes between the gluing roll and the corrugated roll while maintaining this pressing force, the gluing roll temporarily retreats, creating an area at the top of the corrugated core paper where glue is not applied temporarily, but since the gluing roll immediately returns to its original position, the area where glue is not applied falls within the range of the defective spliced ​​portion that is cut and removed in the downstream process (see paragraph 0021). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-192636 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the single facer of the above-mentioned Patent Document 1, the pressing force of the gluing roll when passing through the paper splice portion cannot be set high enough to completely prevent the gluing roll from moving backward, in order to prevent the core paper from tearing and the gluing roll from being damaged. Therefore, the gluing roll moves backward temporarily, and there still remain areas where glue is not applied and bonding is poor.

[0007] Here, Patent Document 1 does not mention the problems that occur when the defective lamination part is transported from the single facer to the downstream cutting and removal process. That is, in the corrugating machine, downstream of the single facer, there is provided a double facer that creates a double-sided corrugated sheet by laminating a front liner to a single-sided corrugated sheet, a cutter that cuts the double-sided corrugated sheet in the flow direction, and the like, and downstream of the cutter, there is provided a deflector that discharges the defective part cut by the cutter out of the line.

[0008] The areas of the corrugation paper that were not applied with glue in the single facer were not bonded to the back liner paper, so the corrugation could not be maintained, and the corrugation was not properly bonded to the front liner paper in the downstream double facer, causing the corrugation paper to float between the front and back liners, reducing its rigidity. This poorly bonded area with reduced rigidity could get caught on a processing tool such as a cutter cylinder while being conveyed toward the deflector, causing a jam. In order to prevent jamming, it is necessary to shorten the poorly bonded area with low rigidity as much as possible, but the above-mentioned method of increasing the pressing force is insufficient to prevent the glue roll from retracting, so the production speed (paper speed) had to be reduced to deal with the problem, reducing productivity.

[0009] The present invention has been made to solve the problems of the prior art described above, and aims to provide a single facer that can shorten the non-glued area of ​​the core paper behind the splice portion, thereby reducing bonding defects, without causing the core paper to tear or the gluing roll to be damaged or reducing productivity when the splice portion of the core paper passes between the corrugation roll and the gluing roll. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the present invention, which is a first invention, is a single facer for manufacturing single-faced corrugated paper, comprising a pair of corrugated rolls consisting of a first corrugated roll and a second corrugated roll, each of which has a corrugated step portion on its outer periphery, and corrugates the corrugated ... The gluing device has a lamination mechanism that bonds the supplied liner paper and the glued core paper together, and the gluing device further has a gap adjustment mechanism that moves the doctor roll away from the glue roll to adjust the gap between the glue roll and the doctor roll, and a control device that performs gap correction control by controlling the gap adjustment mechanism to temporarily widen the gap between the glue roll and the doctor roll so that the thickness of the glue adhering to the surface of the glue roll becomes thicker when the spliced ​​portion of the core paper spliced ​​by a splicer located upstream of the pair of corrugated rolls passes through the gluing position between the first corrugated roll and the glue roll. According to the present invention thus configured, the control device controls the gap adjustment mechanism by gap correction control to temporarily widen the gap between the glue roll and the doctor roll so that the thickness of the glue film adhering to the surface of the glue roll becomes thick when the spliced ​​portion of the core paper passes through the gluing position between the first stage roll and the glue roll, so that even if the glue roll retreats and the gap between the first stage roll and the glue roll widens when the spliced ​​portion passes, glue can be applied to the core paper behind the spliced ​​portion, reducing poor bonding between the core paper and the liner paper. Furthermore, according to the present invention, glue can be applied to the core paper with the glue roll retreated, so that the deterioration of the paper and damage to the glue roll caused by pressing the glue roll with excessive force, which was previously required to prevent the glue roll from retreating, can be prevented, and there is no risk of lowering the production speed and reducing productivity. Furthermore, according to the present invention, the doctor roll is moved toward and away from the glue roll to widen the gap between the glue roll and the doctor roll, so that the position of the glue roll can be maintained, and there is no risk of the gap between the first stage roll and the glue roll narrowing, which could lead to deterioration of the core paper or damage to the glue roll.

[0011] The present invention, which is the second invention, is a single facer for manufacturing single-faced corrugated cardboard, comprising a pair of corrugated rolls consisting of a first corrugation roll and a second corrugation roll, each of which has a corrugated step portion on its outer peripheral surface and forms a corrugated shape on the passing corrugated core paper, a gluing roll which is pressed against the first corrugation roll so as to apply glue to the corrugated top of the corrugated core paper formed by the pair of corrugated rolls, a doctor roll which slides against the gluing roll to adjust the amount of glue adhering to the surface of the glued roll, and a gluing device which includes a doctor roll drive mechanism for rotating the doctor roll, and a laminating mechanism which bonds the liner paper supplied to the first corrugated roll to the glued core paper, and the gluing device further comprises a control device which performs speed correction control by controlling the doctor roll drive mechanism to temporarily slow down the rotational speed of the doctor roll so that the thickness of the glue adhering to the surface of the glued roll becomes thicker when the spliced ​​portion of the core paper spliced ​​by a splicer located upstream of the pair of corrugated rolls passes through the gluing position between the first corrugation roll and the glue roll. According to the present invention thus configured, the control device controls the doctor roll drive mechanism by speed correction control to temporarily slow down the rotation speed of the doctor roll so that the thickness of the glue film adhering to the surface of the glue roll becomes thick when the spliced ​​portion of the core paper passes the gluing position between the first stage roll and the glue roll, so that even if the glue roll retreats when the spliced ​​portion passes and the gap between the first stage roll and the glue roll widens, glue can be applied to the core paper behind the spliced ​​portion, reducing poor bonding between the core paper and the liner paper. Furthermore, according to the present invention, glue can be applied with the glue roll retreated, so that deterioration of the paper and damage to the glue roll caused by pressing the glue roll with excessive force, which was previously required to prevent the glue roll from retreating, can be prevented, and there is no risk of lowering the production speed and reducing productivity. Furthermore, according to the present invention, the rotational speed of the doctor roll is adjusted to increase the difference in rotational speed between the glue roll and the doctor roll, so that the rotational speed of the glue roll can be maintained. As a result, there is no difference in rotational speed between the first stage roll and the glue roll, and the core paper can be transported stably.

[0012] The present invention, which is the third invention, is a single facer for manufacturing single-faced corrugated paper, comprising a pair of corrugated rolls consisting of a first corrugated roll and a second corrugated roll, each of which has a corrugated step on its outer periphery and forms a corrugated shape on the corrugated core paper passing through it, a gluing roll which is pressed against the first corrugated roll so as to apply glue to the corrugated top of the corrugated core paper formed by the pair of corrugated rolls, a doctor roll which comes into sliding contact with the gluing roll to adjust the amount of glue adhering to the surface of the gluing roll, and a doctor roll drive mechanism which rotates the doctor roll; and a gluing device which includes a laminating mechanism which laminates the liner paper supplied to the first corrugated roll and the glued core paper. The gluing device further comprises a gap adjustment mechanism which moves the doctor roll away from the gluing roll to adjust the gap between the gluing roll and the doctor roll, and a control device which performs gap correction control by controlling the gap adjustment mechanism to temporarily widen the gap between the gluing roll and the doctor roll so that the thickness of the glue adhering to the surface of the glue roll becomes thicker when the spliced ​​portion of the core paper spliced ​​by a splicer located upstream of the pair of corrugated rolls passes through the gluing position between the first corrugated roll and the gluing roll, and which controls the doctor roll drive mechanism to temporarily slow down the rotational speed of the doctor roll. According to the present invention thus configured, the control device performs gap correction control to temporarily widen the gap between the gluing roll and the doctor roll by controlling the gap adjustment mechanism and performs speed correction control to temporarily slow down the rotation speed of the doctor roll by controlling the doctor roll drive mechanism so that the thickness of the glue film adhering to the surface of the glue roll becomes thick when the spliced ​​portion of the core paper passes through the gluing position between the first stage roll and the glue roll, so that even if the glue roll retreats and the gap between the first stage roll and the glue roll widens when the spliced ​​portion passes through, glue can be applied to the core paper behind the spliced ​​portion, reducing poor bonding between the core paper and the liner paper. Furthermore, according to the present invention, glue can be applied to the core paper with the glue roll retreated, so that the deterioration of the paper and damage to the glue roll caused by pressing the glue roll with excessive force, which was previously required to prevent the glue roll from retreating, can be prevented, and there is no risk of lowering the production speed and reducing productivity. Furthermore, according to the present invention, the doctor roll is moved toward and away from the gluing roll to widen the gap between them, so the position of the gluing roll can be maintained, and there is no risk of the gap between the first stage roll and the gluing roll narrowing, which could lead to deterioration of the core paper or damage to the gluing roll.Furthermore, according to the present invention, the rotation speed of the doctor roll is adjusted to increase the difference in rotation speed between the gluing roll and the doctor roll, so the rotation speed of the gluing roll can be maintained, and as a result, there is no difference in rotation speed between the first stage roll and the gluing roll, allowing the core paper to be transported stably. In addition, according to the present invention, the control device performs both the gap correction control and the speed correction control, so the glue film thickness can be increased in a shorter control time, and the gap correction control and the speed correction control can be started after the spliced ​​portion is transported and reaches close to the gluing position. Therefore, according to the present invention, there is no risk of the glue adhesion amount (moisture content) increasing over a wide area in the core paper in front of the spliced ​​portion, causing the sheet to warp, or the glue consumption increasing, resulting in pressure on costs.

[0013] In the present invention, the control device preferably performs gap correction control and / or speed correction control so that the thicker the paper thickness of the new order core paper behind the paper splice section, the thicker the film thickness of the glue on the surface of the glue roll. In a single facer, the thicker the new-order core paper behind the splice part is, the larger the step at the splice part becomes, and the greater the impact on the gluing roll when passing through the splice part becomes, so the amount of retreat of the gluing roll becomes greater. Therefore, according to the present invention, the control device performs gap correction control and / or speed correction control so that the thicker the new-order core paper behind the splice part is, the thicker the glue film thickness becomes. Therefore, even if the amount of retreat of the gluing roll changes depending on the type of new-order core paper, glue can be appropriately applied to the new-order core paper behind the splice part.

[0014] In the present invention, the control device preferably performs gap correction control and / or speed correction control so that the thinner the paper thickness of the old order core paper at the front of the paper splice section, the thicker the film thickness of the glue on the surface of the glue roll. In a single facer, the pressure with which the gluing roll is pressed against the first corrugated roll is set to be smaller as the thickness of the corrugated paper is thinner in order to prevent deterioration or tearing of the corrugated paper passing between a pair of corrugated rolls. Therefore, the thinner the thickness of the old-order corrugated paper in front of the spliced ​​part, the smaller the pressing force of the gluing roll when passing through the spliced ​​part, and the greater the retreat amount of the gluing roll. Therefore, according to the present invention, the control device performs gap correction control and / or speed correction control so that the thinner the thickness of the old-order corrugated paper in front of the spliced ​​part, the thicker the glue film thickness becomes. Therefore, even if the retreat amount of the gluing roll changes depending on the type of the old-order corrugated paper, glue can be appropriately applied to the new-order corrugated paper in the rear of the spliced ​​part.

[0015] In the present invention, the gluing device preferably further comprises an operation panel having a display unit that displays a set value of the gap between the gluing roll and the doctor roll in the gap correction control, and an operation unit that allows an operator to change the set value. According to the present invention configured in this way, the gluing device is provided with an operation panel equipped with a display unit and an operation unit, so that the operator can adjust the amount of glue applied to the corrugation paper by operating the operation unit while comparing the quality of the completed cardboard sheet with the setting value displayed on the display unit of the operation panel. For example, if a gluing defect occurs near the spliced ​​part of the corrugation paper of a new order, the setting value of the gap correction control can be changed to increase the amount of increase in glue film thickness, thereby ensuring that glue is applied to the corrugation paper of the new order behind the spliced ​​part and reducing the gluing defect.

[0016] In the present invention, the gluing device preferably further comprises an operation panel having a display unit for displaying a set value of the rotation speed of the doctor roll in the speed correction control and an operation unit by which the operator can change the set value. According to the present invention configured as described above, the gluing device is provided with an operation panel having a display unit and an operation unit, so that the operator can adjust the amount of glue applied to the corrugation paper by operating the operation unit while comparing the quality of the completed cardboard sheet with the setting value displayed on the display unit of the operation panel. For example, if a gluing defect occurs near the spliced ​​part of the corrugation paper of a new order, the speed correction control setting can be changed to increase the amount of glue film thickness increase, thereby ensuring that glue is applied to the corrugation paper of the new order behind the spliced ​​part and reducing the gluing defect.

[0017] In the present invention, the control device preferably starts the gap correction control and / or the speed correction control before the spliced ​​portion of the corrugation medium conveyed from the splicing position of the splicer passes through the gluing position. In the present invention, there is a time lag between when the gap correction control and / or the speed correction control is started and when the thickness of the glue on the surface of the gluing roll becomes thick, and during that time the core paper is transported downstream. Therefore, according to the present invention, the control device starts the gap correction control and / or the speed correction control before the spliced ​​portion of the core paper transported from the splicing position of the splicer passes the gluing position, so that the glue film thickness on the surface of the glue roll can be reliably kept thick when the spliced ​​portion of the core paper passes the gluing position, and glue can be applied to the core paper behind the spliced ​​portion.

[0018] In the present invention, the control device preferably starts gap correction control and / or speed correction control when the splice portion of the core paper passes a point further upstream from the gluing position, the faster the speed of the core paper. In the present invention, there is a time lag between when the control device starts the gap correction control and / or the speed correction control and when the thickness of the glue on the surface of the gluing roll becomes thick, and the faster the speed of the core paper, the longer the distance the core paper is transported during that time lag. Therefore, according to the present invention, the faster the speed of the core paper, the more the control device starts the correction control when the spliced ​​portion of the core paper passes a point further upstream from the gluing position (a point closer to the splicing position of the splicer). This makes it possible to reliably keep the glue film thickness on the surface of the gluing roll thick when the spliced ​​portion of the core paper passes the gluing position, even if the speed of the core paper changes, and glue can be applied to the core paper behind the spliced ​​portion. Effect of the Invention

[0019] According to the single facer of the present invention, when the spliced ​​portion of the core paper passes between the corrugated roll and the gluing roll, the area of ​​the core paper that is not glued behind the spliced ​​portion can be shortened to reduce bonding defects without causing the core paper to tear or the gluing roll to be damaged, or reducing productivity. [Brief description of the drawings]

[0020] [Figure 1]1 is a schematic side view showing a single facer and corrugation splicer according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is an enlarged view of a main portion of a single facer according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a side view showing a paper splice portion of the core paper. [Figure 4] FIG. 2A is a front view showing a doctor roll drive mechanism of a single facer gluing device according to an embodiment of the present invention, and FIG. 2B is a partial side view seen from the right side. [Diagram 5] FIG. 2 is a diagram showing the electrical configuration of a single facer according to an embodiment of the present invention. [Figure 6] 1 is a diagram showing the relationship between the transport position of the splice portion and the glue film thickness in the correction control performed by a single facer control device of a single facer according to an embodiment of the present invention. [Figure 7] 1 is a table showing the "glue film thickness increase amount" in the correction control executed by a single facer control device of a single facer according to an embodiment of the present invention. [Figure 8] 1 is a table showing the "gap correction amount" in the gap correction control executed by a single facer control device for a single facer according to an embodiment of the present invention. [Figure 9] 1 is a table showing the "speed correction amount" in the speed correction control executed by a single facer control device for a single facer according to an embodiment of the present invention. [Figure 10] 11 is a table showing a "gap correction amount" in the gap correction control executed by a single facer control device for a single facer according to a first modified example of an embodiment of the present invention. [Figure 11] 13 is a table showing a "speed correction amount" in the speed correction control executed by a single facer control device for a single facer according to a second modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The single facer according to the embodiment of the present invention will be described with reference to the drawings. First, the single facer according to the embodiment of the present invention and the corrugated cardboard splicer for splicing the corrugated cardboard will be described with reference to Figs. 1 to 3. FIG. 1 is a schematic side view showing a single facer and a core paper splicer according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main portion of a single facer according to an embodiment of the present invention, and FIG. 3 is a side view showing a relay portion of the core paper.

[0022] As shown in Figures 1 and 2, a single facer 1 according to this embodiment is disposed on a base 2 fixed to a floor FL. The single facer 1 is provided with a pair of corrugated rolls consisting of an upper corrugated roll 4 and a lower corrugated roll 6 rotatably supported between a pair of main frames 3, 3 standing at a predetermined interval in the width direction intersecting with the sheet feeding direction. The center of rotation of the lower corrugated roll 6 is disposed directly below the center of rotation of the upper corrugated roll 4. Furthermore, a desired corrugated step portion 8 (see Figure 2) is formed on the outer circumferential surfaces of the upper corrugated roll 4 and the lower corrugated roll 6.

[0023] The single facer 1 is further provided with a gluing device 12 for gluing the tops of the corrugations of the corrugated medium 10 formed into a desired corrugation by the upper corrugation roll 4 and the lower corrugation roll 6. The details of this gluing device 12 will be described later.

[0024] The single facer 1 is further provided with two smooth rolls 14, 16 arranged at a desired interval on the outer peripheral surface of the upper corrugated roll 4 downstream of the meshing portion with the lower corrugated roll 6. The two smooth rolls 14, 16 are provided so as to be able to approach and move away from the outer peripheral surface of the upper corrugated roll 4, and are bonded together by contacting and pressing the corrugating medium 10 and the liner paper 18 wound around the outer peripheral surface of the upper corrugated roll 4 according to the paper quality, paper width, production speed, etc. of the single-faced corrugated cardboard sheet to be produced. In this way, the corrugating medium 10 and the liner paper 18 are bonded together to produce a continuous single-faced corrugated cardboard sheet 20.

[0025] Alternatively, these two smooth rolls 14, 16 may be brought as close as possible to the outer circumferential surface of the upper roll 4 without contacting it, and the core paper 10 and the liner paper 18 may be wound between the two smooth rolls 14, 16 so as to apply a desired tension to the outer circumferential surface of the upper roll 4, and the core paper 10 and the liner paper 18 may be bonded together by the action of this tension. Furthermore, instead of two smooth rolls, a shoe member or a belt press device may be used to bond the core paper 10 and the liner paper 18 together.

[0026] In addition, upstream of the meshing portion between the upper roll 4 and the lower roll 6, there is provided a core paper preheater 22 for heating the core paper 10 being supplied, and an idle roll 24 for winding the core paper 10 around the core paper preheater 22. Furthermore, upstream of the engagement portion of the smooth roll 14, which is arranged upstream of the upper roll 4 and the two smooth rolls 14, 16, there is a liner paper preheater 26 that heats the liner paper 18 being supplied, and an idle roll 28 that wraps the liner paper 18 around the liner paper preheater 26.

[0027] In this embodiment, the gluing device is provided on the side of the upper rolls as described above, but the gluing device may be provided on the side of the lower rolls. In this case, the arrangement of the related rolls is also upside down compared to the arrangement in this embodiment.

[0028] Next, the corrugated paper splicer will be described with reference to Fig. 1. On the upstream side of the single facer 1, a mill roll stand 30 for supplying the corrugated paper 10 to the single facer 1 and a corrugated paper splicer 32 for splicing the corrugated paper 10 supplied from the mill roll stand 30 are arranged. The mill roll stand 30 has a machine base 34 fixed to the floor FL, and two sets of chucking arms 36a, 36b are rotatably provided on the machine base 34. Rolled base paper 38a, 38b that will become the corrugated paper 10 are loaded on each of the chucking arms 36a, 36b. The splicer 32 includes introduction rolls 40a, 40b, a splice head 42 for splicing, guide rolls 44a, 44b, 44c, and a storage section 47 consisting of dancer rolls 46a, 46b, 46c. Fig. 5 shows a splicing position A of the corrugated paper 10. A discharge roll 48 is provided at the discharge section of the splicer 32, and the corrugated medium 10 is supplied from the discharge roll 48 to the single facer 1.

[0029] Here, the splicing of the core paper 10 by the core paper splicer 32 is performed when the type of core paper is changed between the old and new orders, or when the remaining amount of the base paper roll decreases during the production of the order and it is replaced with a new base paper roll. Here, the explanation will be mainly focused on the case where the core paper 10 is spliced ​​when the order is changed so that the type of core paper is changed between the old and new orders.

[0030] 3 shows a spliced ​​portion 50 spliced ​​by the core paper splicer 32. Here, the core paper 10a of the old order is at the front of the spliced ​​portion 50, and the core paper 10b of the new order is at the rear. In the spliced ​​portion 50, the core paper 10a at the front side and the core paper 10b at the rear side are adhered with double-sided tape, so the thickness of the spliced ​​portion 50 is greater than the sum of the thicknesses of the core paper 10a and the core paper 10b.

[0031] Next, the gluing device 12 will be described. 1, the sizing device 12 is located downstream of the meshing portion between the upper roll 4 and the lower roll 6 and upstream of the engagement portion between the upper roll 4 and the smoothing roll 14. The sizing device 12 is equipped with a sizing device frame 51, a paste pan 52 for storing paste, a paste roll 54 arranged so as to be immersed in the paste stored in the paste pan 52, and a doctor roll 56 that comes into sliding contact with the paste roll 54 to scrape and smooth the paste adhering to the surface of the paste roll 54. The paste roll 54 and the doctor roll 56 are supported by the paste application device frame 51 so as to be freely rotatable.

[0032] Furthermore, rollers 58a, 58b are provided below the gluing device 12, allowing the gluing device 12 to slide on the base 2. This allows the gluing device 12 to be moved toward and away from the upper roll 4 by a moving device 60, which will be described later. In the moving device 60, an actuator 60a is provided via a bracket 64 on an auxiliary frame 62 fixed to the side of the main frames 3, 3, and the tip of a rod 60b of the actuator 60a is joined to the gluing device 12 via a connector 66. The pressing force applied by the actuator 60a of the moving device 60 can be adjusted by a control valve (not shown).

[0033] The actuator 60a of the moving device 60 causes the gluing roll 54 of the gluing device 12 to contact the core paper 10 with an optimum pressing force for uniformly applying an appropriate amount of glue to the corrugated top of the core paper 10. The contact position between the gluing roll 54 and the upper corrugated roll 4 via the core paper 10 is the gluing position B (see FIG. 5).

[0034] 1, a base 65 fixed to the main frame 3 is provided facing the direction in which the gluing device 12 advances toward the upper roll 4. An eccentric cam 67 is provided in contact with both the base 65 and the gluing device 12. The eccentric cam 67 is rotated by a drive device (not shown) so that a desired gap can be formed between the gluing roll 54 and the upper roll 4. Generally, this gap is adjusted by the eccentric cam 67 so that it is the same as or slightly narrower than the thickness of the corrugation medium of the production order.

[0035] Alternatively, without forming a gap between the gluing roll 54 and the upper roll 4, the actuator 60a of the moving device 60 described above may be used to move the gluing roll 54 of the gluing device 12 forward toward the upper roll 4, and the desired pressing force may be used to bring the gluing roll 54 into contact with the upper roll 4 via the core paper 10. In this case, the base 65 and eccentric cam 67 described above do not need to be provided.

[0036] Next, a doctor roll drive mechanism for driving the doctor roll 56 of the gluing device 12 will be described with reference to Figures 4(a) and (b). Figure 4(a) is a front view showing the doctor roll drive mechanism of a single facer gluing device according to an embodiment of the present invention, and (b) is a partial side view seen from the right side. 4, the gluing device 12 is provided with a doctor roll drive motor 78 that drives the doctor roll 56. Timing pulleys 80a, 80b are fixed to the shaft of the doctor roll drive motor 78 and the doctor roll shaft 56a, respectively, and a timing belt 82 is wound around both the timing pulleys 80a, 80b. When the doctor roll drive motor 78 rotates, the doctor roll 56 rotates through the timing pulleys 80a, 80b and the timing belt 82 by the bearing 74 attached to the gluing device frame 51 via an eccentric housing 76, which will be described later. The rotation speed of the doctor roll drive motor 78 is variable, so that the rotation speed of the doctor roll 56 can be adjusted. During normal production, the rotational speed of the doctor roll 56 is set to about 50% of the rotational speed of the glue roll 54. The glue roll 54 rotates at the production speed (the speed of the liner paper 18).

[0037] Furthermore, the gluing device 12 is provided with a gap adjustment motor 68 that changes the axial center position C1 of the doctor roll shaft 56a to adjust the gap between the gluing roll 54 and the doctor roll 56 (i.e., to move the doctor roll 56 closer to or farther from the gluing roll 54). This gap adjustment motor 68 is connected to an adjustment shaft 70 that is rotatably supported on the gluing device frame 51, and an adjustment gear 72 that is disposed on the outer surface of the gluing device frame 51 is attached to this adjustment shaft 70.

[0038] Furthermore, an eccentric housing 76 is rotatably inserted into the gluing device frame 51 via a bearing 74 on the outer periphery of the doctor roll shaft 56a. A gear 76a is formed on the outer periphery of the eccentric housing 76, and this gear 76a meshes with the adjustment gear 72. An inner part 76b of the eccentric housing 76 is in sliding contact with the gluing device frame 51 and is rotatable within the gluing device frame 51. The gear 76a and inner part 76b of the eccentric housing 76 are circular, and the axial position C2 of the gear 76a and inner part 76b of the eccentric housing 76 is offset from the axial position C1 of the doctor roll shaft 56a rotatably attached to the eccentric housing 76.

[0039] With this configuration, when the gap adjustment motor 68 rotates, the eccentric housing 76 rotates via the adjustment shaft 70 and the adjustment gear 72, thereby moving the doctor roll shaft 56a and adjusting the gap between the glue roll 54 and the doctor roll 56. During normal production, the gap between the glue roll 54 and the doctor roll 56 is set to about 0.2 mm, but this can be adjusted according to the quality and thickness of the corrugating medium of the order.

[0040] Next, the "gap correction control" and "speed correction control" which are the correction controls performed by the single facer 1 according to this embodiment will be described. First, in the single facer 1 according to this embodiment, when the core paper 10 is spliced, the doctor roll 56 is moved in a direction away from the glue roll 54 to widen the gap between the glue roll 54 and the doctor roll 56 so that the glue film thickness on the surface of the glue roll 54 becomes thick when the glue splice portion 50 passes through the glue position B between the upper roll 4 and the glue roll 54 (this correction control is called "gap correction control"). In this way, by moving the doctor roll 56 side, the position of the glue roll 54 can be maintained, so there is no risk of the gap between the upper roll 4 and the glue roll 54 narrowing, causing deterioration of the core paper or damage to the glue roll.

[0041] Furthermore, in the single facer 1 according to this embodiment, in addition to the above-mentioned "gap correction control", when the splicing of the core paper 10 is performed, the rotation speed of the doctor roll 56 is slowed down to increase the difference in rotation speed between the glue roll 54 and the doctor roll 56 so that the glue film thickness on the surface of the glue roll 54 becomes thick when the spliced ​​portion 50 passes through the gluing position B (this is called "speed correction control"). At this time, the rotation speed of the glue roll 54 can be maintained by adjusting the rotation speed of the doctor roll 56, so that the core paper 10 can be stably transported between the upper roll 4 and the glue roll 54. Note that instead of controlling the doctor roll drive motor, a continuously variable transmission may be provided between the doctor roll drive motor and the doctor roll shaft, and the continuously variable transmission may be controlled to adjust the rotation speed of the doctor roll.

[0042] Next, the electrical configuration of the single facer according to the embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a configuration diagram showing the electrical configuration of the single facer according to the embodiment of the present invention. 5, a pulse generator 90 is attached to the motor that drives the upper and lower rolls 4, 6. The speed of the corrugating medium 10 and the position of the splice portion 50 are calculated based on a pulse signal from the pulse generator 90.

[0043] Since the rotational speed of the upper and lower corrugation rolls 4, 6 corresponds to the speed of the liner paper 18 (= production speed), the speed of the corrugation paper 10 is calculated by multiplying the speed of the liner paper 18 in response to the pulse signal from the pulse generator 90 by the corrugation rate (the amount of corrugation paper used relative to the liner paper per unit length).

[0044] The position of the spliced ​​portion 50 is determined by calculating the distance the spliced ​​portion 50 has been transported from the splicing position A of the splicer 32. Specifically, the pulse signal is counted from the time splicing is performed by the splicer 32, and the amount of liner paper 18 fed out according to the counted number of pulses is multiplied by the above-mentioned stage rate to calculate the amount of core paper 10 fed out. Note that instead of calculating the transport distance of the spliced ​​portion 50, a detector for detecting the spliced ​​portion may be provided between the splicer and the meshing portion of the upper and lower stage rolls, and the position of the spliced ​​portion may be detected by this detector.

[0045] The above-mentioned correction control (gap correction control and speed correction control) is performed by the single facer control device 92 that controls the single facer 1 every time the splicer 32 splices the corrugation paper 10 . The single facer control device 92 receives order information, including information on the corrugating medium 10, from a corrugator overall control device 94 that controls the entire corrugator (the entire cardboard manufacturing device). The single facer controller 92 receives a splice signal from the corrugation splicer 32 . The single facer control device 92 receives a pulse signal from the pulse generator 90, and calculates the speed of the corrugation paper 10 and the transport distance of the splice portion 50 as described above.

[0046] The single facer control device 92 is provided with a memory 96 from which various setting values ​​and calculation formulas are read out. An operation panel 98 that can be operated by an operator is connected to the single facer control device 92. The operation panel 98 is a touch panel type, and various setting values ​​are displayed on the screen, so that the operator can change the setting values ​​by operating the operation panel 98. The changed setting values ​​are stored in the memory 96.

[0047] The single facer control device 92 sends a gap correction command to the gap adjustment motor 68 described above to adjust the gap between the doctor roll 56 and the gluing roll 54. Furthermore, the single facer control device 92 sends a speed correction command to the doctor roll drive motor 78 to adjust the rotation speed of the doctor roll 56.

[0048] Next, the relationship between the transport position of the splice portion and the glue film thickness in the correction control (gap correction control and speed correction control) performed by the single facer control device of the single facer according to the embodiment will be described with reference to Fig. 6. Fig. 6 is a diagram showing the relationship between the transport position of the splice portion and the glue film thickness in the correction control performed by the single facer control device of the single facer according to the embodiment of the present invention.

[0049] As shown in Fig. 6, first, in order to perform correction control, the single facer control device 92 calculates the transport distance of the spliced ​​portion 50 from the time when the core paper 10 is spliced ​​by the splicer 32 to the start of correction control (hereinafter referred to as the "correction control start distance"), and the transport distance of the spliced ​​portion 50 from the time when splicing is performed to the end of correction control (hereinafter referred to as the "correction control end distance"). The calculation of the "correction control start distance" and the "correction control end distance" are performed for "gap correction control" and "speed correction control", respectively, each time splicing of the core paper 10 is performed.

[0050] The single facer control device 92 starts the correction control when the conveying distance of the splice portion 50 coincides with the "correction control start distance." When the correction control starts, the thickness of the glue film on the surface of the glue roll 54 gradually increases, and then reaches the set thick glue film thickness. In addition, the single facer control device 92 ends the correction control when the conveying distance of the splice portion 50 coincides with the "correction control end distance." When the correction control ends, the glue film thickness on the surface of the glue roll 54 gradually becomes thinner, and then becomes the glue film thickness according to the new order. In order to calculate these "corrected control start distance" and "corrected control end distance", the "glue film thickness increase range", "glue film thickness increase amount", "gap correction amount", and "speed correction amount" described below are set.

[0051] Next, as shown in FIG. 6, the range in which the glue film thickness is increased before and after the splice part 50 (hereinafter referred to as the "glue film thickness increase range") is set to a range that takes into consideration the tracking accuracy of the splice part 50. Here, by setting the "glue film thickness increase range" with a width before and after the splice part 50, it is possible to reliably keep the glue film thick when the splice part 50 reaches the gluing position B. Here, as an example, a range of 8 m before the splice part 50 and 8 m after the splice part 50 is set, totaling 16 m. The length of the splice part 50 (the part where the old and new core paper and double-sided tape overlap) is about 50 mm. The set value of this "glue film thickness increase range" is displayed on the operation panel 98 and can be changed by the operator.

[0052] Next, the "glue film thickness increment", "gap correction amount" and "speed correction amount" in the correction control (gap correction control and speed correction control) executed by the single facer control device will be described with reference to Figures 7 to 9. Figure 7 is a table showing the "glue film thickness increment" in the correction control (gap correction control and speed correction control) executed by the single facer control device of a single facer according to an embodiment of the present invention, Figure 8 is a table showing the "gap correction amount" in the gap correction control executed by the single facer control device of a single facer according to an embodiment of the present invention, and Figure 9 is a table showing the "speed correction amount" in the speed correction control executed by the single facer control device of a single facer according to an embodiment of the present invention.

[0053] First, the "glue film thickness increase amount" will be explained with reference to Fig. 7. The amount by which the glue film thickness is increased when the spliced ​​part 50 passes (hereinafter referred to as "glue film thickness increase amount") is set in consideration of the actual measured value of the retreat amount of the glue roll, which was previously tested, and the time required for correction control. Here, the faster the speed of the core paper 10, the greater the impact on the glue roll 54 when the spliced ​​part 50 passes, and therefore the greater the retreat amount of the glue roll 54. Therefore, the "glue film thickness increase amount" is set assuming the case where the retreat amount of the glue roll 54 is the largest, that is, the case where the spliced ​​part 50 is transported at the maximum speed. As an embodiment, it is set assuming the maximum production speed (speed of the liner paper 18) of 300 m / min.

[0054] In addition, the thicker the new order core paper 10 is, the larger the step of the spliced ​​portion 50 becomes, and the greater the impact on the gluing roll 54 when the spliced ​​portion 50 passes, so that the amount of retreat of the gluing roll 54 becomes greater. Furthermore, the thinner the paper thickness of the old order core paper 10, the smaller the pressure with which the gluing roll 54 is pressed against the upper roll 4 is set to prevent deterioration of the core paper 10 or paper breakage, and therefore the greater the retreat amount of the gluing roll 54.

[0055] Therefore, as shown in FIG. 7, the thickness of the medium paper 10 of the old and new orders is divided into five stages (thin: basis weight (1 m 2 Weight per unit: ~120g / m 2 Fairly thin: 120-160g / m 2 Equivalent, normal: basis weight 160~180g / m 2 Fairly thick: 180-200g / m 2 Equivalent, thick: grammage 200g / m 2 The thickness of the corrugated paper 10 is divided into two groups (equivalent to the new order) and the amount of increase in the thickness of the adhesive layer is set according to the combination of the thicknesses of the corrugated paper 10 of the old and new orders.

[0056] Specifically, the thicker the paper thickness of the old order is and the thinner the paper thickness of the new order is, the smaller the retreat amount of the gluing roll 54 is, so the glue film thickness increase amount is set to a smaller value. Conversely, the thinner the paper thickness of the old order is and the thicker the paper thickness of the new order is, the larger the retreat amount of the gluing roll 54 is, so the glue film thickness increase amount is set to a larger value. As an example, when the paper thickness of the old order is thick and the paper thickness of the new order is thin, the actual measured retreat amount of the glue roll 54 is about 0.05 mm, so the glue film thickness increase amount is set to 0.05 mm (see the bottom of the leftmost column in the left table in Figure 7).

[0057] On the other hand, when the paper thickness of the old order is thin and the paper thickness of the new order is thick, the actual measured value of the retreat amount of the glue application roll 54 is about 0.2 mm, but the glue film thickness increase amount is set to 0.15 mm (see the top of the rightmost column in the left table of FIG. 7). This is because if the glue film thickness increase amount is set to 0.2 mm, the time required for correction control will be long, and there is a risk that the set glue film thickness increase amount will not be reached until the splice part 50 is transported and reaches the glue application position B (more precisely, until it enters the glue film thickness increase range). Therefore, the glue film thickness increase amount is set to be less than the actual measured value of the retreat amount of the glue application roll 54.

[0058] Next, the "gap correction amount" by the gap correction control will be described with reference to FIG. 7 and FIG. First, in this embodiment, the "gap correction amount" and the "speed correction amount" are set so that the sum of the glue thickness increase amount due to the gap correction control and the glue thickness increase amount due to the speed correction control is the above-mentioned set (total) glue thickness increase amount. That is, in this embodiment, by performing both the gap correction control and the speed correction control as the correction control, the total glue thickness increase amount is shared between the glue thickness increase amount due to the gap correction control and the glue thickness increase amount due to the speed correction control.

[0059] Next, in the gap correction control, since it is easy to imagine the relationship between the gap correction amount and the glue film thickness increase amount (gap correction amount ≒ glue film thickness increase amount), there is an advantage that the operator can easily adjust the glue film thickness. Therefore, if the set (total) glue thickness increase is small, the ratio of the glue thickness increase handled by the gap correction control to the total glue thickness increase is increased to make it easier to adjust the glue thickness. For example, if the paper thickness of the old order is thick and the paper thickness of the new order is thin, the set (total) glue thickness increase is small at 0.05 mm (see the bottom of the leftmost column in the table on the left of Fig. 7), so the glue thickness increase by the gap correction control is set to 0.05 mm (see the bottom of the leftmost column in the table on the top right of Fig. 7), and the glue thickness increase by the speed correction control is set to 0 (see the bottom of the leftmost column in the table on the bottom right of Fig. 7).

[0060] Then, based on the amount of glue thickness increase due to the set gap correction control, the amount of glue thickness increase is converted to the gap correction amount, assuming that the gap correction amount is approximately equal to the amount of glue thickness increase (ignoring any errors). Therefore, if the amount of glue thickness increase due to gap correction control is 0.05 mm (see the bottom of the leftmost column in the left table of Fig. 8), the "gap correction amount" is set to 0.05 mm (see the bottom of the leftmost column in the right table of Fig. 8).

[0061] Next, the "speed correction amount" by the speed correction control will be described with reference to FIG. 7 and FIG. The speed correction control has an advantage that the correction speed is faster than the gap correction control. Therefore, when the (total) set glue film thickness increase is large, the ratio of the glue film thickness increase handled by the speed correction control to the total glue film thickness increase is increased to shorten the total control time, so that the control can be started after the splice portion 50 reaches close to the gluing position B, and the range in which the glue adhesion amount increases in the corrugation paper 10 of the old order can be kept to a necessary minimum. For example, if the paper thickness of the old order is thin and the paper thickness of the new order is thick, the set glue thickness increase amount is 0.15 mm, which is large (see the top of the right-most column in the table on the left in Fig. 7), so the glue thickness increase amount by gap compensation control is set to 0.05 mm (see the top of the right-most column in the table on the top right in Fig. 7), and the glue thickness increase amount by speed compensation control is set to 0.1 mm (see the top of the right-most column in the table on the bottom right in Fig. 7).

[0062] Then, as shown in Fig. 9, the glue thickness increase is converted into a speed correction amount based on the set glue thickness increase due to the speed correction control. If the rotation speed of the doctor roll 56 is set to 75% (25% reduction) of the normal speed, the glue thickness increases by about 0.05 mm, as if the gap was widened by 0.05 mm (ignoring errors). Therefore, if the glue thickness increase due to the speed correction control is 0.1 mm (see the top of the rightmost column in the left table of Fig. 9), the speed correction amount is set to 50% of the normal speed (see the top of the rightmost column in the right table of Fig. 9).

[0063] The set values ​​of the "gap correction amount" and "speed correction amount" according to the paper thickness of the old and new orders described above are displayed on the operation panel 98 and can be changed by the operator.

[0064] Next, based on the above-mentioned set "glue film thickness increase range," "gap correction amount," and "speed correction amount," a method for calculating the "correction control start distance (the transport distance of the spliced ​​portion from the time of splicing to the start of correction control)" and the "correction control end distance (the transport distance of the spliced ​​portion from the time of splicing to the end of correction control)" shown in Figure 6 will be described.

[0065] First, a method for calculating the "corrected control start distance" will be described. The "corrected control start distance" is calculated from the following calculation formulas 1, 2, and 3. In these calculation formulas 1 to 3, "correction control" means "gap correction control" and "speed correction control", and "correction amount" means "gap correction amount" and "speed correction amount". Calculation formula for correction control start distance 1 Correction control start distance (m) = Distance of the core paper from the splicing position A of the splicer to the gluing position B of the single facer (m) - {Distance of the corrugating medium that passes from the start of correction control until the set correction amount is reached (m) + Range of increase in glue film thickness before the splice (m)} Compensation control start distance calculation formula 2 The distance (m) of the corrugating medium that passes from when the correction control starts until the set correction amount is reached = Time required for correction control (sec) x medium paper speed (m / sec) Compensation control start distance calculation formula 3 Time required for correction control (seconds) = correction amount (mm or %) ÷ correction speed (mm / second or % / second)

[0066] For calculation formula 1, the length of the core paper from the splicing position A of the splicer to the gluing position B of the single facer is known in advance. In this embodiment, it is 41 m. In addition, the range of increase in glue film thickness is 8 m both before and after the splice part in this embodiment. Regarding formula 2, the corrugation speed is calculated each time splicing is performed. The corrugation speed is calculated by multiplying the production speed (liner paper speed) by the flute run rate. In the calculation formula 3, the correction speed in the gap correction control is the moving speed of the doctor roll, which is 0.017 mm / sec in the embodiment. Also, the correction speed in the speed correction control is the speed at which the rotation speed of the doctor roll is changed, which is 25% / sec in the embodiment. This means that when the rotation speed during normal production is 100%, the rotation speed can be decelerated to 75% of the normal speed ratio in 1 second. Also, when the normal speed ratio is 75% (25% deceleration), the glue film thickness increases by about 0.05 mm.

[0067] Calculation formula for correction control end distance Compensation control end distance (m) = The distance (m) of the core paper transported from the splicing position A of the splicer to the gluing position B of the single facer + the range of glue film thickness increase behind the splice (m)

[0068] Next, a calculation example regarding the gap correction control will be described. <Condition> - Gap correction amount is 0.05mm (gap correction control increases glue thickness by 0.05mm) -Production speed during splicing (liner paper speed) is 300m / min, A flute (step ratio 1.6) <Calculation of correction control start distance> From formula 3, the time required for gap correction control is 0.05 mm ÷ 0.017 mm / sec ≒ 2.94 seconds. The speed of the corrugating medium is 300m / min x 1.6 = 480m / min = 8m / sec, so From calculation formula 2, the distance of the corrugating medium that is passed from the start of the gap correction control until the set correction amount is reached is 2.94 seconds x 8 m / sec = 23.5 m. Therefore, from calculation formula 1, the gap correction control start distance is 41m-(23.5m+8m)=9.5m. <Calculation of correction control end distance> The end distance of the gap correction control is 41m + 8m = 49m.

[0069] Next, a calculation example regarding the speed correction control will be described. <Condition> -Speed ​​correction amount is 50% of normal speed (glue film thickness increase amount by speed correction control is 0.1mm) -Production speed during splicing (liner paper speed) 300m / min, A flute (step ratio 1.6) <Calculation of correction control start distance> From formula 3, the time required for speed correction control is 50%÷25%=2 seconds. The speed of the corrugating medium is 300m / min x 1.6 = 480m / min = 8m / sec, so From formula 2, the distance of the corrugating medium that is passed from the start of the speed correction control until the set correction amount is reached is 2 seconds x 8 m / sec = 16 m. Therefore, from calculation formula 1, the correction control start distance for the speed correction control is 41m-(16m+8m)=17m. <Calculation of correction control end distance> The end distance of speed correction control is 41m + 8m = 49m.

[0070] In the above calculation example, gap correction control is started when the transport distance of the spliced ​​portion from the splice point reaches 9.5 m, and speed correction control is started when it reaches 17 m. By doing so, when the spliced ​​portion reaches the glue film thickness increase range 8 m before the gluing position B, the glue film thickness increase will be 0.15 mm (film thickness increase due to gap correction control: 0.05 mm + film thickness increase due to speed correction control: 0.1 mm). Thereafter, when the transport distance of the spliced ​​portion reaches 49 m, the gap correction control is terminated and the gap begins to be adjusted to a value corresponding to the new order core paper, and the speed correction control is terminated and the rotational speed of the doctor roll 56 begins to return to the speed during normal production. These calculation formulas are stored in the memory 96, and the calculated correction control start distance and correction control end distance are displayed on the operation panel 98.

[0071] Next, a flow of correction control executed by the single facer control device of the single facer according to this embodiment will be described. Here, the flow of correction control will be described assuming a case where paper splicing is performed when an order is changed such that the type of corrugating medium changes between the old and new orders. However, in this embodiment, it is also executed when splicing when the remaining amount of the base paper roll becomes low during the production of an order and the base paper roll is replaced with a new one. In this case, it is assumed that the same type of corrugation paper is used for the old and new orders, and the same control is executed.

[0072] <Condition> ·Old order core paper basis weight 120g / m 2 (equivalent to "thin" paper thickness) ·New order core paper basis weight 180g / m 2 (Equivalent to "normal" paper thickness) A flute (progression rate 1.6) -Production speed during splicing (liner paper speed) 300m / min - The transport distance of the core paper from the splicing position A of the splicer to the gluing position B of the single facer is 41m. - Increased glue thickness range: 8m before and after the paper splice Gap correction speed: 0.017mm / sec -Speed ​​correction speed: 25% / sec reduction in rotation speed compared to normal production speed

[0073] Correction control flow performed by the single facer control device 92 1. Produce the old order. The rotation speed of the doctor roll 56 is set to the rotation speed during normal production. The gap between the doctor roll 56 and the glue roll 54 is set to a value corresponding to the medium paper of the old order. 2. When the time for splicing approaches, the thickness and flute information of the new corrugator paper is received from the corrugator overall control device 94. 3. When the splicer 32 has spliced ​​the corrugation paper, a splice signal is received from the splicer 32.

[0074] 4. A pulse signal is received from a pulse generator 90 attached to the motor driving the upper and lower rolls, and the speed of the corrugating medium is measured by multiplying the corrugation rate. ·300m / sec×1.6=480m / min=8m / sec 5. The pulse signal is counted from the point when the splice signal is received, and the number of counted pulses is multiplied by the advance rate to measure the transport distance of the splice section (the amount of core paper fed out). 6. The memory is referenced and the gap correction amount and speed correction amount corresponding to the combination of the medium paper thicknesses of the old and new orders are read out. If the paper thickness of the old order is "thin" and the paper thickness of the new order is "normal", The gap compensation amount is 0.05 mm (see the top of the middle row in the table on the right in Fig. 8), and the speed compensation amount is 50% of the normal speed ratio (see the top of the middle row in the table on the right in Fig. 9).

[0075] 7. Based on the calculation formula stored in the memory 96, the correction control start distance and the correction control end distance are calculated for each of the gap correction control and the speed correction control. Gap correction control start distance = 41m - {(0.05mm ÷ 0.017mm / sec) × 8m / sec + 8m} ≒ 9.5m Speed ​​compensation control start distance =41m-{(50%÷25% / sec)×8m / sec+8m}≒17m End distance of gap correction control and speed correction control = 41m + 8m = 49m

[0076] 8. Regarding the gap correction control and the speed correction control, when the transport distance of the splice portion coincides with the correction control start distance, a correction start command is issued to the doctor roll drive motor 78 and the gap adjustment motor 68, respectively. The doctor roll drive motor 78 slows down the rotation speed of the doctor roll 56. The gap adjustment motor 68 moves the doctor roll 56 away from the glue application roll 54. 9. Regarding the gap correction control and the speed correction control, when the transport distance of the splice portion coincides with the correction control end distance, a correction end command is issued to the doctor roll drive motor 78 and the gap adjustment motor 68, respectively. The doctor roll drive motor 78 returns the doctor roll 56 to its normal production rotational speed. The gap adjustment motor 68 adjusts the gap to match the new order of corrugated paper. 10. Produce new orders. The spliced ​​portion is cut by a cutter located downstream of the single facer, and then discharged outside the corrugator line by a deflector.

[0077] Next, a single facer according to a first modified example and a second modified example of the embodiment of the present invention will be described with reference to Figures 10 and 11. Figure 10 is a table showing the "gap correction amount" in the gap correction control executed by the single facer control device of the single facer according to the first modified example of the embodiment of the present invention, and Figure 11 is a table showing the "speed correction amount" in the speed correction control executed by the single facer control device of the single facer according to the second modified example of the embodiment of the present invention.

[0078] In the embodiment of the present invention described above, both gap correction control and speed correction control are performed as correction controls, so that the total glue film thickness increase is shared between the glue film thickness increase due to gap correction control and the glue film thickness increase due to speed correction control. In the present invention, as a modification of the above-described embodiment, the "gap correction control" and the "speed correction control" may be performed independently as the correction control.

[0079] 11, in the single facer according to the first modified example, the “gap correction control” is performed alone as the correction control. In this case, the total film thickness increase amount is converted into the gap correction amount, which is displayed on the operation panel 98. 12, in the second modified example, the “speed correction control” is performed alone as the correction control. In this case, the total film thickness increase amount is converted into a speed correction amount, which is displayed on the operation panel 98.

[0080] In these first and second modified examples, the calculation method of the corrected control start distance and the corrected control end distance, and the corrected control flow are the same as those in the above-described embodiment.

[0081] In the single facers according to the present embodiment, the first modified example, and the second modified example described above, the correction control (gap correction control and / or speed correction control) by the single facer control device described above may be performed only when the speed of the core paper during splicing is fast. When the speed of the core paper is slow, the impact on the gluing roll when passing through the splicing section is small, so the amount of retreat of the gluing roll is small, and the length of the core paper passing while the gluing roll is retreating is also short, so the defective bonding portion is kept short. For example, by setting the correction control not to be performed when the production speed during splicing is less than 150 m / min, it is possible to prevent the consumption of glue from increasing more than necessary.

[0082] In the above-mentioned embodiment, the length of the defective lamination part near the paper splice of the new order corrugating paper was 65 mm on average in the conventional method, but 26 mm on average in the present invention, shortening the defective lamination part by 39 mm. As a result, the defective lamination part was prevented from getting caught by processing tools such as the cutter cylinder while being conveyed to the deflector, and jamming was prevented.

[0083] Next, the effects of the single facers according to the above-described embodiment, the first modified example, and the second modified example will be described. First, in the single facer 1 according to this embodiment and the first modified example, when the spliced ​​portion 50 of the core paper 10 passes through the gluing position B between the upper roll 4 and the gluing roll 54, the single facer control device 92 controls the gap adjustment motor 68 by "gap correction control" to temporarily widen the gap between the gluing roll and the doctor roll 56 so that the thickness of the glue adhering to the surface of the gluing roll 54 becomes thicker. Therefore, even if the glue roll 54 retreats when the spliced ​​portion 50 passes and the gap between the upper roll 4 and the glue roll 54 widens, glue can be applied to the core paper 10 behind the spliced ​​portion 50, thereby reducing poor bonding between the core paper 10 and the liner paper 48. According to this embodiment and the first modification, glue can be applied to the core paper 10 with the glue roll 54 retracted, so that the glue roll has been pressed with excessive force to prevent it from retracting in the past. However, this excessive force can prevent deterioration of the paper and damage to the glue roll, and there is no risk of lowering the production speed and reducing productivity. Furthermore, according to this embodiment and the first modification, the doctor roll 56 is moved toward and away from the glue roll 54 to widen the gap between the glue roll 54 and the doctor roll 56, so the position of the glue roll 54 can be maintained, and there is no risk of the gap between the upper roll 4 and the glue roll 54 narrowing, causing deterioration of the core paper and damage to the glue roll. Furthermore, according to this embodiment and the first modified example, it is possible to prevent a jam that previously occurred when a poorly bonded portion of a single-sided corrugated cardboard sheet got caught on a processing tool such as a cutter cylinder while being transported toward the deflector.

[0084] Next, in the single facer 1 according to this embodiment and the second modification, the single facer control device 92 controls the doctor roll drive motor 78 by "speed correction control" to temporarily slow down the rotation speed of the doctor roll 56 so that the thickness of the glue attached to the surface of the glue roll 54 becomes thick when the spliced ​​portion 50 of the core paper 10 passes through the gluing position B between the upper roll 4 and the glue roll 54. Therefore, even if the glue roll 54 retreats when the spliced ​​portion 50 passes and the gap between the upper roll 4 and the glue roll 54 widens, glue can be applied to the core paper 10 behind the spliced ​​portion 50, and poor bonding between the core paper 10 and the liner paper 18 can be reduced. Furthermore, according to this embodiment and the second modification, glue can be applied with the glue roll 54 retreated, so that the glue roll is pressed with excessive force in the past to prevent the glue roll from retreating. However, this prevents the deterioration of the paper and damage to the glue roll caused by pressing with excessive force, and there is no risk of lowering the production speed and reducing productivity. Furthermore, according to this embodiment and the second modified example, the rotational speed of the doctor roll 56 is adjusted to increase the difference in rotational speed between the glue roll 54 and the doctor roll 56, so that the rotational speed of the glue roll 54 can be maintained. As a result, there is no difference in rotational speed between the upper roll 4 and the glue roll 54, and the core paper 10 can be transported stably. Furthermore, according to this embodiment and the second modified example, it is possible to prevent a jam that previously occurred when a poorly bonded portion of a single-sided corrugated cardboard sheet got caught on a processing tool such as a cutter cylinder while being transported toward the deflector.

[0085] Furthermore, in the single facer 1 according to this embodiment, the single facer control device 92 performs both "gap correction control" and "speed correction control", so the glue film thickness can be increased in a shorter control time, and "gap correction control" and "speed correction control" can be started after the spliced ​​part 50 is transported and reaches close to the gluing position B. Therefore, according to this embodiment, there is no risk of the glue adhesion amount (moisture content) increasing over a wide area in the core paper in front of the spliced ​​part 50, causing the sheet to warp, or the glue consumption increasing, resulting in pressure on costs. [Explanation of symbols]

[0086] 1 Single Facer 4 Upper roll 6 Lower Roll 8 Waveform steps 10 Core paper 12 Gluing device 18 Liner Paper 20 Single-sided corrugated cardboard sheets 32 Cord Splicer 50 Paper splice 52 Gluten Bread 54 Glue roll 56 Doctor Roll 68 Gap adjustment motor 78 Doctor roll drive motor 90 Pulse Generator 92 Single facer control device 94 Corrugator overall control device 96 Memory 98 Operation Panel A Paper splicing position B Gluing position C1 Center position of doctor roll shaft C2 Eccentric housing axis position

Claims

1. A single facer for producing single-faced corrugated paper, comprising: A pair of corrugated rolls including a first roll and a second corrugated roll, each of which has a corrugated step portion on its outer circumferential surface and corrugates a passing corrugated medium; a gluing device including a gluing roll which is pressed against the first corrugation roll so as to apply glue to the corrugated tops of the corrugated corrugated medium formed by the pair of corrugation rolls, a doctor roll which comes into sliding contact with the gluing roll to adjust the amount of glue adhering to the surface of the gluing roll, and a doctor roll drive mechanism which rotates the doctor roll; a lamination mechanism for laminating the liner paper supplied to the first stage roll and the glued core paper, The gluing device further comprises a gap adjustment mechanism which moves the doctor roll toward and away from the gluing roll to adjust the gap between the gluing roll and the doctor roll, and a control device which performs gap correction control by controlling the gap adjustment mechanism to temporarily widen the gap between the gluing roll and the doctor roll so that the thickness of the glue adhering to the surface of the gluing roll becomes thicker when the spliced ​​portion of the core paper spliced ​​by a splicer located upstream of the pair of corrugated rolls passes through the gluing position between the first corrugated roll and the gluing roll.

2. A single facer for producing single-faced corrugated paper, comprising: A pair of corrugated rolls consisting of a first corrugated roll and a second corrugated roll, each of which has a corrugated stepped portion on its outer circumferential surface and corrugates the corrugated medium passing through the pair of corrugated rolls; a gluing device including a gluing roll which is pressed against the first corrugation roll so as to apply glue to the corrugated tops of the corrugated corrugated medium formed by the pair of corrugation rolls, a doctor roll which comes into sliding contact with the gluing roll to adjust the amount of glue adhering to the surface of the gluing roll, and a doctor roll drive mechanism which rotates the doctor roll; a lamination mechanism for laminating the liner paper supplied to the first stage roll and the glued core paper, The gluing device further comprises a control device which performs speed correction control by controlling the doctor roll drive mechanism to temporarily slow down the rotation speed of the doctor roll so that the thickness of the glue adhering to the surface of the glue roll becomes thicker when the spliced ​​portion of the core paper spliced ​​by the splicer located upstream of the pair of corrugated rolls passes through the gluing position between the first corrugated roll and the glueing roll.

3. A single facer for producing single-faced corrugated paper, comprising: A pair of corrugated rolls consisting of a first corrugated roll and a second corrugated roll, each of which has a corrugated stepped portion on its outer circumferential surface and corrugates the corrugated medium passing through the pair of corrugated rolls; a gluing device including a gluing roll which is pressed against the first corrugation roll so as to apply glue to the corrugated tops of the corrugated corrugated medium formed by the pair of corrugation rolls, a doctor roll which comes into sliding contact with the gluing roll to adjust the amount of glue adhering to the surface of the gluing roll, and a doctor roll drive mechanism which rotates the doctor roll; a lamination mechanism for laminating the liner paper supplied to the first stage roll and the glued core paper, The gluing device further comprises a gap adjustment mechanism for moving the doctor roll away from the gluing roll to adjust the gap between the gluing roll and the doctor roll, and a control device for controlling the gap adjustment mechanism to perform gap correction control to temporarily widen the gap between the gluing roll and the doctor roll so that the thickness of the glue adhering to the surface of the glue roll becomes thicker when the spliced ​​portion of the core paper spliced ​​by a splicer located upstream of the pair of corrugated rolls passes through the gluing position between the first corrugated roll and the gluing roll, and for controlling the doctor roll drive mechanism to perform speed correction control to temporarily slow down the rotational speed of the doctor roll.

4. A single facer as described in any one of claims 1 to 3, wherein the control device performs the gap correction control and / or the speed correction control so that the thicker the paper thickness of the new order core paper behind the paper splice section, the thicker the film thickness of the glue on the surface of the glue roll.

5. A single facer as described in any one of claims 1 to 4, wherein the control device performs the gap correction control and / or the speed correction control so that the thinner the paper thickness of the old order core paper in front of the paper splice section, the thicker the film thickness of the glue on the surface of the glue roll.

6. The single facer according to claim 1 or 3, wherein the gluing device further comprises an operation panel having a display unit that displays a set value of the gap between the gluing roll and the doctor roll in the gap correction control and an operation unit that allows an operator to change the set value.

7. The single facer according to claim 2 or 3, wherein the gluing device further comprises an operation panel having a display unit that displays a set value of the rotational speed of the doctor roll in the speed correction control and an operation unit that allows an operator to change the set value.

8. A single facer as described in any one of claims 1 to 3, wherein the control device starts the gap correction control and / or the speed correction control before the spliced ​​portion of the core paper transported from the splicing position of the splicer passes through the gluing position.

9. The single facer described in claim 8, wherein the control device starts the gap correction control and / or the speed correction control when the core paper splice portion passes a point further upstream from the gluing position, the faster the core paper speed.

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